JPH03113249A - Air-conditioning snow melting device - Google Patents

Abstract

PURPOSE:To prevent capability of heating and defrosting in winter when there is no snow accumulation from being lowered by providing a snow melting heat exchanger connected via a solenoid valve among refrigerant passages of a room heat exchanger in a refrigeration circuit, a snow melting panel connected to a secondary side of said snow melting heat exchanger via a refrigerant circulation pump, and a room heat exchanger solenoid valve. CONSTITUTION:High temperature high pressure gas refrigerant discharged from a compressor 1 passes through a four-way valve 2 and diverges to the side of a room heat exchanger 3 and to the side of a snow melting heat exchanger 8, one entering the room heat exchanger 3 after passing through a solenoid valve 13 to heat the inside of a room. High pressure fluid refrigerant more cooled than room air is reduced in its pressure by a throttling device 5 after passing through a solenoid valve 14 and enters an outdoor heat exchanger 4 and is sucked into the compressor 1. The other of the diverging gas enters the snow melting heat exchanger 8 after passing a solenoid valve 15. It exchanges there heat with a nonfreezing liquid circulated by a pump 10 with high pressure fluid refrigerant, and further flows in a snow melting panel 12 to melt snow. On the other hand, the high pressure fluid refrigerant enters the throttling device 5 after passing through a solenoid valve 16 into lowe pressure gas/liquid mixed refrigerant, and enters the outdoor heat exchange 4. It is further vaporized and is sucked into the compressor 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a heating and cooling snow melting device that melts accumulated snow and cools and heats indoor rooms.

[Prior Art] FIGS. 7 and 8 are a refrigerant circuit diagram of a conventional snow melting device for air conditioning and heating, and a diagram of how the device is installed in a house.

In the figure, 1 is a compressor, 2 is a four-way valve, 3 is an indoor heat exchanger, 4 is an outdoor heat exchanger, 5 is a throttle device, 6 is an indoor blower, 7 is an outdoor blower, and 8 is the discharge of compressor l. Side and four-way valve 2
This is a snow melting heat exchanger with a primary side connected between them, and these are connected in a closed loop through refrigerant piping 9 to form a refrigerant circuit.

Further, a snow melting panel 12 is connected to the secondary side of the snow melting heat exchanger 8 via an antifreeze circulation pump 10 and piping 11.

In FIG. 8, 30 is a house, and a snow melting panel 12 is installed on the roof of the house. 31 is the compressor 1 shown in FIG. Four-way valve 2. This is a device main body that incorporates an outdoor heat exchanger 4, its blower 7, a snow melting heat exchanger 8, and a circulation pump 10, and is installed outdoors.

Next, the operation will be explained.

In FIG. 7, solid line arrows indicate the flow of refrigerant during heating operation and snow melting operation, and broken line arrows indicate the flow of refrigerant during cooling operation.

First, during snow melting operation, refrigerant gas that has become high temperature and high pressure in the compressor 1 enters the snow melting heat exchanger 8.

In this snow melting heat exchanger 9, heat exchange is performed between the high-temperature, high-pressure refrigerant gas flowing on the downstream side and the antifreeze flowing on the secondary side, so the antifreeze is heated by the heat of condensation of the refrigerant gas. be done. The heated antifreeze is sent to the snow melting panel 12 by the circulation pump 10, and the snow accumulated on the snow melting panel 12 is melted and removed. The refrigerant liquid condensed in the snow melting heat exchanger 8 is sent to the indoor heat exchanger 3 through the four-way valve 2.

However, since the air blower m6 is stopped during the snow melting operation, the refrigerant liquid passes through the indoor heat exchanger 3 and enters the outdoor heat exchanger 4 after being depressurized by the expansion device 6.

The indoor heat exchanger 4 absorbs outside air heat energy and evaporates it.
The refrigerant gas enters the compressor 1 and becomes high-temperature, high-pressure refrigerant gas again.

During heating operation, the circulation pump 10 is stopped and the indoor blower 6 is operated to perform heating.

Also, during cooling operation, cooling is performed by switching the four-way valve 2 to the state shown by the broken line to direct the flow of refrigerant in the refrigerant circuit in the direction of the broken line arrow in FIG. As long as the solar radiation is not extremely strong, efficient cooling operation can be achieved by operating the circulation pump IO and thereby causing the snow melting panel 12 to function as a radiator.

[Problems to be Solved by the Invention] In the conventional air-conditioning/heating/snow melting device as described above, the high temperature and high pressure refrigerant gas discharged from the compressor 1 is always transferred to the snow melting heat exchanger 8.
Because of the structure, even during heating and defrosting in winter when there is no snow, the high-temperature, high-pressure gas from the compressor 1 is heat exchanged in the snow melting heat exchanger 8, and then transferred to the indoor heat exchanger 3 and the outdoor. It will be sent to the heat exchanger 4, and as a result, the heating capacity will decrease.

Furthermore, when snow melting load and heating load occur simultaneously, there is a problem in that both snow melting capacity and heating capacity decrease.

This invention was made in order to solve the above-mentioned problems, and aims to provide an air-conditioning/heating/snow melting device that prevents a decrease in heating and defrosting performance in winter when there is no snow and enables efficient operation. purpose.

[Means for Solving the Problems] An air conditioning/heating/snow melting device according to the present invention includes a refrigerant circuit in which a compressor, a four-way valve, an indoor heat exchanger, a throttle device, and an outdoor heat exchanger are connected in a closed loop, and the refrigerant circuit. A snow melting heat exchanger connected via a solenoid valve that opens and closes the flow of refrigerant between the refrigerant passage with the four-way valve of the indoor heat exchanger and the refrigerant passage with the throttling device, and the secondary of the snow melting heat exchanger. It is equipped with a snow melting panel connected to the side via a refrigerant circulation pump, and a solenoid valve that opens and closes the flow of refrigerant to the indoor heat exchanger.

Further, the present invention adds a temperature sensor that detects the indoor air temperature and an auxiliary heating device that is activated when the air temperature detected by the temperature sensor is below a set value to the air conditioning/heating/snow melting device configured as described above. That's what happens.

[Function] In this invention, the solenoid valve of the indoor heat exchanger, the solenoid valve of the snow melting heat exchanger, and the four-way valve are used for cooling.

When the mode is switched according to each operation mode of heating, snow melting, snow melting + heating, and defrosting, the refrigerant path of the refrigerant circuit changes to a flow suitable for each of the above operations.

Therefore, heat loss in each operation mode is eliminated, allowing efficient operation.

In addition, in this invention, when the temperature of the air blown into the room detected by the temperature sensor falls below a set value, the auxiliary heating device operates, blowing high-temperature air into the room regardless of the snow melting load, and heating the indoor air. become. Therefore, it is possible to prevent the heating capacity from decreasing when both snow melting and heating loads occur.

[Example] Embodiments of the present invention will be described below based on the drawings.

1 to 5 are configuration diagrams of an air-conditioning/heating/snow melting device showing one embodiment of the present invention, in which FIG. 1 is for cooling, FIG. 2 is for heating, FIG. 3 is for snow melting, and FIG. 4 is for snow melting. shows the system diagram during snow melting and heating, and Figure 5 shows the system diagram during defrosting.

In this figure, the same parts as those in FIG.
Four-way valve 2. Indoor heat exchanger 3. Outdoor heat exchanger4. The throttle device 5 is connected in a closed loop through a pipe 9. Electromagnetic valves 13 and 14 are connected in series to the refrigerant passage connecting the four-way valve 2 and the indoor heat exchanger 3 and the refrigerant passage connecting the indoor heat exchanger 3 and the expansion device 5, respectively.

Further, one end of the primary side of the snow melting heat exchanger 8 is connected to the connection point between the four-way valve 2 and the solenoid valve 13 via a piping 9a via the solenoid valve 15, and the other end of the next side is connected to a throttle device. 5 and the solenoid valve 14 via a solenoid valve 16 via a pipe 9b.

On the secondary side of the snow melting heat exchanger 8, there is a pipe 1 as shown in FIG.
1, an antifreeze circulation pump 10 for snow melting and a snow melting panel 12 are connected in series.

Next, the operation of this embodiment configured as described above will be explained.

During the cooling operation shown in FIG. 1, the circulation pump 10 is stopped,
Open solenoid valves 13 and 14, close solenoid valves 15 and 16,
Then, the four-way valve 2 is switched to the connected state shown in FIG. When the compressor 1 is driven in this state, the refrigerant flows in the direction of the arrow in FIG. That is, the high-temperature, high-pressure gas refrigerant discharged from the compressor 1 passes through the four-way valve 2 and enters the outdoor heat exchanger 4, where it is cooled by the outside air ventilated by the outdoor blower 7 and condensed to become a high-pressure liquid refrigerant. This liquid refrigerant is depressurized by passing through the expansion device 5 and becomes a low-pressure gas-liquid mixed refrigerant, which enters the indoor heat exchanger 3 via the solenoid valve 14 .

Here, it is heated by the indoor air blown by the indoor blower 6 and evaporates, becoming a low-pressure gas refrigerant. This cools the indoor air and cools the room.

On the other hand, the low-pressure gas refrigerant that has been heat exchanged with the indoor air is sucked into the compressor 1 through the solenoid valve 13 and the four-way valve 2, and becomes high-temperature and high-pressure gas refrigerant again.

Next, the operation during heating operation will be described with reference to FIG.

In this case, the pump 10 is stopped, the solenoid valves 13 and 14 are closed, the electric currents 15 and 16 are opened, and the four-way valve 2 is switched to the connected state shown in FIG. When the compressor 1 is driven in this state, the refrigerant flows in the direction of the arrow in FIG. That is, the high temperature and high pressure gas refrigerant discharged from the compressor 1 is passed through the four-way valve 2. The refrigerant enters the indoor heat exchanger 3 via the electromagnetic valve 13 and is cooled by indoor air ventilated by the indoor blower 6, becoming a high-pressure liquid refrigerant. At this time, the indoor air is heated by the refrigerant to heat the room. Further, the high-pressure liquid refrigerant is depressurized by the expansion device 5 through the electromagnetic valve 14 and enters the outdoor heat exchanger 4 as a low-pressure gas-liquid mixed refrigerant. Here, it exchanges heat with the outdoor air ventilated by the outdoor blower 7 and evaporates, becoming a low-pressure gas refrigerant, which is further sucked into the compressor 1 via the four-way valve 2.

Next, the operation during snow melting operation will be described with reference to FIG.

In this case, the pump 10 is operated, the indoor blower 6 is stopped, the solenoid valves 13.14 are closed, the solenoid valves 15.16 are opened, and the four-way valve 2 is switched to the connected state shown in FIG.

When the compressor 1 is driven in this state, the refrigerant flows in the direction of the arrow in FIG.

That is, the high temperature and high pressure gas refrigerant discharged from the compressor 1 passes through the four-way valve 2 and the solenoid valve 15 and enters the snow melting heat exchanger 8.

Here, it is cooled by exchanging heat with the antifreeze fluid circulated by the pump IO, and becomes a high-pressure liquid refrigerant. Furthermore, the antifreeze heated by the heat of condensation of the gas refrigerant flows through the snow melting panel 12 to melt the snow accumulated on the snow melting panel 12.

On the other hand, the high-pressure liquid refrigerant passes through the electromagnetic valve 16 and is reduced in pressure by the throttle device 5, and enters the outdoor heat exchanger 4 as a low-pressure gas-liquid mixed refrigerant. Here, it exchanges heat with the outdoor air ventilated by the outdoor blower 7 and evaporates, becoming a low-pressure gas refrigerant. This gas refrigerant is sucked into the compressor 1 through the four-way valve 2, and is again compressed into high-temperature, high-pressure gas refrigerant.

Next, the operations during snow melting and heating operation will be described with reference to FIG.゛In this case, the pump 10 is operated and the blower 6.
7 is also maintained in the operating state, the solenoid valves 13 to 16 are opened, and the four-way valve 2 is switched to the connected state shown in FIG. When the compressor 1 is driven in this state, the refrigerant flows in the direction of the arrow in FIG.

That is, the high temperature and high pressure gas refrigerant discharged from the compressor 1 passes through the four-way valve 2 and is divided into two directions: the indoor heat exchanger 3 side and the snow melting heat exchanger 8 side. One of the refrigerants enters the indoor heat exchanger 3 through the solenoid valve 13, is cooled by indoor air ventilated by the indoor blower 6, and becomes a high-pressure liquid refrigerant. The indoor air heated by the heat of condensation of the gas refrigerant heats the room.

Further, the high-pressure liquid refrigerant passes through the electromagnetic valve 14 and is depressurized by the expansion device 5 to become a low-pressure gas-liquid mixed refrigerant and enters the outdoor heat exchanger 4. Here, the outdoor air ventilated by the outdoor blower 7 heats and evaporates the refrigerant into a low-pressure gas refrigerant, which is then sucked into the compressor 1 via the four-way valve 2 .

The other part of the divided gas refrigerant passes through the electromagnetic valve 15 and enters the snow melting heat exchanger 8 . Here, by exchanging heat with the antifreeze fluid circulated by the pump 10, the refrigerant becomes a high-pressure liquid refrigerant. The antifreeze heated by the condensation heat of the gas refrigerant flows through the snow melting panel 12.
2. Melt the snow that has piled up on top.

On the other hand, the high-pressure liquid refrigerant passes through the solenoid valve 16 to the throttle device 5.
The refrigerant enters the tank and is depressurized to become a low-pressure gas-liquid mixed refrigerant. This gas-liquid mixed refrigerant enters the outdoor heat exchanger 4, exchanges heat with the outdoor air ventilated by the outdoor blower 7, evaporates, becomes a low-pressure gas refrigerant, and is sucked into the compressor 1 via the four-way valve 2.

Next, the operation during defrosting operation will be described with reference to FIG.

In this case, operate the pump 10 and the outdoor blower 7, stop the outdoor blower 7, and close the solenoid valves 13 and 14.
The solenoid valves 15 and 16 are opened, and the four-way valve 2 is switched to the connected state shown in FIG. When the compressor 1 is driven in this state, the refrigerant is caused to flow in the direction of the arrow in FIG.

That is, when the outdoor air temperature decreases during heating, snow melting, and snow melting + heating, frost forms on the surface of the outdoor heat exchanger 4, so the refrigeration cycle enters a defrosting operation. Along with this, the high-temperature, high-pressure gas refrigerant discharged from the compressor 1 passes through the four-way valve 2 and enters the outdoor heat exchanger 4, heating the outdoor heat exchanger 4 and melting the frost attached to its surface. In addition, the high-temperature, high-pressure gas refrigerant refrigerated by heating the outdoor heat exchanger 4 becomes a high-pressure liquid refrigerant. This high-pressure liquid refrigerant is depressurized by the expansion device 5, becomes a low-pressure gas-liquid mixed refrigerant, and enters the snow melting heat exchanger 8. Here, the low-pressure gas-liquid mixed refrigerant exchanges heat with the antifreeze fluid circulated by the pump 10 and evaporates, becoming a low-pressure gas refrigerant, which is sucked into the compressor 1 via the electromagnetic valve 15 and the four-way valve 2.

In the present refrigeration cycle as described above, the solenoid valves 13 to 16 and the four-way valve 2 are incorporated in the refrigerant circuit, and these solenoid valves 13 to 16 and the four-way valve 2 are used for cooling, heating, snow melting, snow melting + heating, In addition to changing the flow of refrigerant according to each defrosting operation mode, the heat exchanger 8 for snow melting is not directly connected to the discharge side of the compressor 1 as in the past, so the heat exchanger in each operation mode is Loss is eliminated, efficient operation becomes possible, and heating capacity and defrosting capacity can also be improved.

In addition, during snow melting and heating, the high-temperature, high-pressure gas refrigerant from compressor 1 is distributed to the heating system and the snow melting system.
The ability to restart heating and snow melting can be improved.

FIG. 6 is a configuration diagram showing another embodiment of the air conditioning/heating/snow melting device according to the present invention.

In the figure, 17 is an indoor unit, which is equipped with the indoor heat exchanger 3 and the blower 6 shown in FIG. A temperature sensor 18 is installed at the outlet 17a of the indoor unit 17 to detect the temperature of the outlet air.
is installed. Further, 19 is an auxiliary heating device such as a heater assembled to the indoor unit 17, and 20 is a remote controller.

21 is the compressor 1 shown in FIG. Four-way valve 2. Indoor heat exchanger4. Blower 7. This is an outdoor unit incorporating a throttle device 5 and electromagnetic valves 13 to 16, and the outdoor unit 21 and the indoor unit 17 are connected by a refrigerant pipe 9. Further, 22 is a snow melting unit having a snow melting heat exchanger 8 and a pump 10 shown in FIG. 1, and a pipe 9a is connected between this snow melting unit 22 and the snow melting panel 12.

9b. 23 is a snowfall sensor attached to the snow melting panel 12.

In the embodiment with the above configuration, during the snow melting + heating operation, the temperature sensor 18 detects the temperature of the air blown from the outdoor unit 17,
The temperature of the blown air is taken into a control unit in the remote controller 20, and when the control unit determines that the temperature of the blown air has become below a set value, the auxiliary heating device 19 is operated. Thereby, regardless of the presence or absence of a snow melting load, high-temperature air can be blown into the room to comfortably heat the room, and a decrease in heating capacity and snow melting capacity can be prevented.

[Effects of the Invention] As described above, according to the present invention, cooling,
The structure incorporates a solenoid valve and a four-way valve that change the flow of refrigerant according to each operation mode: heating, snow melting, snow melting + heating, and defrosting, so heat loss in each operation mode is eliminated and efficient operation is achieved. This has the effect of improving heating capacity and defrosting capacity in winter when there is no snowfall.

Moreover, since the configuration is such that the auxiliary heating device can be operated when the blowout temperature of the indoor unit falls below a set value during the snow melter heating operation, it is possible to prevent the heating capacity from decreasing.

[Brief explanation of drawings]

Figures 1 to 5 show an embodiment of an air conditioning/heating snow melting device according to the present invention. Figure 1 is a configuration diagram during heating operation;
3 is a configuration diagram during cooling operation, FIG. 3 is a configuration diagram during snow melting operation, FIG. 4 is a configuration diagram during snow melting + heating operation, and FIG. 5 is a configuration diagram during defrosting operation. FIG. 6 is a block diagram showing another embodiment of the cooling/heating/snow melting device according to the present invention. FIG. 7 is a configuration diagram of a conventional air-conditioning/heating snow melting device, and FIG. 8 is an installation diagram of the same device. ■... Compressor, 2... Four-way valve, 3... Indoor heat exchanger, 4... Outdoor heat exchanger, 5... Throttle device, 6...
・Indoor blower, 7...Outdoor blower, 8...Snow melting heat exchanger, 10...Pump, 12...Snow melting panel, 1
3-16...Solenoid valve, 18...Temperature sensor, 19.
...Auxiliary heating device. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (2)

[Claims] (1) A refrigerant circuit formed by connecting a compressor, a four-way valve, an indoor heat exchanger, a throttling device, and an outdoor heat exchanger in a closed loop, and a refrigerant passage and a throttling device between the four-way valve of the indoor heat exchanger in the refrigerant circuit. a snow melting heat exchanger connected via a solenoid valve that opens and closes the flow of refrigerant between the refrigerant passages of the snow melting heat exchanger, and a snow melting panel connected to the secondary side of the snow melting heat exchanger via a refrigerant circulation pump;
An air conditioning/heating/snow melting device comprising: a solenoid valve that opens and closes a flow of refrigerant to the indoor heat exchanger. (2) A refrigerant circuit formed by connecting a compressor, a four-way valve, an indoor heat exchanger, a throttling device, and an outdoor heat exchanger in a closed loop, and a refrigerant passage and a throttling device between the four-way valve of the indoor heat exchanger in the refrigerant circuit. a snow melting heat exchanger connected via a solenoid valve that opens and closes the flow of refrigerant between the refrigerant passages of the snow melting heat exchanger, and a snow melting panel connected to the secondary side of the snow melting heat exchanger via a refrigerant circulation pump;
a solenoid valve that opens and closes the flow of refrigerant to the indoor heat exchanger;
A heating and cooling system characterized by comprising: a temperature sensor that detects the temperature of air blown into the room; and an auxiliary heating device that operates when the temperature of the blown air detected by the temperature sensor is below a set value and heats the air blown into the room. Snow melting equipment.