KR20160005602A - Cooling and heating system using ground source - Google Patents

Abstract

Provided is a cooling and heating system having a heat pump which exchanges heat using geothermal heat, and an indoor unit which cools and heats a place needing to be heated by receiving a refrigerant from the heat pump. The cooling and heating system using geothermal heat comprises a plurality of heat exchanging pipes laid underground at a predetermined depth from the ground and connected to the heat pump to discharge heat into the ground or to absorb geothermal heat from the ground, and an interval retaining unit which separates the plurality of heat exchanging pipes buried in a borehole at a certain interval apart from each other under the ground.

Description

{COOLING AND HEATING SYSTEM USING GROUND SOURCE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling / heating system using geothermal heat, and more particularly to a cooling / heating system using geothermal heat to improve heat exchange efficiency by embedding a plurality of heat exchange pipes in a borehole in the ground.

Generally, energy sources used for domestic and industrial heating and cooling include fossil fuels such as petroleum and natural gas, or nuclear fuel. The use of such energy sources not only causes the main cause of environmental pollution, but also has a limited amount of reserves. It is actively proceeding.

As energy sources used for heating and cooling, fossil fuels such as coal, oil, and natural gas are used, or energy produced by using these fossil fuels or nuclear power is mainly used.

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, a large area must be secured along with the limit of the installation site, and these devices have a small energy production capacity per unit unit and a large installation and maintenance cost.

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

The heating and cooling system using geothermal, 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 an underground heat exchanger so that heat is released to the ground during the summer season by the heat exchanger, By absorbing heat, the cooling and heating performance is not lowered due to the geothermal temperature maintained at a constant temperature from 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.

The conventional cooling and heating system using geothermal heat is composed of a heat exchange pipe for recovering geothermal heat and a heat pump for cooling and heating by moving the geothermal heat recovered from the heat exchange pipe to a required place.

In the cooling / heating system using the geothermal heat, a plurality of boreholes are drilled at a depth of 150-200 m or more in the soil layer at the land side, and the heat exchange pipe 20 is buried in the boreholes to supply the geothermal water.

The geothermal water supplied through the heat exchange pipe (20) is provided with a heat pump (30) for moving to a required customer (10) for cooling and heating.

The conventional geothermal cooling / heating system according to the present invention performs heat exchange with a geothermal heat source by supplying heat-exchanged refrigerant from geothermal heat maintained at a constant temperature through U-shaped heat exchange pipes buried in the ground, .

However, in the conventional cooling / heating system using geothermal heat, the heat exchange pipe is U-shaped and one heat exchange pipe is buried in one borehole, resulting in a problem of low heat exchange efficiency. Accordingly, there is a problem in that a larger number of boreholes must be drilled in order to increase the heat exchange efficiency, and there is a problem that the construction cost and period are increased accordingly.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to reduce the number of drilling holes in the ground and to improve the heat exchange performance of the heat exchange pipe by embedding a plurality of heat exchange pipes in one borehole The object of the present invention is to provide a cooling / heating system using geothermal heat.

According to an aspect of the present invention, there is provided a cooling and heating system including a heat pump for performing heat exchange using geothermal heat, and an indoor unit for cooling and heating a customer by receiving refrigerant from a heat pump, A plurality of heat exchange pipes connected to the pump and absorbing geothermal heat in the ground or discharging heat to the ground and a plurality of the heat exchange pipes buried in one bore are spaced apart from each other so as to maintain a constant spacing therebetween, Heating and cooling system using geothermal heat.

The gap maintaining portion may include a fastening member fastened to the outer circumferential surface of the heat exchange pipe and a support member connecting the fastening member fastened to the outer circumferential surface of another heat exchange pipe adjacent to the fastening member.

The support member may connect the heat exchange pipe with another heat exchange pipe that is closest to the side in the lateral direction so as to maintain the interval of the heat exchange pipe located at the same height.

The support member may connect the heat exchange pipes to the heat exchange pipes in a diagonal direction to maintain the interval of the heat exchange pipes at the same height.

The plurality of spacing portions may be coupled according to a setting depth.

The heat exchange pipe may include a guide piece protruding along the longitudinal direction at a portion where the outer circumferential surface of the heat exchange pipe contacts the inner circumferential surface of the borehole.

The geothermal heating / cooling system according to the present invention has the following effects.

A plurality of heat exchange pipes can be buried through one borehole to increase the heat exchange efficiency and the construction cost can be remarkably reduced and the construction period can be shortened as the number of times of construction of the borehole decreases.

FIG. 1 is a schematic view of a cooling / heating system using geothermal heat according to the present invention.
2 is an internal perspective view illustrating a heat exchange pipe of a cooling / heating system using geothermal according to a first embodiment of the present invention.
Fig. 3 is a plan view showing the heat exchange pipe shown in Fig. 2 from above. Fig.
4 is an internal perspective view illustrating a heat exchange pipe of a cooling / heating system using geothermal according to a second embodiment of the present invention.
Fig. 5 is a plan view showing the heat exchange pipe shown in Fig. 4 from above. Fig.
6 is an enlarged partial enlarged view of a part of the heat exchange pipe shown in Fig.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It should be noted that the drawings denoted by the same reference numerals in the drawings denote the same reference numerals whenever possible, in other drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. And certain features shown in the drawings are to be enlarged or reduced or simplified for ease of explanation, and the drawings and their components are not necessarily drawn to scale. However, those skilled in the art will readily understand these details.

FIG. 1 is a schematic view of a cooling / heating system using geothermal heat according to the present invention.

Referring to FIG. 1, the geothermal heating and cooling system according to the present invention includes a customer 110, a heat pump 120, a heat exchange pipe 130, and a heat storage tank 140 as main components.

Here, the customer 110 means a space in which a person or a domestic animal lives and lives with a certain area or volume, or a space occupied for a certain period of time such as a company or a government office.

The heat pump 120 is a well-known technique, which is not specifically shown and described, but includes an evaporator for evaporating the refrigerant, a compressor for compressing the refrigerant evaporated from the evaporator and discharging the refrigerant at high temperature and high pressure, A refrigeration cycle having a condenser and an expansion valve in which the discharged refrigerant flows and is condensed is operated.

That is, the heat pump 120 refers to a cooling / heating device that transfers a low-temperature heat source to a high temperature or transfers a high-temperature heat source to a low temperature by using heat or condensation heat of a refrigerant. The heat pump 120 includes an outdoor unit having a compressor and an outdoor heat exchanger, and an indoor unit including an expansion valve and an indoor heat exchanger.

The heat exchange pipe 130 is formed in a U-shape embedded in the ground and has a pump (not shown) inserted into the ground to circulate geothermal water to the heat pump 120 or the heat storage tank 140 .

The heat exchange pipe 130 is formed by drilling an earth surface at a depth of 100 to 150 M to form a borehole, and a heat exchange pipe 130 including a U-shaped inlet pipe and a water pipe is inserted into the borehole.

Meanwhile, among the U-shaped heat exchange pipes 130 constituting the heat exchange pipe 130, the diameters of the water inlet pipe and the water outlet pipe may be different, so that the flow rate of the geothermal water may be different.

For example, the diameter of the water inlet pipe used for cooling and heating in the customer 110 may be smaller than the diameter of the water outlet pipe to which geothermal water flows into the heat pump 120 or the heat storage tank 140 The flow rate of the geothermal water supplied to the heat pump 120 or the thermal storage tank 140 can be decreased to lower or raise the temperature of the geothermal water.

As the geothermal heat is circulated along the inside of the heat exchange pipe 130 by the pump, the heat exchange pipe 130 absorbs heat from the ground through heat exchange with the ground, thereby recovering the geothermal heat, or the heat pump 120 or the heat storage tank 140 ) Will supply geothermal water at a certain temperature (15 ~ 21 ℃).

For example, when the temperature of the geothermal water flowing from the heat exchange pipe 130 is 10 ° C, the thermal storage tank 140 increases the temperature of the geothermal water to 15 to 21 ° C by heating and supplies the geothermal water to the heat pump 120 When the temperature is 25 캜, the temperature is lowered to a temperature of 15 캜 to 21 캜 and then supplied to the heat pump 120.

And a plurality of radiating fins radially extending along inner and outer surfaces of the heat exchange pipe 130. The plurality of radiating fins expand the inner and outer surface areas of the heat exchange pipe 130 as much as possible, The heat exchange efficiency with the geothermal heat can be maximized.

The heat storage tank 140 stores geothermal water introduced from the heat exchange pipe 130 or stores geothermal water heat-exchanged by the heat pump 120. The heat storage pipe 140 is connected to the heat exchange pipe 130 And is connected to the heat pump 120.

The geothermal water flowing into the heat storage tank 140 through the heat exchange pipe 130 is heated or cooled to a predetermined temperature and supplied to the heat pump 120.

For example, when a temperature monitoring sensor (not shown) is attached to the thermal storage tank 140 and the temperature of the geothermal water introduced into the thermal storage tank 140 through the temperature detection sensor is less than 15 degrees, And discharges the geothermal water to 15 degrees or more. When the temperature is in the range of 15 to 30 degrees, the geothermal water is directly discharged without operating the thermal storage tank 140 and used for heating.

Accordingly, the temperature of the geothermal water supplied from the heat exchange pipe 130 to the thermal storage tank 140 is compensated to 15 to 21 ° C and supplied to the heat pump 120, thereby reducing the operation time of the heat pump 120, It is possible to optimize the cooling / heating efficiency.

Here, the thermal storage tank 140 measures the temperature of the geothermal water flowing into the ground, and when the geothermal water temperature is lower or higher than the set value, the temperature of the geothermal water is compensated to the temperature of 15 to 21 ° C through heating or cooling To the heat pump (120).

At this time, the thermal storage tank 140 normally uses the power supplied from a photovoltaic power generation device (not shown), but when the photovoltaic power generation device does not generate electricity, the stored power or electric power system The supplied power source is used.

In addition, the thermal storage tank 140 can reduce power consumption by itself generating and using electric power through solar power generation during the day when solar power generation is possible, and when installed in a place such as a government office that works five days a week, It is operated as surplus energy of PV power generated from photovoltaic power generation system or general grid electricity, and energy can be saved by using stored energy.

The photovoltaic device generates direct current electricity from a solar cell array that receives sunlight and converts the direct current electricity into an alternating current electricity through an inverter. The alternating current electricity converted through the inverter is supplied to a power system So that the power can be selectively used.

If the heat storage tank 140 does not operate, the electric energy generated from the solar power generator is charged into an energy storage device (not shown) and used as needed.

The heat pump 120 and the heat storage tank 140 are configured to communicate with each other to maintain the geothermal water at 15 to 21 ° C. The heat storage tank 140 is an additional element in the embodiment of the present invention and can be omitted as necessary and supplied to the heat pump 120 or the thermal storage tank 140 through the heat exchange pipe 130 have.

In addition, according to the present invention, the operation cost of the heat pump 120 can be reduced by allowing the heat pump 120 to operate according to the set temperature of the heat storage tank 140.

In addition, the present invention uses electric energy directly through solar power generation using natural solar energy as an operating energy source, and when the solar power generation is not performed, the electric power source is directly supplied from the electric power system of KEPCO. When the cooling / heating system is not operated, the electric energy generated through the solar power generation is stored in a separate energy storage device and is used as an energy source when necessary, so that power consumption can be minimized.

Also, since the heat exchange efficiency is increased, the depth of the borehole can be reduced when the borehole is drilled.

[First Embodiment]

2 is an internal perspective view showing a heat exchange pipe 130 of a cooling / heating system 200 using geothermal according to the first embodiment of the present invention, and FIG. 3 is a top view of the heat exchange pipe 130 shown in FIG. 2 FIG.

2 and 3, the geothermal cooling / heating system 200 according to the first embodiment of the present invention is embedded at a predetermined depth from the ground, connected to the heat pump, absorbs geothermal heat in the ground, A plurality of heat exchange pipes 130 for discharging and a plurality of heat exchange pipes 130 embedded in one of the boreholes H are spaced apart from each other by a predetermined distance in the ground.

The heat exchange pipes 130 are disposed adjacent to the inner circumferential surface of the borehole and are spaced apart from each other at equal intervals. Then, the heat exchange pipe 130 is provided with a plurality of heat exchange pipes in one borehole, so that heat exchange efficiency is remarkably increased.

The gap holding part 230 may include a fastening member 231 fastened to the outer circumferential surface of the heat exchange pipe 130 and a fastening member 231 fastened to the outer circumferential surface of another heat exchange pipe adjacent to the fastening member 231 (Not shown).

The fastening members 231 may be detachably coupled to the outer circumferential surface of the heat exchange pipe 130 and may be coupled to the heat exchange pipe 130 at predetermined intervals along the longitudinal direction of the heat exchange pipe 130.

Also, another fastening member 231 is coupled to the outer circumferential surface of the heat exchange pipe adjacent to the heat exchange pipe 130 in correspondence with the same height as the fastening member 231, and is connected by the support member 232.

The support member 232 connects the heat exchange pipe 130 with another heat exchange pipe that is closest to the side and provides the function of maintaining the interval of the heat exchange pipe 130 located at the same height.

At this time, the support member 232 connects the plurality of coupling members 231 coupled on the outer circumferential surface of each heat exchange pipe 130 to maintain the interval between the heat exchange pipes 130, Thereby facilitating the installation of the heat exchange pipes 130.

[Second Embodiment]

4 is an internal perspective view showing a heat exchange pipe 130 of a cooling / heating system 300 using geothermal according to a second embodiment of the present invention, and FIG. 5 is a top view of the heat exchange pipe 130 shown in FIG. And FIG. 6 is an enlarged view of a part of the heat exchange pipe 130 shown in FIG.

4 to 6, the cooling / heating system 300 using geothermal according to the second embodiment of the present invention is different from the coupling structure of the supporting member 332 in the gap holding part 330. [

Unlike the first embodiment, in the second embodiment, the heat exchanging pipes 130 and the other heat exchanging pipes located in the diagonal direction are connected to each other by the supporting member 332.

In this case, the material cost can be reduced because the number of the support members 332 is reduced compared with the first embodiment. Further, since the interval maintaining part 330 is disposed at the center of the heat exchange pipes 130, Can be prevented from being bent in the center direction in which the distance from each other is close to each other.

Therefore, the support member 332 is advantageous in that the heat exchange pipes 130 located at the same height can be maintained by connecting other heat exchange pipes located diagonally to the heat exchange pipe 130 with each other.

The plurality of spacers 330 are coupled to each other in consideration of a safety factor according to a depth set in the borehole H,

Referring to FIG. 6, the heat exchange pipe 130 includes guide pieces 340 protruding in the longitudinal direction.

The guide piece 340 protrudes along the longitudinal direction of the heat exchange pipe 130 at a portion where the outer circumferential surface of the heat exchange pipe 130 is in contact with the inner circumferential surface of the borehole to reduce frictional force with the inner circumferential surface of the borehole, It provides the function to increase.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, . ≪ / RTI > Accordingly, such modifications are deemed to be within the scope of the present invention, and the scope of the present invention should be determined by the following claims.

200,300: Heating and cooling system using geothermal
110: customer demand 120: heat pump
130: Heat exchange pipe 140: Heat storage tank
230, 330: space holding portion 231: fastening member
232,332: Supporting member borehole: H

Claims (6)

1. A cooling / heating system using geothermal heat, comprising a heat pump for performing heat exchange using geothermal heat, and an indoor unit for cooling and heating a customer with cooling water supplied from a heat pump,
A plurality of heat exchange pipes embedded at a predetermined depth from the ground to be connected to the heat pump and absorbing geothermal heat in the ground or emitting heat to the ground;
A spacing maintaining unit for spacing the plurality of heat exchange pipes embedded in one borehole so as to maintain a predetermined interval in the ground;
Wherein the heating and cooling system uses geothermal heat. The method according to claim 1,
The space-
A fastening member fastened to an outer circumferential surface of the heat exchange pipe,
And a supporting member for connecting a fastening member fastened to an outer circumferential surface of another heat exchange pipe adjacent to the fastening member. The method of claim 2,
Wherein the support member comprises:
Wherein the heat exchange pipe and the other heat exchange pipe closest to the side are connected to each other to maintain the interval of the heat exchange pipe at the same height. The method of claim 2,
Wherein the support member comprises:
Wherein the heat exchange pipe and the other heat exchange pipes located in a diagonal direction are connected to each other to maintain the interval of the heat exchange pipe at the same height. The method according to claim 1,
Wherein a plurality of the gap holding portions are coupled according to a set depth. The method according to claim 1,
The heat exchange pipe
And a guide piece protruding along the longitudinal direction at a portion where the outer circumferential surface of the heat exchange pipe contacts the inner circumferential surface of the borehole.

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