Heat exchange type ventilation device

Abstract

To provide technique for improving efficiency of respective operations of plural kinds of operation modes of a heat exchange type ventilation device.SOLUTION: A first temperature adjusting unit 34 cools or heats a supply air current 3 after passing through a first heat exchanger 12 and an exhaust air current 2 before passing through the first heat exchanger 12 on the basis of an operation mode. An exhaust air passage 6 includes a temperature adjustment exhaust air passage 62 in which the exhaust air current 2 passes through the first temperature adjusting unit 34, a first bypass exhaust air passage 64 in which the exhaust air current 2 bypasses the first temperature adjusting unit 34, and a second exhaust air passage switching unit 70 for switching between the temperature adjustment exhaust air passage 62 and the first bypass exhaust air passage 64 on the basis of the operation mode.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a heat exchange ventilation device.

Background Art

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

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When a heat exchange ventilation device has a plurality of types of operation modes, it is required to improve the efficiency of the operation in each operation mode.

[0005] Therefore, the present disclosure solves the above problems, and an object thereof is to provide a technique for improving the efficiency of each operation of a plurality of types of operation modes provided in a heat exchange ventilation device.

Means for Solving the Problems

[0006] In order to solve the above problems, a heat exchange ventilation device according to an aspect of the present disclosure is a heat exchange ventilation device having a refrigeration cycle, and includes an intake air duct that conveys an intake air flow flowing from the outside to the inside, an exhaust air duct that conveys an exhaust air flow flowing from the inside to the outside, a first heat exchanger that performs heat exchange between the intake air flow and the exhaust air flow, an evaporator that belongs to the refrigeration cycle and cools the intake air flow after passing through the first heat exchanger and the exhaust air flow before passing through the first heat exchanger, and a condenser that belongs to the refrigeration cycle and heats the intake air flow after passing through the evaporator.

[0007] In addition, any combination of the above components, as well as those obtained by converting the expressions of the present disclosure among methods, apparatuses, systems, recording media, computer programs, etc., are also effective as aspects of the present disclosure.

Advantages of the Invention

[0008] According to the present disclosure, the efficiency of each operation of a plurality of types of operation modes provided in the heat exchange ventilation apparatus can be improved.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

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Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Modes for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Each of the embodiments described below shows a preferred specific example of the present disclosure. Therefore, the numerical values, shapes, materials, components, arrangement positions and connection forms of the components shown in the following embodiments, as well as the steps (processes) and the order of the steps, etc. are merely examples and are not intended to limit the present disclosure. Therefore, among the components in the following embodiments, the components not described in the independent claims indicating the uppermost concept of the present disclosure are described as arbitrary components. Also, in each figure, the same reference numerals are given to substantially the same configurations, and duplicate explanations are omitted or simplified.

[0011] Figs. 1(a)-(b) show the configuration and operation outline of the dehumidification operation mode in the heat exchange ventilation device 1. Fig. 1(a) shows the configuration of the heat exchange ventilation device 1. The heat exchange ventilation device 1 includes an indoor unit 10 and an outdoor unit 32. The outdoor unit 32 is a device that compresses and expands the refrigerant. The outdoor unit 32 is provided outdoors. The outdoors (outside the house) is the outside of the building, and the indoors (inside the house) is the inside of the building. The outdoor unit 32 forms a refrigeration cycle 30 in which the refrigerant circulates between the indoor unit 10. Here, for example, an alternative refrigerant (HFC134a) is used as the refrigerant in the refrigeration cycle 30. Also, the connection of each device constituting the refrigeration cycle 30 is, for example, connected by welding a copper pipe. The outdoor unit 32 includes a compressor 31, an expander 33 (first expander 33a, second expander 33b), an outdoor unit temperature adjusting unit 39 (outdoor evaporator 39a, outdoor condenser 39b), and a four-way valve 41.

[0012] 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 pressurizes the refrigerant to circulate the refrigeration cycle 30, that is, the refrigerant.

[0013] The first expander 33a 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 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 passes through without being depressurized. 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 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.

[0014] The outdoor unit temperature adjustment unit 39 cools or heats the passing refrigerant by the outside air. The outdoor unit temperature adjustment unit 39 is provided in the internal flow path of the outdoor unit 32 and between the expander 33 (the first expander 33a and the second expander 33b) and the four-way valve 41 described later in the refrigeration cycle. When the outdoor unit temperature adjustment unit 39 functions as the outdoor evaporator 39a, the expanded refrigerant is introduced, and the cold air is released to the outside (the outside air) and heated. On the other hand, when the outdoor unit temperature adjustment unit 39 functions as the outdoor condenser 39b, the condensed refrigerant is introduced, and the heat is released to the outside and cooled.

[0015] The four-way valve 41 belongs to the refrigeration cycle 30 and is a member that switches the flow path of the refrigerant sent out from the compressor 31. The four-way valve 41 can switch between a flow path that allows the compressed refrigerant to flow to the first temperature adjustment unit 34 described later and a flow path that allows the 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 that has flowed into the four-way valve 41 from the outdoor unit temperature adjustment unit 39 to the compressor 31 and guides the refrigerant that has flowed into the four-way valve 41 from the compressor 31 to the first temperature adjustment unit 34. Also, when the compressed refrigerant flows to the outdoor unit temperature adjustment unit 39, the four-way valve 41 guides the refrigerant that has flowed into the four-way valve 41 from the first temperature adjustment unit 34 to the compressor 31 and guides the refrigerant that has flowed into the four-way valve 41 from the compressor 31 to the outdoor unit temperature adjustment unit 39.

[0016] The indoor unit 10 exhausts air outdoors and supplies air indoors. The indoor unit 10 includes a main body case 11, an exhaust suction port 14, an exhaust blowout port 15, an exhaust air passage 6, an air supply suction port 17, an air supply blowout port 18, an air supply air passage 7, a first heat exchanger 12, a second heat exchanger 35, a first temperature adjustment unit 34, and a second temperature adjustment unit 38. Further, the indoor unit 10 also includes an exhaust fan and an air supply fan (not shown). The main body case 11 is the outer frame (housing) of the indoor unit 10. The main body case 11 is formed, for example, in a hollow box shape.

[0017] The exhaust suction port 14 is a suction port that sucks the exhaust flow 2 (air) from indoors into the indoor unit 10. The exhaust suction port 14 is provided, for example, in a circular shape and a duct is connected thereto. The exhaust blowout port 15 is a blowout port that blows the exhaust flow 2 (air) from the indoor unit 10 outdoors. The exhaust blowout port 15 is provided, for example, in a circular shape and a duct is connected thereto. The exhaust air passage 6 is an air passage that communicates the exhaust suction port 14 and the exhaust blowout port 15. Therefore, the exhaust air passage 6 conveys the exhaust flow 2 flowing from indoors to outdoors. The exhaust fan (not shown) is a blower that guides the exhaust flow 2 sucked from the exhaust suction port 14 to the exhaust blowout port 15. The exhaust fan is composed of, for example, a sirocco fan.

[0018] The air supply suction port 17 is a suction port that sucks the air supply flow 3 (air) from outdoors into the indoor unit 10. The air supply suction port 17 is provided, for example, in a circular shape and a duct is connected thereto. The air supply blowout port 18 is a blowout port that blows the air supply flow 3 (air) from the indoor unit 10 to each living room indoors. The air supply blowout port 18 is provided, for example, in a circular shape and a duct is connected thereto. The air supply air passage 7 is an air passage that communicates the air supply suction port 17 and the air supply blowout port 18. Therefore, the air supply air passage 7 conveys the air supply flow 3 flowing from outdoors to indoors. The air supply fan (not shown) is a blower that guides the air supply flow 3 sucked from the air supply suction port 17 to the air supply blowout port 18. The air supply fan is composed of, for example, a sirocco fan.

[0019] The first heat exchanger 12 performs heat exchange between the exhaust flow 2 and the air supply flow 3.

[0020] The first temperature control unit 34 is connected to the first heat exchanger 12 and belongs to the refrigeration cycle 30. When the first temperature control unit 34 functions as the first evaporator 34a, it introduces the expanded refrigerant and cools the supply air flow 3 after passing through the first heat exchanger 12 and the exhaust air flow 2 before passing through the first heat exchanger 12. On the other hand, when the first temperature control unit 34 functions as the first condenser 34b, it introduces the condensed refrigerant and heats the supply air flow 3 after passing through the first heat exchanger 12 and the exhaust air flow 2 before passing through the first heat exchanger 12.

[0021] The second heat exchanger 35 is connected to the first temperature control unit 34. The second heat exchanger 35 performs heat exchange between the supply air flow 3 after passing through the first temperature control unit 34 and before passing through the second temperature control unit 38 and the exhaust air flow 2 before passing through the first temperature control unit 34. The second heat exchanger 35 is, for example, a sheet heat exchanger.

[0022] The second temperature control unit 38 is connected to the second heat exchanger 35 and belongs to the refrigeration cycle 30. When the second temperature control unit 38 functions as the second evaporator 38a, it introduces the expanded refrigerant and cools the supply air flow 3 after passing through the first temperature control unit 34 (the second heat exchanger 35). On the other hand, when the second temperature control unit 38 functions as the second condenser 38b, it introduces the condensed refrigerant and heats the supply air flow 3 after passing through the first temperature control unit 34 (the second heat exchanger 35).

[0023] The heat exchange ventilation device 1 can realize a plurality of operation modes by controlling the first temperature control unit 34 and the second temperature control unit 38 belonging to the refrigeration cycle 30. The plurality of operation modes include, for example, a cooling operation mode, a heating operation mode, and a dehumidifying operation mode.

[0024] The control device 20 controls the compressor 31, the first expander 33a, and the second expander 33b independently. In other words, the control device 20 independently controls the heating or cooling in the first temperature adjustment unit 34 belonging to the refrigeration cycle 30 and the heating or cooling in the second temperature adjustment unit 38. Further, the control device 20 can control the four-way valve 41 to switch the circulation direction in the refrigeration cycle 30. Thus, the control device 20 controls the operation mode. In the present embodiment, the control device 20 is built in the indoor unit 10, but may be provided outside the indoor unit 10.

[0025] The main body case 11 is also provided with an inclined bottom surface (not shown) and a water receiving portion. The inclined bottom surface is a part of the bottom surface of the main body case 11, and is inclined so that the moisture generated inside the indoor unit 10 flows to one side surface (not shown) side of the main body case 11. The inclined bottom surface is provided vertically below the second heat exchanger 35, the first temperature adjustment unit 34, and the second temperature adjustment unit 38. The water receiving portion is a member that collects the moisture guided to the one side surface side by the inclined bottom surface. The water receiving portion is provided on one side surface side of the main body case 11. The water receiving portion can discharge the collected moisture outdoors, for example, by connecting to a drain hose.

[0026] First, the case where the heat exchange ventilation device 1 operates in the dehumidification operation mode among a plurality of operation modes will be described. When the set operation mode is the dehumidification 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 dehumidification operation mode, the first expander 33a is in an open state where it does not depressurize the refrigerant, and the second expander 33b is in an expansion state where it depressurizes the refrigerant.

[0027] Here, the outdoor unit temperature adjustment unit 39 functions as a condenser (outdoor condenser 39b) when the refrigerant compressed by the compressor 31 is introduced. Also, the first temperature adjustment unit 34 functions as an evaporator (first evaporator 34a) when the refrigerant compressed by the second expander 33b is introduced. Further, the second temperature adjustment unit 38 functions as a condenser (second condenser 38b) when the refrigerant compressed by the compressor 31 is introduced.

[0028] As a result, the configuration within the main body case 11 is shown as in Fig. 1(b). Fig. 1(b) shows an outline of the operation in the dehumidifying operation mode of the heat exchange ventilation device 1. The first heat exchanger 12, the first evaporator 34a, the second heat exchanger 35, and the second condenser 38b are arranged in order. The supply air duct 7 is connected from the supply air suction port 17 through the first heat exchanger 12, the first evaporator 34a, the second heat exchanger 35, and the second condenser 38b to the supply air outlet 18. Also, the exhaust air duct 6 is connected from the exhaust air suction port 14 through the second heat exchanger 35, the first evaporator 34a, and the first heat exchanger 12 to the exhaust air outlet 15.

[0029] Here, in the exhaust air duct 6, a first exhaust air duct switching unit 60 is provided at a position before passing through the first temperature adjustment unit 34 (first evaporator 34a). The exhaust air duct 6 branches into a temperature-adjusted exhaust air duct 62 and a first bypass exhaust air duct 64 at the first exhaust air duct switching unit 60. The temperature-adjusted exhaust air duct 62 is a duct for the exhaust air flow 2 to pass through the first temperature adjustment unit 34 (first evaporator 34a), and the first bypass exhaust air duct 64 is a duct for the exhaust air flow 2 to bypass the first temperature adjustment unit 34 (first evaporator 34a). Further, the temperature-adjusted exhaust air duct 62 and the first bypass exhaust air duct 64 are connected at a position after passing through the first temperature adjustment unit 34 (first evaporator 34a).

[0030] In addition, a second exhaust air passage switching unit 70 is provided in the exhaust air passage 6 at a position before passing through the second heat exchanger 35. The exhaust air passage 6 branches into a heat exchange exhaust air passage 72 and a second bypass exhaust air passage 74 at the second exhaust air passage switching unit 70. The heat exchange exhaust air passage 72 is a passage for the exhaust air flow 2 to pass through the second heat exchanger 35, and the second bypass exhaust air passage 74 is a passage for the exhaust air flow 2 to bypass the second heat exchanger 35. Further, the heat exchange exhaust air passage 72 and the second bypass exhaust air passage 74 are connected at a position after passing through the second heat exchanger 35.

[0031] The supply air flow temperature sensor 50 detects the temperature of the supply air flow 3 after passing through the first temperature adjustment unit 34 (the first evaporator 34a) and before passing through the second heat exchanger 35. The supply air flow temperature sensor 50 has a communication function and transmits the detected temperature of the supply air flow 3 to a control device 20 (not shown). The exhaust air flow temperature sensor 52 detects the temperature of the exhaust air flow 2 before passing through the second heat exchanger 35. The exhaust air flow temperature sensor 52 has a communication function and transmits the detected temperature of the exhaust air flow 2 to the control device 20 (not shown).

[0032] The control device 20 receives the temperature of the supply air flow 3 from the supply air flow temperature sensor 50 and receives the temperature of the exhaust air flow 2 from the exhaust air flow temperature sensor 52. Further, the control device 20 includes an operation mode acquisition unit (not shown), and the operation mode acquisition unit acquires the currently set operation mode. The operation mode is any one of a dehumidifying operation mode, a cooling operation mode, and a heating operation mode, but is not limited thereto. Also, the operation mode is set by the user, for example. When the operation mode acquired by the operation mode acquisition unit of the control device 20 is the dehumidifying operation mode, as described above, the first temperature adjustment unit 34 operates as the first evaporator 34a, the second temperature adjustment unit 38 operates as the second condenser 38b, and the outdoor unit temperature adjustment unit 39 operates as the outdoor condenser 39b.

[0033] When the operation mode acquired by the operation mode acquisition unit is the dehumidification operation mode, the control device 20 selects the temperature adjustment exhaust air passage 62 and does not select the first bypass exhaust air passage 64. The control device 20 transmits the selection result to the first exhaust air passage switching unit 60. Also, when the operation mode acquired by the operation mode acquisition unit is the dehumidification operation mode, the control device 20 selects the heat exchange exhaust air passage 72 and does not select the second bypass exhaust air passage 74 regardless of the detection results of the supply air temperature sensor 50 and the exhaust air temperature sensor 52. The control device 20 transmits the selection result to the second exhaust air passage switching unit 70.

[0034] Based on the selection result received from the control device 20, the first exhaust air passage switching unit 60 selects the temperature adjustment exhaust air passage 62 or the first bypass exhaust air passage 64. That is, the first exhaust air passage switching unit 60 opens the temperature adjustment exhaust air passage 62 and closes the first bypass exhaust air passage 64. As a result, the exhaust air flow 2 flows through the temperature adjustment exhaust air passage 62. Based on the selection result received from the control device 20, the second exhaust air passage switching unit 70 selects the heat exchange exhaust air passage 72 or the second bypass exhaust air passage 74. That is, the second exhaust air passage switching unit 70 opens the heat exchange exhaust air passage 72 and closes the second bypass exhaust air passage 74. As a result, the exhaust air flow 2 flows through the second heat exchanger 35.

[0035] In this way, the first exhaust air passage switching unit 60 switches between the temperature adjustment exhaust air passage 62 and the first bypass exhaust air passage 64 based on the operation mode acquired by the operation mode acquisition unit. Also, the second exhaust air passage switching unit 70 switches between the heat exchange exhaust air passage 72 and the second bypass exhaust air passage 74 based on the operation mode acquired by the operation mode acquisition unit.

[0036] The supply air flow 3 sucked in from the supply air inlet 17 is cooled (pre-cooled) by heat exchange with the exhaust air flow 2 in the first heat exchanger 12. The supply air flow 3 from the first heat exchanger 12 is cooled by the first evaporator 34a. As a result, the temperature of the supply air flow 3 becomes equal to or lower than the dew point temperature, and the supply air flow 3 condenses, so that the moisture in the supply air flow 3 is removed. That is, by flowing through the first evaporator 34a, dehumidification of the supply air flow 3 is performed. The moisture generated inside the indoor unit 10 by the first evaporator 34a is collected in the water receiving portion and discharged outdoors.

[0037] The supply air flow 3 from the first evaporator 34a performs heat exchange with the exhaust air flow 2 in the second heat exchanger 35. Thereby, the supply air flow 3 is heated. The supply air flow 3 from the second heat exchanger 35 is heated by the second condenser 38b to suppress an excessive temperature drop due to dehumidification.

[0038] The exhaust air flow 2 sucked in from the exhaust air inlet 14 is cooled (pre-cooled) by heat exchange with the supply air flow 3 in the second heat exchanger 35. The exhaust air flow 2 from the second heat exchanger 35 is cooled by the first evaporator 34a. The exhaust air flow 2 from the second heat exchanger 35 performs heat exchange with the supply air flow 3 in the first heat exchanger 12. Thereby, the exhaust air flow 2 is heated.

[0039] Before the exhaust air flow 2 performs heat exchange with the supply air flow 3 in the first heat exchanger 12, it is cooled in the second heat exchanger 35 and the first evaporator 34a. Therefore, the temperature difference between the exhaust air flow 2 and the supply air flow 3 in the first heat exchanger 12 increases, so that the heat exchange amount increases. As a result, the temperature of the supply air flow 3 flowing into the first evaporator 34a becomes lower, so that the dehumidification efficiency is improved.

[0040] Next, the case where the heat exchange ventilation device 1 operates in the cooling operation mode among a plurality of operation modes will be described. FIGS. 2(a)-(b) show the configuration and operation outline of the cooling operation mode in the heat exchange ventilation device 1. FIG. 2(a) shows the configuration of the heat exchange ventilation device 1. When the set operation mode is the cooling 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 adjuster 39, the first expander 33a, the second temperature adjuster 38, the second expander 33b, the first temperature adjuster 34, the four-way valve 41, and the compressor 31. In the case of the cooling operation mode, the first expander 33a and the second expander 33b are in an expanded state in which the refrigerant is depressurized.

[0041] Here, the outdoor unit temperature adjuster 39 functions as a condenser (outdoor condenser 39b) when the refrigerant compressed by the compressor 31 is introduced. Also, the first temperature adjuster 34 functions as an evaporator (first evaporator 34a) when the refrigerant expanded by the second expander 33b is introduced. Further, the second temperature adjuster 38 functions as an evaporator (second evaporator 38a) when the refrigerant expanded by the first expander 33a is introduced.

[0042] As a result, the configuration inside the main body case 11 is shown as in FIG. 2(b). FIG. 2(b) shows the operation outline of the cooling operation mode in the heat exchange ventilation device 1. The first heat exchanger 12, the first evaporator 34a, the second heat exchanger 35, and the second evaporator 38a are arranged in order. The supply air duct 7 is connected from the supply air suction port 17 to the supply air blowout port 18 via the first heat exchanger 12, the first evaporator 34a, the second heat exchanger 35, and the second evaporator 38a. Also, the exhaust air duct 6 is connected from the exhaust air suction port 14 to the exhaust air blowout port 15 via the first heat exchanger 12. The exhaust air duct 6 may also be connected from the exhaust air suction port 14 to the exhaust air blowout port 15 via the second heat exchanger 35 and the first heat exchanger 12.

[0043] The control device 20 receives the temperature of the supply air flow 3 from the supply air flow temperature sensor 50 and the temperature of the exhaust air flow 2 from the exhaust air flow temperature sensor 52. Further, when the operation mode acquired by the operation mode acquisition unit is the cooling operation mode, as described above, the control device 20 operates the first temperature adjustment unit 34 as the first evaporator 34a, operates the second temperature adjustment unit 38 as the second evaporator 38a, and operates the outdoor unit temperature adjustment unit 39 as the outdoor condenser 39b.

[0044] When the operation mode acquired by the operation mode acquisition unit is the cooling operation mode, the control device 20 selects the first bypass exhaust air path 64 and does not select the temperature adjustment exhaust air path 62. The control device 20 transmits the selection result to the first exhaust air path switching unit 60. Further, when the operation mode acquired by the operation mode acquisition unit is the cooling operation mode, if the temperature of the supply air flow 3 is equal to or higher than the temperature of the exhaust air flow 2, the control device 20 selects the heat exchange exhaust air path 72 and does not select the second bypass exhaust air path 74. On the other hand, when the operation mode acquired by the operation mode acquisition unit is the cooling operation mode, if the temperature of the supply air flow 3 is lower than the temperature of the exhaust air flow 2, the control device 20 selects the second bypass exhaust air path 74 and does not select the heat exchange exhaust air path 72. The control device 20 transmits the selection result to the second exhaust air path switching unit 70.

[0045] Based on the selection result received from the control device 20, the first exhaust air path switching unit 60 selects the temperature adjustment exhaust air path 62 or the first bypass exhaust air path 64. That is, the first exhaust air path switching unit 60 opens the first bypass exhaust air path 64 and closes the temperature adjustment exhaust air path 62. As a result, the exhaust air flow 2 does not flow through the temperature adjustment exhaust air path 62. Based on the selection result received from the control device 20, the second exhaust air path switching unit 70 selects the heat exchange exhaust air path 72 or the second bypass exhaust air path 74. That is, when the temperature of the supply air flow 3 is equal to or higher than the temperature of the exhaust air flow 2, the second exhaust air path switching unit 70 opens the heat exchange exhaust air path 72 and closes the second bypass exhaust air path 74. As a result, the exhaust air flow 2 flows through the second heat exchanger 35. On the other hand, when the temperature of the supply air flow 3 is lower than the temperature of the exhaust air flow 2, the second exhaust air path switching unit 70 opens the second bypass exhaust air path 74 and closes the heat exchange exhaust air path 72. As a result, the exhaust air flow 2 does not flow through the second heat exchanger 35.

[0046] The control device 20 may determine the opening degree of the heat exchange exhaust air passage 72 and the opening degree of the second bypass exhaust air passage 74, for example, in a ratio of 6:4 according to the temperature of the supply air flow 3 and the temperature of the exhaust air flow 2. The second exhaust air passage switching unit 70 may adjust the opening degree of the heat exchange exhaust air passage 72 and the opening degree of the second bypass exhaust air passage 74 based on the opening degree information received from the control device 20.

[0047] In this way, the first exhaust air passage switching unit 60 switches the temperature adjustment exhaust air passage 62 and the first bypass exhaust air passage 64 based on the operation mode acquired by the operation mode acquisition unit. Also, the second exhaust air passage switching unit 70 switches the heat exchange exhaust air passage 72 and the second bypass exhaust air passage 74 based on the operation mode, the temperature of the supply air flow 3, and the temperature of the exhaust air flow 2.

[0048] The supply air flow 3 sucked in from the supply air inlet 17 is cooled (pre-cooled) by heat exchange with the exhaust air flow 2 in the first heat exchanger 12. The supply air flow 3 from the first heat exchanger 12 is cooled by the first evaporator 34a. When the temperature of the supply air flow 3 is equal to or higher than the temperature of the exhaust air flow 2, the supply air flow 3 from the first evaporator 34a performs heat exchange with the exhaust air flow 2 in the second heat exchanger 35. Thereby, the supply air flow 3 is cooled. On the other hand, when the temperature of the supply air flow 3 is lower than the temperature of the exhaust air flow 2, no heat exchange occurs in the second heat exchanger 35. Further, the supply air flow 3 is cooled by the second evaporator 38a.

[0049] The exhaust air flow 2 sucked in from the exhaust air inlet 14 is heated by heat exchange with the supply air flow 3 in the second heat exchanger 35 when the temperature of the supply air flow 3 is equal to or higher than the temperature of the exhaust air flow 2. On the other hand, the exhaust air flow 2 sucked in from the exhaust air inlet 14 does not undergo heat exchange when the temperature of the supply air flow 3 is lower than the temperature of the exhaust air flow 2. The exhaust air flow 2 performs heat exchange with the supply air flow 3 in the first heat exchanger 12. Thereby, the exhaust air flow 2 is heated.

[0050] Next, the case where the heat exchange ventilation device 1 operates in the heating operation mode among a plurality of operation modes will be described. FIGS. 3(a)-(b) show the configuration and operation outline of the heating operation mode in the heat exchange ventilation device 1. FIG. 3(a) shows the configuration of the heat exchange ventilation device 1. 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 adjustment unit 34, the second expander 33b, the second temperature adjustment unit 38, the first expander 33a, the outdoor unit temperature adjustment unit 39, the four-way valve 41, and the compressor 31. In the case of 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.

[0051] Here, the outdoor unit temperature adjustment unit 39 functions as an evaporator (outdoor evaporator 39a) when the refrigerant expanded by the first expander 33a is introduced. Also, the first temperature adjustment unit 34 functions as a condenser (first condenser 34b) when the refrigerant compressed by the compressor 31 is introduced. Further, the second temperature adjustment unit 38 also functions as a condenser (second condenser 38b) when the refrigerant compressed by the compressor 31 is introduced.

[0052] As a result, the configuration inside the main body case 11 is shown as in FIG. 3(b). FIG. 3(b) shows the operation outline of the heating operation mode in the heat exchange ventilation device 1. The first heat exchanger 12, the first condenser 34b, the second heat exchanger 35, and the second condenser 38b are arranged in order. The supply air duct 7 is connected from the supply air suction port 17 to the supply air blowout port 18 via the first heat exchanger 12, the first condenser 34b, the second heat exchanger 35, and the second condenser 38b. Also, the exhaust air duct 6 is connected from the exhaust air suction port 14 to the exhaust air blowout port 15 via the first heat exchanger 12. The exhaust air duct 6 may also be connected from the exhaust air suction port 14 to the exhaust air blowout port 15 via the second heat exchanger 35 and the first heat exchanger 12.

[0053] The control device 20 receives the temperature of the supply air flow 3 from the supply air flow temperature sensor 50 and the temperature of the exhaust air flow 2 from the exhaust air flow temperature sensor 52. Also, when the operation mode acquired by the operation mode acquisition unit is the heating operation mode, as described above, the control device 20 operates the first temperature adjustment unit 34 as the first condenser 34b, operates the second temperature adjustment unit 38 as the second condenser 38b, and operates the outdoor unit temperature adjustment unit 39 as the outdoor evaporator 39a.

[0054] When the operation mode acquired by the operation mode acquisition unit is the heating operation mode, the control device 20 selects the first bypass exhaust air duct 64 and does not select the temperature adjustment exhaust air duct 62. The control device 20 transmits the selection result to the first exhaust air duct switching unit 60. Also, when the operation mode acquired by the operation mode acquisition unit is the heating operation mode, if the temperature of the supply air flow 3 is lower than the temperature of the exhaust air flow 2, the control device 20 selects the heat exchange exhaust air duct 72 and does not select the second bypass exhaust air duct 74. On the other hand, when the operation mode acquired by the operation mode acquisition unit is the heating operation mode, if the temperature of the supply air flow 3 is equal to or higher than the temperature of the exhaust air flow 2, the control device 20 selects the second bypass exhaust air duct 74 and does not select the heat exchange exhaust air duct 72. The control device 20 transmits the selection result to the second exhaust air duct switching unit 70.

[0055] Based on the selection result received from the control device 20, the first exhaust air duct switching unit 60 selects the temperature adjustment exhaust air duct 62 or the first bypass exhaust air duct 64. That is, the first exhaust air duct switching unit 60 opens the first bypass exhaust air duct 64 and closes the temperature adjustment exhaust air duct 62. As a result, the exhaust air flow 2 does not flow through the temperature adjustment exhaust air duct 62. Based on the selection result received from the control device 20, the second exhaust air duct switching unit 70 selects the heat exchange exhaust air duct 72 or the second bypass exhaust air duct 74. That is, when the temperature of the supply air flow 3 is lower than the temperature of the exhaust air flow 2, the second exhaust air duct switching unit 70 opens the heat exchange exhaust air duct 72 and closes the second bypass exhaust air duct 74. As a result, the exhaust air flow 2 flows through the second heat exchanger 35. On the other hand, when the temperature of the supply air flow 3 is equal to or higher than the temperature of the exhaust air flow 2, the second exhaust air duct switching unit 70 opens the second bypass exhaust air duct 74 and closes the heat exchange exhaust air duct 72. As a result, the exhaust air flow 2 does not flow through the second heat exchanger 35.

[0056] The control device 20 may determine the opening degree of the heat exchange exhaust air passage 72 and the opening degree of the second bypass exhaust air passage 74, for example, in a ratio of 6:4 according to the temperature of the supply air flow 3 and the temperature of the exhaust air flow 2. The second exhaust air passage switching unit 70 may adjust the opening degree of the heat exchange exhaust air passage 72 and the opening degree of the second bypass exhaust air passage 74 based on the opening degree information received from the control device 20.

[0057] In this way, the first exhaust air passage switching unit 60 switches between the temperature adjustment exhaust air passage 62 and the first bypass exhaust air passage 64 based on the operation mode acquired by the operation mode acquisition unit. Further, the second exhaust air passage switching unit 70 switches between the heat exchange exhaust air passage 72 and the second bypass exhaust air passage 74 based on the operation mode, the temperature of the supply air flow 3, and the temperature of the exhaust air flow 2.

[0058] The supply air flow 3 sucked in from the supply air inlet 17 is heated by heat exchange with the exhaust air flow 2 in the first heat exchanger 12. The supply air flow 3 from the first heat exchanger 12 is heated by the first condenser 34b. When the temperature of the supply air flow 3 is lower than the temperature of the exhaust air flow 2, the supply air flow 3 from the first condenser 34b performs heat exchange with the exhaust air flow 2 in the second heat exchanger 35. Thereby, the supply air flow 3 is heated. On the other hand, when the temperature of the supply air flow 3 is equal to or higher than the temperature of the exhaust air flow 2, no heat exchange occurs in the second heat exchanger 35. Further, the supply air flow 3 is heated by the second condenser 38b.

[0059] The exhaust air flow 2 sucked in from the exhaust air inlet 14 is cooled by heat exchange with the supply air flow 3 in the second heat exchanger 35 when the temperature of the supply air flow 3 is lower than the temperature of the exhaust air flow 2. On the other hand, the exhaust air flow 2 sucked in from the exhaust air inlet 14 does not undergo heat exchange when the temperature of the supply air flow 3 is equal to or higher than the temperature of the exhaust air flow 2. The exhaust air flow 2 performs heat exchange with the supply air flow 3 in the first heat exchanger 12. Thereby, the exhaust air flow 2 is cooled.

[0060] FIG. 4 is a flowchart showing an operation procedure by the heat exchange ventilation device 1. The operation of the heat exchange ventilation device 1 is started (S10). The operation mode acquisition unit acquires the operation mode (S12). When the operation mode is the dehumidification operation mode (Y in S14), the exhaust flow 2 is conveyed through the temperature adjustment exhaust air passage 62 and the heat exchange exhaust air passage 72 (S16). When the operation mode is not the dehumidification operation mode (N in S14) and is the cooling operation mode (Y in S18), if the temperature of the supply air flow 3 is not equal to or higher than the temperature of the exhaust air flow 2 (N in S20), the exhaust air flow 2 is conveyed through the first bypass exhaust air passage 64 and the second bypass exhaust air passage 74 (S22). If the temperature of the supply air flow 3 is equal to or higher than the temperature of the exhaust air flow 2 (Y in S20), the exhaust air flow 2 is conveyed through the first bypass exhaust air passage 64 and the heat exchange exhaust air passage 72 (S24).

[0061] When it is not the cooling operation mode (N in S18), if the temperature of the supply air flow 3 is not less than the temperature of the exhaust air flow 2 (N in S26), the exhaust air flow 2 is conveyed through the first bypass exhaust air passage 64 and the second bypass exhaust air passage 74 (S28). If the temperature of the supply air flow 3 is less than the temperature of the exhaust air flow 2 (Y in S26), the exhaust air flow 2 is conveyed through the first bypass exhaust air passage 64 and the heat exchange exhaust air passage 72 (S30).

[0062] (Modification 1) Description is given to Modification Example 1 of the present embodiment. Modification Example 1 is an example with a simpler configuration than FIGS. 1(b), 2(b), and 3(b). FIGS. 5(a)-(c) show an overview of the operation of the heat exchange ventilation device 1. FIG. 5(a) shows the case of the dehumidification operation mode. Compared with FIG. 1(b), the second heat exchanger 35 is not included, and the first heat exchanger 12, the first evaporator 34a, and the second condenser 38b are arranged in order. Also, the exhaust air passage 6 does not include the second exhaust air passage switching section 70, the heat exchange exhaust air passage 72, and the second bypass exhaust air passage 74. The first exhaust air passage switching section 60 opens the temperature adjustment exhaust air passage 62 and closes the first bypass exhaust air passage 64. The supply air passage 7 is connected from the supply air inlet 17 to the supply air outlet 18 via the first heat exchanger 12, the first evaporator 34a, and the second condenser 38b. Also, the exhaust air passage 6 is connected from the exhaust air inlet 14 to the exhaust air outlet 15 via the first evaporator 34a and the first heat exchanger 12. The processing in such a configuration is only that the heat exchange in the second heat exchanger 35 is not performed compared with FIG. 1(b), so the description is omitted here.

[0063] FIG. 5(b) shows the case of the cooling operation mode. Compared with FIG. 2(b), the second heat exchanger 35 is not included, and the first heat exchanger 12, the first evaporator 34a, and the second evaporator 38a are arranged in order. Also, the exhaust air passage 6 does not include the second exhaust air passage switching section 70, the heat exchange exhaust air passage 72, and the second bypass exhaust air passage 74. The first exhaust air passage switching section 60 opens the first bypass exhaust air passage 64 and closes the temperature adjustment exhaust air passage 62. The supply air passage 7 is connected from the supply air inlet 17 to the supply air outlet 18 via the first heat exchanger 12, the first evaporator 34a, and the second evaporator 38a. Also, the exhaust air passage 6 is connected from the exhaust air inlet 14 to the exhaust air outlet 15 via the first heat exchanger 12. The processing in such a configuration is only that the heat exchange in the second heat exchanger 35 is not performed compared with FIG. 2(b), so the description is omitted here.

[0064] FIG. 5(c) shows the case of the heating operation mode. Compared with FIG. 3(b), the second heat exchanger 35 is not included, and the first heat exchanger 12, the first condenser 34b, and the second condenser 38b are arranged in order. Also, the exhaust air passage 6 does not include the second exhaust air passage switching unit 70, the heat exchange exhaust air passage 72, and the second bypass exhaust air passage 74. The first exhaust air passage switching unit 60 opens the first bypass exhaust air passage 64 and closes the temperature adjustment exhaust air passage 62. The supply air passage 7 is connected from the supply air inlet 17 to the supply air outlet 18 via the first heat exchanger 12, the first evaporator 34a, and the second condenser 38b. Also, the exhaust air passage 6 is connected from the exhaust air inlet 14 to the exhaust air outlet 15 via the first heat exchanger 12. The processing in such a configuration is only that the heat exchange in the second heat exchanger 35 is not performed compared with FIG. 3(b), so the description is omitted here.

[0065] (Modification 2) Modification 2 of the present embodiment will be described. In Modification 2, a circulation air passage 80 branched from the exhaust air passage 6 and connected to the supply air passage 7 is provided. FIGS. 6(a)-(c) show an outline of the operation of the heat exchange ventilation device 1. FIG. 6(a) shows the case of the dehumidifying operation mode. Similar to Modification 1, the first heat exchanger 12, the first evaporator 34a, and the second condenser 38b are arranged in order. The supply air passage 7 is connected from the supply air inlet 17 to the supply air outlet 18 via the first heat exchanger 12, the first evaporator 34a, and the second condenser 38b. Also, the exhaust air passage 6 is connected from the exhaust air inlet 14 to the exhaust air outlet 15 via the first evaporator 34a and the first heat exchanger 12.

[0066] A branch position 82 is provided at the exhaust air inlet 14 of the exhaust air duct 6. At the branch position 82, a circulation air duct 80 branches off from the exhaust air duct 6, and the circulation air duct 80 is connected to the supply air duct 7 at a confluence position 84. The confluence position 84 is a position in the supply air duct 7 after passing through the first heat exchanger 12 and before passing through the first evaporator 34a. By communicating the exhaust air duct 6 and the supply air duct 7, the circulation air duct 80 merges the exhaust air flow 2 into the supply air flow 3 after passing through the first heat exchanger 12 and before passing through the first evaporator 34a. Since the supply air flow 3 is blown out from the heat exchange ventilation device 1, the exhaust air flow 2 is dehumidified to some extent. Therefore, by merging a part of the exhaust air flow 2 into the supply air flow 3 and then passing it through the first evaporator 34a, a part of the exhaust air flow 2 is reused as the supply air flow 3.

[0067] Fig. 6(b) shows the case of the cooling operation mode. Similar to the first modification, the first heat exchanger 12, the first evaporator 34a, and the second evaporator 38a are arranged in order. The supply air duct 7 is connected from the supply air inlet 17 to the supply air outlet 18 via the first heat exchanger 12, the first evaporator 34a, and the second evaporator 38a. Also, the exhaust air duct 6 is connected from the exhaust air inlet 14 to the exhaust air outlet 15 via the first heat exchanger 12.

[0068] A branch position 82 is provided at the exhaust air inlet 14 of the exhaust air duct 6. At the branch position 82, a circulation air duct 80 branches off from the exhaust air duct 6, and the circulation air duct 80 is connected to the supply air duct 7 at a confluence position 84. The confluence position 84 is a position in the supply air duct 7 after passing through the first heat exchanger 12 and before passing through the first evaporator 34a. By communicating the exhaust air duct 6 and the supply air duct 7, the circulation air duct 80 merges the exhaust air flow 2 into the supply air flow 3 after passing through the first heat exchanger 12 and before passing through the first evaporator 34a. Since the supply air flow 3 is blown out from the heat exchange ventilation device 1, the exhaust air flow 2 is cooled to some extent. Therefore, by merging a part of the exhaust air flow 2 into the supply air flow 3 and then passing it through the first evaporator 34a, a part of the exhaust air flow 2 is reused as the supply air flow 3.

[0069] FIG. 6(c) shows the case of the heating operation mode. Similar to Modification 1, the first heat exchanger 12, the first condenser 34b, and the second condenser 38b are arranged in order. The supply air duct 7 is connected from the supply air inlet 17 to the supply air outlet 18 via the first heat exchanger 12, the second condenser 38b, and the second condenser 38b. Further, the exhaust air duct 6 is connected from the exhaust air inlet 14 to the exhaust air outlet 15 via the first heat exchanger 12.

[0070] A branch position 82 is provided at the exhaust air inlet 14 of the exhaust air duct 6. At the branch position 82, a circulation air duct 80 branches off from the exhaust air duct 6, and the circulation air duct 80 is connected to the supply air duct 7 at a merging position 84. The merging position 84 is a position in the supply air duct 7 after passing through the first heat exchanger 12 and before passing through the first condenser 34b. By communicating the exhaust air duct 6 and the supply air duct 7, the circulation air duct 80 merges the exhaust air flow 2 into the supply air flow 3 after passing through the first heat exchanger 12 and before passing through the first condenser 34b. Since the supply air flow 3 is blown out from the heat exchange and ventilation device 1, the exhaust air flow 2 is warmed to some extent. Therefore, by passing a part of the exhaust air flow 2 through the first evaporator 34a after merging it into the supply air flow 3, a part of the exhaust air flow 2 is reused as the supply air flow 3.

[0071] (Modification 3) Modification 3 of the present embodiment will be described. Modification 3 includes a circulation air duct 80 similar to Modification 2. However, the position of the branch position 82 is different from that of Modification 2. FIGS. 7(a)-(c) show an outline of the operation of the heat exchange and ventilation device 1. FIG. 7(a) shows the case of the dehumidifying operation mode. Compared with FIG. 6(a), FIG. 7(a) shows that in the exhaust air duct 6, the branch position 82 is provided in a portion after passing through the first evaporator 34a and before passing through the first heat exchanger 12. FIG. 7(b) shows the case of the cooling operation mode. Compared with FIG. 6(b), FIG. 7(b) shows that in the exhaust air duct 6, the branch position 82 is provided in a portion after passing through the first evaporator 34a and before passing through the first heat exchanger 12. FIG. 7(c) shows the case of the heating operation mode. Compared with FIG. 6(c), FIG. 7(c) shows that in the exhaust air duct 6, the branch position 82 is provided in a portion after passing through the first condenser 34b and before passing through the first heat exchanger 12.

[0072] (Modification Example 4) A modification example 4 of this embodiment will be described. The modification example 4 includes a circulation air passage 80 as in the modification examples 2 and 3. However, the position of the branch position 82 is different from that of the modification examples 2 and 3. FIGS. 8(a)-(d) show an outline of the operation of the heat exchange ventilation device 1. FIG. 8(a) shows the dehumidification operation mode. In FIG. 8(a), in the exhaust air passage 6 of FIG. 1(b), a branch position 82 is provided in a portion before passing through the second heat exchanger 35. At the branch position 82, the circulation air passage 80 branches off from the exhaust air passage 6, and the circulation air passage 80 is connected to the supply air passage 7 at the confluence position 84. The confluence position 84 is a position in the supply air passage 7 after passing through the first heat exchanger 12 and before passing through the first evaporator 34a. By communicating the exhaust air passage 6 and the supply air passage 7, the circulation air passage 80 merges the exhaust air flow 2 into the supply air flow 3 after passing through the first heat exchanger 12 and before passing through the first evaporator 34a.

[0073] FIG. 8(b) shows the dehumidification operation mode. In FIG. 8(b), in the exhaust air passage 6 of FIG. 1(b), a branch position 82 is provided in a portion before passing through the second heat exchanger 35. At the branch position 82, the circulation air passage 80 branches off from the exhaust air passage 6, and the circulation air passage 80 leads to the supply air outlet 18 via the first evaporator 34a, the second heat exchanger 35, and the second condenser 38b.

[0074] FIG. 8(c) shows the cooling operation mode. In FIG. 8(c), in the exhaust air passage 6 of FIG. 2(b), a branch position 82 is provided in a portion before passing through the second heat exchanger 35. At the branch position 82, the circulation air passage 80 branches off from the exhaust air passage 6, and the circulation air passage 80 leads to the supply air outlet 18 via the first evaporator 34a, the second heat exchanger 35, and the second evaporator 38a.

[0075] FIG. 8(d) shows the heating operation mode. In FIG. 8(d), in the exhaust air passage 6 of FIG. 3(b), a branch position 82 is provided in a portion before passing through the second heat exchanger 35. At the branch position 82, the circulation air passage 80 branches off from the exhaust air passage 6, and the circulation air passage 80 leads to the supply air outlet 18 via the first condenser 34b, the second heat exchanger 35, and the second condenser 38b.

[0076] (Modification Example 5) Modification Example 5 of this embodiment will be described. Modification Example 5 includes a circulation air passage 80 as in Modification Example 4. However, the positions of the branch position 82 and the confluence position 84 are different from those in Modification Example 4. FIGS. 9(a)-(c) show an overview of the operation of the heat exchange ventilation apparatus 1. FIG. 9(a) shows the dehumidifying operation mode. In FIG. 9(a), in the exhaust air passage 6 of FIG. 1(b), a branch position 82 is provided at a portion after passing through the second heat exchanger 35 and before passing through the first evaporator 34a. At the branch position 82, the circulation air passage 80 branches off from the exhaust air passage 6, and the circulation air passage 80 is connected to the supply air passage 7 at the confluence position 84. The confluence position 84 is a position in the supply air passage 7 after passing through the second heat exchanger 35 and before passing through the second condenser 38b. By communicating the exhaust air passage 6 and the supply air passage 7, the circulation air passage 80 merges the exhaust air flow 2 after passing through the second heat exchanger 35 and before passing through the first evaporator 34a into the supply air flow 3 after passing through the second heat exchanger 35 and before passing through the second condenser 38b.

[0077] FIG. 9(b) shows the cooling operation mode. In FIG. 9(b), in the exhaust air passage 6 of FIG. 2(b), a branch position 82 is provided at a portion after passing through the second heat exchanger 35 and before passing through the first heat exchanger 12. At the branch position 82, the circulation air passage 80 branches off from the exhaust air passage 6, and the circulation air passage 80 is connected to the supply air passage 7 at the confluence position 84. The confluence position 84 is a position in the supply air passage 7 after passing through the second heat exchanger 35 and before passing through the second evaporator 38a. By communicating the exhaust air passage 6 and the supply air passage 7, the circulation air passage 80 merges the exhaust air flow 2 after passing through the second heat exchanger 35 and before passing through the first heat exchanger 12 into the supply air flow 3 after passing through the second heat exchanger 35 and before passing through the second evaporator 38a.

[0078] FIG. 9(c) shows the heating operation mode. In FIG. 9(c), in the exhaust air duct 6 of FIG. 3(b), a branch position 82 is provided at a portion after passing through the second heat exchanger 35 and before passing through the first heat exchanger 12. At the branch position 82, a circulation air duct 80 branches off from the exhaust air duct 6, and the circulation air duct 80 is connected to the supply air duct 7 at a confluence position 84. The confluence position 84 is a position in the supply air duct 7 after passing through the second heat exchanger 35 and before passing through the second condenser 38b. By communicating the exhaust air duct 6 and the supply air duct 7, the circulation air duct 80 merges the exhaust air flow 2 after passing through the second heat exchanger 35 and before passing through the first heat exchanger 12 into the supply air flow 3 after passing through the second heat exchanger 35 and before passing through the second condenser 38b.

[0079] (Modification Example 6) Modification Example 6 of this embodiment will be described. In Modification Example 6, an air return duct 90 that is separate from the exhaust air duct 6 and connected to the supply air duct 7 is provided. FIGS. 10(a)-(c) show an outline of the operation of the heat exchange ventilation device 1. FIG. 10(a) shows the dehumidifying operation mode. In FIG. 10(a), in addition to the configuration of FIG. 1(b), an air return inlet 92 that sucks air from indoors independently of the exhaust air inlet 14 is provided, and an air return duct 90 extends from the air return inlet 92. The air return duct 90 is connected to the supply air duct 7 at a confluence position 94. The confluence position 94 is a position in the supply air duct 7 after passing through the first heat exchanger 12 and before passing through the first evaporator 34a. The air return duct 90 merges the indoor air sucked from the air return inlet 92 into the supply air flow 3 after passing through the first heat exchanger 12 and before passing through the first evaporator 34a.

[0080] In Fig. 10(b), in addition to the configuration of Fig. 2(b), a return air intake port 92 for sucking air from indoors independently of the exhaust air intake port 14 is provided, and a return air duct 90 extends from the return air intake port 92. The return air duct 90 is connected to the supply air duct 7 at a confluence position 94. The confluence position 94 is a position in the supply air duct 7 after passing through the first heat exchanger 12 and before passing through the first evaporator 34a. The return air duct 90 merges the indoor air sucked from the return air intake port 92 into the supply air flow 3 after passing through the first heat exchanger 12 and before passing through the first evaporator 34a.

[0081] In Fig. 10(c), in addition to the configuration of Fig. 3(b), a return air intake port 92 for sucking air from indoors independently of the exhaust air intake port 14 is provided, and a return air duct 90 extends from the return air intake port 92. The return air duct 90 is connected to the supply air duct 7 at a confluence position 94. The confluence position 94 is a position in the supply air duct 7 after passing through the first heat exchanger 12 and before passing through the first condenser 34b. The return air duct 90 merges the indoor air sucked from the return air intake port 92 into the supply air flow 3 after passing through the first heat exchanger 12 and before passing through the first condenser 34b.

[0082] The subject of the apparatus, system, or method in this disclosure includes a computer. By executing a program on this computer, the functions of the subject of the apparatus, system, or method in this disclosure are realized. The computer mainly includes a processor that operates according to the program as a hardware configuration. The type of the processor is not limited as long as it can realize functions by executing the program. The processor is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or LSI (Large Scale Integration). The plurality of electronic circuits may be integrated on one chip or provided on a plurality of chips. The plurality of chips may be integrated into one device or provided in a plurality of devices. The program is recorded on a non-transitory recording medium such as a computer-readable ROM, optical disk, or hard disk drive. The program may be pre-stored in the recording medium or supplied to the recording medium via a wide-area communication network including the Internet or the like.

[0083] According to this embodiment, since the temperature-adjusting exhaust air passage 62 and the first bypass exhaust air passage 64 are switched based on the operation mode, it is possible to switch whether or not to pass through the first temperature adjusting unit 34. Further, since whether or not to pass through the first temperature adjusting unit 34 is switched, the efficiency of the operation of each of the plurality of types of operation modes provided in the heat exchange type ventilation device 1 can be improved. Further, when the operation mode is the dehumidifying operation mode, the exhaust air flow 2 before passing through the first heat exchanger 12 is cooled, and then heat exchange is performed between the supply air flow 3 and the exhaust air flow 2 in the first heat exchanger 12, so that the temperature difference between the supply air flow 3 and the exhaust air flow 2 in the first heat exchanger 12 can be increased. Further, since the temperature difference between the supply air flow 3 and the exhaust air flow 2 in the first heat exchanger 12 is increased, the heat exchange amount in the first heat exchanger 12 can be increased. Further, since the heat exchange amount is increased, the dehumidifying efficiency in the heat exchange type ventilation device 1 can be improved. Further, when the operation mode is the cooling operation mode, since the exhaust air flow 2 is not cooled by the first evaporator 34a, an increase in the power consumption of the first evaporator 34a can be suppressed. Further, since an increase in the power consumption of the first evaporator 34a is suppressed, the cooling efficiency can be improved. Further, when the operation mode is the heating operation mode, since the exhaust air flow 2 is not heated by the first condenser 34b, an increase in the power consumption of the first condenser 34b can be suppressed. Further, since an increase in the power consumption of the first condenser 34b is suppressed, the heating efficiency can be improved.

[0084] Also, when the operation mode is the dehumidifying operation mode or the heating operation mode, the second condenser 38b heats the supply air flow 3, and when the operation mode is the cooling operation mode, the second evaporator 38a cools the supply air flow 3, so that an operation according to the operation mode can be executed. Further, based on the operation mode, the temperature of the supply air flow 3, and the temperature of the exhaust air flow 2, it is switched whether or not to pass through the second heat exchanger 35, so that an operation according to the situation can be executed. Also, when the operation mode is the dehumidifying operation mode, heat exchange is performed between the supply air flow 3 and the exhaust air flow 2 also in the second heat exchanger 35 regardless of the detection results of the supply air temperature sensor 50 and the exhaust air temperature sensor 52, so that the temperature difference between the supply air flow 3 and the exhaust air flow 2 in the first heat exchanger 12 can be further increased. Also, since the temperature difference between the supply air flow 3 and the exhaust air flow 2 in the first heat exchanger 12 is further increased, the heat exchange amount in the first heat exchanger 12 can be further increased. Also, since the heat exchange amount is further increased, the dehumidifying efficiency in the heat exchange type ventilation device 1 can be further improved. Also, when the operation mode is the cooling operation mode and the temperature of the supply air flow 3 is equal to or higher than the temperature of the exhaust air flow 2, heat exchange is performed between the supply air flow 3 and the supply air flow 3 in the second heat exchanger 35, so that the supply air flow 3 can be cooled. Also, when the operation mode is the heating operation mode and the temperature of the supply air flow 3 is lower than the temperature of the exhaust air flow 2, heat exchange is performed between the supply air flow 3 and the supply air flow 3 in the second heat exchanger 35, so that the supply air flow 3 can be heated.

[0085] Also, the exhaust air flow 2 is made to merge into the supply air flow 3 after passing through the first heat exchanger 12 and before passing through the first temperature adjustment unit 34, so that the exhaust air flow 2 can be reused. Also, the exhaust air flow 2 after passing through the second heat exchanger 35 and before passing through the first temperature adjustment unit 34 is made to merge into the supply air flow 3 after passing through the second heat exchanger 35 and before passing through the second temperature adjustment unit 38, so that the exhaust air flow 2 can be reused. Also, the indoor air sucked from the return air suction port 92 is made to merge into the supply air flow 3 after passing through the first heat exchanger 12 and before passing through the first temperature adjustment unit 34, so that the indoor air can be reused.

[0086] The outline of one aspect of the present disclosure is as follows. (Item 1) A heat exchange ventilation device (1) having a refrigeration cycle (30) and capable of setting a plurality of operation modes, an operation mode acquisition unit that acquires the operation mode being set; an air supply duct (7) that conveys an air supply flow (3) flowing from the outside to the inside; an exhaust duct (6) that conveys an exhaust flow (2) flowing from the inside to the outside; a first heat exchanger (12) that performs heat exchange between the air supply flow (3) and the exhaust flow (2); a first temperature adjustment unit (34) that belongs to the refrigeration cycle (30) and cools or heats the air supply flow (3) after passing through the first heat exchanger (12) and the exhaust flow (2) before passing through the first heat exchanger (12) based on the operation mode acquired by the operation mode acquisition unit; and the exhaust duct (6) includes a temperature adjustment exhaust duct (62) through which the exhaust flow (2) passes through the first temperature adjustment unit (34); a first bypass exhaust duct (64) through which the exhaust flow (2) bypasses the first temperature adjustment unit (34); a first exhaust duct switching unit (60) that switches between the temperature adjustment exhaust duct (62) and the first bypass exhaust duct (64) based on the operation mode acquired by the operation mode acquisition unit; and the heat exchange ventilation device (1) comprising the same.

[0087] (Item 2) When the operation mode acquired by the operation mode acquisition unit is a dehumidification mode, the first exhaust duct switching unit (60) conveys the exhaust flow (2) to the temperature adjustment exhaust duct (62), and the first temperature adjustment unit (34) cools the air supply flow (3) after passing through the first heat exchanger (12) and the exhaust flow (2) before passing through the first heat exchanger (12). The heat exchange ventilation device (1) according to claim 1.

[0088] (Item 3) When the operation mode acquired by the operation mode acquisition unit is a cooling mode, The first exhaust air passage switching unit (60) conveys the exhaust air flow (2) to the first bypass exhaust air passage (64). The heat exchange type ventilation device (1) according to claim 1, wherein the first temperature adjustment unit (34) cools the supply air flow (3) after the supply air flow (3) has passed through the first heat exchanger (12) without cooling the exhaust air flow (2).

[0089] (Item 4) When the operation mode acquired by the operation mode acquisition unit is the heating mode, The first exhaust air passage switching unit (60) conveys the exhaust air flow (2) to the first bypass exhaust air passage (64). The heat exchange type ventilation device (1) according to claim 1, wherein the first temperature adjustment unit (34) heats the supply air flow (3) after the supply air flow (3) has passed through the first heat exchanger (12) without heating the exhaust air flow (2).

[0090] (Item 5) The heat exchange type ventilation device (1) further includes a second temperature adjustment unit (38) that belongs to the refrigeration cycle (30) and cools or heats the supply air flow (3) after passing through the first temperature adjustment unit (34) based on the operation mode acquired by the operation mode acquisition unit. When the operation mode acquired by the operation mode acquisition unit is the dehumidification mode or the heating mode, The second temperature adjustment unit (38) heats the supply air flow (3) after passing through the first temperature adjustment unit (34). When the operation mode acquired by the operation mode acquisition unit is the cooling mode, The heat exchange type ventilation device (1) according to claim 1, wherein the second temperature adjustment unit (38) cools the supply air flow (3) after passing through the first temperature adjustment unit (34).

[0091] (Item 6) A second heat exchanger (35) that performs heat exchange between the supply air flow (3) after passing through the first temperature adjustment unit (34) and before passing through the second temperature adjustment unit (38) and the exhaust air flow (2) before passing through the first temperature adjustment unit (34). An intake air flow temperature sensor (50) for detecting the temperature of the intake air flow (3) after passing through the first temperature adjustment unit (34) and before passing through the second heat exchanger (35); An exhaust air flow temperature sensor (52) for detecting the temperature of the exhaust air flow (2) before passing through the second heat exchanger (35), further comprising: The exhaust air duct (6) A heat exchange exhaust air duct (72) through which the exhaust air flow (2) passes through the second heat exchanger (35); A second bypass exhaust air duct (74) through which the exhaust air flow (2) bypasses the second heat exchanger (35); A second exhaust air duct switching unit (70) for switching between the heat exchange exhaust air duct (72) and the second bypass exhaust air duct (74) based on the operation mode acquired by the operation mode acquisition unit, the temperature of the intake air flow (3) detected by the intake air flow temperature sensor (50), and the temperature of the exhaust air flow (2) detected by the exhaust air flow temperature sensor (52). The heat exchange type ventilation device (1) according to claim 5.

[0092] (Item 7) The second exhaust air duct switching unit (70) When the operation mode acquired by the operation mode acquisition unit is the dehumidification mode, the exhaust air flow (2) is conveyed to the heat exchange exhaust air duct (72) regardless of the detection results of the intake air flow temperature sensor (50) and the exhaust air flow temperature sensor (52). The heat exchange type ventilation device (1) according to claim 6.

[0093] (Item 8) The second exhaust air duct switching unit (70) When the operation mode acquired by the operation mode acquisition unit is the cooling mode and the temperature of the intake air flow (3) acquired by the intake air flow temperature sensor (50) is equal to or higher than the temperature of the exhaust air flow (2) acquired by the exhaust air flow temperature sensor (52), the exhaust air flow (2) is conveyed to the heat exchange exhaust air duct (72), When the operation mode acquired by the operation mode acquisition unit is the cooling mode and the temperature of the supply air flow (3) acquired by the supply air flow temperature sensor (50) is lower than the temperature of the exhaust air flow (2) acquired by the exhaust air flow temperature sensor (52), the heat exchange type ventilation device (1) according to claim 6, which conveys the exhaust air flow (2) to the second bypass exhaust air passage (74).

[0094] (Item 9) The second exhaust air passage switching unit (70) When the operation mode acquired by the operation mode acquisition unit is the heating mode and the temperature of the supply air flow (3) acquired by the supply air flow temperature sensor (50) is lower than the temperature of the exhaust air flow (2) acquired by the exhaust air flow temperature sensor (52), the exhaust air flow (2) is conveyed to the heat exchange exhaust air passage (72), When the operation mode acquired by the operation mode acquisition unit is the heating mode and the temperature of the supply air flow (3) acquired by the supply air flow temperature sensor (50) is equal to or higher than the temperature of the exhaust air flow (2) acquired by the exhaust air flow temperature sensor (52), the heat exchange type ventilation device (1) according to claim 6, which conveys the exhaust air flow (2) to the second bypass exhaust air passage (74).

[0095] (Item 10) The heat exchange type ventilation device (1) according to claim 1, further comprising a circulation air passage (80) that merges the exhaust air flow (2) into the supply air flow (3) after passing through the first heat exchanger (12) and before passing through the first temperature adjustment unit (34) by communicating the exhaust air passage (6) and the supply air passage (7).

[0096] (Item 11) The heat exchange type ventilation device (1) according to claim 6, further comprising a circulation air passage (80) that merges the exhaust air flow (2) that has passed through the second heat exchanger (35) and before passing through the second temperature adjustment unit (38) into the supply air flow (3) that has passed through the second heat exchanger (35) and before passing through the first temperature adjustment unit (34) by communicating the exhaust air passage (6) and the supply air passage (7).

[0097] (Item 12) The air supply duct (7) is equipped with an air supply intake port (17) for sucking air from the outside, and an air supply outlet (18) for blowing air into the room. The exhaust duct (6) is equipped with an exhaust intake port (14) for sucking air from the room, and an exhaust outlet (15) for blowing air to the outside. The heat exchange type ventilation device (1) according to claim 1, further comprising a return air intake port (92) that sucks air from the room independently of the exhaust intake port (14), and a return air duct (90) that merges the air in the room sucked from the return air intake port (92) into the air supply flow (3) after passing through the first heat exchanger (12) and before passing through the first temperature adjustment unit (34).

[0098] As described above, the present disclosure has been described based on the embodiments. However, it can be easily inferred that the present disclosure is not limited to the above embodiments at all, and various improvements and modifications are possible without departing from the spirit of the present disclosure.

Explanation of Reference Numerals

[0099] 1 Heat exchange and ventilation device, 2 Exhaust air flow, 3 Supply air flow, 6 Exhaust air duct, 7 Supply air duct, 10 Indoor unit, 11 Main body case, 12 First heat exchanger, 14 Exhaust air inlet, 15 Exhaust air outlet, 17 Supply air inlet, 18 Supply air outlet, 20 Control device, 30 Refrigeration cycle, 31 Compressor, 32 Outdoor unit, 33 Expander, 33a First expander, 33b Second expander, 34 First temperature adjustment section, 34a First evaporator, 34b First condenser, 35 Second heat exchanger, 38 Second temperature adjustment section, 38a Second evaporator, 38b Second condenser, 39 Outdoor unit temperature adjustment section, 39a Outdoor evaporator, 39b Outdoor condenser, 41 Four-way valve, 50 Supply air flow temperature sensor, 52 Exhaust air flow temperature sensor, 60 First exhaust air duct switching section, 62 Temperature adjustment exhaust air duct, 64 First bypass exhaust air duct, 70 Second exhaust air duct switching section, 72 Heat exchange exhaust air duct, 74 Second bypass exhaust air duct, 80 Circulation air duct, 82 Branch position, 84 Confluence position, 90 Return air duct, 92 Return air inlet, 94 Confluence position.

Claims

1. A heat exchange ventilation device having a refrigeration cycle and capable of setting a plurality of operation modes, an operation mode acquisition unit that acquires the operation mode being set; a supply air duct that conveys a supply air flow flowing from the outside to the inside; an exhaust air duct that conveys an exhaust air flow flowing from the inside to the outside; a first heat exchanger that performs heat exchange between the supply air flow and the exhaust air flow; a first temperature adjustment unit that belongs to the refrigeration cycle and cools or heats the supply air flow after passing through the first heat exchanger and the exhaust air flow before passing through the first heat exchanger based on the operation mode acquired by the operation mode acquisition unit, and is provided with: The exhaust air duct is a temperature adjustment exhaust air duct through which the exhaust air flow passes through the first temperature adjustment unit; a first bypass exhaust air duct through which the exhaust air flow bypasses the first temperature adjustment unit; a first exhaust air duct switching unit that switches between the temperature adjustment exhaust air duct and the first bypass exhaust air duct based on the operation mode acquired by the operation mode acquisition unit; A heat exchange ventilation device comprising:

2. When the operation mode acquired by the operation mode acquisition unit is a dehumidification mode, the first exhaust air duct switching unit conveys the exhaust air flow to the temperature adjustment exhaust air duct, the first temperature adjustment unit cools the supply air flow after passing through the first heat exchanger and the exhaust air flow before passing through the first heat exchanger, and the heat exchange ventilation device according to claim 1.

3. When the operation mode acquired by the operation mode acquisition unit is a cooling mode, the first exhaust air duct switching unit conveys the exhaust air flow to the first bypass exhaust air duct, the first temperature adjustment unit cools the supply air flow after passing through the first heat exchanger without cooling the exhaust air flow, and the heat exchange ventilation device according to claim 1.

4. When the operation mode acquired by the operation mode acquisition unit is the heating mode, the first exhaust air passage switching unit conveys the exhaust air flow to the first bypass exhaust air passage, the first temperature adjustment unit heats the supply air flow after passing through the first heat exchanger without heating the exhaust air flow. The heat exchange type ventilation device according to claim 1.

5. further comprising a second temperature adjustment unit that belongs to the refrigeration cycle and cools or heats the supply air flow after passing through the first temperature adjustment unit based on the operation mode acquired by the operation mode acquisition unit, When the operation mode acquired by the operation mode acquisition unit is the dehumidification mode or the heating mode, the second temperature adjustment unit heats the supply air flow after passing through the first temperature adjustment unit, When the operation mode acquired by the operation mode acquisition unit is the cooling mode, the second temperature adjustment unit cools the supply air flow after passing through the first temperature adjustment unit. The heat exchange type ventilation device according to claim 1.

6. a second heat exchanger that exchanges heat between the supply air flow after passing through the first temperature adjustment unit and before passing through the second temperature adjustment unit and the exhaust air flow before passing through the first temperature adjustment unit, a supply air flow temperature sensor that detects the temperature of the supply air flow after passing through the first temperature adjustment unit and before passing through the second heat exchanger, an exhaust air flow temperature sensor that detects the temperature of the exhaust air flow before passing through the second heat exchanger, and further comprising, the exhaust air passage is a heat exchange exhaust air passage through which the exhaust air flow passes through the second heat exchanger, a second bypass exhaust air passage through which the exhaust air flow bypasses the second heat exchanger, A second exhaust air passage switching unit that switches the heat exchange exhaust air passage and the second bypass exhaust air passage based on the operation mode acquired by the operation mode acquisition unit, the temperature of the supply air flow detected by the supply air flow temperature sensor, and the temperature of the exhaust air flow detected by the exhaust air flow temperature sensor. The heat exchange type ventilation device according to claim 5, comprising:

7. The second exhaust air passage switching unit When the operation mode acquired by the operation mode acquisition unit is the dehumidification mode, regardless of the detection results of the supply air flow temperature sensor and the exhaust air flow temperature sensor, the exhaust air flow is conveyed to the heat exchange exhaust air passage. The heat exchange type ventilation device according to claim 6.

8. The second exhaust air passage switching unit When the operation mode acquired by the operation mode acquisition unit is the cooling mode and the temperature of the supply air flow acquired by the supply air flow temperature sensor is equal to or higher than the temperature of the exhaust air flow acquired by the exhaust air flow temperature sensor, the exhaust air flow is conveyed to the heat exchange exhaust air passage. When the operation mode acquired by the operation mode acquisition unit is the cooling mode and the temperature of the supply air flow acquired by the supply air flow temperature sensor is lower than the temperature of the exhaust air flow acquired by the exhaust air flow temperature sensor, the exhaust air flow is conveyed to the second bypass exhaust air passage. The heat exchange type ventilation device according to claim 6.

9. The second exhaust air passage switching unit When the operation mode acquired by the operation mode acquisition unit is the heating mode and the temperature of the supply air flow acquired by the supply air flow temperature sensor is lower than the temperature of the exhaust air flow acquired by the exhaust air flow temperature sensor, the exhaust air flow is conveyed to the heat exchange exhaust air passage. When the operation mode acquired by the operation mode acquisition unit is the heating mode and the temperature of the supply air flow acquired by the supply air flow temperature sensor is equal to or higher than the temperature of the exhaust air flow acquired by the exhaust air flow temperature sensor, the exhaust air flow is conveyed to the second bypass exhaust air passage. The heat exchange type ventilation device according to claim 6.

10. The heat exchange type ventilation device according to claim 1, further comprising a circulation air passage that communicates the exhaust air passage and the supply air passage to merge the exhaust air flow into the supply air flow after passing through the first heat exchanger and before passing through the first temperature adjustment unit.

11. The heat exchange type ventilation device according to claim 6, further comprising a circulation air passage that communicates the exhaust air passage and the supply air passage to merge the exhaust air flow that has passed through the second heat exchanger and before passing through the first temperature adjustment unit into the supply air flow that has passed through the second heat exchanger and before passing through the second temperature adjustment unit.

12. The supply air passage includes a supply air suction port that sucks air from the outside, and a supply air outlet that blows air into the room. The exhaust air passage includes an exhaust air suction port that sucks air from the room, and an exhaust air outlet that blows air to the outside. The heat exchange type ventilation device according to claim 1 has a return air suction port that sucks air from the room independently of the exhaust air suction port, and further includes a return air passage that merges the air in the room sucked from the return air suction port into the supply air flow after passing through the first heat exchanger and before passing through the first temperature adjustment unit.

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