JPH0252789B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air-conditioning/heating-water supply device that is capable of cooling back, heating, and supplying hot water by being driven by a thermal engine.

Conventional air conditioners include, for example, JP-A-56-
As described in Publication No. 960, it consists of a compressor driven by an engine, an indoor heat exchanger, an outdoor heat exchanger, an expander, and a four-way valve. A prime mover that uses the exchanger as an evaporator and the outdoor heat exchanger as a condenser. During heating, the indoor heat exchanger is used as a condenser and the outdoor heat exchanger as an evaporator, and hot water that cools the engine flows through it. Some cooling system auxiliary heat exchangers are installed near at least one side of the indoor heat exchanger and the outdoor heat exchanger, and some air-conditioning/heating water heaters have
As described in Japanese Patent Application Laid-Open No. 56-30567,
There is an air conditioning system equipped with a compressor driven by an engine, and an exhaust heat heat exchanger that uses the exhaust heat of the engine as a hot water supply heat source and as an auxiliary heating heat source for the air conditioning system. Because a refrigerant heat exchanger and an engine exhaust heat heat exchanger are installed inside, two reciprocating pipes are required for each, and a total of four pipes had to be connected on-site. Furthermore, the former device does not have a hot water supply function, and the latter device only uses exhaust heat from the engine as a heat source for hot water supply, and it is difficult to say that either of these is an effective use.

It is an object of the present invention to connect a mechanical unit that houses an engine and a heat pump type refrigerator to an indoor unit that houses an indoor heat exchanger with a minimum of two pipes between the units, while also providing an auxiliary heat source for heating. In addition to using engine exhaust heat as a hot water source, we also use condensed heat from a heat pump type refrigerator in addition to the engine exhaust heat as a hot water source, creating an air conditioning/heating water heater that can instantly draw out hot water with powerful heating from both heat sources. The purpose of this invention is to simplify and miniaturize the device unit, thereby reducing costs, improving reliability, simplifying it, improving maintainability, and improving workability.

In order to achieve this objective, the configuration of the air conditioning/heating/water heating system according to the present invention is such that the air conditioning/heating/water heating system is configured such that a mechanical unit and an indoor unit having an indoor heat exchanger are connected by inter-unit piping, and the system is driven by a thermal engine. a heat pump type refrigerant circuit having a refrigerant compressor for heating and cooling, a heat exchanger for hot water supply, a heat exchanger on the user side and the heat source side, one of which is used as a condenser and the other as an evaporator during cooling and heating, and the heat exchanger on the user side and the heat source side. a cold/hot water circulation circuit having a water-side heat exchanger that exchanges heat with an exchanger, and the indoor-side heat exchanger connected to the water-side heat exchanger via the inter-unit piping; the thermal engine; a hot water heater and an indoor heater that selectively introduce high-temperature wastewater from the engine;
A waste hot water circuit having an outdoor radiator that dissipates heat of the high temperature wastewater outdoors, and a hot water supply circuit having a heat absorber in which city water is heated by the hot water heat exchanger and the hot water radiator. An auxiliary heat exchanger for exchanging heat with the indoor heater is disposed between the water side heat exchanger in the cold/hot water circulation circuit and the inter-unit piping.

With this configuration, during heating and hot water supply, the indoor circulating water heated by the refrigerant is reheated by the exhaust heat of the thermal engine, and only two water pipes are required to connect the indoor unit. At the same time, a commercially available fan coil can be used as an indoor unit, and the number of valves included in the circuit can be minimized to two two-way valves, one three-way valve, and one each of four-way valves.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the air-conditioning, heating, and hot-water supply apparatus according to the present invention will be described below with reference to the drawings.

First, the configuration of the heat pump refrigerant circuit will be explained. The refrigerant compressed by the compressor 2 driven by the thermal engine 1 reaches the four-way valve 3, passes through the hot water heat exchanger 4, and then passes through either the two-way valve 5 or the hot water expander 6. Then, it passes through a heat source side heat exchanger 8 having an outdoor fan 7, and then passes through either a two-way valve 9 or a cooling expander 10, and then passes through a user side heat exchanger 1.
1, it reaches the four-way valve 3, passes through the accumulator 12, and returns to the compressor 2, and is switched by the four-way valve 3 to rotate in the opposite direction as described above.

Next, the configuration of the exhaust hot water circuit of the thermal engine 1 will be explained. A circuit of circulating water sent from the pump 13 and cooling the thermal engine 1 such as the engine is connected to the three-way valve 14.
The three-way valve connects the circuit 16 to the indoor heater 15 and the circuit 1 to the hot water heater 17.
It is branched into 8. The circuit 16 towards the indoor heater 15 passes through the heater and then returns to the pump 13, and the circuit 18 towards the canister heater 17 passes through the hot water heater and then returns to the pump 13. It returns to the pump 13 via an outdoor radiator 20 having an outdoor fan 19.

Next, the hot water supply circuit is configured to run from the city water supply pipe 21, through the pressure reducing check valve 22, through the hot water heat exchanger 4 and the heat absorber 23 heated by the hot water heater 17, and to the faucet 24. There is.

Next, the cold/hot water circulation circuit is the indoor circulating water pump 2.
Water side heat exchanger 26 with which the circulating water sent out from 5 exchanges heat with the user side heat exchanger 11, and indoor side heater 1
Auxiliary heat exchanger 27 heated by 5, indoor fan 2
Pump 25 via indoor heat exchanger 29 with 8
It is configured to return to 30 is an indoor unit, 31 is a mechanical unit installed outdoors, 3
Reference numerals 2 and 33 indicate inter-unit piping that is connected on-site.

Next, the operations of the heat pump refrigerant circuit, hot water exhaust circuit, hot and cold water circulation circuit, and hot water supply circuit during cooling, heating, hot water supply, and defrosting operations will be explained.

(1) Explanation during cooling operation (a) High-pressure refrigerant from the high-pressure discharge port of the compressor 2 driven by the thermal engine 1 passes through the four-way valve 3 and is pre-condensed in the hot water supply heat exchanger 4. It passes through the two-way valve 5 and is condensed in the heat source side heat exchanger 8 and the outdoor fan 7. Next, the cooling expander 10
After expansion, it is evaporated in the heat exchanger 11 on the utilization side. After evaporation, the refrigerant passes through the four-way valve 3 and enters the compressor 2.
It is sucked in from the low pressure suction port.

(b) The indoor circulating water pump 25 of the cold/hot water circulation circuit is operated, and the circulating water is cooled by the water-side heat exchanger 26, passes through the auxiliary heat exchanger 27, and then passes through the indoor-side heat exchanger 29 to be returned to the room. The cooled water is cooled by the fan 28 and sucked into the indoor circulating water pump 25.

(c) Cooling water discharged from the pump 13 of the exhaust hot water circuit cools the thermal engine 1, passes through the three-way valve 14, radiates heat in the hot water heater 17 during hot water supply, and then flows to the outdoor radiator 20. When hot water is not being supplied, heat is radiated by the outdoor fan 19. The cooling water is then sucked into the pump 13.

(2) Explanation during heating operation (a) High-pressure refrigerant from the high-pressure discharge port of the compressor 2 driven by the thermal engine 1 passes through the four-way valve 3 and is condensed in the heat exchanger 11 on the user side, where it is expanded for cooling. It expands in the vessel 10, evaporates in the heat source side heat exchanger 8, and removes heat from the outdoor air by the outdoor fan 7.
After evaporation, the water passes through the two-way valve 5 and the heat exchanger 4 for hot water supply, and is then sucked into the compressor 2 through the four-way valve 3.

(b) Indoor circulating water from the indoor circulating water pump 25 is warmed in the water side heat exchanger 26, reheated in the auxiliary heat exchanger 27, and passed through the indoor heat exchanger 29 to the fan 28. This warms the room and is sucked into the indoor circulating water pump 25.

(c) Cooling water discharged from the pump 13 of the hot water exhaust circuit cools the thermal engine 1, passes through the three-way valve 14, radiates heat at the indoor heater 15, and is sucked into the pump 13.

(3) Explanation during hot water supply operation (a) High pressure refrigerant from the high pressure discharge port of the compressor 2 driven by the thermal engine 1 passes through the four-way valve 3 and is condensed in the hot water supply heat exchanger 4, and then transferred to the hot water supply expander. 6
After expansion, it evaporates in the heat exchanger 8 on the heat source side, and the fan 7 removes heat from the atmosphere. After that, it passes through the two-way valve 9, the user-side heat exchanger 11, and is sucked into the compressor 2 from the four-way valve 3.

(b) The indoor circulating water pump 25 is stopped.

(c) Cooling water discharged from the pump 13 of the hot water exhaust circuit cools the thermal engine 1, passes through the three-way valve 14, radiates heat in the hot water heater 17, and is then transferred to the outdoor radiator 2.
After passing through 0, it is sucked into the pump 13 of the exhaust hot water circuit.

(d) In the hot water supply circuit, the pressure from the city water connection is reduced by a pressure reducing check valve 22, heated by a heat absorber 23, and then returned to the faucet 2.
Release from 4.

(4) Explanation during defrosting operation (a) During heating operation, frost forms on the heat source side heat exchanger 8 due to a drop in outside temperature. At this time, the high-pressure refrigerant from the high-pressure discharge port of the compressor 2 driven by the thermal engine 1 is passed through the hot water supply heat exchanger 4 and the two-way valve 5 by the four-way valve 3 to remove frost from the heat exchanger 8 on the heat source side. Condensate by melting. The refrigerant then passes through the cooling expander 10, evaporates in the user-side heat exchanger 11, and is sucked into the compressor 2 through the four-way valve 3.

(b) Indoor circulating water and thermal engine cooling water are operated in the same way as during heating operation. The water side heat exchanger 26 is cooled by the user side heat exchanger 11 acting as an evaporator, but the auxiliary heat exchanger 27 is heated by the indoor side heater 15, so the indoor temperature is lowered. Heating operation continues without any interruption.

Since the air conditioning/heating/hot water supply apparatus according to the present invention is configured as described above, it has the following effects.

(1) During heating, the indoor circulating water (heating water) heated by the refrigerant in the water-side heat exchanger 26 is transferred to the auxiliary heat exchanger 2.
At step 7, reheating is performed using the exhaust heat of the thermal engine, so high-temperature water is obtained and comfortable heating can be expected.

(2) Indoor heater 15 without using cold/hot water circulation circuit
If the indoor unit 30 is provided with the user-side heat exchanger 11, a total of four pipes will be required between the units, but as in the present invention, the auxiliary heat exchanger 27, which exchanges heat with the indoor heater 15, is used to circulate cold and hot water. By disposing it between the water side heat exchanger 26 and the inter-unit piping 32 in the circuit, only two inter-unit piping 32, 33 are needed to connect to the indoor heat exchanger 29, making the piping connection work easy. be.

In addition, when the inter-unit piping is a refrigerant piping, the refrigerant pressure loss increases and the heating and cooling capacity decreases as the piping becomes longer, so the inter-unit piping cannot be made very long.However, in the present invention, the inter-unit piping 32,
Since the numeral 33 is a water pipe, the length of the pipe can be made long, so the indoor unit 30 can be installed at any location, and since a commercially available file coil can be used as the indoor unit 30, it is inexpensive.

(3) It is highly reliable because it only includes a minimum number of valves: two two-way valves, one three-way valve, and one four-way valve.

(4) Since the hot water supply water is indirectly heated by the hot water supply heat exchanger 4 and the hot water supply heater 17, it is safe even if there is a leak in the refrigerant circuit, the thermal engine exhaust hot water circuit, etc.

[Brief explanation of the drawing]

The drawing is a system diagram showing the configuration of a heat pump type refrigerant circuit, a thermal engine exhaust hot water circuit, a hot water supply circuit, and a cold/hot water circulation circuit of the air conditioning/heating/hot water supply apparatus according to the present invention. 1...Thermal engine, 2...Compressor, 4...Hot water supply heat exchanger, 8...Heat source side heat exchanger, 11...Usage side heat exchanger, 15...Indoor heater, 17... ...Hot water heater, 20...Outdoor heat radiator, 23...Heat absorber, 26...Water side heat exchanger, 27...Auxiliary heat exchanger, 29...Indoor heat exchanger.

Claims (1)

[Claims] 1 In an air-conditioning/heating/water supply system in which a mechanical unit and an indoor unit having an indoor heat exchanger are connected by inter-unit piping, a refrigerant compressor driven by a thermal engine, a heat exchanger for hot water supply, and a A heat pump type refrigerant circuit having a user side heat exchanger and a heat source side heat exchanger, each of which is used as a condenser and the other as an evaporator, a water side heat exchanger that exchanges heat with the user side heat exchanger, and the water side heat exchanger. a cold/hot water circulation circuit having a side heat exchanger and the indoor heat exchanger connected via the inter-unit piping; the thermal engine; a hot water heater that switches and introduces high-temperature wastewater from the engine; A hot water waste circuit having an indoor heater and an outdoor radiator for discharging the heat of the high-temperature wastewater outdoors, and a heat absorber in which city water is heated by the hot water heat exchanger and the hot water heater. and a hot water supply circuit having a hot water supply circuit, and an auxiliary heat exchanger that exchanges heat with the indoor heater is disposed between the water side heat exchanger in the cold and hot water circulation circuit and the inter-unit piping. Air conditioning, heating, and hot water equipment.