Outside air treatment module, and heat exchange type ventilation device

Abstract

To provide an outside air treatment module capable of appropriately controlling latent heat treatment efficiency and sensible heat treatment efficiency according to an outside air state.SOLUTION: An outside air treatment module of the present invention is an outside air treatment module that adjusts a temperature of outside air flowing from the outside to the inside of a room, the outside air treatment module including: a heat absorber that cools outside air; an evaporator that is provided upstream of the heat absorber, and cools outside air before it is cooled by the heat absorber; a condenser that is provided downstream of the heat absorber, and heats outside air after it has been cooled by the heat absorber; and a refrigerant circuit that connects the evaporator and the condenser in an annular manner to circulate a refrigerant. The refrigerant circuit comprises a circuit opening / closing unit that opens and closes the refrigerant circuit to control whether the refrigerant is circulated.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an outdoor air treatment module and a heat exchange type ventilation device.

Background Art

[0002] For example, Patent Document 1 discloses a technique related to a latent heat treatment module mounted on an outdoor air treatment device that performs dehumidification. The conventional configuration will be described with reference to FIG. 7. As shown in FIG. 7, the latent heat treatment module 101 includes a sensible heat exchanger 104 in which an evaporator 102 that cools the processing air before dehumidification by sensible heat exchange and a condenser 103 that heats the processing air after dehumidification by sensible heat exchange are connected so that a refrigerant circulates between them, and an air heat exchanger 105 as a heat exchanger that performs latent heat treatment of the processing air cooled by the evaporator 102.

[0003] The processing air introduced into the latent heat treatment module 101 is cooled to 20° C. by sensible heat exchange in the evaporator 102. Next, the processing air is subjected to latent heat exchange by the air heat exchanger 105, cooled to 10° C., and simultaneously dehumidified. Subsequently, the cooled and dehumidified processing air is reheated to 18° C. by sensible heat exchange in the condenser 103, becomes a temperature close to the room temperature of the air-conditioning target space, and is discharged to the outside of the latent heat treatment module 101. By performing outdoor air treatment as described above, it is said that the dehumidification load can be reduced as compared with the case where cooling by the evaporator 102 of the sensible heat exchanger 104 is not performed (see Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Conventionally, the latent heat treatment efficiency in an air heat exchanger has been increased by pre-cooling the air before dehumidification. However, depending on the state of the outside air, it may be better to prioritize the sensible heat treatment efficiency, which involves heat exchange in terms of temperature, over the latent heat treatment efficiency, which involves moisture exchange. For example, when the temperature of the outside air is high and the humidity of the outside air is sufficiently low, there is no need for dehumidification. In such cases, it is energy-saving because the outside air is not heated or cooled more than necessary by reducing the latent heat treatment efficiency and increasing the sensible heat treatment efficiency.

[0006] Therefore, the present invention aims to solve the above problems and provides an outside air treatment module capable of appropriately controlling the latent heat treatment efficiency and the sensible heat treatment efficiency according to the state of the outside air.

Means for Solving the Problems

[0007] To achieve this object, the outside air treatment module of the present invention is an outside air treatment module that adjusts the temperature of the outside air flowing from the outside to the inside of the room, and includes an absorber that cools the outside air, an evaporator that cools the outside air before it is cooled by the absorber on the upstream side of the absorber, a condenser that heats the outside air after it is cooled by the absorber on the downstream side of the absorber, and a refrigerant circuit that annularly connects the evaporator and the condenser to circulate the refrigerant. The refrigerant circuit includes a circuit opening / closing unit that controls whether to open and close the refrigerant circuit to circulate the refrigerant.

Effects of the Invention

[0008] According to the present invention, it is possible to provide an outside air treatment module capable of appropriately controlling the latent heat treatment efficiency and the sensible heat treatment efficiency according to the state of the outside air.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings. Note that each of the embodiments described below shows a preferred specific example of the present invention. Therefore, numerical values, shapes, materials, components, arrangement positions of components, connection forms, etc. shown in the following embodiments are merely examples and are not intended to limit the present invention. Therefore, among the components in the following embodiments, components not described in the independent claims indicating the most general concept of the present invention are described as optional components. Also, in each figure, substantially the same configuration is denoted by the same reference numeral, and duplicate descriptions are omitted or simplified. (Embodiment) First, the configuration of an outdoor air treatment module according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic diagram of a heat exchange type ventilation device 1 equipped with an outdoor air treatment module 3 according to the present invention. FIG. 2 is a schematic diagram of the outdoor air treatment module 3 according to the present invention.

[0011] The heat exchange type ventilation device 1 is, for example, installed in a building and is a device that ventilates while performing heat exchange between outdoor air, which is outdoor air, and indoor air, which is indoor air. In other words, it ventilates while performing heat exchange between the supply air flow 19 sucked in from the outside and the exhaust air flow 20 sucked in from the inside. The heat exchange type ventilation device 1 includes an indoor air port 4, an outdoor air port 5, a supply air port 6, an exhaust air port 7, a supply air duct 8, an exhaust air duct 9, a total heat exchange element 2, an outdoor air treatment module 3, and a control unit 18.

[0012] The internal air inlet 4 is an opening provided in the housing of the heat exchange type ventilation device 1, and is a suction port that sucks indoor air into the heat exchange type ventilation device 1 as the exhaust air flow 20.

[0013] The outside air inlet 5 is an opening provided in the housing of the heat exchange type ventilation device 1, and is a suction port that sucks outdoor air into the heat exchange type ventilation device 1 as the supply air flow 19.

[0014] The supply air outlet 6 is an opening provided in the housing of the heat exchange type ventilation device 1, and is a blowout port that blows the supply air flow 19 from the heat exchange type ventilation device 1 into the room.

[0015] The exhaust air outlet 7 is an opening provided in the housing of the heat exchange type ventilation device 1, and is a blowout port that blows the exhaust air flow 20 from the heat exchange type ventilation device 1 to the outside.

[0016] The supply air duct 8 communicates the outside air inlet 5 and the supply air outlet 6, and is a duct through which the supply air flow 19 flows. The exhaust air duct 9 communicates the internal air inlet 4 and the exhaust air outlet 7, and is a duct through which the exhaust air flow 20 flows.

[0017] The total heat exchange element 2 is a member for heat exchange between the supply air flow 19 and the exhaust air flow 20. For example, in summer, heat exchange between the high-temperature supply air flow 19 and the low-temperature exhaust air flow 20 can suppress the temperature rise in the room. Also, in winter, heat exchange between the low-temperature supply air flow 19 and the high-temperature exhaust air flow 20 can suppress the temperature drop in the room.

[0018] The outside air treatment module 3 adjusts the temperature of the supply air flow 19 after heat exchange with the exhaust air flow 20 by the total heat exchange element 2. In other words, the outside air treatment module 3 adjusts the temperature of the outside air flowing from the outside to the inside. In this embodiment, the case of cooling and dehumidifying the supply air flow 19 will be described as an example.

[0019] Here, the outdoor air treatment module 3 is configured with a refrigeration cycle in which the refrigerant circulates in the order of the compressor 16, the radiator 15, the expander 17, and the absorber 14. Further, independently of the refrigeration cycle, a loop heat pipe in which the refrigerant circulates between the evaporator 10 and the condenser 11 is configured. In the refrigeration cycle, the compressor 16 serves as power to circulate the refrigerant, while in the loop heat pipe, the refrigerant circulates without power. In the refrigeration cycle and the loop heat pipe, for example, alternative refrigerants (such as HFC134a and R410A) are used as the refrigerant. Also, a four-way valve may be provided in the refrigeration cycle. By controlling the direction in which the refrigerant circulates with the four-way valve, the absorber 14 can be made to act as a radiator, or the radiator 15 can be made to act as an absorber. In other words, the outdoor air treatment module 3 can realize a plurality of operation modes such as cooling, heating, and dehumidification. The outdoor air treatment module 3 includes a compressor 16, a radiator 15, an expander 17, an absorber 14, an evaporator 10, a condenser 11, a refrigerant circuit 12, a circuit opening / closing unit 13, and a humidity sensor 21.

[0020] The compressor 16 is a device that compresses the low-temperature and low-pressure refrigerant in the refrigeration cycle, increases the pressure, and raises the temperature. By compressing the refrigerant with the compressor 16, the refrigerant circulates through the refrigeration cycle. In the present embodiment, the compressor 16 sets the temperature of the refrigerant to about 45°C.

[0021] The radiator 15 is a device that releases the heat of the refrigerant that has become high-temperature and high-pressure by the compressor 16 to the outside. The radiator 15 is disposed on the downstream side of the total heat exchange element 2 in the exhaust air duct 9 and heats the exhaust air flow 20 after heat exchange with the supply air flow 19. In other words, the radiator 15 exchanges heat with the indoor air flowing from the indoor to the outdoor. By exchanging heat between the radiator 15 and the exhaust air flow 20, the heat absorbed by the absorber 14 from the supply air flow 19 can be discharged from the exhaust port 7 together with the exhaust air flow 20. In the radiator 15, the temperature of the refrigerant is higher than the temperature of the exhaust air flow 20. Therefore, when heat exchange occurs between the exhaust air flow 20 and the radiator 15, the temperature of the exhaust air flow 20 rises and the temperature of the refrigerant drops.

[0022] The expander 17 is a device that reduces the pressure of the high-pressure refrigerant compressed by the compressor 16 to bring the refrigerant to a low-temperature and low-pressure state. Note that the expander 17 is also referred to as an expansion valve.

[0023] The heat absorber 14 cools the supply air flow 19 in the supply air duct 8 with the refrigerant that has become low-temperature and low-pressure by the expander 17. As a result, the temperature of the supply air flow 19 becomes below the dew point temperature, causing the supply air flow 19 to condense, and the moisture in the supply air flow 19 is removed. That is, when the supply air flow 19 is cooled by the heat absorber 14, dehumidification of the supply air flow 19 is performed. The heat absorber 14 is arranged on the downstream side of the total heat exchange element 2 in the supply air duct 8 and cools the supply air flow 19 after heat exchange with the exhaust air flow 20. In other words, the heat absorber 14 exchanges heat with the outside air flowing from the outside to the inside of the room. In the heat absorber 14, the temperature of the refrigerant is lower than the temperature of the supply air flow 19. Therefore, when heat exchange occurs between the supply air flow 19 and the heat absorber 14, the temperature of the supply air flow 19 decreases and the temperature of the refrigerant increases.

[0024] The evaporator 10 is provided between the total heat exchange element 2 and the heat absorber 14 and cools the supply air flow 19 before it is cooled by the heat absorber 14 on the upstream side of the heat absorber 14. In other words, the evaporator 10 exchanges heat with the outside air before it is cooled by the heat absorber 14 on the upstream side of the heat absorber 14. In the evaporator 10, the refrigerant absorbs heat from the supply air flow 19 and evaporates. By pre-cooling the supply air flow 19 with the evaporator 10 on the upstream side of the heat absorber 14, it becomes easier to reach below the dew point temperature when the supply air flow 19 is cooled by the heat absorber 14, and dehumidification can be performed efficiently. In other words, the latent heat treatment efficiency of the heat absorber 14 can be improved by the evaporator 10.

[0025] The condenser 11 is provided on the downstream side of the heat absorber 14 and heats the supply air flow 19 after it is cooled by the heat absorber 14 on the downstream side of the heat absorber 14. In other words, the condenser 11 exchanges heat with the outside air after it is cooled by the heat absorber 14 on the downstream side of the heat absorber 14. In the condenser 11, the refrigerant gives heat to the supply air flow 19 and condenses. Note that the heating in the condenser 11 is also referred to as reheat because it reheats what has been pre-cooled by the evaporator 10.

[0026] The refrigerant circuit 12 is the flow path of the refrigerant in the loop heat pipe, and annularly connects the evaporator 10 and the condenser 11. Here, the flow path through which the refrigerant evaporated in the evaporator 10 reaches the condenser 11 from the evaporator 10 is defined as the refrigerant circuit 12a, and the flow path through which the refrigerant condensed in the condenser 11 reaches the evaporator 10 from the condenser 11 is defined as the refrigerant circuit 12b. The refrigerant circuit 12a connects the upper part of the evaporator 10 and the upper part of the condenser 11. Also, the refrigerant circuit 12b connects the lower part of the evaporator 10 and the lower part of the condenser 11.

[0027] The circuit opening / closing part 13 is a member that controls whether to open and close the refrigerant circuit 12 to circulate the refrigerant in the loop heat pipe. The circuit opening / closing part 13 is, for example, a rotatable valve or damper. When in the open state, the refrigerant flows through and circulates in the refrigerant circuit 12, and when in the closed state, the circulation of the refrigerant stops. Different from the refrigeration cycle powered by the compressor 16, in the loop heat pipe, the refrigerant circulates without power, so the circulation of the refrigerant can be easily stopped by closing the refrigerant circuit 12. The circuit opening / closing part 13 is preferably provided in the refrigerant circuit 12a on the path of the refrigerant from the evaporator 10 to the condenser 11. In the refrigerant circuit 12a, since the refrigerant that has become a gas in the evaporator 10 flows, it can be opened and closed with less force compared to the refrigerant circuit 12b in which the liquid refrigerant flows.

[0028] The humidity sensor 21 is arranged between the total heat exchange element 2 and the evaporator 10, and detects the humidity of the supply air flow 19 before being cooled by the evaporator 10. Note that the humidity sensor 21 may be installed anywhere as long as it can detect the humidity of the supply air flow 19 before being cooled by the evaporator 10. For example, it may be installed outside the outside air port 5, or may be installed between the outside air port 5 and the total heat exchange element 2. The humidity sensor 21 is communicably connected to the control unit 18 and outputs the detected humidity of the supply air flow 19 to the control unit 18.

[0029] The control unit 18 is a controller that controls the entire heat exchange type ventilation device 1. The control unit 18 has a computer system having a processor and a memory. Then, by the processor executing the program stored in the memory, the computer system functions as the control unit. Note that the control unit 18 may be provided by being recorded on a non-volatile recording medium such as a memory card, or may be provided through an electric communication line such as the Internet. Details of the control unit 18 will be described later.

[0030] Next, with reference to FIG. 3, the circulation of the refrigerant in the loop heat pipe will be described. FIG. 3 is a diagram showing the state of the refrigerant circuit 12 of the outside air treatment module 3 according to the present invention. Here, FIG. 3(a) is a diagram showing the case where the refrigerant circuit 12 is in an open state, and FIG. 3(b) is a diagram showing the case where the refrigerant circuit 12 is in a closed state.

[0031] First, the case where the refrigerant circuit 12 is in an open state will be described with reference to FIG. 3(a). In this case, first, heat exchange is performed between the supply air flow 19 that has passed through the total heat exchange element 2 in the evaporator 10 and the refrigerant. At this time, in the evaporator 10, the refrigerant takes heat from the supply air flow 19 and evaporates. The evaporated refrigerant gas moves to the upper part of the evaporator 10 due to the density difference. Here, the upper part of the evaporator 10 and the upper part of the condenser 11 are connected by the refrigerant circuit 12a. Therefore, the refrigerant gas moves from the evaporator 10 to the condenser 11 through the refrigerant circuit 12a.

[0032] Next, in the heat absorber 14, the supply air flow 19 cooled in the evaporator 10 is further cooled. As a result, the temperature of the supply air flow 19 becomes equal to or lower than the dew point temperature, and the supply air flow 19 condenses and is dehumidified.

[0033] Next, in the condenser 11, heat exchange is performed between the intake air stream 19 cooled by the heat absorber 14 and the refrigerant. At this time, in the condenser 11, the refrigerant condenses into a liquid because it is cooled by the intake air stream 19. The refrigerant that has condensed into a liquid moves to the lower part of the condenser 11 due to the height difference, that is, gravity. Here, the lower part of the condenser 11 and the lower part of the evaporator 10 are connected by the refrigerant circuit 12b. Therefore, the refrigerant that has become a liquid moves from the condenser 11 to the evaporator 10 through the refrigerant circuit 12b. As shown in Fig. 4(a), the evaporator 10 and the condenser 11 may be arranged with a height difference such that the condenser 11 is at a higher position than the evaporator 10. With such an arrangement, the liquid level of the refrigerant on the condenser 11 side becomes physically higher than the liquid level on the evaporator 10 side, so the refrigerant flows more easily to the evaporator 10 side than when there is no height difference. Also, as shown in Fig. 4(b), the condenser 11 and the evaporator 10 may be communicated with each other with an inclination such that the end on the condenser 11 side in the refrigerant circuit 12b is higher than the end on the evaporator 10 side. With such a configuration, the refrigerant flows more easily to the evaporator 10 side along the inclination provided for the refrigerant circuit 12b.

[0034] Thus, if the refrigerant circuit 12 is in an open state, the refrigerant in the loop heat pipe can be naturally circulated without the need for external power. In particular, when the external air state is high temperature and high humidity, the latent heat treatment efficiency in the heat absorber 14 is improved by pre-cooling the intake air stream 19 in the evaporator 10 of the loop heat pipe. In other words, the intake air stream 19 can be efficiently dehumidified.

[0035] By the way, regarding the heat absorber 14, depending on the state of the external air, it may be better to prioritize the sensible heat treatment efficiency that exchanges heat in terms of temperature rather than the latent heat treatment efficiency that exchanges moisture. For example, consider the case where the external air temperature is high and the external air humidity is sufficiently low. In such a case, since there is no need for dehumidification, it is energy-saving because the external air is not heated or cooled more than necessary by reducing the latent heat treatment efficiency and increasing the sensible heat treatment efficiency.

[0036] Next, with reference to FIG. 3(b), the case where the refrigerant circuit 12 is in a closed state will be described. In this case, since the refrigerant circuit 12 is closed by the circuit opening / closing unit 13 disposed in the refrigerant circuit 12a, the refrigerant in the loop heat pipe does not circulate. In other words, the functions of the evaporator 10 and the condenser 11 of the loop heat pipe stop. Therefore, the supply air flow 19 is cooled by the heat absorber 14 without being precooled by the evaporator 10. Further, the supply air flow 19 is blown into the room from the air supply port 6 without being reheated by the condenser 11.

[0037] When the refrigerant circuit 12 is in the closed state in this way, since the supply air flow 19 is not precooled by the evaporator 10, it becomes difficult for the heat absorber 14 to reach a temperature below the dew point temperature, and only heat exchange in terms of temperature occurs between the supply air flow 19 and the refrigerant. In other words, the latent heat treatment efficiency of the heat absorber 14 decreases and the sensible heat treatment efficiency increases. Further, since the supply air flow 19 is not heated by the condenser 11, it is not necessary to cool the supply air flow 19 more than necessary by the heat absorber 14. In other words, since it is only necessary to cool the supply air flow 19 to the temperature desired to be supplied to the room by the heat absorber 14, the outside air can be processed in an energy-saving manner.

[0038] Next, with reference to FIG. 5, the control unit of the outside air treatment module 3 will be described. FIG. 5 is a functional block diagram showing the schematic configuration of the control unit 18 that controls the outside air treatment module 3.

[0039] The control unit 18 includes a refrigeration cycle control unit 24, a humidity acquisition unit 22, an operation mode acquisition unit 23, an opening / closing determination unit 25, and an opening / closing control unit 26.

[0040] The refrigeration cycle control unit 24 controls the compressor 16 and the expander 17 and adjusts the temperatures of the heat absorber 14 and the radiator 15. When a four-way valve is provided in the refrigeration cycle, the four-way valve may also be controlled. When the refrigerant is circulated in the order of the compressor 16, the radiator 15, the expander 17, and the heat absorber 14 by the four-way valve, the radiator 15 heats the exhaust air flow 20 as a radiator, and the heat absorber 14 cools the supply air flow 19 as a heat absorber. Further, when the refrigerant is circulated in the order of the compressor 16, the heat absorber 14, the expander 1 7. When the refrigerant is circulated in the order of the radiator 15, the radiator 15 cools the exhaust gas flow 20 as a heat absorber, and the heat absorber 14 heats the intake air flow 19 as a radiator.

[0041] The humidity acquisition unit 22 acquires the humidity of the intake air flow 19 before being cooled by the evaporator 10. The humidity acquisition unit 22 is communicably connected to, for example, the humidity sensor 21, and acquires the humidity of the intake air flow 19 detected by the humidity sensor 21. Note that the humidity to be acquired may be relative humidity or absolute humidity. When relative humidity is acquired, the temperature of the intake air flow 19 may also be additionally acquired in order to calculate the absolute humidity.

[0042] The operation mode acquisition unit 23 acquires the operation mode set in the outside air treatment module 3 among a plurality of operation modes such as cooling, heating, and dehumidification. The operation mode acquisition unit 23 acquires, for example, the setting input by the user to the outside air treatment module 3 using the remote control device.

[0043] The opening / closing determination unit 25 determines whether to open or close the refrigerant circuit 12 based on the humidity of the intake air flow 19 acquired by the humidity acquisition unit 22 and the operation mode of the outside air treatment module 3 acquired by the operation mode acquisition unit 23. Note that when a temperature sensor is installed to acquire the temperature of the intake air flow 19, it may be additionally determined whether to open or close the refrigerant circuit 12 based on the acquired temperature of the intake air flow 19.

[0044] The opening / closing control unit 26 controls the circuit opening / closing unit 13 based on the determination result in the opening / closing determination unit 25, and opens and closes the refrigerant circuit 12.

[0045] Next, with reference to FIG. 6, the flow of the process in which the control unit 18 controls the circuit opening / closing unit 13 will be described. FIG. 6(a) is a flowchart showing the flow of the process of the outside air treatment module 3 according to the present invention. FIG. 6(b) is a table associating the operation mode of the outside air treatment module 3 with the opening and closing of the refrigerant circuit 12. Here, each step in the flowchart is numbered with S as the first letter. For example, S001 etc. indicate processing steps. Note that the magnitude of the numerical values indicating the processing steps has no relation to the order of the processing.

[0046] The operation mode acquisition unit 23 acquires the operation mode set in the outside air treatment module 3 (S001).

[0047] The opening / closing determination unit 25 determines whether the operation mode set in the outside air treatment module 3 is the dehumidification mode (S002).

[0048] When the operation mode set in the outside air treatment module 3 is the dehumidification mode (S002: YES), the opening / closing control unit 26 opens the refrigerant circuit 12 regardless of the humidity of the outside air (S003).

[0049] When the operation mode set in the outside air treatment module 3 is other than the dehumidification mode (cooling mode or heating mode) (S002: NO), the humidity acquisition unit 22 acquires the humidity of the outside air detected by the humidity sensor 21 (S004).

[0050] The opening / closing determination unit 25 determines whether the humidity X of the outside air acquired by the humidity acquisition unit 22 is equal to or greater than a predetermined threshold value (S005).

[0051] When the humidity X of the outside air is equal to or greater than the predetermined threshold value (S005: YES), the refrigerant circuit 12 is opened (S003).

[0052] When the humidity X of the outside air is less than the predetermined threshold value (S005: NO), the refrigerant circuit 12 is closed (S006).

[0053] By such processing, it is possible to control the opening and closing of the refrigerant circuit 12 according to the state of the outside air and the operation mode of the outside air treatment module 3, and to control whether or not to circulate the refrigerant in the loop heat pipe. In other words, by controlling whether to operate or stop the functions of the evaporator 10 and the condenser 11 of the loop heat pipe, the latent heat treatment efficiency and the sensible heat treatment efficiency in the heat absorber 14 can be appropriately controlled. (Summary of the Invention) The outside air treatment module according to the present invention is an outside air treatment module that adjusts the temperature of outside air flowing from the outside to the inside of a room, and includes an endothermic device that cools the outside air, an evaporator that cools the outside air before it is cooled by the endothermic device on the upstream side of the endothermic device, a condenser that heats the outside air after it is cooled by the endothermic device on the downstream side of the endothermic device, and a refrigerant circuit that annularly connects the evaporator and the condenser to circulate a refrigerant. The refrigerant circuit includes a circuit opening / closing unit that controls whether to open and close the refrigerant circuit to circulate the refrigerant.

[0054] According to such a configuration, by opening and closing the refrigerant circuit, the latent heat treatment efficiency and the sensible heat treatment efficiency of the endothermic device can be appropriately controlled, and the outside air treatment module can be operated in an energy-saving manner.

[0055] Further, it includes a humidity sensor that detects the humidity of the outside air before it is cooled by the evaporator. When the humidity of the outside air detected by the humidity sensor is equal to or higher than a predetermined humidity threshold, the circuit opening / closing unit opens the refrigerant circuit. When the humidity of the outside air detected by the humidity sensor is less than the predetermined humidity threshold, the circuit opening / closing unit closes the refrigerant circuit. According to such a configuration, the latent heat treatment efficiency and the sensible heat treatment efficiency of the endothermic device can be accurately controlled according to the state of the outside air.

[0056] Further, it includes an operation mode acquisition unit that acquires the operation mode of the outside air treatment module. When the operation mode acquired by the operation mode acquisition unit is the dehumidification mode, the circuit opening / closing unit may be configured to open the refrigerant circuit. When the operation mode acquired by the operation mode acquisition unit is the cooling mode, the circuit opening / closing unit may be configured to close the refrigerant circuit.

[0057] According to such a configuration, even if the state of the outside air cannot be acquired from the humidity sensor, the latent heat treatment efficiency and the sensible heat treatment efficiency of the endothermic device can be accurately controlled according to the operation mode of the outside air treatment module.

[0058] Further, the circuit opening / closing unit may be configured to be located on the path of the refrigerant from the evaporator to the condenser.

[0059] According to such a configuration, since the refrigerant is in a gaseous state on the path from the evaporator to the condenser, it is easier to open and close the refrigerant circuit than in the case where a circuit opening / closing part is provided on the path from the condenser to the evaporator.

Industrial Applicability

[0060] The outside air treatment module according to the present disclosure is useful as a dehumidifiable heat exchange type ventilation device.

Explanation of Signs

[0061] 1 Heat exchange type ventilation device 2 Total heat exchange element 3 Outside air treatment module 4 Indoor air port 5 Outside air port 6 Supply air port 7 Exhaust port 8 Supply air duct 9 Exhaust duct 10 Evaporator 11 Condenser 12, 12a, 12b Refrigerant circuit 13 Circuit opening / closing part 14 Heat absorber 15 Heat radiator 16 Compressor 17 Expander 18 Control unit 19 Supply air flow 20 Exhaust air flow 21 Humidity sensor 22 Humidity acquisition unit 23 Operation mode acquisition unit 24 Refrigeration cycle control unit 25 Opening / closing determination unit 26 Opening / closing control unit 101 Latent heat treatment module 102 Evaporator 103 Condenser 104 Sensible heat exchanger 105 Air heat exchanger

Claims

1. An outside air treatment module for adjusting the temperature of outside air flowing from the outside to the inside, comprising: a heat absorber for cooling the outside air; an evaporator for cooling the outside air before being cooled by the heat absorber on the upstream side of the heat absorber; a condenser for heating the outside air after being cooled by the heat absorber on the downstream side of the heat absorber; a refrigerant circuit that annularly connects the evaporator and the condenser to circulate a refrigerant; and the refrigerant circuit is an outside air treatment module provided with a circuit opening / closing unit that controls whether to open and close the refrigerant circuit to circulate the refrigerant.

2. It is provided with a humidity sensor for detecting the humidity of the outside air before being cooled by the evaporator, and the circuit opening / closing unit sets the refrigerant circuit to an open state when the humidity of the outside air detected by the humidity sensor is equal to or higher than a predetermined humidity threshold, and sets the refrigerant circuit to a closed state when the humidity of the outside air detected by the humidity sensor is less than the predetermined humidity threshold. The outside air treatment module according to Claim 1.

3. It is provided with an operation mode acquisition unit for acquiring the operation mode of the outside air treatment module, and the circuit opening / closing unit sets the refrigerant circuit to an open state when the operation mode acquired by the operation mode acquisition unit is a dehumidification mode, and sets the refrigerant circuit to a closed state when the operation mode acquired by the operation mode acquisition unit is a cooling mode. The outside air treatment module according to Claim 1.

4. The circuit opening / closing unit is located on the path of the refrigerant from the evaporator to the condenser. The outside air treatment module according to Claim 1.

5. A heat exchange type ventilation device provided with the outside air treatment module according to any one of Claims 1 to 4.

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