JP2010281502A - Humidifier - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a humidifier for securely humidifying outside air and supplying the air into a room under a low outside air condition. <P>SOLUTION: The humidifier 10 includes a bypass passage 81 formed in a casing 11 so that the outside air taken into the casing 11 bypasses adsorption heat exchangers 51, 52 to be fed into the room, and a bypass amount variable mechanism 83 for changing an amount of air flowing in the bypass passage 81. During the humidifying operation, the humidifier carries out normal operation for passing all the outside air taken into the casing 11 through the adsorption heat exchangers 51, 52 on the heating side to supply the air inside the room and bypass operation for passing a part of the outside air taken into the casing 11 through the adsorption heat exchangers 51, 52 on the heating side to supply the air inside the room while supplying the rest of the outside air into the room via the bypass passage 81 so as to switch the operations to each other. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a humidity control apparatus that adjusts indoor humidity, and particularly relates to a humidity control apparatus that includes a refrigerant circuit having an adsorption heat exchanger and performs a humidification operation in which air is humidified by the adsorption heat exchanger.

  Conventionally, a humidity control device that adjusts the humidity of air is known. As this type of humidity control apparatus, Patent Document 1 discloses an apparatus for conditioning air using an adsorption heat exchanger carrying an adsorbent.

  The humidity control apparatus of Patent Document 1 has a refrigerant circuit in which a refrigerant circulates and a refrigeration cycle is performed. A compressor, a first adsorption heat exchanger, a second adsorption heat exchanger, an expansion valve, and a four-way switching valve are connected to the refrigerant circuit. The compressor is provided in a predetermined storage chamber in the casing. Moreover, the 1st adsorption heat exchanger and the 2nd adsorption heat exchanger are each provided in the 1st heat exchanger chamber and the 2nd adsorption heat exchanger chamber in a casing.

  In the refrigerant circuit, the circulation direction of the refrigerant can be switched reversibly according to the setting of the four-way switching valve. Specifically, in the refrigerant circuit, the setting of the four-way switching valve is switched every predetermined time, so that the high pressure refrigerant flows through the first adsorption heat exchanger and the low pressure refrigerant flows through the second adsorption heat exchanger. And the operation in which the low-pressure refrigerant flows through the first adsorption heat exchanger and the high-pressure refrigerant flows through the second adsorption heat exchanger are alternately performed.

  In the adsorption heat exchanger (evaporator) through which the low-pressure refrigerant flows, the adsorbent is cooled by the refrigerant, and moisture in the air is adsorbed by the adsorbent. In the adsorption heat exchanger (condenser or radiator) through which the high-pressure refrigerant flows, the adsorbent is heated by the refrigerant, and moisture is desorbed from the adsorbent and applied to the air. As described above, in each adsorption heat exchanger, the operation of adsorbing moisture (adsorption operation) and the operation of desorbing moisture (regeneration operation) are alternately performed with the switching of the four-way switching valve.

  In the humidifying operation of the humidity control apparatus, outdoor air and indoor air are taken into the casing. The room air taken in the casing is sent to the adsorption heat exchanger on the side cooled by the low-pressure refrigerant. In this cooling-side adsorption heat exchanger, moisture in the air is adsorbed by the adsorbent by the above-described adsorption operation. The outdoor air taken in the casing is sent to the adsorption heat exchanger on the side heated by the high-pressure refrigerant. In the adsorption heat exchanger on the heating side, moisture desorbed from the adsorbent by the above regeneration operation is imparted to the air. The air to which moisture has been applied as described above is supplied indoors. Thereby, indoor humidification is performed.

  During the humidification operation, in accordance with the switching between the first operation and the second operation, the air flow is such that the outdoor air flows through the heating-side adsorption heat exchanger and the indoor air flows through the cooling-side adsorption heat exchanger. The path is switched by a damper. Thereby, in the humidification operation of the humidity control apparatus of Patent Document 1, outdoor air is continuously humidified and supplied indoors.

JP 2005-291532 A

  In the humidity control apparatus disclosed in Patent Document 1, outdoor air is passed through a heating-side adsorption heat exchanger to humidify the air. However, when such humidification operation is performed in winter, for example in a cold region, outdoor air having an extremely low temperature may flow through the adsorption heat exchanger on the heating side. For this reason, in the adsorption heat exchanger on the heating side, the adsorbent cannot be heated to a sufficient temperature by the high-pressure refrigerant, which may significantly reduce the amount of water released from the adsorbent.

  As described above, in the humidity control apparatus disclosed in Patent Document 1, the amount of moisture released from the adsorbent of the adsorption heat exchanger on the heating side is significantly reduced by the temperature of the outdoor air being extremely low. As a result, the humidification performance is impaired.

  This invention is made | formed in view of this point, The objective is to provide the humidity control apparatus which can humidify outdoor air reliably and can supply it indoors also under low external air conditions.

  The first invention has a casing (11), a compressor (53), and two adsorption heat exchangers (51, 52), and the adsorbent of one adsorption heat exchanger (51, 52) is used as a high-pressure refrigerant. And a refrigerant circuit (50) in which a refrigeration cycle for cooling the adsorbent of the other adsorption heat exchanger (51, 52) with a low-pressure refrigerant is performed at the same time as taking in outdoor air into the casing (11), The taken outdoor air is passed through the heating-side adsorption heat exchanger (51, 52) and supplied to the room. At the same time, the room air is taken into the casing (11), and the taken-in room air is exchanged for the cooling-side adsorption heat. The humidity control device that performs the humidifying operation that passes through the chambers (51, 52) and discharges it outside the room is the target. And this humidity control apparatus is formed in this casing (11) so that the outdoor air taken in in the said casing (11) bypasses the said adsorption heat exchanger (51,52), and is sent indoors or outdoors. A bypass passage (81), a bypass amount variable mechanism (83) for changing the amount of air flowing through the bypass passage (81), and outdoor air taken into the casing (11) during the humidification operation. All of the normal operation of passing through the heating-side adsorption heat exchanger (51, 52) and supplying it to the room, and a part of the outdoor air taken into the casing (11) are converted into the heating-side adsorption heat exchanger (51 , 52) for controlling the bypass amount variable mechanism (83) so as to switch between bypass operation for supplying the remaining outdoor air to the room through the bypass passage (81) and supplying it to the room at the same time. Department (100) and I am characterized in.

  In the humidity control apparatus of the first invention, in the refrigerant circuit (50) during the humidifying operation, the refrigerant discharged from the compressor (53) circulates to perform a refrigeration cycle. That is, the refrigerant compressed by the compressor (53) flows through the one adsorption heat exchanger (51, 52) as a high-pressure refrigerant and dissipates heat. The refrigerant after heat dissipation is decompressed by a decompression mechanism or the like, and then flows through the other adsorption heat exchanger (51, 52) as a low-pressure refrigerant and evaporates. The evaporated refrigerant is sucked into the compressor (53) and compressed.

  At the same time, in the humidifying operation, both indoor air and outdoor air are taken into the casing (11). The room air taken into the casing (11) flows through the adsorption heat exchanger (51, 52) on the cooling side (evaporator side) cooled by the low-pressure refrigerant. In the cooling-side adsorption heat exchanger (51, 52), moisture in the air is adsorbed by the adsorbent. The adsorption heat of the adsorbent is used for evaporation of the refrigerant. As described above, the air in which moisture is given to the adsorbent of the adsorption heat exchanger (51, 52) on the cooling side is discharged to the outside.

  On the other hand, the outdoor air taken into the casing (11) flows through the adsorption heat exchanger (51, 52) on the heating side (condenser side) heated by the high-pressure refrigerant. In the heating-side adsorption heat exchanger (51, 52), the adsorbent is heated to a predetermined temperature, whereby moisture in the adsorbent is released into the air. As described above, the air humidified by the adsorption heat exchanger (51, 52) on the heating side is supplied indoors.

  In the humidity control apparatus of the present invention, during the humidification operation as described above, the control unit (100) controls the bypass amount variable mechanism (83), so that the normal operation and the bypass operation can be switched. In normal operation, the entire amount of outdoor air taken into the casing (11) flows through the adsorption heat exchanger (51, 52) on the heating side. That is, in this normal operation, the entire amount of outdoor air taken in is humidified and supplied to the room.

  By the way, it is assumed that the normal operation of the humidifying operation is performed under the condition that the temperature of the outdoor air is extremely low. In this case, the adsorption heat exchanger (51, 52) on the heating side is cooled by the outdoor air, so that the condensation temperature of the refrigerant flowing through the adsorption heat exchanger (51, 52) is lowered, and further the cooling side The evaporating temperature of the refrigerant flowing through the adsorption heat exchanger (51, 52) also decreases. As a result, the temperature of the adsorbent in the adsorption heat exchanger (51, 52) on the heating side cannot be raised to a desired temperature by the refrigerant, which may reduce the amount of moisture released from the adsorbent. There is.

  Therefore, in the humidity control apparatus of the present invention, in order to eliminate such problems, a bypass operation can be performed during the humidifying operation. In this bypass operation, only a part of the outdoor air taken into the casing (11) flows through the adsorption heat exchanger (51, 52) on the heating side, and the remaining air is sent indoors or outdoors through the bypass passage (81). It is done. Thereby, in the heating-side adsorption heat exchanger (51, 52), the refrigerant condensing temperature can be increased, so that a decrease in temperature of the adsorbent can be prevented. Therefore, by performing such a bypass operation, the temperature of the adsorbent of the adsorption heat exchanger (51, 52) on the heating side can be raised to a desired temperature even under conditions where the outdoor air temperature is extremely low. Can do. As a result, a sufficient amount of water released from the adsorbent can be secured.

  In a second aspect based on the first aspect, the bypass passage (81) is formed in the casing (11) so that outdoor air is sent into the room by bypassing the adsorption heat exchanger (51, 52). It is characterized by being.

  In the second invention, in the above bypass operation, a part of the outdoor air taken into the casing (11) is humidified by the heating-side adsorption heat exchanger (51, 52) and supplied to the room, The remaining air that bypasses the adsorption heat exchanger (51, 52) on the heating side is also supplied to the room. That is, in the present invention, all of the outdoor air taken into the casing (11) is finally supplied indoors.

  According to a third invention, in the first or second invention, an outside air temperature detection unit (101) for detecting the temperature of outdoor air is provided, and the control unit (100) is configured to perform the outside air temperature in the humidification operation. When the outdoor air temperature detected by the detection unit (101) becomes lower than a predetermined temperature, the bypass amount variable mechanism (83) is controlled to perform the bypass operation.

  In the humidity control apparatus according to the third aspect of the invention, in the humidifying operation, the outside air temperature detector (101) detects the temperature of the outdoor air. Here, when the detected outside air temperature is relatively low, it is assumed that the temperature of the adsorbent of the adsorption heat exchanger (51, 52) on the heating side cannot be sufficiently increased, and the regeneration efficiency of the adsorbent is reduced. Is done. Therefore, in the present invention, when the outside air temperature detected by the outside air temperature detection unit (101) becomes lower than a predetermined temperature, the above bypass operation is performed. As a result, the amount of water released from the adsorbent of the adsorption heat exchanger (51, 52) on the heating side is avoided in advance.

  According to a fourth invention, in the first or second invention, a condensing temperature detecting unit (51a, 52a) for detecting a condensing temperature of the high-pressure refrigerant in the refrigerant circuit (50) is provided, and the control unit (100) In the humidification operation, when the condensation temperature detected by the condensation temperature detector (51a, 52a) becomes lower than a predetermined temperature, the bypass amount variable mechanism (83) is controlled to perform the bypass operation. Features.

  In 4th invention, a condensation temperature detection part (51a, 52a) detects the condensation temperature of the high pressure refrigerant | coolant of a refrigerant circuit (50) in humidification driving | operation. That is, the condensation temperature detector (51a, 52a) detects the temperature of the refrigerant condensed in the heating-side adsorption heat exchanger (51, 52). The condensing temperature detector (51a, 52a) does not necessarily detect the condensing temperature by directly detecting the temperature of the refrigerant. For example, the condensing temperature detecting unit indirectly obtains the condensing temperature from the pressure of the high-pressure refrigerant. It may be. Here, when the detected condensing temperature is relatively low, it is assumed that the temperature of the adsorbent of the adsorption heat exchanger (51, 52) on the heating side cannot be sufficiently increased, and the regeneration efficiency of the adsorbent is reduced. Is done. Therefore, in the present invention, when the refrigerant condensing temperature detected by the condensing temperature detector (51a, 52a) becomes lower than a predetermined temperature, a bypass operation is performed. As a result, the amount of water released from the adsorbent of the adsorption heat exchanger (51, 52) on the heating side is avoided in advance.

  According to the present invention, during the humidifying operation, only a part of the outdoor air taken into the casing (11) is sent to the heating-side adsorption heat exchanger (51, 52), and the remaining air is heated to the heating-side adsorption heat. It is possible to execute a bypass operation for bypassing the exchanger (51, 52) and sending it indoors or outdoors. For this reason, it is possible to avoid that the temperature of the adsorbent of the adsorption heat exchanger (51, 52) on the heating side cannot be sufficiently raised under conditions where the temperature of the outdoor air is extremely low. A sufficient amount of water is released from the adsorbent of the vessel (51, 52). Therefore, it is possible to prevent the humidity control capability of the humidity control device from being significantly reduced under such low outside air conditions, and to ensure the reliability of the humidity control device. That is, in the humidifying operation of this humidity control apparatus, the amount of latent heat that can be processed can be increased, so that humidity control can be performed with a relatively low sensible heat ratio (sensible heat amount / total heat amount).

  Also, if the adsorption heat exchanger (51, 52) on the heating side is extremely cooled by the outdoor air under such low outside air conditions, the refrigerant flowing through the adsorption heat exchanger (51, 52) is condensed. At the same time as the temperature decreases, the evaporation temperature of the refrigerant flowing in the adsorption heat exchanger (51, 52) on the cooling side (evaporator) side also decreases. As a result, the adsorbent of the cooling-side adsorption heat exchanger (51, 52) freezes or a large amount of condensed water occurs.

  However, such a problem can be avoided by performing the bypass operation of the present invention. Specifically, by reducing the amount of outdoor air sent to the heating-side adsorption heat exchanger (51, 52) by bypass operation, the condensation temperature of the refrigerant flowing through the heating-side adsorption heat exchanger (51, 52) can be reduced. As a result, the evaporation temperature of the refrigerant flowing through the adsorption heat exchanger (51, 52) on the cooling side (evaporator side) can be increased. As a result, it is possible to avoid freezing of the adsorbent in the cooling-side adsorption heat exchanger (51, 52) and generation of condensed water near the cooling-side adsorption heat exchanger (51, 52).

  Further, according to the second aspect of the invention, outdoor air bypassing the adsorption heat exchanger (51, 52) on the heating side is supplied to the room during the bypass operation. For this reason, in the bypass operation, the amount of air taken into the casing (11) from the room and discharged outside the room (exhaust amount) is taken into the casing (11) from the outside and supplied into the room. It is possible to avoid a relatively small amount of air (amount of air supply). Therefore, in the bypass operation, not only the humidifying performance by the humidity control device but also the indoor ventilation performance can be sufficiently secured.

  In the third invention, the bypass operation is performed when the temperature detected by the outside air temperature detection unit (101) is lower than a predetermined temperature. Therefore, since the bypass operation can be performed reliably under low outdoor air conditions, it is possible to reliably avoid a decrease in humidification performance due to a decrease in outdoor air temperature.

  In the fourth aspect of the invention, the bypass temperature is performed when the temperature detected by the condensing temperature detector (51a, 52a) is lower than a predetermined temperature. Therefore, it is possible to reliably avoid a decrease in humidification performance due to a decrease in the condensation temperature of the high-pressure refrigerant.

FIG. 1 is a perspective view showing a humidity control apparatus viewed from the front side, with a part of a casing and an electrical component box omitted. FIG. 2 is a schematic plan view, a right side view, and a left side view in which a part of the humidity control apparatus is omitted. FIG. 3 is a piping system diagram showing the configuration of the refrigerant circuit, in which (A) shows the first operation and (B) shows the second operation. FIG. 4 is a configuration diagram schematically showing the overall configuration of the air conditioning system of the embodiment, and shows the air flow of the bypass operation during the humidifying operation. FIG. 5 is a schematic plan view, right side view, and left side view of the humidity control apparatus showing the air flow in the first operation of the dehumidifying ventilation operation. FIG. 6 is a schematic plan view, a right side view, and a left side view of the humidity control apparatus showing the air flow in the second operation of the dehumidifying ventilation operation. FIG. 7 is a schematic plan view, a right side view, and a left side view of the humidity control apparatus showing the air flow in the first operation of the humidification ventilation operation. FIG. 8 is a schematic plan view, right side view, and left side view of the humidity control apparatus showing the air flow in the second operation of the humidification ventilation operation. FIG. 9 is a schematic plan view, right side view, and left side view of the humidity control apparatus showing the air flow in the simple ventilation operation. FIG. 10 is a graph showing the relationship between the bypass rate and the condensation / evaporation temperature of the refrigerant. FIG. 11 is a graph showing the relationship between the bypass rate and the amount of water released from the adsorbent. FIG. 12 is a configuration diagram schematically showing the overall configuration of the air conditioning system of Modification 1, and shows the air flow of the bypass operation during the humidifying operation. FIG. 13 is a configuration diagram schematically showing the overall configuration of the air conditioning system of Modification 2, and shows the air flow of the bypass operation during the humidifying operation. FIG. 14 is a configuration diagram schematically showing the overall configuration of the air conditioning system of Modification 3, and shows the air flow of the bypass operation during the humidifying operation. FIG. 15 is a piping system diagram showing a configuration of a refrigerant circuit for an air conditioning system according to another embodiment.

  The humidity control apparatus (10) of this embodiment adjusts the humidity of the taken outdoor air (OA) and supplies it to the room. The humidity controller (10) ventilates the room by supplying the outdoor air (OA) to the room and simultaneously discharging the room air (RA) to the outside. The humidity control device (10) is included in an air conditioning system (110), which will be described in detail later, and is configured to adjust the humidity in the room air-conditioned by the air conditioner (120).

<Overall configuration of humidity control device>
First, the humidity control apparatus (10) will be described with reference to FIGS. Note that “upper”, “lower”, “left”, “right”, “front”, “rear”, “front”, and “rear” used in the description here are the humidity control device (10) from the front side unless otherwise stated. It means the direction when viewed.

  The humidity control device (10) includes a casing (11). A refrigerant circuit (50) is accommodated in the casing (11). The refrigerant circuit (50) includes a first adsorption heat exchanger (51), a second adsorption heat exchanger (52), a compressor (53), a four-way switching valve (54), and an electric expansion valve (55). It is connected. Details of the refrigerant circuit (50) will be described later.

  The casing (11) is formed in a rectangular parallelepiped shape that is slightly flat and relatively low in height. In the casing (11) shown in FIG. 1, the left front side (ie, front) is the front panel (12), and the right back side (ie, back) is the back panel (13). Is the first side panel (14), and the left back side is the second side panel (15).

  The casing (11) is formed with an outside air suction port (24), an inside air suction port (23), an air supply port (22), and an exhaust port (21). The outside air inlet (24) and the inside air inlet (23) are open to the back panel (13). The outside air inlet (24) is disposed in the lower part of the back panel (13). The inside air suction port (23) is arranged in the upper part of the back panel (13). The air supply port (22) is disposed near the end of the first side panel (14) on the front panel (12) side. The exhaust port (21) is disposed near the end of the second side panel (15) on the front panel (12) side.

  The internal space of the casing (11) includes an upstream divider plate (71), a downstream divider plate (72), a central divider plate (73), a first divider plate (74), and a second divider plate ( 75). These partition plates (71 to 75) are all erected on the bottom plate of the casing (11), and divide the internal space of the casing (11) from the bottom plate of the casing (11) to the top plate. .

  The upstream divider plate (71) and the downstream divider plate (72) are parallel to the front panel portion (12) and the rear panel portion (13), and are spaced at a predetermined interval in the longitudinal direction of the casing (11). Has been placed. The upstream divider plate (71) is disposed closer to the rear panel portion (13). The downstream partition plate (72) is disposed closer to the front panel portion (12).

  The first partition plate (74) and the second partition plate (75) are installed in a posture parallel to the first side panel portion (14) and the second side panel portion (15). The first partition plate (74) is spaced a predetermined distance from the first side panel (14) so as to close the space between the upstream partition plate (71) and the downstream partition plate (72) from the right side. Has been placed. The second partition plate (75) is spaced from the second side panel (15) by a predetermined distance so as to close the space between the upstream partition plate (71) and the downstream partition plate (72) from the left side. Has been placed.

  The central partition plate (73) is disposed between the upstream partition plate (71) and the downstream partition plate (72) in a posture orthogonal to the upstream partition plate (71) and the downstream partition plate (72). Yes. The central partition plate (73) is provided from the upstream partition plate (71) to the downstream partition plate (72), and the space between the upstream partition plate (71) and the downstream partition plate (72) is left and right. It is divided into.

  In the casing (11), the space between the upstream divider plate (71) and the back panel (13) is divided into two upper and lower spaces, and the lower space constitutes the outside air intake passage (34). The upper space constitutes the inside air suction passage (32). The outside air suction passage (34) communicates with the outside air suction port (24), and the inside air suction passage (32) communicates with the inside air suction port (23). An outside air filter (28) and an outside air humidity sensor (97) are installed in the outside air suction passage (34). An inside air filter (27) and an inside air humidity sensor (96) are installed in the inside air suction passage (32).

  The space between the upstream divider plate (71) and the downstream divider plate (72) in the casing (11) is divided into left and right by the central divider plate (73), and is located on the right side of the central divider plate (73). The space constitutes the first heat exchanger chamber (37), and the space on the left side of the central partition plate (73) constitutes the second heat exchanger chamber (38). A first adsorption heat exchanger (51) is accommodated in the first heat exchanger chamber (37). The second adsorption heat exchanger (52) is accommodated in the second heat exchanger chamber (38). Moreover, although not shown in figure, the electric expansion valve (55) of a refrigerant circuit (50) is accommodated in the 1st heat exchanger chamber (37).

  Each adsorption heat exchanger (51, 52) has an adsorbent supported on the surface of a so-called cross fin type fin-and-tube heat exchanger, and is a rectangular thick plate or flat rectangular parallelepiped as a whole. It is formed in a shape. Each adsorption heat exchanger (51, 52) is placed in the heat exchanger chamber (37, 38) with its front and back surfaces parallel to the upstream partition plate (71) and downstream partition plate (72). It is erected. Each adsorption heat exchanger (51, 52) constitutes an adsorption member that performs an adsorption operation for adsorbing moisture in the air and a regeneration operation (desorption operation) for releasing the adsorbed moisture into the air.

  In the internal space of the casing (11), the space along the front surface of the downstream partition plate (72) is partitioned vertically, and the upper portion of the vertically partitioned space is the air supply side passage ( 31), and the lower part constitutes the exhaust side passage (33).

  The upstream partition plate (71) is provided with four open / close dampers (41 to 44). Each damper (41-44) is formed in the shape of a substantially horizontally long rectangle. Specifically, in a portion (upper portion) facing the inside air suction passage (32) of the upstream side partition plate (71), the first inside air damper (41) is attached to the right side of the central partition plate (73). The second inside air damper (42) is attached to the left side of the central partition plate (73). Moreover, in the part (lower part) which faces an external air suction channel | path (34) among upstream side partition plates (71), the 1st external air side damper (43) is attached to the right side rather than a center partition plate (73), A second outside air damper (44) is attached to the left side of the central partition plate (73).

  The downstream partition plate (72) is provided with four open / close dampers (45 to 48). Each damper (45-48) is formed in the shape of a substantially horizontally long rectangle. Specifically, in the part (upper part) facing the supply side passageway (31) in the downstream partition plate (72), the first supply side damper (45) is located on the right side of the central partition plate (73). The second air supply side damper (46) is attached to the left side of the central partition plate (73). Moreover, in the part (lower part) which faces an exhaust side channel | path (33) among downstream partition plates (72), the 1st exhaust side damper (47) is attached to the right side rather than a center partition plate (73), A second exhaust side damper (48) is attached to the left side of the central partition plate (73).

  In the casing (11), the space between the air supply side passage (31) and the exhaust side passage (33) and the front panel portion (12) is divided into left and right by the partition plate (77). The space on the right side of (77) constitutes the air supply fan chamber (36), and the space on the left side of the partition plate (77) constitutes the exhaust fan chamber (35).

  The air supply fan (26) is accommodated in the air supply fan chamber (36). The exhaust fan chamber (35) accommodates an exhaust fan (25). The supply fan (26) and the exhaust fan (25) are both centrifugal multiblade fans (so-called sirocco fans). The air supply fan (26) blows out the air sucked from the downstream side partition plate (72) side to the air supply port (22). The exhaust fan (25) blows out the air sucked from the downstream partition plate (72) side to the exhaust port (21).

  The supply fan chamber (36) accommodates the compressor (53) and the four-way switching valve (54) of the refrigerant circuit (50). The compressor (53) and the four-way selector valve (54) are disposed between the air supply fan (26) and the partition plate (77) in the air supply fan chamber (36).

  The compressor (53) is composed of an inverter type compressor in which the rotation speed of the compressor motor is variable (that is, the capacity is variable). The compressor (53) is a scroll type compressor in which the fixed scroll and the movable scroll are meshed with each other, and the movable scroll eccentrically rotates with respect to the fixed scroll to compress the refrigerant. The compressor (53) basically has a predetermined differential pressure (so-called high / low differential pressure) between the low pressure (evaporation pressure) and the high pressure (condensation pressure) of the refrigerant circuit (50) in the operation operation described later. The operating frequency of the compressor (53) is controlled such that

  In the casing (11), the space between the first partition (74) and the first side panel (14) forms a first bypass passage (81). The starting end of the first bypass passage (81) communicates only with the outside air suction passage (34) and is blocked from the inside air suction passage (32). The terminal end of the first bypass passage (81) is partitioned by the partition plate (78) from the air supply side passage (31), the exhaust side passage (33), and the air supply fan chamber (36). A first bypass damper (83) is provided in a portion of the partition plate (78) facing the supply fan chamber (36).

  When the first bypass damper (83) is in the open state, the terminal end of the first bypass passage (81) and the supply side passage (31) communicate with each other. That is, the first bypass passage (81) allows the outside air suction passage (34) and the air supply side passage (31) to communicate with each other. The first bypass passage (81) constitutes a bypass passage according to the present invention for the outdoor air taken into the casing (11) to bypass each adsorption heat exchanger (51, 52) and send it indoors. Yes. The first bypass damper (83) is configured so that the opening degree can be changed in multiple stages, and constitutes a bypass amount variable mechanism for changing the amount of air flowing through the first bypass passage (81). . Furthermore, the humidity control apparatus (10) has a control unit (100) that controls the opening degree of the first bypass damper (83) (see FIG. 4).

  In the casing (11), the space between the second partition (75) and the second side panel (15) constitutes a second bypass passage (82). The starting end of the second bypass passage (82) communicates only with the inside air suction passage (32) and is blocked from the outside air suction passage (34). The terminal end of the second bypass passage (82) is partitioned by the partition plate (79) from the air supply side passage (31), the exhaust side passage (33), and the exhaust fan chamber (35). A second bypass damper (84) is provided in a portion of the partition plate (79) facing the exhaust fan chamber (35).

<Configuration of refrigerant circuit>
As shown in FIG. 3, the refrigerant circuit (50) includes a first adsorption heat exchanger (51), a second adsorption heat exchanger (52), a compressor (53), a four-way switching valve (54), and an electric expansion. It is a closed circuit provided with a valve (55). The refrigerant circuit (50) performs a vapor compression refrigeration cycle by circulating the filled refrigerant.

  In the refrigerant circuit (50), the compressor (53) has its discharge side connected to the first port of the four-way switching valve (54) and its suction side connected to the second port of the four-way switching valve (54). . In the refrigerant circuit (50), the first adsorption heat exchanger (51), the electric expansion valve (55), and the second adsorption heat exchanger (52) are connected from the third port of the four-way switching valve (54). They are connected in order toward the fourth port.

  The four-way switching valve (54) includes a first state (state shown in FIG. 3A) in which the first port and the third port communicate with each other, and the second port and the fourth port communicate with each other. The second port and the fourth port can communicate with each other, and the second port and the third port can communicate with each other in the second state (the state shown in FIG. 3B). In accordance with the switching of the setting of the four-way switching valve (54), the refrigerant circulation direction in the refrigerant circuit (50) is reversed. That is, the four-way selector valve (54) constitutes a refrigerant flow path switching mechanism that reversibly switches the refrigerant circulation direction. In the refrigerant circuit (50), the high pressure refrigerant flows through the first adsorption heat exchanger (51) and the low pressure refrigerant flows through the second adsorption heat exchanger (52) in accordance with the switching of the four-way switching valve (54). The operation and the operation in which the low-pressure refrigerant flows through the first adsorption heat exchanger (51) and the high-pressure refrigerant flows through the second adsorption heat exchanger (52) are alternately performed.

<Overall configuration of air conditioning system>
As schematically shown in FIG. 4, the air conditioning system (110) includes the humidity control device (10) and the air conditioner (120). In the air conditioning system (110), the humidity control device (10) and the air conditioner (120) target the same indoor space (S).

  The humidity control device (10) is provided, for example, behind the ceiling of the indoor space (S). The air conditioning system (110) includes an outside air suction duct (111), an inside air suction duct (112), an air supply duct (113), and an exhaust duct (114). The outside air suction duct (111) has one end connected to the outside air suction port (24) and the other end communicating with the outdoor. The inside air suction duct (112) has one end connected to the inside air inlet (23) and the other end communicating with the indoor space (S). The air supply duct (113) has one end connected to the air supply port (22) and the other end communicating with the indoor space (S). The exhaust duct (114) has one end connected to the exhaust port (21) and the other end communicating with the outside.

  The humidity control device (10) includes a control unit (100) and an outside air temperature sensor (101). The controller (100) constitutes a control means for adjusting the opening degree (that is, the damper angle) of the second bypass damper (84). The outside air temperature sensor (101) is disposed, for example, inside the outside air suction duct (111). The outside temperature sensor (101) constitutes an outside temperature detector for detecting the temperature of the outdoor air (OA). Note that the outside air temperature sensor (101) may be disposed outside the outside air suction passage (34) or outdoors.

  The air conditioner (120) cools and heats the indoor space (S). The air conditioner (120) is configured, for example, as a ceiling-embedded type. The air conditioner (120) includes an indoor heat exchanger (121) in its casing. The indoor heat exchanger (121) is connected to a refrigerant circuit (not shown) in which a refrigeration cycle is performed. In the indoor heat exchanger (121), the air is cooled or heated by heat exchange between the refrigerant and the air.

-Driving action-
The operation of the air conditioning system (110) will be described. In the air conditioning system (110), the air conditioner (120) and the humidity control device (10) can be operated simultaneously. The air conditioner (120) switches between a cooling operation and a heating operation. That is, in the cooling operation of the air conditioner (120), the indoor heat exchanger (121) serves as an evaporator, and the indoor air is cooled by the indoor heat exchanger (121). In the heating operation of the air conditioner (120), the indoor heat exchanger (121) serves as a condenser, and the indoor air is heated by the indoor heat exchanger (121).

  Further, the humidity control device (10) switches between a dehumidifying operation, a humidifying operation, and a simple ventilation operation. Further, in the humidifying operation of the humidity control apparatus (10), two types of operations, a normal operation and a bypass operation, can be performed. Below, each operation | movement of a humidity control apparatus (10) is demonstrated in detail.

<Dehumidifying operation>
In the dehumidifying operation of the present embodiment, the outdoor air (OA) is dehumidified, and the air after dehumidification is supplied to the room as supply air (SA), and at the same time, the room air (RA) is discharged to the outside as discharge air (EA). . That is, in the dehumidifying operation, indoor dehumidification and indoor ventilation are performed simultaneously.

  In the dehumidifying operation, the supply fan (26) and the exhaust fan (25) are in operation. Further, in the dehumidifying operation, a first operation and a second operation described later are alternately repeated by switching the open / closed states of the plurality of dampers. The first operation and the second operation are switched every predetermined set time (for example, 3 minutes). In the dehumidifying operation, the first bypass damper (83) and the second bypass damper (84) are always closed.

  When the air supply fan (26) is operated, outdoor air (OA) flows into the outside air inlet (24) of the humidity control device (10) via the outside air suction duct (111). When the exhaust fan (25) is operated, the room air (RA) flows into the indoor air inlet (23) of the humidity control device (10) via the indoor air intake duct (112).

  In the first operation of the dehumidifying operation, as shown in FIG. 5, the first inside air side damper (41), the second outside air side damper (44), the second air supply side damper (46), and the first exhaust side damper ( 47) is opened, and the second inside air damper (42), the first outside air damper (43), the first air supply side damper (45), and the second exhaust side damper (48) are closed. In the refrigerant circuit (50) during the first operation, the four-way switching valve (54) is set to the first state (the state shown in FIG. 3A), and the first adsorption heat exchanger (51) is condensed. The second adsorption heat exchanger (52) becomes an evaporator. That is, in the first operation, the adsorbent of the first adsorption heat exchanger (51) is heated with the high-pressure refrigerant, and the adsorbent of the second adsorption heat exchanger (52) is cooled with the low-pressure refrigerant. As a result, in the first adsorption heat exchanger (51) on the heating side, a regeneration operation for releasing the adsorbed moisture into the air is performed, and in the second adsorption heat exchanger (52) on the cooling side, in the air An adsorption operation for adsorbing moisture is performed.

  In the first operation of the dehumidifying operation, the outdoor air (OA) that has flowed into the outside air inlet (24) flows into the second heat exchanger chamber (38), and the second adsorption heat exchanger (52) on the evaporator side. Pass through. In the second adsorption heat exchanger (52), moisture in the air is adsorbed by the adsorbent, and the adsorption heat generated at that time is absorbed by the refrigerant. The air dehumidified by the second adsorption heat exchanger (52) flows out from the air supply port (22) to the outside of the humidity control device (10), and is supplied indoors through the air supply duct (113). .

  The room air (RA) that has flowed into the room air inlet (23) flows into the first heat exchanger chamber (37) and passes through the first adsorption heat exchanger (51) on the condenser side. In the first adsorption heat exchanger (51), moisture is desorbed from the adsorbent heated by the refrigerant, and the desorbed moisture is given to the air. The air given moisture by the first adsorption heat exchanger (51) flows out of the humidity control device (10) from the exhaust port (21), and is discharged to the outside through the exhaust duct (114). .

  In the second operation of the dehumidifying operation, as shown in FIG. 6, the second inside air side damper (42), the first outside air side damper (43), the first air supply side damper (45), and the second exhaust side damper ( 48) is opened, and the first inside air damper (41), second outside air damper (44), second air supply damper (46), and first exhaust damper (47) are closed. In the refrigerant circuit (50) during the second operation, the four-way switching valve (54) is set to the second state (the state shown in FIG. 3B), and the first adsorption heat exchanger (51) is evaporated. The second adsorption heat exchanger (52) becomes a condenser. That is, in the second operation, the adsorbent of the first adsorption heat exchanger (51) is cooled by the low-pressure refrigerant, and the adsorbent of the second adsorption heat exchanger (52) is heated by the high-pressure refrigerant. As a result, an adsorption operation is performed in the first adsorption heat exchanger (51) on the cooling side, and a regeneration operation is performed in the second adsorption heat exchanger (52) on the heating side.

  In the second operation, outdoor air (OA) that has flowed into the outside air inlet (24) flows into the first heat exchanger chamber (37) and passes through the first adsorption heat exchanger (51) on the evaporator side. . In the first adsorption heat exchanger (51), moisture in the air is adsorbed by the adsorbent, and the heat of adsorption generated at that time is absorbed by the refrigerant. The air dehumidified by the first adsorption heat exchanger (51) flows out from the air supply port (22) to the outside of the humidity control device (10), and is supplied indoors through the air supply duct (113). .

  The room air (RA) that has flowed into the room air inlet (23) flows into the second heat exchanger chamber (38) and passes through the second adsorption heat exchanger (52) on the condenser side. In the second adsorption heat exchanger (52), moisture is desorbed from the adsorbent heated by the refrigerant, and the desorbed moisture is given to the air. The air given moisture by the second adsorption heat exchanger (52) flows out from the exhaust port (21) to the outside of the humidity control device (10) and is discharged to the outside through the exhaust duct (114). .

<Humidification operation>
In the humidifying operation of the present embodiment, outdoor air (OA) is humidified, and the humidified air is supplied to the room as supply air (SA), and at the same time, the room air (RA) is discharged to the outside as discharge air (EA). . That is, in the humidification operation, indoor humidification and indoor ventilation are performed simultaneously. First, the normal operation of the humidifying operation will be described.

[Normal operation]
In the normal operation of the humidifying operation, the air supply fan (26) and the exhaust fan (25) are in the operating state. Further, in the humidification operation, a first operation and a second operation described later are alternately repeated by switching the open / close state of the plurality of dampers. The first operation and the second operation are switched every predetermined set time (for example, 4 minutes). In the humidification operation, the first bypass damper (83) and the second bypass damper (84) are always closed.

  When the air supply fan (26) is operated, outdoor air (OA) flows into the outside air inlet (24) of the humidity control device (10) via the outside air suction duct (111). When the exhaust fan (25) is operated, the room air (RA) flows into the indoor air inlet (23) of the humidity control device (10) via the indoor air intake duct (112).

  In the first operation of the humidifying operation, as shown in FIG. 7, the second inside air side damper (42), the first outside air side damper (43), the first air supply side damper (45), and the second exhaust side damper ( 48) is opened, and the first inside air damper (41), second outside air damper (44), second air supply damper (46), and first exhaust damper (47) are closed. In the refrigerant circuit (50) during the first operation, the four-way switching valve (54) is set to the first state (the state shown in FIG. 3A), and the first adsorption heat exchanger (51) is condensed. The second adsorption heat exchanger (52) becomes an evaporator (cooling side).

  In the first operation of the humidifying operation, the room air (RA) flowing into the room air inlet (23) flows into the second heat exchanger chamber (38), and the second adsorption heat exchanger (52) on the evaporator side. Pass through. In the second adsorption heat exchanger (52), moisture in the air is adsorbed by the adsorbent, and the adsorption heat generated at that time is absorbed by the refrigerant. The air that has given moisture to the adsorbent of the second adsorption heat exchanger (52) flows out of the humidity control device (10) through the exhaust port (21) and is discharged to the outside through the exhaust duct (114). Is done.

  The outdoor air (OA) that has flowed into the outdoor air inlet (24) flows into the first heat exchanger chamber (37) and passes through the first adsorption heat exchanger (51) on the condenser side. In the first adsorption heat exchanger (51), moisture is desorbed from the adsorbent heated by the refrigerant, and the desorbed moisture is given to the air. The air humidified by the first adsorption heat exchanger (51) flows out from the air supply port (22) to the outside of the humidity control device (10), and is supplied indoors through the air supply duct (113). .

  In the second operation of the humidifying operation, as shown in FIG. 8, the first inside air side damper (41), the second outside air side damper (44), the second air supply side damper (46), and the first exhaust side damper ( 47) is opened, and the second inside air damper (42), the first outside air damper (43), the first air supply side damper (45), and the second exhaust side damper (48) are closed. In the refrigerant circuit (50) during the second operation, the four-way switching valve (54) is set to the second state (the state shown in FIG. 3B), and the first adsorption heat exchanger (51) is evaporated. The second adsorption heat exchanger (52) becomes a condenser (heating side).

  In the second operation of the humidifying operation, the room air (RA) flowing into the room air inlet (23) flows into the first heat exchanger chamber (37), and the first adsorption heat exchanger (51) on the evaporator side. Pass through. In the first adsorption heat exchanger (51), moisture in the air is adsorbed by the adsorbent, and the heat of adsorption generated at that time is absorbed by the refrigerant. The air that has given moisture to the adsorbent of the first adsorption heat exchanger (51) flows out from the exhaust port (21) to the outside of the humidity control device (10) and is discharged to the outside through the exhaust duct (114). Is done.

  The outdoor air (OA) that has flowed into the outdoor air inlet (24) flows into the second heat exchanger chamber (38) and passes through the second adsorption heat exchanger (52) on the condenser side. In the second adsorption heat exchanger (52), moisture is desorbed from the adsorbent heated by the refrigerant, and the desorbed moisture is given to the air. The air humidified by the second adsorption heat exchanger (52) flows out from the air supply port (22) to the outside of the humidity control device (10), and is supplied indoors through the air supply duct (113). .

[Bypass operation]
The humidification operation described above is often performed in the winter when air is easily dried. For this reason, in humidification operation, the temperature of outdoor air (OA) tends to be relatively low. Therefore, if the humidification operation described above is performed under conditions where the temperature of the outdoor air (OA) is extremely low, the air is released from the adsorbent of the adsorption heat exchanger (51, 52) on the condenser side (heating / regeneration side). The amount of water may decrease.

  That is, in the adsorption heat exchanger (51, 52), it is necessary to raise the temperature of the adsorbent to a predetermined temperature in order to sufficiently release moisture. However, in the first operation and the second operation of the humidification operation described above, if the temperature of the outdoor air (OA) becomes extremely low, the adsorption heat exchanger (51, 52) on the condenser side is cooled by the outdoor air. As a result, the temperature of the refrigerant flowing through the adsorption heat exchanger (51, 52) (condensation temperature) also becomes low. As a result, the temperature of the adsorbent of the adsorption heat exchanger (51, 52) cannot be raised sufficiently, reducing the amount of water released from the adsorbent and greatly reducing the humidification performance in the humidifying operation. There is a risk of it.

  Therefore, in the present embodiment, the following bypass operation is performed when a predetermined condition is satisfied.

  At the start of the humidification operation, the normal operation is performed. At this time, the outside air temperature is detected by the outside air temperature sensor (101). The control unit (100) compares the detected temperature To of the outside air temperature sensor (101) with a predetermined reference temperature Ts set in advance. Here, for example, it is assumed that the temperature of the outdoor air (OA) is a very low temperature (for example, −15 ° C.), and the detected temperature To becomes lower than the reference temperature Ts. In this case, the control unit (100) opens the first bypass damper (83) that has been closed, and holds the first bypass damper (83) at a predetermined opening. As a result, the normal operation is shifted to the bypass operation. The humidifying operation in the bypass operation is the same as the normal operation except that the first bypass damper (83) is opened. Therefore, the detailed description of the switching operation of each damper (41 to 48) and the four-way switching valve (54) and the flow of the indoor air (RA) in the bypass operation is omitted.

  In the bypass operation, part of the outdoor air taken into the outside air suction passage (34) from the outside air suction port (24) is diverted to the first bypass passage (81). In other words, in the bypass operation, only a part of the outdoor air (OA) is sent to the adsorption heat exchanger (51, 52) on the condenser side, and the remaining air flows through the first bypass passage (81) to exchange adsorption heat. Bypass the vessel (51, 52) (see eg FIG. 4). As a result, the flow rate of the outdoor air passing through the condenser-side adsorption heat exchanger (51, 52) is reduced, so that the amount of heat released from the refrigerant in the condenser-side adsorption heat exchanger (51, 52) is also reduced. . As a result, in the refrigerant circuit (50) during the bypass operation, the refrigerant condensation temperature (condensation pressure) of the adsorption heat exchanger (51, 52) on the condenser side increases.

  As described above, when the temperature of the refrigerant flowing through the condenser-side adsorption heat exchanger (51, 52) increases, the temperature of the adsorbent in the condenser-side adsorption heat exchanger (51, 52) also easily rises. . For this reason, in the bypass operation, the adsorbent of the adsorption heat exchanger (51, 52) on the condenser side can be heated to a desired temperature, thereby increasing the amount of moisture released from the adsorbent.

  As described above, the air to which moisture has been given flows out into the air supply fan chamber (36). In addition, the air diverted to the first bypass passage (81) also flows out to the air supply fan chamber (36). The air merged in the air supply fan chamber (36) is supplied into the room via the air supply duct (113).

  If the bypass operation is performed in this way, relatively low-temperature air that has flowed out of the first bypass passage (81) is supplied to the room. However, the air conditioning system (110) is provided with an air conditioner (120) that air-conditions the same space as the indoor space (S) to be processed by the humidity controller (10). For this reason, during the bypass operation of the humidity control apparatus (10), it is possible to prevent the indoor temperature from being lowered by supplying the air heated by the air conditioner (120) into the room. That is, by performing the heating operation with the air conditioner (120) in conjunction with the bypass operation of the humidity control apparatus (10), it is possible to reliably humidify the room while preventing a decrease in the room temperature.

<Simple ventilation operation>
In the simple ventilation operation of this embodiment, outdoor air (OA) is supplied to the room as supplied air (SA) as it is, and at the same time, the indoor air (RA) is discharged to the outside as discharged air (EA). That is, in the simple ventilation operation, indoor humidity control is not performed, and only indoor ventilation is performed.

  In the simple ventilation operation, as shown in FIG. 9, the first bypass damper (83) and the second bypass damper (84) are opened, and the first room air damper (41) and the second room air damper (42 ), A first outside air damper (43), a second outside air damper (44), a first air supplying damper (45), a second air supplying damper (46), a first exhaust air damper (47), and The second exhaust side damper (48) is closed. Further, during the simple ventilation operation, the compressor (53) of the refrigerant circuit (50) is stopped.

  In the simple ventilation operation, outdoor air (OA) flows into the outside air inlet (24) of the humidity controller (10) via the outside air suction duct (111). This air flows from the first bypass passage (81) through the first bypass damper (83) into the air supply fan chamber (36), and then passes through the air supply port (22) and the air supply duct (113). It is supplied to the room via.

  At the same time, the room air (RA) flows into the indoor air inlet (23) of the humidity controller (10) via the indoor air suction duct (112). This air flows from the second bypass passage (82) through the second bypass damper (84) to the exhaust fan chamber (35), and then passes through the exhaust port (21) and the exhaust duct (114). It is discharged outside the room.

-Verification result of bypass operation-
Next, the improvement effect of the humidification performance by the bypass operation described above will be described with reference to FIGS.

  FIG. 10 shows the relationship between the bypass rate in the humidifying operation, the condensation temperature Tc of the refrigerant, and the evaporation temperature Te. Here, the bypass rates shown in FIGS. 10 and 11 are divided into the first bypass passage (81), where Q is the total flow rate of the outdoor air (OA) taken into the casing (11) of the humidity control device (10). This is the ratio of the flow rate Qb of the bypass air to the total flow rate Q when the flow rate of the air (bypass air) is Qb ((Qb / Q) × 100 [%]). Therefore, for example, in the operation of “bypass rate = 0%”, air does not flow through the first bypass passage (81), and the entire amount of outdoor air (OA) is sent to the adsorption heat exchanger (51, 52) on the condenser side. (Ie, it means the normal operation described above). Further, the water release amount in FIG. 11 indicates the amount of water released from the adsorbent of the adsorption heat exchanger (51, 52) during the regeneration operation, for example, per unit time. = 0%) relative to the amount of water released from other operations with different bypass rates, with the amount of water released as a reference (100%).

  First, in the humidifying operation in the normal operation (bypass rate = 0%), the refrigerant condensation temperature Tc and the evaporation temperature Te in the condenser-side adsorption heat exchanger (51, 52) are relatively low (see FIG. 10). reference). Therefore, in normal operation, as described above, the temperature of the adsorbent cannot be sufficiently raised by the adsorption heat exchanger (51, 52) on the condenser side, and the amount of moisture released from the adsorbent is reduced ( (See FIG. 11). On the other hand, the condensation temperature Tc gradually increases as the bypass rate increases. As a result, since the adsorbent can be heated to a higher temperature as the bypass rate increases, the amount of moisture released from the adsorbent increases as the bypass rate increases.

  In the above-described bypass operation, the opening degree of the first bypass damper (83) is maintained so that the bypass rate is about 40%, but the bypass operation is performed at other bypass rates in accordance with the operating conditions and the like. You may do it. Further, for example, the opening degree of the first bypass damper (83) is adjusted in multiple stages so that the bypass rate is gradually increased as the outdoor temperature decreases, and the air flowing through the first bypass passage (81) is adjusted. The amount may be finely controlled.

-Effect of the embodiment-
In the above embodiment, in the humidification operation, only a part of the outdoor air taken into the casing (11) is sent to the adsorption heat exchanger (51, 52) on the condenser side (heating side), and the remaining air is sent to the condenser. It is possible to execute a bypass operation that bypasses the side adsorption heat exchanger (51, 52) and sends it to the room. For this reason, it is possible to avoid that the temperature of the adsorbent of the adsorption heat exchanger (51, 52) on the condenser side cannot be sufficiently raised under conditions where the temperature of the outdoor air (OA) is extremely low. A sufficient amount of moisture can be released from the adsorbent of the side adsorption heat exchanger (51, 52). Therefore, it is possible to prevent the humidification performance of the humidity control device (10) from being significantly lowered under such low outside air conditions, and to ensure the reliability of the humidity control device (10).

  In addition, by performing the above-described bypass operation, it is possible to prevent the adsorbent from being frozen and the generation of condensed water in the adsorption heat exchanger (51, 52) on the evaporator side (cooling side) under low outdoor air conditions. Specifically, for example, in the humidification operation in the normal operation described above, the temperature of the outdoor air (OA) becomes extremely low, and the condensation temperature Tc of the refrigerant in the condenser-side adsorption heat exchanger (51, 52) decreases. Then, along with this, the evaporation temperature Te of the refrigerant in the adsorption heat exchanger (51, 52) on the evaporator side also decreases. As a result, the adsorbent of the adsorption heat exchanger (51, 52) is frozen, and for example, the adsorbent may be peeled off or the moisture adsorption performance by the adsorbent may be reduced. In addition, the indoor air (RA) is suddenly cooled by the adsorption heat exchanger (51, 52) on the evaporator side, so that condensed water may be generated in the vicinity of the adsorption heat exchanger (51, 52). is there.

  However, by performing the bypass operation under the low outside air condition as described above, the refrigerant condensing temperature Tc in the adsorption heat exchanger (51, 52) on the condenser side can be increased. The evaporation temperature Te of the refrigerant in the adsorption heat exchangers (51, 52) can also be increased (see FIG. 10). As a result, freezing of the adsorbent in the adsorption heat exchanger (51, 52) on the evaporator side and generation of condensed water in this adsorption heat exchanger (51, 52) can be prevented. Reliability can be secured.

  Further, in the humidifying operation of the above embodiment, when the temperature of the outdoor air (OA) detected by the outside air temperature sensor (101) becomes lower than a predetermined temperature, the normal operation is shifted to the bypass operation. For this reason, the temperature of the adsorbent of the adsorption heat exchanger (51, 52) on the condenser side can be reliably increased under low outside air conditions, and the reliability of the humidity control apparatus (10) can be more reliably ensured.

-Modification of the embodiment-
About the said embodiment, it is good also as a structure of each modification as follows.

<Modification 1>
As shown in FIG. 12, in the air conditioning system (110) of the first modification, the outdoor air (OA) that has flowed out of the first bypass passage (81) of the humidity control device (10) in the humidifying operation in the bypass operation is After being heated by the air conditioner (120), it is supplied to the room. That is, in the first modification, the start end of the relay duct (115) is connected to the outflow end of the first bypass passage (81) of the humidity controller (10). The terminal end of the relay duct (115) is connected to the inflow side passage (the upstream side passage of the indoor heat exchanger (121)) of the air conditioner (120).

  In the humidification operation of the air conditioning system (110) of Modification 1, when the bypass operation is performed in the same manner as in the above embodiment, a part of the outdoor air (OA) is absorbed by the adsorption heat exchanger (51, 52) on the condenser side. The remaining air flows through the first bypass passage (81). In the adsorption heat exchanger (51, 52) on the condenser side, the temperature of the adsorbent is increased as the amount of heat released from the refrigerant decreases, and the amount of moisture released from the adsorbent increases. As described above, the air containing a large amount of moisture is supplied into the room via the air supply duct (113).

  On the other hand, the air flowing through the first bypass passage (81) passes through the indoor heat exchanger (121) of the air conditioner (120) via the relay duct (115). Thereby, in an indoor heat exchanger (121), the air which was comparatively low temperature is heated to predetermined temperature. The heated air is supplied indoors and used for heating.

<Modification 2>
As shown in FIG. 13, in the air conditioning system (110) of the second modification, the outdoor air (OA) that has flowed out of the first bypass passage (81) of the humidity controller (10) is condensed in the humidifying operation of the bypass operation. Without being merged with the air that has passed through the adsorption heat exchanger (51, 52) on the side of the vessel. That is, in Modification 2, the start end of the bypass duct (116) is connected to the outflow end of the first bypass passage (81) of the humidity control apparatus (10). The end of the bypass duct (116) faces the indoor space (S).

  During the humidification operation of the air conditioning system (110) of the second modification example, if the bypass operation is performed in the same manner as in the above embodiment, a part of the outdoor air (OA) is converted to the adsorption heat exchanger (51, 52 on the condenser side). ) And the remaining air flows through the first bypass passage (81). In the adsorption heat exchanger (51, 52) on the condenser side, the temperature of the adsorbent is increased as the amount of heat released from the refrigerant decreases, and the amount of moisture released from the adsorbent increases. As described above, the air containing a large amount of moisture is supplied into the room via the air supply duct (113). On the other hand, the air flowing through the first bypass passage (81) is supplied into the room via the bypass duct (116).

<Modification 3>
As shown in FIG. 14, the end of the bypass duct (116) of Modification 2 may face the outdoor space. That is, when the bypass operation is performed during the humidifying operation of the air conditioning system (110) of the third modification, a part of the outdoor air taken into the casing (11) is converted to the adsorption heat exchanger (51, 51) on the condenser side. 52), the remaining air is exhausted to the outside through the first bypass passage (81). Thereby, it can prevent that the heating load of an air conditioner (120) will increase by the comparatively low temperature outdoor air which flowed out out of the 1st bypass channel (81) being supplied indoors.

<< Other Embodiments >>
About the said embodiment (The modification is also included), it is good also as the following structures.

  In the above embodiment, the execution of the bypass operation is determined based on the temperature of the outdoor air during the humidifying operation. However, the execution of the bypass operation may be determined based on another index. Specifically, during the humidification operation, the condensation temperature of the refrigerant flowing through the adsorption heat exchanger (51, 52) on the condenser side may be detected, and the execution of the bypass operation may be determined based on the condensation temperature. .

  Specifically, for example, as shown in FIG. 15, the refrigerant circuit (50) is provided with a first refrigerant temperature sensor (51a) and a second refrigerant temperature sensor (52a). The first refrigerant temperature sensor (51a) constitutes a first condensation temperature detector that detects the condensation temperature of the refrigerant flowing through the first adsorption heat exchanger (51), and the second refrigerant temperature sensor (52a) A second condensing temperature detector that detects the condensing temperature of the refrigerant flowing through the adsorption heat exchanger (52) is configured.

  For example, when the humidification operation is performed using the first adsorption heat exchanger (51) as a condenser, the condensation temperature of the refrigerant flowing through the first adsorption heat exchanger (51) is detected by the first refrigerant temperature sensor (51a). Here, when the condensation temperature Tc1 is lower than the predetermined temperature, the normal operation is shifted to the bypass operation. Thereby, the fall of the moisture content discharge | released from the adsorption agent of a 1st adsorption heat exchanger (51) can be avoided beforehand.

  Similarly, when the humidification operation is performed using the second adsorption heat exchanger (52) as a condenser, the condensation temperature of the refrigerant flowing through the second adsorption heat exchanger (52) is detected by the second refrigerant temperature sensor (52a). To do. Here, when the condensation temperature Tc2 is lower than the predetermined temperature, the normal operation is changed to the bypass operation. Thereby, the fall of the moisture content discharge | released from the adsorption agent of a 2nd adsorption heat exchanger (52) can be avoided beforehand.

  In the example of FIG. 15, the refrigerant condensing temperature is detected by the temperature sensors (51a, 52a). However, for example, the pressure on the high pressure side of the refrigerant circuit (50) (the discharge side of the compressor (53)) may be detected, and the saturation temperature corresponding to this pressure may be used as the refrigerant condensing temperature. That is, a high-pressure sensor may be used as the condensation temperature detector.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or its use.

  As described above, the present invention relates to a humidity control apparatus that adjusts indoor humidity, and more particularly, to a humidity control apparatus that includes a refrigerant circuit having an adsorption heat exchanger and performs a humidification operation in which air is humidified by the adsorption heat exchanger. Useful.

10 Humidity control device
11 Casing
50 Refrigerant circuit
51 First adsorption heat exchanger (Adsorption heat exchanger)
51a First refrigerant temperature sensor (condensation temperature detector)
52 Second adsorption heat exchanger (Adsorption heat exchanger)
52a Second refrigerant temperature sensor (condensation temperature detector)
53 Compressor
81 First bypass passage (bypass passage)
83 First bypass damper (variable amount of bypass)
100 Control unit
101 Outside temperature sensor (outside temperature detector)

Claims (4)

It has a casing (11), a compressor (53), and two adsorption heat exchangers (51, 52), and heats the adsorbent of one adsorption heat exchanger (51, 52) with a high-pressure refrigerant, while the other And a refrigerant circuit (50) in which a refrigeration cycle for cooling the adsorbent of the adsorption heat exchanger (51, 52) with a low-pressure refrigerant is performed, taking outdoor air into the casing (11) and heating the taken outdoor air At the same time, it is passed through the side adsorption heat exchanger (51, 52) and supplied to the room. At the same time, the room air is taken into the casing (11), and the taken room air is taken into the cooling side adsorption heat exchanger (51, 52) A humidity control device that performs a humidifying operation to pass through and exhaust to the outside,
A bypass passage (81) formed in the casing (11) so that outdoor air taken into the casing (11) is sent indoors or outdoors bypassing the adsorption heat exchanger (51, 52);
A variable bypass amount mechanism (83) for changing the amount of air flowing through the bypass passage (81);
During the humidification operation, all the outdoor air taken into the casing (11) is passed through the heating-side adsorption heat exchanger (51, 52) and supplied into the room, and taken into the casing (11). A part of the outdoor air is passed through the heating-side adsorption heat exchanger (51, 52) and supplied to the room, and at the same time, the bypass operation for switching the remainder of the outdoor air to the bypass passage (81) is performed. And a control unit (100) for controlling the bypass amount variable mechanism (83) as described above. In claim 1,
The humidity control apparatus according to claim 1, wherein the bypass passage (81) is formed in the casing (11) so that the outdoor air is bypassed the adsorption heat exchanger (51, 52) and sent into the room. In claim 1 or 2,
It has an outdoor temperature detector (101) for detecting the temperature of outdoor air,
In the humidification operation, the control unit (100) is configured to perform the bypass operation so as to perform the bypass operation when the outdoor air temperature detected by the outside air temperature detection unit (101) is lower than a predetermined temperature. ) To control the humidity control device. In claim 1 or 2,
A condensation temperature detector (51a, 52a) for detecting the condensation temperature of the high-pressure refrigerant in the refrigerant circuit (50);
In the humidification operation, the control unit (100) performs the bypass amount variable mechanism (83) so as to perform the bypass operation when the condensation temperature detected by the condensation temperature detection unit (51a, 52a) becomes lower than a predetermined temperature. ) To control the humidity control device.

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