KR100895292B1 - An inter-connected geo-thermal hole for preventing effluence of underground water - Google Patents

Abstract

The present invention relates to a geothermal heat exchanger having a groundwater leakage prevention function of groundwater, and when groundwater is supplied from a plurality of geothermal holes to be heat-exchanged, even if the groundwater utilization and storage capacity of each geothermal hole are different, By allowing the groundwater to flow into the ground, the groundwater does not overflow to the ground even if the valve is not manipulated one by one, and a plurality of geothermal holes formed in the ground and an outer diameter smaller than the inner diameter of the geothermal hole are formed in the inlet hole at the bottom A return pipe communicating with the return portion and an underwater pump for pumping the groundwater of the return portion through the inlet hole, respectively, mounted in the pump pipe and inserted into the center of the geothermal holes so that a return portion is formed in the portion. Circulating ground water continuously through the pumping pipe and return pipe Ground water circulation means; Heat exchange means connected to the pump pipe and the return pipe through a manifold to receive ground water and heat exchange; Both ends are connected to each of the return portion of the plurality of geothermal holes in fluid communication to guide the flow of groundwater in the return portion includes a level control pipe to maintain a constant level of the geothermal holes.

Geothermal, Heat Exchanger, Pump Pipe, Water Level Control Pipe

Description

Geothermal air heat exchanger with groundwater prevention function of groundwater {AN INTER-CONNECTED GEO-THERMAL HOLE FOR PREVENTING EFFLUENCE OF UNDERGROUND WATER}

1 is a block diagram showing a geothermal air heat exchanger having a function of preventing the ground outflow of groundwater according to the present invention.

Figure 2 is an enlarged view of the geothermal air heat exchanger having a function of preventing the ground outflow of groundwater according to the present invention.

Figure 3 and Figure 4 is a pipe joint structure diagram of the pump pipe applied to the geothermal heat exchanger having a groundwater leakage prevention function of each ground according to the present invention.

<Description of the major signs used in the drawings>

10: groundwater circulation means, 11A: geothermal air

12A: pumping pipe, 13: return part

14: submersible pump, 15A: return pipe

16A: Casing, 17: Coupler

18: diameter part, 20: heat exchange means

30,40: manifold,

The present invention relates to a geothermal air heat exchanger having a groundwater leakage prevention function of groundwater, and more particularly, the groundwater utilization and storage capacity of each geothermal hole when groundwater is supplied from a plurality of geothermal holes formed in the ground. Even though it is different, it is possible to allow groundwater to flow between geothermal cooperatives so that the groundwater does not overflow to the ground, and it is connected to each other in the heat exchange process so that the heat exchange is carried out through the entire geothermal hole to maximize the efficiency. It relates to a heat exchange device.

Most commonly used energy sources are fossil fuels such as coal, petroleum, and natural gas, or nuclear fuels.

However, fossil fuels pollute the environment due to various pollutants generated during the combustion process, and nuclear fuels generate harmful substances such as water pollution and radioactivity, and these energy sources have a limited amount of reserves.

Therefore, in recent years, the development of alternative energy to replace this has been actively progressed.

Among these alternative energy, researches on natural energy such as wind, solar, geothermal, etc. have been conducted for a long time and practically installed and used air-conditioning and heating system. These natural energies have almost no influence on environmental pollution and climate change. While there is an advantage in obtaining energy, it is a key factor in the development of natural energy technology to increase the density and convert it into a usable form due to the drawback of very low energy density.

One of such natural energy technologies is known as a heat pump system that performs cooling and heating using geothermal heat as a heat source. Heat pump system using geothermal heat is a technology that uses heat exchanger to install heat exchanger to recover heat in the ground of 10 ~ 20 ℃ or discharge heat into the ground.

In general, as a heat source of a heat pump, an air heat source method of obtaining or discharging heat in the air, such as an air conditioner, and a water heat source method of discharging heat through a cooling tower are used. The use of geothermal sources has the advantage that the energy efficiency is very high compared to air heat sources.

In particular, the year-round air temperature in the areas where the four seasons are obviously changed greatly varies from -20 to 40 ℃, while the underground temperature is almost constant at 10-20 ℃ during the year below 5m underground.

Therefore, in the case of cooling in summer, the air heat source temperature is consumed a lot of power to discharge the cooling heat to 30 ℃ or more, while the geothermal heat source is smoothly discharged to 10 ~ 20 ℃ shows a high efficiency. On the contrary, in the case of heating in winter, the air heat source is difficult to supply the heat necessary for heating at the lowest temperature of -20 ° C, while the underground heat source is 10 to 20 ° C, which can stably supply the heating heat to the heat pump.

The geothermal heat pump system is known to have the highest energy efficiency among all air-conditioning technologies. Therefore, it is an essential technology in a situation where energy resources are scarce and energy costs are high.

Another advantage of heat pump systems using geothermal sources is that they can store cooling or heating heat underground. In other words, the soil or rock in the ground has a low thermal conductivity, so the heat is not easily diffused and stored. Therefore, when heat is released into the ground due to summer cooling, the heat is stored in the ground without disappearing.

On the other hand, the geothermal heat exchanger has a method of allowing the heat exchange medium to circulate underground and supplying ground water to the heat exchanger to heat exchange with the heat exchange medium.

As is well known, groundwater [地下水; ground water is water that fills or runs through gaps between underground strata and rocks. geothermy] refers to the amount of heat released from the inside of the earth to the outside through the surface. Geothermal heat is emitted from the entire surface of the earth to the outside. Higher value in the zone. The outflow methods are based on heat conduction, gas, hot water and volcanic eruptions. Geothermal energy is often used for power generation in places where there is a large amount of crustal heat, such as New Zealand, Italy and Japan. Geothermal heat is also based on the thermal energy generated by the natural collapse of radioactive materials in the earth's crust. On the other hand, heat is hardly released to the surface because the mantle is thermally insulated in the hot earth, where iron and nickel are melted. Appropriate use of the geothermal heat is quite advantageous in terms of environment. There are no carbon dioxide emissions and few pollutants. And geothermal heat can be used in many forms, including direct heating, power generation, heating and cooling through heat pumps, and heat for manufacturing.

Referring to the geothermal heat exchanger using groundwater schematically, it is largely composed of groundwater circulation means and heat exchange means. Groundwater circulation means is a geothermal hole formed in the ground, a pumping pipe inserted into the geothermal hole, the submersible pump installed in the interior of the pumping pipe pumps the groundwater in the geothermal hole to supply to the heat exchange means, the heat exchange means It is configured to include a return pipe for returning the ground water heat exchanged through the geothermal hole again.

On the other hand, in the geothermal heat exchanger having such a structure, a plurality of groundwater circulation means is connected to one heat exchange means.

However, the geothermal heat exchanger according to the prior art has the following problems.

A plurality of groundwater circulation means connected to one heat exchange means is formed in the ground so that each geothermal hole is close to each other, but the groundwater use and storage capacity may be different depending on the development of subsurface soil and aquifer. However, since the pumping and returning amount of groundwater is the same in all geothermal holes, more water can be replenished than its own storage capacity, which causes the groundwater in the geothermal hole to overflow into the ground through the geothermal hole inlet as the level rises. On the contrary, if the amount less than its storage capacity is replenished, the water level drop causes idle motor pump idling, causing a failure and a phenomenon in which the heat exchange capacity is significantly reduced.

In order to prevent this phenomenon, each of the pumping pipe and the return pipe is used to install a valve, the operator has to operate the valve by hand to adjust the amount of return of the groundwater is very inconvenient management.

In addition, when only some geothermal holes of the plurality of geothermal holes are used to close the unused geothermal holes through the valve operation every time, and the management of the return of the groundwater through the valve of the remaining geothermal holes is also very inconvenient management.

The present invention has been made to solve the problems as described above, it is perforated in the ground and connected to one heat exchange means to maintain a constant level in a plurality of geothermal holes for supplying groundwater without a separate valve operation It is an object of the present invention to provide a geothermal air heat exchanger that has a function of preventing groundwater outflow of groundwater to improve the heat exchange capacity.

Geothermal air heat exchanger having a groundwater leakage prevention function of groundwater according to the present invention for achieving the above object, a pump for supplying a plurality of geothermal holes and groundwater in the geothermal hole, perforated in the ground, receiving groundwater from the pump Heat exchange means for heat exchange, a return pipe for returning the ground water heat exchanged through the heat exchange means to the geothermal hole, by connecting the geothermal holes to each other to allow the groundwater in the geothermal holes to flow to each other to maintain a constant water level in the geothermal holes It characterized in that it comprises a level control means for maintaining.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. Prior to this, the terms or words used in the present specification and claims are based on the principle that the inventor can appropriately define the concept of the term in order to explain the invention in the best way. It should be interpreted as meanings and concepts corresponding to

As shown in FIG. 1, the geothermal air heat exchanger having a groundwater leakage prevention function of groundwater according to the present invention includes a plurality of geothermal holes 11A and 11B formed in the ground (G). And groundwater circulated after receiving heat exchange from groundwater circulation means (10A, 10B, 10C) and groundwater circulation means (10A, 10B, 10C) for circulating groundwater in the groundwater. Heat exchange means 20 for returning back to the means 10A, 10B, 10C, and level control tubes 50A, 50B for adjusting the level of the groundwater circulation means 10A, 10B, 10C. Hereinafter, each component is demonstrated concretely.

Groundwater circulation means (10A, 10B, 10C) is the same structure, only the installation position is different, so only one will be described as an example.

As shown in FIG. 2, the groundwater circulation means has an outer diameter smaller than the inner diameter of the geothermal hole 11A and the geothermal hole 11A formed in the ground G, and an inlet hole 12 is formed at the lower end to return to the circumference. Inserted into the center of the geothermal hole (11A) so that the portion 13 is formed, respectively connected to the heat exchange means 20 and is mounted in the interior of the pumping pipe (12A), the pumping pipe (12A) for supplying ground water 12, a submersible pump 14 for pumping the groundwater in the return portion 13, the return portion 13 and the heat exchange means 20 is connected to guide the return of the groundwater heat exchanged by the heat exchange means 20 It consists of a tube 15A. Here, the lower inlet 12 of the pump pipe 12A is close to the bottom of the geothermal hole 11A and the outlet of the return tube 15A is disposed at the inlet side of the geothermal hole 11A to return 15A. The groundwater discharged from the heat exchanged downwards toward the inlet 12 is supplied to the pumping pipe 12A again.

As shown in FIG. 1, the heat exchange means 20 is connected to the pumping pipes 12A, 12B, 12C and the return pipes 15A, 15B, and 15C of the groundwater circulation means 10A, 10B, and 10C. 12B, 12C) through the ground water is supplied to the heat exchange medium and the ground water heat exchange, and the same as the conventional heat exchange means will be omitted here a detailed description.

Since a plurality of groundwater circulation means (10A, 10B, 10C) is connected to one heat exchange means 20, the supply side for collecting a plurality of lines of pumping pipes (12A, 12B, 12C) and return pipes (15A, 15B, 15C) The manifold 30 and the discharge side manifold 40 are provided, respectively.

The supply-side manifold 30 and the discharge-side manifold 40, like the heat exchange means 20, are not related to the technical gist of the present invention, and thus the same description as the conventional one is omitted.

The present invention is characterized in that even if the amount of groundwater in the plurality of geothermal holes (11A, 11B, 11C) is different, the groundwater level (amount) of each geothermal hole is kept constant, for example, the water level control pipe (50A) 50B) (In the present invention, since three geothermal holes 11A, 11B, and 11C have been described, only two water level control tubes 50A and 50B are shown).

The water level control pipes 50A and 50B are buried between the geothermal holes 11A, 11B and 11C so that both ends thereof return portions 13 of the geothermal holes 11A, 11B and 11C having different ends (see FIG. 2). The pipe is connected in fluid communication. That is, geothermal holes (11A, 11B, 11C) of different groundwater circulation means (10A, 10B, 10C) is connected through the water level control pipe (50A, 50B) geothermal holes 11A, 11B, 11C).

Water level control pipe (50A, 50B) is piped to tubular casing (16A, 16B, 16C) provided on the inner peripheral surface of the inlet side of geothermal hole (11A, 11B, 11C), respectively. For example, at the periphery of the casing 16A, a pipe joint 16D (one or two pipe joints are formed depending on the quantity of the water level control tubes 50A and 50B) is formed to protrude, and the water level control tube 50A is formed. Is a diameter larger than that of the pipe joint 16D and is fitted to the pipe joint 16D with an index ring or the like interposed therebetween.

However, in order for the groundwater to flow by the water level control pipes 50A and 50B, even if the geothermal holes 11A, 11B and 11C have different heights, the water level control pipes should be formed to be horizontal.

In the drawings, reference numerals V1 and V2 denote valves.

Referring to the operation of the geothermal air communication structure having a groundwater leakage prevention function of groundwater according to the present invention configured as described above are as follows.

Groundwater in the ground (G) flows into the return portion 13 (see FIG. 2) of the geothermal holes 11A, 11B, and 11C of each groundwater circulation means 10A, 10B, and 10C. Submersible pumps 14A, 14B, 14C in each geothermal hole 11A, 11B, 11C are groundwater present in return portion 13 (see FIG. 2) through pumping pipes 11A, 11B, 11C. Pump each to supply to the supply side manifold 30, and the ground water collected through the supply side manifold 30 is supplied to the heat exchange means 20 and heat exchanged with the heat exchange medium of the heat exchange means 20, and then the discharge side manifold ( 40 is branched to a plurality of return pipes 15A, 15B and 15C, and groundwater returned back to the respective return pipes 15A, 15B and 15C flows through geothermal holes 11A, 11B and 11C. The heat exchanger is then supplied to the pumping pipes 12A, 12B, and 12C again.

As such, each of the geothermal holes 11A, 11B, and 11C while ground water is supplied to and returned to the heat exchange means 20 may have different use capacity and storage capacity of the groundwater, and thus, the return pipes 15A, 15B, and 15C may be used. If a uniform amount is filled, the storage capacity may be exceeded at some point. In this case, groundwater is introduced into the other geothermal holes 11A, 11B, and 11C through the water level control pipes 50A and 50B. For example, when the groundwater above the storage capacity is filled in the first geothermal hole 11A, the groundwater flows to the second geothermal hole 11B through the first water level control pipe 50A without overflowing to the ground outside the ground G. On the contrary, if the groundwater above the storage capacity is filled in the second geothermal hole (11B), the groundwater is the first geothermal hole (11A) or the first through the first water level control pipe (50A) or the second water level control pipe (50B) It flows into 3 geothermal holes 11C. Therefore, while the groundwater above the storage capacity is supplied to other geothermal holes, the groundwater level in all geothermal holes 11A, 11B, and 11C can be constantly adjusted according to the capacity of each geothermal hole.

On the other hand, geothermal air heat exchanger having a groundwater leakage prevention function of the groundwater according to the present invention, the pumping pipe 12 is a plurality of unit pipes (12-1, 12-2) are piped, insertion and withdrawal is smooth And it is configured so that the pipe joint of the pump 12 is not broken, and as shown in Figure 3, the unit pipes (12-1, 12-2) are inclined guides (17a, 17b) in the upper and lower ends of the outer peripheral surface, respectively Is piped through the coupler 17 is provided. The coupler 17 may be fastened to the unit tubes 12-1 and 12-2 by an adhesive or a screw 17c. According to this configuration, even when the coupler 17 is larger than the pumping tube 12 when the pumping tube 12 is drawn out or inserted, the inclined guides 17a and 17b pass through the inner wall surface of the geothermal hole by sliding. No breakage of pipe joint occurs.

And, as shown in Figure 4, the upper end of the unit pipe 12-2 is formed with an enlarged diameter portion 18 that gradually increases the inner diameter toward the end, the inclined guide 18a is formed at the upper circumference of the enlarged diameter portion 18 It is provided, and the lower end part of the upper unit pipe 12-1 is fitted to the enlarged diameter part 18 of the lower unit pipe 12-2, and is engaged. In order to increase the unity of the unit pipes (12-1, 12-2) may be further fastened to the joint with an adhesive or screw.

Therefore, when the amniotic tube 12 is inserted, the enlarged diameter portion 18 slides along the inner wall surface of the geothermal hole so that the pipe joint portion is held, and the pipe joint portion is pulled out by the inclined guide 18a. It is withdrawn while sliding.

As described above, according to the present invention, when groundwater is supplied and heat-exchanged from a plurality of geothermal holes formed in the ground, even if the groundwater utilization capacity and storage capacity of each geothermal hole are different, the valve is allowed to flow by allowing the groundwater between geothermal holes to flow. Even if not operated one by one, groundwater does not overflow to the ground can be very easy to manage, and there is an effect that can maximize the efficiency of heat exchange.

While the invention has been described and illustrated in connection with a preferred embodiment for illustrating the principles of the invention, the invention is not limited to the configuration and operation as such is shown and described. Rather, those skilled in the art will appreciate that many modifications and variations of the present invention are possible without departing from the spirit and scope of the appended claims. Accordingly, all such appropriate changes, modifications, and equivalents should be considered to be within the scope of the present invention.

Claims (4)

It consists of a plurality of geothermal holes formed in the ground and the outer diameter smaller than the inner diameter of the geothermal hole while the inlet hole is formed in the lower portion is mounted in the center of the pump and the pump is inserted into the center of the geothermal hole so that the return portion is formed in the periphery, respectively A groundwater circulation means comprising a submersible pump for pumping the groundwater of the return portion through the inlet hole and a return pipe communicating with the return portion to continuously circulate the groundwater through the pumping pipe and the return pipe; Ground water supply is connected to the pumping pipes and return pipes of the groundwater circulation means, respectively, and collects the ground water supplied by the pumping pipes to exchange heat with the heat exchange means. And discharge side manifolds; And In order to guide the flow of groundwater in the geothermal hole to maintain the level of the groundwater in the geothermal holes, between the plurality of geothermal holes, both end portions of the level control pipe connected to each other in fluid communication to the return portion Geothermal heat exchanger having a function of preventing the ground outflow of groundwater, including. The ground of the groundwater according to claim 1, wherein a casing provided with a pipe fitting is installed on an inner wall of the inlet of the geothermal hole, and the water level control pipe has both ends connected to the pipe joint of the casing. Geothermal air heat exchanger having a leak prevention function. The pump according to claim 1 or 2, wherein the pumping pipe of the groundwater circulation means is a plurality of unit pipes, the unit pipes are piped through a coupler having an inclined guide in the upper and lower ends, respectively. Geothermal air heat exchanger having a groundwater leakage prevention function of groundwater. According to claim 1 or 2, wherein the pumping pipe of the groundwater circulation means is a plurality of unit pipes are pipe, the unit pipe is gradually increased in the inner diameter toward the upper end of the upper and lower both ends of the upper end portion at the upper periphery Geothermal hole heat exchanger having a ground-floor prevention function of groundwater, characterized in that the enlarged diameter portion provided with an inclined guide is formed, and the lower end portion of the other unit pipe is inserted into the enlarged diameter portion so that the pipe is connected by fastening with an adhesive or a screw. Device.

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