JPH094879A - Method and apparatus for controlling temperature and humidity in constant temperature / humidity space - Google Patents

Abstract

(57) [Abstract] [Purpose] The evaporator of the temperature and humidity controller is a direct expansion type of refrigerant,
The preheater and reheater are of the electric heating type, and the reheater discharge air temperature is constant even if the outside air temperature changes. [Objective] Electrical energy is used as a heat source upstream and downstream of the air system in the evaporator of the refrigerant direct expansion type air cooling device which flows through the compressor 9, the condenser 10, the expansion valve 11, and the evaporator 2 in order and returns to the compressor again. The preheater 1 and the reheater 4 are arranged, and the humidifier 18 is installed downstream of the reheater to keep the temperature and humidity constant. A heat storage device 3 is provided between the heat storage device 38 and the heat storage device 38 so that the heat storage device 38 holds a heat capacity equal to or more than the amount of heat held in the heat generation part of the reheater.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses an electric heating type preheater and a reheater to heat air and a refrigerant direct expansion type cooling device to cool the air. Constant temperature to keep constant so that the temperature and humidity of the
The present invention relates to a temperature and humidity control method and apparatus for a constant humidity space.

[0002] More specifically, the temperature and humidity of a space (fairing) equipped with various control devices of a space rocket are controlled by a refrigerant direct expansion type air cooling device and a heat source of a preheater of electric energy,
The present invention relates to a temperature and humidity control method and device for a constant temperature / constant humidity space that is controlled using a reheater.

[0003]

2. Description of the Related Art Conventionally, a space (fairing) or the like equipped with various control devices for a space rocket has to be kept at a constant temperature and a constant humidity. And, the temperature of these constant temperature / constant humidity spaces is 20 ° C. ± 0.2 to 0.5 ° C., and the relative humidity is 30 to
It is required to keep constant in the range of 50% RH.

The constant temperature / humidity space for the space development rocket takes in 100% fresh outside air, and controls the temperature and humidity by a temperature / humidity control device in which a preheater, an evaporator, a reheater and a humidifier are arranged in this order from the upstream of the air system. The reheater discharged air is supplied to the fairing. Some of these evaporators use a direct expansion type using a refrigerant, and some use a heat exchanger using cold / hot water.The reheater uses an electric heater and a heat exchanger using hot water. Some have been adopted.

According to the method of controlling temperature and humidity by this temperature and humidity control device, when the outside air temperature is higher than the inside temperature of the fairing, the outside air is first cooled to a temperature lower than the target temperature, and then this temperature is reduced. Temperature and humidity are controlled by heating low-cooled air with a reheater. If the outside air temperature is lower than the fairing temperature, after heating with a preheater,
Furthermore, the temperature and humidity of the air discharged from the reheater are controlled by heating with a reheater and operating a steam or water spray type humidifier.

[0006]

In the air system of the conventional temperature / humidity control device, the preheater, the evaporator, the reheater, and the humidifier are arranged in this order from the outside air intake side while maintaining airtightness between them. To the outlet side, and the temperature and humidity of the discharged air are controlled to have a constant value.

Among these, in the one in which the evaporator is cold / hot water and the reheater is a hot water heat exchanger, a cold / hot water facility, a hot water producing device, etc. are required in addition to the constant temperature / humidity device, and the equipment space is large. However, there is a problem that it becomes expensive and is suitable only for a temperature / humidity control device having a large heat capacity.

Further, the evaporator is a direct expansion type using a refrigerant, and the reheater is an electric heater for cooling and heating air respectively, which is suitable for a relatively small capacity and requires a small equipment space. There is an advantage that it can be manufactured at low cost. However, since 100% of the outside air is taken in and the exhaled air from the outlet is maintained at a constant temperature and supplied to the target space, when the outside air temperature changes, the exhaled air temperature will be out of the control zone instantaneously or for a while. There was a problem.

That is, when the outside air temperature changes low, the operation of the evaporator is suddenly stopped and the preheater and the reheater are operated in order to heat the intake air in order to keep the discharge temperature of the reheater constant. Switch the temperature and humidity control device in the direction to At this time, even if the control of the reheater is performed by using a control device such as a semiconductor relay (SSR) having excellent control accuracy, the heat capacity of the reheater causes the reheater discharge air temperature to change. However, there is a problem in that the phenomenon of a rapid rise for a short time and a return to the control zone occurs again.

Further, when the outside air temperature changes highly,
In order to keep the reheater discharge temperature constant, the operation of the preheater is stopped and the evaporator and the reheater are operated to keep the reheater discharge temperature constant. However, on the contrary to the case where the outside air temperature changes low at the moment of switching between these operations, the phenomenon that the reheater discharge air temperature suddenly drops for a short time and returns to the control zone again occurs. There was a problem.

According to the present invention, the evaporator of the temperature / humidity control device is of the refrigerant direct expansion type, and the preheater and the reheater are of the electric heating type, and even if the outside air temperature changes, the reheater discharge air temperature is within the control zone. It is an object of the present invention to provide a temperature and humidity control method and device for a constant temperature and constant humidity space.

[0012]

In order to achieve the above-mentioned object, the method of controlling the temperature and humidity of the constant temperature / humidity space according to the present invention is to sequentially flow through a compressor, a condenser, an expansion valve and an evaporator, and then compress again. A preheater and a reheater using heat sources as electric energy are arranged upstream and downstream of the air system in the evaporator of the refrigerant direct expansion type air cooling device returning to the machine. Then, in a constant temperature / humidity space where a humidifier is installed downstream of the reheater to keep the temperature and humidity constant, excess and deficiency of the heat capacity of the reheater downstream of the air system of the evaporator is regenerated with the evaporator. It is designed to be supplemented by a heat storage device between the heat device and the heat storage device.

As the temperature / humidity control device for the constant temperature / constant humidity space of the present invention, the evaporation of the refrigerant direct expansion type air cooling device which flows through the compressor, the condenser, the expansion valve and the evaporator in this order and returns to the compressor again. A preheater and a reheater using heat sources as electric energy are arranged upstream and downstream of the air system. And, in a constant temperature / humidity space in which a humidifier is installed downstream of the reheater to keep the temperature and humidity constant, a heat storage device is provided between the evaporator and the reheater downstream of the air system of the evaporator. Set up.

A heat storage capacity of the regenerator is made to hold a heat capacity equal to or more than the amount of heat held in the heat generating section of the reheater.

Further, as the heat storage unit, a rectangular parallelepiped frame casing having tube plates having a plurality of tube holes fixed to opposite surfaces is provided, and a plurality of tubes having both ends opened through a plurality of fins are provided. It is interposed between the tube plates, and each tube end is projected from the tube hole of each tube plate to form a heat storage part.

Then, the tubes are emptied according to the amount of heat retained in the heat generating portion of the reheater, or liquid is injected into the tubes to close both ends of the tubes, and the air orthogonal to these tubes is removed. A flow path is formed, and a cover is provided on the air flow path and the frame casing other than the tube sheet.

[0017]

The temperature of the intake air passes through the blower 5 and rises by the amount of the blower shaft power energy. This blower 5 can be provided downstream of the air system such as the reheater 4, but the air that has passed through the blower 5 rises by the amount of shaft power energy, and because of the problem of controllability, a preheater that is easy to control is used. It is located upstream of the air system.

The space development rocket fairing 8
Since the flexible duct 7 is used to blow air, the motor power of the blower 5 is about twice as large as that without the flexible duct 7.

The preheater 1 is of an electric heating type, and the temperature controller 16 installed downstream of the preheater 1 adjusts the preheater outlet temperature to 1
Keep at 8 ° C. and lead to evaporator 2.

The evaporator 2 is a direct expansion type using a refrigerant, and the refrigerant is the evaporator 2, the reciprocating compressor 9, the condenser 10,
It has a refrigerant pipe 12 which circulates in sequence with the expansion valve 11 and returns to the evaporator 2 again. Then, the intake air temperature is continuously cooled within a certain range, and the air temperature is cooled to a predetermined temperature lower than 20 ° C.

When the intake air temperature falls within a certain range, the reciprocating compressor 9 gradually controls the capacity (decreases the number of operating cylinders) to plan the refrigerant evaporation temperature in the evaporator 2. Maintained at the specified temperature. Then, the evaporator outlet air temperature is always kept constant regardless of the temperature of the intake air 13.

The reheater 4 heats the temperature of the air cooled to a predetermined temperature lower than 20 ° C. in the evaporator 2 to 20 ° C., and sets the relative humidity to 30 to 50% RH.

As described above, the heating by the preheater 1, the cooling by the evaporator 2, and the heating by the reheater 4 again are performed by the reheater 4
Is a means for controlling the humidity at the time of exhalation of 30 to 50% RH.

The absolute humidity of air at 20 ° C. and 30 to 50% RH supplied to the fairing 8 of the target space development rocket is about 0.0046 to under atmospheric pressure (760 mmHg).
0.0077 kg / kg (DRY AIR), and the air discharged from the reheater 4 must have an absolute humidity within this range. That is, the outlet air of the evaporator 2 is 4 to 11 ° C.
It is necessary to control in the range of about 95% RH.

In this control, the preheater 1 preheats the preheater outlet air temperature, that is, the evaporator inlet air temperature to 18 ° C. by the temperature controller 16 installed downstream of the preheater 1. Further, the temperature switch 15 is provided near the suction port 51 of the blower 5, and when the air temperature of the intake air 13 becomes 9 ° C. or lower, the reciprocating compressor 9 is stopped and the cooling action of the evaporator 2 is stopped. Then, the reheater 4 and the humidifier 18 are operated to change the reheater discharge air temperature to 20 ° C.,
The humidity is set to 30 to 50% RH.

When the temperature of the intake air 13 becomes 11 ° C. or higher, the temperature switch 15 operates the reciprocating compressor 9. As a result, the evaporator 2 operates,
Due to the cooling action of the evaporator 2, the outlet air temperature of the evaporator 2 is controlled to be 9 ° C.

Therefore, in the evaporator 2, the temperature of the intake air 13 from the blower 5 is continuously cooled within a fixed range, and the air temperature is cooled to a predetermined temperature lower than 20 ° C.

When the temperature of the intake air 13 drops within a certain range, the suction pressure detector 19 provided on the suction side of the reciprocating compressor 9 reduces the number of operating cylinders of the reciprocating compressor 9. Perform capacity control. As a result, the evaporator 2
It is possible to maintain the refrigerant vaporization temperature in the inside at a planned temperature and always keep the evaporator outlet temperature constant regardless of the intake air temperature. This is a means for adjusting the relative humidity at the time of discharge in the reheater 4 to 30 to 50% RH.

The reciprocating compressor 9 is used while the intake air temperature decreases from a high temperature of 35 ° C. in summer to about 10 ° C.
The suction pressure detector 19 installed upstream of the compressor 9 keeps the refrigerant evaporation pressure at the planned value by the capacity control of the above. Then, the evaporator outlet air temperature is maintained at 9 ° C.

In addition, the temperature of the intake air is -1 ° C in winter and the like.
When the temperature is low, the evaporator 2 does not operate and the temperature controller 16
The preheater 1 is actuated by the above to heat by the heating action, and the air temperature thereof is preheated to 18 ° C. Then, the reheater 4 and the humidifier 18 are operated to discharge the air 1 discharged from the reheater 4.
The temperature of 4 is 20 ° C. and the humidity is 30 to 50% RH.

The reheater 4 is controlled by the temperature controller 17 so that the air temperature of 9 ° C. at the evaporator outlet becomes 20 ° C. at the outlet of the reheater 4.

In this way, the temperature control width is 20 ° C. ± 0.2 to
At 0.5 ° C., the preheater 1, the evaporator 2, the reheater 4 and the humidifier 18 are operated according to the intake air temperature, and the discharge air temperature of the reheater 4 is 20 ° C. and the humidity is 3 in any case.
0 to 50% RH is obtained.

However, when the intake air temperature falls below 9 ° C., the operation of the evaporator 2 is stopped and the cooling action is lost, so the discharge air temperature of the reheater 4 instantaneously rises rapidly. On the contrary, when the intake air temperature rises to 11 ° C. or higher, the evaporator 2 operates and the cooling action starts, so that the discharge air temperature of the reheater 4 suddenly drops suddenly.

Therefore, between the evaporator 2 and the reheater 4, the regenerator 3 having the regenerator 4 having the heat storage portion 38 having a heat capacity equal to or more than that of the heat generating portion of the electric heater of the reheater 4 can be retained. Set up. From this, the instantaneous increase in the discharge air temperature of the reheater 4 when the intake air temperature falls below 9 ° C and the discharge air temperature of the reheater 4 when the intake air temperature rises above 11 ° C A momentary drop can be suppressed to a minute by its heat absorption and heat dissipation.

Thus, no matter how the outside air temperature changes within the planned range of the outside air temperature, the regenerator 3 compensates for the excess or deficiency of the heat capacity of the reheater 4, so that the temperature of the air discharged from the reheater 4 is increased. It can be kept constant at 20 ° C. and relative humidity of 30 to 50% RH.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A temperature / humidity control method for a constant temperature / humidity space and an apparatus therefor according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows the temperature and humidity of a constant temperature / constant humidity space such as a fairing of a space rocket of the present invention, which uses a direct expansion type air cooling device using a refrigerant as an evaporator and an electric heater as a preheater and a reheater. It shows a control device. FIG. 2 shows the heat storage device of the present invention, and FIG. 3 shows that the fluctuation of the air temperature of the reheater discharge is improved, and the intake air temperature of the temperature and humidity control device of the present invention and the blower, the evaporator, and the reheater. It is a diagram at the time of cooling of the variation state of the outlet temperature with respect to time.

The temperature / humidity control device of the present invention comprises a preheater 1, an evaporator 2, a regenerator 3 and a reheater 4, which will be described later, which are airtightly connected to each other by a casing 6 from the upstream side of the air system. Each outer surface has a heat shield wall.

The preheater 1 is air-tightly connected to the discharge side of the blower 5 via the casing 6, and is of an electric heating type for controlling the preheater outlet air temperature, that is, the evaporator inlet air temperature to 18 ° C. . This is to control the heating amount at the outlet of the preheater 1 by a temperature controller 16 provided downstream of the preheater 1 to preheat the evaporator inlet air temperature to 18 ° C.

When the outside air temperature is higher than 18 ° C., the preheater 1 does not operate, and the air passing through the blower 5 passes through the preheater 1 and reaches the evaporator 2.

The evaporator 2 is air-tightly connected to the preheater 1 at the downstream side of the air system by a casing 6, and is of a direct expansion type using a refrigerant, and the evaporator 2, the reciprocating compressor 9, and the condenser 10 are used as the refrigerant system. The expansion valve 11 and the expansion valve 11 are sequentially connected by the refrigerant pipe 12. The temperature switch 15 is provided near the suction port 51 of the blower 5, and the temperature switch 15
And the reciprocating compressor 9 are connected to detect the temperature of the intake air 13, and the reciprocating compressor 9 is stopped or started depending on the temperature. That is, the reciprocating compressor 9 is stopped when the temperature decreases to the set temperature of 9 ° C. in the temperature switch 15, and the reciprocating compressor 9 is started when the temperature rises to the same set temperature of 11 ° C. It was done like this.

The heat accumulator 3 is airtightly connected to the casing 6 downstream of the evaporator 2 from the air system, and is also airtightly connected to the reheater 4 described later through the casing 6 so as to connect the reheater 4 with the reheater 4. It has a heat storage unit 38 that stores a heat capacity that is equal to or larger than the amount of heat that the electric heater of the heat generating unit can hold. The heat storage device 3 is configured by fixing a tube plate 32 having a plurality of tube holes to opposite surfaces of a rectangular parallelepiped frame casing 31 as shown in FIG. Then, a plurality of tubes 33 penetrating a large number of fins 34 and open at both ends are interposed between these tube plates 32, and tube ends 35 of these tubes 33 are provided.
Through the plurality of tube holes of the tube plate 32,
Both pipe ends of 3 are closed to form a heat storage unit 38.

The opposing surfaces of the rectangular parallelepiped frame casing 31 orthogonal to the plurality of tubes 33 are the air flow passage surfaces 37,
A cover 36 is provided on the surfaces of the rectangular parallelepiped frame casing 31 excluding the tube plate 32 and the air flow path surface 37 which face each other.

The heat accumulator 3 is provided with a large number of fins 34 on a plurality of tubes 33, and the product of the specific heat of each material and the weight of each material constituting the heat generating portion of the reheater 4 described later. It has a heat capacity equal to or greater than the heat holding amount shown by the sum of. Further, when the heat capacity of the reheater 4 described later is large, the pipe ends 35 of the plurality of pipes 33 whose both ends are closed are opened, and a liquid having a large specific gravity, such as saline, is injected into the inside from the pipe ends 35. , Its tube end 35 is closed. In this way, the heat capacity of the heat storage device 3 can be increased.

The reheater 4 is airtightly connected to the heat storage device 3 downstream of the air system via a casing 6. The heat generating portion of the reheater 4 is an electrothermal type in which an electric heater is provided inside the heat generating tube, and a nichrome wire is arranged inside the heat generating tube and its surface is covered with magnesium oxide (MgO). It is insulated. Then, the air cooled by the evaporator 2 is heated so that the temperature of the air discharged from the reheater 4 is 20 ° C. and the relative humidity is 30 to 50% HR.

The flexible duct 7 has a base end at the reheater 4
Is airtightly connected to the downstream of the air system of the spacecraft through a casing 6, and its tip is the fairing 8 of the space rocket.
It is connected airtightly. A temperature controller 17 equipped with a temperature sensor is provided in the flexible duct 7 and is connected to the electric heater of the heat generating portion of the reheater 4. Further, the humidity switch 20 is provided in the flexible duct 7 and the reheater 4
Solenoid valve of steam type or water spray type humidifier 18 and the like provided in the casing 6 between the outlet of the outlet and the flexible duct 18
Connect 1 and. The temperature inside the flexible duct 7 of the temperature controller 17 and the humidity switch 20 is 20 ° C. ±
Maintains 0.2-0.5 ° C, relative humidity 30-50% HR
Therefore, the reheater 4 and the humidifier 18 are controlled.

In using the device of the present invention, the temperature of the intake air (outside air) is detected by the temperature switch 15,
When this temperature is 11 to 35 ° C, the reciprocating compressor 9 is operated to cool the outlet air temperature of the evaporator 2 to 9 ° C. When the intake air temperature approaches 11 ° C, the suction pressure detector 1
The number of operating cylinders of the reciprocating compressor 9 is reduced by 9 to maintain the evaporation temperature at the planned temperature so that the outlet air temperature of the evaporator 2 becomes 9 ° C.

Further, since the preheater 1 is operated and the evaporator inlet air temperature is controlled to 18 ° C. regardless of the intake air (outside air), the preheater is also operated when the intake air temperature is −1 to 11 ° C. 1 is operating and the evaporator inlet air temperature is 1
The temperature is controlled at 8 ° C. At this time, since the evaporator 2 has stopped the cooling action, the air heated to 18 ° C. passes straight through the evaporator 2 and reaches the reheater. During this time, the reheater 4 is controlled by the temperature controller 17 so that the temperature of the discharge air 14 of the reheater 4 becomes 20 ° C.

The control by the temperature controller 17 is as follows.
In reality, since the flexible duct 7 has a heat loss, the temperature controller 17 is provided downstream of the flexible duct 7 to control the temperature of this portion.

Next, the manner in which the temperature fluctuation of the discharge air 14 in the reheater 4 is improved by using the present invention will be described in detail. Based on FIG. 3, which is a diagram in which the horizontal axis represents time and the vertical axis represents temperature, the fluctuations of the intake air temperature and the outlet temperature of the blower, the evaporator, and the reheater, which show how this fluctuation is improved, are shown. explain.

When the heat accumulator 3 of the present invention is not provided, as shown by the solid line in FIG. 3, the evaporator 2 is _cooled until the temperature T ₁ of the intake air 13 drops to a predetermined temperature T _1-1. Is activated and the outlet air temperature T ₄ of the reheater 4 is controlled to a constant value.

At time t ₁ , the intake air temperature T ₁ is T _1-1.
Then, the reciprocating compressor 9 is stopped and the cooling action of the evaporator 2 is stopped. Then, the outlet temperature T ₃ of the evaporator 2 rapidly rises and approaches the outlet temperature T ₂ of the blower 5, reaches the temperature T _{3-2 at} time t ₂ , and intersects with the outlet temperature T _2-2 of the blower 5.

[0053] Outlet air temperature T ₄ of reheater 4 reaches the _'temperature T _4-2 which is a peak in _the' time t ₂ before the time t _2. Eventually, reheater 4 is controlled, the outlet air temperature T _4-3 reheater 4 is equal to T ₄ at time t _3, the flow returns to a constant value T _4.

Here, when the heat storage device 3 of the present invention is equipped
Is the time t as indicated by the chain double-dashed line. ₁Start absorbing heat from
The outlet temperature T of the evaporator 2_ThreeRises slowly and at time t_Fourso
Blower 5 outlet temperature T_2-4Intersect with. In this evaporator 2
Outlet temperature T_ThreeDue to the gradual rise of
Outlet air temperature T_FourNo more soaring, exit of reheater 4
Air temperature T_FourTemperature rises at time t₂Time t in front_{2 "}To
This temperature T in_FourTemperature T slightly increased_{4-2 "}Only
Become.

The outlet temperature T ₄ of the reheater 4 at time t ₁ from T _4-1 to T _{4-2 '} , T _4-3 , T _{4-2 "} , T
_The area surrounded by _4-1 shows the control time delay of the reheater 4 and the heat capacity of the reheater 4.

Further, at the outlet temperature T ₃ of the evaporator 2,
The area surrounded by T _3-1 to T _3-2 , T _3-4 , and T _3-1 at time t ₁ indicates the heat capacity of the heat storage device 3.

As described above, when the regenerator 3 of the present invention is equipped, fluctuations in the outlet air temperature T ₄ of the reheater 4 corresponding to the heat capacity of the reheater 4 shown by the solid line in FIG. 3 can be eliminated. it can.

[0058]

According to the present invention, a refrigerant direct expansion type using a reciprocating compressor is used as an evaporator in a constant temperature / constant humidity space, and a preheater and a reheater are of an electric heating type. Since the heat accumulator is provided in, the disadvantages of the conventional refrigerant direct expansion type can be eliminated.

That is, when cooling the air having a low specific heat, which is the object to be cooled, when the evaporator is stopped, the cooling action is lost and the air temperature at the outlet of the evaporator immediately rises. Next, when heating by the reheater, the temperature of the air discharged from the reheater suddenly or temporarily increases even if a highly accurate temperature controller is used. Further, when the evaporator is started, the cooling action starts, and the temperature of the air passing through the evaporator immediately drops. Next, when heating with the reheater, even if the temperature controller with high accuracy is used, it is possible to eliminate the problem that the discharge air temperature of the reheater suddenly or temporarily drops.

That is, since the heat accumulator is provided between the evaporator and the reheater, even if the cooling function disappears when the evaporator is stopped,
An increase in the air temperature at the evaporator outlet can be prevented by the heat absorbing action of the heat storage device. Further, even if the evaporator is started to start the cooling action, the decrease in the air temperature at the outlet of the evaporator can be prevented by the heat generating action of the heat accumulator.

As a result, in the case of producing a thermostat / humidity device having a relatively small scale, large-scale auxiliary equipment such as cold / hot water equipment and hot water production equipment is not required, the equipment space is small, and the performance is low. It is possible to provide a high temperature and humidity controller.

[Brief description of drawings]

FIG. 1 shows a temperature / humidity control device for a constant temperature / constant humidity space such as a fairing of a space rocket according to the present invention, which uses a direct expansion type air cooling device using a refrigerant as an evaporator and a reheater, and an electric heater as a reheater. It is a system diagram.

FIG. 2 is a perspective view showing an example of a heat storage device used in the present invention.

[Fig. 3] Fig. 3 is a graph showing that the fluctuation of the air temperature discharged from the reheater is improved, and the fluctuation of the intake air temperature of the temperature / humidity control device of the present invention and the outlet temperatures of the blower, the evaporator, and the reheater with respect to time It is a diagram of time.

[Explanation of symbols]

 1 Preheater 2 Evaporator 3 Heat accumulator 31 Framework casing 32 Tube plate 33 Tube 34 Fin 35 Tube end 36 Cover 37 Flow path 38 Heat storage section 4 Reheater 5 Blower 51 Suction port 6 Casing 7 Flexible duct 8 Fairing 9 Compressor 10 Condenser 11 Expansion Valve 12 Refrigerant Pipe 13 Intake Air (Outside Air) 14 Reheater Exhaust Air 15 Temperature Switch 16, 17 Temperature Controller 18 Humidifier 181 Solenoid Valve 19 Intake Pressure Detector 20 Humidity Switch

Claims (3)

[Claims] 1. A preheater in which an electric energy is used as a heat source upstream and downstream of an air system in an evaporator of a refrigerant direct expansion air cooling device which flows through a compressor, a condenser, an expansion valve, and an evaporator in order, and then returns to the compressor. In a constant temperature / humidity space in which a reheater is installed and a humidifier is installed downstream of the reheater to keep the temperature and humidity constant, the heat capacity of the reheater over the air system downstream of the evaporator is exceeded. A constant temperature characterized in that the shortage was made up by a heat storage device between the evaporator and the reheater.
Temperature and humidity control method for constant humidity space. 2. A preheater in which an electric energy is used as a heat source upstream and downstream of the air system in the evaporator of the refrigerant direct expansion type air cooling device which flows through the compressor, the condenser, the expansion valve, and the evaporator in order, and then returns to the compressor. In a constant temperature / humidity space in which a reheater is arranged and a humidifier is installed downstream of the reheater to keep the temperature and humidity constant, an evaporator and a reheater downstream of the evaporator in the air system A temperature / humidity control device for a constant temperature / humidity space characterized in that a heat storage device is provided between the heat storage device and a heat storage unit of the reheater, which has a heat capacity equal to or more than the heat storage amount, is held in the heat storage unit of the heat storage device. 3. A rectangular parallelepiped frame casing in which tube plates having a plurality of tube holes are fixed to opposite surfaces, and a plurality of tubes having both ends opened through a plurality of fins are provided between the tube plates. By interposing them, each tube end is projected from the tube hole of each tube sheet to form a heat storage section, and these tubes are emptied or liquid is stored in these tubes depending on the amount of heat retained in the heat generation section of the reheater. By injecting and blocking both pipe ends respectively, an air flow passage orthogonal to these pipes was formed, and a cover was provided on the air flow passage and the frame casing other than the pipe sheet to form a heat storage device. The temperature / humidity control device for a constant temperature / constant humidity space according to claim 2.