JP2014002118A - Environmental test device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an environmental test device 10 which comprises a cooling heat exchanger 22 for cooling and dehumidifying air, a heater 23 for heating air, and a humidifier 21 for humidifying air and controls the temperature and humidity of air in a test chamber C1 to a target temperature and a humidity to save energy while in steady operation in which control amounts are small.SOLUTION: An environmental test device comprises an evaporator in a cooling circuit as a main cooling heat exchanger 31 and is provided with an auxiliary cooling heat exchanger 32 of which heat capacity is smaller than that of the main cooling heat exchanger 31, with the auxiliary cooling heat exchanger 32 being constituted of an electronic cooler 33 such as a Peltier effect element.

Description

  The present invention relates to an environmental test apparatus such as a constant temperature and humidity chamber, and more particularly to a technique for performing an energy saving operation.

  Conventionally, in order to test the performance of a product under conditions of a predetermined temperature and a predetermined humidity when performing a stability test of pharmaceuticals and the like, for example, an environmental test apparatus such as a constant temperature and humidity chamber has been used. In such an environmental test apparatus, a temperature sensor and a humidity sensor are provided in a test chamber of a thermo-hygrostat surrounded by a heat insulating wall, and an air conditioner including a refrigerator, a humidifier, and a heater is based on these measured values. I have control. By doing so, air is circulated between the test chamber of the constant temperature and humidity chamber and the air conditioner so that the temperature and humidity in the test chamber are kept constant at the target temperature and humidity (see, for example, Patent Document 1). ).

  In the above-described environmental test apparatus, in general, an evaporator of a refrigerant circuit that performs a refrigeration cycle is used for air cooling and dehumidification, and a heater and a humidifier provided separately from the refrigerant circuit are used to generate air at a target temperature and humidity. It is trying to generate.

JP-A-7-140061

  By the way, in a constant temperature and humidity chamber, energy consumption may become large even if it enters into a steady operation and the amount of dehumidification is small. As a specific example, for example, in the air diagram of FIG. 6, a case where humidity is adjusted from a point A indicating the current air state to a target point D will be considered.

  In this case, first, air is cooled by the evaporator of the refrigerant circuit from the current point A to point B on the saturated water vapor pressure curve. When the air is cooled to point B, condensation occurs in the evaporator. Furthermore, cooling the air to point C reduces the temperature and humidity. And if air is heated with the heater from the point C to the point D, the air of target temperature / humidity will be obtained.

In the above method, a large amount of energy is consumed both in the process of cooling air from point A to point C and in the process of heating air from point C to point D, although the control amount of absolute humidity is small. , Driving efficiency will be reduced. At this time, the amount of cooling air to the mass M, point enthalpy difference of A and point C is _{H C -H A = M (h} C -h A) , and the fact that the energy is consumed in proportion to become.

  The present invention has been made in view of such problems, and an object thereof is to enable energy saving during steady operation with a small control amount in an environmental test apparatus such as a constant temperature and humidity chamber. .

  The first invention includes a cooling heat exchanger that cools and dehumidifies air, a heater that heats air, and a humidifier that humidifies air, and sets the temperature and humidity of the air in the test room to a target temperature and humidity. Assume an environmental testing device configured to control.

  The environmental test apparatus includes a main cooling heat exchanger constituted by an evaporator of a refrigerant circuit and an auxiliary cooling heat exchanger having a smaller heat capacity than the main cooling heat exchanger. It is characterized by comprising an electronic cooler. The “cooling heat exchanger” means a heat exchanger that also performs dehumidification by cooling air.

  In the first invention, the air in the test chamber is cooled and dehumidified by the main cooling heat exchanger, and the temperature and humidity of the test chamber are adjusted by adjusting the temperature and humidity of the air by the heater and the humidifier. The value can be controlled. On the other hand, the auxiliary cooling heat exchanger has a smaller heat capacity and a smaller heat exchange area than the main cooling heat exchanger. Therefore, the input to the auxiliary cooling heat exchanger can be reduced. In addition, in the main cooling heat exchanger with a large heat exchange area, if the cooling capacity is reduced, dew condensation may not occur on the surface of the heat exchanger and dehumidification may not be performed, whereas auxiliary cooling with a small heat exchange area. If a heat exchanger is used, dehumidification is possible even at low output.

  In a second aspect based on the first aspect, the auxiliary cooling heat exchanger includes a first auxiliary cooling heat exchanger and a second auxiliary cooling heat exchanger, and the first auxiliary cooling heat exchanger and the second auxiliary cooling are included. The exchanger is characterized in that any one of them is configured as an air cooler alternately.

  In the second aspect of the invention, the air is cooled and dehumidified by alternately using the first auxiliary cooling heat exchanger and the second auxiliary cooling heat exchanger. For example, when the first auxiliary cooling heat exchanger is on the cooling side, the second auxiliary cooling heat exchanger can be stopped or operated at a low capacity, or can be on the heat dissipation side, and the second auxiliary cooling heat exchanger can be cooled. When it becomes a heat exchanger, the first auxiliary cooling heat exchanger can be stopped or operated with low capacity, or can be on the heat dissipation side.

  According to a third aspect of the present invention, in the second aspect, under the operating conditions where the auxiliary cooling heat exchanger frosts, either the first auxiliary cooling heat exchanger or the second auxiliary cooling heat exchanger is an air cooler. The operation mode in which defrosting is performed on the other side is configured to be possible.

  In the third aspect of the invention, when the first auxiliary cooling heat exchanger is on the cooling dehumidifying side, the second auxiliary cooling heat exchanger is on the defrost side, and when the second auxiliary cooling heat exchanger is on the cooling side, the first auxiliary cooling heat exchanger is on the cooling side. The heat exchanger can be on the defrost side. In this configuration, the auxiliary cooling heat exchanger on the defrost side may perform a heat radiation operation, may gradually defrost by stopping the cooling operation, or may continue cooling slightly. Thus, defrosting may be performed at the same time while cooling with low capacity.

  According to a fourth invention, in the first, second or third invention, the electronic cooler is constituted by a Peltier effect element, the first electric heating surface of the Peltier effect element faces the inside of the machine, and the second electric heating surface is the machine. It is characterized by being configured to face the outside.

  In the fourth aspect of the invention, when the first heating surface of the auxiliary cooling heat exchanger is used as a cooling surface, an operation for cooling and dehumidifying air becomes possible, and heat radiation is performed on the air outside the apparatus.

  According to the present invention, the evaporator of the refrigerant circuit is the main cooling heat exchanger, while the auxiliary cooling heat exchanger having a smaller heat capacity than that of the main cooling heat exchanger is provided. A small amount of auxiliary cooling heat exchanger during steady operation can be used properly. When the auxiliary cooling heat exchanger is used, it is possible to perform a dehumidifying operation at a low output, which is difficult with a main cooling heat exchanger having a large cooling capacity, and energy saving can be realized.

  According to the second invention, the first auxiliary cooling heat exchanger and the second auxiliary cooling heat exchanger are alternately used to cool and dehumidify the air, while the other auxiliary cooling heat exchanger is stopped or has a low capacity. Since it is possible to perform the operation or to perform the operation to the heat radiation side, for example, the air can be cooled and dehumidified simultaneously while defrosting the frosted auxiliary cooling heat exchanger. In the configuration using only the main cooling heat exchanger of the refrigerant circuit, the continuous operation may stop when the main cooling heat exchanger is frosted, whereas according to the second invention, the auxiliary cooling is performed. Continuous operation is possible by using two heat exchangers alternately. The second aspect of the invention includes a defrost operation when the auxiliary cooling heat exchanger is used alternately. However, if the defrost operation is not necessary depending on the operation condition, the auxiliary cooling heat exchanger that does not become the cooling side is stopped or The cooling operation may be performed with a low capacity.

  According to the third aspect of the invention, the first auxiliary cooling heat exchanger and the second auxiliary cooling heat exchanger are alternately used to cool and dehumidify the air while the other auxiliary cooling heat exchanger is set to the defrost side. Therefore, the air can be cooled and dehumidified while defrosting the frosted auxiliary cooling heat exchanger. And like 2nd invention, in the structure using only the main cooling heat exchanger of a refrigerant circuit, when a main cooling heat exchanger frosts, continuous operation will stop, In this 3rd invention However, continuous operation is possible by using two auxiliary cooling heat exchangers alternately.

  According to the fourth aspect of the invention, when the first heating surface of the auxiliary cooling heat exchanger is used as the cooling surface, the operation of cooling and dehumidifying the air becomes possible, and the heat radiation is performed on the air outside the apparatus. It is possible to prevent the air temperature from rising more than necessary.

FIG. 1A is a central longitudinal sectional view showing a constant temperature and humidity chamber of an environmental test apparatus according to an embodiment of the present invention, and FIG. 1B is a sectional view taken along line BB of FIG. FIG. 2 is a flowchart showing the operation of the environmental test apparatus of FIG. FIG. 3A is an explanatory diagram showing the temperature change of the air by the main cooling heat exchanger, and FIG. 3B is an explanatory diagram showing the temperature change of the air by the auxiliary cooling heat exchanger. FIG. 4A is a central longitudinal sectional view showing a constant temperature and humidity chamber of an environmental test apparatus according to another embodiment, and FIG. 4B is a sectional view taken along line BB in FIG. It is a flowchart which shows the modification of the driving | running operation | movement of an environmental test apparatus. It is an air line figure which shows the dehumidification operation | movement by the dew condensation of a cooling heat exchanger.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  The present embodiment relates to a constant temperature and humidity chamber 11 of an environmental test apparatus 10 used for a stability test of pharmaceuticals and the like. FIG. 1A is a central longitudinal sectional view showing a constant temperature and humidity chamber 11 of the environmental test apparatus 10, and FIG. 1B is a sectional view taken along line BB of FIG. 1A. This constant temperature and humidity chamber 11 is a rectangular parallelepiped box fixed on the base 12, in order to maintain the temperature and humidity in the following test chamber C <b> 1 formed inside within a preset range. Used for.

  The constant temperature and humidity chamber 11 includes a front plate 13 provided with a door 13a, a back plate 14 facing the front plate 13, side plates 15 and 16 on both left and right sides, a top plate 17 positioned at the upper end of the box, And a bottom plate 18 located at the lower end. Inside the constant temperature and humidity chamber 11, there is provided a partition plate 18 that divides the inside of the constant temperature and humidity chamber 11 into a test chamber C1 located on the front side and an air conditioning chamber C2 located on the back side.

  A shelf (not shown) that divides the inside of the test chamber C1 into a plurality of stages is provided inside the test chamber C1. When the door 13a of the constant temperature and humidity chamber 11 is opened, the test chamber C1 inside the constant temperature and humidity chamber 11 is opened so that a sample can be put in the test chamber C1 and a sample in the test chamber C1 can be taken out. It has become.

  In the air conditioning room C2, a humidifier 21, a cooling heat exchanger 22, a heater 23, and a fan 24 are arranged in order from the bottom to the top. Further, an air outlet plate 25 having an air outlet 25 a is provided on the upper portion of the fan 24. By the fan 24, the air in the test chamber C1 is sucked into the air conditioning chamber C2 from below, the temperature and humidity are adjusted, and conditioned air is blown out from above the air conditioning chamber C2. In this way, air circulates between the test chamber C1 and the air conditioning chamber C2.

  The humidifier 21 includes a heater 21a and a tray 21b that stores water for humidification. The heater 21a heats the water for humidification with a heating amount corresponding to the supplied electric energy. Water is supplied to the receiving tray 21b from a water supply tank (not shown) provided outside the test chamber C1. And the humidifier 21 performs the operation | movement which humidifies air by evaporating the water stored by the receiving tray 21b with the heater 21a based on the control signal output from the controller 40 mentioned later. Thereby, the humidifier 21 humidifies the inside of the test chamber C1 with the humidification amount according to the supplied electric energy.

  The cooling heat exchanger 22 is a heat exchanger that cools and dehumidifies air, and includes a main cooling heat exchanger 31 and an auxiliary cooling heat exchanger 32 having a smaller heat capacity than the main cooling heat exchanger 31. . The main cooling heat exchanger 31 is constituted by an evaporator of a refrigerant circuit that performs a vapor compression refrigeration cycle, and is disposed so as to be entirely located inside the air conditioning chamber C2. Moreover, what is necessary is just to install suitably other components, such as a compressor of a refrigerant circuit, and a condenser, outside the machine.

  In the present embodiment, the main cooling heat exchanger 31 is mainly used at the start of operation or when the temperature and humidity greatly deviate from the target set value for some reason, and during most of the operation, auxiliary cooling heat exchange is performed. A vessel 32 is used.

  The auxiliary cooling heat exchanger 32 is constituted by an electronic cooler. Specifically, the auxiliary cooling heat exchanger includes a Peltier effect element 33 that is an electronic cooler, a first fin 34 provided on the first electrothermal surface 33 a of the Peltier effect element 33, and a second Peltier effect element 33. It has the 2nd fin 35 provided in the electrothermal surface 33b. The auxiliary cooling heat exchanger 32 is arranged such that the first electric heating surface 33a faces the air conditioning chamber C2 in the apparatus and the second electric heating surface 33b faces the outside space.

  The auxiliary cooling heat exchanger 32 includes a first auxiliary cooling heat exchanger 32a and a second auxiliary cooling heat exchanger 32b that are positioned in parallel with the air flow direction in the air conditioning chamber C2. The first auxiliary cooling heat exchanger 32a and the second auxiliary cooling heat exchanger 32b are configured in the same manner. The first auxiliary cooling heat exchanger 32a and the second auxiliary cooling exchanger are configured to be a cooler that alternately cools and dehumidifies air. That is, when the first electric heating surface 33a of the first auxiliary cooling heat exchanger 32a becomes the cooling surface, the second auxiliary cooling heat exchanger 32b stops or dissipates heat at the first electric heating surface 33a, and the second auxiliary heating heat exchanger 32a When the first electric heating surface 33a of the cooling heat exchanger 32b becomes a cooling surface, the first auxiliary cooling heat exchanger 32a stops or dissipates heat at the first electric heating surface 33a.

  In particular, under the operating conditions in which the auxiliary cooling heat exchanger 32 is frosted, when one of the first auxiliary cooling heat exchanger 32a and the second auxiliary cooling heat exchanger 32b is an air cooler, defrost is performed on the other. Operation mode is enabled. In this operation mode, when the first electric heating surface 33a of the first auxiliary cooling heat exchanger 32a becomes a cooling surface, the first electric heating surface 33a of the second auxiliary cooling heat exchanger 32b becomes a heat dissipation surface, When the first electric heating surface 33a of the auxiliary cooling heat exchanger 32b becomes a cooling surface, the state can be switched between the first electric heating surface 33a of the first auxiliary cooling heat exchanger 32a becoming a heat dissipation surface.

  Note that the auxiliary cooling heat exchangers 32a and 32b on the defrost side are not only switched to the heat radiation side, but can be slowly defrosted even if they are stopped. Further, even if the auxiliary cooling heat exchangers 32a and 32b on the defrost side continue to operate with a slight cooling capacity, it is possible to perform the defrosting simultaneously while continuing the cooling operation slightly.

  The cooling heat exchanger 22 (the main cooling heat exchanger 31 and the auxiliary cooling heat exchanger 32) performs an operation of reducing the air flowing through the air conditioning chamber C2 to a dew point temperature calculated based on the set temperature and the set humidity. . As a result, a necessary amount of water at the set temperature and set humidity is secured. This control is performed in consideration of the operation amount of the temperature and humidity by the humidifier 21 and the heater 23.

  The heater 23 is, for example, an electric heater, and performs an operation of raising the air cooled by the cooling heat exchanger 22 to a set temperature based on a control signal output from the controller 40 described later. Thereby, the heater 23 heats the inside of the test chamber C1 with the heating amount according to the supplied electric energy.

  The fan 24 operates so as to circulate conditioned air whose temperature and humidity are adjusted by the humidifier 21, the cooling heat exchanger 22, and the heater 23 in the test chamber C1. In this way, the air in the test chamber C1 is circulated by the fan 24, and the humidifier 21, the cooling heat exchanger 22, and the heater 23 are operated as necessary, so that the temperature and humidity in the test chamber C1 can be controlled. It is stably maintained within a preset range. A temperature / humidity sensor is provided in the test chamber C1, and feedback control based on, for example, a detection value is performed.

  In order to control the operation of each device such as the humidifier 21, the cooling heat exchanger 22, the heater 23, and the fan 24 provided in the air conditioning room C2, the controller 12 is provided on the base 12. The controller 40 is connected to each of the devices 21, 22, 23, and 24 provided in the air-conditioning room C2, and has a temperature sensor (not shown) provided in the test room C1 and a constant temperature and humidity. It is connected to the input part (not shown) of the operation panel provided in the tank 11. The controller 40 controls the humidifier 21, the cooling heat exchanger 22, and the heater 23 based on the input setting signal and the detected temperature of the test chamber C1, and the temperature and humidity of the air in the test chamber C1 are targeted. Adjusted to temperature and humidity.

-Driving action-
Next, the operation state of the environmental test apparatus 10 will be described with reference to the flowchart of FIG.

  When control is started, the temperature and humidity of the test chamber C1 are measured in step ST1 and step ST2. In step ST3, convergence determination is performed, and it is determined whether or not the measured temperature and humidity have converged within a predetermined temperature and humidity range with respect to the set temperature and humidity.

  If the determination result is “NO”, the air is cooled and dehumidified by the main cooling heat exchanger 31 (refrigerant refrigerator) in step ST4, and the temperature and humidity are adjusted by the humidifier 21 and the heater 23 in steps ST5 and ST6. To return to step ST1.

  If the determination result in step ST3 is “YES”, the room temperature of the test chamber C1 converges to a predetermined temperature range with respect to the set value and enters a steady operation. In this case, the process proceeds to step ST7. In this steady operation, the main cooling heat exchanger 31 is stopped, and the cooling and dehumidifying operation by the auxiliary cooling heat exchanger 32 is performed.

  The reason why the auxiliary cooling heat exchanger 32 is used in the steady operation is as follows.

First, as shown in FIG. 3A, when the temperature and humidity of the test chamber C1 have not converged to the set values, the main cooling heat exchanger 31 is used as described above. At this time, the temperature of the air flowing into the main heat exchanger 31 and T _1, when the temperature decreases as [Delta] T, the temperature T ₂ of the air flowing out of the cooling heat exchanger 22, and T 2 ₌ T ₁ -ΔT Become. The heat exchange area of the main cooling heat exchanger 31 is S.

On the other hand, if the heat exchange area s of the auxiliary cooling heat exchanger 32 used during steady operation is s = αS (where α <1), the air temperature does not decrease in the main cooling heat exchanger 31 during steady operation, and the auxiliary the air temperature only the cooling heat exchanger 32 is lowered, the temperature _{T 3} of the air flowing out of the cooling heat exchanger 22 _{becomes T} 3 ₌ T 1 -αΔT. Therefore, the temperature becomes higher than that when the main cooling heat exchanger 31 is used, and the dehumidification amount is also reduced accordingly. The ratio of the heat exchange area between the main cooling heat exchanger 31 and the auxiliary cooling heat exchanger 32 is not simply proportional to the heat capacity or cooling capacity of the main cooling heat exchanger 31 and the auxiliary cooling heat exchanger 32. Here, it is assumed to be roughly proportional. Note that the heat exchange area of the auxiliary cooling heat exchanger 32 is determined based on the cooling capacity required during steady operation.

  Thus, the cooling and dehumidifying capacity can be reduced by using the auxiliary cooling heat exchanger 32 during steady operation. In general, when air is dehumidified by dew condensation in a heat exchanger, if the capacity of the heat exchanger is reduced too much, dew condensation cannot occur without dew condensation. Since it does not stop, dehumidification is not disabled.

  The steady operation is a state in which the temperature and humidity in the test chamber C1 are converged within a predetermined range. Therefore, rapid cooling and rapid dehumidification are not necessary, and the operation using the auxiliary cooling heat exchanger 32 is performed. Even so, it is sufficient to keep the temperature and humidity at the set values. Further, if the capacity of the heat exchanger is too large, there is a risk that hunting is likely to occur in the control. However, with the auxiliary cooling heat exchanger 32 of the present embodiment, stable operation with reduced hunting is performed.

  Returning to the flowchart of FIG. 2, the flow of operations after step ST7 will be described. In step ST7, the frosting state of the auxiliary cooling heat exchanger 32 is determined. If the auxiliary cooling heat exchanger 32 is frosted, an operation of switching between the cooling side and the defrosting side is executed in step ST8, and the process proceeds to step ST9 and after. If not, the auxiliary cooling heat exchanger 32 is switched. Without proceeding to step ST9. In the defrost operation, the auxiliary cooling heat exchanger 32 on the defrosting side may be de-energized and stopped to perform defrosting by a gradual temperature rise, or the auxiliary cooling heat exchanger 32 on the defrosting side Defrosting may be performed relatively quickly by switching the direction of voltage application so that one electrothermal surface 33a is on the heat radiation side. What is necessary is just to set control of the auxiliary | assistant cooling heat exchanger 32 by the side of a defrost so that a defrosting effect may be acquired in the range which does not disturb an air-conditioning characteristic.

  In step ST9, the temperature and humidity are controlled by the auxiliary cooling heat exchanger 32 on the dehumidifying cooling side. In steps ST10 and ST11, the temperature and humidity are adjusted by the humidifier 21 and the heater 23, and the process returns to step ST1.

-Effect of the embodiment-
According to the present embodiment, the auxiliary cooling heat exchanger 32 is provided in addition to the main cooling heat exchanger 31, and air is cooled and dehumidified by the auxiliary cooling heat exchanger 32 having a small heat exchange area during steady operation. . Since the auxiliary cooling heat exchanger 32 has a smaller heat capacity than the main cooling heat exchanger 31, the temperature of the auxiliary cooling heat exchanger 32 is changed, so that less input is required and power consumption is reduced. In addition, if a heat exchanger with a large cooling capacity is used during steady operation at a low output, the air may not be dehumidified without causing condensation on the surface of the heat exchanger, whereas the auxiliary cooling heat exchanger 32 is used. As a result, dehumidification can be reliably performed even during steady operation, and energy consumption at that time is also reduced.

  Further, although the evaporator of the refrigerant circuit is not suitable for a low output heat exchanger (main cooling heat exchanger 31), in this embodiment, a low output auxiliary cooling heat exchange is performed using the Peltier effect element 33. The device 32 can be easily put into practical use.

  Moreover, when the setting conditions of the test chamber C1 are low temperature and low humidity, it is easy to form frost on the surface of the auxiliary cooling heat exchanger 32. Under such conditions, the first auxiliary cooling heat exchanger 32a and the second auxiliary cooling heat are used. It is effective to operate the exchanger 32b by alternately switching between the cooling and dehumidifying side and the defrosting side. For example, when the setting condition is 10 ° C. and 50% RH, the dew point temperature is 0 ° C., and when the temperature is 5 ° C. and 60% RH, the dew point temperature is −2 ° C. and frost formation is likely to occur. Even under low-temperature and low-humidity operating conditions, switching between the two auxiliary cooling heat exchangers 32 enables continuous operation.

<< Other Embodiments >>
About the said embodiment, it is good also as the following structures.

  For example, in the said embodiment, you may change the position and shape of the humidifier 21 of FIG. 1 like the humidifier 26 shown in FIG. The humidifier 26 in FIG. 4 is a water spray type humidifier 26. Even with this configuration, it is possible to obtain air having the desired temperature and humidity on the outlet side of the fan 24.

  Further, in FIG. 1, the interval between the main cooling heat exchanger 31 and the heater 23 is widened, and the auxiliary cooling heat exchanger 32 is shifted upward in FIG. 1 so as to be positioned downstream of the main cooling heat exchanger 31. It may be arranged (not shown). Even if comprised in this way, it is possible to acquire the effect similar to the said embodiment.

  Further, the frosting state determination in step ST7 shown in the flowchart of FIG. 2 can be specifically determined based on the time period as shown in step ST7 'of FIG. In this case, a time period in which frost formation is likely to occur is determined in advance according to the temperature and humidity setting conditions, and the auxiliary cooling heat exchanger 32 is preferably switched between the cooling and dehumidifying side for each time period.

  In addition to using a time period, the frost determination is performed by providing a photoelectric sensor in the vicinity of the auxiliary cooling heat exchanger 32 and detecting a change in the reflection state of light in the auxiliary cooling heat exchanger 32. You may make it discriminate | determine.

  In addition, when the environmental test apparatus 10 is used under operating conditions in which frost formation does not occur in the auxiliary cooling heat exchanger 32, the number of auxiliary cooling heat exchangers 32 may be one instead of two.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or its use.

  As described above, the present invention is useful for a technique for performing an energy saving operation of an environmental test apparatus such as a constant temperature and humidity chamber.

DESCRIPTION OF SYMBOLS 10 Environmental test apparatus 11 Constant temperature and humidity tank 21 Humidifier 22 Cooling heat exchanger 23 Heater 31 Main cooling heat exchanger 32 Auxiliary cooling heat exchanger 32a 1st auxiliary cooling heat exchanger 32b 2nd auxiliary cooling heat exchanger 33 Peltier Effect element (electronic cooler)
33a First heating surface 33b Second heating surface C1 Test chamber

Claims (4)

A cooling heat exchanger that cools and dehumidifies the air, a heater that heats the air, and a humidifier that humidifies the air, and is configured to control the temperature and humidity of the test room air to the target temperature and humidity. Environmental testing equipment,
The cooling heat exchanger includes a main cooling heat exchanger constituted by an evaporator of a refrigerant circuit, and an auxiliary cooling heat exchanger having a smaller heat capacity than the main cooling heat exchanger,
An environmental test apparatus, wherein the auxiliary cooling heat exchanger comprises an electronic cooler. In claim 1,
The auxiliary cooling heat exchanger includes a first auxiliary cooling heat exchanger and a second auxiliary cooling heat exchanger,
One of the first auxiliary cooling heat exchanger and the second auxiliary cooling exchanger is configured to be an air cooler alternately. In claim 2,
In the operation condition in which the auxiliary cooling heat exchanger is frosted, when one of the first auxiliary cooling heat exchanger and the second auxiliary cooling heat exchanger becomes an air cooler, the operation mode in which defrosting is performed on the other is An environmental test apparatus characterized by being configured. In claim 1, 2 or 3,
An environmental test apparatus characterized in that the electronic cooler is composed of a Peltier effect element, the first heating surface of the Peltier effect element faces the inside of the machine, and the second heating surface faces the outside of the machine. .

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