ES2865098T3 - Air conditioning - Google Patents

Abstract

An air conditioner (1), comprising a refrigerant circuit (10) including a compressor (60), a decompression structure (64), an outdoor heat exchanger (62), an indoor heat exchanger (20) and a radiation heat exchanger (34), wherein the refrigerant circuit (10) is configured to circulate a high-temperature refrigerant through the radiation heat exchanger (34) during radiation heating operation, in wherein the refrigerant circuit (10) includes: a main channel (11) having the decompression structure (64), the outdoor heat exchanger (62) and the compressor (60) in this order; a first channel (12) provided with the indoor heat exchanger (20), which connects a branch section (10a) and a connecting section (10b), the branch section (10a) being arranged in a position that, during the heating operation, is on the side located downstream of the compressor (60) in the main channel (11), and the connecting section (10b) being arranged in a position that, during the heating operation, is on the side located upstream of the decompression structure (64); and a second channel (13) provided with the radiation heat exchanger (34), which connects the branch section (10a) and the connecting section (10b) in parallel with the first channel (12) during heating operation, characterized in that a first temperature sensor (25) is arranged in a conduit which, during heating operation, is on the side located upstream of the radiation heat exchanger (34) in the second channel (13) and a second The temperature sensor (26) is arranged in a conduit which, during the heating operation, is on the downstream side of the radiation heat exchanger (34) in the second channel (13), in which: the heating circuit The refrigerant (10) has a valve structure (23) arranged in the conduit which, during heating operation, is on the upstream side of the radiation heat exchanger (34) in the second channel (13) or in the conduit that, during the heating operation, is on the downstream side of the radiation heat exchanger (34) in the second channel (13); and the valve structure (23) is controlled as a function of a first temperature measured by the first temperature sensor (25) and a second temperature measured by the second temperature sensor (26).

Description

DESCRIPTION

Air conditioning

Technical field

The present invention relates to an air conditioner that includes a refrigerant circuit having an outdoor heat exchanger and a radiation heat exchanger.

Background of the technique

There is an air conditioner that has an indoor unit and an outdoor unit connected together, and it includes a refrigerant circuit that has a compressor, an indoor heat exchanger, a radiation panel, a decompression structure, and a heat exchanger. exterior (for example, see Japanese Patent Document No. JPH0718935U). The air conditioner described in the Japanese patent document No. JPH0718935U has a panel temperature sensor arranged in the radiation panel, the sensor being configured to measure the temperature on the side of the refrigerant inlet port. Then, depending on the temperature measured by the panel temperature sensor, the temperature of the radiation panel is controlled.

International patent application No. WO2010106771 (A1) describes an air conditioner according to the preamble of claim 1. Said air conditioner is configured in such a way that no vibrations occur during heating operation even though a refrigerant liquefied by a heat exchanger Radiation heat remains in the radiation heat exchanger and in the vicinity of an on-off valve. An air conditioner is provided with a first check valve located between a radiation heat exchanger and an on-off valve. When the on-off valve is in a closed state, the amount of liquid refrigerant present between the on-off valve and the first check valve is small and therefore even though the liquid refrigerant evaporates naturally and increase the internal pressure, vibrations are avoided due to the pressure not reaching a sufficient level to open the on-off valve. Japan Patent Document No. JPH04369327 (A) describes an air conditioner for adjusting the amount of refrigerant with a simplified structure to stabilize a freeze cycle and improve the cooling / heating capacity. Radiation cooling panel and radiation heating panel are provided. In cooling, supercooling is evaluated by means of temperature sensors arranged in the center of an outdoor heat exchanger and at an outlet according to a temperature difference between the center of the outdoor heat exchanger and the outlet. Depending on the supercooling, a solenoid valve and an expansion valve located at an outlet of the radiation heating panel are controlled, while in heating the supercooling is evaluated from a temperature difference between an inlet of the heating panel by radiation and the output that is measured by the temperature sensors arranged at the inlet and outlet of the radiation heating panel, and the expansion valves arranged at an inlet and at an outlet of the radiation cooling panel are controlled using the Supercooling evaluated.

Japanese patent document No. JPH0448140 (A) describes an air conditioner for obtaining a rapid temperature rise when operation is started and for reducing energy consumption by means of a method in which each of the options between heating operations with a single indoor heat exchanger, a parallel circuit made up of the indoor heat exchanger and a radiation heat exchanger, a series circuit made up of the radiation heat exchanger and the indoor heat exchanger , and the radiation heat exchanger, is suitably selected in response to a load. At the time of commissioning, there is a substantial difference between the indoor air temperature and the indoor air temperature set as a setpoint, so that the refrigerant discharged by a compressor is circulated through a four-way valve, a valve two-way, an indoor heat exchanger, an expansion valve and an outdoor heat exchanger, in this order, and then powerful hot air heating is carried out only with the radiation from the indoor heat exchanger. As the indoor temperature increases and the difference between it and the indoor air temperature set as a setpoint decreases, a part of the refrigerant that passes through the four-way valve passes through the two-way valve, of the exchanger radiant heat and an expansion valve, coupled with a flow of refrigerant circulating to the outdoor heat exchanger, and therefore hot air heating and radiation heating are carried out simultaneously. As the indoor air temperature approaches the setpoint indoor air temperature, the refrigerant circulates through the series circuit of the radiation heat exchanger and the indoor heat exchanger, and then heating is carried out simultaneously by hot air and radiation heating. As the indoor air temperature reaches or exceeds the indoor air temperature set as the setpoint, only radiation heating is carried out.

Compendium of the invention

Technical problem

The temperature of the refrigerant that has entered the radiation panel drops rapidly due to radiation from the radiation panel and the influences of natural convection. Therefore, the temperature measured by the panel temperature sensor is not the temperature of the refrigerant that has entered the radiation panel, but the temperature of the refrigerant circulating inside the radiation panel, which is reduced due to radiation or the influences of natural convection. This gives rise to the problem that the temperature of the radiation panel is not adequately controlled.

Taking into account the present invention, it is an object of the present invention to provide an air conditioner capable of adequately controlling the temperature of the radiation panel (radiation heat exchanger).

Technical solution

A first aspect of the present invention is an air conditioner, including a refrigerant circuit including a compressor, a decompression structure, an outdoor heat exchanger, an indoor heat exchanger, and a radiation heat exchanger, wherein The refrigerant circuit is configured to circulate a high-temperature refrigerant through the radiation heat exchanger during radiation heating operation, wherein the refrigerant circuit includes: a main channel having the decompression structure, the outdoor heat exchanger and compressor in this order; a first channel provided with the indoor heat exchanger, connecting a branch section and a connecting section, the branch section being arranged in a position that, during heating operation, is on the downstream side of the compressor in the main channel, and the connecting section being arranged in a position which, during heating operation, is on the upstream side of the decompression structure; and a second channel provided with the radiation heat exchanger, which connects the branch section and the junction section in parallel with the first channel during heating operation, in which a first temperature sensor is arranged in a conduit that, During heating operation, it is on the upstream side of the radiation heat exchanger in the second channel and a second temperature sensor is arranged in a conduit which, during heating operation, is on the downstream side of the Radiation heat exchanger in the second channel, wherein: the refrigerant circuit has a valve structure arranged in the conduit which, during heating operation, is on the upstream side of the radiation heat exchanger in the second channel or in the conduit which, during heating operation, is on the downstream side of the heat exchanger radiation heat in the second channel; and the valve structure is controlled as a function of a first temperature measured by the first temperature sensor arranged in the conduit that is on the upstream side of the radiation heat exchanger in the second channel, and a second temperature measured by the second temperature sensor arranged in the conduit that is on the downstream side of the radiation heat exchanger in the second channel.

It should be noted that the expression "conduit which (during radiation heating operation) is on the side located upstream of the radiation heat exchanger" means the conduit on the side located upstream of the end portion located more upstream of the conduits constituting the radiation heat exchanger, and that the expression "conduit which (during radiation heating operation) is on the downstream side of the radiation heat exchanger" means the conduit on the side located downstream of the end part located most downstream of the conduits that constitute the radiation heat exchanger.

The second temperature sensor of this air conditioner is arranged in the duct on the downstream side of the radiation heat exchanger and the first temperature sensor is arranged in the duct on the upstream side of the radiation heat exchanger. Therefore, the temperature measured by the temperature sensor is hardly influenced by radiation from the radiating heat exchanger or by natural convection. This enables proper temperature control of the radiation heat exchanger. The air conditioner having the indoor heat exchanger and the radiation heat exchanger arranged in parallel to each other makes possible a proper temperature control of the radiation heat exchanger.

With the first temperature sensor arranged in the duct which, during heating operation, is on the upstream side of the radiation heat exchanger, the air conditioner is able to measure the temperature of the refrigerant before it circulates inside radiation heat exchanger in the circuit during heating operation. In other words, it is possible to measure the temperature of the refrigerant before the temperature drops due to radiation from the radiating heat exchanger. Therefore, an excessively high surface temperature of the radiation heat exchanger (radiation panel) is quickly and reliably avoided. Provision of a functional part, such as a valve, in the conduit is possible which is on the downstream side of the radiation heat exchanger in the loop during heating operation. The closure of this valve or the like prevents the refrigerant from circulating inside the radiation heat exchanger during cooling operation. In this case, when the refrigerant leaks through the functional part, such as a valve, during the cooling operation, that leakage is detected before the refrigerant circulates into the radiation heat exchanger by means of the provision of a temperature sensor in the duct which, during heating operation, is on the downstream side of the radiation heat exchanger and which is in a position closer to the radiation heat exchanger than to the functional part, such as a valve. Therefore, it is possible to quickly and reliably detect refrigerant leakage and detect dew condensation on the radiation heat exchanger. Furthermore, a predicted surface temperature value of the radiation heat exchanger (radiation panel) is calculated with great precision based on the temperatures measured by the temperature sensors on both sides.

In air conditioning, the valve structure is controlled in order to adjust the surface temperature of the radiation heat exchanger (radiation panel), obtained from the first temperature and the second temperature, so that it reaches the target temperature. . Therefore, the performance of the indoor heat exchanger is not affected, unlike the cases where the decompression structure is controlled in order to control the surface temperature of the radiation heat exchanger.

Furthermore, with the air conditioning, it is possible to provide a functional part, such as a valve, in the conduit which is on the downstream side of the radiation heat exchanger in the circuit during the heating operation. The closure of this valve or the like prevents the refrigerant from circulating inside the radiation heat exchanger during cooling operation. In this case, when the refrigerant leaks through the functional part, such as a valve, during the cooling operation, that leakage is detected before the refrigerant circulates into the radiation heat exchanger by means of the provision of a temperature sensor in the duct which, during heating operation, is on the downstream side of the radiation heat exchanger and which is in a position closer to the radiation heat exchanger than to the functional part, such as a valve. Therefore, it is possible to quickly and reliably detect refrigerant leakage and detect dew condensation on the radiation heat exchanger.

With the first temperature sensor arranged in the duct which is on the upstream side of the radiation heat exchanger in the circuit during heating operation, the air conditioner is able to detect the temperature of the refrigerant before it circulates through the inside the radiation heat exchanger, during heating operation. In other words, it is possible to detect the temperature of the refrigerant before the temperature drops due to radiation from the radiation heat exchanger. Therefore, an excessively high surface temperature of the radiation heat exchanger (radiation panel) is quickly and reliably avoided.

A second aspect of the present invention is the air conditioning of the first aspect adapted so that the first temperature sensor is located in a position closer to the radiation heat exchanger than to the branch section.

The air conditioner is capable of detecting the temperature of the refrigerant immediately before it circulates inside the radiation heat exchanger, during heating operation. Therefore, the surface temperature of the radiation heat exchanger (radiation panel) is controlled with great precision. A third aspect of the present invention is the air conditioning of the first or second aspect adapted so that the valve structure is arranged in the conduit which, during heating operation, is on the downstream side of the radiation heat exchanger. in the second channel, and so that the second temperature sensor is located closer to the radiation heat exchanger than to the valve structure.

The air conditioner is capable of detecting the temperature of the refrigerant immediately after it exits out of the radiation heat exchanger, during heating operation. Therefore, the surface temperature of the radiation heat exchanger (radiation panel) is controlled with great precision. Advantageous effects

As described above, the present invention gives rise to the following effects.

The first aspect of the present invention relating to having the indoor heat exchanger and the radiation heat exchanger arranged in parallel with each other enables proper control of the radiation heat exchanger.

The first aspect of the present invention, with the temperature sensor arranged in the conduit that is on the upstream side of the radiation heat exchanger in the second channel of the circuit during heating operation, is capable of detecting the temperature of the refrigerant before it circulates through the inside the radiation heat exchanger, during heating operation. In other words, it is possible to detect the temperature of the refrigerant before the temperature drops due to radiation from the radiation heat exchanger. Therefore, an excessively high surface temperature of the radiation heat exchanger (radiation panel) is quickly and reliably avoided. It is possible to provide a functional part, such as a valve, in the conduit which is on the downstream side of the radiation heat exchanger in the circuit during the heating operation. The closure of this valve or the like prevents the refrigerant from circulating inside the radiation heat exchanger during cooling operation. In this case, when the refrigerant leaks through the functional part, such as a valve, during the cooling operation, that leakage is detected before the refrigerant circulates inside the radiation heat exchanger by means of the provision of a temperature sensor in the duct which, during heating operation, is on the downstream side of the radiation heat exchanger in the second channel, and which is closer to the radiation heat exchanger than at the functional part, such as a valve. Therefore, it is possible to quickly and reliably detect refrigerant leakage and detect dew condensation on the radiation heat exchanger. Furthermore, a predicted surface temperature value of the radiation heat exchanger (radiation panel) is calculated with great precision based on the temperatures measured by the temperature sensors on both sides.

With the first aspect of the present invention, the valve structure is controlled in order to adjust the surface temperature of the radiation heat exchanger (radiation panel), obtained from the first temperature and the second temperature, so that it reaches at the target temperature. Therefore, the performance of the indoor heat exchanger is not affected, unlike the cases where the decompression structure is controlled in order to control the surface temperature of the radiation heat exchanger. With the first aspect of the present invention, it is possible to provide a functional part, such as a valve, in the conduit which is on the downstream side of the radiation heat exchanger in the circuit during heating operation. The closure of this valve or the like prevents the refrigerant from circulating inside the radiation heat exchanger during cooling operation. In this case, when the refrigerant leaks through the functional part, such as a valve, during the cooling operation, that leakage is detected before the refrigerant circulates inside the radiation heat exchanger by means of the provision of a temperature sensor in the duct which, during heating operation, is on the downstream side of the radiation heat exchanger and which is in a position closer to the radiation heat exchanger than to the functional part, such as a valve. Therefore, it is possible to quickly and reliably detect refrigerant leakage and detect dew condensation on the radiation heat exchanger.

The first aspect of the present invention, with the temperature sensor arranged in the conduit which is on the upstream side of the radiation heat exchanger in the circuit during heating operation, it is capable of detecting the temperature of the refrigerant before circulating inside the radiation heat exchanger, during heating operation. In other words, it is possible to detect the temperature of the refrigerant before the temperature drops due to radiation from the radiation heat exchanger. Therefore, an excessively high surface temperature of the radiation heat exchanger (radiation panel) is quickly and reliably avoided.

The second aspect of the present invention is capable of detecting the temperature of the refrigerant immediately before it circulates inside the radiation heat exchanger, during the heating operation. Therefore, the surface temperature of the radiation heat exchanger (radiation panel) is controlled with great precision.

The third aspect of the present invention is capable of detecting the temperature of the refrigerant immediately after it exits out of the radiation heat exchanger, during the heating operation. Therefore, the surface temperature of the radiation heat exchanger (radiation panel) is controlled with great precision.

Brief description of the drawings

[Fig. 1] Figure 1 is a circuit diagram showing a schematic configuration of an air conditioner relating to an embodiment according to the present invention, and shows a flow of refrigerant during a cooling operation and a hot air heating operation.

[Fig. 2] Figure 2 is a circuit diagram showing a schematic configuration of the air conditioner relating to the embodiment, according to the present invention, and shows a flow of refrigerant during a radiation heating operation and a radiation breeze heating operation .

[Fig. 3] Figure 3 is a perspective diagram of an indoor unit shown in Figure 1 and Figure 2.

[Fig. 4] Figure 4 is a cross-sectional view of the indoor unit taken along the line IV-IV shown in Figure 3.

[Fig. 5] Figure 5 is a front view of a front grille and an open / close panel of the indoor unit shown in Figure 3.

[Fig. 6] Figure 6 (a) is a front view of the ducts arranged on the right side of the indoor heat exchanger shown in Figure 5, and Figure 6 (b) is a right side view of the same as shown in Figure 6 (a).

[Fig. 7] Figure 7 (a) is a front view of the radiation panel shown in Figure 3, Figure 7 (b) is a top view of the same as shown in Figure 7 (a), and Figure 7 (c) is a rear view of the same as shown in Figure 7 (a).

[Fig. 8] Figure 8 (a) is a rear view of a front panel unit shown in Figure 7, and Figure 8 (b) is a cross-sectional view taken along line b-b of Figure 8 (a).

[Fig. 9] Figure 9 is a cross-sectional view taken along the line IX-IX of Figure 7.

[Fig. 10] Figure 10 is a block diagram showing a schematic configuration of a controller that controls air conditioning.

[Fig. 11] Figure 11 is an explanatory diagram of a control carried out by a motor-driven inner valve controller shown in Figure 10.

[Fig. 12] Figure 12 is a diagram showing an example of control carried out by the controller shown in Figure 10.

[Fig. 13] Figure 13 is a circuit diagram showing a schematic configuration of an air conditioner relating to a first modification of the embodiment.

[Fig. 14] Figure 14 is a circuit diagram showing a schematic configuration of an air conditioner relating to a second modification of the embodiment.

Description of achievements

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

<Complete setting of air conditioner 1>

As illustrated in Figures 1 and 2, the air conditioner 1 of the embodiment includes an indoor unit 2 installed in a room, an outdoor unit 6 installed outside the room, and a remote control 9 (see Figure 10 ). The indoor unit 2 includes an indoor heat exchanger 20, an indoor fan 21 arranged close to the indoor heat exchanger 20, a radiation panel 30, a motor-driven indoor valve 23, and an indoor temperature sensor 24 that measures an interior temperature. The outdoor unit 6 includes a compressor 60, a four-way valve 61, an outdoor heat exchanger 62, an outdoor fan 63 arranged proximate to the outdoor heat exchanger 62, and a motor-driven outdoor valve 64 (a decompression structure ).

The air conditioner 1 includes a refrigerant circuit 10 that connects the indoor unit 2 and the outdoor unit 6 to each other. The refrigerant circuit 10 includes a main channel 11 in which the external motor-driven valve 64, the external heat exchanger 62 and the compressor 60 are arranged sequentially. An intake side conduit and a discharge side conduit of the compressor 60 are connected to the four-way valve 61. A branch section 10a is arranged in a part that turns out to be the downstream side of the compressor 60 in the main channel 11 during a heating operation (as described later, when a refrigerant circulates in a direction indicated by a solid line arrow in Figures 1 and 2 in the refrigerant circuit 10), and a junction section 10b is arranged in a part that turns out to be the upstream side of the motor-driven external valve 64. The refrigerant circuit 10 further includes a first channel 12 and a second channel 13. The first channel 12 connects the branch section 10a and the refrigerant circuit 10 to each other, and the indoor heat exchanger 20 is arranged in the first channel 12. The second channel 13 is connected in parallel with the first channel 12 between the branch section 10a and the connecting section 10b, and the radiation panel 30 is arranged in the second channel 13.

A motor-driven inner valve 23 (valve structure) is arranged between the radiation panel 30 and the connecting section 10b in the second channel 13; that is, in the conduit located downstream of the radiation conduit 36c (see Figure 8 or similar) of the radiation heat exchanger 34 of the radiation panel 30. A first sensor or temperature sensor inlet of the panel 25 and a second panel 26 outlet temperature sensor or sensor is attached to both sides of radiation panel 30 in second channel 13. More specifically, panel 25 inlet temperature sensor is arranged in a duct and is on the side located upstream of a radiation conduit 36c of radiation panel 30 during heating operation. The panel outlet temperature sensor 26 is disposed in the conduit and is on the downstream side of the radiation conduit 36c from the radiation panel 30 during heating operation.

As shown in Figure 1, a length L1 that goes from the inlet temperature sensor of the panel 25 to the radiation conduit 36c of the radiation panel 30 is shorter than a length L2 that goes from the branch section 10a to the inlet temperature sensor of the panel 25. That is, the inlet temperature sensor of the panel 25 is located in a position closer to the radiation conduit 36c than to the branch section 10a. In addition, a length L3 that goes from the outlet temperature sensor of the panel 26 to the radiation conduit 36c of the radiation panel 30 is shorter than a length L4 that goes from the internal motor-driven valve 23 to the temperature sensor. outlet of panel 26. That is, the outlet temperature sensor of panel 26 is located closer to the radiation conduit 36c than to the internal motor-operated valve 23.

In the refrigerant circuit 10, an accumulator 65 is interposed between an intake side of the compressor 60 and the four-way valve 61, and a discharge temperature sensor 66 is fixed in a position between a discharge side of the compressor 60 and the four-way valve 61. An outdoor heat exchanger temperature sensor 68 is attached to the outdoor heat exchanger 62.

The indoor heat exchanger 20 includes the duct, which constitutes a part of the refrigerant circuit 10, and a temperature sensor of the indoor heat exchanger 27 is attached to the indoor heat exchanger 20. The indoor heat exchanger 20 is arranged in the windward side of indoor fan 21. Air heated or cooled by heat exchange with indoor heat exchanger 20 is blown as hot air or cold air into the room by indoor fan 21, thus conducting heating by hot air or cooling. As described in detail below, the radiation panel 30 is arranged on a surface side of the indoor unit 2, and includes a panel duct 36 (see Figure 8 and the like), which constitutes a part of the Refrigerant circuit 10. The heat of the refrigerant circulating in the duct is radiated into the room to carry out radiation heating. The motor-driven inner valve 23 is arranged in order to adjust a flow rate of the refrigerant supplied to the radiation panel 30.

The air conditioner 1 of the present embodiment is capable of carrying out a cooling operation, a hot air heating operation, a radiation heating operation and a radiation breeze heating operation. The cooling operation is an operation to carry out the cooling by causing the refrigerant to circulate not through the radiation panel 30, but through the indoor heat exchanger 20, and the hot air heating operation is an operation to carry out the heating by hot air by causing the refrigerant to circulate not through the radiation panel 30, but through the indoor heat exchanger 20. The radiation heating operation is an operation to carry out the radiation heating that causes the refrigerant to circulate through the radiation panel 30, while also causing the refrigerant to circulate through the indoor heat exchanger 20 to carry out heating by hot air. Radiation breeze heating operation is an operation that performs hot air heating with a fixed air flow lower than that of hot air heating operation and radiation heating operation, while simultaneously causes the refrigerant to flow through the radiation panel 30 to carry out radiation heating operation.

The motor-operated inner valve 23 is arranged in order to adjust a flow rate of the refrigerant supplied to the radiation panel 30. During the cooling operation mode, the motor-driven inner valve 23 is closed, and the four-way valve 61 is switched to a state indicated by a broken line in Figure 1. Therefore, as indicated by Through a dashed line arrow in Figure 1, the high-temperature, high-pressure refrigerant discharged by the compressor 60 circulates through the outdoor heat exchanger 62 through the four-way valve 61. The refrigerant condensed by the heat exchanger Outside heat 62 circulates through the inside heat exchanger 20 after being decompressed by means of the motor-operated outside valve 64. The refrigerant vaporized by the inside heat exchanger 20 circulates through the compressor 60 through the four-way valve. 61 and accumulator 65.

During hot air heating operation, the motor-driven indoor valve 23 is opened and the four-way valve 61 is switched to a state indicated by the solid line in Figure 1. Therefore, as indicated by In the middle of the solid line arrow in Figure 1, the high-temperature, high-pressure refrigerant discharged by the compressor 60 circulates inside the indoor heat exchanger 20 through the four-way valve 61. The condensed refrigerant in the Indoor heat exchanger 20 circulates inside the outdoor heat exchanger 62 after it has been depressurized by means of the motor-driven outdoor valve 64. The refrigerant vaporized by the outdoor heat exchanger 62 circulates through the compressor 60 through the four-way valve 61 and accumulator 65.

During the radiation heating operation mode and the radiation breeze heating operation, the motor-driven inner valve 23 is opened, and the four-way valve 61 is switched to a state indicated by a solid line in Figure 2. Therefore, as indicated by a solid line arrow in Figure 2, the high-temperature, high-pressure refrigerant discharged by compressor 60 circulates through indoor heat exchanger 20 and radiation panel 30. through the four-way valve 61. The refrigerant condensed by the indoor heat exchanger 20 and the radiation panel 30 circulates through the outdoor heat exchanger 62 after being decompressed by the outdoor valve actuated by engine 64. Refrigerant vaporized by outdoor heat exchanger 62 circulates through compressor 60 through four-way valve 61 and accumulator 65.

<Indoor unit 2 setting>

Next, a configuration of the indoor unit 2 will be described. As illustrated in Figure 3, the indoor unit 2 of the embodiment has a rectangular solid shape as a whole, and is installed close to the floor surface of the building. the room. In the embodiment, the indoor unit 2 is fixed to the surface of a wall, while floating with respect to the floor surface by approximately 10 cm. Hereinafter, a direction that the indoor unit 2 protrudes from the wall to which it is attached is referred to as "front", and the opposite direction is referred to as "rear". A right-left direction in Figure 3 is referred to simply as "horizontal direction", and an up-down direction is referred to simply as "vertical direction".

As illustrated in Figure 4, the indoor unit 2 primarily includes a housing 4, internal devices, such as the indoor fan 21, the indoor heat exchanger 20, an outlet unit 46, and an electrical component unit. 47, which are housed in the casing 4, and a front grille 42. As described in detail below, the casing 4 includes a main inlet 4a formed in a lower wall of the casing 4 and auxiliary inlets 4b and 4c which are formed in a front wall of the casing 4. An outlet 4d is formed in an upper wall of the casing 4. In the indoor unit 2, when driving the indoor fan 21, at the same time the air is sucked in from the proximity of the ground surface through the main inlet 4a, air is drawn in through the auxiliary inlets 4b and 4c. The indoor heat exchanger 20 heats or cools the sucked air in order to carry out conditioning. The already conditioned air is then blown through outlet 4d and returned to the room.

The housing 4 includes a chassis frame 41, an outlet cover 51, the radiation panel 30 and an open-close panel 52. As described in detail below, the outlet cover 51 includes a panel portion front 51 a, and radiation panel 30 includes a radiation plate 31. Front panel portion 51 a of outlet cover 51, radiation plate 31 of radiation panel 30, and open-close panel 52 are arranged such that they are aligned with each other on a front surface of the housing 4, and the front panel part 51a, the radiation plate 31, and the open-close panel 52 constitute a front panel 5. As illustrated in Figure 3, a power button 48 and a broadcast display part 49 indicating the operating status are arranged in an upper right end part of the front panel 5, that is, in a right end part of the front panel portion 51a of the outlet cover 51.

The frame frame 41 is fixed to a wall surface, and the frame frame 41 supports various previously described internal devices. Front grille 42, outlet cover 51, radiation panel 30, and open-close panel 52 are attached to the front surface of frame frame 41, while frame frame 41 supports the internal devices. The outlet cover 51 is fixed to an upper end portion of the frame frame 41, and the outlet 4d, which is a long horizontal rectangular opening, is formed in the upper wall of the outlet cover 51. The radiation panel 30 is fixed under the outlet cover 51, and the open-close panel 52 is fixed under the radiation panel 30. The main inlet 4a which is the long horizontal opening is formed between a lower front end of the frame frame 41 and a lower end of the opening-closing panel 52.

Each of the internal devices housed in the casing 4 will now be described.

The indoor fan 21 is arranged slightly above a middle portion according to a height direction of the casing 4 so that an axial direction of the indoor fan 21 is aligned with the horizontal direction. The indoor fan 21 sucks the air from the lower front part and blows the air towards the upper rear part.

The indoor heat exchanger 20 is arranged substantially in parallel with the front panel 5. The indoor heat exchanger 20 includes a front heat exchanger 20a that is oriented towards the rear surface of the front panel 5 and a rear heat exchanger 20b inclined towards up and towards the rear surface from an area near the lower end portion of the front heat exchanger 20a. The front surface heat exchanger 20a is arranged on the front side of the indoor fan 21, and the upper half thereof faces the indoor fan 21. As shown in Figure 4, the upper end of the heat exchanger The front surface heat exchanger 20a is located at a higher position than the position of the upper end of the indoor fan 21. The rear surface heat exchanger 20b is arranged below the indoor fan 21. That is, the indoor heat exchanger 20 as a whole It is substantially V-shaped, and is arranged in such a way that it faces the front and bottom side of the indoor fan 21.

As illustrated in Figure 6, when viewed from the front, the ducts are arranged integrally with the indoor heat exchanger 20 on the right side of the indoor heat exchanger 20 in order to supply the refrigerant sent from outdoor unit 6 to indoor heat exchanger 20 and control panel radiation 30. As illustrated in Figure 5, a drip resistant cover 45 is attached in front of the conduits.

As illustrated in Figure 6 (a), a first connection part 15 and a second connection part 16 are arranged at the right end part of the indoor unit 2. During heating operation, the first connection part Connection 15 is connected to the conduit constituting the channel on the downstream side of the compressor 60 in the main channel 11, and the second connecting part 16 is connected to the conduit constituting the channel on the upstream side of the actuated external valve. by motor 64 in the main channel 11. As shown in Figure 6 (b), the second connection part 16 is arranged obliquely above the first connection part 15.

A third connection part 17 and a fourth connection part 18 are arranged on the left sides of the first connection part 15 and the second connection part 16. As described below, the third connection part 17 and the fourth connecting part 18 are connected to both ends of panel conduit 36 (see Figure 8 and the like) which is integrally disposed with radiation panel 30, respectively. The fourth connection part 18 is arranged obliquely below the third connection part 17.

The conduit extending from the first connection part 15 is connected to a branch conduit that behaves like the branch section 10a. The ducts, which constitute the first channel 12 having the indoor heat exchanger 20 and the second channel 13 having the radiation panel 30, extend from the branch duct. The indoor heat exchanger 20 of the embodiment is configured such that the refrigerant circulates through the junction section 10b from the indoor heat exchanger 20 through the plurality of conduits, while the refrigerant circulates through the indoor heat exchanger 20 from the branching conduit through the plurality of conduits. The first channel 12 is formed by the plurality of conduits that connect the branch section 10a and the connecting section 10b with each other through the indoor heat exchanger 20. The conduit, which extends from the branch conduit and constitutes the second Channel 13, is connected to the third connection part 17. The duct is curved into a substantially U-shape in the area close to the third connection part 17, and the inlet temperature sensor of the panel 25 is fixed to the part curved. That is, the inlet temperature sensor of the panel 25 is arranged near the third connection part 17.

The conduit constituting the second channel 13 extending from the fourth connecting part 18 is connected to a connecting conduit that behaves as the connecting section 10b. The conduit is curved into a substantially U-shape in the area near the fourth connection portion 18, and the panel outlet temperature sensor 26 is attached to the curved portion. That is, the panel outlet temperature sensor 26 is arranged near the fourth connection part 18. The internal motor-operated valve 23 is interposed between the fourth connection part 18 and the connection conduit 75. The first channel 12 and the second channel 13 are joined to each other in the joint section 10b. The conduit from the junction conduit is connected to the second connection part 16.

As indicated by an arrow in Figure 6, during operation in radiation heating operation or radiation breeze heating operation, the refrigerant sent from the outdoor unit 6 circulates from the first part of connection 15, and circulates through the first channel 12 and through the second channel 13 through the connecting section 10b. The refrigerant, circulating in the second channel 13, circulates in the panel conduit 36 of the radiation panel 30 through the third connection part 17. The refrigerant, exiting out of the panel conduit 36, circulates from the fourth connecting part 18, and exits out of the second connecting part 16 through the internal motor-operated valve 23 and the connecting section 10b.

As illustrated in Figure 5, a horizontally extending drain pan 22 is disposed below the indoor heat exchanger 20. When viewed from the front, the left side end portion of the drain pan 22 it is located so as to be substantially opposite to the end portion of the indoor heat exchanger 20, and the right-side end portion is located so as to oppose the conduit provided on the right-hand side of the indoor heat exchanger 20. Such and as illustrated in Figure 4, the end portions in a front-to-back direction of the drain pan 22 are positioned so as to be substantially opposite the end portions in a front-to-rear direction of the indoor heat exchanger 20. .

The outlet unit 46 is disposed above the indoor fan 21, and guides the blown air from the indoor fan 21 to the outlet 4d formed in the upper wall of the casing 4. The outlet unit 46 includes a horizontal fin 46a disposed nearby from the 4d exit. The horizontal flap 46a opens and closes the outlet 4d while changing the vertical direction of the wind of the air that is blown through the outlet 4d.

As illustrated in Figure 5, the electrical component unit 47 is disposed below the drain pan 22, and includes an electrical component box 47a, in which a circuit board (not shown) and the like are housed. , and a termination stage 47b that is electrically connected to the board housed in the electrical component box 47a. The electrical component box 47a is arranged in the position substantially opposite the right half of the indoor heat exchanger 20, and the termination stage 47b is arranged in the position opposite the conduit arranged on the right side of the indoor heat exchanger 20. A wire from the electrical component unit 47 is directed directly upward from the right side of the termination stage 47b, and is connected to the power button 48 and to an LED luminous body of the emission display part 49, which are arranged in the upper right end part of the front panel 5.

As previously described, the front grille 42 is attached to the frame frame 41 in order to cover the frame frame 41 to which internal devices such as the indoor heat exchanger 20, the indoor fan 21, the output unit 46 and electrical component unit 47. More specifically, the front grill 42 is fixed to the frame frame 41 in order to cover an area from the substantially middle part in the vertical direction of the front heat exchanger 20a to the lower end of frame frame 41. Front grill 42 includes a filter retaining portion 42a and an inlet grill 42b disposed at the main inlet 4a.

A lower filter 43 and an upper filter 44 are attached to the filter retaining part 42a. As shown in Figure 4, the lower filter 43 retained by the filter retention part 42a extends downwardly from the substantially middle part according to the vertical direction of the front surface heat exchanger 20a, and the lower end part is leaning back. The lower end of the lower filter 43 is located near the rear end of the main inlet port 4a. Furthermore, the upper filter 44 extends upwardly from the substantially middle portion in the vertical direction of the front surface heat exchanger 20a. This lower filter 43 and the upper filter 44 divide the space between the front surface heat exchanger 20a and the front panel 5, with respect to the front-to-back direction.

The outlet cover 51 covers the outlet unit 46. As previously described, the outlet 4d is formed in the upper wall of the outlet cover 51. The front panel part 51a is arranged on the front surface of the outlet cover 51. The front panel portion 51a has a long horizontally rectangular shape. In this case, the length of the front panel unit 51a in the vertical direction is defined as L.

Radiation panel 30 has a substantially rectangular, horizontally long shape. As shown in Figure 7, Figure 8 and Figure 9, the radiation panel 30 primarily includes an aluminum radiation plate 31 and a heat insulating resin cover 32 attached to the rear surface of the radiation plate 31. The length of the radiation plate 31 in the vertical direction is substantially twice the length of the front panel unit 51a of the outlet port cover 51. In other words, the length of the plate radiation 31 according to the vertical direction is approximately 1L, as shown in Figure 3. The radiation plate 31 is located below the front surface panel portion 41a of the outlet port cover 41. As shown in Figure 4, the substantially middle part of the radiation panel 30 in the vertical direction faces the upper end part of the front surface heat exchanger 20a. Furthermore, the panel duct 36 which is the part of the duct constituting the refrigerant circuit 10 is fixed to the rear surface of the radiation plate 31.

As illustrated in Figure 7 (a), when viewed from the front, both end portions of panel conduit 36 are located below the right end portion of radiation plate 31. As described previously, the connection parts 36a and 36b are arranged at both ends of the panel duct 36, and connected respectively to the third connection part 17 and the fourth connection part 18 of the duct arranged on the right side of the indoor heat exchanger 20. The refrigerant sent from the outdoor unit 6 circulates in the panel conduit 36 through the connection part 36a, and exits out from the connection part 36b to the outside of the panel conduit 36.

As indicated by the dashed line in Figure 7 (a), a radiation conduit 36c substantially U-shaped and open on the right side is disposed on a part opposite the rear surface of the radiation plate. 31 in the panel conduit 36. More particularly, the radiation conduit 36c includes in the vertical direction two horizontally extending linear portions, and the left end portions of the linear portions are connected in order to form the substantially U-shape. Outside the linear parts, the extreme right part of the linear part located on the upper side is connected to the connection part 36a, and the extreme right part of the linear part located on the lower side is connected to the connection part 36b. . Therefore, when viewed from the front, the refrigerant, flowing in the panel conduit 36 through the connection part 36a, flows from the right side to the left side of the linear part located on the upper side. of the radiation conduit 36c, then circulates from the left side to the right side of the linear part located on the lower side, and exits out through the connection part 36b.

As illustrated in Figures 8 (a) and 9, two horizontally extending projections 31a are formed in the vertical direction on the rear surface of radiation plate 31. Linear portions of radiation conduit 36c described above are embedded in the projections 31a. More particularly, in each of the linear parts of the radiation conduit 36c, at least one half of the surface is covered by the projection 31a and the part that is on the side opposite the radiation plate 31 is exposed. Therefore, most of the surface of the linear parts of the radiation conduit 36c is substantially covered by the projection 31a formed on the radiation plate 31, so that the heat of the refrigerant that circulates through radiation conduit 36c can be efficiently transferred to radiation plate 31. As illustrated in Figure 8 (b), in panel conduit 36, the linear portions of radiation conduit 36c are in contact with the rear surface of the radiation plate 31, and the part other than the linear portions of the radiation conduit 36c is spaced from the rear surface of the radiation plate 31.

In the radiation panel 30, the part formed by the entire radiation plate 31 and the radiation conduit 36c constitutes the radiation heat exchanger 34. The part of the radiation panel 30 that corresponds to the sub-projections 31a in which the Linear parts of the radiation conduit 36c are nested, that is, the part where the radiation plate 31 and the panel conduit 36 are in contact with each other, are the parts that behave as a radiation unit. That is, in the present embodiment, there are two radiation units; at the top and at the bottom.

A fixing part 31b is formed above the projection 31a located at the top of the rear surface of the radiation plate 31, and the fixing part 31b is further formed below the projection 31a located at the bottom. from the rear surface of the radiation plate 31 in order to screw the heat insulating cover 32 to the rear surface of the radiation plate 31. The fixing part 31b extends along the horizontal direction, projecting from the surface rear of the radiation plate 31, and a front end of the fixing part 31b is bent towards the side of the projection 31a. The bent part is substantially parallel to the rear surface of the radiation plate 31, and a plurality of threaded holes 31c is formed in the fixing part 31b for the purpose of screwing on the heat insulating cover 32.

The heat insulating cover 32 is fixed to the fixing parts 31b of the radiation plate 31 by screws. As illustrated in Figure 9, the sub-projection 31a of the radiation plate 31 is arranged in a space formed between the rear surface of the radiation plate 31 and the front surface of the heat insulating cover 32. A The thermal insulation effect caused by the air contained in the space can suppress the transfer of heat from the radiation conduit 36c to a space located outside the heat insulating jacket 32. As illustrated in Figure 7, a side panel 37 constituting the side surface of the housing 4 and a fixing member 38 used to fix the radiation panel 30 to the truss frame 41 are fixed to each of the end parts in the horizontal direction of the rear surface of the radiation plate 31 by the end part in turn.

The opening-closing panel 52 is removably attached to the bottom of the radiation plate 31 of the radiation panel 30. The opening-closing panel 52 has a rectangular shape that is long in the horizontal direction, and its length in the vertical direction it is approximately four times the length of the front surface panel portion 51a of the outlet port cover 51. In other words, the length of the open-close panel 52 in the vertical direction is approximately 4L, as shown in Figure 3. As illustrated in Figure 4, the vertical position of the upper end of the open-close panel 52 has substantially the same level as the upper end of the front grill 42. As shown described previously, the lower end of the opening-closing panel 52 constitutes the part of the main entrance 4a. Accordingly, the front grill 42 is exposed by removing the open-close panel 52, so that the lower filter 43 and the upper filter 44, which are attached to the filter retention portion 42a of the front grill 42, can be removed.

As previously described, the front panel 5 includes the front panel portion 51a arranged on the outlet cover 51, the radiation plate 31 arranged on the radiation panel 30, and the open-close panel 52. The auxiliary inlet 4b which is the slot-shaped opening extending in the horizontal direction is formed between the radiation plate 31 of the radiation panel 30 and the open-close panel 52. The auxiliary inlet 4c which is the opening with slot shape extending in the horizontal direction is formed near the upper end of the open-close panel 52. As shown in Figure 3, the distance from the upper end of the open-close panel 52 to the auxiliary inlet port 4c in the vertical direction is L.

Therefore, the length of the front surface panel 5 in the vertical direction is 7L, and the auxiliary input port 4b is in a position 3L with respect to the upper end of the front surface panel 5, and the input port Auxiliary 4c is in a position 3L with respect to the lower end of the front surface panel 5. In other words, the auxiliary input ports 4b, 4c are arranged in the middle of the front surface panel 5 with respect to the vertical direction. Furthermore, as shown in Figure 4, the auxiliary inlets 4b and 4c are opposite the front heat exchanger 20a.

<Mounting the indoor unit 2>

Next, the assembly steps of the indoor unit 2 having the structure described above are described.

First, the indoor fan 21, indoor heat exchanger 20, outlet port unit 46 and internal devices such as electrical component unit 47 are attached to the frame frame 41. At this time, on the side The right-hand side of the indoor heat exchanger 20, when viewed from the front, is arranged, fixed to the frame frame 41, the duct integrally provided with the indoor heat exchanger 20. To this duct the temperature sensor of panel input 25 and the temperature sensor panel 26 output from the front end of the line (not shown) extending from the electrical component unit 47.

Next, the radiation panel 30 is attached to the truss frame 41. Next, the connection parts 36a, 36b of the panel conduit 36 integrally provided with the radiation panel 30 are connected to the third connection part 17 and the fourth connecting part 18 of the duct integrally provided with the indoor heat exchanger 20. After this, the outlet port cover 51 is fixed above the radiation panel 30, and the front grille 42 and the opening / closing 52 are set sequentially below radiation panel 30.

To disassemble the indoor unit 2 for maintenance or repair purposes, the steps described above are reversed. That is, for example, to remove the radiation panel 30, the outlet port cover 51, the open / close panel 52 and the front grill 42 are removed first, and then the radiation panel 30 is removed.

As previously described, the panel inlet temperature sensor 25 and the panel outlet temperature sensor 26 are arranged in the duct integrally provided with the indoor heat exchanger 20. Therefore, when radiation panel 30 is removed, panel inlet temperature sensor 25 and panel outlet temperature sensor 26 do not move unless indoor heat exchanger 20 is removed from frame frame 41. In cases Wherein the panel conduit 36 of the radiation panel 30 has a sensor, the sensor wiring must be disconnected each time the radiation panel 30 is removed. However, such a process is not necessary in the present embodiment.

<Remote control 9>

With the remote control 9, a user is able to start or stop the operation of the air conditioner 1, to set the operating mode, to set the target indoor temperature (indoor temperature setpoint), or to set the amount of air blown , or similar. During hot air heating operation and cooling operation, the air quantity setting can be selected from “automatic air quantity”, and from “strong” to “weak”. In the present embodiment, the amount of air is controlled automatically during radiation heating operation and radiation breeze heating operation.

<Controller 7>

Next, referring to Figure 10, the controller 7 for the control of the air conditioning 1 is described.

As shown in Figure 10, the controller 7 includes a storage 70, a motor-driven indoor valve controller 72, an indoor fan controller 73, a compressor controller 74, and a motor-driven outdoor valve controller 75. .

The storage 70 stores different operating settings related to the air conditioner 1, a control program, a table of data necessary to execute the control program, or the like. The operating settings include user settings that are set by a user operating the remote control 9, such as the target indoor temperature (indoor temperature setpoint), and a default setting that is set in advance on the air conditioner 1 In the air conditioner 1 of the present embodiment, the range of the target temperature of the radiation panel 30 is limited to a predetermined temperature range (for example, 50 to 55 ° C). However, the target temperature range of the radiation panel 30 can be set by operating the remote control 9.

The motor-driven inner valve controller 72 controls the number of input pulses to the stepper motor (not shown) to control the motor-driven inner valve 23 to control the opening degree of the motor-driven inner valve 23. During the cooling operation or the hot air heating operation, the motor-driven indoor valve controller 72 closes the motor-driven indoor valve 23. In addition, during the radiation heating operation or the breeze heating operation of radiation, the motor-driven indoor valve controller 72 controls the opening degree of the motor-driven indoor valve 23 as a function of the temperature of the radiation panel 30. Specifically, as shown below (equation 1), a predicted value (hereinafter referred to simply as radiation panel temperature) Tp of the tempe The surface area of the radiation panel 30 is calculated from the temperature Tp1 (first temperature) measured by the inlet temperature sensor of the panel 25 and from a temperature Tp2 (second temperature) measured by the outlet temperature sensor of the panel 26 The degree of opening of the motor-driven inner valve 23 is controlled so that this radiation panel temperature Tp is within a target panel temperature range (for example 50 to 55 ° C).

Tp = (Tpl + Tp2) xA + B (equation 1)

It should be noted that the above A and B of (equation 1) are both a constant in the present embodiment, and A = 0.5 and B = 0.

The following is the control of the motor-driven inner valve 23, during radiation heating operation or radiation breeze heating operation.

The motor-driven indoor valve controller 72 controls the motor-driven indoor valve 23 differently for each of the five different zones set for the radiation panel temperatures Tp, as shown in Figure 11. The five Different zones are: a climb zone, a no-change zone, a suspended zone, a stop zone and a recovery zone. When the radiation panel temperature Tp is in the rising zone, the number of input pulses to the stepper motor is increased according to a ratio DEV1 (pulse) / TEV1 (Sec) in order to increase the opening degree of the motor-driven inner valve 23. When the radiation panel temperature Tp is in the unchanged zone, the number of input pulses to the stepping motor does not change so as not to result in a change in the degree of opening of the motor-operated inner valve 23. When the radiation panel temperature Tp is in the suspended zone, the number of input pulses to the stepper motor is reduced according to a ratio DEV2 (pulse) / TEV2 (Sec.), in order to reduce the opening degree of the motor-driven inner valve 23. When the radiation panel temperature Tp is in the stop zone, the number of input pulses to the stepping motor is zeroed to close the motor-actuated internal valve 23. When the Radiation panel temperature Tp enters the stop zone, a control is executed at the start of operation after the radiation panel temperature Tp falls to the recovery zone. The control at the start of operation is a control for setting the opening degree of the motor-operated inner valve 23 to an initial opening degree for a predetermined period t1.

It is to be noted that in the present embodiment, the ratio DEV1 (pulse) / TEV1 (Seg.) According to which the opening degree of the motor-driven inner valve 23 is increased in the rising zone and the ratio DEV2 ( pulse) / TEV2 (Seg.) according to which the opening degree of the motor-driven inner valve 23 is reduced in the suspended zone are equal. However, these relationships may be different from each other.

As shown in Figure 11 and Table 1, while the radiation panel temperature Tp is increasing, the radiation panel temperature Tp less than 53 ° C is the rising zone, the panel temperature of radiation Tp of 53 ° C or higher but less than 55 ° C is the unchanged zone, the radiation panel temperature Tp of 55 ° C or higher but less than 70 ° C is the suspended zone, the radiation panel temperature Tp of 70 ° C or higher is the stop zone. That is, when the radiation panel temperature Tp is relatively low, the motor-driven indoor valve controller 72 carries out a control to increase the opening degree of the motor-driven indoor valve 23, and when the panel temperature of radiation Tp reaches or exceeds a certain level, it carries out a control to make the opening degree of the motor-driven inner valve 23 not change. When the radiation panel temperature Tp is relatively high, the inner valve controller motor-driven 72 performs a control to reduce the opening degree of the motor-driven inner valve 23. When the radiation panel temperature Tp is excessively high (70 ° C or more), the inner valve controller driven by motor 72 performs a control to close the motor-actuated inner valve 23.

[Table 1]

After the radiation panel temperature Tp rises to 70 ° C or more, the motor-driven inner valve 23 is kept closed until the temperature drops to the recovery zone, which is lower than 45 ° C. On the other hand, when the radiation panel temperature Tp rises and then starts to fall from a temperature of less than 70 ° C, the radiation panel temperature Tp of less than 70 ° C but not less than 53 ° C is the suspended zone, the radiation panel temperature Tp less than 53 ° C but not less than 51 ° C is the no-change zone, the radiation panel temperature Tp less than 51 ° C is the rise zone.

The indoor fan controller 73 controls the rotation frequency of the indoor fan 21.

During hot air heating operation, automatic air quantity operation of cooling operation, or radiation heating operation, the fan controller Indoor 73 controls the rotation frequency of indoor fan 21 as a function of the indoor temperature measured by the indoor temperature sensor 24, the indoor temperature setpoint, or the like. In addition, when the air amount setting is set to either "strong" to "weak" during hot air heating operation or cooling operation, or during radiation breeze heating operation, the frequency of rotation of the indoor fan 21 is controlled to be the rotation frequency corresponding to one of the respective preset fan speeds.

Compressor controller 74 controls the operating frequency of compressor 60, as a function of indoor temperature, indoor temperature setpoint, heat exchanger temperature measured by temperature sensor 27, or the like.

The motor-driven outer valve controller 75 controls the opening degree of the motor-driven outer valve 64. Specifically, the motor-driven valve controller 75 controls the opening degree of the motor-driven outer valve 64 in order to that the temperature measured by the discharge temperature sensor 66 is the optimum operating state temperature. The optimum temperature is determined based on a calculated value that takes into account the temperature of the indoor heat exchanger and / or the temperature of the outdoor heat exchanger.

<Controller control example 7>

Referring to Figure 12, exemplary changes in room temperature, indoor fan 21 rotation frequency, radiation panel temperature Tp, interior actuated valve opening degree are described below. by motor 23, the operating frequency of the compressor 60, when the air conditioner 1 is controlled by the controller 7. It should be noted that the example of Figure 12 shows a case in which the radiation heating operation and the operation Radiation breeze heating are switched between each other depending on room temperatures.

First, after operation is started, the operating frequency of the compressor 60 is raised in steps to time t1. At this time, the opening degree of the motor-operated inner valve 23 is set to a predetermined initial opening degree. Therefore, the room temperature and the radiation panel temperature Tp increase. When the radiation panel temperature Tp is 55 ° C or higher, the opening degree of the motor-driven inner valve 23 is controlled to decrease. Furthermore, at time t2 and thereafter, the rotation frequency of indoor fan 21 is reduced in steps, and becomes c1 at time t3. At time t3 and thereafter, the rotation frequency of the indoor fan 21 is set at c1. The period from the start of operation to time t3 corresponds to radiation heating operation and the operation is switched to radiation breeze heating operation at time t3 and thereafter. At time t4 and thereafter, the operating frequency of the compressor 60 is reduced in steps in order to approximate the room temperature that is higher than the indoor temperature setpoint and is lowered to the temperature setpoint. In this way, the radiation panel temperature Tp is lowered. Therefore, after time t5, the degree of opening of the motor-driven inner valve 23 is controlled to open in order to raise the radiation panel temperature Tp to a temperature within the target temperature range.

<Characteristics of air conditioner 1 of the present embodiment>

In the air conditioner 1 of the present embodiment, a refrigerant circuit 10 connecting the indoor unit 2 and the outdoor unit 6 with each other includes: a first channel 12 provided with an indoor heat exchanger 20, and a second channel 13 connected in parallel with the first channel 12, which is provided with a radiation panel 30. The circuit includes an inlet temperature sensor of panel 25 and an outlet temperature sensor of panel 26. The inlet temperature sensor of panel 25 it is arranged in a conduit at a position which is on the upstream side of the radiation conduit 36c of the radiation heat exchanger 34 of the radiation panel 30 of the second channel 13, during the heating operation. The panel outlet temperature sensor 26 is disposed in the conduit at a position that is on the downstream side of the radiation conduit 36c, during heating operation. In other words, the inlet temperature sensor of the panel 25 is arranged in a conduit which, during heating operation, is on the side located upstream of the one located most upstream of the two radiation units of the heat exchanger. radiation 34 (that is, where the radiation plate 31 and the linear portion above the radiation conduit 36c are in contact). In addition, the panel outlet temperature sensor 26 is arranged in the duct which, during heating operation, is on the downstream side of the most downstream of the two radiation units (i.e., where the radiation plate 31 and the linear portion below the radiation conduit 36c are in contact).

Therefore, the temperatures measured by the inlet temperature sensor of the panel 25 and by the outlet temperature sensor of the panel 26 are hardly influenced by the radiation of the radiation heat exchanger 34 nor by the radiation due to natural convection. . This makes temperature control possible radiation panel 30. In addition, during heating operation, the panel inlet temperature sensor 25 is capable of measuring the temperature of the refrigerant before it circulates inside the radiation conduit 36c of the radiation heat exchanger 34 of the radiation panel 30. In other words, it is possible to measure the temperature of the refrigerant before the temperature drops due to radiation from the radiation heat exchanger 34. Therefore, the generation is quickly and accurately prevented of excessive heat from radiation panel 30.

In addition, during the cooling operation, the motor-operated inner valve 23 to prevent the refrigerant from circulating inside the radiation conduit 36c of the radiation panel 30. However, even though the refrigerant leaks out of the inner valve operated by motor 23, the outlet temperature sensor of the panel 26 arranged between the internal motor-operated valve 23 and the radiation conduit 36c of the radiation panel 30 is capable of detecting the leak before the refrigerant circulates inside the conduit. radiation 36c from radiation panel 30. Therefore, it is possible to quickly and accurately detect refrigerant leakage and detect condensation on radiation panel 30. Furthermore, the predicted temperature value of radiation panel 30 is calculated with Accuracy as a function of the temperatures measured by the inlet temperature sensor of panel 25 and by the outlet temperature sensor of panel 26.

Furthermore, the air conditioner 1 of the present embodiment includes a motor-operated internal valve 23 arranged in a conduit at a position which, during heating operation, is on the downstream side of the radiation conduit 36c of the radiation panel 30. This motor-driven internal valve 23 is controlled as a function of the temperature Tp1 measured by the inlet temperature sensor of the panel 25 arranged in the conduit on the side located upstream of the radiation conduit 36c, and the temperature Tp2 measured by the panel outlet temperature sensor 26 disposed in the downstream side duct of the radiation duct 36c. Therefore, by means of the control of the motor-driven indoor valve 23, it is possible to adjust, to the target temperature, the radiation panel temperature Tp obtained from the temperature Tp1 measured by the panel inlet temperature sensor. 25 and the temperature Tp2 measured by the panel outlet temperature sensor 26. Therefore, the performance of the indoor heat exchanger 20 is not influenced, unlike the case where the radiation panel temperature Tp is It is controlled by control of the motor-driven outer valve 64, which is the main decompression structure.

Furthermore, in the air conditioner 1 of the present embodiment, the inlet temperature sensor of the panel 25 is located in a position closer to the radiation conduit 36c than to the branch section 10a. This makes it possible to measure the temperature of the coolant immediately before it flows through the interior of the radiation conduit 36c. Therefore, a very accurate calculation of the predicted temperature value of the radiation panel 30 is possible.

Furthermore, in the air conditioner 1 of the present embodiment, the panel outlet temperature sensor 26 is arranged in a position closer to the radiation conduit 36c than to the motor-driven inner valve 23. This makes it possible to measure the temperature. temperature of the coolant immediately after it exits the radiation conduit 36c. Therefore, a very accurate calculation of the predicted temperature value of the radiation panel 30 is possible.

In this way, the embodiment of the present invention has been described in the foregoing. However, it should be noted that the specific structures of the present invention are not limited to the above embodiment. The above embodiment is not to be construed as defining the scope of the present invention, which is defined by the claims set forth below. Any modifications within the scope of the claims, and those equivalent to the claims in terms of meaning, will be included in the present invention.

The above embodiment deals with a case where the refrigerant circuit 10 connecting the indoor unit 2 and the outdoor unit 6 to each other includes the first channel 12 having the indoor heat exchanger 20 and the second channel 13 connected in parallel. with the first channel 12, and the radiation panel 30 is arranged in the second channel 13. However, the present invention is not limited to this, and the indoor heat exchanger 20 and the radiation panel 30 may be connected in series .

That is, as shown in Figure 13, a refrigerant circuit 110 of the air conditioner 101 relating to the first modification of the present embodiment includes an annular main channel 111 in which an external motor-operated valve 64, an exchanger external heat exchanger 62, a compressor 60, a radiation panel 30 and an indoor heat exchanger 20 are connected sequentially. The discharge side conduit and the intake side conduit of the compressor 60 are connected to a four-way valve 61. On both sides of the radiation panel 30 there are branch sections 101a and 101b, and branch sections 101a and 101b they are connected to both ends of the branch passageway 112, respectively. It should be noted that the branch section 101a is located between the indoor heat exchanger 20 and the radiation panel 30, and that the branch section 101b is on the opposite side from the branch section 101a, on the radiation panel 30 The branch passageway 112 has a first motor-operated inner valve 128.

Between the radiation panel 30 and the branch section 101a there is a second internal motor-operated valve 123. An inlet temperature sensor of the panel 25 is arranged between the branch section 101b and a radiation conduit 36c of the radiation panel 30 , and a panel outlet temperature sensor 26 is disposed between the second motor-operated inner valve 123 and the radiation conduit 36c of the radiation panel 30.

In the refrigerant circuit 110, during the cooling operation, the first motor-driven inner valve 128 is opened and the second motor-driven inner valve 123 is opened, and the four-way valve 61 is switched to a state shown by the The dashed line in Figure 13. Therefore, the high-temperature, high-pressure refrigerant from compressor 60 flows into the outdoor heat exchanger 62, through the four-way valve 61, as shown by the arrow of dashed line in Figure 13. Next, the refrigerant condensed by the outdoor heat exchanger 62 circulates into the indoor heat exchanger 20, after being depressurized by means of the motor-driven outdoor valve 64. In addition, the refrigerant vaporized by indoor heat exchanger 20 circulates into compressor 60, through branching passageway 112, valve four-way 61 and accumulator 65.

During the hot air heating operation, the first motor-driven indoor valve 128 is opened and the second motor-driven indoor valve 123 is closed, and the four-way valve 61 is switched to a state shown by the solid line of the Figure 13. Therefore, the high-temperature, high-pressure refrigerant from compressor 60 flows into indoor heat exchanger 20, through four-way valve 61 and branch passageway 112, as shown by the solid line arrow in Figure 13. Next, the refrigerant condensed by the indoor heat exchanger 20 circulates into the outdoor heat exchanger 62, after being depressurized by means of the outdoor motor-driven valve 64 In addition, the refrigerant vaporized by the outdoor heat exchanger 62 circulates into the compressor 60 through the four-way valve 61 and d accumulator 65.

During the radiation heating operation and the radiation breeze heating operation, the first motor-driven indoor valve 128 is closed and the second motor-driven indoor valve 123 is opened, and the four-way valve 61 is switched to a state shown by the solid line in Figure 13. Therefore, the high-temperature, high-pressure refrigerant from the compressor 60 flows into the radiation panel 30 through the four-way valve 61, and then flows to the inside of the radiation panel. inside the indoor heat exchanger 20, as shown by the bold arrow in Figure 13. Next, the refrigerant condensed by the radiation panel 30 and the indoor heat exchanger 20 circulates into the outdoor heat exchanger 62 , after being depressurized by means of the motor-driven external valve 64. The refrigerant vaporized by the external heat exchanger ior 62 flows into compressor 60, through four-way valve 61 and accumulator 65.

Also in the air conditioning 101 of this modification the temperatures measured by the inlet temperature sensor of the panel 25 and by the outlet temperature sensor of the panel 26 are not influenced by the radiation of the radiation heat exchanger 34 of the radiation panel 30, as in the case of the previously described embodiment. Therefore, the radiation panel 30 is properly controlled.

In this modification, the inlet temperature sensor of the panel 25 is arranged in the conduit that extends from the four-way valve 61 to the radiation conduit 36c of the radiation panel 30, that is, in the conduit on the water side. above the radiation conduit 36c of the radiation panel 30 of the circuit during heating operation. Furthermore, the panel outlet temperature sensor 26 is arranged in the conduit extending from the indoor heat exchanger 20 to the radiation conduit 36c of the radiation panel 30, that is, in the conduit on the downstream side of the radiation conduit 36c of radiation panel 30 of the circuit during heating operation.

A refrigerant circuit 210 of an air conditioner 201 relating to a second modification of the present embodiment includes an annular main channel 211 in which an external motor-operated valve 64, an external heat exchanger 62, a compressor 60, a heat exchanger Indoor heat 20 and a radiation panel 30 are connected sequentially, as shown in Figure 14. In other words, this modification differs from the first modification's refrigerant circuit 110 in that the indoor heat exchanger 20 and the radiation panel 30 are located in reverse. As in the case of the refrigerant circuit 110 of the first modification, branch sections 201a, 201b are arranged on both sides of the radiation panel 30, respectively, and branch sections 201a, 201b are connected to both ends of the exhaust duct. branching step 212, respectively. Disposed in the branch passageway 212 is a first motor-driven inner valve 228.

Between the radiation panel 30 and the branch section 201a is arranged a second internal motor-operated valve 223. Furthermore, an inlet temperature sensor of the panel 25 is arranged between the branch section 201b and a radiation conduit 36c of the panel. radiation 30, and a panel outlet temperature sensor 26 is disposed between the second motor-operated inner valve 223 and the radiation conduit 36c of radiation panel 30.

Also in the air conditioning 201 of this modification the temperatures measured by the inlet temperature sensor of the panel 25 and by the outlet temperature sensor of the panel 26 are hardly influenced by the radiation of the radiation heat exchanger 34 of the radiation panel 30, as in the case of the previously described embodiment. Therefore, the radiation panel 30 is properly controlled. In this modification, the inlet temperature sensor of the panel 25 is arranged in the conduit that extends from the indoor heat exchanger 20 to the radiation conduit 36c of the radiation panel 30, that is, in the conduit on the water side. above the radiation conduit 36c of the radiation panel 30 of the circuit during heating operation. Furthermore, the panel outlet temperature sensor 26 is disposed in the conduit extending from the motor-driven outer valve 64 to the radiation conduit 36c of the radiation panel 30, that is, in the conduit on the downstream side. of the radiation conduit 36c of the radiation panel 30 of the circuit during heating operation.

Furthermore, the above embodiment deals with a case where the inlet temperature sensor of the panel 25 is arranged in the conduit which, during heating operation, is on the upstream side of the radiation conduit 36c of the radiation panel. 30 of the second channel 13, and the outlet temperature sensor of the panel 26 is arranged in the conduit which, during heating operation, is on the downstream side of the radiation conduit 36c of the radiation panel 30. However, the present invention is not limited to this. That is, the temperature can be provided in at least one of the conduits which, during heating operation, are either on the upstream side or on the downstream side of the radiation conduit 36c of the radiation panel 30 of the second channel. 13. The above embodiment deals with a case where the motor-driven indoor valve controller 72 calculates the predicted temperature value of the radiation panel 30 based on the temperatures measured by the inlet temperature sensor of the panel 25 and by the panel outlet temperature sensor 26, respectively. When there is only one temperature sensor, the predicted temperature value of the radiation panel 30 is calculated based on the temperature measured by that single temperature sensor.

Furthermore, the above embodiment deals with a case where the motor-driven indoor valve controller 72 controls the motor-driven indoor valve 23, as a function of the temperature Tp1 measured by the inlet temperature sensor of the panel 25 and the temperature Tp2 measured by the panel outlet temperature sensor 26, the motor-operated inner valve 23 being arranged in the conduit which, during heating operation, is on the downstream side of the radiation conduit 36c of the radiation panel 30. The motor-driven indoor valve 23 which is controlled by the motor-driven indoor valve controller 72 can be arranged in the conduit which, during heating operation, is on the upstream side of the radiation conduit 36c of the panel. radiation 30.

Furthermore, the above embodiment deals with a case where the radiation panel temperature Tp is calculated by the following (equation 1).

Tp = {Tpl + Tp2) x A + B (equation 1)

It must be taken into account that Tp1 is a temperature measured by the inlet temperature sensor of panel 25, Tp2 is the temperature measured by the outlet temperature sensor of panel 26, and the constants A = 0.5, B = 0. The previous values of the constants are not limited to them. The values of the constants A and B are obtained by experiments.

Furthermore, the above embodiment deals with a case where the inlet temperature sensor of the panel 25 is arranged in a position closer to the radiation conduit 36c than to the branch section 10a. However, the inlet temperature sensor of the panel 25 can be arranged closer to the branch section 10a than to the radiation conduit 36c.

Furthermore, the above embodiment deals with a case where the panel outlet temperature sensor 26 is arranged in a position closer to the radiation conduit 36c than to the motor-driven inner valve 23. However, the temperature sensor The outlet of the panel 26 is disposed in a position closer to the internal motor-operated valve 23 than to the radiation conduit 36c.

Furthermore, the above embodiment deals with a case where the inlet temperature sensor of the panel 25 and the outlet temperature sensor of the panel 26 are arranged in the conduits integrally provided with the indoor heat exchanger 20; however, the present invention is not limited thereto. That is, the inlet temperature sensor of the panel 25 may be arranged between the radiation conduit 36c and the part that is the upper one of the two linear parts of the connection parts 36a, as shown in Figure 8 ( to). The panel outlet temperature sensor 26 may be arranged between the connection portions 36b and the portion that is the lower one of the two linear portions of the radiation conduit 36c.

Furthermore, in the above embodiment, the radiation conduit 36c constituting the radiation heat exchanger 34 includes two linear parts attached to the radiation plate 31 and the conduit between the two linear parts; however, the present invention is not limited thereto. That is, the entire radiation conduit 36c can be attached to the radiation plate 31. The radiation conduit 36c, when there are a plurality of parts attached to the radiation plate 31, includes a plurality of parts to be attached to the radiation plate 31 and the conduit for connecting those parts. That is, both end parts of the radiation conduit 36c are fixed to the radiation plate 31.

Industrial applicability

The present invention makes possible a suitable control of the temperature of the radiation panel (radiation heat exchanger).

List of reference signs

1. Air conditioning

2. Indoor unit

6. Outdoor unit

10. Refrigerant circuit

10a. Branching section

10b. Junction section

11. Main channel

12. First channel

13. Second channel

20. Indoor heat exchanger

23. Motor-driven inner valve (valve structure)

25. Panel inlet temperature sensor (first temperature sensor)

26. Panel outlet temperature sensor (second temperature sensor)

30. Radiation panel

31. Radiation plate

34. Radiation heat exchanger

36c. Radiation conduit

60. Compressor

62. Outdoor heat exchanger

64. External motor-operated valve (decompression structure)

Claims (3)

1. An air conditioner (1), comprising a refrigerant circuit (10) including a compressor (60), a decompression structure (64), an outdoor heat exchanger (62), an indoor heat exchanger (20 ) and a radiation heat exchanger (34), wherein the refrigerant circuit (10) is configured to circulate a high temperature refrigerant through the radiation heat exchanger (34) during radiation heating operation, wherein the refrigerant circuit (10) includes : a main channel (11) having the decompression structure (64), the outdoor heat exchanger (62) and the compressor (60) in this order; a first channel (12) provided with the indoor heat exchanger (20), connecting a branch section (10a) and a connecting section (10b), the branch section (10a) being arranged in a position that, during the heating operation, is on the side located downstream of the compressor (60) in the main channel (11), and the connecting section (10b) being arranged in a position that, during the heating operation, is on the side located upstream of the decompression structure (64); and a second channel (13) provided with the radiation heat exchanger (34), which connects the branch section (10a) and the connecting section (10b) in parallel with the first channel (12) during heating operation, characterized because a first temperature sensor (25) is arranged in a conduit which, during heating operation, is on the upstream side of the radiation heat exchanger (34) in the second channel (13) and a second sensor temperature (26) is arranged in a conduit which, during heating operation, is on the downstream side of the radiation heat exchanger (34) in the second channel (13), wherein: the refrigerant circuit (10) has a valve structure (23) arranged in the conduit which, during heating operation, is on the side located upstream of the radiation heat exchanger (34) in the second channel (13) or in the conduit which, during heating operation, is on the downstream side of the radiation heat exchanger (34) in the second channel (13); and The valve structure (23) is controlled as a function of a first temperature measured by the first temperature sensor (25) and a second temperature measured by the second temperature sensor (26). The air conditioner (1) according to claim 1, in which the first temperature sensor (25) is located in a position closer to the radiation heat exchanger (34) than to the branch section (10a). The air conditioner (1) according to claim 1 or 2, wherein the valve structure (23) is arranged in the conduit which, during heating operation, is on the downstream side of the heat exchanger of radiation (34) in the second channel (13), and the second temperature sensor (26) is located closer to the radiation heat exchanger (34) than to the valve structure (23).