JPH0282067A - Air conditioning/heating water heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is an air-conditioning/heating water heater that indirectly uses the heat of a hot water boiler as an evaporator during heating, and indirectly uses the heat of the hot water boiler as a heat source during hot water supply. This relates to the refrigerant/water circuit used in

2. Description of the Related Art An example of a refrigerant circuit of a conventional air-conditioning/heating/water heater will be described with reference to FIG.

In FIG. 2, 1 is pressure 1141! , 2 is an accumulator, 3 is a 4-way valve, 4 is an indoor heat exchanger, 6 is an outdoor heat exchanger, 21.22 is a 6B valve for switching the heating/hot water flow path and also has a built-in check valve, 23 24 is a pressure reducer for heating and cooling, 25 is a check valve, and 26 is a heat exchanger for hot water supply.

Next, the operation of the above configuration will be explained.

During heating, the refrigerant discharged from the compressor 1 passes through the four-way valve 3 and the switching solenoid valve 21, condenses in the indoor heat exchanger 4, becomes a high-pressure refrigerant liquid, expands adiabatically in the pressure reducer 23, and becomes an external low-pressure liquid. After it becomes a gas-liquid two-phase state, it evaporates in the indoor heat exchanger 6 and returns to the compressor 1 as a low-pressure refrigerant gas. At this time, the switching solenoid valve 22 is closed.

During cooling, the high-pressure refrigerant gas discharged from the compressor 1 passes through the four-way valve 3 and condenses in the indoor heat exchanger 6, becomes a high-pressure refrigerant liquid, and expands adiabatically in the pressure reducer 23, resulting in a low-pressure gas-liquid two-phase state. Then, it evaporates in the outdoor heat exchanger 4, becomes a low-pressure refrigerant gas, passes through the check valve of the switching solenoid valve 21, and returns to the compressor 1. At this time, the check valve 25 prevents the refrigerant from flowing out to the hot water supply heat exchanger 26, and the switching solenoid valves 21 and 22 are closed.

During hot water supply, the high pressure refrigerant gas discharged from compression m1 is 4
The hot water supply heat exchanger 26 passes through the switching valve 3 and the switching solenoid valve 22.
The circulating city water is heated and condensed to become a high-pressure refrigerant liquid, which undergoes adiabatic expansion in the pressure reducer 24 to become a low-pressure gas-liquid two-phase state, and is evaporated in the outdoor heat exchanger 6 via the check valve 25. , it becomes low pressure refrigerant gas and returns to pressure jlii machine 1.

Problems to be Solved by the Invention Since the air-conditioning and water heaters described above are of the heat pump type, frost forms on the outdoor heat exchanger 6 when the outside temperature is low, so defrosting operation is necessary. As the temperature decreases, heating capacity also decreases. In addition, simultaneous operation of hot water supply and heating is not possible with such a configuration, and if it were to be realized, it would be necessary to increase the output of the compressor, and the refrigerant would flow simultaneously to the hot water supply heat exchanger and the indoor heat exchanger. Since multiple refrigerants are required, countermeasures are also required. Further, even during hot water supply operation, defrosting operation is necessary in order to form frost on the outdoor heat exchanger 6 when the outside temperature is low in winter.

The present invention was made in view of the above-mentioned problems, and there is no defrosting operation, no reduction in heating capacity or hot water supply capacity even at low outside temperatures in winter, and simultaneous operation of heating operation and hot water supply operation, and simultaneous operation of cooling operation. To provide an air-conditioning/heating water heater that can perform hot water supply operation at the same time.

Means for Solving the Problems In order to solve the above problems, the air conditioning/heating water heater of the present invention includes a compressor, a four-way valve, an indoor heat exchanger, a water/refrigerant heat exchanger, a flow path switching means, a pressure reducer, an outdoor A refrigerant circuit for air conditioning and heating is configured by a heat exchanger, the outdoor heat exchanger and the water/refrigerant heat exchanger are provided in parallel, and a flow path switching means is provided at the confluence point of each refrigerant circuit to communicate with the pressure reducer. On the other hand, the water/refrigerant heat exchanger, hot water boiler, hot water heat exchanger, and circulation pump are connected in a ring to form a hot water/heating water circuit, and city water is circulated through the hot water heat exchanger. This configuration has a configuration that allows

Effect of the present invention With the above configuration, the water heated in the hot water boiler circulates through the water/refrigerant heat exchanger, the water/refrigerant heat exchanger is used as an evaporator during heating operation, and the refrigerant absorbs heat from the circulating water. Therefore, if the heating amount of the hot water boiler is constant, there will be no reduction in heating capacity even at low outside temperatures in winter, and no defrosting operation is required.

During hot water supply operation, when the water heated by the hot water boiler circulates through the hot water heat exchanger, it heats the city water that has circulated to the hot water heat exchanger. Since the hot water supply circuit is unrelated to the heat pump circuit, it is unrelated to the drop in hot water supply capacity or defrosting operation in winter.

In addition, when heating operation and hot water supply operation are operated at the same time, it is possible to increase the heating amount of the hot water boiler and provide sufficient heat to both the hot water heat exchanger and the water/refrigerant heat exchanger. Simultaneous operation of operation and hot water supply operation is also possible.

Embodiment Hereinafter, an air conditioning/heating water heater according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a refrigerant/water circuit of an air conditioning/heating/water heater according to an embodiment of the present invention.

In Fig. 1, 1 is a compressor, 2 is an accumulator,
3 is a four-way valve, 4 is an indoor heat exchanger, 5 is a pressure reducer, 6 is an outdoor heat exchanger, 11 is an electric three-way valve, 7 is a water/refrigerant heat exchanger,
8 is a hot water boiler, 10 is a heat exchanger for hot water supply, 9 is a circulation pump, and 12 is a check valve.

The operation will be explained using the above configuration.

During cooling operation, the high pressure refrigerant gas discharged from compressor 1 is 4
It is condensed in the outdoor heat exchanger 6 through the direction valve 3 to become a high-pressure refrigerant liquid, and is adiabatically expanded in the pressure reducer 5 through the electromagnetic three-way valve 11 whose flow path is switched to the outdoor heat exchanger 6 side to become a low-pressure refrigerant. It becomes a gas-liquid two-phase state, evaporates in the indoor heat exchanger 4, becomes low-pressure refrigerant gas, and returns to the compressor 1. The check valve 12 is for preventing high-pressure refrigerant gas from flowing into the water/refrigerant heat exchanger 7 .

During heating operation, the high pressure refrigerant gas discharged from compressor 1 is 4
It is condensed in the indoor heat exchanger 4 via the diversion valve 3 to become a high-pressure refrigerant liquid, and adiabatically expands at reduced pressure H5 to become a low-pressure gas-liquid two-phase state, and the flow path is switched to the water/refrigerant heat exchanger 7 side. electromagnetic 3
Via the direction valve 11, heat is obtained from the hot water in the water/refrigerant heat exchanger 7, and the heat is emitted from the water and returned to the compressor 1 as low-pressure refrigerant gas. At this time, the hot water boiler 8 is in operation, giving heat to the water being circulated by the circulation pump 9.

During hot water supply operation, the water heated by the hot water boiler 8 is used in the hot water supply heat exchanger lO to heat the circulating city water to supply hot water.

Moreover, simultaneous operation of heating operation and hot water supply operation can be achieved by increasing the heating amount of the hot water boiler 8 and supplying sufficient heat to the water/refrigerant heat exchanger and the hot water supply heat exchanger through circulating hot water.

Further, when the cooling operation and the hot water supply operation are performed simultaneously, the refrigerant circuit is used as the cooling circuit, and the heating amount of the hot water boiler 8 in the hot water supply circuit only needs to be the hot water supply bone.

Effects of the Invention As described above, the air conditioning/heating/water heater of the present invention includes a compressor, a four-way valve, an indoor heat exchanger, a water/refrigerant heat exchanger, a flow path switching means,
A refrigerant circuit for air conditioning and heating is configured by a pressure reducer and an outdoor heat exchanger, the outdoor heat exchanger and the water/refrigerant heat exchanger are provided in parallel, and a flow path switching means is provided at the confluence point of each refrigerant circuit. in communication with a pressure reducer, while the water/refrigerant heat exchanger;
A hot water boiler, a hot water heat exchanger, and a circulation pump are connected in a ring to form a hot water/heating water circuit, and city water is circulated through the hot water heat exchanger.

With the above configuration, water heated by the hot water boiler circulates through the water/refrigerant heat exchanger, and this water/refrigerant heat exchanger serves as a base during heating operation, and the refrigerant receives heat from the circulating water. If the heating amount of the hot water boiler is constant, there will be no reduction in heating capacity even at low outside temperatures in winter, and no defrosting operation is required.

During hot water supply operation, when the water heated by the hot water boiler circulates through the hot water heat exchanger, it heats the city water that has circulated to the hot water heat exchanger. Since the hot water supply circuit is unrelated to the heat pump circuit, it is unrelated to the drop in hot water supply capacity or defrosting operation in winter. Furthermore, when the heating operation and the hot water supply operation are performed simultaneously, the heating amount of the hot water boiler may be increased to provide a sufficient amount of heat to both the hot water supply heat exchanger and the water/refrigerant heat exchanger.

Further, when the cooling operation and the hot water supply operation are operated simultaneously, the amount of heating by the hot water boiler is only for the hot water supply, and the refrigerant circuit and the water circuit may be operated at the same time. The present invention provides an air-conditioning/heating/water heater having such advantages.

[Brief explanation of the drawing]

FIG. 1 is a refrigerant circuit and water circuit diagram of an air-conditioning/heating water heater according to an embodiment of the present invention, and FIG. 2 is a refrigerant circuit diagram of a conventional air-conditioning/heating water heater IIIm. ■...Compressor, 2...Accumulator, 3...4-way valve, 4...Indoor heat exchanger, 5...Pressure reducer , 6...Outdoor heat exchanger, 7...Water/refrigerant heat exchanger, 8...Hot water boiler, 9...Circulation pump, lO... ...
・Hot water heat exchanger, 11... Solenoid 3-way valve, 12.
·····non-return valve.

Claims (1)

[Claims] A refrigerant circuit for air conditioning and heating is composed of a compressor, a four-way valve, an indoor heat exchanger, a water/refrigerant heat exchanger, a flow path switching means, a pressure reducer, and an outdoor heat exchanger, and the outdoor heat exchanger and the water/refrigerant Heat exchangers are provided in parallel, and a flow path switching means is provided at the confluence point of each refrigerant circuit to communicate with the pressure reducer.
A heating and cooling water heater in which a refrigerant heat exchanger, a hot water boiler, a hot water heat exchanger, and a circulation pump are connected in a ring to form a hot water/heating water circuit, and city water is circulated through the hot water heat exchanger.