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WO2001057449A1 - Constant temperature-humidity oven - Google Patents

Constant temperature-humidity oven Download PDF

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Publication number
WO2001057449A1
WO2001057449A1 PCT/KR2001/000152 KR0100152W WO0157449A1 WO 2001057449 A1 WO2001057449 A1 WO 2001057449A1 KR 0100152 W KR0100152 W KR 0100152W WO 0157449 A1 WO0157449 A1 WO 0157449A1
Authority
WO
WIPO (PCT)
Prior art keywords
refrigerant
controlling
evaporator
flow quantity
constant temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2001/000152
Other languages
French (fr)
Inventor
Jin-Euk Kim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to AU2001232393A priority Critical patent/AU2001232393A1/en
Publication of WO2001057449A1 publication Critical patent/WO2001057449A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/40—Fluid line arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F6/00—Air-humidification, e.g. cooling by humidification
    • F24F6/02—Air-humidification, e.g. cooling by humidification by evaporation of water in the air
    • F24F6/08—Air-humidification, e.g. cooling by humidification by evaporation of water in the air using heated wet elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F25B41/22—Disposition of valves, e.g. of on-off valves or flow control valves between evaporator and compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/37—Capillary tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/385—Dispositions with two or more expansion means arranged in parallel on a refrigerant line leading to the same evaporator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/124—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and being formed of pins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
    • F24F2003/144—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification by dehumidification only
    • F24F2003/1446—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification by dehumidification only by condensing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/20—Humidity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F6/00—Air-humidification, e.g. cooling by humidification
    • F24F6/02—Air-humidification, e.g. cooling by humidification by evaporation of water in the air
    • F24F6/08—Air-humidification, e.g. cooling by humidification by evaporation of water in the air using heated wet elements
    • F24F6/10—Air-humidification, e.g. cooling by humidification by evaporation of water in the air using heated wet elements heated electrically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/01—Heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2501—Bypass valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2521—On-off valves controlled by pulse signals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
    • F25B29/003—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the compression type system

Definitions

  • the present invention relates to a constant temperature-humidity oven, which is capable of controlling temperature and humidity in a wider range and reducing the consumption of energy
  • a constant temperature-humidity oven provides space, in which an experimental object is arranged, with a specific temperature and humidity environment
  • FIG 1 illustrates the structure of a conventional constant temperature- humidity oven
  • FIG 2 illustrates the structure of an air conditioning unit employed in FIG 1
  • the constant temperature-humidity oven includes a chamber 10, in which an experimental object is arranged, a first heater 1 1 for controlling temperature in the chamber 10, a humidifier 12 for controlling humidity in the chamber 10, a blower 13 for circulating the air in the chamber 10, and an air conditioning unit for controlling temperature and humidity in the chamber 10
  • the humidifier 12 includes a container 12b, in which water is contained, and a second heater 12a arranged in the container 12b, for heating water The heated water is vaporized by the air flowing on the water surface, and flowed in the chamber 10, and the humidity of the chamber 10 is thereby increased
  • the air conditioning unit includes a heat-absorbing and dehumidifying evaporator 14 for heat- absorbing and dehumidifying, a compressor 15 for compressing a high temperature and low pressure refrigerant gas passed through the heat-absorbing and dehumidifying evaporator 14 into a high pressure vapor, and a condenser 16 for emitting the heat of the refrigerant as a condensing heat to an outdoor air by changing a high temperature and pressure refrigerant gas into a high pressure liquid
  • the air conditioning unit also further includes an expansion valve 17 for lowering pressure so that the high pressure refrigerant liquid flowed in the heat- absorbing and dehumidifying evaporator 14 may be easily evaporated and a bypass valve 18 for guiding the refrigerant flowed from the condenser 16 directly to the compressor 15
  • the high pressure liquid refrigerant flowed from the condenser 16 passes through the expansion valve 17 and is changed into low pressure and is evaporated in the heat-absorbing and dehumidifying evaporator 14, and thereby the air conditioning unit absorbs an ambient latent heat, and the heat-absorbing and dehumidifying evaporator 14 lowers temperature and humidity in the chamber 10
  • the heat-absorbed high temperature and low pressure vapor refrigerant passes through the compressor 15 and is changed into a high temperature and pressure vapor and passes through the condenser 16 and the high temperature heat is cooled by the outdoor air and forms a cooling cycle to be the state of a high pressure liquid
  • heat is absorbed from the air in the chamber 10, and vapor is removed, and thereby temperature and humidity are lowered
  • the heat- absorbing and dehumidifying evaporator 14 must absorb heat, and simultaneously, the first heater 11 must be heated, and the humidifying amount of the humidifier 12 must be changed
  • the control of temperature and humidity can be performed by controlling the calorific value of the first heater 1 1 and the humidifying amount of the humidifier 12 in the state that the heat-absorbing and dehumidifying evaporator 14 absorbs heat constantly
  • an ambient temperature must be lowered by heightening the endothermic value of the heat- absorbing and dehumidifying evaporator 14
  • the ambient humidity is also lowered Therefore, in order to offset the drop of humidity and to keep the state of high humidity, the humidifying amount of the humidifier 12 must be very much heightened Since the water of the humidifier 12 in the state of a low temperature is not well evaporated, the calorific value of the second heater 12a must be heightened so as to induce evaporation for high humidity In other words since much energy is consumed, and temperature rises when the humidifying amount of the humidifier 12 is heightened, it is not easy to
  • an ambient humidity In order to form the state of a high temperature and low humidity, an ambient humidity must be lowered by heightening the endothermic value of the heat- absorbing and dehumidifying evaporator 14 and thereby heightening the dehumidifying amount
  • the calorific value of the first heater 1 1 In order to offer the drop of temperature and to keep the state of a high temperature, the calorific value of the first heater 1 1 must be very much heightened
  • the endothermic value of the heat- absorbing and dehumidifying evaporator 14 since the water of the humidifier 12 is easily and naturally evaporated as a high temperature is formed, the endothermic value of the heat- absorbing and dehumidifying evaporator 14 must be better heightened, and the dehumidifying amount of the heat-absorbing and dehumidifying evaporator 14 must be heightened so as to remove the vapor occurred as a result of this natural evaporation That is, the calorific value of the first heater 1 1 must be heightened, and
  • the constant temperature-humidity oven includes a chamber 100, in which an experimental object is arranged, a first heater 1 10 for rising in the temperature of the chamber 100, a humidifier 120 for controlling humidity in the chamber 100, a blower 130 for circulating the air in the chamber 100, and an air conditioning unit
  • the air conditioning unit includes an evaporator 150 for cooling arranged in the chamber 100, in which radiating fins 150a are installed, a compressor 220 for compressing a in-flowed refrigerant, a condenser 230 for emitting the heat of the refrigerant, an inlet pipe R1 for connecting the evaporator 150 for cooling and the condenser 230, an outlet pipe R2 for connecting the evaporator 150 for cooling and the compressor 220, and a by-pass valve 240 connected between the inlet pipe R1 and the outlet pipe R2, for guiding the refrigerant flowed from the condenser 230 directly to
  • the air conditioning unit further includes at least more than one means for controlling the flow quantity of the refrigerant connected between the evaporator 150 for cooling and the condenser 230
  • the air conditioning unit further includes a means for controlling the flow quantity of the refrigerant for controlling the flow quantity of an in-flowed refrigerant, a first evaporator 170 for dehumidifying, in which the refrigerant passed through the means for controlling the flow quantity of the refrigerant is flowed and a means for controlling the evaporating pressure of the refrigerant for controlling the evaporating pressure of the refrigerant passed through the first evaporator 170 for dehumidifying, connected between the inlet pipe R1 and the outlet pipe R2, respectively
  • the air conditioning unit further includes a means for controlling the flow quantity of the refrigerant for controlling the flow quantity of an in-flowed refrigerant, and a second evaporator 180 for dehumidifying arranged between the first evaporator 170 for dehumidifying and the humidifier 120, in which the refrigerant passed through the means for controlling the flow quantity of the refrigerant is flowed, connected between the inlet pipe R
  • FIG 2 illustrates the structure of an air conditioning unit employed in FIG 1
  • FIG 3 illustrates the structure of a constant temperature-humidity oven according to the present invention
  • FIG 4 illustrates the structure of a first embodiment of the air conditioning unit employed in FIG 3
  • FIG 5 is a sectional view of a tubular nozzle employed in FIG 4
  • FIG 6 illustrates the structure of a second embodiment of the air conditioning unit employed in FIG 3
  • FIG 7 illustrates the structure of a third embodiment of the air conditioning unit employed in FIG 3
  • FIG 8 is a graph illustrating the humidity pressure of water by temperature
  • FIG 3 illustrates the structure of a constant temperature-humidity oven according to the present invention
  • FIG 4 illustrates the structure of a first embodiment of the air conditioning unit employed in FIG 3
  • FIG 5 is a sectional view of a tubular nozzle employed in FIG 4
  • the constant temperature-humidity oven includes a chamber 100, in which an experimental object is arranged, a first heater 1 10 for rising in the temperature of the chamber 100, a humidifier 120 for controlling humidity in the chamber 100, a blower 130 for circulating the air in the chamber 100 a heat medium container 140, in which a heat medium 144 supplied to the inside of the chamber 100 is contained, and an air conditioning unit for controlling the temperature of the heat medium 144 with the control of the temperature and humidity in the chamber 100
  • the humidifier 120 consists of a humidifier container 121 , in which water is contained, and a second heater 122 installed in the humidifier container 121 , for heating water The heated water is vaporized by the second heater 122, and the humidity of the chamber 100 is thereby increased
  • a heat medium heater 141 in the heat medium 144 for rising in the temperature, and a pump for compulso ⁇ ly sending the heat medium 144 into a heat medium circulating pipe 160 to be later mentioned, are installed in the heat medium container 140
  • the pump consists
  • the evaporator 150 for cooling which is exclusively for cooling the temperature of the chamber 100, controls an ambient temperature below zero Radiating fins 150a having many faces are installed in the evaporator 150 for cooling so as to extend a contacting area with the air
  • the evaporator 150 for cooling is connected to the inlet pipe R1 and the outlet pipe R2 in a state of being connected in series to a means for controlling the flow quantity of an in-flowed refrigerant
  • at least more than one means for controlling the flow quantity of the refrigerant is in parallel connected Therefore, in this embodiment, two means for controlling the flow quantity of the refrigerant are employed
  • Each means for controlling the flow quantity of the refrigerant consists of a tubular nozzle 151 and a solenoid valve 152 , and a second tubular nozzle 153 and a second solenoid valve 154 serially connected
  • Radiating fins are not installed in the first evaporator 170 for dehumidifying otherwise than the evaporator 150 for cooling, and the first
  • the means for controlling the flow quantity of the refrigerant consist of a tubular nozzle 171 and a solenoid valve 172 having the same structure as the above-mentioned structure
  • the means for controlling the evaporating pressure of the refrigerant consist of a tubular nozzle 173, and a tubular nozzle 175 and a solenoid valve 176 serially connected in the state connected in parallel to the tubular nozzle 173
  • the tubular nozzle 173 of the means for controlling the evaporating pressure of the refrigerant prevents frost from growing in the first evaporator 170 for dehumidifying by the sudden drop of temperature by getting the refrigerant slightly flowed through itself
  • the solenoid valve 176 improves the distribution of temperature and endothermic value over the first evaporator 170 for dehumidifying by inducing the stepwise evaporation of the liquid refrigerant
  • the inside diameters of the tubular nozzles 173 and 175 are larger than those of other tubular nozzles to be later mentioned, and preferably, the inside diameter of the solenoid valve 176 is also large than those of other solenoid valves to be later mentioned This is to extend the controlling range of temperature
  • the second evaporator 180 for dehumidifying is arranged between the first evaporator 170 for dehumidifying and the humidifier 120
  • the second evaporator 180 for dehumidifying is connected to the inlet pipe R1 and the outlet pipe R2 in a state of being connected in series to the means for controlling the flow quantity of the refrigerant having the same structure as the above-mentioned structure
  • the means for controlling the flow quantity of the refrigerant consist of a tubular nozzle 181 and a solenoid valve 182 serially connected
  • the second evaporator 180 for dehumidifying forms the evaporating temperature of the lowest temperature of the refrigerant so as to have strong dehumidifying capacity
  • frost can occur in the second evaporator 180 for dehumidifying
  • the second evaporator 180 for dehumidifying is arranged in the space where air flows in the upper part of the humidifier 120 so as to remove obstacles to the flow of the air
  • the thickness of the frost grown in the second evaporator 180 for dehumidifying becomes somewhat thick the temperature of the second evaporator 180 for dehumidifying conducted on the surface of the frost balances with the temperature of air flowing on the surface of the frost Therefore, the thickness of the frost doesn't become thick any more
  • the second evaporator 180 for dehumidifying is used for controlling a low humidity region
  • the first humidifier evaporator 190 is arranged so that it may contact with the surface of the water contained in the humidifier 120
  • the first humidifier evaporator 190 is arranged so that it may contact with the surface of the water contained in the humidifier 120
  • the first humidifier evaporator 190 is connected to the inlet pipe R1 and the outlet pipe R2 in a state of being connected in series to the means for controlling the flow quantity of the refrigerant having the same structure as the above-mentioned structure
  • the means for controlling the flow quantity of the refrigerant consist of a tubular nozzle 191 and a solenoid valve 192 serially connected
  • the first humidifier evaporator 190 is capable of controlling minor humidity by selectively cooling or freezing a part of the water surface of the humidifier 120 and especially, it enables low humidity to be easily controlled
  • the second humidifier evaporator 200 is located under the second heater 122 of the humidifier 120
  • the second humidifier evaporator 200 is connected to the inlet pipe R1 and the outlet pipe R2 in a state of being connected in series to the means for controlling the flow quantity of the refrigerant having the same structure as the above-mentioned structure, and the means for controlling the flow quantity of the refrigerant consist of a tubular nozzle 201 and a solenoid valve 202 serially connected
  • the second humidifier evaporator 200 can control minor humidity by cooling all water in the humidifier 120 According to a graph illustrated in FIG 8, since the quantity of saturation vapor in a low temperature region is very small, frost can occur in the second evaporator 180 for dehumidifying In this case, when the temperature of the first humidifier evaporator 190 is more lowered than the temperature of the second evaporator 180 for dehumidifying, frost is formed in the first humidifier evaporator 190 contacted with water and frost doesn't
  • the heat medium evaporator 210 for dropping in the temperature of the heat medium 144 is arranged in the heat medium container 140
  • the heat medium evaporator 210 is connected to the inlet pipe R1 and the outlet pipe R2 in a state of being connected in series to the means for controlling the flow quantity of an in- flowed refrigerant
  • the means for controlling the flow quantity of the refrigerant consist of a tubular nozzle 21 1 and a solenoid valve 212 serially connected to the tubular nozzle 21 1 Since the flow quantity of the refrigerant flowed from the inlet pipe R1 can be controlled when the solenoid valve 212 is controlled, the temperature of the heat medium 144 can be dropped
  • the cooling temperature range of the heat medium 144 is controlled in the temperature above zero closely to 0°C
  • the heat medium circulating pipe 160 for circulating the heat medium 144 cooled in the range of temperature above zero by the heat medium evaporator 2 0, is arranged in the chamber 100
  • the heat medium 144 is compulso ⁇ ly transferred by a fan 142 and flows in the heat medium circulating pipe 160
  • frost since the temperature of the heat medium 144 is cooled at the lower temperature (beyond 0°C) than the setting temperature of the chamber 100, frost doesn't occur on the surface of the heat medium circulating pipe 160 Therefore, the heat medium circulating pipe 160 lowers the temperature of the ambient air, however the dehumidifying capacity for removing moisture in the air is very small Accordingly, it is effective on keeping the state of high humidity
  • a sensor 145 is installed in the heat medium container 140 The sensor 145 for constantly keeping the temperature of the heat medium 144, generates a signal operating the heat medium heater 141 when the temperature of the heat medium
  • the compressor 220 compresses an in-flowed high temperature and low pressure refrigerant gas into a high pressure gas, and the condenser 230 emits the heat of the refrigerant as a condensing heat to an outdoor air by changing a high pressure and temperature refrigerant gas into a high pressure liquid
  • the by-pass valve 240 consists of a tubular nozzle 241 and a solenoid valve 242 having the same structure as that of the means for controlling the flow quantity of the refrigerant, serially connected
  • the by-pass valve 240 control the state of a high temperature
  • the by-pass valve 240 mixes a refrigerant gas cooled from the condenser 230 with a high temperature refrigerant gas passed through the evaporators 150, 170, 180, 190 and 200 in the outlet pipe R2 and lowers temperature and flows in the compressor 220 in order to prevent the damage of the compressor 220 by overload, which may be occurred in a case where a high temperature refrigerant gas passed through the evaporator 150 for cooling or the first and second evaporators 170 and 180 for dehumidifying, and the first and second humidifier evaporators 190 and 200 are flowed directly in the compressor 220, Accordingly, overload by high temperature can be prevented, and the damage of the compressor 230 can be thereby prevented.
  • FIG 5 which illustrates the extracted tubular nozzle 151
  • a through ball 151 b is formed in the tube 151 a
  • the resistance of the refrigerant passed through the tubular nozzle 151 depends on an inside diameter and a length L. Therefore, the standard of the tubular nozzle 151 is properly set according to the capacity or use of an air conditioning unit
  • the tubular nozzle of which inside diameter d is between about 0 3mm and 2mm and length L is between about o 5mm and 30mm, is used Since the functions of the tubular nozzles are same, the functions of the constant temperature-humidity oven employing the tubular nozzles are same. Since the solenoid valves 152, 154, 172, 176, 182, 1 92, 202, 212 and 242 for controlling the flow quantity of the refrigerant are generally used in the air conditioning unit, a detailed description thereof will be omitted
  • FIG. 6 illustrates the structure of a second embodiment of the air conditioning unit employed in FIG. 3
  • FIG.7 illustrates the structure of a third embodiment of the air conditioning unit employed in FIG. 3.
  • the same reference numerals as those of FIG. 4 denote the same items having the same function.
  • the difference between the second embodiment of the air conditioning unit and the first embodiment of the air conditioning unit is that the tubular nozzles 151 , 153, 171 , 173, 176, 181 , 191 , 201 and 221 in the first embodiment are replaced with the known capillary tubes 251 , 253, 271 , 273, 275, 281 , 291 and 301 , in which holes are formed
  • the difference between the third embodiment of the air conditioning unit and the first embodiment of the air conditioning unit is that the means for controlling the flow quantity of the refrigerant, the means for controlling the evaporating pressure of the refrigerant, and the by-pass valve are replaced with the diaphragm-shaped needle valves 452, 454, 472, 476, 482, 492, 502, 522 and 540, in which stepping motors are installed Since the diaphragm-shaped needle valves are very general valves for controlling the flow of the refrigerant by applied power, a detailed description thereof will be omitted.
  • the operations of the second and third embodiments of the constant temperature-humidity oven employed the air conditioning unit are very similar to that of the first embodiment Hereinafter, the operation of the constant temperature-humidity oven will be described
  • the first evaporator 170 for dehumidifying must be in the state of high pressure evaporation (The solenoid valve 176 is turned off ) so as to rise the evaporating temperature, and the endothermic value must be lowered, and then, the first and second heaters 1 10 and 122 must be operated
  • the power consumption of the heater requiring to heat is minimized
  • Dehumidifying capacity in the state of low humidity must be heightened, or the evaporating energy of the water contained in the humidifier container 121 must be lowered
  • a The second evaporator 180 for dehumidifying for an exclusive use in low temperature must be operated and perform strong dehumidifying, and then the first and second heaters 1 10 an 122 must be operated b
  • One of the first and second humidifier evaporators 190 and 200 in the humidifier container 121 must be operated, and natural evaporation must be suppressed by removing the evaporating energy of the water contained in the humidifier container 121 and then, the first and second heaters 110 and 122 must 5 be operated
  • the first evaporator 170 for dehumidifying must be in the state of low 0 pressure evaporation (The solenoid valve 176 is turned on ) so as to drop the evaporating temperature and then, the first heater 1 10 must be operated After that, the second evaporator 180 for dehumidifying for an exclusive use in low temperature must be operated and perform strong dehumidifying, and then, the second heater 122 must be operated b
  • the first evaporator 170 for dehumidifying must be in the state of low pressure evaporation (The solenoid valve 176 is turned on ) so as to drop the evaporating temperature, and then
  • the evaporator 150 for exclusively cooling After emptying the water contained in the humidifier container 121 , the evaporator 150 for exclusively cooling must be operated, and then, temperature is controlled by the first heater 1 10
  • the present invention enables temperature and humidity in the constant temperature-humidity oven to be controlled in a wider range by employing the evaporator for cooling, the first and second evaporators for dehumidifying, the first and second humidifier evaporators 190 and 200, the heat medium circulating pipe, the means for controlling the flow quantity of the refrigerant, and the means for controlling the evaporating pressure of the refrigerant, and the present invention can reduce the consumption of energy
  • the present invention can control humidity in the case of below 0°C or beyond 100°C

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Abstract

A constant temperature-humidity oven is provided. The constant temperature-humidity oven includes a chamber 100, a first heater 110 for rising in the temperature of the chamber 100, a humidifier 120 for controlling humidity in the chamber 100, a blower 130 for circulating the air in the chamber 100, and an air conditioning unit. The air conditioning unit includes an evaporator 150 for cooling arranged in the chamber 100, a compressor 220, a condenser 230, an inlet pipe R1 for connecting the evaporator 150 for cooling and the condenser 230, an outlet pipe R2 for connecting the evaporator 150 for cooling and the compressor 220, and a by-pass valve 240 connected between the inlet pipe R1 and the outlet pipe R2.. The air conditioning unit includes a heat medium container 140, in which a heat medium 144 is contained, a heat medium evaporator 210 contained in the heat medium 144, a means arranged between the heat medium evaporator 210 and the inlet pipe R1 for controlling the flow quantity of the refrigerant, and a heat medium circulating pipe 160 arranged in the chamber 100 for circulating the heat medium 144.

Description

CONSTANT TEMPERATURE-HUMIDITY OVEN
BACKGROUND OF THE INVENTION
1 Field of the Invention
The present invention relates to a constant temperature-humidity oven, which is capable of controlling temperature and humidity in a wider range and reducing the consumption of energy
2 Description of the Related Art
A constant temperature-humidity oven provides space, in which an experimental object is arranged, with a specific temperature and humidity environment
FIG 1 illustrates the structure of a conventional constant temperature- humidity oven, and FIG 2 illustrates the structure of an air conditioning unit employed in FIG 1 As shown in Fig 1 , the constant temperature-humidity oven includes a chamber 10, in which an experimental object is arranged, a first heater 1 1 for controlling temperature in the chamber 10, a humidifier 12 for controlling humidity in the chamber 10, a blower 13 for circulating the air in the chamber 10, and an air conditioning unit for controlling temperature and humidity in the chamber 10 The humidifier 12 includes a container 12b, in which water is contained, and a second heater 12a arranged in the container 12b, for heating water The heated water is vaporized by the air flowing on the water surface, and flowed in the chamber 10, and the humidity of the chamber 10 is thereby increased
The air conditioning unit, as shown in FIG 2, in which many radiating fins are installed, includes a heat-absorbing and dehumidifying evaporator 14 for heat- absorbing and dehumidifying, a compressor 15 for compressing a high temperature and low pressure refrigerant gas passed through the heat-absorbing and dehumidifying evaporator 14 into a high pressure vapor, and a condenser 16 for emitting the heat of the refrigerant as a condensing heat to an outdoor air by changing a high temperature and pressure refrigerant gas into a high pressure liquid The air conditioning unit also further includes an expansion valve 17 for lowering pressure so that the high pressure refrigerant liquid flowed in the heat- absorbing and dehumidifying evaporator 14 may be easily evaporated and a bypass valve 18 for guiding the refrigerant flowed from the condenser 16 directly to the compressor 15
The high pressure liquid refrigerant flowed from the condenser 16 passes through the expansion valve 17 and is changed into low pressure and is evaporated in the heat-absorbing and dehumidifying evaporator 14, and thereby the air conditioning unit absorbs an ambient latent heat, and the heat-absorbing and dehumidifying evaporator 14 lowers temperature and humidity in the chamber 10
After that, the heat-absorbed high temperature and low pressure vapor refrigerant passes through the compressor 15 and is changed into a high temperature and pressure vapor and passes through the condenser 16 and the high temperature heat is cooled by the outdoor air and forms a cooling cycle to be the state of a high pressure liquid Through this process, heat is absorbed from the air in the chamber 10, and vapor is removed, and thereby temperature and humidity are lowered
In the structure of the constant temperature-humidity oven, it is substantially impossible for cooling capacity to be exactly controlled on the characteristics of the air conditioning unit Accordingly, in order to form the state of a constant temperature, power must be applied, and the first heater 11 must be heated, and simultaneously the air conditioning unit must be operated so that the heat-absorbing and dehumidifying evaporator 14 may absorb heat
In addition, in order to form the state of a constant humidity, the heat- absorbing and dehumidifying evaporator 14 must absorb heat, and simultaneously, the first heater 11 must be heated, and the humidifying amount of the humidifier 12 must be changed
That is, the control of temperature and humidity can be performed by controlling the calorific value of the first heater 1 1 and the humidifying amount of the humidifier 12 in the state that the heat-absorbing and dehumidifying evaporator 14 absorbs heat constantly In order to form the state of a low temperature and high humidity, an ambient temperature must be lowered by heightening the endothermic value of the heat- absorbing and dehumidifying evaporator 14 However, when the endothermic value of the heat-absorbing and dehumidifying evaporator 14 is heightened, the ambient humidity is also lowered Therefore, in order to offset the drop of humidity and to keep the state of high humidity, the humidifying amount of the humidifier 12 must be very much heightened Since the water of the humidifier 12 in the state of a low temperature is not well evaporated, the calorific value of the second heater 12a must be heightened so as to induce evaporation for high humidity In other words since much energy is consumed, and temperature rises when the humidifying amount of the humidifier 12 is heightened, it is not easy to keep the state of a low temperature and high humidity
In order to form the state of a high temperature and low humidity, an ambient humidity must be lowered by heightening the endothermic value of the heat- absorbing and dehumidifying evaporator 14 and thereby heightening the dehumidifying amount However, when the endothermic value of the heat-absorbing and dehumidifying evaporator 14 is heightened, the ambient temperature is also lowered Therefore, in order to offer the drop of temperature and to keep the state of a high temperature, the calorific value of the first heater 1 1 must be very much heightened Here, since the water of the humidifier 12 is easily and naturally evaporated as a high temperature is formed, the endothermic value of the heat- absorbing and dehumidifying evaporator 14 must be better heightened, and the dehumidifying amount of the heat-absorbing and dehumidifying evaporator 14 must be heightened so as to remove the vapor occurred as a result of this natural evaporation That is, the calorific value of the first heater 1 1 must be heightened, and the dehumidifying amount of the heat-absorbing and dehumidifying evaporator 14 must be heigntened, since in this process, much energy is consumed and temperature is lowered, it is not easy to keep the state of a high temperature and low humidity Meanwhile, in order to form the state of a low temperature and humidity, for example, in a case where the control of humidity is made at the low temperature of about 10°C, as shown in FIG 8 since saturation vapor pressure in 10°C is 9 2mmHg, when humidity is about 50% controlled, saturation vapor pressure at the surface temperature of the heat-absorbing and dehumidifying evaporator 14 must be less than 4 6mmHg However, in a case where saturation vapor pressure is less than 4 6mmHg, the surface temperature of the heat-absorbing and dehumidifying evaporator 14 drops to below 0°C, and thereby frost grows on the surface Then, an air circulation is hindered by a grown frost, and in order to remove the frost, a defroster (not shown) should have installed Also, when defrosting by the defroster, a frozen frost is melt, and thereby humidity is increased, and it is impossible to keep the state of a low temperature and humidity for a long time
SUMMARY OF THE INVENTION
To solve the above problems, it is an object of the present invention to provide a constant temperature-humidity oven, which enables a low temperature and humidity, a low temperature and high humidity, a high temperature and low humidity, and a high temperature and humidity to be easily formed and is capable of minimizing the consumption of energy
Accordingly, to achieve the above object, there is provided a constant temperature-humidity oven The constant temperature-humidity oven includes a chamber 100, in which an experimental object is arranged, a first heater 1 10 for rising in the temperature of the chamber 100, a humidifier 120 for controlling humidity in the chamber 100, a blower 130 for circulating the air in the chamber 100, and an air conditioning unit The air conditioning unit includes an evaporator 150 for cooling arranged in the chamber 100, in which radiating fins 150a are installed, a compressor 220 for compressing a in-flowed refrigerant, a condenser 230 for emitting the heat of the refrigerant, an inlet pipe R1 for connecting the evaporator 150 for cooling and the condenser 230, an outlet pipe R2 for connecting the evaporator 150 for cooling and the compressor 220, and a by-pass valve 240 connected between the inlet pipe R1 and the outlet pipe R2, for guiding the refrigerant flowed from the condenser 230 directly to the compressor 220 The air conditioning unit includes a heat medium container 140 in which a heat medium 144 is contained, a heat medium evaporator 210 contained in the heat medium 144 for cooling the heat medium 144, a means arranged between the heat medium evaporator 210 and the inlet pipe R1 for controlling the flow quantity of the refrigerant, and a heat medium circulating pipe 160 arranged in the chamber 100 for circulating the heat medium 144
Here, the air conditioning unit further includes at least more than one means for controlling the flow quantity of the refrigerant connected between the evaporator 150 for cooling and the condenser 230
In addition, the air conditioning unit further includes a means for controlling the flow quantity of the refrigerant for controlling the flow quantity of an in-flowed refrigerant, a first evaporator 170 for dehumidifying, in which the refrigerant passed through the means for controlling the flow quantity of the refrigerant is flowed and a means for controlling the evaporating pressure of the refrigerant for controlling the evaporating pressure of the refrigerant passed through the first evaporator 170 for dehumidifying, connected between the inlet pipe R1 and the outlet pipe R2, respectively Also, the air conditioning unit further includes a means for controlling the flow quantity of the refrigerant for controlling the flow quantity of an in-flowed refrigerant, and a second evaporator 180 for dehumidifying arranged between the first evaporator 170 for dehumidifying and the humidifier 120, in which the refrigerant passed through the means for controlling the flow quantity of the refrigerant is flowed, connected between the inlet pipe R1 and the outlet pipe R2, respectively Meanwhile, the air conditioning unit further includes a means for controlling the flow quantity of the refrigerant for controlling the flow quantity of an in-flowed refrigerant, a first humidifier evaporator 190 arranged on the surface of the fluid of the humidifier 120, in which the refrigerant passed through the means for controlling the flow quantity of the refrigerant is flowed, connected between the inlet pipe R1 and the outlet pipe R2, respectively, and a means for controlling the flow quantity of the refrigerant for controlling the flow quantity of an in-flowed refrigerant, and a second humidifier evaporator 200 arranged in the fluid of the humidifier 120, in which the refrigerant passed through the means for controlling the flow quantity of the refrigerant is flowed, serially connected between the inlet pipe R1 and the outlet pipe R2, respectively BRIEF DESCRIPTION OF THE DRAWINGS The above object and advantages of the present invention will become more apparent by describing in detail preferred embodiments thereof with reference to the attached drawings in which FIG 1 illustrates the structure of a conventional constant temperature- humidity oven,
FIG 2 illustrates the structure of an air conditioning unit employed in FIG 1 , FIG 3 illustrates the structure of a constant temperature-humidity oven according to the present invention, FIG 4 illustrates the structure of a first embodiment of the air conditioning unit employed in FIG 3,
FIG 5 is a sectional view of a tubular nozzle employed in FIG 4 FIG 6 illustrates the structure of a second embodiment of the air conditioning unit employed in FIG 3, FIG 7 illustrates the structure of a third embodiment of the air conditioning unit employed in FIG 3, and
FIG 8 is a graph illustrating the humidity pressure of water by temperature
DETAILED DESCRIPTION OF THE INVENTION
FIG 3 illustrates the structure of a constant temperature-humidity oven according to the present invention, and FIG 4 illustrates the structure of a first embodiment of the air conditioning unit employed in FIG 3, and FIG 5 is a sectional view of a tubular nozzle employed in FIG 4
As shown in FIG 3, the constant temperature-humidity oven includes a chamber 100, in which an experimental object is arranged, a first heater 1 10 for rising in the temperature of the chamber 100, a humidifier 120 for controlling humidity in the chamber 100, a blower 130 for circulating the air in the chamber 100 a heat medium container 140, in which a heat medium 144 supplied to the inside of the chamber 100 is contained, and an air conditioning unit for controlling the temperature of the heat medium 144 with the control of the temperature and humidity in the chamber 100 The humidifier 120 consists of a humidifier container 121 , in which water is contained, and a second heater 122 installed in the humidifier container 121 , for heating water The heated water is vaporized by the second heater 122, and the humidity of the chamber 100 is thereby increased A heat medium heater 141 in the heat medium 144 for rising in the temperature, and a pump for compulsoπly sending the heat medium 144 into a heat medium circulating pipe 160 to be later mentioned, are installed in the heat medium container 140 The pump consists of a fan 142, which is sunk in the heat medium 144 and rotated, and a motor 143 for rotating the fan 142 The air conditioning unit, as shown in FIG 4, includes a compressor 220, a condenser 230, an inlet pipe R1 connected to the condenser 230, and an outlet pipe R2 connected to the compressor 220 An evaporator 150 for cooling a first evaporator 170 for dehumidifying a second evaporator 180 for dehumidifying first and second humidifier evaporators 190 and 200 arranged in the humidifier container 121 , and a heat medium evaporator 210 sunk in the heat medium 144 are connected in parallel between the inlet pip R1 and the outlet pipe R2, respectively Also, a by-pass valve 240 for guiding the refrigerant flowed from the condenser 230 directly to the compressor 220 is connected between the inlet pipe R1 and the outlet
The evaporator 150 for cooling, which is exclusively for cooling the temperature of the chamber 100, controls an ambient temperature below zero Radiating fins 150a having many faces are installed in the evaporator 150 for cooling so as to extend a contacting area with the air The evaporator 150 for cooling is connected to the inlet pipe R1 and the outlet pipe R2 in a state of being connected in series to a means for controlling the flow quantity of an in-flowed refrigerant Here, preferably, at least more than one means for controlling the flow quantity of the refrigerant is in parallel connected Therefore, in this embodiment, two means for controlling the flow quantity of the refrigerant are employed Each means for controlling the flow quantity of the refrigerant consists of a tubular nozzle 151 and a solenoid valve 152 , and a second tubular nozzle 153 and a second solenoid valve 154 serially connected Radiating fins are not installed in the first evaporator 170 for dehumidifying otherwise than the evaporator 150 for cooling, and the first evaporator 170 for dehumidifying is located between the heat medium circulating pipe 160 and the second evaporator 180 for dehumidifying The means for controlling the flow quantity of the refrigerant having the same structure as the above-mentioned structure is connected to the one side of the first evaporator 170 for dehumidifying, and a means for controlling the evaporating pressure of the refrigerant, which controls the evaporating temperature of the refrigerant by controlling the evaporating pressure of a liquid refrigerant, is connected to the other side of the first evaporator 170 for dehumidifying The means for controlling the evaporating pressure of the refrigerant, the first evaporator 170 for dehumidifying, and the means for controlling the flow quantity of the refrigerant are connected to the inlet pipe R1 and the outlet pipe R2 in a state of being connected in series
The means for controlling the flow quantity of the refrigerant consist of a tubular nozzle 171 and a solenoid valve 172 having the same structure as the above-mentioned structure
The means for controlling the evaporating pressure of the refrigerant consist of a tubular nozzle 173, and a tubular nozzle 175 and a solenoid valve 176 serially connected in the state connected in parallel to the tubular nozzle 173 The tubular nozzle 173 of the means for controlling the evaporating pressure of the refrigerant prevents frost from growing in the first evaporator 170 for dehumidifying by the sudden drop of temperature by getting the refrigerant slightly flowed through itself The solenoid valve 176 improves the distribution of temperature and endothermic value over the first evaporator 170 for dehumidifying by inducing the stepwise evaporation of the liquid refrigerant Here, preferably, the inside diameters of the tubular nozzles 173 and 175 are larger than those of other tubular nozzles to be later mentioned, and preferably, the inside diameter of the solenoid valve 176 is also large than those of other solenoid valves to be later mentioned This is to extend the controlling range of temperature by relatively enlarging the evaporating range of the first evaporator 170 for dehumidifying
The second evaporator 180 for dehumidifying is arranged between the first evaporator 170 for dehumidifying and the humidifier 120 The second evaporator 180 for dehumidifying is connected to the inlet pipe R1 and the outlet pipe R2 in a state of being connected in series to the means for controlling the flow quantity of the refrigerant having the same structure as the above-mentioned structure Here, the means for controlling the flow quantity of the refrigerant consist of a tubular nozzle 181 and a solenoid valve 182 serially connected
The second evaporator 180 for dehumidifying forms the evaporating temperature of the lowest temperature of the refrigerant so as to have strong dehumidifying capacity Here, according to a graph illustrated in FIG 8, since the quantity of saturation vapor in a low temperature region is very small, frost can occur in the second evaporator 180 for dehumidifying In this case, the second evaporator 180 for dehumidifying is arranged in the space where air flows in the upper part of the humidifier 120 so as to remove obstacles to the flow of the air Accordingly, when the thickness of the frost grown in the second evaporator 180 for dehumidifying becomes somewhat thick the temperature of the second evaporator 180 for dehumidifying conducted on the surface of the frost balances with the temperature of air flowing on the surface of the frost Therefore, the thickness of the frost doesn't become thick any more The second evaporator 180 for dehumidifying is used for controlling a low humidity region
The first humidifier evaporator 190 is arranged so that it may contact with the surface of the water contained in the humidifier 120 The first humidifier evaporator
190 is connected to the inlet pipe R1 and the outlet pipe R2 in a state of being connected in series to the means for controlling the flow quantity of the refrigerant having the same structure as the above-mentioned structure The means for controlling the flow quantity of the refrigerant consist of a tubular nozzle 191 and a solenoid valve 192 serially connected The first humidifier evaporator 190 is capable of controlling minor humidity by selectively cooling or freezing a part of the water surface of the humidifier 120 and especially, it enables low humidity to be easily controlled
The second humidifier evaporator 200 is located under the second heater 122 of the humidifier 120 The second humidifier evaporator 200 is connected to the inlet pipe R1 and the outlet pipe R2 in a state of being connected in series to the means for controlling the flow quantity of the refrigerant having the same structure as the above-mentioned structure, and the means for controlling the flow quantity of the refrigerant consist of a tubular nozzle 201 and a solenoid valve 202 serially connected The second humidifier evaporator 200 can control minor humidity by cooling all water in the humidifier 120 According to a graph illustrated in FIG 8, since the quantity of saturation vapor in a low temperature region is very small, frost can occur in the second evaporator 180 for dehumidifying In this case, when the temperature of the first humidifier evaporator 190 is more lowered than the temperature of the second evaporator 180 for dehumidifying, frost is formed in the first humidifier evaporator 190 contacted with water and frost doesn't occur in the second evaporator 180 for dehumidifying That is, it is possible for minor humidifying amount to be controlled by forming ice on the water surface by the first humidifier evaporator 190 Here in order to control low humidity more easily the second humidifier evaporator 200 can cool the overall temperature of water Like this, the first and second humidifier evaporators 190 and 200 suppresses the natural evaporation of water by energy of the air circulating the chamber 100 and suppresses the occurrence of frost in the second evaporator 180 for dehumidifying by lowering the temperature of water than the surface temperature of the second evaporator 180 for dehumidifying Through the above-mentioned structure, even if frost occurs in the second evaporator 180 foe dehumidifying, some frost occurs and is not increased any more, and use of a defroster conventionally employed to remove frost can be excluded
The heat medium evaporator 210 for dropping in the temperature of the heat medium 144 is arranged in the heat medium container 140 The heat medium evaporator 210 is connected to the inlet pipe R1 and the outlet pipe R2 in a state of being connected in series to the means for controlling the flow quantity of an in- flowed refrigerant Here, the means for controlling the flow quantity of the refrigerant consist of a tubular nozzle 21 1 and a solenoid valve 212 serially connected to the tubular nozzle 21 1 Since the flow quantity of the refrigerant flowed from the inlet pipe R1 can be controlled when the solenoid valve 212 is controlled, the temperature of the heat medium 144 can be dropped The cooling temperature range of the heat medium 144 is controlled in the temperature above zero closely to 0°C
The heat medium circulating pipe 160 for circulating the heat medium 144 cooled in the range of temperature above zero by the heat medium evaporator 2 0, is arranged in the chamber 100 The heat medium 144 is compulsoπly transferred by a fan 142 and flows in the heat medium circulating pipe 160 Here, since the temperature of the heat medium 144 is cooled at the lower temperature (beyond 0°C) than the setting temperature of the chamber 100, frost doesn't occur on the surface of the heat medium circulating pipe 160 Therefore, the heat medium circulating pipe 160 lowers the temperature of the ambient air, however the dehumidifying capacity for removing moisture in the air is very small Accordingly, it is effective on keeping the state of high humidity
A sensor 145 is installed in the heat medium container 140 The sensor 145 for constantly keeping the temperature of the heat medium 144, generates a signal operating the heat medium heater 141 when the temperature of the heat medium
144 drops and the sensor 145 generates a signal operating the heat medium evaporator 210 when the temperature of the heat medium 144 rises The signals are used for signals, which are transmitted to a controller (not shown) and operate the heat medium heater 141 or the heat medium evaporator 210 The compressor 220 compresses an in-flowed high temperature and low pressure refrigerant gas into a high pressure gas, and the condenser 230 emits the heat of the refrigerant as a condensing heat to an outdoor air by changing a high pressure and temperature refrigerant gas into a high pressure liquid
The by-pass valve 240 consists of a tubular nozzle 241 and a solenoid valve 242 having the same structure as that of the means for controlling the flow quantity of the refrigerant, serially connected The by-pass valve 240 control the state of a high temperature Also, the by-pass valve 240 mixes a refrigerant gas cooled from the condenser 230 with a high temperature refrigerant gas passed through the evaporators 150, 170, 180, 190 and 200 in the outlet pipe R2 and lowers temperature and flows in the compressor 220 in order to prevent the damage of the compressor 220 by overload, which may be occurred in a case where a high temperature refrigerant gas passed through the evaporator 150 for cooling or the first and second evaporators 170 and 180 for dehumidifying, and the first and second humidifier evaporators 190 and 200 are flowed directly in the compressor 220, Accordingly, overload by high temperature can be prevented, and the damage of the compressor 230 can be thereby prevented. The structures of the tubular nozzles 151 , 153, 171 , 173, 175, 181 , 191 , 201 ,
21 1 , and 241 are same, as shown in FIG 5, which illustrates the extracted tubular nozzle 151 , a through ball 151 b is formed in the tube 151 a The resistance of the refrigerant passed through the tubular nozzle 151 depends on an inside diameter and a length L. Therefore, the standard of the tubular nozzle 151 is properly set according to the capacity or use of an air conditioning unit In this embodiment, the tubular nozzle, of which inside diameter d is between about 0 3mm and 2mm and length L is between about o 5mm and 30mm, is used Since the functions of the tubular nozzles are same, the functions of the constant temperature-humidity oven employing the tubular nozzles are same. Since the solenoid valves 152, 154, 172, 176, 182, 1 92, 202, 212 and 242 for controlling the flow quantity of the refrigerant are generally used in the air conditioning unit, a detailed description thereof will be omitted
FIG. 6 illustrates the structure of a second embodiment of the air conditioning unit employed in FIG. 3, and FIG.7 illustrates the structure of a third embodiment of the air conditioning unit employed in FIG. 3. Here, the same reference numerals as those of FIG. 4 denote the same items having the same function.
The difference between the second embodiment of the air conditioning unit and the first embodiment of the air conditioning unit is that the tubular nozzles 151 , 153, 171 , 173, 176, 181 , 191 , 201 and 221 in the first embodiment are replaced with the known capillary tubes 251 , 253, 271 , 273, 275, 281 , 291 and 301 , in which holes are formed
The difference between the third embodiment of the air conditioning unit and the first embodiment of the air conditioning unit is that the means for controlling the flow quantity of the refrigerant, the means for controlling the evaporating pressure of the refrigerant, and the by-pass valve are replaced with the diaphragm-shaped needle valves 452, 454, 472, 476, 482, 492, 502, 522 and 540, in which stepping motors are installed Since the diaphragm-shaped needle valves are very general valves for controlling the flow of the refrigerant by applied power, a detailed description thereof will be omitted The operations of the second and third embodiments of the constant temperature-humidity oven employed the air conditioning unit are very similar to that of the first embodiment Hereinafter, the operation of the constant temperature-humidity oven will be described
1 ) In case of high temperature and humidity
Only when there is no cooling or small cooling in the state of high temperature having a great difference from room temperature, the power consumption of the first heater 1 10 requiring to heat is minimized Only when there is no dehumidifying or small dehumidifying in the state of high humidity, the power consumption of the second heater 122 requiring to humidify is minimized In order to make the state of the evaporator 150 for cooling satisfying this, for example (although it depends on the setting of temperature and humidity), a The supply of the refrigerant to the evaporators 150, 170, 180, 190, and
200 must be stopped, and the first and second heaters 1 10 and 122 must be operated b The first evaporator 170 for dehumidifying must be in the state of high pressure evaporation (The solenoid valve 176 is turned off ) so as to rise the evaporating temperature, and the endothermic value must be lowered, and then, the first and second heaters 1 10 and 122 must be operated
2) In case of high temperature and low humidity
Only when there is no cooling or small cooling in the state of high temperature having a great difference from room temperature, the power consumption of the heater requiring to heat is minimized Dehumidifying capacity in the state of low humidity must be heightened, or the evaporating energy of the water contained in the humidifier container 121 must be lowered In order to make the state of the evaporator for dehumidifying satisfying this, for example (although it depends on the setting of temperature and humidity), a The second evaporator 180 for dehumidifying for an exclusive use in low temperature must be operated and perform strong dehumidifying, and then the first and second heaters 1 10 an 122 must be operated b One of the first and second humidifier evaporators 190 and 200 in the humidifier container 121 must be operated, and natural evaporation must be suppressed by removing the evaporating energy of the water contained in the humidifier container 121 and then, the first and second heaters 110 and 122 must 5 be operated
3) In case of low temperature and high humidity
Only when cooling and heating are together performed in the state of lower temperature than room temperature, it is possible for temperature to be exactly controlled In the state of high humidity, an evaporator having a small dehumidifying o effect must be operated In order to make the state of the evaporator for dehumidifying satisfying this, for example (although it depends on the setting of temperature and humidity), a The temperature of the heat medium 144 flowing in the heat medium circulating pipe 160 must be slightly lower than the setting temperature (between 5 about 0 5°C and about 5°C, beyond 0°C), and then, the first and second heaters 1 10 and 122 must be operated b The first evaporator 170 for dehumidifying must be in the state of high pressure evaporation (The solenoid valve 176 is turned off, but the evaporating temperature must be higher than the setting temperature ) so as to rise the o evaporating temperature, and the endothermic value must be lowered, and then, the first and second heaters 110 and 122 must be operated
4) In case of low temperature and humidity
Only when cooling and heating are together performed in the state of lower temperature than room temperature, it is possible for temperature to be exactly 5 controlled In the state of low temperature and humidity, an evaporator having a pretty large dehumidifying effect must be used In order to make the state of the evaporator for dehumidifying satisfying this, for example (although it depends on the setting of temperature and humidity), a The first evaporator 170 for dehumidifying must be in the state of low 0 pressure evaporation (The solenoid valve 176 is turned on ) so as to drop the evaporating temperature and then, the first heater 1 10 must be operated After that, the second evaporator 180 for dehumidifying for an exclusive use in low temperature must be operated and perform strong dehumidifying, and then, the second heater 122 must be operated b The first evaporator 170 for dehumidifying must be in the state of low pressure evaporation (The solenoid valve 176 is turned on ) so as to drop the evaporating temperature, and then, the first heater 1 10 must be operated After that, one of the first and second humidifier evaporators 190 and 200 in the humidifier container 121 must be operated, and natural evaporation must be suppressed by removing the evaporating energy of the water contained in the humidifier container 121 , and then, the second heater 122 must be operated Next, the second evaporator 180 for dehumidifying for an exclusive use in low temperature must be operated and perform strong dehumidifying, and then, the second heater 122 must be operated
5) In the case of controlling temperature below zero
After emptying the water contained in the humidifier container 121 , the evaporator 150 for exclusively cooling must be operated, and then, temperature is controlled by the first heater 1 10
As described above, the present invention enables temperature and humidity in the constant temperature-humidity oven to be controlled in a wider range by employing the evaporator for cooling, the first and second evaporators for dehumidifying, the first and second humidifier evaporators 190 and 200, the heat medium circulating pipe, the means for controlling the flow quantity of the refrigerant, and the means for controlling the evaporating pressure of the refrigerant, and the present invention can reduce the consumption of energy
Also, by employing the first humidifier evaporator arranged to be contacted with the water surface and the second humidifier evaporator arranged in the water, the present invention can control humidity in the case of below 0°C or beyond 100°C
In addition, since frost is hardly formed in the present invention, use of a defroster for removing frost can be excluded While this invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims

Claims

What is claimed is
1 A constant temperature-humidity oven comprising a chamber 100, in which an experimental object is arranged, a first heater 110 for rising in the temperature of the chamber 100, a humidifier 120 for controlling humidity in the chamber 100, a blower 130 for circulating the air in the chamber 100, and an air conditioning unit, wherein the air conditioning unit comprising an evaporator 150 for cooling arranged in the chamber 100, in which radiating fins 150a are installed, a compressor 220 for compressing a in-flowed refrigerant, a condenser 230 for emitting the heat of the refrigerant, an inlet pipe R1 for connecting the evaporator 150 for cooling and the condenser 230, an outlet pipe R2 for connecting the evaporator 150 for cooling and the compressor 220, and a by-pass valve 240 connected between the inlet pipe R1 and the outlet pipe R2, for guiding the refrigerant flowed from the condenser 230 directly to the compressor 220 wherein the air conditioning unit includes a heat medium container 140, in which a heat medium 144 is contained, a heat medium evaporator 210 contained in the heat medium 144 for cooling the heat medium 144, a means arranged between the heat medium evaporator 210 and the inlet pipe R1 for controlling the flow quantity of the refrigerant, and a heat medium circulating pipe 160 arranged in the chamber 100 for circulating the heat medium 144
2 The constant temperature-humidity oven according to claim 1 , wherein the air conditioning unit further includes at least more than one means for controlling the flow quantity of the refrigerant connected between the evaporator 150 for cooling and the condenser 230
3. The constant temperature-humidity oven according to claim 2, wherein the air conditioning unit further includes a means for controlling the flow quantity of the refrigerant for controlling the flow quantity of an in-flowed refrigerant, a first evaporator 170 for dehumidifying, in which the refrigerant passed through the means for controlling the flow quantity of the refrigerant is flowed, and a means for controlling the evaporating pressure of the refrigerant for controlling the evaporating pressure of the refrigerant passed through the first evaporator 170 for dehumidifying, connected between the inlet pipe R1 and the outlet pipe R2, respectively.
4. The constant temperature-humidity oven according to claim 3, wherein the means for controlling the evaporating pressure of the refrigerant consist of a tubular nozzle 173 for inducing the high pressure evaporation of the refrigerant, a tubular nozzle 175 and a solenoid valve 176 connected to the tubular nozzle 173 in the state connected in parallel to the tubular nozzle 173.
5. The constant temperature-humidity oven according to claim 3, wherein the means for controlling the evaporating pressure of the refrigerant consist of a capillary tube 273 for inducing the high pressure evaporation of the refrigerant, a capillary tube 275 and a solenoid valve 276 connected to the capillary tube 273 in the state connected in parallel to the capillary tube 273.
6. The constant temperature-humidity oven according to claim 3, wherein the means for controlling the evaporating pressure of the refrigerant are a diaphragm-shaped needle valve 276, in which a stepping motor is installed, and the tubular nozzle 173 or the capillary tube 275 connected in parallel to the diaphragm- shaped needle valve 476.
7. The constant temperature-humidity oven according to claim 2, wherein the air conditioning unit further includes a means for controlling the flow quantity of the refrigerant for controlling the flow quantity of an in-flowed refrigerant, and a second evaporator 180 for dehumidifying arranged between the first evaporator 170 for dehumidifying and the humidifier 120, in which the refrigerant passed through the means for controlling the flow quantity of the refrigerant is flowed, connected between the inlet pipe R1 and the outlet pipe R2, respectively.
8. The constant temperature-humidity oven according to claim 2, wherein the air conditioning unit further includes a means for controlling the flow quantity of the refrigerant for controlling the flow quantity of an in-flowed refrigerant, a first humidifier evaporator 190 arranged on the surface of the fluid of the humidifier 120, in which the refrigerant passed through the means for controlling the flow quantity of the refrigerant is flowed, connected between the inlet pipe R1 and the outlet pipe R2, respectively, and a means for controlling the flow quantity of the refrigerant for controlling the flow quantity of an in-flowed refrigerant, and a second humidifier evaporator 200 arranged in the fluid of the humidifier 120, in which the refrigerant passed through the means for controlling the flow quantity of the refrigerant is flowed, serially connected between the inlet pipe R1 and the outlet pipe R2, respectively.
9. The constant temperature-humidity oven according to one of claims 2 through 8, wherein the means for controlling the flow quantity of the refrigerant consist of the tubular nozzle for constantly flowing the refrigerant and the solenoid valve serially connected to the tubular nozzle.
10. The constant temperature-humidity oven according to one of claims 2 through 8, wherein the means for controlling the flow quantity of the refrigerant consist of the capillary tube for constantly flowing the refrigerant and the solenoid valve serially connected to the capillary tube.
11. The constant temperature-humidity oven according to one of claims 2 through 8, wherein the means for controlling the flow quantity of the refrigerant is the diaphragm-shaped needle valve in which stepping motor is installed.
12. The constant temperature-humidity oven according to claim 1 , wherein the by-pass valve 240 consists of a tubular nozzle 241 or a capillary tube 341 for constantly flowing the refrigerant and a solenoid valve 242 serially connected to the tubular nozzle 241 or the capillary tube 341.
13. The constant temperature-humidity oven according to claims 1 , wherein the by-pass valve 240 is the diaphragm-shaped needle valve 540, in which the stepping motor is installed.
14. The constant temperature-humidity oven according to claim 1 , wherein the humidifier 120 includes a second heater 122 installed in the fluid.
PCT/KR2001/000152 2000-02-02 2001-02-02 Constant temperature-humidity oven Ceased WO2001057449A1 (en)

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AU2001232393A AU2001232393A1 (en) 2000-02-02 2001-02-02 Constant temperature-humidity oven

Applications Claiming Priority (2)

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KR1020000005247A KR100351731B1 (en) 2000-02-02 2000-02-02 Constant temperature-humidity oven
KR2000/5247 2000-02-02

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DE102006034290B3 (en) * 2006-07-21 2008-02-28 Labotect Gmbh Method and device for humidity control in a climatic chamber
CN100545535C (en) * 2007-03-19 2009-09-30 钟永村 Gas humidity removing device
CN104822245A (en) * 2015-05-14 2015-08-05 中山市默拜尔网络科技有限公司 Constant temperature maintaining structure of communication cabinet
CN105180331A (en) * 2015-10-30 2015-12-23 苏州腾辉环保科技有限公司 Anti-dry-burning evaporative humidifier
CN105180332A (en) * 2015-10-30 2015-12-23 苏州腾辉环保科技有限公司 Environment adjusting type evaporative humidifier with self-protective function
CN105202679A (en) * 2015-10-30 2015-12-30 苏州腾辉环保科技有限公司 High pressure micro-fog industrial humidifier with environment regulation function
CN105202681A (en) * 2015-10-30 2015-12-30 苏州腾辉环保科技有限公司 Evaporative type heater with environment regulation function
CN105222254A (en) * 2015-10-30 2016-01-06 苏州腾辉环保科技有限公司 A kind of intelligent safe evaporation type cool-down ventilation machine group
CN105222255A (en) * 2015-10-30 2016-01-06 苏州腾辉环保科技有限公司 A kind of environment-friendly type cool-down ventilation machine group with environmental modulation function
CN105276739A (en) * 2015-10-30 2016-01-27 苏州腾辉环保科技有限公司 Intelligent efficient ultrasonic atomization industrial humidifier
CN105387551A (en) * 2015-10-30 2016-03-09 苏州腾辉环保科技有限公司 High-safety evaporative cooling air exchange unit with protection function
JP2023102298A (en) * 2019-08-28 2023-07-24 エスペック株式会社 Humidifier and environmental test equipment
CN117339850A (en) * 2023-10-12 2024-01-05 江苏远航锦锂新能源科技有限公司 Temperature and humidity control system and method for lithium battery pole piece oven
JP7513953B2 (en) 2020-08-26 2024-07-10 株式会社大気社 Air Conditioning System

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Cited By (22)

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Publication number Priority date Publication date Assignee Title
DE102006034290B3 (en) * 2006-07-21 2008-02-28 Labotect Gmbh Method and device for humidity control in a climatic chamber
CN100545535C (en) * 2007-03-19 2009-09-30 钟永村 Gas humidity removing device
CN104822245A (en) * 2015-05-14 2015-08-05 中山市默拜尔网络科技有限公司 Constant temperature maintaining structure of communication cabinet
CN105387551A (en) * 2015-10-30 2016-03-09 苏州腾辉环保科技有限公司 High-safety evaporative cooling air exchange unit with protection function
CN105202681B (en) * 2015-10-30 2018-05-11 苏州腾辉环保科技有限公司 A kind of vaporation-type heater with environment regulatory function
CN105202679A (en) * 2015-10-30 2015-12-30 苏州腾辉环保科技有限公司 High pressure micro-fog industrial humidifier with environment regulation function
CN105202681A (en) * 2015-10-30 2015-12-30 苏州腾辉环保科技有限公司 Evaporative type heater with environment regulation function
CN105222254A (en) * 2015-10-30 2016-01-06 苏州腾辉环保科技有限公司 A kind of intelligent safe evaporation type cool-down ventilation machine group
CN105222255A (en) * 2015-10-30 2016-01-06 苏州腾辉环保科技有限公司 A kind of environment-friendly type cool-down ventilation machine group with environmental modulation function
CN105276739A (en) * 2015-10-30 2016-01-27 苏州腾辉环保科技有限公司 Intelligent efficient ultrasonic atomization industrial humidifier
CN105180331A (en) * 2015-10-30 2015-12-23 苏州腾辉环保科技有限公司 Anti-dry-burning evaporative humidifier
CN105202679B (en) * 2015-10-30 2018-05-11 苏州腾辉环保科技有限公司 A kind of high-pressure micro-mist industry humidifier with environment regulatory function
CN105180332A (en) * 2015-10-30 2015-12-23 苏州腾辉环保科技有限公司 Environment adjusting type evaporative humidifier with self-protective function
CN105222255B (en) * 2015-10-30 2018-05-11 苏州腾辉环保科技有限公司 A kind of environment-friendly type cool-down ventilation machine group with environment regulatory function
CN105180331B (en) * 2015-10-30 2018-05-11 苏州腾辉环保科技有限公司 A kind of anti-dry evaporative humidifier
CN105180332B (en) * 2015-10-30 2018-05-11 苏州腾辉环保科技有限公司 A kind of environment adjustment type evaporative humidifier with self-protection function
CN105222254B (en) * 2015-10-30 2018-07-10 苏州腾辉环保科技有限公司 A kind of safe evaporative cooling unit of intelligence
CN105276739B (en) * 2015-10-30 2018-07-10 苏州腾辉环保科技有限公司 A kind of ultrasonic fog chemical industry humidifier of Efficient intelligent
CN105387551B (en) * 2015-10-30 2018-07-13 苏州腾辉环保科技有限公司 A kind of high security evaporative cooling unit with defencive function
JP2023102298A (en) * 2019-08-28 2023-07-24 エスペック株式会社 Humidifier and environmental test equipment
JP7513953B2 (en) 2020-08-26 2024-07-10 株式会社大気社 Air Conditioning System
CN117339850A (en) * 2023-10-12 2024-01-05 江苏远航锦锂新能源科技有限公司 Temperature and humidity control system and method for lithium battery pole piece oven

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KR20010077452A (en) 2001-08-20
AU2001232393A1 (en) 2001-08-14

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