Heat exchange type ventilation device

Abstract

To provide technique for improving efficiency of dehumidification in a heat exchange type ventilation device.SOLUTION: A supply air passage 7 conveys a supply air current 3 flowing from the outdoor side to the indoor side. An exhaust air passage 6 conveys an exhaust air current 2 flowing from the indoor side to the outdoor side. A first heat exchanger 12 performs heat exchange between the supply air current 3 and the exhaust air current 2. A first evaporator 34a cools the supply air current 3 after passing through the first heat exchanger 12 and the exhaust air current 2 before passing through the first heat exchanger 12. A second condenser 38b heats the supply air current 3 after passing through the first evaporator 34a.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 the heat exchange ventilation device is operated for dehumidification, it is required to improve the dehumidification efficiency.

[0005] Therefore, the present disclosure solves the above problems and aims to provide a technique for improving the dehumidification efficiency 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, including 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 dehumidification efficiency in a heat exchange ventilation apparatus can be improved.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The embodiments described below all show 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 examples and 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 highest 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] FIG. 1 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 adjustment 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 increase the temperature of the refrigerant. The compressor 31 circulates the refrigeration cycle 30, that is, the refrigerant, by pressurizing the refrigerant.

[0013] 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 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 to lower 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, 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, it introduces the expanded refrigerant and is heated by discharging cold air to the outside (the outside air). On the other hand, when the outdoor unit temperature adjustment unit 39 functions as the outdoor condenser 39b, it introduces the condensed refrigerant and is cooled by discharging heat to the outside.

[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 outlet 15, an exhaust air passage 6, an intake air suction port 17, an intake air outlet 18, an intake air passage 7, a first heat exchanger 12, a second heat exchanger 35, a first temperature control unit 34, and a second temperature control unit 38. Further, the indoor unit 10 also includes an exhaust fan and an intake air 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 outlet 15 is an outlet that blows the exhaust flow 2 (air) from the indoor unit 10 outdoors. The exhaust outlet 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 outlet 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 outlet 15. The exhaust fan is composed of, for example, a sirocco fan.

[0018] The intake air suction port 17 is a suction port that sucks the intake air flow 3 (air) from outdoors into the indoor unit 10. The intake air suction port 17 is provided, for example, in a circular shape and a duct is connected thereto. The intake air outlet 18 is an outlet that blows the intake air flow 3 (air) from the indoor unit 10 into each living room indoors. The intake air outlet 18 is provided, for example, in a circular shape and a duct is connected thereto. The intake air passage 7 is an air passage that communicates the intake air suction port 17 and the intake air outlet 18. Therefore, the intake air passage 7 conveys the intake air flow 3 flowing from outdoors to indoors. The intake air fan (not shown) is a blower that guides the intake air flow 3 sucked from the intake air suction port 17 to the intake air outlet 18. The intake air 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 intake air 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 and 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 into 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] In the present embodiment, among the plurality of operation modes in the heat exchange type ventilation device 1, only the dehumidification operation mode 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. 2. FIG. 2 shows an overview 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 inlet 17 to the supply air outlet 18 via the first heat exchanger 12, the first evaporator 34a, the second heat exchanger 35, and the second condenser 38b. Also, the exhaust air duct 6 is connected from the exhaust air inlet 14 to the exhaust air outlet 15 via the second heat exchanger 35, the first evaporator 34a, and the first heat exchanger 12.

[0029] 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 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 part and discharged outdoors.

[0030] 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 excessive temperature drop due to dehumidification.

[0031] The exhaust gas flow 2 sucked in from the exhaust gas suction port 14 is cooled (pre-cooled) by heat exchange with the supply air flow 3 in the second heat exchanger 35. The exhaust gas flow 2 from the second heat exchanger 35 is cooled by the first evaporator 34a. The exhaust gas flow 2 from the first evaporator 34a performs heat exchange with the supply air flow 3 in the first heat exchanger 12. Thereby, the exhaust gas flow 2 is heated.

[0032] Before the exhaust gas 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 gas flow 2 and the supply air flow 3 in the first heat exchanger 12 increases, so the heat exchange amount increases. Thereby, the temperature of the supply air flow 3 flowing into the first evaporator 34a becomes lower, so the dehumidification efficiency is improved.

[0033] (Modification Example 1) A modification example 1 of this embodiment will be described. Modification example 1 is an example with a simpler configuration than that in FIG. 2. FIG. 3 shows an outline of the operation in the dehumidification operation mode. Compared with FIG. 2, 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. The supply air duct 7 is connected from the supply air suction port 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 duct 6 is connected from the exhaust air suction port 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. 2, so the description is omitted here.

[0034] (Modification Example 2) Describe Modification Example 2 of this embodiment. In Modification Example 2, the temperature-adjusted exhaust air duct 54 and the bypass exhaust air duct 56 are included in the exhaust air duct 6. FIG. 4 shows an overview of the operation in the dehumidification operation mode. Similar to FIG. 2, 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 inlet 17 to the supply air outlet 18 via the first heat exchanger 12, the first evaporator 34a, the second heat exchanger 35, and the second condenser 38b. Here, an air supply flow humidity sensor 50 is provided between the air supply inlet 17 and the first heat exchanger 12. The air supply flow humidity sensor 50 detects the humidity of the air supply flow 3 sucked from the outside. The air supply flow humidity sensor 50 has a communication function and transmits the detected humidity to a control device 20 (not shown).

[0035] Also, the exhaust air duct 6 is connected from the exhaust air inlet 14 to the exhaust air outlet 15 via the second heat exchanger 35, the first evaporator 34a, and the first heat exchanger 12. Here, a flow rate adjustment unit 52 is provided in the subsequent stage of the second heat exchanger 35 in the exhaust air duct 6, and the exhaust air duct 6 branches from the flow rate adjustment unit 52 into the temperature-adjusted exhaust air duct 54 and the bypass exhaust air duct 56. The temperature-adjusted exhaust air duct 54 is arranged to pass through the first evaporator 34a in the same manner as the previous exhaust air duct 6. Therefore, the exhaust flow 2 flowing through the temperature-adjusted exhaust air duct 54 passes through the first evaporator 34a. On the other hand, the bypass exhaust air duct 56 is arranged to bypass the first evaporator 34a. Therefore, the exhaust flow 2 flowing through the bypass exhaust air duct 56 bypasses the first evaporator 34a. After the temperature-adjusted exhaust air duct 54 passes through the first evaporator 34a and before passing through the first heat exchanger 12, the temperature-adjusted exhaust air duct 54 and the bypass exhaust air duct 56 merge.

[0036] The control device 20 controls the flow rate adjustment unit 52 based on the humidity of the air supply flow 3 received from the air supply flow humidity sensor 50. For example, when the humidity of the air supply flow 3 is equal to or higher than the threshold value, the control device 20 selects the temperature-adjusted exhaust air duct 54, and when the humidity of the air supply flow 3 is less than the threshold value, the control device 20 selects the bypass exhaust air duct 56. The control device 20 transmits the selection result to the flow rate adjustment unit 52.

[0037] The flow rate adjustment unit 52 selects the temperature adjustment exhaust air passage 54 or the bypass exhaust air passage 56 based on the selection result received from the control device 20. That is, when the humidity of the supply air flow 3 is equal to or higher than the threshold value, the flow rate adjustment unit 52 opens the temperature adjustment exhaust air passage 54 and closes the bypass exhaust air passage 56. As a result, the exhaust air flow 2 is cooled by the first evaporator 34a as it flows through the temperature adjustment exhaust air passage 54. On the other hand, when the humidity of the supply air flow 3 is less than the threshold value, the flow rate adjustment unit 52 closes the temperature adjustment exhaust air passage 54 and opens the bypass exhaust air passage 56. As a result, the exhaust air flow 2 is not cooled by the first evaporator 34a as it flows through the bypass exhaust air passage 56.

[0038] The control device 20 may determine the opening degree of the temperature adjustment exhaust air passage 54 and the opening degree of the bypass exhaust air passage 56, for example, in a ratio of 6:4 according to the humidity of the supply air flow 3. The flow rate adjustment unit 52 may adjust the opening degree of the temperature adjustment exhaust air passage 54 and the opening degree of the bypass exhaust air passage 56 based on the opening degree information received from the control device 20.

[0039] Summarizing these, when the humidity of the supply air flow 3 is equal to or higher than the threshold value, the flow rate adjustment unit 52 makes the flow rate of the exhaust air flow 2 conveyed through the temperature adjustment exhaust air passage 54 larger than the flow rate of the exhaust air flow 2 conveyed through the bypass exhaust air passage 56. On the other hand, when the humidity of the supply air flow 3 is less than the threshold value, the flow rate adjustment unit 52 makes the flow rate of the exhaust air flow 2 conveyed through the bypass exhaust air passage 56 larger than the flow rate of the exhaust air flow 2 conveyed through the temperature adjustment exhaust air passage 54. That is, the flow rate adjustment unit 52 adjusts the flow rate of the exhaust air flow 2 conveyed through the temperature adjustment exhaust air passage 54 and the flow rate of the exhaust air flow 2 conveyed through the bypass exhaust air passage 56.

[0040] (Modification Example 3) A third modification of this embodiment will be described. In the third modification, a circulation air passage 60 is provided that branches from the exhaust air passage 6 and is connected to the supply air passage 7. FIGS. 5(a)-(d) show an outline of the operation in the dehumidifying operation mode. In FIG. 5(a), similar to the first modification, 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.

[0041] A branch position 62 is provided at the exhaust air inlet 14 of the exhaust air passage 6. At the branch position 62, the circulation air passage 60 branches from the exhaust air passage 6, and the circulation air passage 60 is connected to the supply air passage 7 at the confluence position 64. The confluence position 64 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 60 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.

[0042] FIG. 5(b) is different from FIG. 5(a) in the position of the branch position 62. In the exhaust air passage 6, the branch position 62 is provided in a portion after passing through the first evaporator 34a and before passing through the first heat exchanger 12.

[0043] In Fig. 5(c), similar to the embodiment, the first heat exchanger 12, the first evaporator 34a, the second heat exchanger 35, and the second condenser 38b are arranged in order. The air supply duct 7 is connected from the air supply inlet 17 to the air supply outlet 18 via the first heat exchanger 12, the first evaporator 34a, the second heat exchanger 35, and the second condenser 38b. Also, the exhaust duct 6 is connected from the exhaust inlet 14 to the exhaust outlet 15 via the second heat exchanger 35, the first evaporator 34a, and the first heat exchanger 12. In the exhaust duct 6, a branch position 62 is provided in the portion before passing through the second heat exchanger 35. At the branch position 62, a circulation duct 60 branches from the exhaust duct 6, and the circulation duct 60 is connected to the air supply duct 7 at the confluence position 64. The confluence position 64 is a position in the air supply duct 7 after passing through the first heat exchanger 12 and before passing through the first evaporator 34a.

[0044] Fig. 5(d) is different from Fig. 5(c) in the position of the branch position 62. In the exhaust duct 6, a branch position 62 is provided in the portion after passing through the first evaporator 34a and before passing through the first heat exchanger 12.

[0045] (Modification Example 4) Modification Example 4 of this embodiment will be described. In Modification Example 4, a circulation duct 60 that branches from the exhaust duct 6 and is connected to the air supply duct 7 is provided. Fig. 6 shows an outline of the operation in the dehumidification operation mode. In Fig. 6, similar to the embodiment, the first heat exchanger 12, the first evaporator 34a, the second heat exchanger 35, and the second condenser 38b are arranged in order. The air supply duct 7 is connected from the air supply inlet 17 to the air supply outlet 18 via the first heat exchanger 12, the first evaporator 34a, the second heat exchanger 35, and the second condenser 38b. Also, the exhaust duct 6 is connected from the exhaust inlet 14 to the exhaust outlet 15 via the second heat exchanger 35, the first evaporator 34a, and the first heat exchanger 12.

[0046] In the exhaust air duct 6, a branch position 62 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 62, a circulation air duct 60 branches off from the exhaust air duct 6, and the circulation air duct 60 is connected to the supply air duct 7 at a confluence position 64. The confluence position 64 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 60 merges the exhaust air flow 2 after passing through the second heat exchanger 35 and before passing through the second condenser 38b into the supply air flow 3 after passing through the second heat exchanger 35 and before passing through the second condenser 38b. Since the supply air flow 3 is blown out from the heat exchange type ventilation device 1, the exhaust air flow 2 is dehumidified to a certain extent. Therefore, by merging a part of the exhaust air flow 2 into the supply air flow 3 and then passing it through the second condenser 38b, a part of the exhaust air flow 2 is reused as the supply air flow 3.

[0047] (Modification Example 5) A modification example 5 of the present embodiment will be described. In modification example 5, a return air duct 70 is provided which is separate from the exhaust air duct 6 and connected to the supply air duct 7. FIG. 7 is a diagram showing an outline of the operation in the dehumidification operation mode. In FIG. 7, similar to the embodiment, 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 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 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 second heat exchanger 35, the first evaporator 34a, and the first heat exchanger 12.

[0048] In addition, a return air suction port 72 for sucking air from indoors independently of the exhaust air suction port 14 is provided, and a return air duct 70 extends from the return air suction port 72. The return air duct 70 is connected to the supply air duct 7 at a confluence position 74. The confluence position 74 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 70 merges the indoor air sucked from the return air suction port 72 into the supply air flow 3 after passing through the first heat exchanger 12 and before passing through the first evaporator 34a.

[0049] The subject of the device, system, or method in this disclosure includes a computer. By executing a program on this computer, the functions of the subject of the device, system, or method in this disclosure are realized. The computer mainly includes a processor that operates according to the program as its 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.

[0050] According to this embodiment, since the exhaust gas 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 gas flow 2 in the first heat exchanger 12, the temperature difference between the supply air flow 3 and the exhaust gas flow 2 in the first heat exchanger 12 can be increased. Also, since the temperature difference between the supply air flow 3 and the exhaust gas flow 2 in the first heat exchanger 12 becomes larger, the heat exchange amount in the first heat exchanger 12 can be increased. Further, since the heat exchange amount becomes larger, the dehumidification efficiency in the heat exchange ventilation device 1 can be improved. Since heat exchange is also performed between the supply air flow 3 and the exhaust gas flow 2 in the second heat exchanger 35, the temperature difference between the supply air flow 3 and the exhaust gas 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 gas flow 2 in the first heat exchanger 12 becomes further larger, the heat exchange amount in the first heat exchanger 12 can be further increased. Further, since the heat exchange amount becomes further larger, the dehumidification efficiency in the heat exchange ventilation device 1 can be further improved.

[0051] Also, when the humidity of the supply air flow 3 is equal to or higher than the threshold value, the flow rate of the exhaust air flow 2 conveyed in the temperature-adjusted exhaust air passage 54 is made larger than the flow rate of the exhaust air flow 2 conveyed in the bypass exhaust air passage 56, so that the supply air flow 3 can be dehumidified. Further, when the humidity of the supply air flow 3 is less than the threshold value, the flow rate of the exhaust air flow 2 conveyed in the bypass exhaust air passage 56 is made larger than the flow rate of the exhaust air flow 2 conveyed in the temperature-adjusted exhaust air passage 54, so that the frequency of use of the first evaporator 34a can be suppressed.

[0052] Also, the exhaust air flow 2 is merged into the supply air flow 3 after passing through the first heat exchanger 12 and before passing through the first evaporator 34a, so that the exhaust air flow 2 can be reused. Further, the exhaust air flow 2 after passing through the second heat exchanger 35 and before passing through the second condenser 38b is merged into the supply air flow 3 after passing through the second heat exchanger 35 and before passing through the first evaporator 34a, so that the exhaust air flow 2 can be reused. Also, the indoor air sucked from the return air suction port 72 is merged into the supply air flow 3 after passing through the first heat exchanger 12 and before passing through the first evaporator 34a, so that the indoor air can be reused.

[0053] The outline of one aspect of the present disclosure is as follows. (Item 1) A heat exchange type ventilation device (1) having a refrigeration cycle (30), A supply air passage (7) for conveying a supply air flow (3) flowing from the outside to the inside of the house, An exhaust air passage (6) for conveying the exhaust air flow (2) flowing from the inside of the house to the outside, A first heat exchanger (12) that performs heat exchange between the supply air flow (3) and the exhaust air flow (2), An evaporator (34a) belonging to the refrigeration cycle (30) that 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), A condenser (38b) belonging to the refrigeration cycle (30) that heats the supply air flow (3) after passing through the evaporator (34a), The heat exchange type ventilation device (1) comprising the above.

[0054] (Item 2) The heat exchange type ventilation device (1) according to item 1, further comprising a second heat exchanger (35) that performs heat exchange between the supply air flow (3) after passing through the evaporator (34a) and before passing through the condenser (38b) and the exhaust air flow (2) before passing through the evaporator (34a).

[0055] (Item 3) Further comprising a supply air flow humidity sensor (50) for detecting the humidity of the supply air flow (3) sucked in from the outside, The exhaust air duct (6) is, A temperature adjustment exhaust air duct (54) through which the exhaust air flow (2) passes through the evaporator (34a), A bypass exhaust air duct (56) through which the exhaust air flow (2) bypasses the evaporator (34a), And a flow rate adjustment unit (52) for adjusting the flow rate of the exhaust air flow (2) conveyed in the temperature adjustment exhaust air duct (54) and the flow rate of the exhaust air flow (2) conveyed in the bypass exhaust air duct (56), The flow rate adjustment unit (52) is, When the humidity of the supply air flow (3) acquired by the supply air flow humidity sensor (50) is equal to or greater than a threshold value, the flow rate of the exhaust air flow (2) conveyed in the temperature adjustment exhaust air duct (54) is made larger than the flow rate of the exhaust air flow (2) conveyed in the bypass exhaust air duct (56), When the humidity of the supply air flow (3) acquired by the supply air flow humidity sensor (50) is less than the threshold value, the flow rate of the exhaust air flow (2) conveyed in the bypass exhaust air duct (56) is made larger than the flow rate of the exhaust air flow (2) conveyed in the temperature adjustment exhaust air duct (54). The heat exchange type ventilation device (1) according to item 1.

[0056] (Item 4) The heat exchange type ventilation device (1) according to item 1, further comprising a circulation air duct (60) 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 evaporator (34a) by communicating the exhaust air duct (6) and the supply air duct (7).

[0057] (Item 5) The heat exchange type ventilation device (1) according to item 2, further comprising a circulation air passage (60) that communicates the exhaust air passage (6) and the supply air passage (7) to merge the exhaust air flow (2) after passing through the second heat exchanger (35) and before passing through the condenser (38b) into the supply air flow (3) after passing through the second heat exchanger (35) and before passing through the evaporator (34a).

[0058] (Item 6) The supply air passage (7) includes a supply air inlet (17) for sucking air from the outside, and a supply air outlet (18) for blowing air into the room. The exhaust air passage (6) includes an exhaust air inlet (14) for sucking air from the room, and an exhaust air outlet (15) for blowing air to the outside. The heat exchange type ventilation device (1) according to item 1, further having a return air inlet (72) that sucks air from the room independently of the exhaust air inlet (14), and further comprising a return air passage (70) that merges the air in the room sucked from the return air inlet (72) into the supply air flow (3) after passing through the first heat exchanger (12) and before passing through the evaporator (34a).

[0059] 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

[0060] 1 Heat exchange 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 humidity sensor, 52 Flow adjustment section, 54 Temperature-adjusted exhaust air duct, 56 Bypass exhaust air duct, 60 Circulation air duct, 62 Branch position, 64 Confluence position, 70 Return air duct, 72 Return air inlet, 74 Confluence position.

Claims

1. A heat exchange type ventilation device having a refrigeration cycle, An air supply duct for conveying an air supply flow flowing from the outside to the inside, An exhaust duct for conveying an exhaust flow flowing from the inside to the outside, A first heat exchanger that performs heat exchange between the air supply flow and the exhaust flow, An evaporator that belongs to the refrigeration cycle and cools the air supply flow after passing through the first heat exchanger and the exhaust flow before passing through the first heat exchanger, A condenser that belongs to the refrigeration cycle and heats the air supply flow after passing through the evaporator, A heat exchange type ventilation device comprising the same.

2. The heat exchange type ventilation device according to claim 1, further comprising a second heat exchanger that performs heat exchange between the air supply flow after passing through the evaporator and before passing through the condenser and the exhaust flow before passing through the evaporator.

3. Further comprising an air supply flow humidity sensor for detecting the humidity of the air supply flow sucked in from the outside, The exhaust duct is A temperature adjustment exhaust duct through which the exhaust flow passes through the evaporator, A bypass exhaust duct through which the exhaust flow bypasses the evaporator, And a flow rate adjustment unit for adjusting the flow rate of the exhaust flow conveyed in the temperature adjustment exhaust duct and the flow rate of the exhaust flow conveyed in the bypass exhaust duct, The flow rate adjustment unit is When the humidity of the air supply flow acquired by the air supply flow humidity sensor is equal to or higher than a threshold value, the flow rate of the exhaust flow conveyed in the temperature adjustment exhaust duct is made larger than the flow rate of the exhaust flow conveyed in the bypass exhaust duct, When the humidity of the air supply flow acquired by the air supply flow humidity sensor is less than the threshold value, the flow rate of the exhaust flow conveyed in the bypass exhaust duct is made larger than the flow rate of the exhaust flow conveyed in the temperature adjustment exhaust duct. The heat exchange type ventilation device according to claim 1.

4. 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 evaporator.

5. The heat exchange type ventilation device according to claim 2, 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 condenser into the supply air flow that has passed through the second heat exchanger and before passing through the evaporator.

6. The supply air passage comprises a supply air inlet for sucking air from the outside, and a supply air outlet for blowing air into the room. The exhaust air passage comprises an exhaust air inlet for sucking air from the room, and an exhaust air outlet for blowing air to the outside. The heat exchange type ventilation device according to claim 1, having a return air inlet that sucks air from the room independently of the exhaust air inlet, and further comprising a return air passage that merges the air in the room sucked from the return air inlet into the supply air flow after passing through the first heat exchanger and before passing through the evaporator.

Images