Heat exchange type ventilation device

Abstract

To provide a heat exchange type ventilation device capable of reducing a load of a compressor and performing operation while saving energy.SOLUTION: A heat exchange type ventilation device includes a refrigeration cycle. The heat exchange type ventilation device includes: an air supply air course for conveying a supply air flow flowing from an outdoor side to an indoor side; an air exhaust air course for conveying an exhaust air flow flowing from the indoor side to the outdoor side; a heat exchanger for exchanging heat between the supply air flow and the exhaust air flow; a heat absorber belonging to the refrigeration cycle to cool the supply air flow after passing through the heat exchanger; an evaporation part for evaporating moisture generated in the heat absorber in the air supply air course through cooling in the air exhaust air course; a water guide part that communicates the air supply air course with the air exhaust air course to guide moisture generated in the heat absorber in the air supply air course to the evaporation part of the air exhaust air course; a first heat radiator belonging to the refrigeration cycle to heat the exhaust air flow after passing through the heat exchanger and before passing through the evaporation part; and a second radiator belonging to the refrigeration cycle to heat the exhaust air flow after passing through the evaporation part.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] For example, Patent Document 1 is disclosed as an outdoor air treatment device. A conventional configuration will be described with reference to FIG. 5. As shown in FIG. 5, the outdoor air treatment device 101 is provided with a heat exchange unit 102, a heat pump unit 103, and a sensible heat exchange unit 104. Further, inside the outdoor air treatment device 101, an air supply passage 105 that dehumidifies the outdoor air OA and supplies it as supply air SA to the air-conditioned space, and an exhaust passage 106 that exhausts the return air RA discharged from the air-conditioned space to the outside as exhaust air EA are formed. A heat exchange unit 102 is interposed between the air supply passage 105 and the exhaust passage 106, and heat exchange is performed between the outdoor air OA taken in through the air supply passage 105 and the return air RA discharged through the exhaust passage 106 (see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in Patent Document 1, an evaporation unit 107 is provided in the exhaust passage 106, and the drain water generated in the heat pump unit 103 is evaporated into the exhaust by applying the exhaust EA to the vaporization member 108. Here, a second heat exchanger 109 is disposed upstream of the vaporization member 108. In such a configuration, in order to simultaneously perform the exhaust heat of the heat pump unit 103 and the heating of the vaporization member 108, it is necessary to raise the temperature of the second heat exchanger 109, and it is conceivable that the load on the compressor 110 increases and the power consumption increases.

[0005] Therefore, the present invention aims to solve the above problems and provides a heat exchange type ventilation device capable of reducing the load on the compressor and operating in an energy-saving manner.

Means for Solving the Problems

[0006] To achieve this object, the heat exchange type ventilation device of the present invention is a heat exchange type ventilation device having a refrigeration cycle, and includes 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 heat exchanger for performing heat exchange between the air supply flow and the exhaust flow, a heat absorber belonging to the refrigeration cycle for cooling the air supply flow after passing through the heat exchanger, an evaporation section for evaporating moisture generated in the heat absorber of the air supply duct by cooling in the exhaust duct, a water guide section for guiding the moisture generated in the heat absorber of the air supply duct to the evaporation section of the exhaust duct by communicating the air supply duct and the exhaust duct, a first radiator belonging to the refrigeration cycle for heating the exhaust flow after passing through the heat exchanger and before passing through the evaporation section, and a second radiator belonging to the refrigeration cycle for heating the exhaust flow after passing through the evaporation section.

Effects of the Invention

[0007] According to the present invention, it is possible to provide a heat exchange type ventilation device capable of reducing the load on the compressor and operating in an energy-saving manner.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0009] Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings. Note that all of the embodiments described below show preferred specific examples of the present invention. Therefore, numerical values, shapes, materials, components, the arrangement positions and connection forms of the components, etc. shown in the following embodiments are merely examples and are not intended to limit the present invention. Therefore, among the components in the following embodiments, the components not described in the independent claims indicating the highest concept of the present invention are described as optional components. Also, in each figure, substantially the same configurations are denoted by the same reference numerals, and overlapping descriptions are omitted or simplified. (Embodiment) First, the configuration of the outside air treatment module according to an embodiment of the present invention will be described with reference to FIG. 1. FIG. 1 is a schematic diagram of a heat exchange type ventilation device 1 equipped with a refrigeration cycle 3 according to the present invention.

[0010] The heat exchange type ventilation device 1 is, for example, a device installed in a building that ventilates while performing heat exchange between outside air, which is outdoor air, and inside air, which is indoor air. In other words, it ventilates while performing heat exchange between the supply air flow 19 sucked in from the outside and the exhaust air flow 20 sucked in from the inside. The heat exchange type ventilation device 1 includes an inside air port 4, an outside air port 5, a supply air port 6, an exhaust air port 7, a supply air duct 8, an exhaust air duct 9, a total heat exchange element 2, a refrigeration cycle 3, an evaporation section 11, a water receiving section 10, and a water guiding section 12.

[0011] The inside air port 4 is an opening provided in the housing of the heat exchange type ventilation device 1 and is a suction port for sucking indoor air as the exhaust air flow 20 into the inside of the heat exchange type ventilation device 1.

[0012] The outside air port 5 is an opening provided in the housing of the heat exchange type ventilation device 1 and is a suction port for sucking outdoor air as the supply air flow 19 into the inside of the heat exchange type ventilation device 1.

[0013] The supply air port 6 is an opening provided in the housing of the heat exchange type ventilation device 1 and is a blowout port for blowing out the supply air flow 19 from the heat exchange type ventilation device 1 into the room.

[0014] The exhaust port 7 is an opening provided in the housing of the heat exchange type ventilation device 1, and is an outlet for blowing the exhaust flow 20 from the heat exchange type ventilation device 1 to the outside of the room.

[0015] The supply air duct 8 is a duct that communicates the outside air port 5 and the supply air port 6, and through which the supply air flow 19 flows.

[0016] The exhaust air duct 9 is a duct that communicates the indoor air port 4 and the exhaust port 7, and through which the exhaust flow 20 flows.

[0017] The total heat exchange element 2 is a member for performing heat exchange between the supply air flow 19 and the exhaust air flow 20. For example, in summer, by performing heat exchange between the supply air flow 19 with a high temperature and the exhaust air flow 20 with a low temperature, an increase in the indoor temperature can be suppressed. Also, in winter, by performing heat exchange between the supply air flow 19 with a low temperature and the exhaust air flow 20 with a high temperature, a decrease in the indoor temperature can be suppressed.

[0018] In the refrigeration cycle 3, the refrigerant circulates in the order of the compressor 16, the second radiator 15, the first radiator 14, the expander 17, and the absorber 13, and adjusts the temperature of the supply air flow 19 after heat exchange with the exhaust air flow 20 in the total heat exchange element 2. In other words, the refrigeration cycle 3 adjusts the temperature of the outside air flowing from the outside of the room to the inside of the room. In the present embodiment, an example of cooling and dehumidifying the supply air flow 19 will be described. This case will be described as an example.

[0019] In the refrigeration cycle 3, the compressor 16 serves as power to circulate the refrigerant. In the refrigeration cycle 3, for example, alternative refrigerants (such as HFC134a and R410A) are used as the refrigerant. Also, the refrigeration cycle 3 may be provided with a four-way valve. By controlling the direction in which the refrigerant circulates with the four-way valve, the absorber 13 can be made to act as a radiator, and the first radiator 14 and the second radiator 15 can be made to act as absorbers. In other words, the refrigeration cycle 3 enables the heat exchange type ventilation device 1 to realize a plurality of operation modes such as cooling, heating, and dehumidification. The refrigeration cycle 3 includes the compressor 16, the first radiator 14, the second radiator 15, the expander 17, and the absorber 13.

[0020] The compressor 16 is a device that compresses the refrigerant at low temperature and low pressure in the refrigeration cycle 3, increases the pressure, and raises the temperature. By compressing the refrigerant with the compressor 16, the refrigerant circulates through the refrigeration cycle 3. In the present embodiment, the compressor 16 sets the temperature of the refrigerant to about 45°C.

[0021] The first radiator 14 and the second radiator 15 are devices that release the heat of the refrigerant that has become high temperature and high pressure by the compressor 16 to the outside. The first radiator 14 is disposed on the downstream side of the total heat exchange element 2 in the exhaust air duct 9, and the second radiator 15 is disposed on the further downstream side of the first radiator 14 with the evaporation section 11 described later interposed therebetween. In other words, the exhaust flow 20 is arranged to pass through the total heat exchange element 2, the first radiator 14, the evaporation section 11, and the second radiator 15 in this order. With such an arrangement, the first radiator 14 heats the exhaust flow 20 after passing through the total heat exchange element 2, and the second radiator 15 heats the exhaust flow 20 after passing through the evaporation section 11.

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

[0023] The heat absorber 13 cools the supply air flow 19 in the supply air duct 8 with the refrigerant that has become low temperature and low pressure by the expander 17. As a result, the temperature of the supply air flow 19 becomes equal to or lower than the dew point temperature, the supply air flow 19 condenses, and the moisture in the supply air flow 19 is removed. That is, by cooling the supply air flow 19 with the heat absorber 13, dehumidification of the supply air flow 19 is performed. The heat absorber 13 is disposed on the downstream side of the total heat exchange element 2 in the supply air duct 8 and cools the supply air flow 19 after heat exchange with the exhaust flow 20. In other words, the heat absorber 13 exchanges heat with the outside air flowing from the outside to the inside of the room. In the heat absorber 13, the temperature of the refrigerant is lower than the temperature of the supply air flow 19. Therefore, when heat exchange occurs between the supply air flow 19 and the heat absorber 13, the temperature of the supply air flow 19 decreases and the temperature of the refrigerant increases.

[0024] Here, as shown in FIG. 1, with the heat exchange type ventilation device 1 installed, the heat absorber 13 is located above the first radiator 14 and the second radiator 15. Since the heat absorber 13 is arranged in the supply air duct 8 and the first radiator 14 and the second radiator 15 are arranged in the exhaust air duct 9, in other words, the supply air duct 8 is located above the exhaust air duct 9. With such an arrangement, the moisture generated on the supply air duct 8 side can be guided to the exhaust air duct 9 side by gravity.

[0025] The evaporation part 11 is a member for evaporating the moisture generated by the heat absorber 13 in the supply air duct 8 in the exhaust air duct 9. The evaporation part 11 is provided between the first radiator 14 and the second radiator 15 in the exhaust air duct 9.

[0026] Here, with reference to FIG. 2, the changes in the temperature and humidity of the exhaust flow 20 will be described. FIG. 2 is a diagram comparing the conventional method and the method of the present application, and is a diagram showing the transition of the temperature and humidity of the exhaust flow when the same amount of moisture evaporates. Here, FIG. 2(a) is a diagram showing the conventional method, and FIG. 2(b) is a diagram showing the method of the present application.

[0027] Conventionally, as shown in FIG. 5, the exhaust flow that has passed through the heat exchange unit 102 is heated by the second heat exchanger 109, and the temperature rises as shown by the transition from point A to point B in FIG. 2(a). Next, the vaporization member 108 absorbs heat from the exhaust flow, and as the moisture evaporates from the vaporization member 108, the temperature of the exhaust flow drops and the humidity rises as shown by the transition from point B to point C. In the conventional arrangement, in order to simultaneously perform the exhaust heat of the heat pump unit 103 and the heating of the vaporization member 108, it is necessary to raise the temperature of the second heat exchanger 109, and the load on the compressor 110 has increased.

[0028] In the configuration of the present application, the exhaust air flow 20 that has passed through the total heat exchange element 2 as shown in FIG. 1 is first heated by the first radiator 14, and the temperature rises as shown by the transition from point D to point E in FIG. 2(b). Next, the evaporation section 11 absorbs heat from the exhaust air flow 20, and moisture evaporates from the evaporation section 11, causing the temperature of the exhaust air flow 20 to drop and the humidity to rise as shown by the transition from point E to point F. In the configuration of the present application, the exhaust air flow 20 that has absorbed heat in the evaporation section 11 is further heated by the second radiator 15, and the temperature rises as shown by the transition from point F to point G. In other words, the first radiator 14 heats the exhaust air flow 20 upstream of the evaporation section 11, thereby providing the exhaust air flow 20 with energy for heating the evaporation section 11. In addition, the second radiator 15 heats the exhaust air flow 20 downstream of the evaporation section 11, thereby providing the exhaust air flow 20 with energy for the refrigeration cycle 3 to exhaust heat. Here, the exhaust flow at point C in Fig. 2(a) and the exhaust flow 20 at point G in Fig. 2(b) have the same temperature and humidity. With this configuration, the heating of the evaporation section 11 and the exhaust heat of the refrigeration cycle 3 are shared between the first radiator 14 and the second radiator 15, so that the load on the compressor 16 can be reduced compared to the conventional case where heating is performed by one second heat exchanger 109.

[0029] 1, it is preferable that the evaporation section 11 is located vertically below the heat absorber 13. With such an arrangement, moisture generated in the heat absorber 13 drips directly onto the evaporation section 11 due to gravity, making it easier for the evaporation section 11 to absorb the moisture.

[0030] 3, the evaporation section 11 is configured to be porous with a plurality of gaps 32 between a plurality of fibers 31. This configuration allows the evaporation section 11 to easily absorb moisture into the gaps 32. Note that, in order to facilitate the passage of the exhaust flow 20 through the evaporation section 11, it is preferable that the gaps 32 be disposed opposite the traveling direction of the exhaust flow 20.

[0031] The water receiving part 10 is a member that receives the moisture that the evaporation part 11 could not absorb completely, and is provided below the evaporation part 11. The water receiving part 10 is arranged so as to cover at least the lower surface of the evaporation part 11. With such a configuration, it is possible to surely receive the moisture that the evaporation part 11 could not absorb completely. Also, by arranging it so as to cover the lower surface of the evaporation part 11, when moisture accumulates in the water receiving part 10 and the water surface rises, the water surface can be brought into contact with the lower surface of the evaporation part 11. Here, if the configuration of the evaporation part 11 is porous as shown in FIG. 3, the moisture accumulated in the water receiving part 10 can be sucked up into the evaporation part 11 by the surface tension acting on the plurality of gaps 32. Note that the water receiving part 10 may be arranged in any manner as long as it is arranged so as to cover at least the lower surface of the evaporation part 11. For example, as shown in FIG. 1, in addition to the evaporation part 11, it may be configured to cover the lower surfaces of the first radiator 14 and the second radiator 15. With such a configuration, when moisture accumulates in the water receiving part 10 and the water surface rises, the water surface can be brought into contact not only with the lower surface of the evaporation part 11 but also with the lower surfaces of the first radiator 14 and the second radiator 15. With such a configuration, the moisture accumulated in the water receiving part 10 can be evaporated by heating the water surface by the first radiator 14 and the second radiator 15. Also, when the direction in which the refrigerant circulates is changed by the four-way valve and the first radiator 14 and the second radiator 15 function as heat absorbers, there is a possibility that the first radiator 14 and the second radiator 15 may condense. Even in such a case, the water receiving part 10 can receive the moisture generated in the first radiator 14 and the second radiator 15.

[0032] The water guiding part 12 is a member that communicates the air supply duct 8 and the exhaust air duct 9 and guides the moisture generated in the heat absorber 13 of the air supply duct 8 to the evaporation part 11 of the exhaust air duct 9. The water guiding part 12 is provided so as to cover the lower part of the heat absorber 13. Here, the positional relationship between the heat absorber 13 and the evaporation part 11 is such that the heat absorber 13 is located above the evaporation part 11 in the state where the heat exchange type ventilation device 1 is installed as shown in FIG. 1. Therefore, the moisture generated in the heat absorber 13 drips downward onto the lower water guiding part 12 by gravity, and is further guided by the water guiding part 12 to the lower evaporation part 11. Note that the shape of the water guiding part 12 may be any shape as long as it can guide the moisture generated in the heat absorber 13 to the evaporation part 11. For example, in FIG. 1, the water guiding part 12 is composed of a dish-shaped part 21 that covers the lower surface of the heat absorber 13 and a cylindrical part 22 that protrudes from the center of the dish-shaped part 21 and communicates the air supply duct 8 and the exhaust air duct 9. If the evaporation part 11 is arranged vertically below the heat absorber 13, the moisture accumulated in the dish-shaped part 21 can pass through the cylindrical part 22 according to gravity and directly drip onto the evaporation part 11 from the tip of the cylindrical part 22. Note that if the evaporation part 11 is porous as shown in FIG. 3, since it is possible to suck up water from the water receiving part 10, the moisture may be dripped from the water guiding part 12 to the water receiving part 10 and indirectly guided to the evaporation part 11. Such a configuration is also included in the configuration for guiding the moisture generated in the heat absorber 13 to the evaporation part 11.

[0033] By adopting such a configuration that the exhaust flow 20 passes through the first radiator 14, the evaporation part 11, and the second radiator 15 in this order, the heating of the evaporation part 11 and the exhaust heat of the refrigeration cycle 3 can be shared between the first radiator 14 and the second radiator 15. In other words, compared with the case of heating with a single second heat exchanger 109 as in the prior art, the load on the compressor 16 can be reduced, and a heat exchange type ventilation device 1 that can be operated energy-efficiently can be provided.

[0034] Note that two or more evaporation sections 11 may be provided, or three or more radiators may be provided. As long as the evaporation sections 11 and the radiators are alternately arranged and heating and heat absorption to the exhaust air flow 20 are alternately performed. For example, as shown in FIG. 4, the exhaust air flow 20 may pass through the first radiator 14, the first evaporation section 11a, the second radiator 15, the second evaporation section 11b, and the third radiator 18 in this order. Even with such a configuration, it is possible to provide the heat exchange type ventilation device 1 that can reduce the load on the compressor 16 and operate in an energy-saving manner compared to the conventional one. (Summary of the Invention) The heat exchange type ventilation device according to the present invention is a heat exchange type ventilation device having a refrigeration cycle, and includes an air supply air passage for conveying an air supply flow flowing from the outside to the inside, an exhaust air passage for conveying an exhaust air flow flowing from the inside to the outside, a heat exchanger for performing heat exchange between the air supply flow and the exhaust air flow, a heat absorber belonging to the refrigeration cycle and cooling the air supply flow after passing through the heat exchanger, an evaporation section for evaporating the moisture generated in the heat absorber of the air supply air passage by cooling in the exhaust air passage, a water guiding section for guiding the moisture generated in the heat absorber of the air supply air passage to the evaporation section of the exhaust air passage by communicating the air supply air passage and the exhaust air passage, a first radiator belonging to the refrigeration cycle and heating the exhaust air flow after passing through the heat exchanger and before passing through the evaporation section, and a second radiator belonging to the refrigeration cycle and heating the exhaust air flow after passing through the evaporation section.

[0035] According to such a configuration, it is possible to provide a heat exchange type ventilation device that can reduce the load on the compressor and operate in an energy-saving manner.

[0036] Further, the refrigeration cycle may include a compressor for compressing the refrigerant and an expander for expanding the refrigerant, and the refrigerant may circulate in the order of the compressor, the second radiator, the first radiator, the expander, and the heat absorber.

[0037] Further, the heat absorber may be located above the water guiding section, and the evaporation section may be located below the water guiding section.

[0038] According to such a configuration, the moisture generated in the heat absorber easily moves to the evaporation section according to gravity.

[0039] Further, it may be configured to further include a water receiving part for storing water below the evaporation part.

[0040] According to such a configuration, the water that could not be completely absorbed by the evaporation part can be received by the water receiving part.

[0041] Further, the water receiving part is arranged to cover the lower surfaces of the evaporation part, the first radiator, and the second radiator, and the first radiator and the second radiator may be configured to heat the water accumulated in the water receiving part.

[0042] According to such a configuration, the water accumulated in the water receiving part can be heated and evaporated, and exhausted together with the exhaust flow.

[0043] Further, the evaporation part may be composed of a plurality of fibers, and may be configured to absorb the water accumulated in the water receiving part at the gaps between adjacent fibers.

[0044] According to such a configuration, when a certain amount of water accumulates in the water receiving part, the evaporation part can automatically absorb water from the water receiving part.

Industrial Applicability

[0045] The heat exchange type ventilation device according to the present disclosure is useful as a dehumidifiable heat exchange type ventilation device.

Explanation of Reference Numerals

[0046] 1 Heat exchange type ventilation device 2 Total heat exchange element 3 Refrigeration cycle 4 Indoor air inlet 5 Outdoor air inlet 6 Supply air inlet 7 Exhaust air outlet 8 Supply air duct 9 Exhaust air duct 10 Water receiving part 11 Evaporation part 11a First evaporation part 11b Second evaporation part 12 Water guiding part 13 Heat absorber 14 First radiator 15 Second radiator 16 Compressor 17 Expander 18 Third radiator 19 Intake air flow 20 Exhaust air flow 21 Dish-shaped part 22 Cylindrical part 31 Fiber 32 Gap 101 Outdoor air treatment device 102 Heat exchange unit 103 Heat pump unit 104 Sensible heat exchange unit 105 Intake air duct 106 Exhaust air duct 107 Evaporation unit 108 Vaporization member 109 Second heat exchanger 110 Compressor

Claims

1. A heat exchange type ventilation device having a refrigeration cycle, comprising: 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 heat exchanger for performing heat exchange between the air supply flow and the exhaust flow; A heat absorber belonging to the refrigeration cycle for cooling the air supply flow after passing through the heat exchanger, and an evaporation section for evaporating moisture generated in the heat absorber of the air supply duct by the cooling in the exhaust duct; A water guide section for guiding moisture generated in the heat absorber of the air supply duct to the evaporation section of the exhaust duct by communicating the air supply duct and the exhaust duct; A first radiator belonging to the refrigeration cycle for heating the exhaust flow after passing through the heat exchanger and before passing through the evaporation section; A second radiator belonging to the refrigeration cycle for heating the exhaust flow after passing through the evaporation section. A heat exchange type ventilation device provided with.

2. The refrigeration cycle includes: A compressor for compressing the refrigerant; An expander for expanding the refrigerant, and The heat exchange type ventilation device according to claim 1, wherein the refrigerant circulates in the order of the compressor, the second radiator, the first radiator, the expander, and the heat absorber.

3. The heat absorber is located above the water guide section, and The evaporation section is located below the water guide section. The heat exchange type ventilation device according to claim 1.

4. The heat exchange type ventilation device according to claim 1, further comprising a water receiving section for storing the moisture below the evaporation section.

5. The water receiving section is: Arranged so as to cover the lower surfaces of the evaporation section, the first radiator, and the second radiator, and The first radiator and the second radiator are: The heat exchange type ventilation device according to claim 4, which heats the water accumulated in the water receiving section.

6. The evaporation section is: Composed of a plurality of fibers, and absorbs the water accumulated in the water receiving section in the gaps between the adjacent plurality of fibers. The heat exchange type ventilation device according to claim 4.

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