WO2005095868A1

WO2005095868A1 - Moisture conditioning device

Info

Publication number: WO2005095868A1
Application number: PCT/JP2005/005965
Authority: WO
Inventors: Nobuki Matsui; Satoshi Ishida; Tomohiro Yabu
Original assignee: Daikin Industries, Ltd.
Priority date: 2004-03-31
Filing date: 2005-03-29
Publication date: 2005-10-13
Also published as: JP2005283041A

Abstract

A moisture conditioning device, wherein a refrigerant circuit (60) is formed by connecting a compressor (63), a four-way selector valve (64), a first adsorbing heat exchanger (61), an expansion valve (65), and a second adsorbing heat exchanger (62) to each other so that the circulation of a refrigerant can be reversed for performing a vapor compression refrigerating cycle. Adsorbent for adsorbing and desorbing moisture is carried on the surfaces of the first adsorbing heat exchanger (61) and the second adsorbing heat exchanger (62). To alternately adsorb and desorb the moisture by the first adsorbing heat exchanger (61) and the second adsorbing heat exchanger (62), the switching mechanism (four-way selector valve) (64) is switched to change the circulating direction of the refrigerant in the refrigerant circuit (60). In addition, before the circulation of the refrigerant is switched, the compressor (63) is stopped to lower a pressure difference between the high-pressure side and low-pressure side of the refrigerant circuit (60).

Description

Specification

Humidity control device

Technical field

The present invention relates to a humidity control apparatus for controlling humidity using an adsorbent, and more particularly to a humidity control apparatus having a refrigerant circuit of a vapor compression refrigeration cycle.

Background art

[0002] Conventionally, a humidity control apparatus using an adsorbent is configured to dehumidify or humidify air by utilizing an adsorbing action and a desorbing action of moisture by the adsorbent. When the amount of water adsorbed by the adsorbent reaches a saturation range, it is necessary for the humidity controller to desorb water and regenerate the water. However, at that time, if the adsorption and the regeneration are simply performed alternately, the dehumidification and the regeneration can be performed only intermittently.

[0003] Therefore, in this type of humidity control apparatus, two adsorbing members including an adsorbent are used, and the one used on the adsorbing side and the one used on the regenerating side are alternately switched so that the air on the adsorbing side is always changed. A method of supplying only the air on the regeneration side or only the air on the regeneration side to the room is known (for example, see Patent Document 1). In this method, the dehumidifying operation or the humidifying operation is continuously performed by switching between the adsorption side and the regeneration side every time a predetermined time elapses while performing the adsorption operation with one adsorption member while performing the regeneration operation with the other. (For example, see Patent Document 1).

[0004] The regenerating operation is performed between the suction operation and the next suction operation. Therefore, in order to perform the suction operation in a short time, it is necessary to heat the suction member. For this reason, in the humidity control apparatus, the adsorption member is heated by the heat of the refrigerant using the refrigerant circuit of the vapor compression refrigeration cycle.

Patent Document 1: Japanese Patent Application Laid-Open No. 2003-028458

Disclosure of the invention

Problems to be solved by the invention

[0005] In the humidity control apparatus, in order to efficiently heat the adsorbent during regeneration, it is conceivable that the condenser of the refrigerant circuit and the adsorbing member are integrated. Specifically, the configuration is such that the adsorbent is carried on the fins of the condenser. In this case, suction using two suction members In order to perform the same operation as switching between the side and the regeneration side alternately, the two heat exchangers of the refrigerant circuit may each be one carrying an adsorbent. This allows efficient operation by switching the circulation direction of the refrigerant in the refrigerant circuit while using heat exchange as the evaporator on the adsorption side and heat exchange as the condenser on the regeneration side. .

[0006] A four-way switching valve is generally used to switch the direction of circulation of the refrigerant in the refrigerant circuit. However, when the humidity control device is operated, the frequency of switching the four-way switching valve is much higher than when the air conditioning device switches between cooling and heating and the refrigeration device performs reverse cycle defrosting operation (for example, Switching may be required every few minutes). When the four-way switching valve is switched, a relatively loud noise is generated in the four-way switching valve or the pipe as the refrigerant flows from the high pressure side to the low pressure side. In particular, when the switching frequency increases, the frequency of sound generation also increases, and driving noise becomes a major problem.

[0007] The present invention has been made in view of the above point, and has as its object to avoid the problem of noise when switching the refrigerant circulation direction.

Means for solving the problem

[0008] Specifically, as shown in FIG. 1, the first invention comprises a compressor (63), a switching mechanism (64), a first heat exchange (61), an expansion mechanism (65), and a second heat exchange. And a refrigerant circuit (60) for performing a vapor compression refrigeration cycle. The refrigerant circuit (60) is connected to the first heat exchanger (61) and the second heat exchanger (62). It is intended for a humidity control device whose surface carries an adsorbent that adsorbs and desorbs moisture. Then, in order to alternately adsorb and desorb moisture in the first heat exchanger (61) and the second heat exchanger (62), the cut-out structure (64) is switched to change the refrigerant circuit (60). A circulation switching means (71) for switching the circulation direction of the refrigerant is provided. In addition, before the circulation switching of the circulation switching means (71), a differential pressure reducing means (80) for reducing the differential pressure between the high pressure side and the low pressure side of the refrigerant circuit (60) is provided.

[0009] In a second aspect based on the first aspect, the differential pressure reducing means (80) is a compressor.

(63) is configured to stop.

[0010] In a third aspect based on the first aspect, the compressor (63) is configured to have a variable capacity, and the differential pressure reducing means (80) reduces the operating capacity of the compressor (63). Configured to reduce It is.

[0011] In a fourth aspect based on the first aspect, the expansion mechanism (65) is constituted by an expansion valve having a variable opening, and the differential pressure reducing means (80) controls the opening of the expansion valve. It is configured to open.

[0012] In a fifth aspect based on the first aspect, the differential pressure reducing means (80) includes a bypass passage (81) that bypasses the expansion mechanism (65) and a bypass passage (81). And a normally closed bypass valve ( ₈₂ ) provided so that the bypass valve (82) is opened before the circulation switching of the circulation switching means (71).

[0013] In a sixth aspect based on the first aspect, the differential pressure reducing means (80) includes a bypass passage (81) connecting the discharge side and the suction side of the compressor (63), A normally closed bypass valve (82) provided in the bypass passage (81), and configured to open the bypass valve (82) before the circulation switching of the circulation switching means (71).

[0014] In a seventh aspect based on the fifth or sixth aspect, there is provided a flow rate adjusting mechanism (83) provided in the pressure difference reducing means (80) force bypass path (81).

[0015] In an eighth aspect based on the first aspect, the differential pressure reducing means (80) is connected to a compressor (63) and has a gas pipe (6b, 6c) through which a gas refrigerant always flows. A normally open / close valve (85) provided in the air conditioner is configured to close the on / off valve (85) before the circulation switching of the circulation switching means (71).

That is, in the first invention, of the first heat exchanger (61) and the second heat exchanger (62) of the refrigerant circuit (60), moisture is adsorbed by the adsorbent of the heat exchanger serving as an evaporator. Then, in the heat exchanger that becomes a condenser, moisture is desorbed and the adsorbent is regenerated. Therefore, for example, when the air on the adsorption side is supplied into the room, the dehumidifying operation is performed, and when the air on the regeneration side is supplied into the room, the humidifying operation is performed. In both cases of the dehumidifying operation and the humidifying operation, the switching mechanism (64) switches the direction of circulation of the refrigerant, and the continuous operation of the dehumidification and the humidification is performed.

At the time of this switching, before the differential pressure reducing means (80) switches the cutting configuration (64) of the circulation switching means (71), the differential pressure between the high pressure side and the low pressure side of the refrigerant circuit (60) is reduced. As a result, the operation of the refrigerant flowing instantaneously from the high pressure side to the low pressure side is suppressed. Specifically, in the second invention, the compressor (63) is stopped for a predetermined time before the differential pressure reducing means (80) switches the switching mechanism (64) of the circulation switching means (71). After the switching of the switching mechanism (64), the operation of the compressor (63) is restarted. By stopping the compressor (63) by the differential pressure reducing means (80), the differential pressure between the high pressure side and the low pressure side of the refrigerant circuit (60) is reduced.

In the third invention, before the differential pressure reducing means (80) switches the switching mechanism (64) of the circulation switching means (71), the capacity of the compressor (63) is reduced, and After switching to (64), return the capacity of compressor (63). The pressure difference between the high pressure side and the low pressure side of the refrigerant circuit (60) is reduced by reducing the capacity of the compressor (63) by the differential pressure reducing means (80).

[0020] In the fourth invention, before the differential pressure reducing means (80) switches the switching mechanism (64) of the circulation switching means (71), the switching mechanism (65) increases the opening of the expansion valve (65). After switching of 64), return the opening of the expansion valve (65). The differential pressure between the high pressure side and the low pressure side of the refrigerant circuit (60) is reduced by increasing the degree of opening of the expansion valve (65) by the differential pressure reducing means (80).

[0021] In the fifth invention and the sixth invention, before the differential pressure reducing means (80) switches the switching structure (64) of the circulation switching means (71), the bypass valve (82) is opened and switched off. After switching the configuration (64), close the binos valve (82). The differential pressure between the high pressure side and the low pressure side of the refrigerant circuit (60) is reduced by the opening of the bypass valve (82) by the differential pressure reducing means (80).

[0022] In the seventh aspect, the amount of refrigerant flowing through the bypass path (81) is adjusted by the flow rate adjusting mechanism (83), and the noise generated by the refrigerant when the bypass valve (82) is switched is suppressed.

Further, in the eighth invention, before the differential pressure reducing means (80) switches the switching mechanism (64) of the circulation switching means (71), the on-off valve (85) is closed and the switching mechanism (64) is closed. After switching, open and close valve (85). By closing the on-off valve (85) by the differential pressure reducing means (80), the amount of circulating refrigerant is reduced, and the differential pressure between the high pressure side and the low pressure side of the refrigerant circuit (60) is reduced.

The invention's effect

[0024] Therefore, according to the present invention, the differential pressure between the high pressure side and the low pressure side of the refrigerant circuit (60) is reduced before switching the refrigerant circulation, so that the refrigerant instantaneously moves from the high pressure side to the low pressure side. The operation of flowing the fluid does not occur, and the noise generated by the refrigerant can be prevented. In particular, the sound of the refrigerant does not matter even if the switching frequency is high.

According to the second invention, the compressor (63) is stopped before the switching of the switching mechanism (64). With this configuration, the pressure difference between the high-pressure side and the low-pressure side of the refrigerant circuit (60) can be reliably reduced, so that the generation of refrigerant at the time of switching can be reliably prevented.

[0026] Further, according to the third to sixth and eighth inventions, since the operation of the compressor (63) is continued, a decrease in the humidity control ability can be suppressed.

[0027] According to the seventh aspect of the present invention, the flow rate adjusting mechanism (83) is provided in the bypass passage (81), so that the refrigerant gas bypass valve (82) is opened when the bypass valve (82) is opened. It is possible to suppress the operation in which the high-pressure-side force also momentarily flows to the low-pressure side. The sound generated by the refrigerant due to the opening of the bypass valve (82) is suppressed.

Brief Description of Drawings

FIG. 1 is a circuit diagram showing a refrigerant circuit of the humidity control apparatus of the first embodiment.

FIG. 2 is a schematic configuration diagram showing a humidity control apparatus of Embodiment 1.

FIG. 3 is a perspective view showing an adsorption heat exchanger of the first embodiment.

FIG. 4 is a schematic configuration diagram of a humidity control apparatus showing a flow of air in a first operation of the dehumidifying operation of the first embodiment.

FIG. 5 is a schematic configuration diagram of a humidity control apparatus showing an air flow in a second operation of the dehumidifying operation of the first embodiment.

FIG. 6 is a schematic configuration diagram of a humidity control apparatus showing an air flow in a first operation of the humidification operation of the first embodiment.

FIG. 7 is a schematic configuration diagram of a humidity control apparatus showing an air flow in a second operation of the humidification operation of the first embodiment.

FIG. 8 is a circuit diagram showing a refrigerant circuit of a humidity control apparatus according to a fourth embodiment.

FIG. 9 is a circuit diagram showing a refrigerant circuit of a humidity control apparatus according to a fifth embodiment.

FIG. 10 is a circuit diagram showing a refrigerant circuit of a humidity control apparatus according to a sixth embodiment.

Explanation of symbols

[0029] 10 Humidity control device

60 Refrigerant circuit

61 1st adsorption heat exchanger (1st heat exchanger)

62 Second adsorption heat exchanger (second heat exchanger) 64 Four-way switching valve (switching mechanism)

65 Expansion valve (expansion mechanism)

70 Controller

71 Circulation switching means

80 Differential pressure reducing means

81 Bypass Road

82 Bypass valve

83 Flow controller (Flow controller)

84 Valve control means

85 On-off valve

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 to 3, the humidity control apparatus (10) of the present embodiment performs dehumidification and humidification of room air, and includes a flat hollow rectangular parallelepiped casing (11). The casing (11) houses a refrigerant circuit (60) and the like, and the refrigerant circuit (60) includes the first adsorption heat exchanger (61) and the second adsorption heat exchanger (62), Equipped with a compressor (63)!

As shown in FIG. 3, each of the first adsorption heat exchanger (61) and the second adsorption heat exchanger (62) is a cross-fin type fin “and” tube type heat exchanger. The first heat exchanger and the second heat exchanger are configured. The first adsorption heat exchanger (61) and the second adsorption heat exchanger (62) are composed of a number of aluminum fins (6a) formed in a rectangular plate shape, and a copper piercing through the fins (6a). And a heat transfer tube (6b). An adsorbent such as zeolite is supported on the outer surface of the fin (6a). The first adsorption heat exchanger (61) forms a first adsorption member, and the second adsorption heat exchanger (62) forms a second adsorption member.

Next, an internal structure of the casing (11) will be described with reference to FIG. In FIG. 2B, the lower side is the front side of the casing (11), and the upper side is the rear side of the casing (11). In the following description, “right”, “left”, “upper”, and “lower” indicate Means in plane.

[0034] The casing (11) is formed in a flat box shape having a substantially square shape in plan view. In the casing (11), the left side plate (12) and the right side plate (13), and the front plate (14) and the rear plate (15) are located in the thickness direction of the casing (11), and are mutually separated. It constitutes two opposing end faces. The left side plate (12) has an outdoor air intake (21) formed near the back plate (15), and an indoor air intake (22) formed near the front plate (14). On the other hand, on the right side plate (13) of the casing (11), an exhaust outlet (23) is formed near the back plate (15), and an air supply outlet (24) is formed near the front plate (14). ing. The outdoor air inlet (21) and the indoor air inlet (22) constitute an air inlet, and the exhaust outlet (23) and the supply air outlet (24) constitute an air outlet. ing.

[0035] Inside the casing (11), a first partition plate (31) is provided upright toward the right side plate (13) from the center in the left-right direction. The inner space (16) of the casing (11) is divided into right and left by a first partition (31). The right side of the first partition plate (31) becomes the first space (17), and the left side of the first partition plate (31) becomes the second space (18).

[0036] The first space (17) of the casing (11) is divided into a front space and a back space by a seventh partition plate (37). The compressor (63) and the exhaust fan (26) of the refrigerant circuit (60) are arranged in a space on the back side of the first space (17). In addition, an expansion valve (65) and a four-way switching valve (64) of the refrigerant circuit (60) are also arranged in the space on the rear side (not shown). On the other hand, an air supply fan (25) is arranged in a space on the front side in the first space (17). The exhaust fan (26) is connected to an exhaust outlet (23), and the air supply fan (25) is connected to an air outlet (24).

[0037] A second partition (32), a third partition (33), and a sixth partition (36) are provided in the second space (18) of the casing (11). The second partition plate (32) is set up near the front plate (14), and the third partition plate (33) is set up near the rear plate (15). The second space (18) is partitioned into three spaces by a second partition plate (32) and a third partition plate (33) with a frontal force and a rearward force. The sixth partition plate (36) is provided in a space between the second partition plate (32) and the third partition plate (33). The sixth partition (36) is provided upright at the center in the left-right direction of the second space (18). [0038] The space sandwiched between the second partition plate (32) and the third partition plate (33) is partitioned left and right by a sixth partition plate (36). Of these, the space on the right side constitutes a first heat exchange chamber (41), in which the first adsorption heat exchanger (61) is arranged. On the other hand, the space on the left side constitutes a second heat exchange chamber (42), in which the second adsorption heat exchange (62) is arranged. That is, the first heat exchange chamber (41) and the second heat exchange chamber (42) are arranged adjacent to each other. The first heat exchange chamber (41) forms a first processing space, and the second heat exchange chamber (42) forms a second processing space.

In the space between the third partition plate (33) and the rear plate (15) of the casing (11) in the second space (18), a fifth partition plate (35) is provided. I have. The fifth partition plate (35) is provided so as to cross the center in the height direction of the space, and partitions the space up and down (see FIG. 2 (A)). The space above the fifth partition plate (35) forms a first inflow channel (43), and the space below the fifth partition plate (35) forms a first outflow channel (44). Further, the first inflow path (43) communicates with the outdoor air suction port (21), and the first outflow path (44) communicates with the exhaust air outlet (23) via the exhaust fan (26).

On the other hand, in the space between the second partition (32) and the front plate (14) of the casing (11) in the second space (18), a fourth partition (34) is provided. ing. The fourth partition plate (34) is provided so as to cross the center in the height direction of the space, and partitions the space up and down (see FIG. 2 (C)). The space above the fourth partition plate (34) forms a second inflow channel (45), and the space below the fourth partition plate (34) forms a second outflow channel (46). The second inflow path (45) communicates with the indoor air suction port (22), and the second outflow path (46) communicates with the air supply outlet (24) via the air supply fan (25). I have.

As described above, the first inflow path (43) and the first outflow path (44) are connected to the first heat exchange chamber (41) and the second heat exchange chamber (42) by the first heat exchange chamber (42). They are arranged so as to overlap along the third partition plate (33) as a side surface. On the other hand, the second inflow path (45) and the second outflow path (46) face the third partition (33) of the first heat exchange chamber (41) and the second heat exchange chamber (42). They are arranged so as to overlap along a second partition plate (32) as a second side surface. The first inflow path (43) and the second inflow path (45) constitute an inflow path, and the first outflow path (44) and the second outflow path (46) constitute an outflow path. . [0042] Four openings (51 to 54) are formed in the third partition plate (33) (see Fig. 2 (A)). O The four openings (51 to 54) are arranged in a matrix direction. Are located in close proximity to each other, that is, two squares are arranged vertically and horizontally. The first opening (51) connects the first inflow path (43) to the first heat exchange chamber (41), and the second opening (52) connects the first inflow path (43) to the first inflow path (43). 2 It communicates with the heat exchange chamber (42). The third opening (53) connects the first outflow passage (44) to the first heat exchange chamber (41), and the fourth opening (54) connects the first outflow passage (44) to the first outflow passage (44). 2 Communicates with the heat exchange chamber (42).

[0043] Four openings (55 to 58) are formed in the second partition plate (32) (see FIG. 2C). O The four openings (55 to 58) are arranged in a matrix direction. Are located in close proximity to each other, that is, two squares are arranged vertically and horizontally. The fifth opening (55) communicates the second inflow path (45) with the first heat exchange chamber (41), and the sixth opening (56) communicates with the second inflow path (45). 2 It communicates with the heat exchange chamber (42). The seventh opening (57) connects the second outflow passage (46) with the first heat exchange chamber (41), and the eighth opening (58) connects the second outflow passage (46) with the second outflow passage (46). 2 Communicates with the heat exchange chamber (42).

As shown in FIG. 4 to FIG. 7, dampers (71 to 78) configured as opening / closing means for opening and closing each of the eight openings (51 to 58) to switch between air flow and shutoff are provided. Provided. That is, these dampers (71 to 78) are provided with the second partition plate (partition) (partition) between each inflow path (43, 45) and each outflow path (44, 46) and each heat exchange chamber (41, 42). 32) and the third partition plate (33).

Specifically, a first damper (71) and a second damper (72) are provided in the first opening (51) and the second opening (52), respectively. Two dampers (72) are arranged adjacent to each other. The third opening (53) and the fourth opening (54) are provided with a third damper (73) and a fourth damper (74), and the third damper (73) and the fourth damper (74) are mutually connected. They are located next to each other. The fifth opening (55) and the sixth opening (56) are provided with a fifth damper (75) and a sixth damper (76), and the fifth damper (75) and the sixth damper (76) are mutually connected. They are located next to each other. The seventh opening (57) and the eighth opening (58) are provided with a seventh damper (77) and an eighth damper (78), and the seventh damper (77) and the eighth damper (78) are mutually connected. They are located next to each other. Next, the refrigerant circuit (60) will be described with reference to FIG.

[0047] The refrigerant circuit (60) includes a compressor (63), a four-way switching valve (64), a first adsorption heat exchange (61), an expansion valve (65), and a second adsorption heat exchange (62). They are sequentially connected by a refrigerant pipe (6c) to form a closed circuit. The refrigerant circuit (60) is configured such that the charged refrigerant circulates to perform a vapor compression refrigeration cycle.

[0048] The four-way switching valve (64) constitutes a switching mechanism for switching the circulation direction of the refrigerant in the refrigerant circuit (60). Specifically, a discharge pipe (6d) of a compressor (63) is connected to a first port of the four-way switching valve (64), and a suction pipe of the compressor (63) is connected to a second port. (6e) is connected. One end of the first adsorption heat exchange (61) is connected to the third port of the four-way switching valve (64), and one end of the second adsorption heat exchange (62) is connected to the fourth port. Is connected. In the refrigerant circuit (60), the circulation of the refrigerant is reversible by the four-way switching valve (64).

[0049] The expansion valve (65) constitutes an expansion mechanism for expanding the refrigerant.

[0050] The refrigerant circuit (60) includes an adsorbent generated when water in the air is adsorbed by the adsorbent in the second adsorption heat exchange (62) or the first adsorption heat exchanger (61) serving as an evaporator. The refrigerant absorbs heat. Further, in the refrigerant circuit (60), in the first adsorption heat exchanger (61) or the second adsorption heat exchanger (62) serving as a condenser, the refrigerant heats the adsorbent and removes moisture from the adsorbent. Let go.

[0051] The refrigerant circuit (60) is configured to perform the adsorption and desorption of moisture in the first adsorption heat exchanger (61) or the second adsorption heat exchanger (62) with the first adsorption heat exchange (61). The second adsorption heat exchange (62) is performed alternately to continuously dehumidify or humidify the air.

Further, the refrigerant circuit (60) is controlled by a controller (70). The controller (70) is provided with circulation switching means (71) and differential pressure reducing means (80).

[0053] The circulation switching means (71) is provided in the first adsorption heat exchanger (61) and the second adsorption heat exchanger (62) to alternately adsorb and desorb moisture. It is configured to switch the valve (64) to switch the circulation direction of the refrigerant in the refrigerant circuit (60). The circulation switching means (71) is configured to switch the four-way switching valve (64) every three minutes, for example.

[0054] The differential pressure reducing means (80) is provided before the circulation switching of the circulation switching means (71), that is, Before switching the four-way switching valve (64), the differential pressure between the high pressure side and the low pressure side of the refrigerant circuit (60) is reduced. Specifically, the differential pressure reducing means (80) is configured to stop the compressor (63), and before the four-way switching valve (64) of the circulation switching means (71) switches the compressor (63). ) Is stopped for a predetermined time, and after the four-way switching valve (64) is switched, the operation of the compressor (63) is restarted.

[0055] The differential pressure reducing means (80) reduces the differential pressure between the high pressure side and the low pressure side of the refrigerant circuit (60) by stopping the compressor (63), thereby suppressing the noise generated by the refrigerant during switching. I try to do it.

[0056] Driving operation

Next, the humidity control operation of the humidity control device (10) will be described. In this humidity control device (10), the dehumidification operation and the humidification operation can be switched!

[0057] << Dehumidification operation >>

During the dehumidification operation, the air supply fan (25) and the exhaust fan (26) are operated in the humidity control device (10). The humidity control device (10) takes in the outdoor air (OA) as the first air and supplies it to the room, while taking in the room air (RA) as the second air and discharges it to the outside.

First, the first operation during the dehumidifying operation will be described with reference to FIGS. 1 and 4. In the first operation, the adsorbent is regenerated in the first adsorption heat exchanger (61), and the outdoor air (OA) as the first air is dehumidified in the second adsorption heat exchanger (62). .

[0059] During the first operation, in the refrigerant circuit (60), the four-way switching valve (64) is switched to the state shown by the solid line in Fig. 1. When the compressor (63) is operated in this state, the refrigerant circulates in the refrigerant circuit (60), the first adsorption heat exchanger (61) becomes a condenser, and the second adsorption heat exchanger (62) evaporates. A first refrigeration cycle operation is performed.

[0060] Specifically, the refrigerant discharged from the compressor (63) is condensed by releasing heat in the first adsorption heat exchanger (61), and then sent to the expansion valve (65) to be decompressed. . The decompressed refrigerant absorbs heat in the second adsorption heat exchange (62), evaporates, and is then sucked into the compressor (63) and compressed. Then, the compressed refrigerant is discharged again from the compressor (63).

In the first operation, the dampers (71 to 78) of the openings (51 to 58) are switched. Thereby, the second opening (52), the third opening (53), the fifth opening (55), and the eighth opening (58) are opened, and the first opening (51), the fourth opening (54) and The sixth opening (56) and the seventh opening (57) are closed. Then, as shown in FIG. 4, indoor air (RA) as second air is supplied to the first adsorption heat exchanger (61), and outdoor air as first air is supplied to the second adsorption heat exchanger (62). (OA) is supplied.

[0062] Specifically, the second air flowing from the indoor air suction port (22) flows from the second inflow path (45) to the first heat exchange chamber (41) through the fifth opening (55). Sent in. In the first heat exchange chamber (41), the second air passes through the first adsorption heat exchange (61) downward from above. In the first adsorption heat exchanger (61), the adsorbent carried on the outer surface is heated by the refrigerant, and moisture is desorbed from the adsorbent. The water desorbed from the adsorbent is released to the second air passing through the first adsorption heat exchange (61). The second air to which water has been given by the first adsorption heat exchange (61) flows out of the first heat exchange chamber (41) through the third opening (53) to the first outflow path (44). Thereafter, the second air is sucked into the exhaust fan (26), and is exhausted from the exhaust air outlet (23) to the outside as exhaust air (EA).

[0063] On the other hand, the first air that has flowed in from the outdoor air suction port (21) is sent from the first inflow path (43) to the second heat exchange chamber (42) through the second opening (52). In the second heat exchange chamber (42), the first air passes upward through the second adsorption heat exchanger (62). In the second adsorption heat exchange (62), moisture in the first air is adsorbed on the adsorbent carried on the outer surface. The heat of adsorption generated at that time is absorbed by the refrigerant. The first air dehumidified by the second adsorption heat exchanger (62) flows out of the second heat exchange chamber (42) through the eighth opening (58) to the second outflow path (46). Thereafter, the first air is sucked into the air supply fan (25), and is supplied from the air supply outlet (24) to the room as supply air (SA).

Next, the second operation at the time of the dehumidifying operation will be described with reference to FIGS. 1 and 5. In the second operation, the adsorbent is regenerated in the second adsorption heat exchange (62), and the outdoor air (OA) as the first air is dehumidified in the first adsorption heat exchanger (61).

[0065] During the second operation, in the refrigerant circuit (60), the four-way switching valve (64) is switched to the state shown by the broken line in FIG. When the compressor (63) is operated in this state, the refrigerant circulates in the refrigerant circuit (60), the first adsorption heat exchanger (61) becomes an evaporator, and the second adsorption heat exchanger (62) condenses. A second refrigeration cycle operation is performed.

Specifically, the refrigerant discharged from the compressor (63) is condensed by releasing heat in the second adsorption heat exchanger (62), and then sent to the expansion valve (65) to be decompressed. . The decompressed refrigerant absorbs heat in the first adsorption heat exchange (61), evaporates, and is then sucked into the compressor (63) and compressed. Then, the compressed refrigerant is discharged again from the compressor (63).

In the second operation, by switching the dampers (71-78) of the openings (51-58), the first opening (51), the fourth opening (54), and the sixth opening (56) are switched. ) And the seventh opening (57) are in an open state, and the second opening (52), the third opening (53), the fifth opening (55), and the eighth opening (58) are in a closed state. Then, as shown in FIG. 5, outdoor air (OA) as the first air is supplied to the first adsorption heat exchanger (61), and indoor air (OA) as the second air is supplied to the second adsorption heat exchange (62). RA) is supplied.

[0068] Specifically, the second air flowing from the indoor air suction port (22) flows from the second inflow path (45) to the second heat exchange chamber (42) through the sixth opening (56). Sent in. In the second heat exchange chamber (42), the second air passes through the second adsorption heat exchange (62) downward from above. In the second adsorption heat exchanger (62), the adsorbent carried on the outer surface is heated by the refrigerant, and moisture is desorbed from the adsorbent. The water desorbed from the adsorbent is released to the second air passing through the second adsorption heat exchange (62). The second air to which water has been imparted by the second adsorption heat exchanger (62) flows out to the first outflow path (44) through the second heat exchange chamber (42) and the fourth opening (54). Thereafter, the second air is sucked into the exhaust fan (26), and is discharged from the exhaust air outlet (23) to the outside as exhaust air (EA).

[0069] On the other hand, the first air that has flowed in from the outdoor air suction port (21) is sent from the first inflow path (43) to the first heat exchange chamber (41) through the first opening (51). In the first heat exchange chamber (41), the first air passes upward through the first adsorption heat exchanger (61). In the first adsorption heat exchange (61), moisture in the first air is adsorbed on the adsorbent carried on the outer surface. The heat of adsorption generated at that time is absorbed by the refrigerant. The first air dehumidified by the first adsorption heat exchanger (61) flows out of the first heat exchange chamber (41) through the seventh opening (57) to the second outflow passage (46). Thereafter, the first air is sucked into the air supply fan (25), and is supplied from the air supply outlet (24) to the room as supply air (SA). [0070] << Humidification operation >>

During the humidifying operation, the humidity control device (10) operates the air supply fan (25) and the exhaust fan (26). The humidity control device (10) takes in the room air (RA) as the first air and discharges it outside the room, while taking in the outdoor air (OA) as the second air and supplies it to the room.

First, the first operation during the humidification operation will be described with reference to FIGS. 1 and 6. In the first operation, outdoor air (OA) as the second air is humidified in the first adsorption heat exchanger (61), and indoor air as the first air in the second adsorption heat exchanger (62). Water is collected from (RA). In the first operation, the four-way switching valve (64) of the refrigerant circuit (60) is switched to the state shown by the solid line in FIG. 1, and the first refrigeration cycle operation is performed.

In the first operation, by switching the dampers (71-78) of the openings (51-58), the first opening (51), the fourth opening (54), and the sixth opening (56) are switched. ) And the seventh opening (57) are in an open state, and the second opening (52), the third opening (53), the fifth opening (55), and the eighth opening (58) are in a closed state. Then, as shown in FIG. 6, outdoor air (OA) as the second air is supplied to the first adsorption heat exchanger (61), and the second adsorption heat exchanger (62) is supplied as the first air. Room air (RA) is supplied.

[0073] Specifically, the first air flowing from the indoor air suction port (22) flows from the second inflow path (45) to the second heat exchange chamber (42) through the sixth opening (56). Sent in. In the second heat exchange chamber (42), the first air passes through the second adsorption heat exchange (62) downward from above. In the second adsorption heat exchange (62), moisture in the first air is adsorbed by the adsorbent carried on the outer surface. The heat of adsorption generated at that time is absorbed by the refrigerant. Thereafter, the dehydrated first air passes through the fourth opening (54), the first outflow passage (44), and the exhaust fan (26) in that order, and as exhaust air (EA), the exhaust air outlet (23). From the room.

On the other hand, the second air that has flowed in from the outdoor air suction port (21) is sent from the first inflow path (43) to the first heat exchange chamber (41) through the first opening (51). In the first heat exchange chamber (41), the second air passes upward through the first adsorption heat exchanger (61). In the first adsorption heat exchanger (61), the adsorbent carried on the outer surface is heated by the refrigerant, and water is desorbed from the adsorbent. This adsorbent power The desorbed water passes through the first adsorption heat exchange (61) To be released into the second air. Thereafter, the humidified second air passes through the seventh opening (57), the second outflow channel (46), and the air supply fan (25) in this order, and is supplied from the air supply outlet (24) as supply air (SA). It is supplied to the room.

Next, the second operation during the humidification operation will be described with reference to FIGS. 1 and 7. In this second operation, outdoor air (OA) as the second air is humidified in the second adsorption heat exchange (62), and indoor air (the first air) as the first air in the first adsorption heat exchanger (61). Water is collected from RA). In the second operation, the four-way switching valve (64) of the refrigerant circuit (60) is switched to the state shown by the broken line in FIG. 1, and the second refrigeration cycle operation is performed.

In the second operation, by switching the dampers (71 to 78) of the respective openings (51 to 58), the second opening (52), the third opening (53), and the fifth opening (55) are switched. ) And the eighth opening (58) are in an open state, and the first opening (51), the fourth opening (54), the sixth opening (56), and the seventh opening (57) are in a closed state. Then, as shown in FIG. 7, the first adsorption heat exchanger (61) is supplied with room air (RA) as the first air, and the second adsorption heat exchanger (62) is supplied with the second air. Outdoor air (OA) is supplied.

Specifically, the first air flowing from the indoor air suction port (22) passes through the fifth opening (55) from the second inflow path (45) to the first heat exchange chamber (41). Sent in. In the first heat exchange chamber (41), the first air passes through the first adsorption heat exchanger (61) from top to bottom. In the first adsorption heat exchange (61), moisture in the first air is adsorbed by the adsorbent carried on the outer surface. The heat of adsorption generated at that time is absorbed by the refrigerant. Thereafter, the dehydrated first air passes through the third opening (53), the first outflow passage (44), and the exhaust fan (26) in that order, and as exhaust air (EA), the exhaust air outlet (23). From the room.

On the other hand, the second air flowing from the outdoor air suction port (21) is sent from the first inflow path (43) through the second opening (52) to the second heat exchange chamber (42). In the second heat exchange chamber (42), the second air passes upward through the second adsorption heat exchanger (62). In the second adsorption heat exchanger (62), the adsorbent carried on the outer surface is heated by the refrigerant, and moisture is desorbed from the adsorbent. The desorbed water is given to the second air passing through the second adsorption heat exchange (62). Thereafter, the humidified second air passes through the eighth opening (58), the second outflow passage (46), and the air supply fan (25) in this order, and is supplied from the air supply outlet (24) as supply air (SA). Room Supplied inside.

[0079] << Switching control of four-way switching valve (64) >>

Next, specific switching control of the four-way switching valve (64) will be described.

[0080] As described above, the first operation and the second operation are alternately switched during the dehumidifying operation, while the first operation and the second operation are alternately switched during the humidifying operation. This switching is performed by the circulation switching means (71), for example, by switching the four-way switching valve (64) every three minutes.

At the time of this switching, the compressor (63) is stopped for a predetermined time before the differential pressure reducing means (80) switches the four-way switching valve (64) of the circulation switching means (71), and the four-way switching valve ( After the switching of 64), the operation of the compressor (63) is restarted. When the compressor (63) is stopped by the differential pressure reducing means (80), the differential pressure between the high pressure side and the low pressure side of the refrigerant circuit (60) decreases, and the refrigerant instantaneously flows from the high pressure side to the low pressure side. Can be suppressed. As a result, the generation noise of the refrigerant at the time of switching is suppressed.

[0082] Effects of Embodiment 1

As described above, according to the present embodiment, before switching the refrigerant circulation, the differential pressure between the high pressure side and the low pressure side of the refrigerant circuit (60) is reduced, so that the refrigerant moves from the high pressure side to the low pressure side. An instantaneous flowing operation does not occur, and it is possible to prevent the noise generated by the accompanying refrigerant. In particular, even when the switching frequency is high, the sound of the refrigerant does not matter.

[0083] Further, since the compressor (63) is stopped before the four-way switching valve (64) is switched, it is necessary to reliably reduce the differential pressure between the high pressure side and the low pressure side of the refrigerant circuit (60). Therefore, it is possible to reliably prevent the noise generated by the refrigerant when switching.

Next, Embodiment 2 of the present invention will be described in detail.

[0085] In the present embodiment, the capacity of the compressor (63) is reduced instead of the differential pressure reducing means (80) of the first embodiment stopping the compressor (63). Things.

That is, in the present embodiment, the compressor (63) is configured such that the operating capacity is variable, and for example, the operating frequency is switched to a plurality of stages by the inverter. The differential pressure reducing means (80) reduces the operating frequency of the compressor (63) before switching the four-way switching valve (64), and reduces the operating frequency of the compressor (63) after switching the four-way switching valve (64). Return the operating frequency of) It is configured as follows.

[0087] Therefore, according to the present embodiment, since the operating frequency of the compressor (63) is reduced before the four-way switching valve (64) is switched, the high-pressure side and the low-pressure side of the refrigerant circuit (60) are reduced. Therefore, it is possible to prevent the noise generated by the refrigerant at the time of switching. Further, since the operation of the compressor (63) is continued, it is possible to suppress a decrease in humidity control ability. Other configurations, operations, and effects are the same as those of the first embodiment.

Next, Embodiment 3 of the present invention will be described in detail.

In the present embodiment, the opening of the expansion valve (65) is opened instead of the differential pressure reducing means (80) of the first embodiment stopping the compressor (63). Things.

That is, in the present embodiment, the expansion valve (65) is configured to have a variable opening, and for example, is configured such that the opening changes by a motorized valve in a plurality of stages. The differential pressure reducing means (80) increases the degree of opening of the expansion valve (65) before switching the four-way switching valve (64). The opening degree of the expansion valve (65) is returned after the switching of the valve (64).

Therefore, according to the present embodiment, the opening degree of the expansion valve (65) is increased before switching the four-way switching valve (64), so that the high pressure side and the low pressure side of the refrigerant circuit (60) are Can be reduced, so that the noise generated at the time of switching can be prevented. Further, since the operation of the compressor (63) is continued, it is possible to suppress a decrease in humidity control ability. Other configurations, operations, and effects are the same as those of the first embodiment.

Next, a fourth embodiment of the present invention will be described in detail with reference to the drawings.

[0093] In the present embodiment, as shown in Fig. 8, instead of the differential pressure reducing means (80) of Embodiment 1 stopping the compressor (63), the refrigerant is expanded by an expansion valve (65). ) Is bypassed.

That is, the differential pressure reducing means (80) of the present embodiment includes the bypass passage (81), the bypass valve (82), the flow controller (83), and the valve provided in the controller (70). Control means (84) is provided. [0095] Both ends of the bypass passage (81) are connected to both sides of the expansion valve (65), and the refrigerant bypasses the expansion valve (65) and the first adsorption heat exchange (61) and the second adsorption heat exchange (61). It is constructed so that it flows mutually with the translator (62).

[0096] The bypass valve (82) is a valve that switches between a fully open position and a fully closed position, performs binos of refrigerant, and is a normally closed valve that is fully closed during normal operation. .

[0097] The flow controller (83) constitutes a flow control mechanism such as a capillary tube, and is provided in series with the bypass valve (82). The flow regulator (83) is configured to regulate the refrigerant flowing through the bypass passage (81).

[0098] The valve control means (84) opens the bypass valve (82) before switching the four-way switching valve (64) and closes the bypass valve (82) after switching the four-way switching valve (64). Become composed! RU

[0099] Therefore, when the first operation and the second operation are alternately switched during the dehumidifying operation and the humidifying operation, before switching the four-way switching valve (64) of the circulation switching means (71), the valve control operation is performed. The stage (84) opens the bypass valve (82) and closes the bypass valve (82) after switching the four-way switching valve (64). Due to the opening of the bypass valve (82) by the valve control means (84), the differential pressure between the high pressure side and the low pressure side of the refrigerant circuit (60) is reduced, thereby suppressing the operation of the refrigerant flowing from the high pressure side to the low pressure side momentarily can do. As a result, the refrigerant generation noise at the time of switching is suppressed.

[0100] Further, according to the present embodiment, since the flow rate regulator (83) is provided in the bypass path (81), the high pressure side through the refrigerant gas bypass valve (82) when the no-pass valve (82) is opened. The operation in which the force also instantaneously flows to the low pressure side can be suppressed. As a result, the noise generated by the refrigerant due to the opening of the bypass valve (82) is suppressed. Other configurations, operations and effects are the same as those of the first embodiment.

[0101] In the present embodiment, the capillary tube is applied to the flow regulator (83), but a motorized valve or the like whose opening can be freely adjusted may be applied as a flow adjustment mechanism. At this time, the bypass valve (82) may be constituted by a valve whose opening degree is adjustable, and the bypass valve (82) may have a flow rate adjusting function as the flow rate regulator (83).

[0102] Further, in the present embodiment, the flow rate regulator (83) is provided in the bypass path (81), but the flow rate may be adjusted by the diameter of the bypass path (81) or the like. Controller (83) You may omit it.

Next, a fifth embodiment of the present invention will be described in detail with reference to the drawings.

In this embodiment, as shown in FIG. 9, instead of the refrigerant of Embodiment 4 bypassing the expansion valve (65), the refrigerant flows from the discharge side of the compressor (63) to the suction side. It is designed to be bypassed.

That is, the differential pressure reducing means (80) of the present embodiment is similar to the fourth embodiment in that the

81), a bypass valve (82) and a flow controller (83), and a valve control means (84) provided in the controller (70).

[0106] Both ends of the bypass passage (81) are connected to the discharge pipe (6d) and the suction pipe (6e) of the compressor (63) to connect the discharge side and the suction side of the compressor (63), The refrigerant is configured to flow from the discharge side of the compressor (63) to the suction side. The bypass valve (82), the flow regulator (83), and the valve control means (84) are the same as in the fourth embodiment.

[0107] Therefore, when the first operation and the second operation are alternately switched during the dehumidifying operation and the humidifying operation, before the four-way switching valve (64) of the circulation switching means (71) is switched, the valve control operation is performed. The stage (84) opens the bypass valve (82) and, after switching the four-way switching valve (64), the bypass valve (

Close 82). Since the refrigerant flows to the discharge side suction side of the compressor (63) by the opening of the bypass valve (82) by the valve control means (84), the differential pressure between the high pressure side and the low pressure side of the refrigerant circuit (60) is small. Thus, the operation in which the refrigerant instantaneously flows to the high pressure side and the low pressure side can be suppressed. As a result, the noise generated at the time of switching is suppressed.

Further, according to the present embodiment, when the bypass valve (82) is opened, the refrigerant momentarily flows from the high pressure side to the low pressure side via the bypass valve (82) by the flow controller (83). Can be suppressed. Refrigerant generation noise due to the opening of the noise valve (82) is suppressed.

[0109] In this embodiment, as in Embodiment 4, a bypass valve (82), which may be an electric valve whose degree of opening is adjustable as the flow rate adjusting mechanism (83), has a flow rate adjusting function. You may have it. Further, the flow rate may be adjusted by the diameter of the bypass passage (81) or the like. Other configurations, operations, and effects are the same as those of the fourth embodiment.

<Embodiment 6 of the Invention> Next, a sixth embodiment of the present invention will be described in detail with reference to the drawings.

In the present embodiment, as shown in FIG. 10, instead of the differential pressure reducing means (80) of the first embodiment stopping the compressor (63), the differential pressure reducing means (80) ) Is to reduce the refrigerant circulation amount.

That is, the differential pressure reducing means (80) of the present embodiment includes an on-off valve (85) provided in the suction pipe (6e) of the compressor (63), which is a gas pipe through which the gas refrigerant always flows. , Controller (70

) Is provided with the valve control means (84) provided in!).

[0113] The on-off valve (85) is a valve that switches between a fully open position and a fully closed position, and is provided between the second port of the four-way switching valve (64) and the suction port of the compressor (63). It is provided with a normally open valve that is fully opened during normal operation.

The valve control means (84) closes the on-off valve (85) before switching the four-way switching valve (64), and opens the on-off valve (85) after switching the four-way switching valve (64). It is composed into!

[0115] Therefore, when the first operation and the second operation are alternately switched during the dehumidifying operation and the humidifying operation, before the four-way switching valve (64) of the circulation switching means (71) is switched, the valve control operation is performed. The stage (84) closes the on-off valve (85) and opens the on-off valve (85) after switching the four-way switching valve (64). By closing the on-off valve (85) by the valve control means (84), the upstream side of the on-off valve (85) is maintained at a high pressure state.

That is, the discharge side force of the compressor (63), the four-way switching valve (64), the first adsorption heat exchanger (61)

The pressure up to the on-off valve (85) through the expansion valve (65) and the second adsorption heat exchanger (62) is maintained at a high pressure. Therefore, the differential pressure between the high pressure side and the low pressure side of the refrigerant circuit (60) becomes small, and the four-way switching valve (

At the time of the switching of (64), the operation in which the refrigerant instantaneously flows from the high pressure side to the low pressure side can be suppressed. As a result, the noise generated at the time of switching is suppressed.

[0117] Further, in the present embodiment, the refrigerant sucked into the compressor (63) is suppressed, so that the liquid back of the liquid refrigerant returning to the compressor (63) can be reliably prevented. Other configurations, operations, and effects are the same as those of the first embodiment.

In this embodiment, the on-off valve (85) is provided on the suction pipe (6e) of the compressor (63).

Instead of the on-off valve (85) of (6e), the on-off valve (85) of the discharge pipe (6d) of the compressor (63), which is a gas pipe through which the gas refrigerant always flows, as shown by the dashed line in FIG. May be provided! That is, the on-off valve (85) is provided between the compressor (63) and the first port of the four-way switching valve (64). In this case, when the on-off valve (85) is closed, the four-way switching valve (64), the first adsorption heat exchange (61), the expansion valve (65), and the second adsorption heat exchange (62) ) Is maintained at a low pressure up to the suction side of the compressor (63).

[0120] Further, the on-off valve (85) is not limited to the case where it is fully closed, and the opening degree may be reduced to reduce the refrigerant circulation amount.

[0121] In the present embodiment, the differential pressure reducing means (80) of the second embodiment or the like is used together.

The present invention may be configured as follows in each of the above embodiments.

Although the switching mechanism (64) in each of the above embodiments is a four-way switching valve (64), the switching direction of the refrigerant may be switched by a bridge circuit and four valves provided in the bridge circuit. No. Also in this case, it is possible to reduce the noise generated by the refrigerant when the refrigerant circulation direction is switched by opening and closing the valve.

[0124] Further, the differential pressure reducing means (80) is configured to return the compressor (63) or the like after the switching of the switching mechanism (64). The return of (82) may be performed immediately before the switching of the shelf structure (64). In short, it is sufficient if the refrigerant pressure state is such that the generation of refrigerant at the time of switching can be suppressed.

Industrial applicability

[0125] As described above, the present invention is useful for a humidity control apparatus that performs adsorption and desorption of moisture by switching the refrigerant circulation direction, and in particular, a control apparatus that has heat exchange with an adsorbent carried thereon. Suitable for wet equipment.

Claims

The scope of the claims

[1] The compressor (63), the cutting structure (64), the first heat exchange (61), the expansion mechanism (65), and the second heat exchange (62) are connected to form a reversible refrigerant circulation, Equipped with a refrigerant circuit (60) for performing a compression refrigeration cycle,

A humidity control device in which an adsorbent for adsorbing and desorbing moisture is carried on surfaces of the first heat exchanger (61) and the second heat exchanger (62),

In order to alternately adsorb and desorb moisture in the first heat exchange (61) and the second heat exchange (62), the switching mechanism (64) is switched to circulate the refrigerant in the refrigerant circuit (60). Circulation switching means (71) for switching directions,

Before the circulation switching of the circulation switching means (71), a differential pressure reducing means (80) for reducing the differential pressure between the high pressure side and the low pressure side of the refrigerant circuit (60) is provided.

A humidity control device characterized by that:

[2] In claim 1,

The differential pressure reducing means (80) is configured to stop the compressor (63).

[3] In claim 1,

The compressor (63) is configured to have a variable capacity,

The differential pressure reducing means (80) is configured to reduce the operating capacity of the compressor (63).

A humidity control device characterized by that:

[4] In claim 1,

The expansion mechanism (65) is configured by an expansion valve having a variable opening,

The humidity control apparatus, wherein the differential pressure reducing means (80) is configured to open the opening of the expansion valve.

[5] In claim 1,

The differential pressure reducing means (80) includes a bypass passage (81) that bypasses the expansion mechanism (65), and a normally closed bypass valve (82) provided in the bypass passage (81). It is configured to open the bypass valve (82) before switching the circulation of (71)! , A humidity control device characterized by that:

[6] In claim 1,

The differential pressure reducing means (80) includes a bypass passage (81) connecting the discharge side and the suction side of the compressor (63), and a normally closed bypass valve (82) provided in the bypass passage (81). A humidity control device comprising: a bypass valve (82) opened before the circulation switching of the circulation switching means (71).

[7] In claim 5 or 6,

The differential pressure reducing means (80) includes a flow rate adjusting mechanism (83) provided in the bypass passage (81).

A humidity control device characterized by that:

[8] In claim 1,

The differential pressure reducing means (80) includes a normally open on-off valve (85) provided in a gas pipe (6b, 6c) connected to the compressor (63) and through which gas refrigerant flows constantly, and a circulation switching means ( The on-off valve (85) is configured to be closed before the circulation switch of (71).

A humidity control device characterized by that:

Shuffle paper (Rule 26)