KR20220105866A - Gas Engine Heat Pump - Google Patents

Abstract

The present invention relates to a heat pump of a gas engine. According to the present invention, the heat pump of a gas engine comprises: a compressor compressing a refrigerant; an engine operated by combusting fuel and operating the compressor; a cooling water pump allowing cooling water cooling the engine to flow; a first heat exchanger where the refrigerant discharged from the compressor exchanges heat with air; a second heat exchanger where the cooling water, of which the heat is exchanged in the engine, exchanges heat with the refrigerant introduced to the compressor; and a third heat exchanger where a portion of the refrigerant flowing from the first heat exchanger and the cooling water, of which the heat is exchanged in the engine, exchange the heat.

Description

Gas Engine Heat Pump

The present invention relates to a gas engine heat pump, and more particularly, to a gas engine heat pump for driving an engine and driving a compressor.

The gas engine heat pump may be driven by an engine by combustion of fuel, and a refrigerant of the heat pump may flow by driving a compressor connected to the engine, thereby controlling the temperature of indoor air. In a gas engine heat pump, cooling water is circulated to cool the engine or gas discharged from the engine, and the cooling water heated in the engine or the like may be cooled through heat exchange with a refrigerant or heat exchange with external air.

The gas engine heat pump may exchange cooling water with a refrigerant or air according to a cooling or heating mode. That is, in the heating mode, the cooling water may exchange heat with the refrigerant through the plate heat exchanger, and in the cooling mode, the cooling water may exchange heat with the air by using a radiator.

In the case of the radiator, it is disposed inside a heat exchanger that exchanges heat with the refrigerant and external air, and the cooling water can be cooled by forced circulation of air according to the driving of the blower fan. However, since the radiator is disposed adjacent to the inside of the heat exchanger where the refrigerant exchanges heat with air, the performance of both the radiator and the heat exchanger may be deteriorated due to the heat from the radiator and the heat from the heat exchanger.

Korean Patent Laid-Open No. 1020100086545 discloses a structure in which a radiator for heat-exchanging cooling water with outside air and a heat exchanger for heat-exchanging a refrigerant with outside air are disposed in adjacent regions. This structure, still, has an insufficient problem in securing the performance of the radiator and the heat exchanger.

SUMMARY OF THE INVENTION An object of the present invention is to provide a gas engine heat pump capable of securing cooling performance of a coolant even in a cooling mode.

Another object of the present invention is to provide a gas engine heat pump capable of maintaining the efficiency of the heat pump while ensuring the cooling performance of the coolant.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, a gas engine heat pump according to an embodiment of the present invention flows a compressor for compressing a refrigerant, an engine for driving by burning fuel, and an engine for operating the compressor, and cooling water for cooling the engine and a first heat exchanger that heat-exchanges the refrigerant discharged from the compressor with air; Since a third heat exchanger for exchanging a part of the refrigerant with the cooling water heat-exchanged in the engine, the cooling water is exchanged only through the refrigerant, so that the cooling performance of the cooling water can be improved.

Further comprising a coolant valve for sending the coolant flowing from the engine to the second heat exchanger or the third heat exchanger, the coolant flows to the second heat exchanger or the third heat exchanger according to a cooling mode or a heating mode of the gas engine heat pump can do it

and a four-way valve for sending the refrigerant discharged from the compressor to the first heat exchanger or an indoor unit for controlling the temperature of the indoor space, wherein the four-way valve sends the refrigerant discharged from the compressor to the first heat exchanger, The coolant valve may send the coolant flowing from the engine to the third heat exchanger to exchange heat with a portion of the coolant flowing from the first heat exchanger.

It is disposed in the indoor space and further includes an indoor unit including an indoor heat exchanger for exchanging air with a refrigerant, wherein when the refrigerant flows from the first heat exchanger to the indoor heat exchanger, the third heat exchanger is connected to the first heat exchanger. By exchanging a portion of the refrigerant flowing from the cooling water with the cooling water, the cooling water may be cooled using a portion of the refrigerant flowing from the first heat exchanger in the cooling mode.

and a four-way valve for sending the refrigerant discharged from the compressor to the first heat exchanger or the indoor heat exchanger, wherein when the four-way valve sends the refrigerant discharged from the compressor to the indoor heat exchanger, The refrigerant may flow to the second heat exchanger, and the cooling water may be cooled using a portion of the refrigerant flowing from the first heat exchanger in the cooling mode.

and an expansion valve for controlling a flow rate of the refrigerant supplied to the third heat exchanger, wherein the expansion valve is supplied to the third heat exchanger when the four-way valve sends the refrigerant discharged from the compressor to the indoor heat exchanger By blocking the refrigerant, cooling of the cooling water can be concentrated in the second heat exchanger in the heating mode.

and an accumulator that separates the refrigerant flowing into the compressor and supplies the gaseous refrigerant to the compressor, wherein the refrigerant flowing from the third heat exchanger is supplied to the accumulator and flows from the third heat exchanger A portion of the refrigerant may be supplied to the compressor through the third heat exchanger.

The third heat exchanger may include a plurality of refrigerant tubes through which the refrigerant flows, and a plurality of cooling water tubes disposed on the outer periphery of the plurality of refrigerant tubes and through which the cooling water flows, thereby increasing an area for heat exchange between the cooling water and the refrigerant.

The flow direction of the coolant flowing through the plurality of coolant pipes and the flow direction of the coolant flowing through the plurality of coolant pipes are opposite to each other, so that heat exchange performance can be improved.

The plurality of coolant pipes and the plurality of coolant pipes may be arranged in a bent shape around the accumulator to minimize the flow path area of the coolant.

Further comprising a liquid pipe through which the refrigerant discharged from the first heat exchanger flows, and a branch pipe branched from the liquid pipe and connected to the third heat exchanger, a portion of the refrigerant flowing through the liquid pipe can be sent to the third heat exchanger have.

An expansion valve for expanding or blocking the refrigerant flowing to the third heat exchanger may be disposed in the branch pipe, and the expansion valve may expand the refrigerant flowing through the branch pipe or block the flow of the refrigerant.

The third heat exchanger includes a plurality of refrigerant pipes through which the refrigerant flows, a plurality of cooling water pipes disposed on the outer periphery of each of the plurality of refrigerant pipes and through which the cooling water flows, and the refrigerant introduced from the branch pipe to the plurality of refrigerants. a refrigerant pipe header sent to the pipe; a first cooling water pipe header disposed upstream of the plurality of cooling water pipes to distribute cooling water to the plurality of cooling water pipes; and a second cooling water pipe header.

and an accumulator that separates the refrigerant flowing into the compressor and supplies the gaseous refrigerant to the compressor, wherein the third heat exchanger is disposed downstream of the plurality of refrigerant tubes, and laminates the plurality of refrigerant tubes, , It is possible to supply the refrigerant that has passed through the third heat exchanger to the accumulator by further comprising a lamination pipe connected to the accumulator.

The details of other embodiments are included in the detailed description and drawings.

According to the gas engine heat pump of the present invention, there are one or more of the following effects.

First, a portion of the refrigerant flowing from the first heat exchanger is sent to the third heat exchanger to exchange heat with the cooling water and the refrigerant, so that the cooling water is excellent even in the cooling mode.

Second, there is an advantage in that the refrigerant discharged from the third heat exchanger is sent to the compressor through the accumulator to effectively cool the cooling water while securing refrigeration performance.

The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1A is a schematic configuration diagram of a gas engine heat pump according to an embodiment of the present invention, and a diagram illustrating a flow of a fluid in a cooling mode.
1B is a view showing a flow of fluid in a heating mode of a gas engine heat pump according to an embodiment of the present invention.
2 is a diagram schematically illustrating the flow and heat exchange of a refrigerant and a coolant in a third heat exchanger according to an embodiment of the present invention.
3 is a view for explaining the arrangement and form of the third heat exchanger according to an embodiment of the present invention.
4 is a view for explaining the form and configuration of the third heat exchanger according to an embodiment of the present invention.
5 is a diagram comparing the pressure-enthalpy diagram of the conventional gas engine heat pump and the gas engine heat pump of the present invention.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, the present invention will be described with reference to the drawings for explaining a gas engine heat pump according to embodiments of the present invention.

Referring to FIG. 1 , the gas engine heat pump 1 is connected to an outdoor unit (ODU) and an outdoor unit (ODU) that operate the compressor 14 by driving the engine 10 to control the temperature of the indoor space. It may include an indoor unit (IDU).

The outdoor unit (ODU, hereinafter, 'gas engine heat pump') of the gas engine heat pump 1 is driven by burning a mixed fuel (hereinafter, 'mixer') in which air and gas fuel are mixed into a plurality of cylinders (not shown). the engine 10, the engine 10 and the belt 12 connected to each other, the driven compressor 14, the first heat exchanger 16 that heat-exchanges the refrigerant discharged from the compressor 14 with outdoor air, the engine ( In the cooling water pump 18 for flowing the cooling water for cooling 10), the second heat exchanger 20 for exchanging the cooling water discharged from the engine 10 with the refrigerant flowing into the compressor 14, and the first heat exchanger 16 and a third heat exchanger 50 for exchanging a portion of the refrigerant discharged and flowing into the indoor unit (IDU) and the cooling water.

The gas engine heat pump 1 includes an exhaust gas heat exchanger 22 that heat-exchanges the exhaust gas discharged from the engine 10 and cooling water, and the second heat exchanger 20 or the third heat exchanger 22 for cooling water discharged from the engine 10 . The first coolant valve 24 that sends to the heat exchanger 50, the second coolant valve 26 that sends the coolant discharged from the engine 10 to the first coolant valve 24 or the coolant pump 18, the coolant pump ( 18) may include a cooling water tank 28 for replenishing the cooling water with the cooling water flowing to the flow.

The gas engine heat pump (1) separates the refrigerant flowing to the compressor (14), the accumulator (30) supplies the gaseous refrigerant to the compressor (14), and the refrigerant discharged from the compressor (14) to the indoor unit ( IDU) or a switching valve 32 sent to the first heat exchanger 16, and a supercooler 34 that expands a part of the refrigerant discharged from the first heat exchanger 16, and exchanges heat with the flowing refrigerant. may include more.

The gas engine heat pump (1) has a first expansion valve (36) for expanding the refrigerant discharged from the indoor unit (IDU) and flowing to the first heat exchanger (16), and the refrigerant flowing into the second heat exchanger (20). It may include a second expansion valve 38 that expands the , and a third heat exchanger 50 that expands the refrigerant flowing to the third heat exchanger 50 .

The gas engine heat pump 1 may further include a supercooler expansion valve 40 for expanding the refrigerant flowing into the subcooler 34 .

The gas engine heat pump 1 may operate in a heating mode (HM) and a cooling mode (CM). The heating mode (HM) and the cooling mode (CM) may be set based on the indoor unit (IDU). That is, the gas engine heat pump 1 operates in the heating mode (HM) when the indoor unit (IDU) supplies heated air to the indoor space, and the indoor unit (IDU) supplies cooled air to the indoor space. When this occurs, it can operate in the cooling mode (CM).

Referring to FIG. 1A , in the heating mode (HM), the refrigerant discharged from the compressor 14 flows to the indoor unit (IDU), and the refrigerant flowing from the indoor unit (IDU) is in the second heat exchanger (20). Through the, it can flow to the compressor (14).

Referring to FIG. 1A , in the heating mode HM, the cooling water flowing by the cooling water pump 18 may exchange heat with the refrigerant through the second heat exchanger 20 .

Referring to FIG. 1B , in the cooling mode (CM), the refrigerant discharged from the compressor 14 flows to the first heat exchanger 16 , and the refrigerant flowing from the first heat exchanger 16 is converted into an indoor unit (IDU). ) through the compressor (14). In the cooling mode (CM), a portion of the refrigerant flowing in the first heat exchanger 16 may flow to the third heat exchanger 50 . The refrigerant flowing through the third heat exchanger 50 may exchange heat with the cooling water to flow to the accumulator 30 . In the cooling mode (CM), the coolant flowing by the coolant pump 18 may exchange heat with the coolant through the third heat exchanger 50 .

The coolant flowing through the gas engine heat pump (1) is to exchange heat obtained from the engine (10) and the exhaust gas heat exchanger (22) with the refrigerant through the second heat exchanger (20) or the third heat exchanger (50). can Referring to FIG. 1B , in the cooling mode (CM), cooling water flows to the third heat exchanger 50 to be cooled. Referring to FIG. 1A , in the heating mode HM, cooling water flows to the second heat exchanger 20 and is cooled.

Referring to FIG. 2 , the third heat exchanger 50 may heat-exchange the refrigerant flowing through the inside and the outside of the tube through which the refrigerant flows, and exchange heat between the refrigerant and the cooling water. Accordingly, the coolant may be cooled by applying heat to the coolant, and the coolant may be vaporized by receiving the heat of the coolant.

Referring to FIG. 2 , the flow direction of the coolant and the flow direction of the coolant in the third heat exchanger 50 may be formed to be different from each other.

Referring to FIG. 3 , the third heat exchanger 50 includes the refrigerant flowing through the liquid pipe 42 connecting the first heat exchanger 16 and the indoor heat exchanger (not shown) disposed in the indoor unit (IDU). some are moving The branch pipe 54 branched from the liquid pipe 42 is connected to the third heat exchanger 50 , so that a portion of the refrigerant flowing through the liquid pipe 42 may flow to the third heat exchanger 50 . The refrigerant flowing into the third heat exchanger 50 may be introduced in an expanded state through the third heat exchanger 50 .

The refrigerant flowing through the third heat exchanger 50 may exchange heat with the cooling water, and may be phase-changed into a gaseous state.

Referring to FIG. 3 , the branch pipe 54 connected to the third heat exchanger 50 may be branched from the liquid pipe 42 passing through the supercooler 34 . A third heat exchanger 50 for controlling the flow of the refrigerant flowing to the third heat exchanger 50 is disposed in the branch pipe 54 . The third heat exchanger 50 opens and closes the branch pipe 54 with the third heat exchanger 50 or adjusts the opening degree of the branch pipe 54 to expand the refrigerant flowing to the third heat exchanger 50 . can

Referring to FIGS. 3 to 4 , the third heat exchanger 50 includes a plurality of refrigerant pipes 56 through which a refrigerant flows and a plurality of cooling water pipes arranged on the outer periphery of the plurality of refrigerant pipes 56 and through which the cooling water flows. tube 60 . The coolant pipe 60 is disposed on the outer periphery of the coolant pipe 56 so that the coolant and the coolant can exchange heat.

Referring to FIG. 3 , the plurality of coolant pipes 56 and the plurality of coolant pipes 60 may be arranged to be bent around the accumulator 30 . The refrigerant discharged from the third heat exchanger 50 flows to the accumulator 30 . Accordingly, the third heat exchanger 50 may be disposed around the accumulator 30 to minimize the flow path leading to the accumulator 30 .

Referring to FIG. 4 , the third heat exchanger 50 includes a plurality of refrigerant pipes 56 through which the refrigerant flows, and a plurality of cooling water pipes 60 disposed on the outer periphery of the plurality of refrigerant pipes 56 and through which the cooling water flows. ), disposed upstream of the plurality of coolant pipes 56 , the coolant pipe header 58 for sending the coolant flowing in from the branch pipe 54 to the plurality of coolant pipes 56 , upstream of the plurality of coolant pipes 60 . A second cooling water pipe header ( 64 ), and a plurality of refrigerant tubes ( 56 ) arranged downstream to laminate a plurality of refrigerant tubes ( 56 ), and a lamination tube ( 66 ) connected to the accumulator ( 30 ).

In the third heat exchanger 50 , the flow of the refrigerant flowing through the refrigerant pipe 56 and the flow of the cooling water flowing through the cooling water pipe 60 may be opposite to each other.

Referring to FIG. 5 , the gas engine heat pump 1 of the present invention does not deteriorate the refrigeration performance (coefficient of performance) compared to the conventional gas engine heat pump. In the gas engine heat pump 1 of the present invention, since a portion of the refrigerant flows to the third heat exchanger 50 from the rear end of the supercooler 34, the flow rate of the refrigerant flowing to the indoor unit (IDU) is reduced, so that the cooling capacity is reduced. can decrease. However, since the refrigerant flowing into the third heat exchanger 50 lowers the temperature of the refrigerant flowing into the compressor 14 , the work of the compressor 14 may be reduced. Therefore, the overall refrigeration performance may be similar or improved compared to the conventional gas engine heat pump.

In the above, preferred embodiments of the present invention have been illustrated and described, but the present invention is not limited to the specific embodiments described above, and in the technical field to which the present invention pertains without departing from the gist of the present invention as claimed in the claims. Various modifications may be made by those of ordinary skill in the art, and these modifications should not be individually understood from the technical spirit or perspective of the present invention.

1: gas engine heat pump 10: engine
14: compressor 16: first heat exchanger
18: cooling water pump 20: second heat exchanger
22: exhaust gas heat exchanger 24: first cooling water valve
26: second coolant valve 28: coolant tank
30: accumulator 32: switching valve
34: supercooler 36: first expansion valve
38: second expansion valve 40: supercooler expansion valve
42: liquid pipe 50: third heat exchanger
52: third expansion valve 54: branch pipe
56: refrigerant pipe 58: refrigerant pipe header
60: cooling water pipe 62: first cooling water pipe header
64: second cooling water pipe header 66: laminated pipe

Claims (14)

a compressor that compresses the refrigerant;
an engine for driving by burning fuel and operating the compressor;
a coolant pump for flowing coolant for cooling the engine;
a first heat exchanger for exchanging the refrigerant discharged from the compressor with air;
a second heat exchanger for exchanging heat exchanged between the coolant heat-exchanged in the engine and the refrigerant flowing into the compressor;
and a third heat exchanger for exchanging a portion of the refrigerant flowing from the first heat exchanger and the coolant heat-exchanged in the engine. The method of claim 1,
The gas engine heat pump further comprising a coolant valve for sending the coolant flowing from the engine to the second heat exchanger or the third heat exchanger. 3. The method of claim 2,
Further comprising a four-way valve for sending the refrigerant discharged from the compressor to the first heat exchanger or an indoor unit for controlling the temperature of the indoor space,
When the four-way valve sends the refrigerant discharged from the compressor to the first heat exchanger, the cooling water valve sends the coolant flowing from the engine to the third heat exchanger. The method of claim 1,
It is disposed in the indoor space, further comprising an indoor unit including an indoor heat exchanger for exchanging refrigerant and air,
When the refrigerant flows from the first heat exchanger to the indoor heat exchanger, the third heat exchanger exchanges a portion of the refrigerant flowing from the first heat exchanger with cooling water. 5. The method of claim 4,
Further comprising a four-way valve for sending the refrigerant discharged from the compressor to the first heat exchanger or the indoor heat exchanger,
When the four-way valve sends the refrigerant discharged from the compressor to the indoor heat exchanger, the refrigerant discharged from the indoor heat exchanger flows to the second heat exchanger. 6. The method of claim 5,
Further comprising an expansion valve for controlling the flow rate of the refrigerant supplied to the third heat exchanger,
The expansion valve may be configured to block the refrigerant supplied to the third heat exchanger when the four-way valve sends the refrigerant discharged from the compressor to the indoor heat exchanger. The method of claim 1,
and an accumulator for separating the refrigerant flowing into the compressor and supplying the gaseous refrigerant to the compressor,
A gas engine heat pump in which the refrigerant flowing from the third heat exchanger is supplied to the accumulator. 8. The method of claim 7,
The third heat exchanger is a gas engine heat pump comprising: a plurality of refrigerant pipes through which a refrigerant flows; 9. The method of claim 8,
A gas engine heat pump in which a flow direction of the coolant flowing through the plurality of coolant pipes and a flow direction of the coolant flowing through the plurality of coolant pipes are opposite to each other. 9. The method of claim 8,
The plurality of refrigerant pipes and the plurality of coolant pipes are arranged in a bent shape around the accumulator. The method of claim 1,
a liquid pipe through which the refrigerant discharged from the first heat exchanger flows;
The gas engine heat pump further comprising a branch pipe branched from the liquid pipe and connected to the third heat exchanger. 12. The method of claim 11,
An expansion valve for expanding or blocking the refrigerant flowing to the third heat exchanger is disposed in the branch pipe. The method of claim 1,
The third heat exchanger,
a plurality of refrigerant pipes through which the refrigerant flows;
a plurality of coolant pipes disposed on the outer periphery of each of the plurality of coolant pipes through which coolant flows;
a refrigerant pipe header for sending the refrigerant flowing in from the branch pipe to the plurality of refrigerant pipes;
a first cooling water pipe header disposed upstream of a plurality of cooling water pipes to distribute cooling water to the plurality of cooling water pipes; and
and a second cooling water pipe header disposed around the refrigerant pipe header and to which the plurality of cooling water pipes are laminated. 14. The method of claim 13,
and an accumulator for separating the refrigerant flowing into the compressor and supplying the gaseous refrigerant to the compressor,
The third heat exchanger, disposed downstream of the plurality of refrigerant tubes, laminating the plurality of refrigerant tubes, gas engine heat pump further comprising a lamination tube connected to the accumulator.

Images