Heat exchange type ventilation device

Abstract

A heat exchange type ventilation device (1) having a plurality of operation modes is provided with a first heat exchanger (12), an exhaust air passage (6), an air supply passage (7), a branch damper (40), a second heat exchanger (35), a first temperature adjustment unit (34), a second temperature adjustment unit (38), an outdoor unit (32), and a control device (20), and the control device (20) controls the first temperature adjustment unit (34), the second temperature adjustment unit (38), the outdoor unit (32), and the first temperature adjustment unit (34) and the second temperature adjustment unit (38). A branch damper (40), heating or cooling in a first temperature adjustment unit (34) belonging to a refrigeration cycle (30), and heating or cooling in a second temperature adjustment unit (38) are independently controlled, respectively.

Description

Technical Field

[0001] The present invention relates to a heat exchange type ventilation device. Background Art

[0002] Conventionally, a heat exchange type ventilation device that performs heat exchange between an air supply flow and an exhaust flow during ventilation has been known (for example, refer to Patent Document 1).

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2020-94771 Summary of the Invention

[0006] In addition, recently, an air conditioning system that air-conditions all rooms in a building, such as a central air conditioner, has attracted attention. In such an air conditioning system, the structure is generally such that air-conditioned air is supplied from an air conditioning room provided with an air conditioner to each room in the building via a duct.

[0007] The aforementioned heat exchange type ventilation device has a structure that is very similar to a central air conditioner in that it also supplies the dehumidified air supply flow to each room, but does not yet have the ability to cool and / or heat the entire building.

[0008] Therefore, the present invention solves the above-mentioned conventional problems, and an object thereof is to provide a heat exchange type ventilation device that can not only dehumidify but also cool and / or heat all rooms in a building, in other words, the entire building.

[0009] Moreover, in order to achieve this object, the heat exchange type ventilation device of the present invention has a plurality of operation modes. Among them, the heat exchange type ventilation device includes: a first heat exchanger that performs heat exchange between an exhaust flow and an air supply flow; an exhaust air duct that transports the exhaust flow; an air supply duct that transports the air supply flow and branches into a first flow path and a second flow path at a position downstream of the first heat exchanger; a branch air damper that adjusts the flow rate of the first flow path and the flow rate of the second flow path; a second heat exchanger that performs heat exchange between a first air supply flow and a second air supply flow, the first air supply flow flowing in the first flow path and the second air supply flow flowing in the second flow path; a first temperature adjustment unit that belongs to a refrigeration cycle and is provided between the first heat exchanger and the second heat exchanger in the air supply duct to cool or heat the first air supply flow; a second temperature adjustment unit that belongs to a refrigeration cycle and is provided at a position downstream of the second heat exchanger in the air supply duct to cool or heat the first air supply flow; an outdoor unit that belongs to a refrigeration cycle; and a control device that independently controls the branch air damper, heating or cooling in the first temperature adjustment unit belonging to the refrigeration cycle, and heating or cooling in the second temperature adjustment unit based on the set operation mode. Thus, the desired object is achieved.

[0010] According to the present invention, a heat exchange type ventilation device capable of dehumidifying, refrigerating and / or heating the entire building can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic diagram of the heat exchange type ventilation device of the present invention.

[0012] Figure 2 is a cross-sectional view of the indoor unit of the present invention.

[0013] Figure 3 is a schematic diagram showing the heat exchange type ventilation device in the refrigeration operation mode of the present invention.

[0014] Figure 4 is a schematic diagram showing the heat exchange type ventilation device in the heating operation mode of the present invention.

[0015] Figure 5 is a schematic diagram showing the heat exchange type ventilation device in the dehumidification operation mode of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0017] It should be noted that the following embodiments are examples of embodying the present invention and do not limit the technical scope of the present invention. In addition, in all the drawings, the same parts are denoted by the same reference numerals, and the description of the second and subsequent times is omitted or simplified. Moreover, in each drawing, the details of the parts not directly related to the present invention are omitted or simplified.

[0018] (Embodiment 1)

[0019] First, with reference to Figure 1 and Figure 2 the structure of the heat exchange type ventilation device 1 according to the embodiment of the present invention will be described. Figure 1 is a schematic diagram showing the structure of the heat exchange type ventilation device 1. Figure 2 is Figure 1 a sectional view taken along line A - A of the indoor unit 10 in . Here, the exhaust air flow 2 is the air discharged from the indoor to the outdoor, and the supply air flow 3 is the air taken in from the outdoor to the indoor.

[0020] The heat exchange type ventilation device 1 includes an outdoor unit 32 and an indoor unit 10.

[0021] The outdoor unit 32 is a device that compresses and expands the refrigerant. The outdoor unit 32 is installed outdoors. The outdoor unit 32 forms a refrigeration cycle 30 in which the refrigerant circulates between the indoor unit 10. Here, in the refrigeration cycle 30, a refrigerant substitute (HFC134a) is used as the refrigerant, for example. In addition, the connection of each machine constituting the refrigeration cycle 30 is, for example, to connect copper pipes by welding. The outdoor unit 32 includes a compressor 31, a first expander 33a, an outdoor unit temperature adjustment unit 39, and a four-way valve 41.

[0022] The compressor 31 belongs to the refrigeration cycle 30 and is a device that pressurizes the refrigerant to raise the temperature of the refrigerant. The compressor 31 circulates the refrigeration cycle 30, that is, the refrigerant, by pressurizing the refrigerant.

[0023] The first expander 33a belongs to the refrigeration cycle 30 and is a device that reduces the pressure of the refrigerant to lower the temperature of the refrigerant. The first expander 33a can switch between an expansion state in which the refrigerant is depressurized and expanded and an open state in which the refrigerant is not depressurized and allowed to pass through.

[0024] The outdoor unit temperature adjustment unit 39 cools or heats the refrigerant passing through it using external air. The outdoor unit temperature adjustment unit 39 is provided between the first expander 33a and the four-way valve 41 described later in the internal flow path of the outdoor unit 32 and in the refrigeration cycle. When the expanded refrigerant is introduced, the outdoor unit temperature adjustment unit 39 functions as an evaporator, and by releasing cold air to the outside (external air), the outdoor unit temperature adjustment unit 39 is heated. In addition, when the condensed refrigerant is introduced, the outdoor unit temperature adjustment unit 39 functions as a condenser, and by releasing heat to the outside, the outdoor unit temperature adjustment unit 39 is cooled.

[0025] The four-way valve 41 belongs to the refrigeration cycle 30 and is a component that switches the flow path of the refrigerant sent out from the compressor 31. The four-way valve 41 can switch the flow path that allows the compressed refrigerant to flow to the first temperature adjustment unit 34 described later and the flow path that allows the compressed refrigerant to flow to the outdoor unit temperature adjustment unit 39. When the compressed refrigerant flows to the first temperature adjustment unit 34, the four-way valve 41 guides the refrigerant flowing into the four-way valve 41 from the outdoor unit temperature adjustment unit 39 to the compressor 31, and guides the refrigerant flowing into the four-way valve 41 from the compressor 31 to the first temperature adjustment unit 34. In addition, when the compressed refrigerant flows to the outdoor unit temperature adjustment unit 39, the four-way valve 41 guides the refrigerant flowing into the four-way valve 41 from the first temperature adjustment unit 34 to the compressor 31, and guides the refrigerant flowing into the four-way valve 41 from the compressor 31 to the outdoor unit temperature adjustment unit 39.

[0026] The indoor unit 10 exhausts air to the outside of the house and supplies air to the inside of the house. The indoor unit 10 includes a main body housing 11, an internal gas port 14, an exhaust port 15, an exhaust air passage 6, an exhaust fan 13, an external gas port 17, a supply port 18, a supply air passage 7, a supply fan 16, a first heat exchanger 12, a second heat exchanger 35, a first temperature adjustment unit 34, and a second temperature adjustment unit 38.

[0027] The main body housing 11 is the outer frame of the indoor unit 10. The main body housing 11 is formed, for example, in a hollow box shape. The main body housing 11 includes an inclined bottom surface 9 and a water receiving portion 19.

[0028] The inclined bottom surface 9 is a part of the bottom surface in the main body housing 11 and is inclined so that the moisture generated inside the indoor unit 10 flows toward the side surface 8 in the main body housing 11. The inclined bottom surface 9 is provided vertically below the second heat exchanger 35, the first temperature adjustment unit 34, and the second temperature adjustment unit 38 described later.

[0029] The water receiving portion 19 is a member that collects the moisture guided to the side surface 8 side by the inclined bottom surface 9. The water receiving portion 19 is provided on the side surface 8 side in the main body housing 11. The water receiving portion 19 is connected to a discharge hose, for example, so that the collected moisture can be discharged to the outside of the house.

[0030] The internal gas port 14 is an intake port that sucks the exhaust air flow 2 from the inside of the house into the indoor unit 10. The internal gas port 14 is provided, for example, in a circular shape and is connected to a pipe.

[0031] The exhaust port 15 is an outlet port that blows the exhaust air flow 2 from the indoor unit 10 to the outside of the house. The exhaust port 15 is provided, for example, in a circular shape and is connected to a pipe.

[0032] The exhaust air passage 6 is an air supply passage that connects the internal gas port 14 and the exhaust port 15.

[0033] The exhaust fan 13 is a blower that guides the exhaust air flow 2 sucked from the internal gas port 14 to the exhaust port 15. The exhaust fan 13 is constituted by, for example, a sirocco fan.

[0034] The external gas port 17 is an intake port that sucks the supply air flow 3 from the outside of the house into the indoor unit 10. The external gas port 17 is provided, for example, in a circular shape and is connected to a pipe.

[0035] The supply port 18 is an outlet port that blows the supply air flow 3 from the indoor unit 10 to each room inside the house. The supply port 18 is provided, for example, in a circular shape and is connected to a pipe.

[0036] The supply air passage 7 is an air supply passage that connects the external gas port 17 and the supply port 18. The supply air passage 7 includes a branch air damper 40, a first flow path 36, and a second flow path 37.

[0037] The branch windshield 40 divides the supply air flow 3 into an air flow flowing into the first flow path 36 and an air flow flowing into the second flow path 37. In other words, the branch windshield 40 adjusts the flow rate of the first flow path 36 and the flow rate of the second flow path 37. The branch windshield 40 is provided on the downstream side of the first heat exchanger 12 in the supply air duct 7. It should be noted that when the branch windshield 40 is in a fully closed state, only the supply air flow 3 can be transported to the first flow path 36.

[0038] The first flow path 36 is a ventilation path that guides the supply air flow 3 in the order of the external gas port 17, the branch windshield 40, the first temperature adjustment unit 34, the second heat exchanger 35, the second temperature adjustment unit 38, and the supply port 18. In the following description, the supply air flow 3 flowing in the first flow path 36 is referred to as the first supply air flow 4.

[0039] The second flow path 37 is a ventilation path that guides the supply air flow 3 in the order of the external gas port 17, the branch windshield 40, the second heat exchanger 35, and the supply port 18. In other words, the first temperature adjustment unit 34 and the second temperature adjustment unit 38 are not passed through in the second flow path 37. In the following description, the supply air flow 3 flowing in the second flow path 37 is referred to as the second supply air flow 5.

[0040] The supply fan 16 is a blower that guides the supply air flow 3 inhaled from the external gas port 17 to the supply port 18. The supply fan 16 is constituted by, for example, a sirocco fan.

[0041] The first heat exchanger 12 performs heat exchange between the exhaust air flow 2 and the supply air flow 3.

[0042] The second heat exchanger 35 performs heat exchange between the first supply air flow 4 and the second supply air flow 5. The second heat exchanger 35 is constituted by laminating a plurality of heat conduction plates and is formed in a cubic shape with an inclined lower surface. The second heat exchanger 35 performs heat exchange via the heat conduction plates between the first supply air flow 4 flowing in the horizontal direction and the second supply air flow 5 flowing in the vertical direction.

[0043] The first temperature adjustment unit 34 cools or heats the temperature of the first supply air flow 4. The first temperature adjustment unit 34 is provided between the first heat exchanger 12 and the second heat exchanger 35 in the first flow path 36 of the supply air duct 7. The first temperature adjustment unit 34 belongs to the refrigeration cycle 30 and functions as an evaporator when the expanded refrigerant is introduced, cooling the temperature of the first supply air flow 4. In addition, the first temperature adjustment unit 34 functions as a condenser when the condensed refrigerant is introduced, heating the temperature of the first supply air flow 4.

[0044] The second temperature regulating unit 38 cools or heats the temperature of the first air supply flow 4. The second temperature regulating unit 38 is disposed at a position downstream of the second heat exchanger 35 in the first flow path 36 of the air supply duct 7. The second temperature regulating unit 38 belongs to the refrigeration cycle 30 and functions as an evaporator when the expanded refrigerant is introduced, cooling the temperature of the first air supply flow 4. Further, the second temperature regulating unit 38 functions as a condenser when the condensed refrigerant is introduced, heating the temperature of the first air supply flow 4.

[0045] The heat exchange type ventilation device 1 of the present invention can achieve a plurality of operation modes by controlling the first temperature regulating unit 34 and the second temperature regulating unit 38 belonging to the refrigeration cycle 30 and controlling the flow path of the air supply flow 3 based on the branch damper 40.

[0046] Next, with reference to Figure 3 、 Figure 4 and Figure 5 the heat exchange type ventilation device 1 in each operation mode will be described. Figure 3 is a schematic diagram of the heat exchange type ventilation device 1 in the case of a refrigeration operation mode, Figure 4 is a schematic diagram of the heat exchange type ventilation device 1 in the case of a heating operation mode, Figure 5 is a schematic diagram of the heat exchange type ventilation device 1 in the case of a dehumidification operation mode.

[0047] The indoor unit 10 includes a second expander 33b and a control device 20.

[0048] The second expander 33b belongs to the refrigeration cycle 30 and is a device that reduces the pressure of the refrigerant and lowers the temperature of the refrigerant. The second expander 33b is disposed in the internal flow path of the indoor unit 10 and between the first temperature regulating unit 34 and the second temperature regulating unit 38 in the refrigeration cycle 30. The second expander 33b can switch between an expanded state in which the refrigerant is depressurized and expanded and an open state in which the refrigerant is not depressurized.

[0049] The control device 20 controls the opening degree of the branch damper 40. Further, the control device 20 independently controls the compressor 31, the first expander 33a, and the second expander 33b respectively. In other words, the control device 20 independently controls the heating or cooling in the first temperature regulating unit 34 belonging to the refrigeration cycle 30 and the heating or cooling in the second temperature regulating unit 38. Further, the control device 20 controls the four-way valve 41 to be able to switch the direction of the cycle in the refrigeration cycle 30. It should be noted that in the present embodiment, the control device 20 is built in the indoor unit 10, but it may also be provided outside the indoor unit 10.

[0050] First, with reference to Figure 3The heat exchange type ventilation device 1 in the refrigeration operation mode will be described.

[0051] When the set operation mode is the refrigeration operation mode, in the refrigeration cycle 30, the refrigerant circulates in the order of the compressor 31, the four-way valve 41, the outdoor unit temperature adjusting unit 39, the first expander 33a, the second temperature adjusting unit 38, the second expander 33b, the first temperature adjusting unit 34, the four-way valve 41, and the compressor 31. In the refrigeration operation mode, the first expander 33a and the second expander 33b are in an expanded state that reduces the pressure of the refrigerant. Moreover, the branch damper 40 is fully closed and only the first supply air flow 4 can be transported.

[0052] Here, the outdoor unit temperature adjusting unit 39 functions as a condenser (outdoor condenser 39b) by introducing the refrigerant compressed by the compressor 31. In addition, the first temperature adjusting unit 34 functions as an evaporator (first evaporator 34a) by introducing the refrigerant expanded by the second expander 33b. In addition, the second temperature adjusting unit 38 functions as an evaporator (second evaporator 38a) by introducing the refrigerant expanded by the first expander 33a.

[0053] With this structure, it is possible to cool the first supply air flow 4 using the first temperature adjusting unit 34 and the second temperature adjusting unit 38 while suppressing pressure loss. It should be noted that in this embodiment, the branch damper 40 is fully closed, but it may also be configured to open the branch damper 40 and utilize the second flow path 37. In addition, when the first expander 33a functions as an evaporator for both the first temperature adjusting unit 34 and the second temperature adjusting unit 38, the second expander 33b may be in an open state.

[0054] Next, refer to Figure 4 The heat exchange type ventilation device 1 in the heating operation mode will be described.

[0055] When the set operation mode is the heating operation mode, in the refrigeration cycle 30, the refrigerant circulates in the order of the compressor 31, the four-way valve 41, the first temperature adjusting unit 34, the second expander 33b, the second temperature adjusting unit 38, the first expander 33a, the outdoor unit temperature adjusting unit 39, the four-way valve 41, and the compressor 31. In the heating operation mode, the first expander 33a is in an expanded state that reduces the pressure of the refrigerant, and the second expander 33b is in an open state that does not reduce the pressure of the refrigerant. Moreover, the branch damper 40 is fully closed and only the first supply air flow 4 can be transported.

[0056] Here, the outdoor unit temperature adjustment unit 39 functions as an evaporator (outdoor evaporator 39a) by having the refrigerant expanded by the first expander 33a introduced therein. Further, the first temperature adjustment unit 34 functions as a condenser (first condenser 34b) by having the refrigerant compressed by the compressor 31 introduced therein. Further, the second temperature adjustment unit 38 also functions as a condenser (second condenser 38b) by having the refrigerant compressed by the compressor 31 introduced therein.

[0057] According to this configuration, it is possible to heat the first air supply flow 4 using the first temperature adjustment unit 34 and the second temperature adjustment unit 38 while suppressing pressure loss. Note that in the present embodiment, the branch air damper 40 is fully closed, but it may be configured to open the branch air damper 40 and utilize the second flow path 37.

[0058] Next, Figure 5 the heat exchange type ventilation device 1 in the case of the dehumidifying operation mode will be described.

[0059] When the set operation mode is the dehumidifying operation mode, in the refrigeration cycle 30, the refrigerant circulates in the order of the compressor 31, the four-way valve 41, the outdoor unit temperature adjustment unit 39, the first expander 33a, the second temperature adjustment unit 38, the second expander 33b, the first temperature adjustment unit 34, the four-way valve 41, and the compressor 31. In the case of the dehumidifying operation mode, the first expander 33a is in an open state where it does not decompress the refrigerant, and the second expander 33b is in an expanded state where it decompresses the refrigerant. Moreover, by opening the branch air damper 40, the air supply flow 3 is branched into a first air supply flow 4 and a second air supply flow 5.

[0060] Here, the outdoor unit temperature adjustment unit 39 functions as a condenser (outdoor condenser 39b) by having the refrigerant compressed by the compressor 31 introduced therein. Further, the first temperature adjustment unit 34 functions as an evaporator (first evaporator 34a) by having the refrigerant compressed by the second expander 33b introduced therein. Further, the second temperature adjustment unit 38 functions as a condenser (second condenser 38b) by having the refrigerant compressed by the compressor 31 introduced therein.

[0061] The first air supply flow 4 in the air supply flow 3 is cooled by the first temperature adjustment unit 34. As a result, the temperature of the first air supply flow 4 becomes below the dew point temperature, and the first air supply flow 4 condenses, so the moisture in the first air supply flow 4 is removed. That is, by flowing through the first temperature adjustment unit 34, the dehumidification of the first air supply flow 4 is performed.

[0062] Moreover, in the second heat exchanger 35, the remaining second supply air flow 5 in the supply air flow 3 exchanges heat with the first supply air flow 4 cooled by the first temperature regulator 34. As a result, the second supply air flow 5 in the second flow path 37 is cooled and dewed, so that the moisture in the second supply air flow 5 is removed. That is, by performing sensible heat exchange using the second heat exchanger 35, dehumidification of the second supply air flow 5 is performed.

[0063] In addition, the first supply air flow 4 can suppress excessive temperature drop caused by dehumidification by being heated by the second temperature regulator 38.

[0064] It should be noted that the moisture generated inside the indoor unit 10 by the first temperature regulator 34 and the second heat exchanger 35 is collected by the water receiving part 19 and discharged to the outside of the house.

[0065] As described above, the heat exchange type ventilation device 1 of the present invention can independently control the state of the refrigerant introduced into the outdoor unit temperature regulator 39, the state of the refrigerant introduced into the first temperature regulator 34, and the state of the refrigerant introduced into the second temperature regulator 38. Therefore, heating or cooling in the first temperature regulator 34 and heating or cooling in the second temperature regulator 38 can be independently controlled. According to this structure, the heat exchange type ventilation device 1 can achieve multiple operation modes, and can perform dehumidification, refrigeration, and / or heating for the entire building.

[0066] It should be noted that in the present embodiment, the refrigeration cycle 30 is composed of a compressor 31, a four-way valve 41, an outdoor unit temperature regulator 39, a first expander 33a, a second temperature regulator 38, a second expander 33b, and a first temperature regulator 34, but is not particularly specified. A structure that can independently control heating or cooling in the first temperature regulator 34 and heating or cooling in the second temperature regulator 38 is sufficient.

[0067] Industrial Applicability

[0068] The heat exchange type ventilation device of the present invention is useful as a heat exchange type ventilation device capable of performing heat exchange between a supply air flow and an exhaust air flow.

[0069] Explanation of Reference Numerals

[0070] 1 Heat exchange type ventilation device

[0071] 2 Exhaust air flow

[0072] 3 Supply air flow

[0073] 4 First supply air flow

[0074] 5 Second supply air flow

[0075] 6 Exhaust air duct

[0076] 7 Air supply air passage

[0077] 8 One side

[0078] 9 Inclined bottom surface

[0079] 10 Indoor unit

[0080] 11 Main body housing

[0081] 12 First heat exchanger

[0082] 13 Exhaust fan

[0083] 14 Internal gas port

[0084] 15 Exhaust port

[0085] 16 Air supply fan

[0086] 17 External gas port

[0087] 18 Air supply port

[0088] 19 Water receiving part

[0089] 20 Control device

[0090] 30 Refrigeration cycle

[0091] 31 Compressor

[0092] 32 Outdoor unit

[0093] 33 Expander

[0094] 33a First expander

[0095] 33b Second expander

[0096] 34 First temperature regulating part

[0097] 34a First evaporator

[0098] 34b First condenser

[0099] 35 Second heat exchanger

[0100] 36 First flow path

[0101] 37 Second flow path

[0102] 38 Second temperature regulating part

[0103] 38a Second evaporator

[0104] 38b Second condenser

[0105] 39 Outdoor unit temperature adjustment section

[0106] 39a Outdoor evaporator

[0107] 39b Outdoor condenser

[0108] 40 Branch air damper

[0109] 41 Four-way valve.

Claims

1. A heat exchange type ventilation device having a plurality of operation modes, wherein, the heat exchange type ventilation device includes: a first heat exchanger that performs heat exchange between an exhaust air flow and a supply air flow; an exhaust air duct that conveys the exhaust air flow; a supply air duct that conveys the supply air flow and branches into a first flow path and a second flow path at a position downstream of the first heat exchanger; a branch damper that adjusts the flow rate of the first flow path and the flow rate of the second flow path; a second heat exchanger that performs heat exchange between a first supply air flow and a second supply air flow, the first supply air flow flowing in the first flow path and the second supply air flow flowing in the second flow path; a first temperature adjustment unit that belongs to a refrigeration cycle and is provided between the first heat exchanger and the second heat exchanger in the supply air duct to cool or heat the first supply air flow; a second temperature adjustment unit that belongs to the refrigeration cycle and is provided at a position downstream of the second heat exchanger in the supply air duct to cool or heat the first supply air flow; an outdoor unit that belongs to the refrigeration cycle; and a control device, the control device independently controls the branch damper, the heating or cooling in the first temperature adjustment unit belonging to the refrigeration cycle, and the heating or cooling in the second temperature adjustment unit based on the set operation mode.

2. The heat exchange type ventilation device according to claim 1, wherein, the heat exchange type ventilation device has a refrigeration operation mode for lowering the temperature of the supply air flow as the operation mode, when the set operation mode is the refrigeration operation mode, the control device can only convey the first supply air flow through the branch damper, causes the first temperature adjustment unit to function as an evaporator in the refrigeration cycle to cool the first supply air flow, and causes the second temperature adjustment unit to function as an evaporator to further cool the first supply air flow.

3. The heat exchange type ventilation device according to claim 1, wherein, the heat exchange type ventilation device has a heating operation mode for raising the temperature of the supply air flow as the operation mode, when the set operation mode is the heating operation mode, the control device can only convey the first supply air flow through the branch damper, causes the first temperature adjustment unit to function as a condenser in the refrigeration cycle to heat the first supply air flow, and causes the second temperature adjustment unit to function as a condenser to further heat the first supply air flow.

4. The heat exchange type ventilation device according to claim 1, wherein, the heat exchange type ventilation device has a dehumidification operation mode for dehumidifying the supply air flow as the operation mode, When the set operation mode of the heat exchange type ventilation device is the dehumidification operation mode, the supply air flow is branched into the first supply air flow and the second supply air flow by the branch air damper, the first temperature adjustment unit functions as an evaporator in the refrigeration cycle to cool the first supply air flow, and the second temperature adjustment unit functions as a condenser in the refrigeration cycle to heat the first supply air flow.

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