JPS621187B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioning/heating hot water supply system, and its purpose is to be able to perform air conditioning/heating operations and supply hot water to a bathtub, and to improve efficiency by recovering waste heat from residual hot water in the bathtub. The purpose is to provide a new air-conditioning, heating, and water-heating device that also provides good heating.

BACKGROUND ART Conventionally, heating and cooling devices using heat pumps and hot water supply and waste heat recovery devices using heat pumps have been put into practical use as devices each having an independent function.

However, in order to meet the recent demand for energy conservation, if you want to use the waste heat from air conditioning operation to supply hot water to the bathtub, or recover the residual water heat from the bathtub and use it as a heat source for heating, you can use conventional methods. I couldn't do it with this method.

The present invention combines a conventional heat pump-based air-conditioning device and a heat pump-based hot water supply device for a bathtub, and provides a new air-conditioning/heating hot water supply system that has multiple functions, including not only air-conditioning operation but also hot water supply to the bathtub and waste heat recovery from the bathtub. It is a device, and its configuration will be explained with reference to the drawings. In FIG. 1, 1 is a compressor;
connected to an outdoor heat exchanger 3 via a four-way valve 2;
A parallel circuit of a heating throttle device 5 and a check valve 7 is connected to this outflow side, and a third on-off valve 12 is connected to this outflow side.
are connected in series. This third on-off valve 12
The refrigerant circuit is branched into two, one being the first
The on-off valve 13a, the cooling throttle device 6, and the parallel circuit of the check valve 8 are connected in series to the indoor heat exchanger 4, and further connected to the compressor via the second on-off valve 15a and the four-way valve 2. Connected to the suction side of 1. On the other hand, the first on-off valve 13b, a parallel circuit of the heat recovery throttling device 10, and the check valve 11 are connected in series to the hot water supply heat exchanger 9, and the second on-off valve 15b and the four-way valve 2 are connected in series. It is connected to the suction side of the compressor 1 via. Further, the suction side of the compressor 1 is connected to the piping connecting the indoor heat exchanger 4 and the hot water supply heat exchanger 9 to the second on-off valves 15a and 15b, respectively, through fourth on-off valves 17a and 17.
They are connected via b. Furthermore, 19 is a circulation pump interposed between the bathtub 20 and the hot water supply heat exchanger, and 21 is a water tap.

Also, A is an indoor unit and B is an outdoor unit.

The operation of the present invention will be explained using the above configuration. FIG. 1 is a refrigerant circuit diagram showing indoor unit A during cooling operation, in which refrigerant flows as indicated by solid arrows. That is, the high-pressure refrigerant gas from the compressor 1 passes through the four-way valve 2, condenses in the outdoor heat exchanger 3, passes through the check valve 7, the third on-off valve that is open, and the first on-off valve 13a, and then is used for cooling. The pressure is reduced by the expansion device 6, the air is evaporated and gasified by the indoor heat exchanger 4, and the room is cooled, and then the air is sucked into the compressor 1 again through the open second on-off valve 15b and the four-way valve 2. At this time, all other on-off valves are closed.

Figure 2 shows normal heating operation using the heat pump of indoor unit A.
Only the on-off valve 13a, the second on-off valve 15a, and the third on-off valve 12 are open, and all other on-off valves are closed.

FIG. 3 shows a case in which hot water is supplied to the bathtub 20 by a heat pump. In this case, high-temperature, high-pressure gas from the compressor 1 passes through the four-way valve 2 and the closed second on-off valve 15b, and is condensed in the hot water supply heat exchanger 9. At the same time, the water supplied from the bathtub 20 by the circulation pump 19 is heated. Next, the condensed and liquefied refrigerant passes through a check valve 11,
First on-off valve 13b and third on-off valve 12 in open state
The pressure is reduced by the heating diaphragm 5 and evaporated by the outdoor heat exchanger 3 while absorbing heat from the outside air.
After that, it is sucked into the compressor 1 again. At this time, all on-off valves other than those mentioned above are in the closed state.

Figure 4 shows that while indoor unit A is being cooled,
At this time, hot water is supplied to the bathtub 20 using the cooling waste heat. That is, the high-pressure and high-temperature refrigerant gas from the compressor 1 passes through the four-way valve 2, the second on-off valve 15b which is in an open state, and radiates heat in the hot water supply heat exchanger 9 to supply hot water to the bathtub 20, and the refrigerant is condensed. It liquefies, passes through the check valve 11 and the open first on-off valves 13b and 13a, is depressurized by the cooling throttle device 6, enters the indoor heat exchanger 4, evaporates, and cools the room.
The gasified refrigerant is sucked into the compressor 1 through the fourth on-off valve 17b which is in an open state. At this time, all on-off valves other than those mentioned above are closed.

FIG. 5 shows a case where indoor unit A heats the room by effectively utilizing the heat remaining in the bathtub. That is, the high-temperature, high-pressure gas from the compressor 1 passes through the four-way valve 2 and the second on-off valve 15a, which is in an open state, to radiate heat in the indoor heat exchanger 4 and heat the room, and the liquefied refrigerant passes through the check valve 8. The pressure is reduced by the waste heat recovery throttling device 10 through the first on-off valves 13a and 13b in the open state, and the residual water heat in the bathtub 20 is absorbed by the hot water supply heat exchanger 9, and becomes refrigerant gas, which is in the open state. Compressor 1 via on-off valve 17a
is inhaled. At this time, all on-off valves other than those mentioned above are closed.

FIG. 6 shows a case where hot water is supplied to the bathtub 20 at the same time as heating the indoor unit A. In this case, the high-temperature, high-pressure gas from the compressor 1 passes through the four-way valve 2, one of which is open, and the second on-off valve. 15b and enters the hot water supply heat exchanger 9 to supply hot water to the bathtub 20.
1. It reaches the third on-off valve 12 via the first on-off valve 13b which is in an open state. The other is the second on-off valve 1 in the open state.
5a, the refrigerant enters the indoor heat exchanger 4 to heat the room, passes through the check valve 8 and the first on-off valve 13a in the open state, and then joins with the refrigerant from the indoor heat exchanger 4 to cool the third refrigerant. The refrigerant passes through an on-off valve 12, is depressurized by a heating throttle device 5, enters an outdoor heat exchanger 3, absorbs heat from the outside air, is gasified, and is sucked into the compressor 1 again via a four-way valve 2. At this time, the fourth on-off valve 17
a and 17b are in a closed state.

By operating as described above, the present invention not only performs independent hot water supply operation and simultaneous operation of hot water supply and heating in addition to cooling and heating the indoor unit, but also hot water supply operation using cooling waste heat during the cooling operation of the indoor unit. It is possible to perform a heating operation of the indoor unit by recovering the heat from the remaining hot water in the bathtub, and it has an extremely excellent effect of being able to perform an energy-saving cooling, heating, and hot water supply operation.

[Brief explanation of the drawing]

FIGS. 1, 2, 3, 4, 5, and 6 are refrigerant circuit diagrams showing the operation of an air-conditioning, heating, and hot-water supply system according to an embodiment of the present invention. 1... Compressor, 2... Four-way valve, 3... Outdoor heat exchanger, 12... Third on-off valve, 13a, 13
b...First on-off valve, 4...Indoor heat exchanger, 9
... Hot water supply heat exchanger, 15a, 15b... Second on-off valve, 17a, 17b... Fourth on-off valve.

Claims (1)

[Claims] 1. In an air-conditioning/heating water supply system in which an indoor unit and a heat exchanger for hot water supply are connected in parallel to one outdoor unit, the refrigerant inflow side and refrigerant outlet side of the indoor unit during cooling operation, and the heat exchanger for hot water supply during hot water supply operation are A first on-off valve and a second on-off valve are provided on the refrigerant outflow side and the refrigerant inflow side, respectively, and a third on-off valve is interposed between the respective first on-off valves and the outdoor unit heat exchanger. Further, the second on-off valve, the indoor heat exchanger and the hot water supply heat exchanger, and the compressor suction side are connected via fourth on-off valves, respectively, and during cooling operation and heating operation, The first and second on-off valves and the respective fourth on-off valves of the hot water supply heat exchanger are closed, and the first on-off valve, second on-off valve, and third on-off valve on the indoor unit side are opened. During hot water supply independent operation, the first on-off valve, the second on-off valve, and the fourth on-off valve on the indoor unit side are closed, and the first on-off valve, the second on-off valve, and the third on-off valve on the hot water supply heat exchanger side are closed. The on-off valve is opened, and the third on-off valve, the second on-off valve on the indoor unit side, and the fourth on-off valve on the hot water supply heat exchanger side are closed respectively during combined hot water supply and cooling operation. , the other on-off valves are opened, and when the heating operation and exhaust heat recovery operation are combined, the third on-off valve, the fourth on-off valve for the indoor unit, and the second on-off valve on the hot water heat exchanger side are opened. The air conditioning/heating/water supply system is closed, other on-off valves are open, and when heating and hot water supply are operated simultaneously, each fourth on-off valve is closed and all other on-off valves are opened.