KR102491228B1 - Air Conditioning system - Google Patents

Abstract

An air conditioning system according to an embodiment of the present invention includes a compressor connected to a suction pipe and a discharge pipe; an outdoor heat exchanger selectively communicating with a suction pipe or a discharge pipe by a first quadrilateral; a liquid pipe connecting the outdoor heat exchanger with at least one indoor heat exchanger; a low-pressure engine that communicates the indoor heat exchanger with the suction pipe; a high-pressure engine selectively communicating the indoor heat exchanger with a suction pipe or a discharge pipe by means of a second quadrilateral; A connecting liquid pipe connecting the liquid pipe and the heat storage heat exchanger; A first connection engine that communicates the heat storage heat exchanger and the low pressure engine; And it may include a second connection engine that communicates the heat storage heat exchanger and the high-pressure engine.

Description

Air conditioning system

The present invention relates to an air conditioning system, and more particularly, to an air conditioning system capable of both heating and cooling.

An air conditioning system, generally referred to as an air conditioner, cools the room by a repetitive action of sucking in hot air in the room, exchanging heat with a low-temperature refrigerant, and then discharging it to the room, or cooling the room by the opposite action. /Heating system. The air conditioning system consists of a compressor-condenser-expander-evaporator to form a series of cycles.

Prior document KR 10-2016-0042384 A (published on April 19, 2016) discloses a heat pump system capable of operating heat storage alone, heating alone, and heat storage heating simultaneously by varying flow paths of refrigerant and water. However, the heat pump system disclosed in the prior literature has a problem in that it is applicable only to the heating season in winter because it cannot perform a cooling operation or a storage cooling operation.

KR 10-2016-0042384 A (published on 2016.04.19)

An object to be solved by the present invention is to provide an air conditioning system capable of both cooling storage during cooling operation and heat storage during heating operation.

An air conditioning system according to an embodiment of the present invention includes a compressor connected to a suction pipe and a discharge pipe; an outdoor heat exchanger selectively communicating with the suction pipe or the discharge pipe through a first quadrilateral; a liquid pipe connecting the outdoor heat exchanger to at least one indoor heat exchanger; a low-pressure engine communicating the indoor heat exchanger with the suction pipe; a high-pressure engine selectively communicating the indoor heat exchanger with the suction pipe or the discharge pipe by means of a second quadrilateral; a connecting liquid pipe connecting the liquid pipe and the heat storage heat exchanger; a first connection engine that communicates the heat storage heat exchanger and the low pressure engine; and a second connection engine that communicates the heat storage heat exchanger and the high-pressure engine.

a thermal storage expansion mechanism installed in the connecting liquid pipe; and a controller controlling an opening degree of the thermal storage expansion mechanism.

The controller expands the thermal storage expansion device in a preset expansion mode in a cooling/cooling operation mode in which the refrigerant is evaporated in the indoor heat exchanger and in the thermal storage heat exchanger or in a heating operation mode using thermal storage in which the refrigerant is evaporated in the outdoor heat exchanger and the thermal storage heat exchanger. You can control the degree of opening.

The controller may fully open the thermal storage expansion mechanism in a cooling operation mode for storage use in which the refrigerant is condensed in the outdoor heat exchanger and the storage heat exchanger or in a storage heating operation mode in which the refrigerant is condensed in the indoor heat exchanger and the storage heat exchanger. can

a connection organ opening/closing mechanism that opens and closes the first connection organ and the second connection organ, respectively; and a controller controlling the opening/closing mechanism of the connecting organ so that one of the first connecting organ and the second connecting organ is opened and the other is closed in a cooling/heating operation mode.

an engine opening/closing mechanism for opening and closing the low pressure engine and the high pressure engine, respectively; and a controller controlling the engine opening/closing mechanism so that one of the high-pressure engine and the low-pressure engine is opened and the other is closed in a cooling/heating operation mode.

a low pressure opening/closing valve installed between a point where the first connection engine is connected among the low pressure engines and the indoor heat exchanger; and a high-pressure opening/closing valve installed between a point where the second connection engine is connected among the high-pressure engines and the indoor heat exchanger.

a first on/off valve installed in the first connection organ; And it may further include a second on-off valve installed in the second connection organ.

In the storage cooling operation mode in which the refrigerant evaporates in the indoor heat exchanger and the storage heat exchanger or in the heat storage heating operation mode in which the refrigerant evaporates in the outdoor heat exchanger and the storage heat exchanger, the low pressure on-off valve and the first on-off valve are opened, A controller closing the high-pressure on-off valve and the second on-off valve may be further included.

In an air conditioning system according to an embodiment of the present invention, a compressor connected to a suction pipe and a discharge pipe, and an outdoor heat exchanger selectively communicate with the suction pipe or the discharge pipe, and a first four-way side connected to the discharge pipe and the suction pipe. An outdoor unit including an outdoor heat exchanger including a side; at least one indoor unit including an indoor heat exchanger; A heat storage tank including a heat storage heat exchanger; a liquid pipe connecting the outdoor heat exchanger to the indoor heat exchanger; a low-pressure engine communicating the indoor heat exchanger with the suction pipe; a high-pressure engine connecting the second quadrilateral and the indoor heat exchanger; a connecting liquid pipe connecting the liquid pipe and the thermal storage heat exchanger; a first connection engine that communicates the heat storage heat exchanger and the low pressure engine; a second connection engine that communicates the heat storage heat exchanger and the high-pressure engine; and a heat storage distributor in which a connection part between the liquid pipe and the liquid pipe, a connection part between the first connection engine and the low pressure engine, and a connection part between the second connection engine and the high pressure engine are disposed.

The heat storage distributor may include a first on/off valve installed in the first connection organ; a second on/off valve installed in the second connection organ; a low pressure opening/closing valve installed in the low pressure engine; a high-pressure on-off valve installed in the high-pressure engine; And it may include a thermal storage expansion mechanism installed in the connection liquid pipe.

In the storage cooling operation mode in which the refrigerant is evaporated in the indoor heat exchanger and the storage heat exchanger or in the heat storage heating operation mode in which the refrigerant is evaporated in the outdoor heat exchanger and the storage heat exchanger, the thermal storage expansion mechanism is controlled at a preset expansion opening degree It may contain more controllers.

A controller for fully opening the thermal storage expansion mechanism in a cooling operation mode for storage use in which the refrigerant is condensed in the outdoor heat exchanger and the storage heat exchanger or in a storage heating operation mode in which the refrigerant is condensed in the indoor heat exchanger and the storage heat exchanger is included. can do.

In the storage cooling operation mode in which the refrigerant evaporates in the indoor heat exchanger and the storage heat exchanger or in the heat storage heating operation mode in which the refrigerant evaporates in the outdoor heat exchanger and the storage heat exchanger, the low pressure on-off valve and the first on-off valve are opened, A controller closing the high-pressure on-off valve and the second on-off valve may be further included.

In the case of the storage cooling operation mode in which the refrigerant is condensed in the outdoor heat exchanger and the storage heat exchanger or in the storage heating operation mode in which the refrigerant is condensed in the indoor heat exchanger and the storage heat exchanger, the low pressure on-off valve and the first on-off valve are closed. A controller for opening the high-pressure on-off valve and the second on-off valve may be further included.

According to a preferred embodiment of the present invention, there is an advantage in that energy costs can be reduced through heat storage or cooling storage using late-night electricity.

In addition, when a peak load occurs in the indoor unit, heat storage or cooling energy is used to assist the outdoor heat exchanger, thereby temporarily improving heating and cooling capacity and improving cooling efficiency of the air conditioning system.

In addition, cooling or heat storage is performed when only a part of a plurality of indoor units is operated (partial load operation) or when the indoor temperature reaches the set temperature and the operation of the indoor unit is stopped (Thermo-off). Therefore, the operating frequency of the compressor is prevented from deviating from the optimal operating range, and the cooling load is maintained at an appropriate level, thereby improving the efficiency of the air conditioning system.

1 is a configuration diagram of an air conditioning system according to an embodiment of the present invention.
2 is a control block diagram of an air conditioning system according to an embodiment of the present invention.
3 is a diagram illustrating a flow direction of refrigerant in a storage cooling/cooling operation mode.
4 is a diagram illustrating a flow direction of a refrigerant in a cooling operation mode for storage cooling.
5 is a diagram illustrating a flow direction of a refrigerant in a heat storage heating operation mode.
6 is a diagram illustrating a flow direction of a refrigerant in a heating operation mode using heat storage.

Hereinafter, specific embodiments of the present invention will be described in detail with drawings.

1 is a configuration diagram of an air conditioning system according to an embodiment of the present invention, and FIG. 2 is a control block diagram of the air conditioning system according to an embodiment of the present invention.

An air conditioning system according to an embodiment of the present invention includes an outdoor unit 10, at least one indoor unit 20, and the outdoor unit 10 and the indoor unit 20 between the outdoor unit 10 and the indoor unit 20, respectively. It may include a connected heat storage distributor 40 and a heat storage tank 30 connected to the heat storage distributor 40 . The air conditioning system according to an embodiment of the present invention may further include a liquid pipe 50, an engine 60, 70, and 80, a connecting liquid pipe 51, and a connecting engine 61, 71, and 81. there is.

The outdoor unit 10 may include a compressor 11, an outdoor heat exchanger 16, a first four-sided side 15, a second four-sided side 18, and an outdoor expansion device 17. Each indoor unit 20 may include an indoor heat exchanger 21 and an indoor expansion device 22 . The heat storage tank 30 may include a heat storage heat exchanger 31 . The heat storage distributor 40 may include a heat storage expansion mechanism 52 , engine opening/closing mechanisms 72 and 82 , and connecting engine opening/closing mechanisms 73 and 83 .

The compressor 11 may be an inverter compressor whose operating frequency is controlled. A suction pipe 13 and a discharge pipe 12 may be connected to the compressor 11 . The refrigerant sucked into the compressor 11 through the suction pipe 13 may be compressed in the compressor 11 and discharged through the discharge pipe 12 .

An accumulator 14 separating gaseous refrigerant and liquid refrigerant may be installed in the suction pipe 13 , and gaseous refrigerant may be sucked into the compressor 11 .

The outdoor heat exchanger 16 may condense or evaporate the refrigerant by exchanging heat with air blown by an outdoor fan (not shown). The outdoor fan may be included in the outdoor unit 10 .

In more detail, the refrigerant may be condensed in the outdoor heat exchanger 16 in the cooling operation mode, and the refrigerant may be evaporated in the outdoor heat exchanger 16 in the heating operation mode.

A liquid pipe 50 may be connected to the outdoor heat exchanger 16 . In more detail, one side of the outdoor heat exchanger 16 may be in communication with the first four sides 15 and the other side may be connected to the liquid pipe 50 for the flow path of the refrigerant.

The first four sides 15 may selectively communicate the outdoor heat exchanger 16 with the suction pipe 13 or the discharge pipe 12 .

More specifically, the first four sides 15 can be controlled so that the discharge pipe 12 and the outdoor heat exchanger 16 communicate with each other in the cooling operation mode, and exchange heat with the suction pipe 13 in the heating operation mode. The group 16 can be controlled to communicate.

The liquid pipe 50 may connect the outdoor heat exchanger 16 and the indoor heat exchanger 21 . A refrigerant in a liquid state or a two-phase refrigerant in which a liquid state and a gaseous state coexist may flow through the liquid pipe 50 .

The liquid pipe 50 may pass through the heat storage distributor 40 . That is, a part of the liquid pipe 50 may be located inside the heat storage distributor 40 . Therefore, the liquid pipe 50 can connect the outdoor unit 10 and the heat storage distributor 40 and connect the heat storage distributor 40 and the indoor unit 20 .

When there are a plurality of indoor heat exchangers 21, the liquid pipe 50 is connected to the outdoor heat exchanger 16 and is branched from a common liquid pipe in which the outdoor expansion device 17 is installed, and each indoor heat exchanger 21 It is connected to and may include a plurality of branch liquid pipes in which the indoor expansion mechanism 22 is installed.

The outdoor expansion device 17 may be installed in the liquid pipe 50. The outdoor expansion device 17 may be installed adjacent to the outdoor heat exchanger 17 along the liquid pipe 50 .

The outdoor expansion device 17 may include an Electronic Expansion Valve (EEV) whose opening is electronically controlled.

In the cooling operation mode, the outdoor expansion device 17 can be controlled with a preset expansion opening degree, and in the heating operation mode, the outdoor expansion device 17 can be fully opened.

When the opening of the outdoor expansion device 17 is controlled to a preset expansion opening degree, the refrigerant passing through the outdoor expansion device 17 can be throttled and reduced in pressure. On the other hand, when the outdoor expansion device 17 is fully opened and the opening degree is maximally opened, the refrigerant passing through the outdoor expansion device 17 can pass through the outdoor expansion device 17 without being throttled.

The indoor heat exchanger 21 may condense or evaporate the refrigerant by exchanging heat with air blown by an indoor fan (not shown). The indoor fan (not shown) may be provided in each indoor unit 20 .

In more detail, the refrigerant may be evaporated in the indoor heat exchanger 21 in the cooling operation mode, and the refrigerant may be condensed in the indoor heat exchanger 21 in the heating operation mode.

The indoor expansion device 22 may be installed in the liquid pipe 50 . The indoor expansion device 22 may be installed adjacent to the indoor heat exchanger 21 along the liquid pipe 50 .

The indoor expansion device 22 may include an Electronic Expansion Valve (EEV) whose opening is electronically controlled.

In the cooling operation mode, the indoor expansion device 22 may be fully opened, and in the heating operation mode, the indoor expansion device 22 may be controlled with a preset expansion opening degree.

When the opening of the indoor expansion mechanism 22 is controlled to a preset expansion opening, the refrigerant passing through the indoor expansion mechanism 22 can be throttled and reduced in pressure. On the other hand, when the indoor expansion mechanism 22 is fully opened and the opening degree is maximally opened, the refrigerant passing through the indoor expansion mechanism 22 can pass through the indoor expansion mechanism 22 without being throttled.

The engines 60, 70, and 80 may include a main engine 60 connected to the indoor heat exchanger 21, and a low pressure engine 70 and a high pressure engine 80 branched from the main engine 60. .

The indoor heat exchanger 21 may communicate with the low pressure engine 70 and the high pressure engine 80 . In more detail, the indoor heat exchanger 21 may be connected to the main engine 60, and the low pressure engine 70 and the high pressure engine 80 may be branched from the main engine 60.

Regarding the flow path of the refrigerant, one side of the indoor heat exchanger 21 may be connected to the liquid pipe 50 and the other side may be connected to the main engine 60.

When there are a plurality of indoor heat exchangers 21, the main engine 60 is a common engine connected to the low pressure engine 70 and the high pressure engine 80, and a branch branched from the common engine and connected to each indoor heat exchanger 21 organs may be included.

A relatively low-pressure gaseous refrigerant may flow through the low-pressure engine 70 , and a relatively high-pressure gaseous refrigerant may flow through the high-pressure engine 80 .

The low pressure engine 70 may communicate the indoor heat exchanger 21 and the suction pipe 13. In more detail, one side of the low pressure engine 70 may be connected to the main engine 60 and the other side may be connected to the suction pipe 13 .

The high-pressure engine 80 may selectively communicate the indoor heat exchanger 21 with the suction pipe 13 or the discharge pipe 12 through the second quadrilateral side 18 .

A point 60A at which the main engine 60 branches into the low pressure engine 70 and the high pressure engine 80 may be located in the heat storage distributor 40 . Accordingly, the main engine 60 may connect the heat storage distributor 40 and the indoor unit 20 . In addition, the low pressure engine 70 and the high pressure engine 80 may connect the heat storage distributor 40 and the outdoor unit 10 .

Meanwhile, the heat storage heat exchanger 31 may heat-exchange the refrigerant passing through the heat storage heat exchanger 31 with a heat storage material (not shown). The heat storage material may surround the heat storage heat exchanger 31 or may be provided to contact the heat storage heat exchanger 31 . The heat storage material may include a phase change material (PCM) to have sufficient heat storage capacity.

By heat exchange with the refrigerant passing through the heat storage heat exchanger 31, cold air may be stored in the heat storage material or heat may be stored. During cooling, the refrigerant may be evaporated in the thermal storage heat exchanger 31, and during thermal storage, the refrigerant may be condensed in the thermal storage heat exchanger 31.

The connection liquid pipe 51 may connect the heat storage heat exchanger 31 and the liquid pipe 50 .

The connection portion 51A of the connection liquid pipe 51 and the liquid pipe 50 may be located inside the heat storage distributor 40 . Accordingly, the connection liquid pipe 51 may connect the heat storage distributor 40 and the heat storage tank 30 .

The thermal storage expansion mechanism 52 may be installed in the connection liquid pipe 51 . The heat storage expansion mechanism 52 is preferably included in the heat storage distributor 40, but a configuration included in the heat storage tank 30 instead of the heat storage distributor 40 is also possible.

The thermal storage expansion mechanism 52 may include an electronic expansion valve (EEV) whose opening is electronically controlled.

When the opening degree of the thermal storage expansion mechanism 52 is controlled by a predetermined expansion opening degree, the refrigerant passing through the thermal storage expansion mechanism 52 can be throttled and reduced in pressure. On the other hand, when the thermal storage expansion mechanism 52 is fully opened and the opening degree is maximally opened, the refrigerant passing through the thermal storage expansion mechanism 52 may pass through the thermal storage expansion mechanism 52 without being throttled.

The connecting organs 61, 71, and 81 include a main connecting organ 61 connected to the heat storage heat exchanger 31, a first connecting organ 71 branched from the main connecting organ 61, and a second connecting organ ( 82) may be included. The first connection organ 71 may be connected to the low pressure engine 70 and the second connection organ 81 may be connected to the high pressure engine 80 .

The heat storage heat exchanger 31 may communicate with the first connection engine 71 and the second connection engine 81 . In more detail, the heat storage heat exchanger 31 may be connected to the main connecting organ 61, and the first connecting organ 71 and the second connecting organ 81 may be branched from the main connecting organ 61.

Regarding the flow path of the refrigerant, one side of the heat storage heat exchanger 31 may be connected to the connecting liquid pipe 51 and the other side may be connected to the main connecting organ 61.

The first connection engine 71 may communicate the thermal storage heat exchanger 31 and the low pressure engine 70 . In more detail, one side of the first connection organ 71 may be connected to the main connection organ 61 and the other side may be connected to the low pressure engine 70 .

The second connection engine 81 may communicate the thermal storage heat exchanger 31 and the high-pressure engine 80 . In more detail, one side of the second connection organ 81 may be connected to the main connection organ 61 and the other side may be connected to the high pressure engine 80 .

A point 61A at which the main connection organ 61 is branched into the first connection organ 71 and the second connection organ 81 may be located in the heat storage distributor 40 . In addition, the connection part 71A between the first connection engine 71 and the low pressure engine 70 and the connection part 81A between the second connection engine 81 and the high pressure engine 80 may be located inside the heat storage distributor 40. can Therefore, the main connection organ 61 may connect the heat storage distributor 40 and the heat storage tank 30 .

Meanwhile, the engine opening/closing mechanisms 72 and 82 may open and close the low pressure engine 70 and the high pressure engine 80, respectively. In the cooling/heating operation mode, the engine opening/closing mechanisms 72 and 82 may be controlled such that one of the high pressure engine 80 and the low pressure engine 70 is open and the other is closed.

In more detail, in the cooling operation mode, the engine opening/closing mechanisms 72 and 82 may be controlled so that the high pressure engine 80 is closed and the low pressure engine 70 is opened. On the other hand, in the heating operation mode, the engine opening/closing mechanisms 72 and 82 may be controlled so that the low pressure engine 70 is closed and the high pressure engine 80 is opened.

The engine opening/closing mechanisms 72 and 82 may include a low pressure opening/closing valve 72 installed in the low pressure engine 70 and a high pressure opening/closing valve 82 installed in the high pressure engine 80 . However, the configuration of the engine opening/closing mechanism is not limited thereto, and a configuration including a three-way valve installed at a point (60A) where the main engine 60 is branched into the low pressure engine 70 and the high pressure engine 80 is also possible. to be.

Each of the low pressure on/off valve 72 and the high pressure on/off valve 82 may include a solenoid valve.

The low pressure opening/closing valve 72 may be installed between the connection portion 71A of the first connection engine 71 and the low pressure engine 70 and the main engine 60 . In addition, the low-pressure on-off valve 72 may be installed between the main engine 60 and the connection portion 81A of the second connection engine 81 and the high-pressure engine 80 .

In the cooling/heating operation mode, one of the low pressure on/off valve 72 and the high pressure on/off valve 82 may be open and the other may be closed. In more detail, in the cooling operation mode, the low pressure valve 72 may be opened and the high pressure valve 82 may be closed. Conversely, in the heating operation mode, the low pressure valve 72 may be closed and the high pressure valve 82 may be open.

Meanwhile, the connecting organ opening/closing mechanisms 73 and 83 may open and close the first connecting organ 71 and the second connecting organ 81, respectively. In the cooling/heating operation mode, the connecting engine opening/closing mechanisms 73 and 83 may be controlled such that one of the high pressure engine 80 and the low pressure engine 70 is opened and the other is closed.

The connecting organ opening/closing mechanism 73 (83) may include a first on/off valve 73 installed in the first connecting organ 71 and a second on/off valve 83 installed in the second connecting organ 81. However, the configuration of the connecting organ opening/closing mechanism is not limited thereto, and includes a three-way valve installed at a point 61A where the main connecting organ 61 is branched into the first connecting organ 71 and the second connecting organ 81. Of course, it is also possible to configure

Each of the first open/close valve 73 and the second open/close valve 83 may include a solenoid valve.

In the cooling/heating operation mode, one of the first on/off valve 73 and the second on/off valve 83 may be open and the other may be closed.

The air conditioning system according to the present embodiment may further include a controller 90 that controls overall operations of the air conditioning system.

The controller 90 may be disposed in at least one of the outdoor unit 10, the indoor unit 20, the heat storage tank 30, and the heat storage distributor. In addition, a configuration in which the management system of the building in which the air conditioning system is installed includes the controller 90 is also possible.

The controller 90 can turn on/off the compressor 11 and adjust the operating frequency of the compressor 11 .

The controller 90 may control the first four sides 15 to communicate the outdoor heat exchanger 16 with the discharge pipe 12 or the suction pipe 13 . In addition, the controller 90 may control the second quadrilateral 18 to communicate the high-pressure engine 80 with the discharge pipe 12 and the suction pipe 13 .

The controller 90 may adjust the opening degree of each of the outdoor expansion device 17 , the indoor expansion device 22 , and the thermal storage expansion device 52 . In addition, the controller 90 may open/close each of the low pressure on/off valve 72, the high pressure on/off valve 72, the first on/off valve 73 and the second on/off valve 83.

In addition, the controller 90 may control the air conditioning system in a cooling operation mode or a heating operation mode. The cooling operation mode may include a storage cooling operation mode and a cooling operation mode using storage cooling, and the heating operation mode may include a heat storage heating operation mode and a heating operation mode using heat storage.

Each operation mode will be described in detail below.

3 is a diagram illustrating a flow direction of refrigerant in a storage cooling/cooling operation mode.

The controller 90 may control the air conditioning system in a cooling/cooling operation mode. The storage cooling/cooling operation mode may be a mode in which cooling is performed in the indoor unit 20 and cold air is stored in the heat storage tank 30 at the same time.

The storage cooling/cooling operation mode can be performed during late night hours when the required cooling load of the indoor unit 20 is low. This may reduce energy costs.

In addition, the storage cooling/cooling operation mode is selected when only some of the plurality of indoor units 20 are operated (partial load operation) or when the indoor unit 20 stops operating due to the indoor temperature reaching a set temperature (Thermo-off). can be performed As a result, a phenomenon in which the operating frequency of the compressor 10 deviates from the optimal operating range due to a small cooling load request is prevented, and the cooling load is maintained at an appropriate level by storage cooling, so that the efficiency of the air conditioning system can be improved.

In the cooling/cooling operation mode, the control module 90 can fully open the outdoor expansion device 17 and control the indoor expansion device 22 and the thermal storage expansion device 52 to a predetermined expansion/opening degree. However, when there are a plurality of indoor units 20 and only some of them are operated, the controller 90 controls the indoor expansion mechanism 22 of the indoor unit 20 in operation at a preset expansion and opening degree, and the indoor unit 20 in operation is stopped. The indoor expansion mechanism 22 may be fully closed.

Also, in the cooling/cooling operation mode, the controller 90 may open the low pressure on-off valve 72 and the first on-off valve 73 and close the high-pressure on-off valve 82 and the second on-off valve 83.

Also, in the cooling/cooling operation mode, the controller 90 may control the first four sides 15 so that the outdoor heat exchanger 16 communicates with the discharge pipe 12 .

Hereinafter, the flow of refrigerant in the storage cooling/cooling operation mode will be described.

The refrigerant compressed in the compressor 11 and discharged through the discharge pipe 12 passes through the first four sides 15, flows into the outdoor heat exchanger 16, and can be condensed in the outdoor heat exchanger 16.

The refrigerant condensed in the outdoor heat exchanger 16 may flow into the liquid pipe 50 . Some of the refrigerant flowing through the liquid pipe 50 may flow into the connection liquid pipe 51 connected to the liquid pipe 50, and the other part may flow into the indoor unit 20 through the liquid pipe 50.

The refrigerant flowing into the indoor unit 20 through the liquid pipe 50 may pass through the indoor expansion mechanism 22 and be throttled. The refrigerant throttled in the indoor expansion device 22 flows into the indoor heat exchanger 21 and is evaporated in the indoor heat exchanger 21 to perform cooling. The refrigerant evaporated in the indoor heat exchanger 21 may flow to the main engine 60 . Since the high pressure valve 82 is closed and the low pressure valve 72 is open, the refrigerant of the main engine 60 can flow to the low pressure engine 70 .

Meanwhile, the refrigerant flowing from the liquid pipe 50 to the connection liquid pipe 51 may pass through the heat storage expansion mechanism 52 and be throttled. The refrigerant throttled in the thermal storage expansion mechanism 52 flows into the thermal storage heat exchanger 31, evaporates in the thermal storage heat exchanger 31, and cools the thermal storage material. The refrigerant evaporated in the heat storage heat exchanger 31 may flow to the main connection organ 61 . Since the second on/off valve 83 is closed and the first on/off valve 73 is open, the refrigerant of the main connecting organ 61 passes through the first connecting organ 71 and flows to the low pressure engine 70. can

The refrigerant evaporated in the indoor heat exchanger 21 and the refrigerant evaporated in the heat storage heat exchanger 30 may be combined in the low pressure engine 70 and flow along the low pressure engine 70 to the suction pipe 13 of the outdoor unit 10. It can be. The refrigerant flowing through the suction pipe 13 may pass through the accumulator 14 and be sucked into the compressor 11 .

The compressor 11 may compress the sucked refrigerant and discharge it back to the discharge pipe 12, and the refrigerant may circulate along the path described above.

4 is a diagram illustrating a flow direction of a refrigerant in a cooling operation mode for storage cooling.

The controller 90 may control the air conditioning system in a cooling operation mode for storage cooling. The cooling operation mode for cooling storage may be a mode in which cold air stored in the heat storage tank 30 is used to reduce the cooling load of the outdoor unit 10 .

The cooling operation mode for cooling storage may be performed when a peak load occurs in the indoor unit 20 . As a result, the heat storage tank 30 serves as a condenser to assist the outdoor heat exchanger 10, thereby improving temporary cooling capacity and cooling efficiency of the air conditioning system.

In the cooling operation mode for storage use, the control module 90 may fully open the outdoor expansion device 17 and the thermal storage expansion device 52 and control the indoor expansion device 22 to a preset expansion and opening degree. However, when there are a plurality of indoor units 20 and only some of them are operated, the controller 90 controls the indoor expansion mechanism 22 of the indoor unit 20 in operation at a preset expansion and opening degree, and the indoor unit 20 in operation is stopped. The indoor expansion mechanism 22 may be fully closed.

In addition, in the cooling operation mode for storage cooling, the controller 90 may open the low pressure on-off valve 72 and the second on-off valve 83 and close the high-pressure on-off valve 82 and the first on-off valve 73.

In addition, in the cooling operation mode for storage cooling, the controller 90 controls the first four sides 15 so that the outdoor heat exchanger 16 communicates with the discharge pipe 12, and the high-pressure engine 80 connects to the discharge pipe 12. It is possible to control the second quadrilateral 18 so as to be in communication with.

Hereinafter, the flow of the refrigerant in the cooling operation mode for storage cooling will be described.

Some of the refrigerant compressed in the compressor 11 and discharged to the discharge pipe 12 may pass through the first four sides 15 and flow to the outdoor heat exchanger 16, while the other portion may pass through the second four sides 18 ) and can flow to the high-pressure engine 80.

The refrigerant flowing into the outdoor heat exchanger 16 may be condensed in the outdoor heat exchanger 16 . The refrigerant condensed in the outdoor heat exchanger 16 may flow into the liquid pipe 50 .

Meanwhile, since the high pressure on/off valve 82 is closed and the second on/off valve 83 is open, the refrigerant flowing into the high pressure engine 80 may flow into the second connection engine 81 . The refrigerant flowing through the second connecting organ 81 may pass through the main connecting organ 61 and flow into the heat storage heat exchanger 31 . The refrigerant flowing into the thermal storage heat exchanger 31 may be condensed by cold air accumulated in the thermal storage material in the thermal storage heat exchanger 31 . The refrigerant condensed in the heat storage heat exchanger 31 may flow to the liquid pipe 50 through the connection liquid pipe 51 .

The refrigerant condensed in the outdoor heat exchanger 16 and the refrigerant condensed in the heat storage heat exchanger 31 may be combined in the liquid pipe 50 and may flow to the indoor unit 20 along the liquid pipe 50 .

The refrigerant flowing into the indoor unit 20 may pass through the indoor expansion mechanism 22 and be throttled. The refrigerant throttled in the indoor expansion device 22 flows into the indoor heat exchanger 21 and is evaporated in the indoor heat exchanger 21 to perform cooling. The refrigerant evaporated in the indoor heat exchanger 21 may flow to the main engine 60 . Since the high pressure valve 82 is closed and the low pressure valve 72 is open, the refrigerant of the main engine 60 can flow to the low pressure engine 70 .

Since the first on/off valve 73 is in a closed state, the refrigerant flowing to the low pressure engine 70 does not flow to the first connecting pipe 71 and passes along the low pressure engine 70 to the suction pipe 13 of the outdoor unit 10. can flow into The refrigerant flowing through the suction pipe 13 may pass through the accumulator 14 and be sucked into the compressor 11 .

The compressor 11 may compress the sucked refrigerant and discharge it back to the discharge pipe 12, and the refrigerant may circulate along the path described above.

5 is a diagram illustrating a flow direction of a refrigerant in a heat storage heating operation mode.

The controller 90 may control the air conditioning system in a heat storage cooling operation mode. The heat storage cooling operation mode may be a mode in which heat is stored in the heat storage tank 30 while heating is performed in the indoor unit 20 .

The heat storage heating operation mode may be performed during late night hours when the required heating load of the indoor unit 20 is low. This may reduce energy costs.

In addition, the heat storage heating operation mode is selected when only some of the plurality of indoor units 20 are operated (partial load operation) or when the indoor unit 20 stops operating as the indoor temperature reaches a set temperature (Thermo-off). can be performed As a result, a phenomenon in which the operating frequency of the compressor 10 deviates from the optimal operating range due to a small heating load request is prevented, and the heating load is maintained at an appropriate level by heat storage, so that the efficiency of the air conditioning system can be improved.

In the heat storage heating operation mode, the control module 90 may fully open the indoor expansion device 22 and the heat storage expansion device 52 and control the outdoor expansion device 17 to a preset expansion and opening degree. However, when there are a plurality of indoor units 20 and only some of them are operated, the controller 90 fully opens the indoor expansion mechanism 22 of the indoor unit 20 in operation and the indoor expansion mechanism of the indoor unit 20 in operation is suspended. (22) can be fully closed.

In addition, in the heat storage heating operation mode, the controller 90 may close the low pressure on-off valve 72 and the first on-off valve 73 and open the high-pressure on-off valve 82 and the second on-off valve 83.

In addition, in the thermal storage heating operation mode, the controller 90 controls the first four sides 15 so that the outdoor heat exchanger 16 communicates with the suction pipe 13, and the high-pressure engine 80 communicates with the discharge pipe 12. It is possible to control the second quadrilateral 18 as much as possible.

Hereinafter, the flow of refrigerant in the thermal storage heating operation mode will be described.

The refrigerant compressed in the compressor 11 and discharged through the discharge pipe 12 may pass through the second four sides 18 and flow into the high-pressure engine 80 . Since both the high pressure on-off valve 82 and the second on-off valve 83 are open, some of the refrigerant flowing to the high-pressure engine 80 flows to the second connection engine 81 and the other part flows to the high-pressure engine 80 ) to the main organ 60.

Since the low pressure on/off valve 72 is closed, the refrigerant flowing into the main engine 60 can flow into the indoor heat exchanger 21 of the indoor unit 20 . The refrigerant flowing into the indoor heat exchanger 21 is condensed in the indoor heat exchanger 21 and can perform heating. The refrigerant condensed in the indoor heat exchanger 21 may flow into the liquid pipe 50 .

Meanwhile, the refrigerant flowing through the second connecting organ 81 may pass through the main connecting organ 61 and flow into the heat storage heat exchanger 31 . The refrigerant flowing into the heat storage heat exchanger 31 is condensed and heat can be stored in the heat storage material. The refrigerant condensed in the heat storage heat exchanger 31 may flow to the liquid pipe 50 through the connection liquid pipe 61 .

The refrigerant condensed in the indoor heat exchanger 21 and the refrigerant condensed in the heat storage heat exchanger 31 may be combined in the liquid pipe 50 and may flow to the outdoor unit 10 along the liquid pipe 50 .

The refrigerant flowing into the outdoor unit 10 may pass through the outdoor expansion device 17 and be throttled. The refrigerant throttled in the outdoor expansion device 17 flows into the outdoor heat exchanger 16 and may be evaporated in the outdoor heat exchanger 16 . The refrigerant evaporated in the outdoor heat exchanger 16 may pass through the first four sides 15 and flow into the suction pipe 13 . The refrigerant flowing through the suction pipe 13 may pass through the accumulator 14 and be sucked into the compressor 11 .

The compressor 11 may compress the sucked refrigerant and discharge it back to the discharge pipe 12, and the refrigerant may circulate along the path described above.

6 is a diagram illustrating a flow direction of a refrigerant in a heating operation mode using heat storage.

The controller 90 may control the air conditioning system in a heat storage use heating operation mode. The heat storage use heating operation mode may be a mode in which heat stored in the heat storage tank 30 is used to reduce a heating load that the outdoor unit 10 bears.

The heat storage use heating operation mode may be performed when a peak load occurs in the indoor unit 20 . As a result, the heat storage tank 30 serves as an evaporator to assist the outdoor heat exchanger 10, thereby improving temporary heating capacity and improving the heating efficiency of the air conditioning system.

In the heat storage use heating operation mode, the control module 90 may fully open the indoor expansion device 22 and control the outdoor expansion device 17 and the heat storage expansion device 52 at preset expansion and opening degrees. However, when there are a plurality of indoor units 20 and only some of them are operated, the controller 90 fully opens the indoor expansion mechanism 22 of the indoor unit 20 in operation and the indoor expansion mechanism of the indoor unit 20 in operation is suspended. (22) can be fully closed.

In addition, in the heat storage use heating operation mode, the controller 90 may close the low pressure on-off valve 72 and the second on-off valve 83 and open the high-pressure on-off valve 82 and the first on-off valve 73.

In addition, in the heat storage use heating operation mode, the controller 90 controls the first four sides 15 so that the outdoor heat exchanger 16 communicates with the suction pipe 13, and the high-pressure engine 80 connects with the discharge pipe 12. The second four sides 18 can be controlled to communicate.

Hereinafter, the flow of the refrigerant in the heat storage use heating operation mode will be described.

The refrigerant compressed in the compressor 11 and discharged through the discharge pipe 12 may pass through the second four sides 18 and flow into the high-pressure engine 80 . Since the high-pressure on-off valve 82 is open and the second on-off valve 83 is closed, the refrigerant flowing into the high-pressure engine 80 can flow to the main engine 60 along the high-pressure engine 80.

Since the low pressure on/off valve 72 is closed, the refrigerant flowing into the main engine 60 can flow into the indoor heat exchanger 21 of the indoor unit 20 . The refrigerant flowing into the indoor heat exchanger 21 is condensed in the indoor heat exchanger 21 and can perform heating. The refrigerant condensed in the indoor heat exchanger 21 may flow into the liquid pipe 50 .

Some of the refrigerant flowing through the liquid pipe 50 may flow to the connection liquid pipe 51 connected to the liquid pipe 50, and the other part may flow to the outdoor unit 10 through the liquid pipe 50.

The refrigerant flowing into the outdoor unit 10 through the liquid pipe 50 may pass through the outdoor expansion device 17 and be throttled. The refrigerant throttled in the outdoor expansion device 17 flows into the outdoor heat exchanger 16 and may be evaporated in the outdoor heat exchanger 16 . The refrigerant evaporated in the outdoor heat exchanger 16 may pass through the first four sides 15 and flow into the suction pipe 13 .

Meanwhile, the refrigerant flowing from the liquid pipe 50 to the connection liquid pipe 51 may pass through the heat storage expansion mechanism 52 and be throttled. The refrigerant throttled in the thermal storage expansion mechanism 52 may flow to the thermal storage heat exchanger 31 . The refrigerant flowing into the thermal storage heat exchanger 31 may be evaporated by heat accumulated in the thermal storage material in the thermal storage heat exchanger 31 . The refrigerant evaporated in the heat storage heat exchanger 31 may flow to the main connection organ 61 . Since the second on/off valve 83 is closed and the first on/off valve 73 is open, the refrigerant of the main connecting organ 61 passes through the first connecting organ 71 and flows to the low pressure engine 70. can Since the low pressure opening/closing valve 72 is in a closed state, the refrigerant flowing into the low pressure engine 70 can flow to the suction pipe 13 of the outdoor unit 10 along the low pressure engine 70 .

The refrigerant evaporated in the outdoor heat exchanger 16 and the refrigerant evaporated in the heat storage heat exchanger 31 may be combined in the suction pipe 13 and may pass through the accumulator 14 and be sucked into the compressor 11.

The compressor 11 may compress the sucked refrigerant and discharge it back to the discharge pipe 12, and the refrigerant may circulate along the path described above.

The above description is merely an example of the technical idea of the present invention, and various modifications and variations can be made to those skilled in the art without departing from the essential characteristics of the present invention.

Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments.

The protection scope of the present invention should be construed according to the claims below, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

10: outdoor unit 11: compressor
12: discharge pipe 13: suction pipe
15: first four sides 16: outdoor heat exchanger
17: outdoor expansion device 18: second quadrilateral
20: indoor unit 21: indoor heat exchanger
22: indoor expansion mechanism 30: heat storage tank
31: thermal storage heat exchanger 40: thermal storage distributor
50: liquid pipe 51: connection liquid pipe
52: heat storage expansion mechanism 60: main engine
61: main connecting organ 70: low pressure organ
71: first connection organ 72: low pressure on-off valve
73: first on-off valve 80: high-pressure engine
81: second connection organ 82: high pressure on-off valve
83: second on-off valve

Claims (16)

An outdoor unit comprising a compressor connected to a suction pipe and a discharge pipe, an outdoor heat exchanger, a first four-way side selectively connecting the outdoor heat exchanger to the suction pipe or the discharge pipe, and a second four-way side connected to the discharge pipe and the suction pipe. ;
at least one indoor unit including an indoor heat exchanger;
A heat storage tank including a heat storage heat exchanger;
a heat storage distributor connecting the outdoor unit, the indoor unit, and the heat storage tank;
a liquid pipe connecting the outdoor heat exchanger to the indoor heat exchanger;
a low pressure engine connecting the indoor heat exchanger to the suction pipe;
a high-pressure engine connecting the second quadrilateral and the indoor heat exchanger;
a connecting liquid pipe connecting the liquid pipe and the thermal storage heat exchanger;
a first connection engine connecting the heat storage heat exchanger and the low pressure engine; and
A second connection engine connecting the heat storage heat exchanger and the high-pressure engine,
The heat storage distributor,
a first on/off valve installed in the first connecting organ;
a second on/off valve installed in the second connection organ;
a low pressure opening/closing valve installed in the low pressure engine;
a high-pressure on-off valve installed in the high-pressure engine;
a thermal storage expansion mechanism installed in the connecting liquid pipe; and
An air conditioning system including a controller controlling an opening degree of the heat storage expansion mechanism. delete According to claim 1,
The controller,
In the storage cooling operation mode in which the refrigerant is evaporated in the indoor heat exchanger and the storage heat exchanger or in the heat storage heating operation mode in which the refrigerant is evaporated in the outdoor heat exchanger and the storage heat exchanger, the thermal storage expansion mechanism is controlled at a preset expansion opening degree air conditioning system. According to claim 1,
The controller,
An air conditioning system that fully opens the thermal storage expansion mechanism in a cooling operation mode for storage use in which the refrigerant is condensed in the outdoor heat exchanger and the storage heat exchanger or in a storage heating operation mode in which the refrigerant is condensed in the indoor heat exchanger and the storage heat exchanger. delete delete delete delete According to claim 1,
In the storage cooling operation mode in which the refrigerant evaporates in the indoor heat exchanger and the storage heat exchanger or in the heat storage heating operation mode in which the refrigerant evaporates in the outdoor heat exchanger and the storage heat exchanger, the low pressure on-off valve and the first on-off valve are opened, The air conditioning system further comprises a controller that closes the high pressure on-off valve and the second on-off valve. According to claim 1,
In the case of the storage cooling operation mode in which the refrigerant is condensed in the outdoor heat exchanger and the storage heat exchanger or in the storage heating operation mode in which the refrigerant is condensed in the indoor heat exchanger and the storage heat exchanger, the low pressure on-off valve and the first on-off valve are closed. The air conditioning system further comprises a controller that opens the high pressure on-off valve and the second on-off valve. delete delete delete delete delete delete

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