JPH0245794B2 - HIITOHONPUSOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat pump device that uses both a liquid such as water and a gas such as air as low heat sources and enables efficient operation according to the load.

For example, there is a heat pump device that uses hot water in a water heat storage tank obtained by a solar system or the like as a low heat source, and forms hot water as a heat source for hot water supply, space heating, or both hot water supply and space heating. This type of heat pump device is effective when the water in the water heat storage tank has a relatively high temperature, but depending on the weather conditions, the air may reach a higher temperature than the water in the water heat storage tank. ,
In this case, it is more effective to use air as a low heat source than the water in the water heat storage tank.

For this reason, a configuration has been proposed in which a heat pump device that uses air as a low heat source is provided separately, and a configuration in which a single heat pump device is provided that uses both water and air in a water heat storage tank as low heat sources.

However, in the case of the former, it is possible to operate using water and air as heat sources simultaneously, but
If the temperature level of one heat source is low, you will have to rely only on the other heat pump, which may result in insufficient capacity.Also, even in the latter case, water and air can be selected at the appropriate time to provide a low heat source. Although it is superior in terms of operating coefficient, it is not possible to make the performance variable;
Furthermore, since it is not possible to operate using both water and air as heat sources at the same time, it is not possible to operate at a capacity that corresponds to the load level, resulting in poor thermal efficiency.

The present invention has been made in view of the above points, and consists of dividing a heat pump circuit, each equipped with a compressor, a primary heat exchanger, and a secondary heat exchanger, into those using gas and liquid as low heat sources. A communication passage is provided that connects the upstream and downstream compressors of each of the divided heat pump circuits, and the refrigerant discharged from the compressor of one heat pump circuit is passed through the communication passage to the other heat pump circuit. In addition, a means for selectively switching to the secondary side heat exchanger of each heat pump circuit is provided, and a communication passage is provided to connect the inflow and outflow sides of the load side paths of the secondary side heat exchanger of each heat pump circuit, and the secondary side of the heat pump circuit on one side By providing a transfer means for selectively sending the heat medium in the load side path of the heat exchanger to the load side path of the secondary heat exchanger of the heat pump circuit on the other side via the communication passage, the above conventional method can be improved. The purpose of the present invention is to provide a heat pump device that eliminates the above disadvantages.

That is, with the above configuration, even if there are a plurality of loads, it is possible to adjust the capacity for each load according to the load level and to operate at a high operating coefficient for each capacity. Specifically, when the load level is relatively high, the refrigerant discharged from both compressors is sent to the heat pump circuit on the higher-temperature, low-heat source side through a communication passage to perform high-capacity, high-operating-coefficient operation. The heat medium is sent to one load or both loads via the load side path of the next heat exchanger and the communication path. On the other hand, when the load level is not so high, the heat pump circuit on the lower heat source side with a higher temperature is operated to perform low capacity and high operation coefficient operation, and the heat pump circuit is to send heat medium to one or both loads.

Note that if both low heat sources have the same temperature, parallel operation can be performed as in the conventional case.

An embodiment of the present invention will be described below based on the drawings.

In the figure, a heat pump circuit 1 whose low heat source is water in a water heat storage tank (not shown) that absorbs solar heat.
is composed of a compressor 2, a four-way switching valve 3, a secondary heat exchanger 4, an expansion valve 5, and a primary heat exchanger 6 for exchanging heat between the water in the water heat storage tank and the refrigerant. A hot water supply pipe is connected to the load side path 7 of the side heat exchanger 4.

In addition, a heat pump circuit 8 that uses air as a low heat source
Compressor 9, four-way switching valve 10, secondary heat exchanger 1
1. Primary side heat exchanger 1 that performs heat exchange through forced convection of airflow by expansion valve 12 and blower 13
4, of which a user-side water circulation path for heating and cooling is connected to the load-side path 15 of the secondary-side heat exchanger 11.

On the other hand, the compressors 2 and 9 of the heat pump circuits 1 and 8
There is a communication pipe 1 on the upstream and downstream sides of the
6 and 17 are connected to each other, and each connection part is further provided with a three-way switching valve 1 as a switching means for selectively switching the refrigerant discharged from the compressor 2 or 9 of one heat pump circuit 1 or 8 to the other heat pump circuit 8 or 1.
8, 19, 20, and 21 are interposed.

In addition, communication pipes 22 and 23 are connected to the inflow and outflow sides of the load-side paths 7 and 15 of the secondary heat exchangers 4 and 11, and furthermore, communication pipes 22 and 23 are connected to the inflow and outflow sides of the load-side paths 7 and 15 of the secondary heat exchangers 4 and 11, and On-off valves 24 and 2 are provided at the upstream and downstream portions of the respective connections as transfer means for selectively sending the usage water flowing through the load side path 7 or 15 to the load side path 15 or 7 of the other secondary heat exchanger 11 or 4.
5, 26, 27, 28, 29, 30, 31 are interposed, and on-off valves 32,
33 is interposed.

Next, the heat pump action will be explained.

For example, when the air has a higher temperature than the water in the water heat storage tank and has a better operating coefficient for the heat pump, and the hot water supply or heating load level is not very large, the compressor 2 is stopped, the compressor 9 is operated, and the If the direction switching valves 20 and 21 are placed in communication with the heat pump circuit 8 side, the refrigerant discharged from the compressor 9 is mixed with hot water in the load side path 15 in the secondary side heat exchanger 11 by almost one compressor. The amount of heat exchanged is the product of the capacity and the operating coefficient. Therefore, if the load is only hot water supply or heating, the on-off valve 3
0, 33, 27, 24, 32, 29 or 2
Opening valves 8, 29, 30, and 31 and closing the other on-off valves corresponds to the capacity of one compressor, respectively, and provides hot water supply or heating output in accordance with the load level. On the other hand, when the load level of hot water supply and heating is very small and they can be performed at the same time, the on-off valves 24, 27, 28, 29, 30, 31, 32, 3
By opening valve 3 and closing the other on-off valves, the hot water obtained in the secondary heat exchanger 11 section is divided into hot water supply and heating purposes, so the output of each is reduced to half of the capacity of one compressor. This corresponds to .

Next, air has a higher temperature than water in the water heat storage tank and is superior in terms of the operating coefficient of the heat pump, but if the hot water supply or heating load level is relatively large, both compressors 2 and 9 should be operated, If the one-way switching valves 18 and 19 are placed in communication with the connecting pipes 16 and 17, and the three-way switching valves 20 and 21 are placed in communication with all three sides, the refrigerant discharged from the compressors 2 and 9 is Since both flow into the heat pump circuit 8, which has a high operating coefficient, the amount of heat exchanged in the secondary heat exchanger 11 is approximately doubled. Therefore, if the load is only hot water supply or space heating, the respective outputs will be equivalent to twice the capacity of one compressor. On the other hand, when the load level of hot water supply and heating is not so large that they can be performed simultaneously, the output of each corresponds to the capacity of one compressor.

On the other hand, the water in the water heat storage tank has a higher temperature than the air and is superior to the operating coefficient of the heat pump.
When the hot water supply or heating load level is not so large, the compressor 9 is stopped, the compressor 2 is operated, and the three-way switching valves 18 and 19 are connected to the heat pump circuit 1 side. The refrigerant discharged from the refrigerant exchanges heat with the hot water in the load-side path 7 in the secondary heat exchanger 4 by an amount equal to the product of the capacity of one compressor and the operating coefficient. Therefore, if the load is only hot water supply or heating, the on-off valves 24, 25, 26, 27 or 26, 3
Opening valves 3, 31, 28, 32, and 25 and closing the other on-off valves corresponds to the capacity of one compressor, respectively, and hot water supply or heating output corresponding to the load level can be obtained. On the other hand, when the load level of hot water supply and heating is very small and they can be performed at the same time, the on-off valves 24, 25, 26, 27, 28, 31, 3
By opening valves 2 and 33 and closing the other on-off valves, the hot water obtained in the four secondary heat exchangers will be divided into hot water supply and heating, so the output of each will be equal to the capacity of one compressor. This corresponds to half of

Next, the water in the water heat storage tank has a higher temperature than air and is superior in terms of the heat pump's operating coefficient, but if the hot water supply or heating load level is relatively large, both compressors 2 and 9 should be operated, If the one-way switching valves 20 and 21 are placed in communication with the connecting pipes 16 and 17, and the three-way switching valves 18 and 19 are placed in a state where all three sides are connected, the refrigerant discharged from the compressors 2 and 9 will be Since both flow into the heat pump circuit 1 having a high operating coefficient, the amount of heat exchanged in the secondary heat exchanger 4 is approximately doubled. Therefore, if the load is only hot water supply or space heating, the respective outputs will be equivalent to twice the capacity of one compressor. On the other hand, when the load level of hot water supply and space heating is not so large that they can be performed simultaneously, the output of each corresponds to the capacity of one compressor.

In addition, when the temperature of the air and the water in the water storage tank are almost the same and both have almost equal operating coefficients and the heating and hot water supply load levels are not so large, both compressors 2 and 9 are operated, and the three-way If the switching valves 18 and 19 are placed in communication with the heat pump circuit 1 side, and the three-way switching valves 20 and 21 are placed in communication with the heat pump circuit 8 side, the refrigerant discharged from the compressors 2 and 9 is It flows into the heat pump circuits 1 and 8 and exchanges heat with the hot water in the load-side paths 7 and 15 in the secondary heat exchangers 4 and 11, respectively, by the amount that can be obtained by multiplying the capacity of one compressor and the operating coefficient. . Therefore, if the on-off valves 32 and 33 are closed and the other on-off valves are opened, the capacity of each compressor corresponds to the capacity of one compressor, and hot water supply and heating output can be obtained in accordance with the load level.

In this way, a low heat source that increases the operating coefficient of the heat pump can be selected at will according to the temperature of the water and air in the water heat storage tank, and the compression function can be varied according to the respective load level. Therefore, it is possible to provide a heat pump device with excellent thermal efficiency and economical efficiency over a wide area.

The operation of the above embodiment is an explanation of heat pump operation, but during refrigeration cycle operation, the lower temperature of the water and air in the water heat storage tank, in other words, the one that can obtain a higher growth coefficient. Just choose your heat source. Further, while cooling operation is performed using the air heat source heat pump circuit 8, hot water can also be supplied using the liquid heat source heat pump circuit 1 at the same time.

Further, although there is one heat pump circuit each using water in the water heat storage source and air as low heat sources, a configuration may be provided in which there are a plurality of each.

In addition, three-way switching valves 18, 19,
20 and 21 are used, but on-off valves can also be used instead. Furthermore, on-off valves 24, 25, 26, 2 can be used as transfer means.
7, 28, 29, 30, 31, 32, and 33 were used, but it goes without saying that a three-way switching valve can also be used instead.

As explained above, according to the present invention, a heat pump circuit each equipped with a compressor, a primary side heat exchanger, and a secondary side heat exchanger is divided into those using gas and liquid as low heat sources. A communication passage is provided to connect the upstream and downstream compressors of each heat pump circuit, and the refrigerant discharged from the compressor of one heat pump circuit is selectively transferred to the other heat pump circuit via the communication passage. Further, a communication passage connecting the inflow and outflow sides of the load side paths of the secondary heat exchanger of each heat pump circuit is provided, and the secondary side heat exchanger of the heat pump circuit on one side is Since the configuration is provided with a transfer means for selectively sending the heat medium in the load-side path through the communication passage to the load-side path of the secondary heat exchanger of the heat pump circuit on the other side, the temperature of the liquid and gas can be reduced. A low heat source that increases the operating coefficient of the heat pump can be selected at will depending on the size of the heat pump.
The operating compression function can be varied according to each load level, and a heat pump device with excellent thermal efficiency and economical efficiency can be provided over a wide area. In addition, compared to when the entire load is covered by liquid heat source operation, equipment such as solar systems and heat storage tanks for liquid heat source operation can be made smaller due to gas heat source operation, reducing initial costs and installation space. can be achieved.

[Brief explanation of drawings]

The figure is a schematic configuration diagram of a heat pump device that is an embodiment of the present invention. 1, 8... Heat pump circuit, 2, 9... Compressor, 4, 11... Secondary side heat exchanger, 6, 14...
Primary side heat exchanger, 7, 15...Load side path, 1
6, 17, 22, 23... connecting pipe, 18, 19,
20, 21...3-way switching valve, 24, 25, 26,
27, 28, 29, 30, 31, 32, 33...
Open/close valve.

Claims (1)

[Claims] 1 Heat pump circuits each equipped with a compressor, a primary heat exchanger, and a secondary heat exchanger are divided into those that use gas as a heat source and those that use liquid as a heat source, and In addition to providing a communication passage connecting the downstream components, a switching means is provided for selectively switching the refrigerant discharged from the compressor of the heat pump circuit on one side to the heat pump circuit on the other side via the communication passage; A communication passage is provided to connect the inflow and outflow sides of the load side path of the secondary heat exchanger of the heat pump circuit, and the heat medium of the load side path of the secondary heat exchanger of the heat pump circuit on one side is connected. A heat pump device comprising a transfer means for selectively sending the heat to the load side path of the secondary heat exchanger of the heat pump circuit on the other side via the passage.