JP5088520B2 - Air conditioner - Google Patents

Abstract

This air conditioner appropriately controls the temperature of a radiant panel (radiant heat exchanger). The air conditioner has a compressor (60), an outdoor motor-operated valve (64), an outdoor heat exchanger (62), an indoor heat exchanger (20), and a radiant panel (30), and is provided with a refrigerant circuit (10) that is configured in a manner so that high-temperature refrigerant flows to the radiant panel (30) during a radiant heating operation. During the radiant heating operation, a panel incoming temperature sensor (25) is provided to the conduit upstream from the radiant conduit of the radiant panel (30), and a panel outgoing temperature sensor (26) is provided to the conduit downstream from the radiant conduit of the radiant panel (30). An indoor motor-operated valve control unit controls an indoor motor-operated valve (23) provided upstream from the radiant conduit of the radiant panel (30) on the basis of the temperatures detected by the panel incoming temperature sensor (25) and the panel outgoing temperature sensor (26).

Description

  The present invention relates to an air conditioner having a refrigerant circuit provided with an outdoor heat exchanger and a radiant heat exchanger.

  As an air conditioner, an indoor unit and an outdoor unit are connected and a compressor, an indoor heat exchanger, a radiant panel, a decompression mechanism, and a refrigerant circuit provided with an outdoor heat exchanger are known. (For example, refer to Patent Document 1). In the air conditioner disclosed in Patent Document 1, the radiation panel is provided with a panel temperature sensor for detecting the refrigerant inlet side temperature. Based on the temperature detected by the panel temperature sensor, the temperature of the radiation panel is controlled.

No. 7-18935

  The temperature of the refrigerant that has flowed into the radiant panel rapidly decreases due to the influence of radiation from the radiant panel and heat radiation from natural convection. Therefore, the panel temperature sensor does not detect the temperature of the refrigerant that has flowed into the radiant panel, but detects the temperature at which the refrigerant that has flowed into the radiant panel has decreased due to the effects of radiation and natural convection heat dissipation. Become. Therefore, the problem that the temperature control of a radiation panel cannot be performed appropriately arises.

  Then, the objective of this invention is providing the air conditioner which can perform temperature control of a radiation panel (radiation heat exchanger) appropriately.

An air conditioner according to a first aspect of the present invention is an air conditioner including a refrigerant circuit having a compressor, a decompression mechanism, an outdoor heat exchanger, an indoor heat exchanger, and a radiant heat exchanger, wherein the refrigerant circuit includes: The refrigerant circuit is configured to flow a high-temperature refrigerant to the radiant heat exchanger during radiant heating operation , and the refrigerant circuit includes a main flow path in which a decompression mechanism, an outdoor heat exchanger, and a compressor are sequentially provided, and during the heating operation, A first passage provided with an indoor heat exchanger and a branching portion provided on the downstream side of the compressor of the main passage and a junction provided on the upstream side of the pressure reducing mechanism; and heating operation The branching section and the merging section are connected in parallel with the first flow path, and have a second flow path provided with a radiant heat exchanger, from the radiant heat exchanger in the refrigerant circuit Temperature sensors installed in the upstream and downstream piping A motor-operated valve for adjusting a flow rate of refrigerant supplied to the radiant heat exchanger, the motor-operated valve being provided in any one of a pipe upstream and a downstream pipe from the radiant heat exchanger in the refrigerant circuit; A first temperature detected by the temperature sensor provided in the pipe upstream of the radiant heat exchanger, and a second temperature detected by the temperature sensor provided in the pipe downstream of the radiant heat exchanger; Controlled based on

  Note that “the piping upstream of the radiant heat exchanger (during the radiant heating operation)” means the piping upstream of the most upstream end of the piping constituting the radiant heat exchanger. In the radiant heating operation, the phrase “pipe on the downstream side of the radiant heat exchanger” means a pipe on the downstream side of the most downstream end of the pipe constituting the radiant heat exchanger.

  In this air conditioner, since the temperature sensor is provided in at least one of the upstream piping and the downstream piping from the radiant heat exchanger, the temperature detected by the temperature sensor is the radiation from the radiant heat exchanger and Not affected by heat dissipation due to natural convection. Therefore, the temperature control of the radiant heat exchanger can be appropriately performed.

  In this air conditioner, when the indoor heat exchanger and the radiant heat exchanger are provided in parallel, the temperature control of the radiant heat exchanger can be appropriately performed.

  In this air conditioner, the temperature of the refrigerant before flowing into the radiant heat exchanger during heating operation can be detected by a temperature sensor provided in a pipe upstream of the radiant heat exchanger in the circuit during heating operation. That is, it is possible to detect the temperature of the refrigerant before the temperature decreases due to radiation from the radiant heat exchanger. Therefore, it is possible to quickly and reliably suppress the surface temperature of the radiant heat exchanger (radiant panel) from becoming too high. In addition, by providing a functional component such as a valve in the piping downstream of the radiant heat exchanger in the circuit during the heating operation and closing the valve, the refrigerant is prevented from flowing into the radiant heat exchanger during the cooling operation. However, in this case, by providing a temperature sensor in the piping downstream of the radiant heat exchanger in the heating operation circuit and closer to the radiant heat exchanger than functional components such as valves, it is possible during cooling operation. When a refrigerant leaks from a functional component such as a valve, the leak can be detected before flowing into the radiant heat exchanger. Therefore, it is possible to detect the leakage of the refrigerant quickly and reliably, and to detect the condensation of the radiant heat exchanger. Furthermore, the predicted value of the surface temperature of the radiant heat exchanger (radiant panel) can be calculated with high accuracy based on the temperatures detected by both temperature sensors.

  In this air conditioner, by controlling the valve mechanism, the surface temperature of the radiant heat exchanger (radiant panel) derived from the first temperature and the second temperature can be adjusted to the target temperature. Therefore, the performance of the indoor heat exchanger is not affected unlike the case where the surface pressure of the radiant heat exchanger is controlled by controlling the main pressure reducing mechanism.

In the air conditioner pertaining to the second invention, in the air conditioner pertaining to the first invention, the temperature sensor is a pipe upstream of the radiant heat exchanger in the second flow path during heating operation. And it is provided in the position near the said radiant heat exchanger from the said branch part.

  In this air conditioner, since the temperature of the refrigerant immediately before flowing into the radiant heat exchanger can be detected during heating operation, the surface temperature of the radiant heat exchanger (radiant panel) can be controlled with high accuracy.

An air conditioner according to a third invention is the air conditioner according to the first invention, wherein the motor-operated valve is provided in a pipe downstream of the radiant heat exchanger in the second flow path during heating operation. In the heating operation, the temperature sensor is a pipe downstream of the radiant heat exchanger in the second flow path, and is provided at a position closer to the radiant heat exchanger than the motor-operated valve . .

  In this air conditioner, since the temperature of the refrigerant immediately after flowing out of the radiant heat exchanger can be detected during heating operation, the surface temperature of the radiant heat exchanger (radiant panel) can be controlled with high accuracy.

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

  In the first invention, since the temperature sensor is provided in at least one of the upstream piping and the downstream piping from the radiant heat exchanger, the temperature detected by the temperature sensor is the radiation from the radiant heat exchanger and Not affected by heat dissipation due to natural convection. Therefore, the temperature control of the radiant heat exchanger can be appropriately performed.

In 1st invention, when an indoor heat exchanger and a radiant heat exchanger are provided in parallel, control of a radiant heat exchanger can be performed appropriately.

In 1st invention, the temperature of the refrigerant | coolant before flowing into a radiant heat exchanger at the time of heating operation can be detected with the temperature sensor provided in the piping upstream from a radiant heat exchanger in the circuit at the time of heating operation. That is, it is possible to detect the temperature of the refrigerant before the temperature decreases due to radiation from the radiant heat exchanger. Therefore, it is possible to quickly and reliably suppress the surface temperature of the radiant heat exchanger (radiant panel) from becoming too high. In addition, by providing a functional component such as a valve in the piping downstream of the radiant heat exchanger in the circuit during the heating operation and closing the valve, the refrigerant is prevented from flowing into the radiant heat exchanger during the cooling operation. However, in this case, by providing a temperature sensor in the piping downstream of the radiant heat exchanger in the heating operation circuit and closer to the radiant heat exchanger than functional components such as valves, it is possible during cooling operation. When a refrigerant leaks from a functional component such as a valve, the leak can be detected before flowing into the radiant heat exchanger. Therefore, it is possible to detect the leakage of the refrigerant quickly and reliably, and to detect the condensation of the radiant heat exchanger. Furthermore, the predicted value of the surface temperature of the radiant heat exchanger (radiant panel) can be calculated with high accuracy based on the temperatures detected by both temperature sensors.

In the first invention, by controlling the valve mechanism, the surface temperature of the radiant heat exchanger (radiant panel) derived from the first temperature and the second temperature can be adjusted to the target temperature. Therefore, the performance of the indoor heat exchanger is not affected unlike the case where the surface pressure of the radiant heat exchanger is controlled by controlling the main pressure reducing mechanism.

In 2nd invention, since the temperature of the refrigerant | coolant just before flowing into a radiant heat exchanger can be detected at the time of heating operation, the surface temperature of a radiant heat exchanger (radiant panel) can be controlled with high precision.

In 3rd invention, since the temperature of the refrigerant | coolant immediately after flowing out from a radiant heat exchanger can be detected at the time of heating operation, the surface temperature of a radiant heat exchanger (radiant panel) can be controlled with high precision.

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 which shows schematic structure of the air conditioner which concerns on embodiment of this invention, Comprising: It is a figure which shows the flow of the refrigerant | coolant at the time of a radiation heating operation and a radiation breeze 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. It is a front view which shows the state which removed the front grille and opening / closing panel of the indoor unit shown in FIG. (A) is a front view of piping arrange | positioned at the right side of the indoor heat exchanger shown in FIG. 5, (b) is a right view of (a). (A) is a front view of the radiation panel shown in FIG. 3, (b) is a top view of (a), and (c) is a rear view of (a). (A) is a rear view of the front panel part shown in FIG. 7, (b) is sectional drawing which follows the bb line of (a). It is sectional drawing which follows the IX-IX line of FIG. It is a block diagram which shows schematic structure of the control part which controls an air conditioner. It is a figure for demonstrating the control performed by the indoor motor operated valve control part shown in FIG. It is a figure which shows an example of the control performed by the control part shown in FIG. It is a circuit diagram which shows schematic structure of the air conditioner which concerns on the 1st reference example of this embodiment. It is a circuit diagram which shows schematic structure of the air conditioner which concerns on the 2nd reference example of this embodiment.

  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, the outdoor unit 6 installed outdoor, and the remote control 9 (refer FIG. 10). ing. The indoor unit 2 includes an indoor heat exchanger 20, an indoor fan 21 disposed in the vicinity of the indoor heat exchanger 20, a radiation panel 30, an indoor motor operated valve 23, and an indoor temperature sensor for detecting indoor air temperature. 24. 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. During heating operation (as will be described in detail later, when the refrigerant flows in the direction indicated by the solid line arrows in FIGS. 1 and 2 in the refrigerant circuit 10), a branching portion is formed on the downstream side of the compressor 60 in the main flow path 11. 10a is provided, and a merging portion 10b is provided at the upstream side of the outdoor motor operated valve 64. The refrigerant circuit 10 connects the branch portion 10a and the refrigerant circuit 10, and connects the first flow path 12 provided with the indoor heat exchanger 20, the branch section 10a, and the merge section 10b to the first flow path 12. And a second flow path 13 provided with a radiation panel 30.

  Piping between the radiation panel 30 and the junction 10b in the second flow path 13, that is, downstream of a radiation pipe 36c (see FIG. 8 and the like) of a radiation heat exchanger 34 (to be described later) of the radiation panel 30 during heating operation. Is provided with an indoor electric valve (valve mechanism) 23. 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 temperature sensor 25 is provided in a pipe upstream of the radiation pipe 36c of the radiation panel 30 during the heating operation. The panel temperature sensor 26 is provided in a pipe on the downstream side of the radiation pipe 36c of the radiation panel 30 during the heating operation.

  Here, as shown in FIG. 1, the length L1 from the panel temperature sensor 25 to the radiation pipe 36c of the radiation panel 30 is shorter than the length L2 from the branch portion 10a to the panel temperature sensor 25. That is, the panel entering temperature sensor 25 is provided at a position closer to the radiation pipe 36c than the branching portion 10a. The length L3 from the panel temperature sensor 26 to the radiation pipe 36c of the radiation panel 30 is shorter than the length L4 from the indoor motor-operated valve 23 to the panel temperature sensor 26. That is, the panel temperature sensor 26 is provided at a position closer to the radiation pipe 36 c than 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.

  As will be described in detail later, the radiation panel 30 is disposed on the surface side of the indoor unit 2 and includes a panel pipe 36 (see FIG. 8 and the like) 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 air conditioner 1 of the present embodiment can perform a cooling operation, a hot air heating operation, a radiant heating operation, and a radiant light wind 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 radiant light breeze heating operation is an operation of performing radiant heating by flowing a refrigerant through the radiant panel 30 while performing warm air heating with a fixed air volume that is lower than that during the warm air heating operation and during the radiant heating operation.

  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 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.

  During the radiant heating operation and the radiant breeze 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 the solid arrows in FIG. 2, the high-temperature and high-pressure refrigerant discharged from the compressor 60 passes through the four-way switching valve 61 and flows into the indoor heat exchanger 20 and the radiation panel 30. Then, the refrigerant condensed in the indoor heat exchanger 20 and the radiation panel 30 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, internal devices such as the indoor fan 21, the indoor heat exchanger 20, the air outlet unit 46, and the electrical component unit 47 housed in the casing 4, and the front surface. A grill 42 is 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. As shown in FIG. 4, the upper end of the front heat exchanger 20 a is located above the upper end of the indoor fan 21. The back heat exchanger 20 b is disposed below 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.

  As shown in FIG. 6, on the right side of the indoor heat exchanger 20 in a front view, a pipe for supplying the refrigerant sent from the outdoor unit 6 to the indoor heat exchanger 20 and the radiation panel 30 is an indoor heat exchange. It is provided integrally with the vessel 20. In addition, as shown in FIG. 5, the drip-proof cover 45 is attached ahead of these piping.

  As shown to Fig.6 (a), in the right end part of the indoor unit 2, the 1st connection part 15 connected with the piping of the downstream of the compressor 60 of the main flow path 11 in the circuit at the time of heating operation, and the main flow path 11 and the 2nd connection part 16 connected with the piping of the upstream of the outdoor electrically operated valve 64 are arrange | positioned. As shown in FIG. 6B, the second connection portion 16 is located obliquely above and in front of the first connection portion 15.

  Further, as shown in FIG. 6A, on the left side of the first connection portion 15 and the second connection portion 16, as will be described later, panel piping 36 (FIG. 8 etc.) provided integrally with the radiation panel 30 is provided. The third connection portion 17 and the fourth connection portion 18 connected to both ends of the reference are disposed. The fourth connection portion 18 is located obliquely below and to the left of the third connection portion 17.

  The pipe extending from the first connection portion 15 is connected to a branch pipe that functions as the branch portion 10a. From the branch pipe, pipes respectively constituting the first flow path 12 provided with the indoor heat exchanger 20 and the second flow path 13 provided with the radiation panel 30 extend. In the indoor heat exchanger 20 of the present embodiment, the refrigerant flows from the branch pipe into the indoor heat exchanger 20 via a plurality of pipes, and from the indoor heat exchanger 20 to the junction 10b via the plurality of pipes. Is configured to flow. Thus, the 1st flow path 12 is comprised by the some piping which connects between the branch part 10a and the confluence | merging part 10b via the indoor heat exchanger 20. FIG. A pipe constituting the second flow path 13 extending from the branch pipe is connected to the third connection portion 17. This pipe is curved in a substantially U shape in the vicinity of the third connection portion 17, and a panel temperature sensor 25 is attached to the curved portion. That is, the panel input temperature sensor 25 is disposed in the vicinity of the third connection portion 17.

  The piping which comprises the 2nd flow path 13 extended from the 4th connection part 18 is connected to the junction pipe which functions as the junction part 10b. This pipe is curved in a substantially U shape in the vicinity of the fourth connecting portion 18, and a panel temperature sensor 26 is attached to the curved portion. That is, the panel temperature sensor 26 is disposed in the vicinity of the fourth connection portion 18. An indoor motor operated valve 23 is interposed between the fourth connecting portion 18 and the junction pipe. In the junction part 10b, the 1st flow path 12 and the 2nd flow path 13 merge. The pipe from the junction pipe is connected to the second connection portion 16.

  As shown by the arrows in FIG. 6, the refrigerant sent from the outdoor unit 6 during the radiant heating operation or the radiant breeze heating operation flows in from the first connection portion 15 and passes through the merging portion 10b and the first flow path 12 and It flows into the second flow path 13. The refrigerant that has flowed into the second flow path 13 flows into the panel piping 36 of the radiation panel 30 via the third connection portion 17. Then, the refrigerant that has flowed out of the panel pipe 36 flows in from the fourth connecting portion 18, flows out of the second connecting portion 16 through the indoor motor-operated valve 23 and the merging portion 10 b.

  As shown in FIG. 5, a drain pan 22 extending in the left-right direction is disposed below the indoor heat exchanger 20. When viewed from the front, the left end of the drain pan 22 is in a position substantially facing the end of the indoor heat exchanger 20, and the right end is opposed to a pipe disposed on the right side of the indoor heat exchanger 20. In position. Further, as shown in FIG. 4, the end portion of the drain pan 22 in the front-rear direction is substantially opposite to the end portion of the indoor heat exchanger 20 in the front-rear direction.

  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 blower outlet unit 46 includes a horizontal flap 46a disposed in the vicinity of the blower outlet 4d. The horizontal flap 46a changes the airflow direction of the airflow blown from the air outlet 4d and opens and closes the air outlet 4d.

  As shown in FIG. 5, the electrical component unit 47 is disposed below the drain pan 22, and includes an electrical component box 47a for accommodating a circuit board (not shown) and the like, and a substrate accommodated in the electrical component box 47a. And a terminal block 47b to be electrically connected. The electrical component box 47a is disposed at a position substantially facing the right half of the indoor heat exchanger 20, and the terminal block 47b is disposed at a position facing the piping disposed on the right side of the indoor heat exchanger 20. Yes. Also, the wiring drawn out from the electrical component unit 47 is routed straight upward from the right side of the terminal block 47b, and the power button 48 provided at the upper right end of the front panel 5 and the LED light emitter of the light emitting display unit 49 are provided. It is connected.

  As described above, the front grille 42 covers the main body frame 41 so as to cover the main body frame 41 to which internal devices such as the indoor heat exchanger 20, the indoor fan 21, the outlet unit 46, and the electrical component unit 47 are attached. Attached to. 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. Here, let L be the length in the vertical direction of the front panel portion 51a.

  The radiation panel 30 has a substantially rectangular shape that is long on the left and right. As shown in FIGS. 7, 8, and 9, the radiation panel 30 mainly includes an aluminum radiation plate 31 and a resin heat insulating cover 32 attached to the back surface of the radiation plate 31. The length of the radiating plate 31 in the vertical direction is almost twice that of the front panel portion 51 a of the outlet cover 51. That is, as shown in FIG. 3, the vertical length of the radiation plate 31 is about 2L. The radiation plate 31 is located below the front panel portion 51 a of the outlet cover 51. As shown in FIG. 4, a substantially central portion in the vertical direction of the radiation panel 30 faces the upper end of the front heat exchanger 20a. Further, a panel pipe 36 which is a part of the pipe constituting the refrigerant circuit 10 is attached to the rear surface of the radiation plate 31.

  As shown in FIG. 7A, both end portions of the panel pipe 36 are located below the right end portion of the radiation plate 31 in a front view. And as above-mentioned, the connection parts 36a and 36b respectively connected to the 3rd connection part 17 and the 4th connection part 18 of the pipe | tube arrange | positioned at the right side of the indoor heat exchanger 20 at the both ends of the panel piping 36. Is provided. The refrigerant sent from the outdoor unit 6 flows into the panel pipe 36 through the connection part 36a and flows out of the panel pipe 36 through the connection part 36b.

  As indicated by a broken line in FIG. 7A, a radiation pipe 36c having a substantially U-shape opened to the right side is provided at a portion of the panel pipe 36 that faces the back surface of the radiation plate 31. More specifically, the radiation pipe 36c has two linear portions extending vertically along the left-right direction, and the left ends of these linear portions are connected to each other to form a substantially U shape. ing. And the right side edge part of what is located above among the above-mentioned linear parts is connected to the connection part 36a, and the right side edge part of what is located below is connected to the connection part 36b. Therefore, the refrigerant that has flowed into the panel pipe 36 via the connection portion 36a flows through the linear portion located above the radiation pipe 36c from the right side to the left side when viewed from the front, and then is linearly located below. The part flows from the left side to the right side, and flows out from the connection part 36b.

  As shown in FIGS. 8A and 9, two protrusions 31 a extending in the left-right direction are formed on the back surface of the radiation plate 31. The linear portion of the radiation pipe 36c described above is embedded in the protrusion 31a. More specifically, more than half of the surface of the linear portion of the radiation pipe 36c is covered with the protrusion 31a, and the portion opposite to the radiation plate 31 side is exposed. Thus, since most of the surface of the linear part in the radiation piping 36c is covered with the protrusion 31a formed in the radiation plate 31, the heat | fever of the refrigerant | coolant which flows through the radiation piping 36c is efficiently transmitted to the radiation plate 31. be able to. As shown in FIG. 8B, the panel pipe 36 is in contact with the back surface of the radiation plate 31 in the linear portion of the radiation pipe 36c, and the radiation plate 31 is in a portion other than the linear portion of the radiation pipe 36c. Separated from the back.

  In the radiation panel 30, a part constituted by the entire radiation plate 31 and the radiation pipe 36 c is a radiation heat exchanger 34. Moreover, in the radiation panel 30, the part in which the protrusion 31a in which the linear part of the radiation pipe 36c is embedded, that is, the part where the radiation plate 31 and the panel pipe 36 are in contact is the radiation part. That is, in this embodiment, two radiation parts are provided up and down.

  A fixing portion 31b for screwing the heat insulating cover 32 is formed above the protrusion 31a positioned above and below the protrusion 31a positioned below the back surface of the radiation plate 31. The fixing portion 31b extends in the left-right direction, protrudes from the back surface of the radiation plate 31, and has a tip bent toward the protrusion 31a. The bent portion is substantially parallel to the back surface of the radiation plate 31 and a plurality of screw holes 31c for screwing the heat insulating cover 32 are formed.

  The heat insulating cover 32 is attached to the fixing portion 31b of the radiation plate 31 with screws. As shown in FIG. 9, the protrusion 31 a of the radiation plate 31 is disposed in a space formed between the back surface of the radiation plate 31 and the front surface of the heat insulating cover 32. Due to the heat insulating effect of the air in the space, heat from the radiation pipe 36 c can be prevented from being transmitted to the space outside the heat insulating cover 32. Further, as shown in FIG. 7, side panels 37 constituting the side surface of the casing 4 and attachment members 38 for attaching the radiation panel 30 to the main body frame 41 are provided at both left and right ends of the rear surface of the radiation plate 31. They are attached in order from the end side.

  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, and the length in the up-down direction is approximately four times that of the front panel portion 51 a of the outlet cover 51. That is, as shown in FIG. 3, the length of the open / close panel 52 in the vertical direction is about 4L. 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.

  As described above, the front panel 5 includes the front panel portion 51 a provided on the outlet cover 51, the radiation plate 31 provided on the radiation panel 30, and the open / close panel 52. And between the radiation board 31 of the radiation panel 30, and the opening-and-closing panel 52, the auxiliary | assistant suction inlet 4b which is a slit-shaped opening extended in the left-right direction is formed. An auxiliary suction port 4 c that is a slit-like opening extending in the left-right direction is also formed near the upper end of the open / close panel 52. As shown in FIG. 3, the distance in the vertical direction between the upper end of the open / close panel 52 and the auxiliary suction port 4 c is L.

  That is, the vertical length of the front panel 5 is 7L, the auxiliary suction port 4b is formed at a position 3L from the upper end of the front panel 5, and the auxiliary suction port 4c is formed at a position 3L from the lower end of the front panel 5. Has been. That is, the auxiliary suction ports 4 b and 4 c are provided in the central region of the front panel 5 in the vertical direction. Further, as shown in FIG. 4, the auxiliary suction ports 4b and 4c are opposed to the front heat exchanger 20a.

<Assembly procedure of indoor unit 2>
Here, a procedure for assembling the indoor unit 2 configured as described above will be described.
First, internal devices such as the indoor fan 21, the indoor heat exchanger 20, the air outlet unit 46, and the electrical component unit 47 are attached to the main body frame 41. At this time, the pipe provided integrally with the indoor heat exchanger 20 as described above is arranged on the right side of the indoor heat exchanger 20 attached to the main body frame 41 as viewed from the front. And the panel incoming temperature sensor 25 and the panel outgoing temperature sensor 26 at the front-end | tip of the wiring (not shown) extended | stretched from the electrical component unit 47 are attached to this piping.

  Subsequently, the radiation panel 30 is attached to the main body frame 41. And connection part 36a, 36b of the panel piping 36 provided integrally with the radiation panel 30 is connected to the 3rd connection part 17 and the 4th connection part 18 of piping provided integrally with the indoor heat exchanger 20. . Thereafter, the blower outlet cover 51 is attached above the radiant panel 30, and the front grill 42 and the open / close panel 52 are sequentially attached below the radiant panel 30.

  When disassembling the indoor unit 2 for repair or maintenance, the procedure is reverse to the above assembly procedure. That is, for example, when removing the radiation panel 30, first, after removing the blower outlet cover 51, the open / close panel 52, and the front grille 42, the radiation panel 30 is removed.

  Here, as described above, the panel incoming temperature sensor 25 and the panel outgoing temperature sensor 26 are arranged in a pipe provided integrally with the indoor heat exchanger 20. Therefore, even if the radiation panel 30 is removed, the panel entry temperature sensor 25 and the panel exit temperature sensor 26 do not move unless the indoor heat exchanger 20 is removed from the main body frame 41. When the sensor is attached to the panel piping 36 of the radiation panel 30, it is necessary to attach and detach the sensor wiring every time the radiation panel 30 is attached / detached. Will not occur.

<Remote control 9>
In the remote controller 9, the user starts / stops the operation, sets the operation mode, sets the indoor temperature target temperature (indoor set temperature), and sets the blowout air volume for the air conditioner 1 configured as described above. Settings are made. During the warm air heating operation and the cooling operation, “air volume automatic” or “strong” to “weak” can be selected as the air volume setting. In the present embodiment, the air volume is automatically controlled during the radiant heating operation and the radiant light wind heating operation.

<Control unit 7>
Next, the control part 7 which controls the air conditioner 1 is demonstrated, referring FIG.
As shown in FIG. 10, the control unit 7 includes a storage unit 70, an indoor electric valve control unit 72, an indoor fan control unit 73, a compressor control unit 74, and an outdoor electric valve control unit 75. Yes.

  The storage unit 70 stores various operation settings related to the air conditioner 1, control programs, data tables necessary for executing the control programs, and the like. The operation setting includes one set by operating the remote controller 9 by the user, such as a target temperature (room setting temperature) of the room temperature, and one set in advance for the air conditioner 1. . In the air conditioner 1 of this embodiment, the target temperature range of the radiation panel 30 is set in advance to a predetermined temperature range (for example, 50 to 55 ° C.). The target temperature range of the radiation panel 30 may be set by operating the remote controller 9.

The indoor motorized valve control unit 72 controls the opening degree of the indoor motorized valve 23 by controlling the number of pulses input to a stepping motor (not shown) that drives the indoor motorized valve 23. During the cooling operation or the warm air heating operation, the indoor motor operated valve control unit 72 closes the indoor motor operated valve 23. In addition, during the radiant heating operation or during the radiant breeze heating operation, the indoor motor operated valve control unit 72 controls the opening degree of the indoor motor operated valve 23 based on the temperature of the radiant panel 30. Specifically, as shown in the following (Formula 1), the temperature Tp1 (first temperature) detected by the panel input temperature sensor 25 and the temperature Tp2 (second temperature) detected by the panel output temperature sensor 26 The predicted value of the surface temperature of the radiant panel 30 (hereinafter simply referred to as radiant panel temperature) Tp is calculated, and the radiant panel temperature Tp is adjusted to be within the panel target temperature range (for example, 50 to 55 ° C.). The opening degree of the electric valve 23 is controlled.
Tp = (Tp1 + Tp2) × A + B (Formula 1)
Note that A and B in (Equation 1) are both constants, and in this embodiment, A = 0.5 and B = 0.

Hereinafter, the control of the indoor motor-operated valve 23 during the radiant heating operation or the radiant breeze heating operation will be described in more detail.
As shown in FIG. 11, the indoor motor-operated valve control unit 72 is provided for each of the five types of zones determined according to the radiation panel temperature Tp, that is, the up zone, the non-change zone, the drooping zone, the stop zone, and the return zone. Different indoor motor-operated valves 23 are controlled. When the radiation panel temperature Tp is in the up zone, the number of pulses input to the stepping motor is increased at a ratio of DEV1 (pulse) / TEV1 (seconds), and the opening degree of the indoor motor operated valve 23 is increased. When the radiant panel temperature Tp is in the non-change zone, the number of pulses input to the stepping motor is not changed, and the opening degree of the indoor motor operated valve 23 is not changed. When the radiant panel temperature Tp is in the drooping zone, the number of pulses input to the stepping motor is reduced at a ratio of DEV2 (pulse) / TEV2 (seconds), and the opening degree of the indoor motor operated valve 23 is reduced. When the radiation panel temperature Tp is in the stop zone, the number of pulses input to the stepping motor is set to zero, and the indoor motor-operated valve 23 is closed. When the radiant panel temperature Tp has entered the stop zone, the control at the start of operation is performed when the radiant panel temperature Tp subsequently decreases to the return zone. The control at the start of operation is control for fixing the opening degree of the indoor motor operated valve 23 to a predetermined initial opening degree for a predetermined time t1.

  In the present embodiment, the ratio DEV1 (pulse) / TEV1 (seconds) when increasing the opening degree of the indoor motor-operated valve 23 in the up zone and when decreasing the opening degree of the indoor motor-operated valve 23 in the drooping zone. The ratio DEV2 (pulse) / TEV2 (second) is the same. These proportions may be different from each other.

As shown in FIG. 11 and Table 1, when the radiation panel temperature Tp is rising, when the radiation panel temperature Tp is lower than 53 ° C., the up-zone, the radiation panel temperature Tp is 53 ° C. or more, and 55 ° C. When the temperature is lower than the above, a non-change zone, and when the radiation panel temperature Tp is 55 ° C. or more and lower than 70 ° C., a drooping zone, and when the radiation panel temperature Tp is 70 ° C. or more, a stop zone. That is, when the radiant panel temperature Tp is relatively low, the indoor motorized valve control unit 72 performs control to increase the opening degree of the indoor motorized valve 23. When the radiation panel temperature Tp is relatively high and control is performed so as to decrease the opening of the indoor motor-operated valve 23, the radiation panel temperature Tp becomes very high (70). C. or higher), control is performed such that the indoor motor-operated valve 23 is closed.

  Further, after the radiant panel temperature Tp rises to 70 ° C. or higher, the indoor motor-operated valve 23 remains closed until a return zone lower than 45 ° C. is reached. On the other hand, when the radiation panel temperature Tp starts to decrease from a temperature below 70 ° C. after the radiation panel temperature Tp has risen, the drooping zone and radiation panel temperature Tp are 53 when the radiation panel temperature Tp is less than 70 ° C. and above 53 ° C. When the temperature is lower than 51 ° C. and equal to or higher than 51 ° C., the non-change zone is obtained.

The indoor fan control unit 73 controls the rotation speed of the indoor fan 21.
During the automatic air volume operation during the warm air heating operation or the cooling operation, or during the radiant heating operation, the indoor fan control unit 73 determines the indoor fan 21 based on the indoor temperature or the indoor set temperature detected by the indoor temperature sensor 24. Control the number of revolutions. Also, in the warm air heating operation or the cooling operation, when “strong” to “weak” is set as the air volume setting, or during the radiant light air heating operation, the indoor speed is set to the rotation speed corresponding to each preset fan tap. The fan 21 is controlled.

  The compressor control unit 74 controls the operating frequency of the compressor 60 based on the indoor temperature, the indoor set temperature, the heat exchange temperature detected by the indoor heat exchange temperature sensor 27, and the like.

  The outdoor electric valve control unit 75 controls the opening degree of the outdoor electric valve 64. Specifically, the opening degree of the outdoor motor operated valve 64 is controlled so that the temperature detected by the discharge temperature sensor 66 becomes the optimum temperature in the operating state. The optimum temperature is determined based on a calculated value using the indoor heat exchange temperature, the outdoor heat exchange temperature, or the like.

<Example of control by the control unit 7>
Referring to FIG. 12, when the air conditioner 1 is controlled by the control unit 7, a change in room temperature, a change in the rotational speed of the indoor fan 21, a change in the radiant panel temperature Tp, and an opening of the indoor motor operated valve 23. An example of the change in the degree and the change in the operating frequency of the compressor 60 will be described. In addition, the example shown in FIG. 12 is a case where it drive | operates in the mode which switches a radiation heating operation and a radiation breeze heating operation according to room temperature.

  First, after the operation is started, the operation frequency of the compressor 60 is increased step by step until the time t1. At this time, the opening degree of the indoor motor operated valve 23 is fixed to a predetermined initial opening degree. Thereby, room temperature and radiation panel temperature Tp rise. When the radiation panel temperature Tp is 55 ° C. or higher, the opening degree of the indoor motor operated valve 23 is controlled to decrease. In addition, after time t2, the rotational speed of the indoor fan 21 is reduced stepwise, and the rotational speed becomes c1 at time t3. After time t3, the rotational speed of the indoor fan 21 is fixed at c1. In addition, it is a radiant heating operation from the time of an operation start to time t3, and after time t3, it switches to a radiant breeze heating operation.

  After time t4, the operating frequency of the compressor 60 is lowered stepwise so as to bring the room temperature above the indoor set temperature close to the set temperature. Thereby, radiation panel temperature Tp falls. Therefore, after time t5, the opening degree of the indoor motor-operated valve 23 is controlled so as to increase the radiation panel temperature Tp to within the target temperature range.

<Characteristics of the air conditioner 1 of the present embodiment>
In the air conditioner 1 of the present embodiment, the refrigerant circuit 10 that connects the indoor unit 2 and the outdoor unit 6 is connected in parallel with the first flow path 12 in which the indoor heat exchanger 20 is provided, and also radiates. It has the 2nd flow path 13 in which the panel 30 was provided. In the circuit during the heating operation, the panel temperature sensor 25 is provided in a pipe upstream of the radiation pipe 36c of the radiation heat exchanger 34 in the radiation panel 30 provided in the second flow path 13, and the radiation pipe 36c. A panel temperature sensor 26 is provided on the downstream side of the pipe. In other words, the panel input temperature sensor 25 is located at the most upstream side of the two radiating parts included in the radiant heat exchanger 34 during heating operation (that is, above the radiating plate 31 and the radiating pipe 36c). The portion in contact with the straight portion to be provided in the pipe on the upstream side. In addition, the panel temperature sensor 26 has a radiation portion that is located on the most downstream side during heating operation (that is, the radiation plate 31 and the linear portion located below the radiation pipe 36c in contact with each other). It is provided in the pipe on the downstream side of the portion).
Therefore, the temperatures detected by the panel entrance temperature sensor 25 and the panel exit temperature sensor 26 are not affected by radiation from the radiant heat exchanger 34 and heat radiation due to natural convection. Therefore, the temperature control of the radiation panel 30 can be performed appropriately.
Further, the panel temperature sensor 25 can detect the temperature of the refrigerant before flowing into the radiation pipe 36c of the radiation heat exchanger 34 in the radiation panel 30 during the heating operation. That is, it is possible to detect the temperature of the refrigerant before the temperature decreases due to radiation from the radiant heat exchanger 34. Therefore, it is possible to quickly and accurately suppress the radiant panel 30 from becoming too hot.
Furthermore, during the cooling operation, the indoor motor-operated valve 23 is closed to prevent the refrigerant from flowing into the radiation pipe 36c of the radiation panel 30. However, even if the refrigerant leaks from the indoor motor-operated valve 23, The leak can be detected before flowing into the radiation pipe 36c of the radiation panel 30 by the panel temperature sensor 26 disposed between the valve 23 and the radiation pipe 36c of the radiation panel 30. Therefore, the leakage of the refrigerant can be detected quickly and accurately, and the condensation of the radiation panel 30 can be detected.
In addition, the predicted value of the temperature of the radiation panel 30 can be calculated with high accuracy based on the temperatures detected by the panel entrance temperature sensor 25 and the panel exit temperature sensor 26, respectively.

  Moreover, the air conditioner 1 of this embodiment has the indoor motor operated valve 23 provided in piping downstream from the radiation piping 36c of the radiation panel 30 at the time of heating operation, and the indoor motor operated valve 23 is The temperature Tp1 detected by the panel entry temperature sensor 25 provided in the pipe upstream of the radiation pipe 36c and the temperature Tp2 detected by the panel output temperature sensor 26 provided in the pipe downstream of the radiation pipe 36c. Controlled based on. Therefore, the indoor electric valve 23 is controlled so that the radiation panel temperature Tp derived from the temperature Tp1 detected by the panel input temperature sensor 25 and the temperature Tp2 detected by the panel output temperature sensor 26 becomes the target temperature. it can. Therefore, the performance of the indoor heat exchanger 20 is not affected unlike the case where the outdoor electric valve 64 which is the main pressure reducing mechanism is controlled to control the radiation panel temperature Tp.

  Moreover, in the air conditioner 1 of this embodiment, the panel temperature sensor 25 is provided in the position nearer to the radiation piping 36c than the branch part 10a. Therefore, since the temperature of the refrigerant immediately before flowing into the radiation pipe 36c can be detected, the predicted value of the temperature of the radiation panel 30 can be calculated with high accuracy.

  Further, in the air conditioner 1 of the present embodiment, the panel temperature sensor 26 is provided at a position closer to the radiation pipe 36 c than the indoor electric valve 23. Therefore, since the temperature of the refrigerant immediately after flowing out from the radiation pipe 36c can be detected, the predicted value of the temperature of the radiation panel 30 can be calculated with high accuracy.

  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 refrigerant circuit 10 that connects the indoor unit 2 and the outdoor unit 6 has the second flow path 13 that is connected in parallel to the first flow path 12 in which the indoor heat exchanger 20 is provided. Although the case where the radiation panel 30 is provided in the second flow path 13 has been described, as a reference example, the indoor heat exchanger 20 and the radiation panel 30 are connected in series.

That is, as shown in FIG. 13, the refrigerant circuit 110 of the air conditioner 101 according to the first reference example of the present embodiment includes an outdoor electric valve 64, an outdoor heat exchanger 62, a compressor 60, a radiation panel 30, and an indoor The heat exchanger 20 has an annular main channel 111 connected in order. A discharge side pipe and a suction side pipe of the compressor 60 are connected to a four-way switching valve 61. Branch portions 101a and 101b are respectively provided on both sides of the radiation panel 30, and both ends of the branch flow path 112 are connected to the branch portions 101a and 101b. In addition, the branch part 101a is located between the indoor heat exchanger 20 and the radiation panel 30, and the branch part 101b is located on the opposite side to the branch part 101a with respect to the radiation panel 30. A first indoor motor operated valve 128 is provided in the branch flow path 112.

  A second indoor motor-operated valve 123 is provided between the radiation panel 30 and the branching part 101a. A panel temperature sensor 25 is provided between the branch portion 101b and the radiation pipe 36c of the radiation panel 30, and between the second indoor motor-operated valve 123 and the radiation pipe 36c of the radiation panel 30, A panel temperature sensor 26 is provided.

  In the refrigerant circuit 110, during the cooling operation, the first indoor motor-operated valve 128 is opened, the second indoor motor-operated valve 123 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. 13, 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. Further, the refrigerant evaporated in the indoor heat exchanger 20 flows into the compressor 60 through the branch flow path 112, the four-way switching valve 61, and the accumulator 65.

  During the hot air heating operation, the first indoor motor-operated valve 128 is opened, the second indoor motor-operated valve 123 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 the solid arrows in FIG. 13, 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 and the branch flow path 112. 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.

  During the radiant heating operation and the radiant breeze heating operation, the first indoor motor-operated valve 128 is closed, the second indoor motor-operated valve 123 is opened, and the four-way selector valve 61 is switched to the state shown by the solid line in FIG. It is done. Therefore, as indicated by the thick arrows in FIG. 13, the high-temperature and high-pressure refrigerant discharged from the compressor 60 passes through the four-way switching valve 61 and flows into the radiation panel 30 and then flows into the indoor heat exchanger 20. The refrigerant condensed in the radiant panel 30 and 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.

Also in the air conditioner 101 according to this reference example , the temperatures detected by the panel entrance temperature sensor 25 and the panel exit temperature sensor 26 are both from the radiant heat exchanger 34 of the radiant panel 30 as in the above-described embodiment. Not affected by radiation. Therefore, control of the radiation panel 30 can be performed appropriately.
In the reference example described above, the panel temperature sensor 25 is located upstream from the radiation pipe 36c of the radiation panel 30 in the pipe from the four-way switching valve 61 to the radiation pipe 36c of the radiation panel 30, that is, in the circuit during heating operation. What is necessary is just to be provided in the piping of the side. The panel temperature sensor 26 is provided in a pipe from the indoor heat exchanger 20 to the radiation pipe 36c of the radiation panel 30, that is, a pipe downstream of the radiation pipe 36c of the radiation panel 30 in the circuit during heating operation. It only has to be.

As shown in FIG. 14, the refrigerant circuit 210 of the air conditioner 201 according to the second reference example of the present embodiment includes an outdoor electric valve 64, an outdoor heat exchanger 62, a compressor 60, and an indoor heat exchanger 20. And the annular main flow channel 211 to which the radiation panel 30 is connected in order. That is, the positions of the indoor heat exchanger 20 and the radiation panel 30 are opposite to those of the refrigerant circuit 110 of the first modification. Similar to the refrigerant circuit 110 of the first modification, branch portions 201a and 201b are respectively provided on both sides of the radiation panel 30, and both ends of the branch flow channel 212 are connected to the branch portions 201a and 201b. . A first indoor motor operated valve 228 is provided in the branch flow path 212.

  A second indoor motor-operated valve 223 is provided between the radiation panel 30 and the branching part 201a. A panel temperature sensor 25 is provided between the branch portion 201b and the radiation pipe 36c of the radiation panel 30. Between the second indoor motor-operated valve 223 and the radiation pipe 36c of the radiation panel 30, A panel temperature sensor 26 is provided.

Also in the air conditioner 201 according to this reference example , the temperatures detected by the panel entry temperature sensor 25 and the panel exit temperature sensor 26 are both from the radiant heat exchanger 34 of the radiant panel 30 as in the above-described embodiment. Not affected by radiation. Therefore, control of the radiation panel 30 can be performed appropriately. In the reference example described above, the panel temperature sensor 25 is located upstream from the radiation pipe 36c of the radiation panel 30 in the pipe from the indoor heat exchanger 20 to the radiation pipe 36c of the radiation panel 30, that is, in the circuit during heating operation. What is necessary is just to be provided in the piping of the side. The panel temperature sensor 26 is provided in a pipe from the outdoor motor operated valve 64 to the radiation pipe 36c of the radiation panel 30, that is, a pipe downstream of the radiation pipe 36c of the radiation panel 30 in the circuit during heating operation. Just do it.

Further, in the above-described embodiment, the panel temperature sensor 25 is provided in the pipe upstream of the radiation pipe 36 c of the radiation panel 30 in the second flow path 13 during the heating operation, and the radiation of the radiation panel 30 is provided. Although the case where the panel temperature sensor 26 is provided in the pipe downstream of the pipe 36c has been described, as a reference example , the upstream side of the radiation pipe 36c of the radiation panel 30 in the second flow path 13 during the heating operation. There are some in which a temperature sensor is provided in at least one of the pipe and the downstream pipe . In the present embodiment, the indoor motorized valve control unit 72 calculates the predicted value of the temperature of the radiation panel 30 based on the calculated values of the temperatures detected by the panel inlet temperature sensor 25 and the panel outlet temperature sensor 26, respectively. In the case where there is one temperature sensor, the predicted value of the temperature of the radiation panel 30 is calculated based on the temperature detected by the one temperature sensor.

  Furthermore, in the above-described embodiment, the indoor motor-operated valve control unit 72 uses the radiation panel during the heating operation based on the temperature Tp1 detected by the panel input temperature sensor 25 and the temperature Tp2 detected by the panel temperature sensor 26. Although the case where the indoor motor-operated valve 23 provided in the downstream pipe of the 30 radiation pipes 36c is controlled has been described, the present invention is not limited to this. The indoor motor-operated valve 23 controlled by the indoor motor-operated valve control unit 72 may be provided in a pipe upstream of the radiation pipe 36c of the radiation panel 30 during the heating operation.

In the above-described embodiment, the case where the radiation panel temperature Tp is calculated by the following (Formula 1) has been described.
Tp = (Tp1 + Tp2) × A + B (Formula 1)
Tp1 is a temperature detected by the panel input temperature sensor 25, Tp2 is a temperature detected by the panel output temperature sensor 26, and constants A = 0.5 and B = 0.
The value of the above constant is not limited to this. The values of these constants A and B can be obtained by experiments.

  Moreover, although the above-mentioned embodiment demonstrated the case where the panel incoming temperature sensor 25 was provided in the position close | similar to the radiation piping 36c rather than the branch part 10a, the panel incoming temperature sensor 25 branches rather than the radiation piping 36c. It may be provided at a position close to the portion 10a.

  In addition, in the above-described embodiment, the case where the panel output temperature sensor 26 is provided at a position closer to the radiation pipe 36c than the indoor motor operated valve 23 has been described. However, the panel output temperature sensor 26 is provided from the radiation pipe 36c. May be provided at a position close to the indoor electric valve 23.

  Moreover, although the above-mentioned embodiment demonstrated the case where the panel incoming temperature sensor 25 and the panel outgoing temperature sensor 26 were provided in piping provided integrally with the indoor heat exchanger 20, it is not limited to this. That is, the panel entry temperature sensor 25 may be provided between the two linear portions included in the connecting portion 36a and the radiation pipe 36c shown in FIG. The panel temperature sensor 26 may be provided between the connecting portion 36b and the one located below the two linear portions included in the radiation pipe 36c.

  In the above-described embodiment, the radiation pipe 36c constituting the radiant heat exchanger 34 is composed of two linear portions fixed to the radiation plate 31 and a pipe between the two linear portions. Although described, it is not limited to this. That is, the entire radiation pipe 36 c may be fixed to the radiation plate 31. When the radiation pipe 36c includes a plurality of parts fixed to the radiation plate 31, the radiation pipe 36c includes a plurality of parts fixed to the radiation plate 31 and a pipe connecting them. That is, both ends of the radiation pipe 36 c are always fixed to the radiation plate 31.

  If this invention is utilized, the temperature control of a radiation panel (radiant heat exchanger) can be performed appropriately.

DESCRIPTION OF SYMBOLS 1 Air conditioner 2 Indoor unit 6 Outdoor unit 10 Refrigerant circuit 10a Branch part 10b Junction part 11 Main flow path 12 First flow path 13 Second flow path 20 Indoor heat exchanger 23 Indoor electric valve (valve mechanism)
25 Panel temperature sensor (temperature sensor)
26 Panel temperature sensor (temperature sensor)
30 Radiation panel 31 Radiation plate 34 Radiation heat exchanger 36c Radiation piping 60 Compressor 62 Outdoor heat exchanger 64 Outdoor motor-operated valve (pressure reduction mechanism)

Claims (3)

An air conditioner including a refrigerant circuit having a compressor, a decompression mechanism, an outdoor heat exchanger, an indoor heat exchanger, and a radiant heat exchanger,
The refrigerant circuit is configured to flow a high-temperature refrigerant to the radiant heat exchanger during radiant heating operation ,
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 portion provided on the downstream side of the compressor in the main flow path and the merging portion provided on the upstream side of the decompression mechanism are connected, and a first flow provided with an indoor heat exchanger is provided. Road,
During the heating operation, the branch portion and the merging portion are connected in parallel with the first flow path and have a second flow path provided with a radiant heat exchanger,
A temperature sensor provided in a pipe on the upstream side and a pipe on the downstream side of the radiant heat exchanger in the refrigerant circuit;
An electric valve that adjusts the flow rate of refrigerant supplied to the radiant heat exchanger, provided in either the upstream pipe or the downstream pipe from the radiant heat exchanger in the refrigerant circuit;
The motor-operated valve is detected by the first temperature detected by the temperature sensor provided in the pipe upstream of the radiant heat exchanger and the temperature sensor provided by the pipe downstream of the radiant heat exchanger. An air conditioner controlled based on the second temperature .   In the heating operation, the temperature sensor is a pipe upstream of the radiant heat exchanger in the second flow path, and is provided at a position closer to the radiant heat exchanger than the branch portion. The air conditioner according to claim 1. During the heating operation, the motor-operated valve is provided in a pipe downstream of the radiant heat exchanger in the second flow path,
In the heating operation, the temperature sensor is provided on a downstream side of the radiant heat exchanger in the second flow path, and is provided at a position closer to the radiant heat exchanger than the motor-operated valve. The air conditioner according to claim 1 .

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