JPS6152567A - Air-conditioning, hot-water supply and refrigeration heat pump device - 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 relates to an air-conditioning/hot-water supply/refrigeration heat pump device that is capable of air-conditioning and heating of water in a hot water storage tank.

[Conventional technology]

Conventionally, there is a heat pump system for air conditioning and heating as shown in Figure 2, and a heat pump system for air conditioning and hot water supply as shown in Figure 2.
There was a refrigeration system shown in Figure 4, and a refrigeration system shown in Figure 4. In the refrigerant circuit of the heat pump device shown in Figs. 2 and 3, reversal valves were connected to the compressor 1, the four-way valve 2 for switching between cooling and heating, and the indoor heat exchanger 3\expansion valves 4a and 4b, respectively. In FIG. 3, a refrigerant reversible flow expansion mechanism 4 with parallel piping and an outdoor heat exchanger 5 are provided. In FIG. The coil, 8 is the city water intake to the hot water storage tank 6, and 9 is the faucet for hot water supply.1 In the heat pump device shown in FIG. 3 and a heating coil 7 are provided in parallel, each of which is connected to the four-way valve 2 via a solenoid valve 10, 11. The refrigerant circuit 12 of the refrigeration system shown in FIG. 4 includes a compressor 13 and a condenser 14.
, an expansion mechanism 15, and an evaporator 16 are connected by piping, and the evaporator 16 is installed in an interior 17 of a refrigerator or the like.

Next, the operations of the heat pump device shown in FIGS. 2 and 3 and the refrigeration device shown in FIG. 4 will be explained.

The heat pump device shown in Fig. 2 cools and heats a room. During cooling, high-temperature, high-pressure refrigerant gas discharged from the compressor l flows as shown by the solid arrow in the figure, passing through the four-way valve 2 and the outdoor heat exchanger 5. At this point, it is cooled and condensed. The condensed high-pressure refrigerant liquid passes through one expansion valve 4a of the expansion mechanism 4, is depressurized, and flows into one indoor heat exchanger 3 as a refrigerant. Expansion valve 4a
The low-pressure refrigerant liquid is evaporated in the indoor heat exchanger 3, removes heat from the room, and is gasified. This low pressure refrigerant gas is transferred to the four-way valve 2
During heating, the high-temperature, high-pressure refrigerant gas discharged from the compressor 1 flows as shown by the dashed arrow in the figure and enters the four-way valve 2X indoors. The heat exchanger 3 is reached, where the heat is radiated and condensed to perform heating. The condensed high-pressure refrigerant liquid is depressurized through the other expansion valve 4b of the expansion mechanism 4, and the depressurized refrigerant liquid reaches the outdoor heat exchanger 5, where it is heated by the outside air and evaporated. This low-pressure refrigerant gas passes through the four-way valve 2, is sucked into the compressor 1, and is compressed.The same cycle is repeated below. A heating coil 7 for heating the water in the hot water storage tank 6 is installed at
is opened, the four-way valve 2 is set to the heating side, and during heating and cooling, the solenoid valve 10 on the indoor heat exchanger 3 side is opened, and the solenoid valve 11 on the heating coil 7 side is closed. The operations of the heat pump device shown in FIG. 3 other than those described above are the same as those of the heat pump device shown in FIG. 3.

In the refrigeration system shown in FIG. 4, the high-pressure refrigerant gas discharged from the compressor 13 of the refrigerant circuit 12 radiates heat in the condenser 14 and is condensed and liquefied. This refrigerant liquid passes through the expansion mechanism 15 to the evaporator 16
[Problems to be Solved by the Invention] A conventional heat pump device as shown in FIG.
In order to heat the water in the hot water tank, a heating coil 7 installed in parallel with the indoor heat exchanger 3 is inserted into the hot water tank 6, and the water in the hot water tank 6 is heated by the heating coil 7. Therefore, there was a problem in that the water in the hot water storage tank 6 could not be heated by recovering waste heat during cooling. Furthermore, the refrigeration system shown in FIG. 4 has an independent refrigerant circuit that is completely separate from the above-mentioned air conditioning/hot water supply heat pump system, so the heat discharged by the condenser 14 cannot be recovered and used. There was a problem.

This invention is an attempt to solve the above-mentioned conventional problems, and makes it possible to perform air conditioning and heating at the same time, as well as to recover waste heat from cooling and use it as a heating source for hot water supply. The purpose of this project is to provide an air-conditioning, hot-water supply, and refrigeration heat pump device that can also recover waste heat generated from water and use it as a heat source for hot water supply.

Means for Solving Problem C] In the air conditioning, hot water supply, and refrigeration heat pump device of the present invention,
The first refrigerant circuit for air conditioning/heating has the discharge side of the compressor connected via a first switching valve to a four-way valve and a heating coil in the hot water storage tank, and the outlet side of the heating coil connected to a second switching valve. The condenser installed in the second refrigerant circuit of the refrigeration system, which is independent from the refrigerant circuit of if, is connected so that the refrigerant flows to one of the indoor heat exchanger and the outdoor heat exchanger. It is installed in the tank at approximately the same height as the heating coil.

[For production]

In this invention, the first refrigerant circuit, which is the main heat source for air conditioning and hot water supply, allows refrigerant to flow from the discharge side of the compressor through the four-way valve and at least one of the heating coils in the hot water storage tank, through the switching valve of the kit. , the refrigerant can flow from the heating coil to either the indoor heat exchanger or the outdoor heat exchanger via the second switching valve, so by switching the 11th and 2nd switching valves, heating and cooling and hot water heating can be performed at the same time. In addition, the waste heat from cooling can be used to heat the water in the hot water tank. Furthermore, in this invention, the refrigerant circuit of the refrigeration system is made into a second refrigerant circuit, and the waste heat discharged from the condenser of this circuit by cooling the inside of the refrigeration system is used to cool the water in the hot water storage tank. [Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be explained with reference to Fig. 1.◎ In Fig. 1, 1 is a compressor, 2 is a four-way valve for switching between air conditioning and heating, and 3 is an indoor A heat exchanger, 4 is an expansion mechanism, and 5 is an outdoor heat exchanger, these are provided in the first refrigerant circuit 18 similarly to the conventional refrigerant circuit shown in FIG. 6 is a hot water storage tank, and 19 is a first switching valve, that is, a first three-way valve provided in the Ml refrigerant circuit 18. The first three-way valve 19 has an inlet branch 19a connected to the discharge side piping of the compressor 1,
One branch 19b of the outlet is connected to the four-way valve 2, and the other branch 19c of the outlet is connected to the heating coil 7 inserted into the hot water storage tank 6 via piping 20. The piping 21 on the outlet side of the heating coil 7 is a second switching valve, that is, a second three-way valve 22
The pipe 23 from one branch 22b of the outlet of the second three-way valve 22 is connected to the pipe between the four-way valve 2 and the indoor heat exchanger 3. A pipe z4 from the other outlet branch 22c is connected to the pipe between the four-way valve 2 and the outdoor heat exchanger 50.

Further, 8 is a city water intake port communicating with the lower part of the hot water storage tank 6, 9 is a hot water supply faucet communicating with the upper part of the hot water storage tank 6, 25 is an inverter for controlling the capacity of the compressor 1), and 26 is a first inverter. This is a control device that controls the second three-way valve 19.22 and the four-way valve 2.

Reference numeral 12 denotes a second refrigerant circuit that is configured independently of the above-mentioned second refrigerant circuit 18. The second refrigerant circuit 12 is a refrigerant circuit of a refrigeration system, and a compressor 13, a condenser 14, an expansion mechanism 15, and an evaporator 16 are connected by piping, and the evaporator 16 is installed in a refrigerator 17 such as a freezer. Along with being
A condenser 14 is arranged in the hot water storage tank 6 at the same height as the heating coil 7.

Next, the operation of the heat pump device of this embodiment will be explained.

During heating, the refrigerant gas discharged from the compressor 1 of the first refrigerant circuit 18 is divided into branches 19a and 19b by the first three-way valve 19.
Since the connections are made, four-way valve 2 is connected from branches 1 and 9 b.
It flows as shown by the broken line arrow in FIG. 1 via the flow path indicated by the broken line, and reaches the indoor heat exchanger 3, where it contracts and becomes a refrigerant liquid. The refrigerant liquid passes through the expansion mechanism 4, evaporates in the outdoor heat exchanger 5, and returns to the compressor 1 via the flow path indicated by the broken line in the four-way valve 2. During heating and hot water supply, the refrigerant liquid passes through the compressor of the first refrigerant circuit 18. By switching the first three-way valve 19, a portion of the refrigerant gas discharged from the refrigerant gas 1 flows in the same manner as during heating described above. At the same time, since the first three-way valve 19 is also connected to the branches 19a and 190, the other part of the refrigerant gas is transferred to the branch 190.
The heating coil 7 heats the water in the hot water storage tank 6, and part of it condenses and becomes a refrigerant liquid, while the other part does not condense and remains as a refrigerant gas, and these refrigerants are transferred to the pipe. 21 and 23, joins with the refrigerant liquid that has passed through the indoor heat exchanger 3, and thereafter flows in the same manner as during heating and returns to the compressor 1. Also, during heating and hot water supply, the first three-way valve 19 is connected to the branch 19 in the same way as during heating.
A and 19b are connected, and when the room temperature rises to a set value using an indoor temperature detector such as a thermostat (not shown), the first three-way valve 19 is switched to branch 19a.
and 19c, the water in the hot water storage tank 6 may be heated by the heating coil 7, and a selective operation between heating and hot water heating may be performed in which the heating is returned to when the room temperature falls below a set value. Further, the first three-way valve 19 may be switched to connect the branches 19a and 19b1 and the branches 19a and 19c at short intervals using a timer or the like, and the refrigerant may be time-divided into heating and hot water supply.

During cooling, the refrigerant gas discharged from the compressor 1 of the first refrigerant circuit 18 is routed through the first three-way valve 19 into branches 19a and 19c.
Since the refrigerant is connected as shown in FIG. 1, it flows through the solid line flow path of the four-way valve 2 as shown by the solid line arrow in FIG. The refrigerant liquid passes through the expansion mechanism 4 and reaches the internal heat converter 3, where it evaporates and becomes refrigerant gas.
Return to

During cooling and hot water supply, the refrigerant gas discharged from the compressor 1 of the first refrigerant circuit 18 is guided to the heating coil 7 because the first three-way valve 19 is connected to the branches 19a and 19c. The water in the hot water storage tank 6 is heated so that some or all of the water is condensed, and the water is transferred from the pipe 21 to the branch 22 at the outlet of the second three-way valve 22.
c, the refrigerant is led to the outdoor heat exchanger 5, where even if some of the refrigerant does not condense, all of the refrigerant is liquefied, and the refrigerant liquid passes through the expansion mechanism 4 and reaches the indoor heat exchanger 3, where it It evaporates and becomes refrigerant gas, which returns to the compressor 1 via the solid line flow path of the four-way valve 2. At this time, the blower of the outdoor heat exchanger 5 adjusts its heat exchange capacity by stopping or changing the rotation speed depending on the liquefaction state of the refrigerant flowing into the outdoor heat exchanger 5, thereby making it more effective. This enables smooth driving. In this way, conventionally, all of the condensed heat of the refrigerant was disposed of as waste heat in the outdoor heat exchanger 5 during cooling, but in this heat pump device, by making the refrigerant flow as described above, waste heat is removed during cooling. The heat is effectively recovered as a heating source for the water in the hot water storage tank 6.

When heating hot water, the refrigerant gas discharged from the compressor 1 is
Since the three-way valve 19 is connected to the branches 19a and 19c, the water in the hot water storage tank 6 is heated through the heating coil 7, and some or all of the water is condensed, and then the refrigerant is in a condensed state. The flow path of the second three-way valve 22 can be selected depending on the temperature and outside temperature. That is, when the outside temperature is low, the refrigerant can flow through the heating/hot water supply route, and when the outside temperature is high, the refrigerant can flow through the cooling/hot water supply route.

For example, when the outside temperature is low, the refrigerant flows through the second three-way valve 2.
From the branch 22b of 2, it passes through the indoor heat exchanger 3, passes through the expansion mechanism 4, and reaches the outdoor heat exchanger 5, where it evaporates and becomes refrigerant gas. Make it go back to 1.

The second refrigerant circuit 12 provided in the refrigeration system is connected to the first refrigerant circuit 12.
The condenser 1 operates almost independently from the refrigerant circuit 18 of the refrigerator, and the waste heat generated by cooling the interior 17 of the refrigerator with the evaporator 16 is disposed in the hot water storage tank 6.
4 heats the water in the hot water tank 6. In this case, if the water temperature in the hot water storage tank 6 becomes high, the efficiency of the refrigeration system will decrease, so a condenser 14 is installed in the lower part of the hot water storage tank 6 to prevent the water temperature near this from rising above a predetermined value. Therefore, if the first refrigerant circuit 18 is controlled to suppress the hot water heating operation, the efficiency of the heat pump device as a whole can be increased and the reliability of the operation of the second refrigerant circuit 12 can be increased.

In addition, in this embodiment, the above-mentioned heating and heating are used.

The operation of hot water supply, cooling, cooling/hot water supply, and hot water supply heating is controlled by the control device 26 from the first. This is done by controlling the second three-way valve 19,22 and the four-way valve 2. Also, compressor 1
Capacity control is performed by changing the frequency of the drive power source for the compressor 1 using the inverter 25.

In the embodiment described above, there is one indoor heat exchanger 3, but
This invention may include two or more indoor heat exchangers. In the embodiment, the first three-way valve was used as the switching valve, but in the present invention, two two-way valves may be used as the switching valve to perform the same operation, and a switching valve such as the first three-way valve may be used as the switching valve. The expansion mechanism of the first refrigerant circuit may be closed with an electric valve that can adjust the flow rate, and the opening degree of the expansion mechanism of the first refrigerant circuit can be adjusted according to the refrigerant flow rate, and the refrigerant inflow direction can be either the left or the right as shown in Figure 1. The use of electric expansion valves allows for more efficient operation. In the embodiment, the indoor/outdoor heat exchanger is an air type, but the present invention may use a water type indoor/outdoor heat exchanger. In the embodiment, the capacity of the compressor is controlled by an inverter, but in the present invention, the capacity may be controlled by dividing the compressor into a plurality of units and operating only the necessary number of units using a control device. .

〔Effect of the invention〕

As explained above, the air conditioning/hot water heat pump device of the present invention connects the discharge side of the compressor provided in the first refrigerant circuit for air conditioning and heating to the four-way valve and the heating coil provided in the hot water storage tank. A second switching valve is connected to the outlet side of the heating coil to the pipe connecting the indoor heat exchanger and the four-way valve, and to the pipe connecting the outdoor heat exchanger and the four-way valve. Since the branch connection is made through the first refrigerant circuit, it is possible to simultaneously perform air conditioning, heating and hot water heating with simple piping, and the waste heat from cooling can be used to heat the water in the hot water storage tank. Since the condenser installed in the refrigerant circuit of No. 2 is placed in the hot water storage tank at almost the same height as the heating coil, waste heat from the refrigeration system is recovered to heat the water in the storage tank. It is also possible to obtain an economical effect.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an example of a heating/cooling/hot water supply heat pump device according to the present invention, Fig. 2 is a block diagram showing an example of a conventional heat pump device for cooling/heating/hot water supply, and Fig. 3 is an example of a conventional heat pump device for heating/cooling/hot water supply. Fig. 4 is a block diagram showing an example of a conventional refrigeration system. 1... Compressor, 2... Four-way valve, 3... Window heat exchanger, 4... Expansion mechanism, 5... Outdoor heat exchanger, 6...
・Hot water storage tank, 7... Heating coil, 13... Compressor, 1
4... Condenser, 15... Expansion @ structure, 16... Evaporator, 17... Inside the refrigerator, 18... First refrigerant circuit, 19
．． 22...1st. 2nd switching valve, 25...inverter, 26... control device. In addition, the same reference numerals in the figures indicate the same or common parts.O Agent Masuo Oiwa (and 2 others) Figure 2 4b No. 31! T b Procedural amendment (voluntary)

Claims (7)

[Claims] (1) It has a first refrigerant circuit for heating and cooling, a second refrigerant circuit of the refrigeration system that is independent from the first refrigerant circuit, and a hot water storage tank, and the first refrigerant circuit has a compressor, a heating and cooling switch, and a hot water storage tank. A four-way valve, an indoor heat exchanger, a refrigerant reversible expansion mechanism, and an outdoor heat exchanger are connected by piping, and the discharge side of the compressor is connected to the four-way valve and a thermal coil installed in the hot water storage tank. A branch connection is made to the heating coil through the first switching valve, and the outlet side of the heating coil is connected to the
The second refrigerant circuit is branch-connected to the pipe connecting the indoor heat exchanger and the four-way valve and the pipe connecting the outdoor heat exchanger and the four-way valve via a second switching valve. An air conditioning, hot water supply, and refrigeration heat pump device characterized in that an expansion mechanism and an evaporator are connected by piping, and a condenser is disposed in a hot water storage tank at approximately the same height as the heating coil. (2) The capacity of the compressor of the first refrigerant circuit is controlled by an inverter that varies the frequency of its driving power source. heat pump equipment. (3) The compressor of the first refrigerant circuit is divided into a plurality of small-capacity compressors, and only the necessary number of compressors are operated by a control device to control the capacity. The air conditioning, hot water supply, and refrigeration heat pump equipment described. (4) During simultaneous operation of hot water heating, cooling, and hot water heating,
The first switching valve connects the discharge side of the compressor with the heating coil;
The second switching valve connects the outlet side of the heating coil to the pipe connecting the outdoor heat exchanger and the four-way valve, and passes through the outdoor heat exchanger, expansion mechanism, indoor heat exchanger, and four-way valve to the suction side of the compressor. The cooling/heating/hot water supply/refrigeration heat pump device according to claim 1, wherein the refrigerant is circulated through the route. (5) During the heating/hot water heating selection operation, the first switching valve connects the discharge side of the compressor to the four-way valve, so that the refrigerant flows from the compressor to the indoor heat exchanger to perform heating, and the heating operation is performed indoors. While stopped by the temperature sensor, the first switching valve connects the discharge side of the compressor to the heating coil, and the refrigerant from the compressor passes through the heating coil and returns to the indoor heat via the second switching valve. The air conditioning, hot water supply, and refrigeration heat pump device according to claim 1, wherein the heat pump device is configured to flow through an exchanger. (6) During simultaneous heating and hot water heating operation, the first switching valve connects the discharge side of the compressor to the indoor heat exchanger via the four-way valve, and the first switching valve connects the discharge side of the compressor to the heating coil. The air-conditioning, hot water supply, and refrigeration heat pump device according to claim 1, wherein the air conditioning, hot water supply, and refrigeration heat pump device is connected to the piping that connects the indoor heat exchanger and the four-way valve via the second switching valve. (7) During simultaneous heating and hot water heating operation, the first switching valve switches and connects the discharge side of the compressor between the four-way valve side and the heating coil side at short intervals, and the second switching valve connects the compressor to the four-way valve side and the heating coil side. The cooling/heating, hot water supply, and refrigeration heat pump device according to claim 1, wherein the refrigerant flows into the indoor heat exchanger from the outlet side, and heating and hot water supply and heating are performed alternately.