JP2000257975A - Heat pump system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively utilize a night-time power by utilizing ice storage heat and hot water storage heat, by mounting a second pressure reducing mechanism and a thermal storage tank for both the ice heat and the hot water storage heat in a heat pump system. SOLUTION: Branched refrigerant piping 8 is connected to a second expansion valve (second pressure reducing mechanism) 16. A thermal storage tank 18 for both a refrigerant supercooling type ice storage heat and a hot water storage heat is connected to the valve 16 by a refrigerant piping 17. Refrigerant piping 9 is connected to the piping 17 via a solenoid opening/closing valve 19. Refrigerant piping 20 is connected to the tank 18. The piping 20 is branched to three refrigerant pipings 21, 22 and 23. The piping 21 is connected between a solenoid opening/closing valve 10 and a first expansion valve 11 of refrigerant piping 7, and the piping 22 is connected between an indoor heat exchanger 13 and the valve of a refrigerant piping 14. The piping 23 is connected between a solenoid opening/closing valve 15 and a compressor 1 of the piping 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump system used in a house or the like which enables cooling, heating, ice heat storage, hot water heat storage and various simultaneous operations.

[0002]

2. Description of the Related Art Conventionally, as a residential heat pump system, a heat pump system capable of supplying heat pump hot water and utilizing the exhaust heat of cooling for hot water supply heating, and a system in which cold water is stored in a hot water storage tank to level the power load. Various things have been proposed.

[0003]

Further, even now, there is a demand for further leveling of the power load and energy saving at the peak of the air conditioning load. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heat pump system that can effectively use nighttime electric power by using ice heat storage and hot water heat storage. is there.

It is another object of the present invention to provide a heat pump system which can cope with a refrigerant leak due to piping work during installation or repair.

[0005]

According to a first aspect of the present invention, there is provided a heat pump system comprising a compressor, an outdoor heat exchanger, a first pressure reducing mechanism, and an indoor heat exchanger. And a second decompression mechanism,
A heat storage tank for both ice heat storage and hot water heat storage is interposed, and a refrigerant is circulated therebetween. During the ice heat storage operation, the refrigerant is supplied to the compressor, the outdoor heat exchanger, and the second heat storage tank. The refrigerant is circulated in the order of the pressure reducing mechanism, the heat storage tank, and the compressor, and during the cooling operation, the refrigerant flows through the compressor, the outdoor heat exchanger, the first pressure reducing mechanism, the indoor heat exchanger, and the compressor. During the cooling operation using the ice heat storage, the refrigerant is circulated in the order of the compressor, the outdoor heat exchanger, the heat storage tank, the first pressure reducing mechanism, the indoor heat exchanger, and the compressor. During the hot water heat storage operation, the refrigerant is circulated in the order of the compressor, the heat storage tank, the second pressure reducing mechanism, the outdoor heat exchanger, and the compressor, and during the heating operation using outside air as a heat source, Refrigerant is the compressor, the indoor heat exchanger, the The refrigerant is circulated in the order of the decompression mechanism, the outdoor heat exchanger and the compressor, and during the hot water heat storage utilizing heating operation, the refrigerant flows through the compressor, the indoor heat exchanger, the first decompression mechanism, the heat storage tank, and The compressor is circulated in the order of the compressor.

Further, in the heat pump system according to the present invention, the compressor, the outdoor heat exchanger, the first pressure reducing mechanism, the indoor heat exchanger, the second pressure reducing mechanism, The heat storage tank is characterized by being unitized.

[0007] In the first aspect of the present invention, ice heat storage operation,
Cooling operation, cooling operation using ice storage, hot water storage operation, heating operation using outside air as a heat source, and heating operation using hot water storage can be performed. Therefore, the nighttime electric power is effectively used by using the ice heat storage and the hot water heat storage, so that the power load is leveled at the peak of the air conditioning load and the running cost is reduced by using the cheaper power.

According to the second aspect of the present invention, the compressor, the outdoor heat exchanger, the first pressure reducing mechanism, the indoor heat exchanger, the second pressure reducing mechanism and the heat storage tank are unitized and integrated. Since the refrigerant pipe for circulating the refrigerant between them is housed in the unit and is not required outside, the refrigerant does not leak to the outside of the unit at the time of piping work at the time of installation or repair.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the heat pump system of the present invention will be described below with reference to the drawings. FIG.
FIG. 3 is a refrigerant circuit diagram of the heat pump system according to the present embodiment. In the figure, reference numeral 1 denotes a compressor,
A plate fin type outdoor heat exchanger 4 provided with a propeller type blower 3 is connected to a discharge side of the compressor 1 by a refrigerant pipe 2 through which a refrigerant such as R-22 (Freon) flows. . An electromagnetic on-off valve 5 is interposed in the refrigerant pipe 2.

A refrigerant pipe 6 is connected to the outdoor heat exchanger 4, and this refrigerant pipe 6 is branched into three refrigerant pipes 7, 8, and 9. The branched refrigerant pipe 7 is connected to the solenoid on-off valve 1
0 is connected to a first expansion valve (first pressure reducing mechanism) 11. The first expansion valve 11 is connected to an indoor heat exchanger 13 provided with a double suction sirocco type blower 12. The indoor heat exchanger 13 is connected to the compressor 1 by a refrigerant pipe 14. An electromagnetic on-off valve 15 is interposed in the refrigerant pipe 14.

The branched refrigerant pipe 8 is connected to a second expansion valve (second pressure reducing mechanism) 16. The second expansion valve 16 is connected to a refrigerant supercooling type ice heat storage by a refrigerant pipe 17. And a heat storage tank 18 that also serves as hot water heat storage.
Ice heat storage uses a refrigerant supercooling method. The branched refrigerant pipe 9 is connected to the refrigerant pipe 1 via an electromagnetic opening / closing valve 19.
7 is connected.

A refrigerant pipe 20 is connected to the heat storage tank 18, and the refrigerant pipe 20 has three refrigerant pipes 21, 22;
It branches to 23. The branched refrigerant pipe 21 is connected to the refrigerant pipe 7 between the electromagnetic on-off valve 10 and the first expansion valve 11 via an electromagnetic on-off valve 24. The branched refrigerant pipe 22 is connected to the refrigerant pipe 14 between the indoor heat exchanger 13 and the electromagnetic on-off valve 15 via an electromagnetic on-off valve 25. Further, the branched refrigerant pipe 23 is connected between the electromagnetic on-off valve 15 and the compressor 1 in the refrigerant pipe 14 via an electromagnetic on-off valve 26.

One end of a refrigerant pipe 27 is connected between the compressor 1 and the electromagnetic on-off valve 5 in the refrigerant pipe 2. It is connected to the exchanger 13 side. An electromagnetic on-off valve 28 is interposed in the refrigerant pipe 27. Also, the electromagnetic on-off valve 5 and the outdoor heat exchanger 4 in the refrigerant pipe 2
Is connected to one end of a refrigerant pipe 29, and the other end of the refrigerant pipe 29 is connected to the electromagnetic on-off valve 26 in the refrigerant pipe 23.
It is further connected to the compressor 1 side. In the refrigerant pipe 29,
An electromagnetic on-off valve 30 is interposed.

Here, in FIG. 1, portions surrounded by a two-dot chain line, that is, a compressor 1, an outdoor heat exchanger 4, a blower 3, a first expansion valve 11, an indoor heat exchanger 13, and a blower 1
2. The second expansion valve 16, the heat storage tank 18, the respective refrigerant pipes, and the respective solenoid on-off valves are unitized and configured as a unit A. These devices and the refrigerant pipe are housed in a housing B as schematically shown in FIG. Unit A is installed outdoors, and the conditioned air blown by blower 12 is guided to room E by air supply duct C and returned by return air duct D. Note that, in the figure, F is a filter.

The heat pump system configured as described above is controlled by the control means, and performs various operations as follows. Hereinafter, various operations will be described.

(Ice storage operation) This operation is usually performed at night in summer. As shown in FIG. 3, in this operation, the electromagnetic on-off valve 5, the second expansion valve 16 and the electromagnetic on-off valve 26 are opened, the other electromagnetic on-off valves and expansion valves are closed, and the refrigerant is , The compressor 1, the electromagnetic on-off valve 5, the outdoor heat exchanger 4, the second expansion valve 1,
6, the heat storage tank 18, the electromagnetic switching valve 26, and the compressor 1 are circulated in this order.

In the meantime, the high temperature discharged from the compressor 1
The high-pressure refrigerant gas passes through the outdoor heat exchanger 4. The outdoor heat exchanger 4 functions as a condenser, and the high-temperature and high-pressure refrigerant gas is condensed into a high-pressure refrigerant liquid while passing through the outdoor heat exchanger 4, and then is discharged by the second expansion valve 16. The pressure is reduced to a low pressure two-phase state. Thereafter, the heat storage tank 18 functions as an evaporator, and the refrigerant evaporates while passing through the heat storage tank 18 to be a low-pressure gas, while ice heat is stored in the heat storage tank 18. Thereafter, the refrigerant gas is returned to the suction side of the compressor 1.

In this operation, ice heat is stored using nighttime electric power, so that nighttime electric power can be effectively used.

(Cooling operation) This operation is usually performed in summer. In this operation, a cooling operation that is normally performed is performed. As shown in FIG. 4, in this operation, the electromagnetic on-off valve 5, the electromagnetic on-off valve 10, the first expansion valve 11, and the electromagnetic on-off valve 15 are opened, and the other electromagnetic on-off valves and expansion valves are closed. The refrigerant is supplied to the compressor 1, the electromagnetic on-off valve 5, the outdoor heat exchanger 4, the electromagnetic on-off valve 10, the first expansion valve 11, the indoor heat exchanger 13, and the electromagnetic on-off valve 15, as indicated by solid arrows. And the compressor 1 in this order.

During this time, the high temperature discharged from the compressor 1
The high-pressure refrigerant gas passes through the outdoor heat exchanger 4. The outdoor heat exchanger 4 functions as a condenser, and the high-temperature and high-pressure refrigerant gas is condensed into a high-pressure refrigerant liquid while passing through the outdoor heat exchanger 4, and then the first expansion valve The pressure is reduced by 11 to a low-pressure two-phase state. Then, indoor heat exchanger 1
3 functions as an evaporator, and the refrigerant evaporates while passing through the indoor heat exchanger 13 to be a low-pressure gas. Thereafter, the refrigerant gas is returned to the suction side of the compressor 1.

(Cooling operation using ice heat storage) This operation is usually performed by
It is operated during peak hours during the daytime in summer (usually from 1 pm to 4 pm). As shown in FIG. 5, in this operation, the electromagnetic on-off valve 5, the electromagnetic on-off valve 19, the electromagnetic on-off valve 24,
The first expansion valve 11 and the electromagnetic on-off valve 15 are opened, the other electromagnetic on-off valves and the expansion valves are closed, and the refrigerant flows into the compressor 1, the electromagnetic on-off valve 5 as shown by solid arrows. , Outdoor heat exchanger 4, electromagnetic on-off valve 19, heat storage tank 18,
Solenoid on-off valve 24, first expansion valve 11, indoor heat exchanger 1
3. The electromagnetic valve 15 and the compressor 1 are circulated in this order.

During this time, the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 passes through the outdoor heat exchanger 4 and the heat storage tank 18. The outdoor heat exchanger 4 and the heat storage tank 18 function as a condenser, and the high-temperature and high-pressure refrigerant gas is condensed into a high-pressure refrigerant liquid while passing through them, and then the first expansion valve 11 To reduce the pressure to a low-pressure two-phase state. Thereafter, the indoor heat exchanger 13 functions as an evaporator, and the refrigerant evaporates while passing through the indoor heat exchanger 13 to become low-pressure gas. Thereafter, the refrigerant gas is returned to the suction side of the compressor 1.

In this operation, the refrigerant is condensed by utilizing the ice heat stored in the heat storage tank 18, so that the cooling capacity is improved and the power peak is cut because the ice heat is stored by the nighttime power.

(Hot water storage operation) This operation is usually performed at night in winter. As shown in FIG. 6, in this operation, the electromagnetic on-off valve 28, the electromagnetic on-off valve 25, the second expansion valve 16 and the electromagnetic on-off valve 30 are opened, and the other electromagnetic on-off valves and expansion valves are closed. The refrigerant is supplied to the compressor 1, the solenoid on-off valve 28, and the solenoid on-off valve 2 as shown by solid arrows.
5, heat storage tank 18, second expansion valve 16, outdoor heat exchanger 4,
The solenoid valve 30 and the compressor 1 are circulated in this order.

During this time, the high temperature discharged from the compressor 1
The high-pressure refrigerant gas passes through the heat storage tank 18. This heat storage tank 18 functions as a condenser, and the high-temperature and high-pressure refrigerant gas
While passing through them, the refrigerant is condensed into a high-pressure refrigerant liquid, while hot water heat is stored in the heat storage tank 18. Thereafter, the pressure of the refrigerant is reduced by the second expansion valve 16 to a low-pressure two-phase state. Thereafter, the outdoor heat exchanger 4 functions as an evaporator,
The refrigerant evaporates while passing through the outdoor heat exchanger 4 to become a low-pressure gas, and then returns to the suction side of the compressor 1.

In this operation, since the hot water is stored by using the nighttime electric power, the nighttime electric power can be effectively used. In addition, heat is taken by the outdoor heat exchanger 4 using the outside air as a heat source, and the heat is used to perform hot water heat storage, so that energy saving and cost saving can be achieved.

(Heating operation using outside air as heat source)
It is usually driven during the daytime in winter. In this operation, it operates as a heat pump using outside air as a heat source. As shown in FIG. 7, in this operation, the electromagnetic on-off valve 28, the first expansion valve 11, the electromagnetic on-off valve 10, and the electromagnetic on-off valve 30 are opened, and the other electromagnetic on-off valves and expansion valves are closed. And
As shown by solid arrows, the refrigerant is supplied to the compressor 1, the electromagnetic on-off valve 28, the indoor heat exchanger 13, the first expansion valve 11, the electromagnetic on-off valve 10, the outdoor heat exchanger 4, the electromagnetic on-off valve 30, and the compression valve. Machine 1 is circulated in the order.

During this time, the high temperature discharged from the compressor 1
The high-pressure refrigerant gas passes through the indoor heat exchanger 13. The indoor heat exchanger 13 functions as a condenser, and the high-temperature and high-pressure refrigerant gas is condensed into a high-pressure refrigerant liquid while passing through the indoor heat exchanger 13. Thereafter, the refrigerant is supplied to the first expansion valve 1
The pressure is reduced by 1 to a low pressure two-phase state. Thereafter, the outdoor heat exchanger 4 functions as an evaporator, and the refrigerant evaporates while passing through the outdoor heat exchanger 4 to become a low-pressure gas, and then returns to the suction side of the compressor 1.

(Heating operation using hot water heat storage) This operation is normally performed at the peak of heating in the morning in winter. As shown in FIG. 8, in this operation, the electromagnetic on-off valve 28 and the first expansion valve 1
1. While the solenoid on-off valve 10, the solenoid on-off valve 19 and the solenoid on-off valve 26 are opened, the other solenoid on-off valves and the expansion valves are closed, and the refrigerant, as indicated by solid arrows,
The compressor 1, the electromagnetic on / off valve 28, the indoor heat exchanger 13, the first expansion valve 11, the electromagnetic on / off valve 10, the electromagnetic on / off valve 19, the heat storage tank 18, the electromagnetic on / off valve 26, and the compressor 1 are circulated in this order.

During this time, the high temperature discharged from the compressor 1
The high-pressure refrigerant gas passes through the indoor heat exchanger 13. The indoor heat exchanger 13 functions as a condenser, and the high-temperature and high-pressure refrigerant gas is condensed into a high-pressure refrigerant liquid while passing through the indoor heat exchanger 13. Thereafter, the refrigerant is supplied to the first expansion valve 1
The pressure is reduced by 1 to a low pressure two-phase state. Thereafter, the heat storage tank 18 functions as an evaporator, and the refrigerant evaporates while passing therethrough to be a low-pressure gas, and is then returned to the suction side of the compressor 1.

In this operation, the refrigerant is evaporated by using the hot water stored in the heat storage tank 18 at a temperature higher than the outside air temperature, so that the heating capacity is improved, and since the heat is stored by the nighttime electric power, the heat is stored in the morning. Power peak cut can be achieved.

In such a heat pump system, it is possible to perform an ice heat storage operation, a cooling operation, a cooling operation using ice storage, a hot water storage operation, a heating operation using outside air as a heat source, and a heating operation using hot water storage. Therefore, the nighttime power can be effectively used by utilizing ice heat storage and hot water heat storage, thus making it possible to level the power load at the peak of the air conditioning load and reduce running costs by using cheaper power. Become.

Further, the compressor 1, the outdoor heat exchanger 4, the blower 3, the first expansion valve 11, the indoor heat exchanger 13, and the blower 1
2. Since the second expansion valve 16, the heat storage tank 18, each refrigerant pipe, and each solenoid on-off valve are housed in the housing B and are unitized as a unit A, no refrigerant pipe is provided outside. Therefore, it is possible to prevent the refrigerant from leaking to the outside of the unit A during piping work during installation or repair. Further, since the unit A is unitized, there is an advantage that the unit can be used only by installing the air supply duct C, the return air duct D, and the outlet and the inlet to the room E. In particular, it is suitable for small shops, offices, or houses.

In the above embodiment, the unit A is installed outdoors. However, if units for taking in and exhausting outside air are installed on the indoor heat exchanger 4 side, the unit A can be installed indoors. .

[0035]

As described above, according to the heat pump system of the first aspect, the ice heat storage operation, the cooling operation, the cooling operation using the ice storage, the hot water storage operation, the heating operation using the outside air as a heat source, and the hot water storage operation. Since the heating operation can be performed, nighttime electric power can be effectively used by using ice heat storage and hot water heat storage, so that the power load can be leveled during peak air conditioning loads and running can be saved by using cheaper power. This has the effect of reducing costs.

According to the heat pump system of the second aspect, the compressor, the outdoor heat exchanger, the pressure reducing mechanism, the indoor heat exchanger, the second pressure reducing mechanism and the heat storage tank are unitized and integrated. The refrigerant pipe that circulates the refrigerant between the units can be housed in the unit, and there is no need to provide any refrigerant pipes outside.Therefore, during installation or repair work, the refrigerant is Can be prevented from leaking outside. Furthermore, since the unit is formed, if the duct, the outlet to the room, and the inlet are installed, there is an advantage that the unit can be used. In particular, it is suitable for small shops, offices, or houses.

[Brief description of the drawings]

FIG. 1 is a refrigerant circuit diagram showing one embodiment of a heat pump system of the present invention.

FIG. 2 is a schematic perspective view showing a unit according to the present invention.

FIG. 3 is a diagram showing one embodiment of the heat pump system of the present invention, and is a refrigerant circuit diagram during ice heat storage operation.

FIG. 4 is a diagram showing one embodiment of the heat pump system of the present invention, and is a refrigerant circuit diagram during a cooling operation.

FIG. 5 is a diagram showing an embodiment of the heat pump system of the present invention, and is a refrigerant circuit diagram during cooling operation using ice storage.

FIG. 6 is a diagram showing one embodiment of the heat pump system of the present invention, and is a refrigerant circuit diagram during a hot water heat storage operation.

FIG. 7 is a diagram showing an embodiment of the heat pump system of the present invention, and is a refrigerant circuit diagram during a heating operation using outside air as a heat source.

FIG. 8 is a diagram showing an embodiment of the heat pump system of the present invention, and is a refrigerant circuit diagram during a heating operation utilizing hot water storage.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 4 Outdoor heat exchanger 11 1st expansion valve (1st pressure reduction mechanism) 13 Indoor heat exchanger 16 2nd expansion valve (2nd pressure reduction mechanism) 22 Heat storage tank

Continuing on the front page (72) Inventor Hikaru Kobayashi Taisei Construction Co., Ltd., 1-25-1 Nishi Shinjuku, Shinjuku-ku, Tokyo (72) Inventor Hiroshi Kitagawa 3150 Iiyama, Atsugi-shi, Kanagawa Prefecture Pmac Japan Co., Ltd. (72) Invention Person Hitoshi Hirai 3150 Iiyama, Atsugi-shi, Kanagawa Prefecture F-term (reference) 3L092 TA12 TA16 TA20 UA02 UA04 UA34 VA02 VA07 WA05 WA12

Claims (2)

[Claims] 1. A compressor, an outdoor heat exchanger, a first decompression mechanism, and an indoor heat exchanger are connected in a ring shape in this order, and a second decompression mechanism, a heat storage tank for both ice storage and hot water storage. The refrigerant is circulated between them, and during the ice heat storage operation, the refrigerant is supplied to the compressor, the outdoor heat exchanger, the second pressure reducing mechanism, the heat storage tank, and the In the cooling operation, the refrigerant circulates in the order of the compressor, the outdoor heat exchanger, the first pressure reducing mechanism, the indoor heat exchanger, and the compressor, and performs cooling using the ice heat storage. During operation, the refrigerant circulates in the order of the compressor, the outdoor heat exchanger, the heat storage tank, the first pressure reducing mechanism, the indoor heat exchanger, and the compressor. Are the compressor, the heat storage tank, the second pressure reducing mechanism, The refrigerant is circulated in the order of the outdoor heat exchanger and the compressor, and during the heating operation using outside air as a heat source, the refrigerant flows through the compressor, the indoor heat exchanger, the first pressure reducing mechanism, the outdoor heat exchanger, and the In the heating operation using hot water heat storage, the refrigerant is circulated in the order of the compressor, the indoor heat exchanger, the first pressure reducing mechanism, the heat storage tank, and the compressor. And heat pump system. 2. The apparatus according to claim 1, wherein the compressor, the outdoor heat exchanger, the first pressure reducing mechanism, the indoor heat exchanger, the second pressure reducing mechanism, and the heat storage tank are unitized. The heat pump system according to claim 1.