JP2012172849A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent dew condensation of a radiation panel (radiation heat exchanger) in cooling operation and generation of abnormal noise in radiation heating operation.SOLUTION: A refrigerant circuit 10 has a first flow path 12 provided with an indoor heat exchanger 20 and a second flow path 13 which is connected to the first flow path 12 in parallel and is provided with the radiation panel 30. In the circuit in the heating operation, an indoor motor-operated valve 23 is provided downstream from the radiation panel 30 in the second flow path 13. In the second flow path 13, an auxiliary heat exchanger 37 is provided between the radiation panel 30 and the indoor motor-operated valve 23.

Description

  The present invention relates to an air conditioner including a refrigerant circuit in which an indoor heat exchanger and a radiant heat exchanger are connected in parallel.

  As an air conditioner, a compressor, an indoor heat exchanger for performing hot air heating, a radiation panel for performing radiant heating, a decompression mechanism, and a refrigerant circuit having an outdoor heat exchanger are known. (For example, refer to Patent Document 1). In the refrigerant circuit of the air conditioner disclosed in Patent Document 1, the indoor heat exchanger and the radiant panel are connected in parallel.

Japanese Patent Application Laid-Open No. 5-280762

  In the air conditioner as described above, it is conceivable to provide a valve mechanism for adjusting the flow rate of the refrigerant supplied to the radiation panel on the downstream side of the radiation panel during the heating operation. In such an air conditioner, the valve mechanism is closed during the cooling operation, and the refrigerant flows only through the indoor heat exchanger without flowing through the radiation panel. During the warm air heating operation, the valve mechanism is closed, so that the refrigerant does not flow through the radiation panel and the refrigerant flows only through the indoor heat exchanger. During the radiant heating operation, the valve mechanism is opened, and the refrigerant flows into both the radiant panel and the indoor heat exchanger.

  In the above refrigerant circuit, when the refrigerant leaks from the valve mechanism that should have been closed due to a failure of the valve mechanism or the like during cooling operation, the low-temperature and low-pressure refrigerant flows into the piping of the radiation panel, and the radiation panel Condensation will occur. Further, during the radiant heating operation, the refrigerant may not be completely liquefied in the radiant panel. In such a case, abnormal noise is generated when the refrigerant mixed with the gas refrigerant passes through the valve mechanism on the downstream side of the radiation panel. Further, when the refrigerant mixed with the gas refrigerant merges with the liquid refrigerant from the indoor heat exchanger on the downstream side of the radiation panel, noise is generated.

  Therefore, an object of the present invention is to provide an air conditioner that can prevent condensation of a radiant panel (radiant heat exchanger) during cooling operation and generation of abnormal noise during radiant heating operation.

  An air conditioner according to a first aspect of the present invention includes a refrigerant circuit having a compressor, an indoor heat exchanger for performing hot air heating, a radiant heat exchanger for performing radiant heating, a decompression mechanism, and an outdoor heat exchanger. An air conditioner, wherein the refrigerant circuit includes a main flow path in which a decompression mechanism, an outdoor heat exchanger, and a compressor are provided in order, and a branch provided on the downstream side of the compressor in the main flow path during heating operation A first flow path in which the indoor heat exchanger is provided, and the branching section and the merge section are connected to the first flow path and the merging section provided on the upstream side of the pressure reducing mechanism. And a second flow path provided with the radiant heat exchanger, and a valve mechanism is provided between the radiant heat exchanger and the merging portion in the second flow path. And between the radiant heat exchanger and the valve mechanism in the second flow path. The auxiliary heat exchanger is provided.

  In this air conditioner, when the low-temperature and low-pressure refrigerant leaks from the valve mechanism due to a failure or the like during the cooling operation, the refrigerant flows into the auxiliary heat exchanger and is heated. Therefore, low-temperature and low-pressure refrigerant does not flow directly into the radiant heat exchanger, so that condensation of the radiant heat exchanger can be prevented. In addition, during the radiant heating operation, the refrigerant flowing into the second flow path flows into the radiant heat exchanger and is condensed, and then flows into the auxiliary heat exchanger. At this time, if gas refrigerant is mixed with the refrigerant, it is condensed in the auxiliary heat exchanger. Therefore, at the time of heating operation, the refrigerant sent to the valve mechanism and the junction on the downstream side of the auxiliary heat exchanger can be completely liquefied. Therefore, since the liquid refrigerant passes through the valve mechanism, it is possible to prevent abnormal noise. In addition, since the supercooling liquid and the liquid in the first flow path merge together at the junction, it is possible to prevent the generation of abnormal noise.

  An air conditioner according to a second invention is the air conditioner according to the first invention, wherein the indoor heat exchanger is provided so as to face a fan inside the indoor unit, and the radiant heat exchanger is It is provided on the surface of the indoor unit.

  In this air conditioner, it is possible to prevent dew condensation from occurring in the radiant heat exchanger provided on the surface of the indoor unit.

  In an air conditioner according to a third aspect, in the air conditioner according to the second aspect, the auxiliary heat exchanger is provided so that an air flow generated by the fan is supplied.

  In this air conditioner, a fan facing the indoor heat exchanger can be used for the auxiliary heat exchanger without separately providing a fan for the auxiliary heat exchanger.

  In the air conditioner pertaining to the fourth invention, in the air conditioner pertaining to the third invention, the auxiliary heat exchanger is stacked on a part of the indoor heat exchanger.

  In this air conditioner, the air flow generated by the fan can be reliably supplied to the auxiliary heat exchanger.

  As described above, according to the present invention, the following effects can be obtained.

  In the first invention, when the low-temperature and low-pressure refrigerant leaks from the valve mechanism due to a failure or the like during the cooling operation, the refrigerant flows into the auxiliary heat exchanger and is heated. Therefore, low-temperature and low-pressure refrigerant does not flow directly into the radiant heat exchanger, so that condensation of the radiant heat exchanger can be prevented. In addition, during the radiant heating operation, the refrigerant flowing into the second flow path flows into the radiant heat exchanger and is condensed, and then flows into the auxiliary heat exchanger. At this time, if gas refrigerant is mixed with the refrigerant, it is condensed in the auxiliary heat exchanger. Therefore, at the time of heating operation, the refrigerant sent to the valve mechanism and the junction on the downstream side of the auxiliary heat exchanger can be completely liquefied. Therefore, since the liquid refrigerant passes through the valve mechanism, it is possible to prevent abnormal noise. In addition, since the supercooling liquid and the liquid in the first flow path merge together at the junction, it is possible to prevent the generation of abnormal noise.

  In 2nd invention, it can prevent that dew condensation arises in the radiant heat exchanger provided in the surface of the indoor unit.

  In 3rd invention, the fan facing an indoor heat exchanger can be used for an auxiliary heat exchanger, without providing the fan for an auxiliary heat exchanger separately.

  In the fourth invention, the air flow generated by the fan can be reliably supplied to the auxiliary heat exchanger.

It is a circuit diagram showing the schematic structure of the air conditioner concerning the embodiment of the present invention, and is a figure showing the flow of the refrigerant at the time of cooling operation and hot air heating operation. It is a circuit diagram showing the schematic structure of the air harmony machine concerning the embodiment of the present invention, and is a figure showing the flow of the refrigerant at the time of radiation heating operation. It is a perspective view of the indoor unit shown in FIG.1 and FIG.2. It is sectional drawing which follows the IV-IV line of the indoor unit shown in FIG.

  Hereinafter, an embodiment of an air conditioner 1 according to the present invention will be described.

<Overall configuration of the air conditioner 1>
As shown in FIG.1 and FIG.2, the air conditioner 1 of this embodiment is provided with the indoor unit 2 installed indoors, and the outdoor unit 6 installed outdoors. The indoor unit 2 includes an indoor heat exchanger 20 provided to face the indoor fan 21, a radiation panel 30, an indoor motor operated valve 23, and an indoor temperature sensor 24 for detecting the indoor air temperature. ing. The outdoor unit 6 includes a compressor 60, a four-way switching valve 61, an outdoor heat exchanger 62, an outdoor fan 63 disposed in the vicinity of the outdoor heat exchanger 62, and an outdoor electric valve 64 (pressure reduction mechanism). And.

  The air conditioner 1 also includes a refrigerant circuit 10 that connects the indoor unit 2 and the outdoor unit 6. The refrigerant circuit 10 has the main flow path 11 in which the outdoor motor operated valve 64, the outdoor heat exchanger 62, and the compressor 60 are provided in order. The suction side piping and the discharge side piping of the compressor 60 are connected to a four-way switching valve 61. At the time of heating operation (as will be described in detail later, when the refrigerant flows in the direction indicated by the solid line arrow in FIG. 1 in the refrigerant circuit 10), the branch portion 10a is provided at the downstream portion of the compressor 60 in the main flow path 11. The junction part 10b is provided in the part which becomes the upstream of the outdoor motor operated valve 64, and is provided. The refrigerant circuit 10 connects the branch portion 10a and the merging portion 10b, and connects the first flow path 12 provided with the indoor heat exchanger 20, and the branch section 10a and the merging section 10b to the first flow path 12. And a second flow path 13 provided with a radiation panel 30.

  An indoor electric valve (valve mechanism) 23 is provided between the radiation panel 30 and the merging portion 10 b in the second flow path 13. Further, a panel entry temperature sensor 25 and a panel exit temperature sensor 26 are attached to both sides of the radiation panel 30 in the second flow path 13. More specifically, the panel input temperature sensor 25 is provided in the pipe on the upstream side of the radiation panel 30 during the heating operation. The panel temperature sensor 26 is provided in a pipe downstream of the radiation panel 30 during heating operation. Further, an auxiliary heat exchanger 37 is provided between the radiation panel 30 and the indoor motor operated valve 23 (more specifically, between the panel temperature sensor 26 and the indoor motor operated valve 23).

  An accumulator 65 is interposed between the suction side of the compressor 60 and the four-way switching valve 61 in the refrigerant circuit 10, and the discharge side of the compressor 60 and the four-way switching valve 61 in the refrigerant circuit 10 are interposed. A discharge temperature sensor 66 is attached between them. Furthermore, an outdoor heat exchanger temperature sensor 68 is attached to the outdoor heat exchanger 62.

  The indoor heat exchanger 20 has a pipe that constitutes a part of the refrigerant circuit 10, and an indoor heat exchanger temperature sensor 27 is attached thereto. The indoor heat exchanger 20 is disposed on the windward side of the indoor fan 21. The air heated or cooled by heat exchange with the indoor heat exchanger 20 is blown into the room as warm air or cold air by the indoor fan 21, whereby hot air heating or cooling is performed.

  The radiation panel 30 is disposed on the surface side of the indoor unit 2 and has a pipe that constitutes a part of the refrigerant circuit 10. Radiant heating is performed by radiating the heat of the refrigerant flowing through the pipe into the room. The indoor motor operated valve 23 is provided to adjust the flow rate of the refrigerant supplied to the radiation panel 30. The auxiliary heat exchanger 37 has a pipe that constitutes a part of the refrigerant circuit 10 and is arranged on the windward side of the indoor fan 21.

  The air conditioner 1 of this embodiment can perform a cooling operation, a hot air heating operation, and a radiant heating operation. The cooling operation is an operation in which the refrigerant is allowed to flow through the indoor heat exchanger 20 without flowing the refrigerant through the radiant panel 30, and the hot air heating operation is the indoor heat exchanger without flowing the refrigerant through the radiant panel 30. 20 is an operation in which a refrigerant is passed through to perform hot air heating. The radiant heating operation is an operation in which the refrigerant is supplied to the indoor heat exchanger 20 to perform hot air heating, and the refrigerant is supplied to the radiant panel 30 to perform radiant heating.

The flow of the refrigerant in the refrigerant circuit 10 during each operation will be described with reference to FIGS. 1 and 2.
During the cooling operation, the indoor electric valve 23 is closed, and the four-way switching valve 61 is switched to the state indicated by the broken line in FIG. Therefore, as indicated by the dashed arrows in FIG. 1, the high-temperature and high-pressure refrigerant discharged from the compressor 60 flows into the outdoor heat exchanger 62 through the four-way switching valve 61. Then, the refrigerant condensed in the outdoor heat exchanger 62 is decompressed by the outdoor electric valve 64 and then flows into the indoor heat exchanger 20. Then, the refrigerant evaporated in the indoor heat exchanger 20 flows into the compressor 60 via the four-way switching valve 61 and the accumulator 65.

  During the cooling operation, the low-temperature and low-pressure refrigerant decompressed by the outdoor motor-operated valve 64 by the closed indoor motor-operated valve 23 does not flow into the auxiliary heat exchanger 37 side than the indoor motor-operated valve 23 in the second flow path 13. It is like that. However, when the refrigerant leaks from the indoor electric valve 23 due to a failure or the like, the low-temperature and low-pressure refrigerant flows into the piping of the auxiliary heat exchanger 37 and is heated.

  During the hot air heating operation, the indoor motor-operated valve 23 is closed and the four-way switching valve 61 is switched to the state shown by the solid line in FIG. Therefore, as indicated by solid arrows in FIG. 1, the high-temperature and high-pressure refrigerant discharged from the compressor 60 flows into the indoor heat exchanger 20 through the four-way switching valve 61. Then, the refrigerant condensed in the indoor heat exchanger 20 is decompressed by the outdoor electric valve 64 and then flows into the outdoor heat exchanger 62. Then, the refrigerant evaporated in the outdoor heat exchanger 62 flows into the compressor 60 via the four-way switching valve 61 and the accumulator 65. Note that the refrigerant discharged from the compressor 60 is prevented from flowing to the joining portion 10b side from the indoor electric valve 23 in the second flow path 13 by the closed indoor electric valve 23. That is, in the second flow path 13, the refrigerant is accumulated upstream of the indoor motor operated valve 23.

  During the radiant heating operation, the indoor motor-operated valve 23 is opened and the four-way switching valve 61 is switched to the state indicated by the solid line in FIG. Therefore, as indicated by solid arrows in FIG. 2, the high-temperature and high-pressure refrigerant discharged from the compressor 60 flows into the first flow path 12 and the second flow path 13 through the four-way switching valve 61. The refrigerant that has flowed into the first flow path 12 flows into the indoor heat exchanger 20 and is condensed. On the other hand, the refrigerant flowing into the second flow path 13 flows into the radiation panel 30 and is condensed, and then flows into the auxiliary heat exchanger 37. At this time, if gas refrigerant is mixed with the refrigerant, it is condensed in the auxiliary heat exchanger 37. Then, the refrigerant condensed in the indoor heat exchanger 20, the radiation panel 30, and the auxiliary heat exchanger 37 is decompressed by the outdoor electric valve 64 and then flows into the outdoor heat exchanger 62. Then, the refrigerant evaporated in the outdoor heat exchanger 62 flows into the compressor 60 via the four-way switching valve 61 and the accumulator 65.

<Configuration of indoor unit 2>
Next, the configuration of the indoor unit 2 will be described.
As shown in FIG. 3, the indoor unit 2 of the present embodiment has a rectangular parallelepiped shape as a whole, and is installed near the indoor floor surface. In the present embodiment, the indoor unit 2 is attached to the wall surface in a state of floating about 10 cm from the floor surface. In the following description, the direction protruding from the wall to which the indoor unit 2 is attached is referred to as “front”, and the opposite direction is referred to as “rear”. 3 is simply referred to as “left-right direction”, and the up-down direction is simply referred to as “up-down direction”.

  As shown in FIG. 4, the indoor unit 2 includes a casing 4, an indoor fan 21 housed in the casing 4, an indoor heat exchanger 20, an auxiliary heat exchanger 37, an outlet unit 46, and an electrical component unit 47. Main equipment and a front grille 42 are mainly provided. As will be described in detail later, the casing 4 has a main suction port 4a formed in its lower wall and auxiliary suction ports 4b and 4c formed in its front wall. Further, an air outlet 4 d is formed on the upper wall of the casing 4. In the indoor unit 2, the indoor fan 21 is driven to suck air from the auxiliary suction ports 4 b and 4 c while sucking air in the vicinity of the floor surface from the main suction port 4 a. And in the indoor heat exchanger 20, it heats or cools with respect to the sucked air, and is harmonized. Thereafter, the conditioned air is blown out from the outlet 4d and returned to the room.

  The casing 4 includes a main body frame 41, an outlet cover 51, a radiation panel 30, and an opening / closing panel 52. As will be described later, the air outlet cover 51 has a front panel portion 51 a, and the radiation panel 30 has a radiation plate 31. The front panel portion 51 a of the blower outlet cover 51, the radiation plate 31 of the radiation panel 30, and the open / close panel 52 are arranged so as to be flush with each other on the front surface of the casing 4, thereby constituting the front panel 5. As shown in FIG. 3, a power button 48 and a light-emitting display portion 49 that indicates the operation status are provided at the upper right end portion of the front panel 5, that is, the right end portion of the front panel portion 51 a of the outlet cover 51. .

  The main body frame 41 is attached to the wall surface and supports the various internal devices described above. And the front grille 42, the blower outlet cover 51, the radiation panel 30, and the open / close panel 52 are attached to the front surface of the main body frame 41 in a state of supporting internal devices. The blower outlet cover 51 is attached to the upper end part of the main body frame 41, and the blower outlet 4d which is a rectangular-shaped opening long in the left-right direction is formed in the upper wall. The radiation panel 30 is attached below the blowout outlet cover 51, and the open / close panel 52 is attached below the radiation panel 30. Between the lower front end of the main body frame 41 and the lower end of the open / close panel 52 is a main suction port 4a which is an opening long in the left-right direction.

Here, each internal device accommodated in the casing 4 will be described.
The indoor fan 21 is disposed slightly above the central portion of the casing 4 in the height direction so that its axial direction is along the left-right direction. The indoor fan 21 sucks air from the lower front and blows it upward and rearward.

  The indoor heat exchanger 20 is arranged substantially in parallel with the front panel 5, and faces upward as the front heat exchanger 20a faces the rear surface of the front panel 5 and from the vicinity of the lower end portion of the front heat exchanger 20a toward the rear surface. It is comprised with the back surface heat exchanger 20b which inclines. The front heat exchanger 20 a is disposed in front of the indoor fan 21, and its upper half faces the indoor fan 21. The rear heat exchanger 20 b is disposed below the indoor fan 21 and faces the indoor fan 21. That is, the indoor heat exchanger 20 has a substantially V shape as a whole, and is disposed so as to surround the front and the lower side of the indoor fan 21.

  The auxiliary heat exchanger 37 is laminated on the back surface of the back surface heat exchanger 20b. That is, the air flow generated by the indoor fan 21 is supplied not only to the indoor heat exchanger 20 but also to the auxiliary heat exchanger 37.

  A drain pan 22 extending in the left-right direction is disposed below the indoor heat exchanger 20 and the auxiliary heat exchanger 37. An electrical component unit 47 is disposed below the drain pan 22.

  The air outlet unit 46 is disposed above the indoor fan 21, and guides the air blown from the indoor fan 21 to the air outlet 4 d formed on the upper wall of the casing 4. The air outlet unit 46 includes a horizontal blade 46a disposed in the vicinity of the air outlet 4d and a vertical blade 46b disposed below the horizontal blade 46a. The horizontal blades 46a change the airflow direction in the vertical direction of the airflow blown from the blower outlet 4d, and open and close the blower outlet 4d. The vertical blades 46b change the wind direction in the left-right direction of the airflow blown from the outlet 4d.

  As described above, the front grille 42 covers the main body frame 41 in a state where internal devices such as the indoor heat exchanger 20, the auxiliary heat exchanger 37, the indoor fan 21, the outlet unit 46, and the electrical component unit 47 are attached. Thus, it is attached to the body frame 41. More specifically, the front grille 42 is attached to the main body frame 41 so as to cover from the substantially central portion in the vertical direction of the front heat exchanger 20a to the lower end of the main body frame 41. The front grill 42 has a filter holding portion 42a and a suction port grill 42b disposed in the main suction port 4a.

  A lower filter 43 and an upper filter 44 are attached to the filter holding portion 42a. As shown in FIG. 4, the lower filter 43 held by the filter holding portion 42a extends downward from a substantially central portion in the vertical direction of the front heat exchanger 20a, and its lower end portion is inclined in the rear oblique direction. doing. The lower end of the lower filter 43 is located in the vicinity of the rear edge of the main suction port 4a. The upper filter 44 extends upward from a substantially central portion in the vertical direction of the front heat exchanger 20a. The lower filter 43 and the upper filter 44 divide the space between the front heat exchanger 20a and the front panel 5 in the front-rear direction.

  The air outlet cover 51 covers the air outlet unit 46. As described above, the air outlet 4d is formed on the upper wall of the air outlet cover 51. Further, a front panel portion 51 a is provided on the front surface of the outlet cover 51. The front panel 51a has a rectangular shape that is long in the left-right direction.

  The radiation panel 30 has a substantially rectangular shape that is long on the left and right. The radiation panel 30 is mainly configured by an aluminum radiation plate 31 and a resin heat insulating cover 32 attached to the back surface of the radiation plate 31. The radiation plate 31 is located below the front panel portion 51 a of the outlet cover 51. As shown in FIG. 4, a panel pipe 36, which is a part of the pipe constituting the refrigerant circuit 10, is attached to the back surface of the radiation plate 31.

  The open / close panel 52 is detachably attached below the radiation plate 31 of the radiation panel 30. The open / close panel 52 has a rectangular shape that is long in the left-right direction. As shown in FIG. 4, the vertical position of the upper end of the open / close panel 52 is substantially the same as the upper end of the front grill 42. As described above, the lower end of the open / close panel 52 constitutes a part of the main suction port 4a. Therefore, by removing the open / close panel 52, the front grill 42 is exposed, and the lower filter 43 and the upper filter 44 attached to the filter holding portion 42a of the front grill 42 can be attached and detached.

<Characteristics of the air conditioner 1 of the present embodiment>
In the air conditioner 1 of the present embodiment, the refrigerant circuit 10 is connected to the first flow path 12 provided with the indoor heat exchanger 20 and the first flow path 12 in parallel, and the radiation panel 30 is provided. The second flow path 13 is provided. In the circuit during the heating operation, an indoor motor-operated valve 23 is provided on the downstream side of the radiation panel 30 in the second flow path 13. Further, an auxiliary heat exchanger 37 is provided between the radiation panel 30 and the indoor motor operated valve 23 in the second flow path 13.
Therefore, when the low-temperature and low-pressure refrigerant leaks from the indoor electric valve 23 due to a failure or the like during the cooling operation, the refrigerant flows into the auxiliary heat exchanger 37 and is heated. Therefore, the low-temperature and low-pressure refrigerant does not flow directly into the radiation panel 30, so that condensation on the radiation panel 30 can be prevented. Further, during the radiant heating operation, the refrigerant flowing into the second flow path 13 flows into the radiant panel 30 and is condensed, and then flows into the auxiliary heat exchanger 37. At this time, if gas refrigerant is mixed with the refrigerant, it is condensed in the auxiliary heat exchanger 37. Therefore, during the heating operation, the refrigerant sent to the indoor motor-operated valve 23 and the junction 10b on the downstream side of the auxiliary heat exchanger 37 can be completely liquefied. Therefore, since the liquid refrigerant passes through the indoor motor-operated valve 23, the generation of abnormal noise can be prevented. Further, since the supercooled liquid and the liquid in the first flow path 12 are merged at the merge portion 10b, it is possible to prevent the generation of abnormal noise.

  Moreover, in the air conditioner 1 of this embodiment, the indoor heat exchanger 20 is provided in the interior of the indoor unit 2 so as to face the indoor fan 21, and the radiation panel 30 is provided on the front surface of the indoor unit 2. Yes. Therefore, it is possible to prevent condensation from forming on the radiation panel 30 provided on the front surface of the indoor unit 2.

  Furthermore, in the air conditioner 1 of this embodiment, the auxiliary heat exchanger 37 is provided so that the airflow generated by the indoor fan 21 is supplied. Therefore, the indoor fan 21 facing the indoor heat exchanger 20 can be used for the auxiliary heat exchanger 37 without separately providing a fan for the auxiliary heat exchanger 37.

  In addition, in the air conditioner 1 of the present embodiment, the auxiliary heat exchanger 37 is stacked on the rear heat exchanger 20 b of the indoor heat exchanger 20. Therefore, the air flow generated by the indoor fan 21 can be reliably supplied to the auxiliary heat exchanger 37.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes meanings equivalent to the scope of claims for patent and all modifications within the scope.

  In the above-described embodiment, the case where the auxiliary heat exchanger 37 is provided so as to be supplied with the air flow generated by the indoor fan 21 facing the indoor heat exchanger 20 is described, but the present invention is not limited thereto. . In addition to the indoor fan 21, a fan that supplies an air flow to the auxiliary heat exchanger 37 may be separately provided.

  In addition, in the above-described embodiment, the case where the auxiliary heat exchanger 37 is stacked on the rear heat exchanger 20b of the indoor heat exchanger 20 has been described, but the present invention is not limited to this. The auxiliary heat exchanger 37 may be stacked on the front heat exchanger 20 a of the indoor heat exchanger 20. Further, the auxiliary heat exchanger 37 may be provided integrally with the indoor heat exchanger 20. Further, the auxiliary heat exchanger 37 may be arranged alone at a position where the air flow generated by the indoor fan 21 is supplied.

  If this invention is utilized, generation | occurrence | production of the dew condensation of the radiation panel (radiant heat exchanger) at the time of air_conditionaing | cooling operation and generation | occurrence | production of noise at the time of radiation heating operation can be prevented.

DESCRIPTION OF SYMBOLS 1 Air conditioner 2 Indoor unit 10 Refrigerant circuit 10a Branch part 10b Merging part 11 Main flow path 12 First flow path 13 Second flow path 20 Indoor heat exchanger 21 Indoor fan 23 Indoor electric valve (valve mechanism)
30 Radiant panel (radiant heat exchanger)
37 Auxiliary heat exchanger 60 Compressor 62 Outdoor heat exchanger 64 Outdoor electric valve (pressure reduction mechanism)

Claims (4)

An air conditioner including a compressor, an indoor heat exchanger for performing hot air heating, a radiant heat exchanger for performing radiant heating, a refrigerant circuit having a decompression mechanism and an outdoor heat exchanger,
The refrigerant circuit is
A main flow path in which a decompression mechanism, an outdoor heat exchanger and a compressor are provided in order;
During the heating operation, the branch section provided on the downstream side of the compressor in the main flow path is connected to the merging section provided on the upstream side of the decompression mechanism, and the first heat exchanger is provided with the indoor heat exchanger. A flow path;
The branch part and the junction part are connected in parallel with the first flow path and have a second flow path provided with the radiant heat exchanger,
A valve mechanism is provided between the radiant heat exchanger and the merging portion in the second flow path,
An air conditioner, wherein an auxiliary heat exchanger is provided between the radiant heat exchanger and the valve mechanism in the second flow path. The indoor heat exchanger is provided to face the fan inside the indoor unit,
The air conditioner according to claim 1, wherein the radiant heat exchanger is provided on a surface of an indoor unit.   The air conditioner according to claim 2, wherein the auxiliary heat exchanger is provided so as to be supplied with an air flow generated by the fan.   The air conditioner according to claim 3, wherein the auxiliary heat exchanger is stacked on a part of the indoor heat exchanger.

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