JP4783048B2 - Constant temperature and humidity device - Google Patents

Description

  The present invention relates to a constant temperature and humidity device that can be adjusted to a target temperature and humidity in a predetermined cabinet or room, and is desirably used as an environmental test device.

  Environmental testing is known as a measure for testing the durability of equipment and components. The environmental test is performed using a device called a constant temperature and humidity device or an environmental test device. Here, the constant temperature and humidity device includes a heater, a cooling device, and a humidifying device as in Patent Document 1, and creates a desired environment in the cabinet. For example, an environment of temperature and humidity such as a temperature of 60 ° C. (degrees Celsius) and a humidity of 80% (percent) is artificially created.

  The cooling device employed in the conventional constant temperature and humidity device executes a refrigeration cycle that compresses and condenses the phase-changing refrigerant, evaporates and cools it, and stores the evaporator (heat exchanger). It is installed in the internal or external air conditioner to cool the air in the cabinet.

JP 2000-11127 A

  Although the temperature and humidity device of the prior art is satisfactory in terms of performance, there is a market demand for reducing power consumption. That is, more energy-saving constant temperature and humidity devices are required in the market. In particular, the constant temperature and humidity device is often used for environmental tests and is often operated continuously for a long period of time. Therefore, more energy-saving devices are expected in the market.

  Therefore, the present inventor examined energy loss in the conventional constant temperature and humidity device. As a result, in the constant temperature and humidity device of the prior art, it has been found that the energy of the cooling device is consumed not only for lowering the internal temperature but also for condensing the water vapor in the internal space. In other words, it has been found that the conventional constant temperature and humidity device not only lowers the sensible heat in the cabinet but also consumes energy to reduce the latent heat, resulting in wasted energy.

That is, the cooling device employed in the constant temperature and humidity device of the prior art executes a refrigeration cycle that compresses and condenses the phase change refrigerant and evaporates and cools it as described above. The exchanger is installed in the cabinet or in the air conditioner section to cool the air in the cabinet.
Therefore, the temperature of the part (evaporator) that exchanges heat with the air in the warehouse becomes considerably low, and water vapor contained in the air in the warehouse is condensed. As a result, not only the temperature in the cabinet but also the humidity is lowered. Therefore, in the constant temperature and humidity device of the prior art, it was necessary to supply water vapor into the cabinet by the humidifier in order to maintain the humidity.

Hereinafter, description will be made with reference to the saturated water vapor curve shown in FIG.
FIG. 1 is a graph showing a saturated water vapor curve and changes in the internal temperature and the internal humidity. In the graph, point A is the current environment, and shows the current internal temperature and the amount of water vapor contained. Point A is an environment having a temperature of 80 ° C. (degrees Celsius) and a relative humidity of 90% (percent).
B is a target environment (hereinafter sometimes referred to as a set environment), and shows the internal temperature and the amount of water vapor contained in the set environment. Point B is an environment with a temperature of 75 ° C. and a relative humidity of 90%. That is, the setting environment has the same relative humidity as the current environment and only the temperature is low.
Since the saturated water vapor curve is a graph showing the relationship between temperature and absolute humidity, that is, the temperature and the mass of water vapor that can be contained in a certain volume at the air temperature, generally speaking, the humidity (relative humidity) is on the graph at the temperature. It is the ratio of the Y-axis value to the Y-axis value at the point.

According to the constant temperature and humidity device of the prior art, the environment in the cabinet reaches the target point B environment through the process shown by the broken line. That is, when the cooling device is operated to lower the internal temperature, the surface temperature of the heat exchanger is low, so that water vapor condenses on the surface of the heat exchanger, and the humidity decreases with temperature. Specifically, the environment in the warehouse once reaches point C. That is, the point C is an environment where the internal temperature is the target temperature and the humidity is lower than the target value.
In the conventional constant temperature and humidity device, the humidifier is operated to supply water vapor into the cabinet, and the humidity is increased to create a setting environment.

For this reason, it has been found that in the constant temperature and humidity device of the prior art, the energy of the cooling device is consumed not only for lowering the internal temperature but also for condensing the water vapor in the internal space, which is wasteful.
Therefore, the present invention has an object to develop a constant temperature and humidity apparatus that is less wasteful and saves energy in order to meet the above-described demands of the prior art.

The invention according to claim 1, which can meet the above-described demand, includes a temperature detection means, a humidity detection means, and a cooling means, and air in the predetermined space circulates, and the environment in the predetermined space is a target. A constant temperature and humidity control device that can be adjusted to achieve a temperature (To) and a target humidity. The device is equipped with a dry dehumidifier, the humidity in the predetermined space is monitored by the humidity detection means, and the humidity detection means targets the absolute humidity. When it is detected that the air is higher, the dry dehumidifier is activated, the air in the predetermined space passes through the dry dehumidifier and is returned to the predetermined space, and the cooling means performs heat exchange with the air in the space. Having a exchanger, the temperature of the heat exchanger of the cooling means when lowering the temperature in the predetermined space is less than the target temperature (To), the target temperature (To) and Of the target humidity It is a constant temperature and humidity device and controlling than the dew point Dp in the boundary.

In the constant temperature and humidity device of the present invention, only the sensible heat is lowered by the cooling device, and the humidity adjustment is intended to be performed by the dry dehumidifying device.
The relationship between point A and point B shown in FIG. 1 described above is that the relative humidity is the same and only the temperature is low, but there are many cases in actual environmental tests. As in this example, in order to maintain the humidity and reduce only the temperature, not only the temperature but also water vapor in the air must be removed. In the constant temperature and humidity device of the prior art, as described above, the water vapor in the air is removed by dew condensation on the surface of the heat exchanger, whereas in the present invention, the water vapor in the air is removed by a dedicated dry dehumidifier. Remove.
That is, in the constant temperature and humidity device of the present invention, when the temperature of the room or the like is lowered, the temperature of the heat exchanger is controlled to be equal to or higher than the dew point Dp in the target environment and lower than the temperature in the target environment. Therefore, the condensation of water vapor on the surface of the heat exchanger becomes extremely small, and excessive water removal is not performed. Further, in the present invention, since the moisture is removed by the dry dehumidifier, the energy required to reach the desired environment is small.

The invention according to claim 2 for solving the same problem includes a temperature detecting means, a humidity detecting means, and a cooling means, and the environment in the predetermined space is set to a target temperature (To) and a target humidity. In the constant temperature and humidity device that can be adjusted as described above, the dry dehumidification device is provided, the humidity in the predetermined space is monitored by the humidity detection means, and when the humidity detection means detects that the humidity is higher than the target absolute humidity, the dry dehumidification device When the apparatus is activated, the air in the predetermined space passes through the dry dehumidifier and is returned to the predetermined space, and the cooling means has a heat exchanger for exchanging heat with the air in the space. When the temperature is lowered, the temperature and humidity control apparatus is controlled such that the temperature Ts of the heat exchanger of the cooling means becomes a target value satisfying the following formula.

The constant temperature and humidity device of the present invention is also designed to reduce only the sensible heat by the cooling device and to adjust the humidity by the dry dehumidifying device.
That is, in the constant temperature and humidity device of the present invention, the temperature of the heat exchanger is controlled to be close to the dew point Dp in the target environment when the temperature of the room or the like is lowered.
Therefore, the condensation of water vapor on the surface of the heat exchanger becomes extremely small, and excessive water removal is not performed. Further, in the present invention, since the moisture is removed by the dry dehumidifier, the energy required to reach the desired environment is small.

  The invention according to claim 3 is characterized in that when the temperature in the predetermined space is lowered, the dry dehumidifier removes a necessary amount of water vapor in the predetermined space. It is a constant temperature and humidity device.

  According to the constant temperature and humidity device of the present invention, energy for reducing latent heat is not loaded on the cooling means, and energy consumption is small.

  According to a fourth aspect of the present invention, the cooling means circulates the liquid refrigerant through the heat exchanger, and when the temperature in the predetermined space is lowered, the temperature of the liquid refrigerant becomes a predetermined temperature. The constant temperature and humidity device according to any one of claims 1 to 3, wherein the temperature of the heat exchanger is controlled by controlling the temperature.

The constant temperature and humidity device of the present invention circulates a liquid refrigerant in the heat exchanger to lower the temperature of the heat exchanger. When the temperature in the chamber or the room is lowered, the temperature of the refrigerant is a predetermined temperature. The temperature of the heat exchanger is controlled by controlling so that Therefore, the temperature of the heat exchanger is stabilized, and the condensation of water vapor is small.
Further, in the invention according to claim 5, the cooling means includes a secondary cooling circuit in which the liquid refrigerant flows in the heat exchanger, and a primary cooling circuit in which the phase-changing refrigerant flows to cool the liquid refrigerant, The secondary cooling circuit has a refrigerant tank and a three-way valve, and one opening of the three-way valve is connected to the air cooling heat exchanger, and the other opening is connected to the refrigerant tank. If the detected temperature is lower than the temperature of the set environment, the three-way valve is switched to the refrigerant tank side. If the temperature detected by the temperature detection means is higher than the set environment temperature, the three-way valve is used for air cooling. 5. The constant temperature and humidity device according to claim 1, wherein the liquid refrigerant flowing to the air cooling heat exchanger can be intermittently switched to the heat exchanger side.

  According to a sixth aspect of the present invention, the dry dehumidifier includes a rotating member that is filled with a solid desiccant and can be ventilated, a processing air conduction path, and a regeneration air conduction path, and the processing air conduction path and the regeneration air conduction path are In addition, a part of the rotating member is included in a part of the flow path, air in the predetermined space is introduced into the processing air conduction path, and high temperature air and / or low humidity air is introduced into the regeneration air conduction path. The constant temperature and humidity device according to any one of claims 1 to 5, wherein:

  In the constant temperature and humidity device of the present invention, air in the predetermined space is introduced into the processing air conduction path, moisture in the air is taken away by the solid desiccant, and the air in the predetermined space is dehumidified. The solid desiccant that has absorbed moisture reaches the portion of the regeneration air conduction path as the rotating member rotates. And since high temperature air etc. are introduce | transduced into the reproduction | regeneration air conduction path, the water | moisture content contained in a solid desiccant is removed.

  The constant temperature and humidity device of the present invention consumes less power and saves energy compared to the prior art.

Embodiments of the present invention will be further described below.
FIG. 2 (FIG. 7) is a conceptual diagram of the constant temperature and humidity device of the embodiment of the present invention. FIG. 3 is a conceptual diagram of a dry drying apparatus.
A constant temperature and humidity device 1 shown in FIG. 2 (FIG. 7) includes a constant temperature and humidity chamber (predetermined space) 2 surrounded by a heat insulating material 15. A humidity control circuit 30 is attached to the constant temperature and humidity chamber (predetermined space) 2. The interior of the constant temperature and humidity chamber 2 is divided into a test piece arrangement chamber 3 and an air conditioning passage 5 as shown in the figure. The air conditioning passage 5 has an opening communicating with the test piece arrangement chamber 3 on the lower side and the upper side, and is located in the test piece arrangement chamber 3 and in the vicinity of the upper opening of the air conditioning passage 5 with the indoor temperature detection sensor 11 and the humidity. A detection sensor 12 is provided.
The indoor temperature detection sensor 11 is specifically a thermocouple.

In the air conditioning passage 5, an air cooling heat exchanger 6, a heater 7, and a fan 10 are arranged.
The air cooling heat exchanger 6 is a part of a cooling device 20 described later, and a liquid refrigerant (brine) circulates therein.
The heater 7 is a known electric heater. The fan 10 is a known one.

  In the constant temperature and humidity device 1 of the present embodiment, the air in the constant temperature and humidity chamber 2 is circulated by the fan 10 and passes through the air conditioning passage 5 to create a desired environment. That is, the air in the constant temperature and humidity chamber 2 is sucked from the lower side of the air conditioning passage 5 by the fan 10, passes through the air conditioning passage 5, and goes out to the opening on the upper side. At this time, the air passes through the air cooling heat exchanger 6 and further touches the heater 7.

In the constant temperature and humidity device 1, the temperature and humidity in the test piece arrangement chamber 3 are monitored by the indoor temperature detection sensor 11 and the humidity detection sensor 12. When the temperature inside the test piece arrangement chamber 3 is lower than the temperature of the set environment, the heater 7 is energized to raise the temperature. When the temperature inside the test piece arrangement chamber 3 is higher than the temperature of the set environment, A liquid refrigerant (brine) is allowed to flow through the air cooling heat exchanger 6 to lower the temperature of the air cooling heat exchanger 6, and heat is taken away from the circulating air.
Further, when the humidity in the test piece arrangement chamber 3 is lower than the humidity of the set environment, steam is injected from the humidifier 8 described later and mixed into the passing air.

Next, the cooling device 20 employed in the present embodiment will be described.
The cooling device 20 employed in the present embodiment cools the temperature and humidity chamber 2 by flowing a cooled liquid refrigerant (brine) through the air cooling heat exchanger 6 described above, and is divided into two systems. ing. That is, the cooling device 20 employed in the present embodiment includes a secondary cooling circuit 21 in which a liquid refrigerant (brine) flows, and a primary cooling circuit 22 in which a refrigerant that changes phase between gas and liquid flows.

As shown in FIG. 2 (FIG. 7), the secondary cooling circuit 21 includes a refrigerant tank 23, a pump 25, a three-way valve 26, and the air cooling heat exchanger 6 described above.
The refrigerant tank 23 is connected to the suction side of the pump 25, and the discharge side of the pump 25 is connected to one opening (first opening) of the three-way valve 26. The remaining two openings of the three-way valve 26 are connected to the air cooling heat exchanger 6 and the refrigerant tank 23, respectively. That is, the second opening of the three-way valve 26 is connected to the entrance opening of the air cooling heat exchanger 6, and the third opening is connected to the refrigerant tank 23.
The outlet opening of the air cooling heat exchanger 6 is connected to the refrigerant tank 23.

  The primary cooling circuit 22 executes a refrigeration cycle that compresses and condenses the phase-change refrigerant, evaporates and cools it, and is a refrigerator that includes a compressor, a condenser, and an expansion valve (not shown). . The evaporator 27 of the primary cooling device 22 is built in the refrigerant tank 23.

Therefore, when a compressor (not shown) of the primary cooling device 22 is started, the refrigerant gas is compressed and liquefied by a condenser (not shown). Then, it enters the evaporator 27 through an expansion valve and creates a low temperature.
In the constant temperature and humidity device 1 of the present embodiment, a liquid refrigerant temperature detection sensor 28 is provided in the refrigerant tank 23, and a compressor (not shown) is turned on / off so that the temperature detected by the liquid refrigerant temperature detection sensor 28 becomes a predetermined temperature. Be controlled.

As for the secondary cooling circuit 21, the pump 25 is always operated, and the liquid refrigerant flowing to the air cooling heat exchanger 6 is intermittently switched by switching the three-way valve 26.
That is, in the constant temperature and humidity apparatus 1, the temperature in the test piece arrangement chamber 3 is monitored by the indoor temperature detection sensor 11, and the target temperature in the test piece arrangement chamber 3 is set as the target temperature in the test piece arrangement chamber 3. When the temperature is lower than the environmental temperature, the three-way valve 26 is switched to the refrigerant tank 23 side. As a result, the liquid refrigerant circulates via the external pipe, and the refrigerant in the refrigerant tank 23 is agitated.
On the other hand, when the temperature in the test piece arrangement chamber 3 is higher than the temperature of the set environment, the three-way valve 26 is switched to the air cooling heat exchanger 6 side. As a result, the liquid refrigerant (brine) flows into the air cooling heat exchanger 6, the temperature of the air cooling heat exchanger 6 is lowered, and the temperature in the test piece arrangement chamber 3 is lowered.

  Moreover, in the constant temperature and humidity apparatus 1 of this embodiment, the humidity control circuit 30 is provided as a specific structure. The humidity control circuit 30 is an air flow path that is externally attached to the constant temperature and humidity chamber 2 and connects the test piece arrangement chamber 3 and the air conditioning passage 5. A dry dehumidifier 31 and a humidifier 8 are disposed in the middle of the humidity control circuit 30.

Here, as shown in FIG. 3, the dry dehumidifier 31 includes a rotating member 35, a processing air conduction path 36, and a regeneration air conduction path 37.
The rotating member 35 has a cylindrical shape and is filled with a solid desiccant. A solid desiccant that can be regenerated by heating is selected. A solid desiccant that is dehumidified by surface adsorption is recommended. For example, silica gel, silica alumina gel, lithium chloride, or the like can be used.

The rotating member 35 has air permeability in the axial direction. The rotating member 35 is slowly rotated by a motor (not shown).
The rotating member 35 includes the processing air conduction path 36 and the regeneration air conduction path 37 as described above. Each of the processing air conduction path 36 and the regeneration air conduction path 37 includes forward passages 36 a and 37 a and discharge passages 36 b and 37 b, both of which open to face the rotating member 35.

  That is, there are a forward processing air passage 36a and a discharge processing air passage 36b before and after a certain region of the rotating member 35. The end of the forward processing air passage 36 a is open facing one side surface of the rotating member 35. The opening of the discharge side processing air passage 36b is on the other surface of the rotating member 35 and is located at a position facing the forward side processing air passage 36a. As described above, since the rotation member 35 has air permeability in the axial direction, the forward processing air passage 36 a and the discharge processing air passage 36 b communicate with each other through a region of the rotation member 35. In other words, the processing air conduction path 36 includes a part of the rotating member 35 in a part of the flow path. A fan 40 is provided in the discharge-side processing air passage 36b, and the discharge-side processing air passage 36b side is set to a negative pressure so that air in the forward-side processing air passage 36a is sucked and discharged through one area of the rotating member 35. Air is discharged to the side processing air passage 36b side. Note that the images of the fans 40 and 41 in FIG. 3 are displayed in a model manner, and the mounting direction and the like are not limited to the drawings.

  Further, there are a forward regeneration air passage 37a and a discharge regeneration air passage 37b before and after the other region of the rotating member 35. The end of the forward regeneration air passage 37 a is open to face one side surface of the rotating member 35. Further, the opening of the discharge side regeneration air passage 37b is the other surface of the rotating member 35 and is located at a position facing the forward side regeneration air passage 37a. As described above, since the rotation member 35 has air permeability in the axial direction, the forward regeneration air passage 37 a and the discharge regeneration air passage 37 b communicate with each other through a region of the rotation member 35. Accordingly, the regeneration air conducting path 37 also includes a part of the rotating member 35 in a part of the flow path. A fan 41 is provided in the discharge side regeneration air passage 37b, and the discharge side regeneration air passage 37b side is set to a negative pressure so that the air in the forward regeneration air passage 37a is sucked and passed through a region of the rotary member 35 and discharged. Air is discharged to the side regeneration air passage 36b side. In addition, a heater 45 is inserted into the forward regeneration air passage 37 a, and air that has been heated and whose relative humidity has decreased is supplied to the rotating member 35. Note that the amount of dehumidification of the rotating member 35 can be changed by changing the temperature of the air heated by the heater 45. As a result, by changing the temperature of the air heated by the heater 45, the amount of water removed from the constant temperature and humidity chamber 2 can be changed.

  Note that the air flow direction in the rotating member 35 is different between the processing air conduction path 36 and the regeneration air conduction path 37. That is, as shown in FIG. 3, air flows from the front side of the drawing to the back side of the processing air conduction path 36, and air flows from the back side of the drawing to the front side of the regeneration air conduction path 37.

  The humidifier 8 supplies steam.

  The processing air conduction path 36 is in the middle of the humidity control circuit 30 as described above, the forward processing air passage 36a is connected to the test piece arrangement chamber 3 side, and the discharge processing air passage 36b is connected to the air conditioning passage 5 side. It is connected. Further, the humidifier 8 described above is interposed between the discharge side processing air passage 36 b and the air conditioning passage 5.

  Therefore, when the fan 40 provided in the discharge-side processing air passage 36b is started, the air in the test piece arrangement chamber 3 is sucked into the forward-side processing air passage 36a and passes through the rotating member 35, and the humidifier 8 Enter the air conditioning passage 5 through the part. That is, when the fan 40 provided in the processing air conduction path 36 is started, the air in the constant temperature and humidity chamber (predetermined space) 2 enters the humidity control circuit 30, and the air rotates in the dry dehumidifier 31 provided in the middle. It passes through the member 35 and returns to the constant temperature and humidity chamber (predetermined space) 2. Since the rotary member 35 is filled with the solid desiccant, the air returned to the constant temperature and humidity chamber (predetermined space) 2 is dehumidified.

Both ends of the regenerative air conduction path 37 are open to the atmosphere. In other words, the end of the forward regeneration air passage 37a is open to the atmosphere. The end of the discharge side regeneration air passage 37b is also open to the atmosphere. Accordingly, when the fan 41 provided in the discharge side regeneration air passage 37b is started and the heater 45 provided in the outward regeneration air passage 37a is energized, external air is taken into the outward regeneration air passage 37a and is heated by the heater 45. The temperature is raised by heating (relative humidity reduction) and passes through the rotating member 35. At this time, the passing air takes away moisture contained in the solid desiccant. For this reason, even if the solid desiccant is wet, it is regenerated by heating and becomes capable of absorbing moisture again.
The air that has passed through the rotating member 35 is released into the atmosphere.

In this embodiment, as will be described later, when the humidity in the test piece arrangement chamber 3 is higher than the set environment, the fan 40 provided in the processing air conduction path 36 is activated, and the air in the constant temperature and humidity chamber 2 is It enters the humidity control circuit 30 and returns to the constant temperature and humidity chamber (predetermined space) 2 through the dry dehumidifier 31.
On the other hand, the fan 41 and the heater 45 provided in the regeneration air conduction path 37 are always activated, and the external air is heated by the heater 45 (heated by a relative humidity is reduced) and passes through the rotating member 35. The moisture contained in the solid desiccant is removed and the solid desiccant is regenerated. The rotating member 35 is always rotated by a motor (not shown). Accordingly, air that has been heated and heated (relative humidity reduction) is flowed sequentially over the entire area of the rotating member 35. In other words, the heated and heated air is supplied to the rotating member 35 from the end of the forward regeneration air passage 37 a, and the forward regeneration air passage 37 a is merely opened facing one area of the rotational member 35. However, since the rotating member 35 is always rotating, the heated and heated air sequentially passes through the entire area of the rotating member 35.

As mentioned above, although the structure of the constant temperature and humidity apparatus 1 was demonstrated, the constant temperature and humidity apparatus 1 of this embodiment employ | adopts the specific temperature control system and humidity control system.
FIG. 4 is a block diagram of the control device of the constant temperature and humidity device 1 of the present embodiment.
The temperature control device 50 employed in the present embodiment is configured by a microcomputer or the like, and receives a signal from the indoor temperature detection sensor 11, a signal from the humidity detection sensor 12, and a signal from the liquid refrigerant temperature detection sensor 28.
A setter 51 is connected to the temperature control device 50. The setting device 51 is a device that inputs the temperature and humidity of the setting environment.
On the other hand, a three-way valve drive circuit 32, a compressor drive circuit 33, a dehumidifier drive circuit 55, and a humidifier drive circuit 56 are connected to the output side of the temperature control device 50.

The temperature control device 50 stores a program for calculating a dew point as a configuration unique to the present embodiment. Specifically, the dew point in the setting environment set by the setting device 51 is calculated. For example, if the set environment is point B in FIG. 1, and the temperature is 75 ° C. and the humidity is 90%, the dew point Dp in this environment is calculated as 73.5 ° C.
Then, the signal of the liquid refrigerant temperature detection sensor 28 is monitored, and this temperature is controlled to be equal to or higher than the dew point Dp in the set environment and lower than the temperature To in the set environment.
In practice, even if the temperature is slightly lower than the dew point, there is little adverse effect. Further, it is desirable that the temperature of the liquid refrigerant is lower because the cooling rate of air becomes faster.
From these points, in this embodiment, the compressor is on / off controlled so that the liquid refrigerant temperature Tb detected by the liquid refrigerant temperature detection sensor 28 becomes a target value that satisfies the following equation.

  More preferably, the liquid refrigerant temperature Tb detected by the liquid refrigerant temperature detection sensor 28 is controlled to be equal to the dew point in the set environment.

  When the temperature in the test piece arrangement chamber 3 detected by the room temperature detection sensor 11 is higher than the target temperature, a predetermined control signal is transmitted from the temperature control device 50 to the three-way valve drive circuit 32. The three-way valve 26 is switched and the liquid refrigerant controlled to the target temperature described above is caused to flow to the air cooling heat exchanger 6. At the same time, the dry dehumidifier 31 of the humidity control circuit 30 is activated.

  As described above, when the temperature detected by the indoor temperature detection sensor 11 is higher than the target temperature, the liquid refrigerant is flowed to the air cooling heat exchanger 6. Since it is a dew point temperature, the surface temperature of the air-cooling heat exchanger 6 drops with a target of a slightly higher temperature than the dew point in the set environment. Since this temperature is lower than the current internal temperature and is further lower than the set temperature, the internal temperature decreases so as to become the set temperature. However, since the surface temperature of the air cooling heat exchanger 6 is in the vicinity of the dew point in the setting environment, the water vapor is not excessively condensed on the surface of the air cooling heat exchanger 6. That is, since the surface temperature of the air-cooling heat exchanger 6 is lower than the current dew point, there is a possibility that water vapor is condensed. However, since the surface temperature is in the vicinity of the dew point in the set environment, the amount of water vapor condensed is Very few.

In the present embodiment, the humidity in the test piece arrangement chamber 3 is adjusted by the humidity adjustment circuit 30.
That is, in the present embodiment, as described above, when the indoor temperature detection sensor 11 detects a temperature higher than the target temperature, the liquid refrigerant is supplied to the air cooling heat exchanger 6, and the inside of the test piece arrangement chamber 3. Reduce temperature. When the temperature in the test piece arrangement chamber 3 decreases due to the refrigerant supply to the air cooling heat exchanger 6, the amount of saturated water vapor decreases, so that the humidity increases relatively. When the humidity sensor 12 detects this increase in humidity, the dry dehumidifier 31 of the humidity adjustment circuit 30 is activated. As a result, the air in the constant temperature and humidity chamber 2 (test piece placement chamber 3) enters the humidity control circuit 30, passes through the rotating member 35 of the dry dehumidifier 31 and returns to the constant temperature and humidity chamber 2 (air conditioning passage 5). It is. Here, since the rotary member 35 is filled with the solid desiccant, the air returned to the constant temperature and humidity chamber (predetermined space) 2 is dehumidified. Therefore, excessive water vapor in the thermostatic chamber 2 is removed, and the humidity is lowered.

  The capacity of the solid desiccant in the rotating member 35 is reduced by containing moisture. However, in this embodiment, the rotating member 35 rotates, and new surfaces of the rotating member 35 appear one after another. Maintained. That is, the air in the constant temperature and humidity chamber 2 is supplied to the rotating member 35 from the end of the outward processing air passage 36 a, and the outward processing air passage 36 a is open to face a region of the rotating member 35. However, since the rotating member 35 is constantly rotating, new surfaces of the rotating member 35 appear one after another at positions facing the forward processing air passage 36a, and the dehumidifying ability is maintained. Further, as described above, since the fan 41 and the heater 45 provided in the regeneration air conduction path 37 are always activated, when the moisture-containing part reaches the part of the regeneration air conduction path 37 by rotation, The generated air is ventilated to regenerate the solid desiccant.

  Compared with the case of the prior art with reference to FIG. 1 described above, in the constant temperature and humidity device of the prior art, the environment of the point C is once changed as indicated by the broken line, and the humidity is greatly reduced. In the humidity control apparatus 1, the point A moves from the point A to the point B linearly as indicated by a solid line. For this reason, the condensation of water vapor is very small, and there is little wasted energy required to reduce the latent heat.

In the embodiment described above, the liquid refrigerant temperature detection sensor 28 is provided in the refrigerant tank 23 and controlled so that the temperature of the refrigerant in the refrigerant tank 23 is close to the dew point of the set environment. However, the surface temperature of the air-cooling heat exchanger 6 is controlled. And the temperature may be controlled to be in the vicinity of the dew point.
FIG. 5 is a conceptual diagram of the constant temperature and humidity device of the second embodiment of the present invention. FIG. 6 is a block diagram of the control device of the constant temperature and humidity device shown in FIG.
In the constant temperature and humidity device 60 shown in FIG. 5, a temperature sensor 61 is attached to the surface of the air cooling heat exchanger 6, and the surface temperature of the air cooling heat exchanger 6 is directly adjusted by the temperature sensor 61. Detected.
And the signal of the said surface temperature sensor 61 is input into the temperature control apparatus 70, as shown in FIG. In the present embodiment, the compressor of the primary cooler is on / off controlled so that the surface temperature Ts of the air cooling heat exchanger 6 is close to the dew point in the set environment.
That is, in this embodiment, the compressor is on / off controlled so that the surface temperature Ts of the air cooling heat exchanger 6 detected by the surface temperature sensor 61 becomes a target value that satisfies the following equation.

  Also according to this embodiment, the condensation of water vapor is extremely small, and there is little wasted energy required to reduce latent heat.

  In each embodiment described above, the heater 7 and the humidifier 8 are provided, but these are not essential and may be omitted.

It is a graph which shows the change of a saturated water vapor curve, and the internal temperature and internal humidity. It is a conceptual diagram of the constant temperature and humidity apparatus of embodiment of this invention. It is a conceptual diagram of a dry-type drying apparatus. It is a block diagram of the control apparatus of the constant temperature and humidity apparatus of this embodiment. It is a conceptual diagram of the constant temperature and humidity apparatus of 2nd embodiment of this invention. It is a block diagram of the control apparatus of the constant temperature and humidity apparatus shown in FIG. It is a reference conceptual diagram of the constant temperature and humidity apparatus of the embodiment of the present invention.

2 Constant Temperature and Humidity 3 Specimen Placement Room 5 Air Conditioning Passage 6 Air Cooling Heat Exchanger 7 Heater 8 Humidifier 11 Indoor Temperature Sensor 12 Humidity Sensor 20 Cooling Device 26 Three-way Valve 30 Humidity Control Circuit 31 Dry Dehumidifier 35 Rotating member 36 Process air conduction path 37 Regeneration air conduction path 40 Fan 41 Fan

Claims (6)

A temperature detecting means, a humidity detecting means, and a cooling means are provided, and the air in the predetermined space circulates, and the environment in the predetermined space can be adjusted so that the target temperature (To) and the target humidity become the target humidity. In the humidity device, a dry dehumidifier is provided, the humidity in the predetermined space is monitored by the humidity detection means, and when the humidity detection means detects that the humidity is higher than the target absolute humidity, the dry dehumidification device is activated and the predetermined space is detected. The inside air passes through the dry dehumidifier and is returned to the predetermined space, and the cooling means has a heat exchanger for exchanging heat with the air in the space, and is cooled when the temperature in the predetermined space is lowered. The temperature of the heat exchanger of the means is less than the target temperature (To), and is controlled to be equal to or higher than the dew point Dp in the environment of the target temperature (To) and the target humidity. Constant temperature and humidity device A constant temperature and humidity device that includes a temperature detection means, a humidity detection means, and a cooling means, and can be adjusted so that the environment in the predetermined space has a target temperature (To) and a target humidity, and includes a dry dehumidification device, When humidity in the predetermined space is monitored by the humidity detecting means and the humidity detecting means detects that the humidity is higher than the target absolute humidity, the dry dehumidifier is activated and the air in the predetermined space passes through the dry dehumidifier. The cooling means has a heat exchanger that exchanges heat with the air in the space, and when the temperature in the predetermined space is lowered, the temperature Ts of the heat exchanger of the cooling means Is controlled so as to be a target value satisfying the following formula.

  3. The constant temperature and humidity device according to claim 1, wherein when the temperature in the predetermined space is lowered, a necessary amount of water vapor in the predetermined space is removed by a dry dehumidifying device.   The cooling means circulates the liquid refrigerant in the heat exchanger, and when the temperature in the predetermined space is lowered, the temperature of the heat exchanger is controlled by controlling the temperature of the liquid refrigerant to be a predetermined temperature. The constant temperature and humidity device according to any one of claims 1 to 3, wherein the constant temperature and humidity device is controlled.   The cooling means includes a secondary cooling circuit through which liquid refrigerant flows in the heat exchanger, and a primary cooling circuit through which phase-changing refrigerant flows to cool the liquid refrigerant, and the secondary cooling circuit includes a refrigerant tank and a three-way valve. One opening of the three-way valve is connected to the air cooling heat exchanger, and the other opening is connected to the refrigerant tank, and the temperature detected by the temperature detecting means is higher than the temperature of the set environment. When the temperature is low, the three-way valve is switched to the refrigerant tank side, and when the temperature detected by the temperature detecting means is higher than the set environment temperature, the three-way valve is switched to the air cooling heat exchanger side to The constant temperature and humidity device according to any one of claims 1 to 4, wherein the liquid refrigerant flowing in the exchanger can be intermittently connected.   The dry-type dehumidifying device includes a rotating member that is filled with a solid desiccant and can be ventilated, a processing air conduction path, and a regeneration air conduction path. The processing air conduction path and the regeneration air conduction path flow through a part of the rotation member. The air in the predetermined space is introduced into the processing air conduction path, and high-temperature air or low-humidity air is introduced into the regeneration air conduction path, or high temperature and low. The constant temperature and humidity device according to any one of claims 1 to 5, wherein air of humidity is introduced.

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