KR100670082B1 - Heat pump system using ground water - Google Patents

Abstract

A heat pump system using a ground water is provided to increase heat exchange efficiency of the heat pump system by providing a blocking layer to prevent the ground water from flowing from a ground to an inflow end of a pumping pipe. In a heat pump system using ground water, a well(20) is formed under ground to receive the ground water. A pumping pipe(12) has an inflow end and supplies the ground water in the well to a heat pump(10). A feeding pipe(14) has a discharging end at a position higher than the inflow end of the pumping pipe and feeds back the ground water discharged from the heat pump to the well. A blocking layer(30) is provided in the well at a place between the inflow end of the pumping pipe and the discharging end of the feeding pipe. And, the blocking layer plays a role of preventing the ground water discharged through the discharging end of the feeding pipe from flowing into the inflow end of the pumping pipe.

Description

Heat pump system using groundwater {HEAT PUMP SYSTEM USING GROUND WATER}

1 is a schematic view showing a heat pump system using a conventional groundwater,

2 is a schematic view showing a heat pump system using groundwater according to the first embodiment of the present invention;

Figure 3a is an enlarged side view showing a blocking film when installing the pumping pipe of the heat pump system of FIG.

Figure 3b is an enlarged side view showing a deformation state of the blocking film during the operation of the heat pump system of FIG.

Figure 4a is an enlarged side view showing a deformation state of the barrier film when installing the pump pipe of the heat pump system according to the second embodiment of the present invention,

Figure 4b is an enlarged side view showing the deformation state of the blocking film during the operation of the heat pump system according to the second embodiment of the present invention,

5 is a partially enlarged side view of the heat pump system according to the third embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10: heat pump

12: pumping pipe

14: Return pipe

16: submersible pump

20: creampie

30,40,50: barrier

The present invention relates to a heat pump system, and more particularly, to a heat pump system using groundwater, which simplifies construction by integrating existing water wells and injection wells into a single well.

Recently, development of alternative energy has been actively promoted throughout the industry, and research on natural energy such as wind, solar, and geothermal energy has been underway for a long time. One of the technologies using the natural energy is a heat pump system for cooling and heating by using geothermal heat as a heat source, which is a technology for cooling and heating by installing a heat exchanger to recover the heat of the ground or to discharge the heat into the ground.

Geothermal source exists in the ground, and underground temperature is almost constant at 10 ~ 20 ℃ during the year below 5m underground, and this temperature range is very suitable as a heat source of heat pump for cooling and heating. It has the advantage of high energy efficiency. That is, in the case of cooling in summer, the air heat source temperature is difficult to discharge the cooling heat above 30 ℃, while the ground heat source is low to 10 ~ 20 ℃ to exhibit a high efficiency by smoothly discharging the heat. On the contrary, in the case of winter heating, the air heat source is difficult to supply heat required for heating at a temperature of at least -20 ° C., while the underground heat source is high at 10-20 ° C., thereby stably supplying heating heat to the heat pump.

The geothermal heat pump system has been the most popular way to embed a closed loop heat exchanger in the ground vertically or horizontally. However, such a system uses a non-moving soil, unlike a flowing fluid, so that the heat transfer depends only on conduction, so that the heat resistance of the heat exchanger is large and a heat exchanger having a large heat transfer area is required. In order to solve this problem, a heat pump system using groundwater as disclosed in Korean Patent Laid-Open No. 10-2005-41611 has been developed, and this system is grounded through a water pipe 6 as shown in FIG. Intake well (2) for supplying groundwater to the heat pump (1) located in and the injection well (4) for returning the groundwater after the heat exchange through the return pipe (8) through the heat pump (1) These water extraction wells 2 and injection wells 4 are formed by drilling deep wells from the ground in a substantially vertical direction. However, since the intake well (2) and the injection well (4) to be drilled separately from each other there is a disadvantage that the construction time and the initial investment costs are high.

The present invention is to solve the problems of the prior art, an object of the present invention is to integrate a conventional water well and injection well into a single well to simplify the construction but heat exchange system using a groundwater that can increase the heat exchange efficiency To provide.

Heat pump system using groundwater according to the present invention for achieving the above object is a heat pump; A well drilled underground and receiving groundwater; A pumping pipe having an inflow end for supplying groundwater in the well to a heat pump; A return pipe having a discharge end at a position higher than an inflow end of the pumping pipe, for returning groundwater discharged from the heat pump into the well; It is provided in the interior at the point between the inlet end of the pump and the discharge end of the return pipe, and consists of a barrier for preventing the groundwater discharged through the discharge end of the return pipe flows directly to the inlet end of the pump.

According to one embodiment of the invention, the blocking membrane is formed such that a portion thereof is expandable to the positive side wall by the pressure of the groundwater flowing along the pump pipe.

Preferably, the barrier film surrounds a longitudinal portion of the pumping pipe, and a hole is formed in the side wall of the pumping pipe surrounded by the barrier film so that a part of the groundwater flowing along the pumping pipe presses the inner surface of the barrier film through the hole.

According to another embodiment of the present invention, the blocking film includes a rigid fixing plate coupled to the outer surface of the pumping pipe, and a flexible deformation plate extending inclined upwardly to the positive sidewall along the edge of the fixing plate.

According to another embodiment of the present invention, the chimney is formed by drilling into the ground from the ground and the bottom of the return pipe is located, the bottom of the upper portion is formed by drilling into the ground with a cross section smaller than the upper layer and the inflow of the pump It includes a lower layer where the stage is located, the barrier film is placed on the bottom surface of the upper layer and partitions the upper layer and the lower layer.

Preferably, the barrier film is plate-shaped and bonded to the outer surface of the pump.

More preferably, the edge of the barrier film is spaced apart from the side wall of the upper layer portion.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

2 is a schematic view showing a heat pump system using groundwater according to the first embodiment of the present invention.

As shown, the groundwater (w) is accumulated in the well (20) by drilling the well (20) in a substantially vertical direction using drilling equipment or the like from the ground. The deeper the depth of the well 20, the more geothermal energy can be obtained. An underwater pump 16 for pumping groundwater w is disposed near the bottom of the well 20, and the underwater pump 16 is connected to the inlet 12a of the pumping pipe 12 to allow the underwater pump 16 to flow. By the pumping action of the groundwater (w) is supplied to the heat pump 10 located on the ground through the pump pipe (12). Return pipe 14 for returning the groundwater, which has undergone heat exchange while passing through the heat pump 10 back to the well 20, extends from the heat pump 10 and its discharge stage 14a is the groundwater water in the well 20. It is installed to be located near the surface.

The heat pump 10 is a mechanical device used for cooling, heating, and hot water by raising low temperature, low density thermal energy to a usable high temperature, high density heat energy state by converting low temperature to high temperature or converting high temperature to low temperature, which is difficult to use directly. It operates in a cycle that compresses, condenses, expands, and evaporates heat-sensitive refrigerants. When the high-temperature and high-pressure gas refrigerant compressed in the compressor passes through the condenser, the exchanged high-temperature state is used for heating and hot water supply, and the low-temperature state is reduced by taking heat from the evaporator. As a system for cooling the air, a conventionally used one can be applied.

After the heat exchange from the heat pump 10 is completed, the groundwater returned to the well 20 is not absorbed into the strata, but descends along the side wall 20a of the well 20 and is directly heated by the submersible pump 16. When the water is taken in, the heat exchange between the groundwater and the ground is performed only through the side wall 20a of the well 20. Therefore, in order to satisfy the heat transfer required by the heat pump system, the depth of the well 20 must be dug deeper or the cross-sectional area must be larger. You have a problem. In order to solve this problem, the present invention provides a flow of groundwater (w) between the discharge end 14a of the return pipe 14 and the inlet end 12a of the pump pipe 12 (approximately the middle portion of the well 20). It characterized in that it comprises a blocking film 30 to prevent.

Figure 3a is an enlarged side view showing a blocking film when installing the pumping pipe of the heat pump system of Figure 2, Figure 3b is an enlarged side view showing a deformation state of the blocking film when the heat pump system of Figure 2 operates.

Blocking film 30 is made of a material having flexibility and elasticity surrounding a part of the longitudinal direction of the pumping tube 12, in particular the upper end 32 and the lower end 34 is in close contact with the outer surface of the pumping tube 12, the middle The part 36 is provided to allow expansion and contraction by the change in the pressure of the groundwater w. At least one communication hole 13 is formed in the side wall of the pumping pipe 12 surrounded by the blocking film 30. Preferably, the communication hole 13 is formed in a slot shape formed long along the longitudinal direction of the pumping pipe 12, and is constantly arranged along the circumference of the pumping pipe 12.

In detail, when the submersible pump 16 is introduced into the well 20 while the water pump 16 is in an inactive state, as shown in FIG. 3A, the upper end 32 and the lower end ( 34 is in close contact with the outer surface of the amniotic tube 12 and the intermediate portion 36 remains in a contracted state, so that the intermediate portion 36 of the barrier film 30 is in contact with the side wall 20a of the tablet 20. Without being able to install the pumping pipe 12 easily.

After all construction of the heat pump system is completed, when the submersible pump 16 starts to operate, the groundwater w in the well 20 is moved up and down along the pump pipe 12 by the pumping action of the submersible pump 16. It is supplied to the heat pump 10 side. At this time, some of the groundwater moving along the pumping pipe 12 flows to the inner surface side of the blocking film 30 through the communication hole 13 so that the middle portion 36 of the blocking film 30 expands to It comes in close contact with the side wall 20a. As a result, a relatively high pressure is formed inside the blocking film 30 than the surroundings of the blocking film 30 by the pumping action of the submersible pump 16, that is, the return pipe 14 (see FIG. 2). The groundwater located near the discharge end 14a of the barrier film 30 is prevented from flowing to the lower side of the barrier membrane 30, that is, the inlet end 12a side of the pump pipe 12. Therefore, the groundwater that is heat-exchanged through the heat pump 10 and then returned to the well 20 through the return pipe 14 is absorbed into the strata and is heat-exchanged with the ground while passing through the strata. It flows into the lower part of the blocking film 30, and this groundwater flow is performed repeatedly.

After heat exchanged with the ground, the thermal energy of the groundwater is supplied to the heat pump 10, and then converted into high density heat energy in the heat pump 10 to be used for heating and hot water supply or to convert the high temperature to low temperature for cooling. That is, in the winter heating operation, the heat source required by the heat pump 10 is absorbed from the ground through the groundwater, and in the summer cooling operation, the heat generated by the heat exchange from the heat pump 10 is discharged into the ground via the groundwater. will be.

4A and 4B are enlarged side views illustrating a modified state of the membrane during the installation of the pump pipe of the heat pump system according to the second embodiment of the present invention, and a modified state of the membrane during the operation of the heat pump system.

As shown in these, a blocking film 40 is provided in a radial direction around one side of the pumping pipe 12. The blocking film 40 includes a fixing plate 42 bonded to the outer surface of the pumping pipe 12 and extending horizontally toward the side wall 20a of the tablet 20. The fixing plate 42 is made of a rigid material, and the edge of the fixing plate 42 is spaced apart from the side wall 20a of the tablet 20 by a predetermined interval. The blocking film 40 further includes a deformation plate 44 extending from the edge of the fixing plate 42 to contact the side wall 20a of the tablet 20. The deformation plate 44 is made of a flexible material and is formed to have a shape inclined upward. In the above description that the fixing plate 42 and the deformation plate 44 of the blocking film 40 are made of a separate material and are combined with each other. However, the fixing plate 42 is formed integrally with a single material, but the thickness or density is appropriately adjusted to the fixing plate 42. Stiffness characteristics may be given and the deformation plate 44 may be manufactured to give flexibility characteristics.

As shown in FIG. 4A, when the pumping pipe 12 is drawn into the well 20, the pumping pipe 12 and the barrier membrane 40 are lowered together in the groundwater w. At this time, the resistance of the groundwater w against the descending speed and the force of the pump pipe 12 is applied to the deformation plate 44 of the blocking film 40 so that the deformation plate 44 is spaced apart from the side wall 20a of the well 20. It is deformed to be, and the ground water (w) flows through the gap between the edge of the deformation plate 44 and the side wall (20a) of the tablet 20 can be easily installed in the water pipe (12).

As shown in FIG. 4B, after the construction is completed, the deformation plate 44 is restored to its original position, ie, the edge is in close contact with the side wall 20a of the well 20 by the self-restoring force during the operation of the heat pump system. As described above, since the deforming plate 44 has an inclined shape upward, the groundwater returned from the heat pump 10 (see FIG. 2) into the well 20 through the return pipe 14 is blocked by the blocking film 40. After the flow is blocked, it does not proceed directly to the inflow end 12a of the pump pipe 12, that is, the submersible pump 16, but is absorbed into the ground and heat-exchanged with the ground, and then from the ground to the lower portion of the membrane 40 in the well 20. It will flow in.

5 is a partially enlarged side view of a heat pump system according to a third exemplary embodiment of the present invention.

As shown therein, the well 20 is formed by drilling into the ground from the ground and the upper layer 22 and the bottom of the upper layer 22 where the discharge end 14a of the return pipe 14 (see FIG. 2) is located. It is formed by drilling into the ground from the surface 22a to a cross-sectional area smaller than the upper layer portion 22, and includes the lower layer portion 24 on which the inlet end 12a of the pump pipe 12 and the submersible pump 16 are located. A plate-shaped blocking film 50 is bonded to one outer surface of the pumping pipe 12 and is horizontally extended toward the side wall 20a of the upper layer part 22. The blocking film 50 is placed on the bottom surface 22a of the upper layer part 22 and has a size that allows the upper layer part 22 and the lower layer part 24 to be partitioned with each other. It is set so that the side wall 20a of the upper layer part 22 may not contact. This allows groundwater to flow through the gap between the rim of the barrier film 50 and the side wall 20a of the upper layer 22 when the pumping pipe 12 is drawn into the upper layer 22 during the initial construction, without generating large resistance. This is to allow the pumping pipe 12 to be installed.

With the above configuration, the groundwater returning from the heat pump 10 (see FIG. 2) to the upper layer 22 through the return pipe 14 is blocked by the blocking film 50, and the pumping pipe located in the lower layer 24 ( 12 is not directly proceeded to the inlet end 12a, that is, the submersible pump 16, is absorbed into the ground layer and heat exchanged with the ground, and then flows into the lower layer 24 from the ground layer.

The present invention is not limited to the above embodiments, and various modifications may be made by those skilled in the art without departing from the gist of the present invention as claimed in the claims.

As described above in detail, the heat pump system using the groundwater according to the present invention has the effect of simplifying the construction by integrating the existing intake well and injection well into a single well, thereby reducing the initial investment costs.

In addition, the present invention is a ground membrane that is returned to the well through the return pipe from the heat pump does not proceed directly to the inlet end side of the pumping pipe is absorbed into the ground floor and heat-exchanged with the ground and then the barrier film to enter the inlet end side of the pump pipe from the ground By providing a sufficient ground heat source through the groundwater, the heat efficiency of the heat pump system can be increased, and the depth of definition can be further reduced.

Claims (7)

Heat pump; A well drilled underground and receiving groundwater; A pumping pipe having an inflow end and for supplying groundwater in the well to the heat pump; A return pipe having a discharge end at a position higher than an inflow end of the pump pipe, for returning groundwater discharged from the heat pump into the well; A blocking membrane provided inside the definition at a point between the inflow end of the pump and the discharge end of the return pipe, and prevents groundwater discharged through the discharge end of the return pipe from flowing directly to the inflow end of the pump. Heat pump system using groundwater, characterized in that consisting of. The ground pump heat pump system according to claim 1, wherein the blocking membrane is formed such that a part thereof is expandable to the positive side wall by the pressure of the ground water flowing along the pump pipe. 3. The barrier membrane of claim 2, wherein the barrier membrane surrounds a portion of the pump tube in a longitudinal direction, and a hole is formed in a side wall of the pump tube surrounded by the barrier membrane, so that a part of the groundwater flowing along the pump tube passes through the hole. Heat pump system using groundwater, characterized in that for pressing the inner surface of the barrier membrane. According to claim 1, wherein the barrier film is grounded using a rigid fixing plate coupled to the outer surface of the pump and the flexible deformation plate extending inclined upwardly to the positive side wall along the edge of the fixing plate Heat pump system. According to claim 1, wherein the well is drilled into the ground from the ground and the bottom of the discharge pipe of the return pipe is formed, the bottom of the upper portion is formed by drilling into the ground with a cross-sectional area smaller than the upper layer of the pump Including the lower layer where the inlet is located, The barrier layer is placed on the bottom surface of the upper layer portion heat pump system using groundwater, characterized in that the upper layer and the lower layer partitioning each other. 6. The heat pump system according to claim 5, wherein the blocking membrane has a plate shape and is coupled to an outer surface of the pump pipe. 7. The heat pump system using groundwater according to claim 6, wherein the edge of the blocking film is spaced apart from the side wall of the upper layer.

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