KR101400847B1 - A heat pump system utilizing geothermal - Google Patents

Abstract

The present invention relates to a heat pump system using geothermal heat. More specifically, water of a place used and a refrigerant exchange heat while a portion of transferred water is heated by an additional third heat exchanger of an inverter type, and the refrigerant used in the heat exchange of a first heat exchanger is cooled below a preset temperature at the same time. The power consumption is low compared to a method of cooling a refrigerant using a traditional economizer, thereby increasing the coefficient of performance and overall calories at the same time.

Description

[0001] Heat pump system using geothermal heat [0002]

[0001] The present invention relates to a heat pump system using geothermal heat, and more particularly, to a heat pump system using geothermal heat, in which water used in a place of use is exchanged with a refrigerant gas, a part of water transferred from a place of use is heated through a third inverter- The present invention relates to a heat pump system using geothermal heat that has lower power consumption than that of cooling a refrigerant by a conventional economizer by cooling the refrigerant heat exchanged at a set temperature or lower, will be.

Generally, there are fossil fuels such as petroleum and natural gas, etc., which are used in domestic and industrial energy sources. Since the use of such energy sources not only causes the main cause of environmental pollution but also has a limited amount of reserves, The development of alternative energy is actively under way.

In addition, energy sources used for heating and cooling include fossil fuels such as coal, oil, and natural gas, or electric energy produced by using these fossil fuels or nuclear power.

However, since fossil fuels have a disadvantage of polluting the water quality and the environment due to various pollutants generated in the combustion process, in recent years, development of alternative energy capable of replacing them has been actively carried out.

Among these alternative energies, studies on wind power, solar heat, geothermal energy, etc., which have infinite energy sources, are being used, and these energy sources have the advantage of obtaining energy without affecting air pollution and climate change On the other hand, the energy density is very low.

In particular, in order to obtain energy using wind power and solar heat, it is necessary to secure a large area along with the limit of the installation site, and these devices have a low energy production capacity per unit device and a large installation and maintenance cost.

Geothermal energy, which is a part of alternative energy, is used for power generation by using high-temperature geothermal heat in deep underground, and it is applied to heating and cooling system using geothermal heat at 10 ~ 20 ℃. It is applied to heating and cooling technology It is possible to save energy by 40% or more compared with the conventional heating and cooling apparatus, and it is known that it can reduce the energy generation cost by 40 ~ 70%.

The geothermal heat pump system, which is an electric device using natural heat storage such as ground water for the purpose of cooling and heating the building using the geothermal heat, is equipped with a geothermal heat exchanger so that heat is released to the ground during the summer season by the heat exchanger, So that the cooling and heating performance is not lowered due to the geothermal temperature maintaining a substantially constant temperature at 10 to 20 ° C throughout the year, and stable operation is possible.

Therefore, there are many heating and cooling devices using geothermal energy that are relatively inexpensive to install and maintain. This is a technology using the thermal energy of the ground, which is 10 to 20 ° C in temperature.

A commonly used heat pump apparatus using geothermal heat is composed of a geothermal heat exchanger for recovering geothermal heat and a heat pump for cooling and heating by moving the recovered geothermal heat to a required place.

The heat pump apparatus using the conventional geothermal heat exchanges heat with the refrigerant gas (for the compressor) to the refrigerant gas (for the compressor) through the condenser and heat-exchanges with the refrigerant gas (for the compressor) Since the heat exchanged refrigerant gas (for the compressor) is at a high temperature (about 45 ° C), there is a problem that the total heat quantity is lowered when the heat exchanged in the evaporator after expansion in the expansion valve.

In order to solve this problem, the refrigerant gas (for the compressor) heat exchanged in the condenser is sent to the expansion valve by using a separate heat exchanger, an economizer or the like while lowering the temperature.

However, the use of the economizer or the like causes a problem that the overall power consumption increases greatly and the COP value falls accordingly.

Korean Patent Registration No. 10-0470909

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art,

The water used and the refrigerant gas are heat-exchanged, and a part of the water transferred from the place of use is heated through a separate inverter-type third heat exchanger while cooling the heat-exchanged refrigerant in the first heat exchanger to a set temperature or lower, The present invention provides a heat pump system using geothermal heat that consumes less power than cooling a refrigerant, thereby increasing the COP and simultaneously increasing the total heat quantity.

In order to achieve the above object, the present invention provides a refrigerator comprising: a compressor for converting a refrigerant into a high temperature and a high pressure;

A 4-way valve installed on the outlet side of the compressor for selectively delivering high-temperature and high-pressure refrigerant of the compressor to various devices;

A first heat exchanger connected to the 4-way valve for heating the high-temperature high-pressure refrigerant of the compressor and the water used;

An expansion valve connected to the first heat exchanger and expanding a refrigerant heat-exchanged;

A second heat exchanger connected between the expansion valve and the 4-way valve for evaporating the refrigerant by heat exchange between the refrigerant expanded in the expansion valve and the external geothermal heat;

A third heat exchanger provided between the first heat exchanger and the expansion valve for transferring a part of water to be used to be transferred to the first heat exchanger and performing heat exchange with the refrigerant heat exchanged in the first heat exchanger to heat water and convert the refrigerant to a low temperature; And more particularly, to a heat pump system using geothermal heat.

As described above, in the heat pump system using the geothermal heat of the present invention, the water to be used is heat-exchanged with the refrigerant gas, and a part of water transferred from the place of use is heated through a separate inverter type third heat exchanger, Cooling the heat exchanged refrigerant at the set temperature or lower to lower the power consumption of the refrigerant by cooling the refrigerant by the conventional economizer, thereby increasing the COP and increasing the total heat amount.

1 is a schematic view showing a heat pump system using geothermal heat according to an embodiment of the present invention.

The present invention has the following features in order to achieve the above object.

The present invention relates to a refrigerating machine comprising a compressor for converting refrigerant into high temperature and high pressure;

A 4-way valve installed on the outlet side of the compressor for selectively delivering high-temperature and high-pressure refrigerant of the compressor to various devices;

A first heat exchanger connected to the 4-way valve for heating the high-temperature high-pressure refrigerant of the compressor and the water used;

An expansion valve connected to the first heat exchanger and expanding a refrigerant heat-exchanged;

A second heat exchanger connected between the expansion valve and the 4-way valve for evaporating the refrigerant by heat exchange between the refrigerant expanded in the expansion valve and the external geothermal heat;

A third heat exchanger provided between the first heat exchanger and the expansion valve for transferring a part of water to be used to be transferred to the first heat exchanger and performing heat exchange with the refrigerant heat exchanged in the first heat exchanger to heat water and convert the refrigerant to a low temperature; And the like.

The present invention having such characteristics can be more clearly described by the preferred embodiments thereof.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Before describing in detail several embodiments of the present invention with reference to the accompanying drawings, it is to be understood that the present invention is not limited to the details of construction and the arrangement of components shown in the following detailed description or illustrated in the drawings will be. The invention may be embodied and carried out in other embodiments and carried out in various ways. It should also be noted that the device or element orientation (e.g., "front," "back," "up," "down," "top," "bottom, Expressions and predicates used herein for terms such as "left," " right, "" lateral, " and the like are used merely to simplify the description of the present invention, Or that the element has to have a particular orientation. Also, terms such as " first "and" second "are used herein for the purpose of the description and the appended claims, and are not intended to indicate or imply their relative importance or purpose.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

1 is a schematic view showing a heat pump system using geothermal heat according to an embodiment of the present invention.

1, the heat pump system using geothermal heat of the present invention includes a compressor 10, a 4-way valve 30, a first heat exchanger 40, an expansion valve 50, 2 heat exchanger (60), and a third heat exchanger (30).

The compressor 10 converts the refrigerant heat-exchanged in the second heat exchanger 60 to high temperature and high pressure, and an accumulator is connected to the inlet side of the compressor 10 by piping. At this time, the function of the accumulator is the same as that of a general accumulator.

The 4-way valve 30 is connected to various devices by a pipe to selectively transfer the high-temperature high-pressure refrigerant of the compressor 10 to various devices. At this time, the various devices are connected to the compressor 10, 1 heat exchanger 40 and a second heat exchanger 60 to deliver the high temperature and high pressure refrigerant of the compressor 10 to the first heat exchanger 40 and the second heat exchanger 60 to perform heat exchange And the transferred refrigerant is delivered to the compressor 10 again.

At this time, the process is performed at the time of heating or hot water supply, and the process is reversed at the time of cooling.

The first heat exchanger 40 is connected to the 4-way valve 30 to exchange heat between the high temperature high pressure refrigerant (refrigerant gas) of the compressor 10 and the water supplied to the place of use (not shown) By way of example, water is transferred from the outside to the first heat exchanger (40), exchanged with heat, and then transferred to the place of use through the pipe.

 The pipes connected to the first heat exchanger 40 from outside are respectively provided with temperature sensors for checking the temperature of the internal water to be transferred, and they are formed on the inlet / outlet sides of the first heat exchanger 40 .

The second heat exchanger 60 is connected between the expansion valve 50 and the 4-way valve 30 to heat-exchange the refrigerant expanded in the expansion valve 50 with the external geothermal heat. The second heat exchanger 60 And the refrigerant is evaporated by heating the refrigerant from the external geothermal heat. At this time, the second heat exchanger (60) is further provided with a geothermal heat exchanger (not shown) on the ground for heat exchange with the external geothermal heat to transfer the heat source in the ground.

In this case, a temperature sensor is installed in the pipe connected to the second heat exchanger 60 to check the temperature of the internal geothermal heat, and the temperature sensor is provided on the inlet / outlet side of the second heat exchanger 60 Respectively.

Meanwhile, the first heat exchanger 40 and the second heat exchanger 60 are connected by a pipe. In a typical heat pump system, an expansion valve is installed in a pipe connected between the first heat exchanger 40 and the second heat exchanger 60. In the present invention, A bypass pipe 80 is further installed.

1, the bypass pipe 80 is formed in a pipe connecting between the first heat exchanger 40 and the second heat exchanger 60, and the bypass pipe 80 is provided with a separate auxiliary pipe The auxiliary bypass pipe 81 is connected to the third heat exchanger 30 and connected to the pipe connecting the first heat exchanger 40 and the second heat exchanger 60 do.

At this time, the pipe for connecting the bypass pipe 80 and the first heat exchanger 40 to the second heat exchanger 60 is connected to a device to be conveyed in accordance with the setting of the supply of cold and hot water, A plurality of check valves 90 are formed as shown in FIG.

The auxiliary bypass pipe (81) is provided with an expansion valve (50). The refrigerant heat-exchanged through the third heat exchanger (30) is expanded through the expansion valve (50). At this time, the refrigerant expanded through the expansion valve (50) is transferred through the auxiliary bypass pipe (81) and transferred to the second heat exchanger (60).

1, the third heat exchanger 30 is provided between the first heat exchanger 40 and the expansion valve 50. When a part of the water to be transferred to the first heat exchanger 40 is subjected to the third heat exchange Exchanges heat with the refrigerant heat-exchanged in the first heat exchanger (40) to heat the water and convert the refrigerant to a low temperature.

Here, the third heat exchanger 30 is branched and connected to the pipe for transferring the water to the first heat exchanger 40, and the auxiliary pipe 70 is connected to the auxiliary pipe 70 through the first heat exchange A part of the water flowing into the unit 40 is transferred to the third heat exchanger 30 and then heated by the third heat exchanger 30 and then transferred to the place of use together with the heat exchanged water in the first heat exchanger 40 .

The third heat exchanger 30 is connected to the auxiliary bypass pipe 81 and exchanges heat between the water transferred through the auxiliary pipe 70 and the refrigerant heat-exchanged in the first heat exchanger 40.

Meanwhile, the process of the heat pump system described above is a process during heating or hot water supply, and the process of the system is reversed when cooling or cold water is supplied.

10: compressor 20: 4-way valve
30: third heat exchanger 40: first heat exchanger
50: expansion valve 60: second heat exchanger
70: auxiliary pipe 80: bypass pipe
81: auxiliary bypass pipe 90: check valve

Claims (3)

A compressor (10) for converting the refrigerant into high temperature and high pressure;
A 4-way valve (20) installed on the outlet side of the compressor (10) for selectively delivering the high temperature and high pressure refrigerant of the compressor (10) to various devices;
A first heat exchanger (40) connected to the 4-way valve (20) and heating the water by mutual heat exchange with the high temperature high pressure refrigerant of the compressor (10) and the water used;
An expansion valve (50) connected to the first heat exchanger (40) and expanding the heat exchanged refrigerant;
A second heat exchanger (60) connected between the expansion valve (50) and the 4-way valve (20) to heat the refrigerant expanded in the expansion valve (50) and the external geothermal heat to evaporate the refrigerant;
A part of the water used for transfer to the first heat exchanger 40 is transferred between the first heat exchanger 40 and the expansion valve 50 and is heat exchanged with the refrigerant heat exchanged in the first heat exchanger 40, And a third heat exchanger (30) for heating and converting the refrigerant to a low temperature,
A bypass pipe 80 is further formed so that the refrigerant heat-exchanged in the first heat exchanger 40 passes through the third heat exchanger 30 before being transferred to the second heat exchanger 60, A plurality of check valves 90 are formed so as to transfer the refrigerant to the third heat exchanger 30 and a separate auxiliary bypass pipe 81 is branched from the bypass pipe 80 to be connected to the third heat exchanger And the auxiliary bypass pipe (81) is connected to an expansion valve (50) for expanding the refrigerant heat-exchanged in the third heat exchanger (30).
The method according to claim 1,
In the third heat exchanger 30, a separate auxiliary pipe 70 is branched and connected to the pipe for transferring water to the first heat exchanger 40, and the auxiliary pipe 70 is connected to the first heat exchanger 40 is transferred to the third heat exchanger (30), and is then transferred to the place of use together with the heat-exchanged water in the first heat exchanger (40) after being heated. .
delete

Images