Ground Convection Heat Exchanger-Type Heat Pump System

Abstract

The present invention relates to an underground convection heat exchange type heat pump system, and aims to eliminate the conventional heat exchanger structure and simultaneously achieve simplification of the system configuration and improvement of geothermal heat absorption efficiency. That is, the present invention is characterized by comprising a geothermal tube heat exchanger configured to absorb geothermal heat through heat exchange with geothermal water flowing convectively inside a geothermal tube, and by transferring the geothermal heat absorbed in the geothermal tube heat exchanger to a heat pump through a geothermal heat heat exchanger, and by configuring the heat heat medium circulating through the heat pump to supply heat to a load unit via a load heat heat exchanger. Therefore, by performing a direct heat absorption and heat transfer cycle inside a geothermal well, the present invention eliminates the conventional heat exchanger structure and has the effect of simultaneously achieving simplification of the system configuration and improvement of geothermal heat absorption efficiency.

Description

Technology Field

[0001] The present invention relates to a subsurface convective heat exchange type heat pump system, and more specifically, the invention aims to achieve a heat pump system comprising a geothermal tube heat exchanger configured to absorb geothermal heat through heat exchange with geothermal water flowing convectively inside a geothermal well, and a load unit configured to receive a load heat medium from the geothermal tube heat exchanger, the geothermal heat heat exchanger, the heat pump, and the load heat heat exchanger to provide heating or cooling, thereby eliminating the structure of a conventional heat exchanger and simultaneously achieving a simplified system configuration and improved geothermal heat absorption efficiency by performing a direct heat absorption and heat transfer cycle inside the geothermal well. Background Technology

[0003] Generally, a heat pump system is a system that can heat or cool a load by controlling the temperature level of an external heat source, such as geothermal energy, through the pumping and circulation of a heat medium.

[0005] A conventional heat pump system as described above comprises: a geothermal well installed at a certain depth to form a geothermal absorption cavity in the ground; a geothermal well circulation pipe configured to absorb geothermal heat through heat exchange with geothermal water flowing convectively inside the geothermal well; a heat geothermal water heat exchanger configured to transfer a heat source to a heat geothermal water that supplies a heat source to a heat pump through heat exchange with the geothermal water that has absorbed geothermal heat through the geothermal well circulation pipe; a geothermal heat heat exchanger configured to transfer a heat source to a heat heat medium pumped and circulated by the heat pump through the heat geothermal water heat exchanger; a heat pump configured to control the temperature level of heat by pumping and circulating the heat heat medium that has absorbed a heat source through the geothermal heat heat exchanger; and a heat heat medium configured to receive the heat heat medium pumped and circulated from the heat pump and supply heat by exchanging heat with a load heat medium. The system comprises a load heat exchanger, a heat medium switching valve configured to switch and control the circulation path of a heat medium pumped and circulated by a heat pump according to the cooling or heating operation of the load, a load unit configured to receive a load heat medium from the load heat exchanger and to heat or cool, a heat control unit configured to control the operation of the heat pump, the heat medium switching valve, and each circulation pump according to the operating conditions of the load unit, and a load control unit configured to allow a user to select and operate the heating or cooling operation.

[0007] In such a conventional heat pump system, the geothermal water absorbed from a geothermal well is not supplied directly to the geothermal heat exchanger of the heat pump system, but is instead supplied through the geothermal water heat exchanger to prevent contamination from the outside, thereby ensuring stable operation of the heat pump system.

[0009] However, conventional heat pump systems as described above had problems in that geothermal water was not supplied directly to the heat pump system but was transferred through a separate heat exchanger, resulting in system heat loss, a complex mechanical configuration, and difficult maintenance. Prior art literature

[0010] Republic of Korea Patent No. 10-2280276 The problem to be solved

[0011] Accordingly, the present invention aims to solve the problems of conventional heat pump systems as described above, in which geothermal water is not supplied directly to the heat pump system but is transferred through a separate heat exchanger, resulting in system heat loss, a complex mechanical configuration, and difficult maintenance. means of solving the problem

[0012] That is, the present invention relates to a heat pump system comprising: a geothermal pipe heat exchanger configured to absorb geothermal heat by heat exchange with geothermal water flowing convectively inside a geothermal pipe, and a geothermal pipe installed at a certain depth to form a geothermal heat absorption pipe in the ground; a geothermal heat heat exchanger configured to transfer the heat source absorbed through the geothermal pipe heat exchanger to a heat heat medium pumped and circulated by a heat pump; a heat pump configured to control the temperature level of heat by pumping and circulating the heat heat medium that has absorbed the heat source through the geothermal heat heat exchanger; a load heat heat exchanger configured to supply heat by receiving the heat heat medium pumped and circulated from the heat pump and exchanging heat with a load heat medium; a heat medium switching valve configured to control the switching path of the heat heat medium pumped and circulated by the heat pump according to the cooling or heating operation of the load; and from the load heat heat exchanger It is characterized by comprising a load unit configured to receive a load heat medium and enable heating or cooling, a heat control unit configured to control the operation of a heat pump, a heat medium switching valve, and each circulation pump according to the operating conditions of the load unit, and a load control unit configured to allow a user to select and operate the heating or cooling operation.

[0014] The present invention is characterized by comprising: a geothermal pipe heat exchanger section positioned from the top to the bottom of a geothermal pipe to absorb geothermal heat through heat exchange with geothermal water flowing convectively inside the geothermal pipe; a geothermal water supply pipe provided to supply the geothermal water that has absorbed geothermal heat to the geothermal heat exchanger section; a geothermal water return pipe provided to supply geothermal water for geothermal heat absorption from the geothermal heat exchanger section to the geothermal heat exchanger section; and a geothermal water circulation pump provided to provide a circulation force so that geothermal water can circulate in the geothermal pipe heat exchanger section.

[0016] The present invention is characterized by having a heat conduction particle density control unit that enables the geothermal water of a geothermal well to undergo smooth vertical convective flow and to have heat conduction particles of a density having appropriate heat conduction characteristics.

[0018] The present invention is characterized by comprising a heat conduction particle density control unit comprising: a density sensing unit for detecting the density of internal geothermal water in a geothermal well; a heat conduction particle input unit configured to increase the density by introducing heat conduction particles when the density of the geothermal water is lower than a set value; a density control material input unit configured to decrease the density by introducing water to cause the geothermal water to overflow when the density of the geothermal water is higher than a set value; and a density control control unit that controls the operation of the heat conduction particle input unit and the density control material input unit according to the detection through the density sensing unit.

[0020] The present invention is characterized by forming a negative charge-inducing layer by adsorbing anionic surfactants such as SDS (Sodium Dodecyl Sulfate), SDBS (Sodium Dodecylbenzene Sulfonate), and LAS (Linear Alkylbenzene Sulfonate) onto the surface of a core heat exchanger so as to induce a negative charge so that heat-conducting particles contained in geothermal water do not adhere to the surface of the core heat exchanger. Effects of the invention

[0022] Accordingly, the present invention comprises a geothermal tube heat exchanger configured to absorb geothermal heat through heat exchange with geothermal water flowing convectively inside a geothermal tube, and a load unit configured to provide heating or cooling by receiving a load heat medium from the geothermal tube heat exchanger, a geothermal heat heat exchanger, a heat pump, and a load heat heat exchanger. By performing a direct heat absorption and heat transfer cycle inside the geothermal tube, the invention eliminates the structure of conventional heat exchangers and has the effect of simultaneously achieving simplification of the system configuration and improvement of geothermal heat absorption efficiency. Brief explanation of the drawing

[0024] FIG. 1 is a main configuration diagram showing one embodiment of the present invention. FIG. 2 is a diagram illustrating the main configuration of an embodiment of the present invention. FIG. 3 is a detailed example diagram of a geothermal well showing one embodiment of the present invention. FIG. 4 is a detailed example diagram of a geothermal well showing another embodiment of the present invention. FIG. 5 is an illustrative diagram showing another embodiment of the present invention. FIG. 6 is a detailed exemplary diagram of a tube heat exchanger section showing another embodiment of the present invention. Specific details for implementing the invention

[0025] The following is a detailed explanation based on the attached drawings.

[0026] The present invention is designed to simultaneously achieve system configuration simplification and improved geothermal absorption efficiency. Since the description of the present invention is merely an example for structural or functional explanation, the scope of the rights of the present invention should not be interpreted as being limited by the examples described in the text.

[0027] That is, since the embodiments can be modified in various ways and can take various forms, the scope of the present invention should be understood to include equivalents capable of realizing the technical concept.

[0028] Furthermore, the purposes or effects presented in this invention do not imply that specific embodiments must include all of them or only such effects; therefore, the scope of the rights of this invention should not be understood as being limited by them.

[0030] That is, the present invention comprises a heat pump system consisting of a geothermal well (100), a geothermal well heat exchanger, a geothermal heat exchanger (420), a heat pump (400), a load heat exchanger (430), a heat medium switching valve (410), a load unit (500), a heat control unit (610), and a load control unit (620).

[0032] Here, the geothermal well (100) is installed by being buried at a certain depth so as to form a geothermal heat absorption tube in the ground.

[0034] In addition, the above-mentioned geothermal tube heat exchanger is configured to absorb geothermal heat through heat exchange with geothermal water flowing convectively inside the geothermal tube.

[0036] The above geothermal pipe heat exchanger is composed of a pipe heat exchanger section (210) positioned from the top to the bottom of the geothermal pipe so as to absorb geothermal heat through heat exchange with geothermal water flowing convectively inside the geothermal pipe, a geothermal water supply pipe (220) provided to supply geothermal water that has absorbed geothermal heat to the pipe heat exchanger section (210) to a geothermal heat heat exchanger section (420), a geothermal water return pipe (230) provided to supply geothermal water for geothermal heat absorption from the geothermal heat exchanger section (420) to the pipe heat exchanger section (210), and a geothermal water circulation pump (240) provided to provide a circulation force so as to circulate geothermal water in the geothermal pipe heat exchanger section.

[0037] It is preferable that the above-mentioned tube heat exchanger (210) be formed from a stainless steel tube body having high thermal conductivity and low corrosion resistance.

[0038] The above-mentioned pipe heat exchanger section (210) may be constructed entirely of PE pipes, and a certain portion of the upper or lower part of the inlet pipe section may be constructed of a stainless steel pipe, and a portion of the upper or lower part of the outlet pipe section may be constructed of a stainless steel pipe at a location different from the location of the stainless steel pipe provided in the inlet pipe section.

[0040] In addition, the above geothermal heat exchanger (420) is configured to transfer heat source heat exchange to a heat medium that is pumped and circulated by a heat pump (400) through a geothermal pipe heat exchanger.

[0042] In addition, the heat pump (400) is configured to pump and circulate a heat medium that has absorbed heat from a heat source through a geothermal heat exchanger (420) so as to control the temperature level of the heat.

[0044] In addition, the load heat exchanger (430) is configured to receive a heat medium pumped and circulated from the heat pump (400) and to supply heat by exchanging heat with the load heat medium.

[0046] In addition, the heat medium switching valve (410) is configured to control the switching of the circulation path of the heat medium pumped and circulated from the heat pump (400) according to the cooling or heating operation of the load unit (500).

[0048] In addition, the load section (500) is configured to receive a load heat medium from the load heat exchanger (430) and to provide heating or cooling.

[0050] Additionally, the load section (500) is composed of a load heat medium supply pipe (510) configured to receive a load heat medium for heat exchange through a load heat heat exchanger (430), a load heat medium return pipe (520) configured to return and supply the load heat medium that has completed heat exchange from the load section (500) to the load heat heat exchanger (430), and a load heat medium circulation pump (530) configured to provide a circulation force to circulate the load heat medium between the load heat heat exchanger (430) and the load section (500).

[0052] In addition, the heat control unit (610) is configured to control the operation of the heat pump (400), the heat medium switching valve (410), and each circulation pump according to the operating conditions of the load unit (500).

[0054] In addition, the load control unit (620) is configured to allow the user to select and operate the heating or cooling operation.

[0056] Meanwhile, in the implementation of the present invention, the geothermal water of the geothermal well (100) may be provided with a heat conduction particle density control unit that allows the geothermal water to flow smoothly in the up-and-down convection and has heat conduction particles of a density having appropriate heat conduction characteristics.

[0058] The above-mentioned heat conduction particle density control unit may be implemented by comprising a density sensing unit (710) that detects the density of the internal geothermal water of the geothermal well (100), a heat conduction particle input unit (720) provided to increase the density by introducing heat conduction particles when the density of the geothermal water is lower than a set value, a density control water input unit (730) provided to decrease the density by introducing water to cause the geothermal water to overflow when the density of the geothermal water is higher than a set value, and a density control control unit (740) that controls the operation of the heat conduction particle input unit (720) and the density control water input unit (730) according to the detection through the density sensing unit (710). The above-mentioned density sensing unit (710) may be implemented by selecting either a light sensor method that transmits light through the geothermal water or a method that measures the electrical conductivity of the geothermal water.

[0060] The above-mentioned heat conduction particle input unit (720) can be implemented by being composed of a heat conduction particle tank in which metal particles or ceramic particles such as soil are stored, and a screw injector for injecting the heat conduction particles from the heat conduction particle tank. The above-mentioned density control water input unit (730) can be implemented by being composed of a water supply unit connected to a water supply pipe and a water supply valve that controls the water supply of the water supply unit.

[0062] Meanwhile, another embodiment of the present invention may be implemented by forming a negative charge induction layer (211) by adsorbing an anionic surfactant such as SDS (Sodium Dodecyl Sulfate), SDBS (Sodium Dodecylbenzene Sulfonate), or LAS (Linear Alkylbenzene Sulfonate) onto the surface of the pipe heat exchanger (210) so that negative charges can be induced so that heat-conducting particles contained in the geothermal water do not adhere to the surface of the pipe heat exchanger (210).

[0064] The following describes the effects of the application of the present invention.

[0065] As described above, in a heat pump system, a geothermal well (100) is installed at a certain depth to form a geothermal heat absorption pipe in the ground, and a geothermal well heat exchanger is provided to absorb geothermal heat through heat exchange with geothermal water flowing convectively inside the geothermal well; a geothermal heat heat exchanger (420) is provided to transfer the heat source absorbed through the geothermal well heat exchanger to a heat heat medium pumped and circulated by a heat pump (400); a heat pump (400) is provided to pump and circulate the heat medium that has absorbed the heat source through the geothermal heat heat exchanger to control the temperature level of the heat; a load heat heat exchanger (430) is provided to receive the heat medium pumped and circulated from the heat pump and supply heat by exchanging heat with a load heat medium; and pumped and circulated from the heat pump according to the cooling or heating operation of the load unit (500). By applying the present invention, which is configured to include a heat medium switching valve (410) capable of switching and controlling the circulation path of the heat medium, a load unit (500) capable of receiving a load heat medium from the load heat exchanger to provide heating or cooling, a heat control unit (610) capable of controlling the operation of the heat pump, the heat medium switching valve, and each circulation pump according to the operating conditions of the load unit, and a load operation unit (620) capable of allowing a user to select and operate the operation of heating or cooling, the conventional heat exchanger structure can be eliminated, and the simplification of the system configuration and the improvement of geothermal heat absorption efficiency can be achieved simultaneously.

[0067] That is, the present invention allows for stable absorption through direct heat exchange with geothermal water without relying on an external heat source, through a geothermal well (100) that is installed buried at a certain depth underground to form a geothermal heat absorption pipe.

[0069] In addition, the pipe heat exchanger section (210), which is positioned from the top to the bottom inside the geothermal pipe (100), effectively absorbs geothermal heat through contact heat exchange with geothermal water flowing up and down convectively inside, thereby having the effect of improving the efficiency of geothermal source utilization.

[0071] At this time, the tube heat exchanger (210) is composed of a stainless steel heat exchanger body having high thermal conductivity and corrosion resistance, thereby maintaining long-term durability and excellent heat transfer efficiency even in a repetitive operating environment.

[0072] The geothermal heat absorbed through the above-mentioned pipe heat exchanger (210) is transferred to a heat medium circulated by a heat pump (400) via a geothermal heat exchanger (420).

[0073] This geothermal heat exchanger (420) contributes to improving the performance index (COP) of the heat pump while minimizing heat source transfer loss, and

[0074] The heat medium is pumped and circulated through the heat pump (400), and the temperature level can be raised or lowered to be adjusted to a temperature range suitable for cooling and heating conditions.

[0076] The controlled heat medium is supplied to the load heat exchanger (430) and performs heat exchange with the load heat medium on the load side, thereby effectively supplying the heating and cooling heat required for indoor use.

[0077] At this time, the heat medium switching valve (410) automatically switches and controls the circulation path of the heat medium according to the cooling or heating operation mode, thereby enabling it to respond appropriately to operating conditions in real time without manual operation and improving the responsiveness and control efficiency of the system.

[0079] The load section (500) is configured to directly transfer heat supplied from the load heat exchanger (430) to the indoor space and is configured to include a load heat medium supply pipe (510), a load heat medium return pipe (520), and a load heat medium circulation pump (530), thereby enabling stable heat transfer by circulating the load heat medium.

[0081] In addition, the heat control unit (610) enables autonomous and precise operation according to seasonal or spatial conditions by integrally controlling the operation of the heat pump (400), each circulation pump, and heat medium switching valve (410) according to load conditions.

[0082] In addition, the load control unit (620) allows the user to directly select cooling or heating operation, thereby providing both user convenience and control flexibility. Furthermore, by additionally providing a heat conduction particle density control unit configured to maintain heat conduction particles of appropriate density with heat conduction characteristics so that the geothermal water inside the geothermal well (100) can flow smoothly in the up and down convection, the flow characteristics according to the density change of the geothermal water can be detected in real time and automatically controlled to always maintain an ideal circulation environment.

[0084] In particular, the density of the geothermal water is detected through the density sensing unit (710), and the density is actively controlled through the heat conduction particle input unit (720) and the density control material input unit (730). Since the density can be maintained according to the operating conditions under the control of the density control control unit (740), the heat exchange performance can be stably secured for a long period of time.

[0086] In addition, a negative charge induction layer (211) is formed on the surface of the pipe heat exchanger (210) so that heat-conducting particles or fine contaminant particles contained in the geothermal water do not adhere to the pipe wall, and the adhesion of foreign matter can be suppressed by the surface electrostatic repulsion force, thereby enabling simultaneous prevention of wall contamination and preservation of the heat exchange area, and having the effect of maintaining the initial thermal efficiency even during long-term operation.

[0088] Consequently, the present invention eliminates the complex heat exchanger structure of conventional systems by solving structural complexity, while enabling improved geothermal heat absorption efficiency, energy savings, and high-efficiency cooling and heating operation based on automatic control, thereby providing the effect of simultaneously securing practicality and economic benefits.

[0090] The present invention, as described above, has the following specific effects.

[0091] First, the efficiency of utilizing the geothermal source is improved by positioning the pipe heat exchanger (210), formed of a stainless steel material with high thermal conductivity, from the top to the bottom of the geothermal pipe, so that the geothermal water within the geothermal pipe circulates according to the up-and-down convective flow and the heat absorption efficiency from the geothermal water heat source connected thereto can be maximized.

[0093] Second, the simplification of the system configuration is realized, and the heat exchange and circulation are integrated within an integrated structure centered on the tube heat exchanger (210) without an external heat exchanger or a complex fluid distribution system, thereby improving structural simplicity and ease of maintenance.

[0095] Third, operational stability and automated control are implemented; through automatic control operation via the heat control unit and load control unit, it is possible to flexibly respond to seasonal or spatial requirements, and ensure the stability and reliability of the system.

[0097] Fourth, energy saving and improved operating efficiency can be achieved by minimizing the operating energy of the heat medium through a self-circulating structure utilizing the stable securing of underground heat sources and the upward and downward convective flow of geothermal water, while also achieving high cooling and heating efficiency.

[0099] Fifth, flexibility in the scope of application is ensured, as each component of the present invention is designed with a modular structure, allowing it to adapt to various capacity conditions and architectural environments, and enabling the construction of a customized system, thereby increasing practicality.

[0101] Sixth, flow optimization is achieved by real-time detection and control of the density state of the geothermal water. This is achieved by detecting the physical density of the geothermal water through the density detection unit (710), adjusting the density through the heat conduction particle input unit (720) and the density control material input unit (730), and enabling integrated control through the density control control unit (740), thereby ensuring that the vertical convective flow of the geothermal water is maintained smoothly without stagnation, thereby securing the stability of the geothermal heat exchange efficiency.

[0103] Seventh, the negative charge induction layer formed on the surface of the pipe heat exchanger can prevent contamination and continuously maintain thermal efficiency. By adsorbing anionic surfactants such as SDS, SDBS, and LAS onto the surface of the heat exchanger to form a negative charge induction layer (211), the attachment of heat-conducting particles or clay-based foreign substances in the geothermal water is prevented, and the initial thermal efficiency can be maintained for a long period without loss of heat transfer area, thereby providing both ease of maintenance and reliability of operation.

[0105] As described above, the present invention resolves the structural complexity and efficiency degradation issues of conventional geothermal heat pump systems and has the effect of simultaneously improving cooling and heating performance and ensuring economic efficiency in system operation. Explanation of the symbols

[0107] 100 : Geothermal well 210: Tube tip heat exchanger section 211: Negative charge induction layer 220 : Geothermal water supply pipe 230 : Geothermal water return pipe 240 : Geothermal water circulation pump 400 : Heat pump 410: Heat transfer fluid switching valve 420: Geothermal heat exchanger 430 : Load heat exchanger 500 : Load section 510: Load heat medium supply pipe 520: Load heat medium return pipe 530 : Load heat medium circulation pump 610: Heat control unit 620: Load control unit 710 : Density sensing unit 720 : Heat-conducting particle input unit 730 : Density control water input section 740 : Density control section

Claims

Claim 1 In a subsurface convective heat exchange type heat pump system, a geothermal well (100) is installed and buried at a certain depth to form a geothermal heat absorption space in the ground; a well heat exchanger section (210) is provided to be positioned from the top to the bottom of the geothermal well (100) so as to absorb geothermal heat through heat exchange with geothermal water flowing convectively inside the geothermal well (100); a geothermal water supply pipe (220) is provided to supply geothermal water that has absorbed geothermal heat to the well heat exchanger section (210) to a geothermal heat heat exchanger section (420); a geothermal water return pipe (230) is provided to supply geothermal water for geothermal heat absorption from the geothermal heat exchanger section (420) to the well heat exchanger section (210); and a system is provided to provide a circulation force so that geothermal water can circulate in the geothermal well heat exchanger section. A geothermal pipe heat exchanger comprising a geothermal water circulation pump (240); a geothermal heat heat exchanger (420) configured to transfer a heat source absorbed through the geothermal pipe heat exchanger to a heat heat medium pumped and circulated by a heat pump (400); a heat pump (400) configured to pump and circulate a heat medium that has absorbed a heat source through the geothermal heat heat exchanger (420) to control the temperature level of heat; a load heat heat exchanger (430) configured to receive a heat medium pumped and circulated from the heat pump (400) and supply heat by exchanging heat with a load heat medium; a heat medium switching valve (410) configured to switch and control the circulation path of the heat medium pumped and circulated by the heat pump (400) according to the cooling or heating operation of the load unit (500); and the A load unit (500) configured to receive a load heat medium from a load heat heat exchanger (430) to enable heating or cooling; and a heat control unit (610) configured to control the operation of the heat pump (400), the heat medium switching valve (410), and each circulation pump according to the operating conditions of the load unit (500);The system includes a load control unit (620) configured to allow a user to select and operate heating or cooling operations, a density sensing unit (710) for detecting the density of the geothermal water so that the geothermal water of the geothermal well (100) can flow smoothly in an upward and downward convective manner, a heat-conducting particle injection unit (720) for injecting heat-conducting particles when the density of the geothermal water is lower than a set value, a density control water injection unit (730) for injecting water to cause the geothermal water to overflow and lower the density when the density of the geothermal water is higher than a set value, and a density control control unit (740) for controlling the operation of the heat-conducting particle injection unit (720) and the density control water injection unit (730) according to the detection of the density sensing unit (710), and an anionic surfactant is applied to the surface of the well heat exchanger (210) to induce a negative charge so that heat-conducting particles contained in the geothermal water do not adhere to it. A subsurface convection heat exchange type heat pump system characterized by having a negative charge induction layer (211) formed by adsorption on the surface, wherein the pipe heat exchanger section (210) is composed entirely of PE pipes, or a certain portion of the upper or lower part of the inlet pipe section is formed as a stainless steel pipe, and a stainless steel pipe section is formed at a different location from the stainless steel pipe section in the upper or lower part of the outlet pipe section. Claim 2 delete Claim 3 delete

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