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US20160327313A1 - Direct Expansion Heat Recovery Method and Device - Google Patents

Direct Expansion Heat Recovery Method and Device Download PDF

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Publication number
US20160327313A1
US20160327313A1 US15/092,644 US201615092644A US2016327313A1 US 20160327313 A1 US20160327313 A1 US 20160327313A1 US 201615092644 A US201615092644 A US 201615092644A US 2016327313 A1 US2016327313 A1 US 2016327313A1
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Prior art keywords
condenser
evaporator
heat recovery
heat
compressor
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Abandoned
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US15/092,644
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English (en)
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Wei-Yi Chiang
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    • 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
    • F25B6/00—Compression machines, plants or systems, with several condenser circuits
    • F25B6/02—Compression machines, plants or systems, with several condenser circuits arranged in parallel
    • 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
    • F25B6/00—Compression machines, plants or systems, with several condenser circuits
    • 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
    • F25B2400/07—Details of compressors or related parts
    • F25B2400/075—Details of compressors or related parts with parallel compressors

Definitions

  • the present invention relates to an air-conditioning technology and, more particularly, to multiple direct expansion heat recovery energy-saving method and device for a working place with requirements of control of temperature and humidity.
  • a conventional direct expansion constant temperature and humidity system comprises a cooling and dehumidifying coil.
  • the cooling and dehumidifying coil performs cooling and dehumidifying procedures to cool and dehumidify the air in the room until the temperature of the air reaches a dew point temperature.
  • ambient supply air is introduced into the room to reduce the temperature and humidity of the air in the room simultaneously.
  • the temperature of the air in the room reaches a preset point faster than the humidity does during operation.
  • the cooling and dehumidifying coil continues to perform the dehumidifying procedure to dehumidify the air in the room.
  • the cooling and dehumidifying coil After the air in the room passes through the cooling and dehumidifying coil, it is necessary to provide a heater to heat the air so that the air in the room is kept at a constant value. When the humidity of the air in the room reaches a preset point, the cooling and dehumidifying coil is controlled to reduce its energy and to maintain a normal operation.
  • the compressor of the conventional direct expansion constant temperature and humidity system only has cooling and dehumidifying functions, without reheating and humidifying functions, so that it is necessary to additionally provide a heater and a humidifier to achieve the reheating and humidifying functions, thereby greatly limiting the versatility of the conventional direct expansion constant temperature and humidity system.
  • the heater wastes a large amount of electricity, thereby increasing the cost of operation of the conventional direct expansion constant temperature and humidity system.
  • a conventional heat exchanger can control the flow rate of the refrigerant (or air or water) to achieve a required heat conduction quantity or temperature and humidity conditions. For example, controlling the flow rate and the temperature differential of the primary fluid (that is, the refrigerant) of the heat exchanger can reach the required heat exchange quantity (high or low temperature). Alternatively, controlling the flow rate and the temperature differential of the secondary fluid (that is, the water or air) of the heat exchanger can reach the required heat exchange quantity (high or low temperature).
  • the refrigerant of the compressor injects a high pressure gas so that the flow rate is not controlled easily, and operation of the compressor is interfered when the flow rate and pressure of the refrigerant are changed.
  • the refrigerant system is not controlled easily, so that a secondary refrigerant system is provided, such as a brine system of refrigeration, a cold water system of air-conditioning or a hot water system of air-conditioning.
  • a secondary refrigerant system such as a brine system of refrigeration, a cold water system of air-conditioning or a hot water system of air-conditioning.
  • the secondary refrigerant provides cooling, dehumidifying and heating functions.
  • such a system has a complicated and large structure, thereby increasing the cost of fabrication.
  • the primary objective of the present invention is to provide a direct expansion heat recovery method comprising a complete refrigeration cycle including a compression process by a compressor, a condensing process by a condenser, a throttling process by an expansion valve, and an evaporation process by an evaporator.
  • a heat output process of a condensing process of the condenser includes providing at least two condensers which are connected serially.
  • a heat output required by a second condenser is to proportionally control a heat output of a first condenser, so as to precisely control the heat output required by the second condenser.
  • the second condenser functions as a heater or humidifier of heat recovery, without affecting a normal operation of the compressor.
  • a heat input process of an evaporation process of the evaporator includes providing at least two evaporators which are connected serially.
  • a heat input required by a second evaporator is to proportionally control a heat input of a first evaporator, so as to precisely control the heat input required by the second evaporator.
  • the second evaporator functions as a cooler and a dehumidifier, so that when a volume of the second evaporator is smaller than that of a heater of heat recovery, there is a heating effect at a high temperature, without affecting a normal operation of the compressor.
  • Another objective of the present invention is to provide a direct expansion heat recovery device comprising a compressor, a condenser, an expansion valve, and an evaporator which are connected to construct a complete refrigeration cycle.
  • the condenser includes a first condenser and a second condenser which are connected serially.
  • the evaporator includes a first evaporator and a second evaporator which are connected serially.
  • the condenser further includes a third condenser and a fourth condenser which are connected serially.
  • the serially connected third condenser and fourth condenser are connected in parallel with the serially connected first condenser and second condenser.
  • the direct expansion heat recovery device further comprises solenoid valves to control and start heating or humidifying functions of the heat recovery.
  • the fourth condenser is a humidifier.
  • the humidifier includes humidifying water, an external water source control unit, a high temperature refrigerant pipe, a compression air pipe, and an air compressor.
  • the external water source control unit is used to control a water level of the humidifying water.
  • the high temperature refrigerant pipe has a first end connected with the third condenser and a second end connected with the expansion valve, so that a heat recovery of the high temperature refrigerant supplied by the third condenser is used to heat the humidifying water to produce humidified air.
  • the compression air pipe is connected with the air compressor and uses a compressed air to produce air bubbles, to increase a contact area of the compressed air and the humidifying water, so as to enhance a humidifying quantity.
  • the direct expansion heat recovery device further comprises a second compressor connected in parallel with the compressor.
  • FIG. 1 is a graph showing a pressure and enthalpy relationship of a conventional refrigeration cycle in accordance with the prior art.
  • FIG. 2 is a graph showing a pressure and enthalpy relationship of a refrigeration cycle in accordance with the present invention.
  • FIG. 3 is a circuit diagram of a device in accordance with a first preferred embodiment of the present invention.
  • FIG. 4 is a circuit diagram of a device in accordance with a second preferred embodiment of the present invention.
  • FIG. 5 is a circuit diagram of a device in accordance with a third preferred embodiment of the present invention.
  • FIG. 6 is a schematic view of a humidifier of the device in accordance with the present invention.
  • FIG. 7 is a circuit diagram of a device in accordance with a fourth preferred embodiment of the present invention.
  • FIG. 8 is a circuit diagram of a device in accordance with a fifth preferred embodiment of the present invention.
  • FIG. 9 is a schematic operational view of the device as shown in FIG. 8 in use.
  • the present invention relates to a direct expansion heat recovery energy-saving method and a device which uses the method to have a cooling, dehumidifying, reheating and humidifying functions by a heat recovery.
  • a refrigeration cycle in accordance with the prior art comprises a compression process “a-b” (by a compressor), a condensing process “b-c” (by a condenser), a throttling process “c-d” (by an expansion valve), and an evaporation process “d-a” (by an evaporator).
  • a refrigeration cycle in accordance with the preferred embodiment of the present invention comprises a compression process “a-b” (by a compressor), a condensing process “b-c” (by a condenser), a throttling process “c-d” (by an expansion valve), and an evaporation process “d-a” (by an evaporator).
  • Q c is a constant under a fixed condition, so that precisely controlling the value of Q c1 can precisely control the value of Q c2 .
  • Q e is a constant under a fixed condition, so that precisely controlling the value of Q e1 can precisely control the value of Q e2 .
  • Q c1 and Q c2 are complementary, and Q e1 and Q e2 are complementary, so that Q c , Q e and W e are balanced easily, and the compressor will not fail due to abnormal conditions of high and low pressure.
  • At least two condensers (“CON 1 ” and “CON 2 ”) are connected serially.
  • Controlling the heat output Q c2 required by the second condenser is not to control the flow rate and temperature differential of the primary fluid (refrigerant) of the second condenser, but is to proportionally control the heat output Q c1 of the first condenser, that is, to form a point “X” along the line of the heat output process as shown in FIG. 2 , and to let the point “X” move leftward and rightward, so as to precisely control the heat output Q c2 required by the second condenser.
  • At least two evaporators (“EVP 1 ” and “EVP 2 ”) are connected serially.
  • Controlling the heat input Q e2 required by the second evaporator is not to control the flow rate and temperature differential of the primary fluid (refrigerant) of the second evaporator, but is to proportionally control the heat input Q e1 of the first evaporator, that is, to form a point “Y” along the line of the heat input process as shown in FIG. 2 , and to let the point “Y” move leftward and rightward, so as to precisely control the heat input Q e2 required by the second evaporator.
  • the direct expansion heat recovery energy-saving method of the present invention comprises a complete refrigeration cycle including a compression process by a compressor, a condensing process by a condenser, a throttling process by an expansion valve, and an evaporation process by an evaporator.
  • a complete refrigeration cycle including a compression process by a compressor, a condensing process by a condenser, a throttling process by an expansion valve, and an evaporation process by an evaporator.
  • the heat output required by the second condenser is to proportionally control the heat output of the first condenser, so as to precisely control the heat output required by the second condenser.
  • the second condenser functions as a heater or humidifier of heat recovery, without affecting the normal operation of the compressor.
  • the heat input required by the second evaporator is to proportionally control the heat input of the first evaporator, so as to precisely control the heat input required by the second evaporator.
  • the second evaporator functions as a cooler and a dehumidifier, so that when the volume of the second evaporator is smaller than that of the heater of heat recovery, the system has a heating effect at a high temperature, without affecting the normal operation of the compressor.
  • the direct expansion heat recovery energy-saving device of the present invention is used to overcome the shortcomings of the conventional direct expansion constant temperature and humidity system.
  • the conventional direct expansion constant temperature and humidity system only has cooling and dehumidifying functions without reheating and humidifying functions.
  • the direct expansion heat recovery energy-saving device of the present invention has cooling, dehumidifying, reheating and humidifying functions.
  • the direct expansion heat recovery energy-saving device of the present invention only needs to start the compressor to provide the cooling, dehumidifying, reheating and humidifying functions by the heat recovery.
  • the heat exchanger primarily relates to a heat exchanger of a refrigerant of a compressor refrigeration cycle.
  • the heat exchanger only relates to an evaporator and a condenser.
  • the evaporator and the condenser have different names at different positions, but the primary function (heat exchange function) of the evaporator and the condenser is not changed.
  • the cooling coil is also an evaporator
  • the heating coil is also a condenser
  • the humidifier is also a condenser.
  • the heat exchanger has an air-cooled type, that is, the refrigerant performs heat exchange with the air.
  • the heat exchanger may have a water-cooled type, that is, the refrigerant performs heat exchange with the water.
  • the air-cooled fan is a fan with an axial flow.
  • the air-cooled fan is a centrifugal fan.
  • a direct expansion heat recovery energy-saving device in accordance with the preferred embodiment of the present invention comprises a compressor “COM”, a condenser “CON”, an expansion valve “EXP”, and an evaporator “EVP” which are connected to construct a complete refrigeration cycle.
  • the condenser “CON” includes a first condenser “CON 1 ” and a second condenser “CON 2 ” which are connected serially. Controlling the heat output required by the second condenser “CON 2 ” is to proportionally control the heat output of the first condenser “CON 1 ”, so as to precisely control the heat output required by the second condenser “CON 2 ”.
  • the second condenser “CON 2 ” functions as a heater of the heat recovery, without affecting the normal operation of the compressor “COM”. Namely, the direct expansion heat recovery energy-saving device of the present invention only needs to start the compressor “COM” to provide the cooling, dehumidifying and heating functions by means of the heat recovery. Thus, the direct expansion heat recovery energy-saving device of the present invention is available for an industry needing the conditions of low humidity and constant temperature (lower temperature), such as a warehouse that stores foods and needs a low temperature manufacturing procedures.
  • the second condenser “CON 2 ” may be a heating coil “HC”, and the evaporator “EVP” may be a cooling coil “CC”.
  • the evaporator “EVP” includes a first evaporator “EVP 1 ” and a second evaporator “EVP 2 ” which are connected serially. Controlling the heat output required by the second condenser “CON 2 ” is to proportionally control the heat output of the first condenser “CON 1 ”, so as to precisely control the heat output required by the second condenser “CON 2 ”.
  • the second condenser “CON 2 ” functions as a heater of heat recovery, without affecting the normal operation of the compressor “COM”.
  • the heat input required by the second evaporator “EVP 2 ” is to proportionally control the heat input of the first evaporator “EVP 1 ”, so as to precisely control the heat input required by the second evaporator “EVP 2 ”.
  • the second evaporator “EVP 2 ” functions as a cooler and a dehumidifier, so that when the volume of the second evaporator “EVP 2 ” is smaller than that of the heater of the heat recovery, the system has a heating effect at a high temperature, without affecting the normal operation of the compressor “COM”.
  • the direct expansion heat recovery energy-saving device of the present invention only needs to start the compressor “COM” to provide the cooling, dehumidifying and heating functions by means of the heat recovery.
  • the direct expansion heat recovery energy-saving device of the present invention is available for an industry needing the conditions of low humidity and constant temperature (higher temperature), such as a warehouse that stores foods and needs a low temperature manufacturing procedures.
  • the second evaporator “EVP 2 ” may be a cooling coil “CC”.
  • the condenser “CON” further includes a third condenser “CON 3 ” and a fourth condenser “CON 4 ” which are connected serially.
  • the serially connected third condenser “CON 3 ” and fourth condenser “CON 4 ” are connected in parallel with the serially connected first condenser “CON 1 ” and second condenser “CON 2 ”.
  • the direct expansion heat recovery energy-saving device further comprises solenoid valves “S” to control and start the heating or humidifying functions of the heat recovery. Namely, the direct expansion heat recovery energy-saving device of the present invention only needs to start the compressor “COM” to provide the cooling, dehumidifying, heating and humidifying functions by means of the heat recovery.
  • the direct expansion heat recovery energy-saving device of the present invention is available for an industry needing the conditions of constant temperature and humidity, such as a computer room, an electronic constant temperature and humidity machine, or a shell mold drying process of lost wax casting.
  • the fourth condenser “CON 4 ” is a humidifier “HR”.
  • the humidifier “HR” primarily includes humidifying water, an external water source control unit “HRA”, a high temperature refrigerant pipe “HRB”, a compression air pipe “HRC”, and an air compressor “HRD”.
  • the external water source control unit “HRA” is used to control the water level of the humidifying water.
  • the high temperature refrigerant pipe “HRB” has a first end connected with the third condenser “CON 3 ” and a second end connected with the expansion valve “EXP”, so that the heat recovery of the high temperature refrigerant supplied by the third condenser “CON 3 ” can heat the humidifying water to produce humidified air.
  • the compression air pipe “HRC” is connected with the air compressor “HRD” and uses the compressed air to produce air bubbles, to increase the contact area of the air and the water, so as to enhance the humidifying quantity. It is to be noted that, the temperature of the high temperature refrigerant supplied by the third condenser “CON 3 ” is not high enough to evaporate the water efficiently, so that it is necessary to provide an aerator, that is, the compression air pipe “HRC” and the air compressor “HRD”, so as to increase the heat exchange area of the air and the water.
  • the calculation formula is described as follows.
  • Calculation of the humidifying quantity of the humidifier “HR” of the heat recovery of the present invention has the following conditions.
  • the water evaporates from a water surface in an open water tank, depending on a saturated humidity ratio corresponding to a water temperature, a humidity ratio in the air, the contact area (containing the water surface and under the water surface) of the air and the water, and the air velocity above the water surface.
  • the quantity of the evaporated water is expressed by:
  • the direct expansion heat recovery energy-saving device of the present invention further comprises a second compressor “COM 2 ” connected in parallel with the compressor “COM”.
  • the device is a water-cooled double compressor heat recovery device which only needs to start the compressor to provide the cooling, dehumidifying, heating and humidifying functions by means of the heat recovery.
  • the water-cooled double compressor heat recovery device of the present invention is available for an industry needing the conditions of constant temperature and humidity, such as a computer room, an electronic constant temperature and humidity machine, or a shell mold drying process of lost wax casting.
  • the condenser “CON” further includes a third condenser “CON 3 ” and a fourth condenser “CON 4 ” which are connected serially.
  • the serially connected third condenser “CON 3 ” and fourth condenser “CON 4 ” are connected in parallel with the serially connected first condenser “CON 1 ” and second condenser “CON 2 ”.
  • the direct expansion heat recovery energy-saving device further comprises solenoid valves “S” to control and start the heating or humidifying functions of the heat recovery.
  • the direct expansion heat recovery energy-saving device of the present invention only needs to start the compressor “COM” to provide the cooling, dehumidifying, heating and humidifying functions by means of the heat recovery.
  • the direct expansion heat recovery energy-saving device of the present invention is available for an industry needing the conditions of constant temperature and humidity, such as a computer room, an electronic constant temperature and humidity machine, a sauna chamber, or a shell mold drying process of lost wax casting.
  • the direct expansion heat recovery energy-saving device of the present invention further comprises an air conditioner unit 1 and an exterior constant temperature and humidity space 2 connected with the air conditioner unit 1 .
  • the air conditioner unit 1 is divided into an equipment space 10 and an interior constant temperature and humidity space 11 for mounting all of the above-mentioned parts of the present invention.
  • the interior constant temperature and humidity space 11 is provided with a supply fan “SF” connected with a supply air outlet “SA” of the exterior constant temperature and humidity space 2 .
  • the exterior constant temperature and humidity space 2 has a return air outlet “RA” connected with the interior constant temperature and humidity space 11 .
  • the direct expansion heat recovery energy-saving device of the present invention directly recycles the high temperature of the refrigerant exactly into the temperature and humidity conditions required by the system, so as to completely replace the electric heater or humidifier in the present market.
  • the direct expansion heat recovery energy-saving device of the present invention has a simplified structure and is controlled easily and stably, so that it is the optimum choice for a direct expansion constant temperature and humidity system.
  • the direct expansion heat recovery energy-saving device of the present invention is available for a basic circulation system with one-stage compression and one-stage expansion.
  • the direct expansion heat recovery energy-saving device of the present invention is also available for a multiple compressor parallel connection system, a multi-stage compressor system, a refrigerant circuit parallel connection system, a multi-stage expansion system, or a multiple refrigerant system.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)
US15/092,644 2015-05-07 2016-04-07 Direct Expansion Heat Recovery Method and Device Abandoned US20160327313A1 (en)

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Application Number Priority Date Filing Date Title
TW104114634A TWI564525B (zh) 2015-05-07 2015-05-07 Energy saving method and device for direct heat recovery
TW104114634 2015-05-07

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Cited By (4)

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CN109757918A (zh) * 2019-01-09 2019-05-17 青岛海尔空调器有限总公司 能源系统、能源系统的控制方法及装置、存储介质
CN109757919A (zh) * 2019-01-09 2019-05-17 青岛海尔空调器有限总公司 一种能源系统的控制方法
US20190323761A1 (en) * 2018-04-24 2019-10-24 Wei-Yi Chiang Dehumidifying Device with Temperature Control
CN111256382A (zh) * 2018-11-30 2020-06-09 中国化学工业桂林工程有限公司 一种工业废热回收利用系统

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CN110529931A (zh) * 2019-07-25 2019-12-03 珠海格力电器股份有限公司 一种空调系统

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190323761A1 (en) * 2018-04-24 2019-10-24 Wei-Yi Chiang Dehumidifying Device with Temperature Control
CN111256382A (zh) * 2018-11-30 2020-06-09 中国化学工业桂林工程有限公司 一种工业废热回收利用系统
CN109757918A (zh) * 2019-01-09 2019-05-17 青岛海尔空调器有限总公司 能源系统、能源系统的控制方法及装置、存储介质
CN109757919A (zh) * 2019-01-09 2019-05-17 青岛海尔空调器有限总公司 一种能源系统的控制方法

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TW201640065A (zh) 2016-11-16

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