KR20010029975A - Indoor unit of an air conditioner - Google Patents

Abstract

PURPOSE: To provide an indoor unit for an air conditioner capable of improving a heat exchanging performance by effectively utilizing a site having a fastest wind velocity. CONSTITUTION: The indoor unit for an air conditioner comprises a unit body 1 having suction ports 12a, 12 and an air outlet 9 under the ports 12a, 12 at a front panel 2, a main heat exchanger 50A disposed oppositely to the ports and a blower 1 disposed at a rear side of the exchanger 50a in the body, a drain pan 6a disposed under the exchanger 50A, and an auxiliary heat exchanger 50B disposed at a lower front surface side of the exchanger 50A directly above the exchanger 50A to cool a refrigerant to a supercooled state in a dehumidifying operation mode.

Description

Indoor unit of an air conditioner {INDOOR UNIT OF AN AIR CONDITIONER}

The present invention relates to an indoor unit of an air conditioner having an indoor heat exchanger consisting of a main heat exchanger and an auxiliary heat exchanger.

The indoor unit of the conventional air conditioner is arranged so that the heat exchanger and the blower are opposed to each other in the unit main body, and the indoor air sucked into the unit main body by the operation of the blower is sent to the heat exchanger to be heat exchanged and then sucked into the room.

The heat exchanger was initially arranged in an upright position in the form of a flat plate, but was inclined so as to lower the height dimension in the unit main body, and was then shaped into a substantially <-shape. In recent years, in order to obtain further expansion of the heat capacity, a heat exchanger which is formed in a substantially inverted V shape from the side has been widely used.

The substantially inverted V-shaped heat exchanger is composed of a front heat exchanger portion and a rear heat exchanger portion. In particular, since the upper portion of the rear heat exchanger portion becomes a triangular dance space with respect to the upper surface and the rear surface of the unit body, the heat storage capacity is supplemented thereto. It is provided with a heat exchanger, and is connected with the rear heat exchanger part.

In addition, an indoor unit having an air cleaning function as well as a simple heat exchange action is also provided. This air purifier is disposed close to the front face of the front heat exchanger section, and after cleaning a part of the indoor air sucked into the unit body, it is sent to the front heat exchanger section.

By the way, it is common structure that the front heat exchanger part of a substantially reverse V-shaped heat exchanger is curved, this air cleaner is arrange | positioned at this upper front side, and a filter is arrange | positioned at the lower front side.

The indoor air is sucked into the unit body and immediately impinges heat exchange on the particularly lower side of the front heat exchanger section. In other words, the lower front surface of the front heat exchanger portion is the portion with the highest wind speed, and the heat exchange action between the heat exchange air and the refrigerant is performed more effectively than the other portions.

However, since no means other than the filter is provided in the lower part of the front heat exchanger part, there is a problem in that it is not effectively used as an efficient heat exchange part.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide an indoor unit of an air conditioner that can obtain an improvement in heat exchange performance by effectively using a portion having the largest wind speed of the heat exchanger.

1 is a cross-sectional view of an indoor unit of an air conditioner according to an embodiment of the present invention;

2 is a configuration diagram of a refrigeration cycle circuit according to the same embodiment;

3 schematically shows an indoor unit according to the same embodiment, and also for explaining the flow of refrigerant;

4 is a configuration diagram of a refrigeration cycle circuit according to the same embodiment;

5 is a view illustrating a detachment operation of the air cleaner according to the same embodiment;

6 schematically shows an indoor unit according to the same embodiment, and illustrates a flow of refrigerant.

* Explanation of symbols for the main parts of the drawings

1: unit body 5: indoor heat exchanger

7: indoor blower 50A: main heat exchanger

6a: front drain pan 6b: rear drain pan

50B: Auxiliary Heat Exchanger 23: Electronic Expansion Valve

40: support mechanism

In order to achieve the above object, the indoor unit of the air conditioner of the present invention is a main body heat exchanger disposed as opposed to an intake port in a unit body having an intake port provided on the front panel and having an intake port below this, as claimed in claim 1. And a blower disposed at the rear of the main heat exchanger, a drain pan disposed below the main heat exchanger and a lower front side of the main heat exchanger immediately below the drain pan, to cool the refrigerant in the dehumidification operation mode. An auxiliary heat exchanger provided in the cooling state is provided.

Claim 2 is characterized in that the refrigeration cycle circuit is configured so that the refrigerant is sent to the auxiliary heat exchanger before the main heat exchanger in the cooling operation mode in the indoor unit of the air conditioner according to claim 1.

Claim 3 is a refrigerant throttling device provided upstream of an auxiliary heat exchanger in a cooling operation mode and a dehumidification operation mode in an indoor unit of an air conditioner according to claim 2, wherein the refrigerant throttling device is in a dehumidification operation mode than a cooling operation mode. It is characterized in that largely constricted.

In the indoor unit of the air conditioner according to claim 1, a refrigerant condensing device is interposed between the main heat exchanger and the auxiliary heat exchanger, and the refrigerant condensing device is condensed by the main heat exchanger in the heating atmosphere dehumidification operation mode. It is characterized in that the heat exchanger is throttled to perform a cooling action.

In the indoor unit of the air conditioner of Claim 1, the air cleaner is arrange | positioned in the upper part of the auxiliary heat exchanger in the front side of a main heat exchanger, and does not interfere with an auxiliary heat exchanger in the front side of the main heat exchanger of a unit main body. Characterized in that the support means for supporting the air cleaner detachably freely installed.

In order to satisfy the above object, the indoor unit of the air conditioner of the present invention has a unit main body provided with a suction port on the front panel of claim 6, and a suction port is provided below the suction port, and disposed opposite to the suction port in the unit main body. And a blower disposed near the main heat exchanger, and a front drain fan and a rear drain fan disposed below the front part and the rear part of the main heat exchanger. And a pair of auxiliary heat exchangers each disposed at a lower front side at the front of the main heat exchanger and at an upper surface at the rear of the main heat exchanger to supercool the refrigerant in the dehumidification operation mode.

Claim 7 is characterized in that the refrigeration cycle circuit is configured so that the refrigerant is sent to the auxiliary heat exchanger before the main heat exchanger in the cooling operation mode in the indoor unit of the air conditioner according to claim 6.

Claim 8 is an indoor unit of the air conditioner according to claim 7, wherein the throttling mechanism is provided upstream of the auxiliary heat exchanger in the cooling operation mode, wherein the throttling device is throttled more in the dehumidification operation mode than in the cooling operation mode. It is done.

By adopting a means for solving the above problems, an auxiliary heat exchanger is arranged on the lower front side of the main wind exchanger, and in the dehumidification operation mode, the auxiliary heat exchanger is used as a dehumidification heat exchanger to obtain a large amount of dehumidification. Get an improvement. In addition, the drain generated in the auxiliary heat exchanger does not flow to the main heat exchanger but flows directly to the drain pan to prevent re-evaporation in the main heat exchanger.

Embodiment of the Invention

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described with reference to drawings.

As shown in Figure 1, the indoor unit of the air conditioner is configured.

The unit main body 1 consists of the front panel 2 and the top panel 3, the back plate 4 which integrally provided both the side part, the back part, and the bottom part, and is formed in the horizontally long box shape.

Inside the unit body 1, an indoor heat exchanger 5 is formed which is formed in a substantially inverted V shape from the side. The indoor heat exchanger 5 is provided with a plurality of fins f arranged side by side with a narrow gap therebetween, and a heat exchange pipe p for forming a refrigerant flow path therethrough.

In addition, the indoor heat exchanger 5 will be described. It is composed of a main heat exchanger 50A and an auxiliary heat exchanger 50B. The main heat exchanger 50A includes a front heat exchanger portion 5a located on the front side and a rear heat exchanger portion 5b located on the rear side. The auxiliary heat exchanger 50B includes a front auxiliary heat exchanger 5c disposed close to the lower front side of the front heat exchanger 5a and a rear auxiliary heat exchanger 5d disposed along the upper surface of the rear heat exchanger 5b. Is made of.

A front drain fan 6a is disposed immediately below the front heat exchanger portion 5a and the front auxiliary heat exchanger portion 5c, and a rear drain fan 6b is disposed directly below the rear heat exchanger portion 5b. These front and rear drain pans 6a and 6b are integrally provided with the rear plate 4.

An indoor blower 7 having a cross flow fan is disposed between the front heat exchanger portion 5a and the rear heat exchanger portion 5b, which are internal positions of the indoor heat exchanger 5. The rear plate 4 is bent from the rear side of the rear side of the indoor blower 7 below the rear drain pan 6b to the bottom portion, and the air blower 8 is disposed between the lower surface portion of the front drain pan 6a and its extended portion. ) Is formed.

A suction port 9 is provided in the lower portion of the front panel 2 forming the tip of the blower 8 along the width direction. Each of the air outlets 9 is provided with an unillustrated wind direction guide unit for automatically changing the direction of the air drawn out from the air outlet 9 by combining a plurality of longitudinal and horizontal louvers.

On the other hand, the upper panel 3 is fitted with a ladder assembled in a frame shape, the space portion is formed as the upper suction port (11). The front panel 2 is formed in an R-shaped cross section, and front inlets 12a and 12b having different structures are provided over two stages of upper and lower portions.

The air cleaner 13 is disposed at a position close to the front side upper portion of the front heat exchanger portion 5a at a portion facing the front portion suction port 12a of the front panel 2. The air purifier 13 is composed of an electrostatic precipitator for removing dust and water vapor in the room and a high performance deodorizing filter of honeycomb activated carbon structure for removing odors in the room. Are arranged side by side to each other.

As the indoor unit of the air conditioner configured as described above, when the operation start button of a remote controller (not shown) is pressed, the refrigeration cycle operation for the indoor heat exchanger 5 and the operation of the indoor blower 7 are started.

The indoor air is sucked into the unit body 1 from the inlet 12a, 12b, 11 of the front panel 2 and the top panel 3 of the unit body 1. In particular, the indoor air sucked into the front inlet 12a first passes through the air cleaner 13, and impurities such as dust and water vapor contained in the indoor air are captured and cleaned, and then, the indoor air exchanger 5 is cleaned. Sent to heat exchange.

The indoor air sucked from the front inlet 12b and the upper inlet 11 is directly sent to the indoor heat exchanger 5 for heat exchange, and the air cleaner 13 and a part of the indoor heat exchanger 5 join the flowing air. It is guided to the blowing path 8 through the indoor blower 7 and is sucked out from the suction opening 9 to the indoor space.

Basically, as an indoor unit of the air conditioner, which is configured as described above and functions, the present invention provides an indoor heat exchanger composed of a main heat exchanger 50A and an auxiliary heat exchanger 50B, as described below. There is a characteristic in (5).

The refrigeration cycle circuit of this air conditioner is shown in FIG. As described above, an indoor heat exchanger 5 including a main heat exchanger 50A and an auxiliary heat exchanger 50B is disposed in the indoor unit, and is connected in series with each other.

The indoor heat exchanger (5) includes a compressor (20) accommodated in an outdoor unit (not shown), an all-way valve (21), an electronic expansion valve (23) forming an outdoor heat exchanger (22), and a refrigeration condenser. It is connected to form a heat pump type refrigeration cycle through.

The compressor 20, the four-way valve 21, and the electromagnetic expansion valve 23 are connected to the control device 25. The control device 25 controls the operation frequency of the compressor 20 by the control device 25. Reference numeral 21 denotes four ports for switching control, and the electromagnetic expansion valve 23 controls the amount of throttle.

White arrows in FIG. 2 indicate the flow of the refrigerant in the dehumidification operation mode. That is, the high temperature and high pressure refrigerant gas discharged from the compressor 20 is sent to the outdoor heat exchanger 22 through the four-way valve 21 to liquefy condensation. The hatching symbol in the outdoor heat exchanger 22 of FIG. 2 indicates a state in which the refrigerant gas is liquefied.

The liquefied refrigerant exiting the outdoor heat exchanger 22 is reduced in pressure by largely throttling the flow rate in the electromagnetic expansion valve 23, but the control device 25 is the electromagnetic expansion valve 23 so as to achieve a larger amount of throttling than the cooling operation mode described later. Is in control.

The liquefied refrigerant is sent from the electromagnetic expansion valve 23 to the auxiliary heat exchanger 50B constituting the outdoor heat exchanger 5. The refrigerant evaporates completely during the flow of the auxiliary heat exchanger 50B because the refrigerant is largely throttled. The coolant enters a supercooled state to cool the auxiliary heat exchanger 50B.

When the refrigerant completely evaporated in the auxiliary heat exchanger 50B is sent to the main heat exchanger 50A, it is here called a superheated state and flows. Then, it is sucked into the compressor 20 through the four-way valve 21 and circulates the above-described path again.

As schematically shown in FIG. 3, the auxiliary heat exchanger 50B may be concentrated on the lower front surface side of the main heat exchanger 50A, which is the site having the largest wind speed. Therefore, the refrigerant that heat exchanges in the auxiliary heat exchanger 50B is in a supercooled state, while the indoor air is completely cooled and dehumidified by the auxiliary heat exchanger 50B.

In the main heat exchanger 50A, since the refrigerant is in an overheated state, the indoor air once cooled and dehumidified is warmed this time. From the main heat exchanger 50A, indoor air rises to room temperature and is blown into the room from the intake opening 9. Thus, efficient dehumidification of the indoor space is achieved.

That is, in order to suppress the fall of room temperature by sensible heat, and to improve the dehumidification effect by latent heat, the auxiliary heat exchanger 50B is used as a dehumidification heat exchanger, and the indoor heat exchange so that evaporation of a refrigerant | coolant is completed in this dehumidification heat exchanger 50B. The controller 25 controls the electromagnetic expansion valve 23 so that the difference between the inlet temperature and the intermediate temperature of the machine 5 is the amount of overheating and this value is set to an arbitrary setting.

By setting the position of the auxiliary heat exchanger 50B with respect to the main heat exchanger 50A, the temperature of the auxiliary heat exchanger 50B is lower than the temperature of the indoor heat exchanger in the conventional dehumidification operation mode and the latent heat increases. do. The refrigerant does not have a temperature drop when evaporation is surely completed in the auxiliary heat exchanger 50B and sent to the main heat exchanger 50A. Therefore, the air temperature sucked out from the air outlet 9 rises to a state close to room temperature, the sensible heat decreases, and efficient dehumidification operation is performed.

Moreover, the heat capacity of the indoor heat exchanger 5 is increased without changing the size of the unit main body 1, so that the heat exchange efficiency and heat exchange performance can be improved, and the air velocity of the indoor air flowing through the indoor heat exchanger 5 can be obtained. The distribution is uniform and smooth, and the quiet operation is performed by suppressing the occurrence of blowing noise.

Moreover, since the front auxiliary heat exchanger part 5c which comprises the auxiliary heat exchanger 50B is arrange | positioned directly in front of the front drain pan 6a, the discharge | emission water produced here is the front heat exchanger part which comprises the main heat exchanger 50A ( It does not flow to 5a) but falls to the front drain pan 6a. Thus, re-evaporation of the discharged water in the front heat exchanger portion 5a is prevented.

You may comprise the refrigeration cycle circuit shown in FIG. An auxiliary electromagnetic expansion valve 30 serving as an auxiliary refrigerant throttling device is provided between the auxiliary heat exchanger 50B constituting the indoor heat exchanger 5 and the main heat exchanger portion 50A. In addition, as described above, the electronic expansion valve 23 serving as the refrigerant throttling device is not changed between the outdoor heat exchanger 33 and the auxiliary heat exchanger 50B.

When the dehumidification operation mode is designated, a control device (not shown) switches the four-way valve 21 in the heating operation mode direction. The refrigerant gas discharged from the compressor 20 circulates in the direction indicated by the arrow in the figure.

At the same time, the control unit throttles only the auxiliary electromagnetic expansion valve 30 by a predetermined amount, and the electromagnetic expansion valve 23 is almost opened. The refrigerant gas is sent to the main heat exchanger (50A) through the four-way valve 21 to liquefy condensation, throttled by the auxiliary electromagnetic expansion valve (30), sent to the auxiliary heat exchanger (50B), and evaporated, and then the electronic expansion valve (23). And sucked into the compressor 20 through the outdoor heat exchanger 22.

On the other hand, the indoor air sucked into the unit body (1) exchanges heat with the auxiliary heat exchanger (50B) located upstream to remove latent heat of evaporation of the refrigerant, and then heat exchanges with the main heat exchanger (50A) to absorb the heat of condensation of the refrigerant. do.

That is, the auxiliary heat exchanger 50B performs the cooling dehumidification action with respect to the indoor air and the main heat exchanger performs the reheating action, thereby enabling efficient heating atmosphere dehumidification operation.

As shown in Figs. 5A and 5B, in the unit body 1 having an auxiliary heat exchanger 50B on the lower front side of the main heat exchanger 50A, and having an air cleaner 13 attached to this upper portion. On the front side of the main heat exchanger (50A), the support mechanism (support means) 40 for detachably supporting the air cleaner 13 is provided.

The support mechanism 40 includes a holding edge 41 having a U-shaped cross section provided at an upper portion of the auxiliary heat exchanger 50B, and almost the top of the main heat exchanger 50A almost above the holding edge 41. A cross section provided on the side is formed of a guide frame 42 that is bent in a substantially c-shape.

The holding frame 41 and the guide frame 42 are provided in pairs at positions opposite to the left and right sides of the air cleaner 13, respectively. As for the holding | maintenance edge 41, the front side is opened, and the guide edge 42 is open downward. The guide edge 42 forms a shorter portion than the retaining edge 41, and the interval between the fragments gradually increases from the bent end toward the open end.

On the other hand, the air cleaner 13 is an air cleaner 13a with an upper side substantially purifying air, and the lower side is a handle 13b. Two pin parts 43 and 44 are provided on the left and right sides of the air cleaner 13a and the handle part 13b, respectively.

Therefore, as shown in FIG. 5A, the air cleaner 13 is supported on the front surface of the main heat exchanger 50A so that the pin 44 of the handle 13b is fitted to the holding edge 41, and the air cleaner 12. This is because the pin portion 43 of the government 13a is in a state of being fitted into the bent end of the guide frame 42.

To remove the air cleaner 13 for maintenance, the front panel 2 is opened and the handle 13b is pulled straight forward. The pin portion 44 of the handle portion 13b is pulled out of the holding edge 41 to be free, and the air cleaner 13 itself is in an oblique position.

If the air cleaner 13 is shifted downward as it is, as shown by the dashed-dotted line in FIG. 5B, the fin part 43 of the air cleaner 13a is almost at the open end of the guide frame 42, and the air cleaner 13 is moved. It can be taken out from the support mechanism 40. At this time, since the air cleaner 13 is in an oblique position, the air cleaner 13 does not interfere with the subsidiary heat exchanger 50B.

After maintenance, the air purifier 13 is attached to the support mechanism 40. At first, as shown by the solid line in FIG. 5B, the air cleaner 13 is in an extremely oblique state. ) Is inserted into the guide frame 42, and the air cleaner 13 is pulled upward as it is.

As indicated by the dashed-dotted line in FIG. 5B, the grip portion 13b pushes the handle portion 13b toward the main heat exchanger 50A at the place where the fin portion 43 of the air cleaner 13a abuts against the bent end of the guide edge 42. Inevitably, the pin portion 44 of the handle portion 13b is fitted to the retaining edge 41 to support the attachment of the air cleaner 13. At this time, the air cleaner 13 does not interfere with the auxiliary heat exchanger 50B at all, and thus the detachable operability is good.

FIG. 6 schematically shows the indoor unit described above with reference to FIG. 1, and specifically illustrates the piping system of the indoor heat exchanger 5. Since the indoor heat exchanger 5 and the other parts configuration are the same as those previously described in FIG. 1, the same numerals are used and the new description is omitted.

In the indoor heat exchanger 5, the front and rear auxiliary heat exchanger portions 5c and 5d are connected in series with each other, and the front and rear heat exchanger portions 5a and 5b are connected in series with each other. The auxiliary heat exchanger 50B and the main heat exchanger 50A are connected in series with each other. An electromagnetic expansion valve 23 as a refrigerant throttling device is provided upstream of the indoor heat exchanger 5 in the dehumidification operation mode and the cooling operation mode.

Referring to the flow of the refrigerant in the dehumidifying and cooling operation modes of the indoor heat exchanger 5 in detail, the refrigerant enters the rear auxiliary heat exchanger 5d from the electromagnetic expansion valve 23 and exits the front auxiliary heat exchanger portion 5c. ). Next, it is sent to the front heat exchanger part 5a, ascends from the lower end of the heat transfer side, and enters the rear heat exchanger part 5b. In the rear heat exchanger part 5b, it is sent from the upper end part of a post-heating side to a lower part, and U turns to the upper end part of a heat-transfer side, and flows out to the lower part of the post-heating side of the front heat exchanger part 5a again, and goes out.

In the dehumidification operation mode, the refrigerant flows the auxiliary heat exchanger 50B from the rear auxiliary heat exchanger portion 5d to the front auxiliary heat exchanger portion 5c, and enters the supercooled state by setting the axial amount of the electromagnetic expansion valve 23. Moreover, 50 A of main heat exchangers flow from the front heat exchanger part 5a to the rear heat exchanger part 5b, and it will be overheated. Therefore, the indoor air sucked into the unit main body 1 is completely dehumidified efficiently and is taken out again indoors.

Even in the cooling operation mode, since the refrigerant cycle circuit is configured to send the refrigerant to the auxiliary heat exchanger 50B before the main heat exchanger 50A, the cooling effect of the auxiliary heat exchanger 50B can be increased, thereby improving the cooling effect. You can get it.

In addition, since the electromagnetic expansion valve 23 provided upstream of the auxiliary heat exchanger 50B is throttled larger in the dehumidification operation mode than the cooling operation mode, only the auxiliary heat exchanger 50B evaporates, and thus the main heat exchanger 50A ) Is overheated, and the temperature is close to room temperature in the main heat exchanger 50A. For this reason, the air cooled and dehumidified by the auxiliary heat exchanger 50B becomes warm in the main heat exchanger 50A, and it is taken out into an indoor space, and the fall of room temperature is suppressed to the minimum.

As described above, according to the present invention, the auxiliary heat exchanger is disposed on the lower front side of the main heat exchanger having the largest wind speed, and in particular, in the dehumidification operation mode, the auxiliary heat exchanger is used as the dehumidification heat exchanger, so that the dehumidification performance is increased to obtain an improved dehumidification performance. Can be. In addition, the discharge water generated in the auxiliary heat exchanger does not flow to the main heat exchanger, but immediately falls into the drain pan, thereby preventing re-evaporation in the main heat exchanger, thereby improving heat exchange performance.

Claims (8)

A unit body provided with a suction port at a front panel and having a suction port below the suction port; A main heat exchanger disposed in the unit body so as to face the intake port, and a blower disposed behind the main heat exchanger; A drain pan disposed below the main heat exchanger; And And an auxiliary heat exchanger disposed at a lower front side of the main heat exchanger at an upper portion of the drain pan and configured to subcool the refrigerant in the dehumidification operation mode. The method of claim 1, An indoor unit of an air conditioner, wherein a refrigeration cycle circuit is configured to send refrigerant to an auxiliary heat exchanger before the main heat exchanger in a cooling operation mode. The method of claim 2, A refrigerant throttling device is provided upstream of the auxiliary heat exchanger in the cooling operation mode and the dehumidification operation mode, The refrigerant throttling device is indoor unit of the air conditioner, characterized in that the throttling larger than the cooling operation mode in the dehumidification operation mode. The method of claim 1, An auxiliary refrigerant throttling device is interposed between the main heat exchanger and the auxiliary heat exchanger, The refrigerant condensing device is an indoor unit of the air conditioner, the condensing action of the main heat exchanger in the heating atmosphere dehumidification operation mode is characterized in that the auxiliary heat exchanger is condensed to cool. The method of claim 1, An air cleaner is disposed above the auxiliary heat exchanger on the front side of the main heat exchanger. Indoor unit of the air conditioner, characterized in that the support means for detachably supporting the air cleaner is installed on the front side of the main heat exchanger of the unit body without interfering with the auxiliary heat exchanger. A unit main body having a suction port at a front panel and a suction port disposed below the suction port; A main heat exchanger disposed in the unit main body and opposed to the intake port, the main heat exchanger being formed in a substantially inverted V shape from the side and a blower disposed near the main heat exchanger; A front drain fan and a rear drain fan disposed below the front part and the rear part of the main heat exchanger; And And a pair of auxiliary heat exchangers disposed at the front of the main heat exchanger at the lower front side and the upper surface of the rear part, respectively, and having a pair of auxiliary heat exchangers to cool the refrigerant in the dehumidification operation mode. The method of claim 6, An indoor unit of an air conditioner, wherein a refrigeration cycle circuit is configured to send refrigerant to an auxiliary heat exchanger before the main heat exchanger in a cooling operation mode. The method of claim 7, wherein In the cooling operation mode, the throttling mechanism is provided upstream of the auxiliary heat exchanger, and the throttling device is throttled more in the dehumidification operation mode than in the cooling operation mode.