Closed ground source cold and heat exchange system
By using a closed-loop ground source heat exchange system with corrosion-resistant pipes and fillers, the problem of soil temperature imbalance in vertical buried ground source heat pump systems is solved, achieving efficient and compact heat exchange and extending equipment life.
Patent Information
- Application Number
- CN202520386135.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-06
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-03-06
AI Technical Summary
Vertical buried pipe ground source heat pump systems experience an imbalance between heat dissipation in summer and heat absorption in winter during use, leading to a gradual increase or decrease in soil temperature year by year, which affects heat exchange efficiency.
A closed-loop ground source heat exchange system is adopted, including a ground source heat pump unit, a closed-loop ground source heat exchange system, a primary circulating water pump and a secondary circulating water pump. Heat is exchanged with groundwater through a shell-and-tube heat exchanger. The system utilizes pipes and fillers made of corrosion-resistant materials to achieve a highly efficient and compact heat exchange structure.
It achieves rapid and efficient heat exchange, reduces the footprint, extends equipment life, adapts to various geological conditions, and lowers operating costs.
Smart Images
Figure CN223909779U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of ground source heat pump systems, and particularly relates to a closed-loop ground source heat exchange system. Background Technology
[0002] Currently, geothermal heat pump underground heat exchange systems use buried pipe heat exchangers. There are two types of buried pipes: horizontal and vertical. Horizontal buried pipes are usually shallowly buried, with lower excavation technical requirements and lower initial investment than vertical buried pipes, but they occupy a larger area and involve more excavation work. This type was more common in the early applications of ground source heat pump technology, but it is rarely used in current projects.
[0003] Vertical buried pipe ground source heat pump systems occupy a small area and are minimally affected by external factors, making them widely used and developing rapidly. However, in existing vertical buried pipe ground source heat pump systems, a severe imbalance occurs between heat dissipation in summer and heat absorption in winter. Over time, this leads to a gradual increase or decrease in soil temperature, which in turn affects the heat exchange efficiency of the heat exchanger. Utility Model Content
[0004] This invention provides a closed-loop ground source heat exchange system, which aims to solve the problem that vertical buried pipe ground source heat pump systems will cause the soil temperature to rise or fall year by year during long-term use, thereby affecting the heat exchange efficiency of the heat exchanger.
[0005] This utility model is implemented as follows: a closed-loop ground source heat exchange system includes a ground source heat pump unit, a closed-loop ground source heat exchange system, a primary-side circulating water pump of the ground source heat pump, a secondary-side circulating water pump of the ground source heat pump, and a diversion water pump whose outlet is connected to the closed-loop ground source heat exchange system. The primary-side circulating water pump drives the primary-side medium water of the ground source heat pump to circulate between the ground source heat pump unit and the closed-loop ground source heat exchange system. The secondary-side circulating water pump drives the secondary-side circulating water to provide medium water to users, thus completing the circulating water supply.
[0006] The closed-loop ground source heat exchange system consists of several shell-and-tube heat exchangers connected in series. A guide pipe is provided at the bottom of the closed-loop ground source heat exchange system, and the inlet of the diversion water pump is connected to the guide pipe. A seepage pipe is provided at the top of the closed-loop ground source heat exchange system, and an overflow pipe connected to the inner cavity of the closed-loop ground source heat exchange system is provided inside the seepage pipe.
[0007] Preferably, the tube side of the shell-and-tube heat exchanger is made of straight-slit carbon tubes.
[0008] Preferably, the tubes of the shell-and-tube heat exchanger are spiral-seam carbon steel tubes.
[0009] Preferably, the seepage pipe is a concrete pipe.
[0010] Preferably, the flow guide pipe and the overflow pipe are both carbon steel screen pipes.
[0011] Preferably, the outside of the shell-and-tube heat exchanger is filled with gravel.
[0012] Compared with the prior art, the closed ground source cold and heat exchange system has the advantages that: the underground shell-and-tube heat exchanger has a large heat exchange area and a high-efficiency heat exchange structure, can realize rapid and efficient heat exchange, has a compact structure and a small footprint, is suitable for use in a limited underground environment, the shell and the internal pipeline are made of corrosion-resistant materials, can effectively resist corrosion of soil and underground water, prolong the service life, the structure of the underground shell-and-tube heat exchanger is reasonable, convenient to install and maintain, and reduces the operation cost, and the underground shell-and-tube heat exchanger is suitable for various geological conditions and can stably operate under different soil types and underground water levels. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 is a closed ground source cold and heat exchange system.
[0014] In the drawing: 1, ground source heat pump unit; 2, closed ground source cold and heat exchange system; 3, ground source heat pump primary side circulating water pump; 4, ground source heat pump secondary side circulating water pump; 5, shell-and-tube heat exchanger; 6, flow guide pipe; 7, overflow pipe; 8, seepage pipe; 9, drainage water pump. DETAILED DESCRIPTION
[0015] In order to make the purpose, technical scheme and advantages of the closed ground source cold and heat exchange system clearer and more apparent, the following further describes the closed ground source cold and heat exchange system in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the closed ground source cold and heat exchange system and do not limit the closed ground source cold and heat exchange system.
[0016] Please refer to Figure 1 The closed ground source cold and heat exchange system provided by the closed ground source cold and heat exchange system has the advantages that: the closed ground source cold and heat exchange system comprises a ground source heat pump unit 1, a closed ground source cold and heat exchange system 2, a ground source heat pump primary side circulating water pump 3, a ground source heat pump secondary side circulating water pump 4 and a drainage water pump 9 which is in communication with the closed ground source cold and heat exchange system 2.
[0017] The ground source heat pump primary side circulating water pump 3 drives the ground source heat pump primary side hot refrigerant water to circulate between the ground source heat pump unit 1 and the underground closed ground source cold and heat exchange system 2.
[0018] The primary side hot refrigerant water exchanges heat and cold with the refrigerant in the ground source heat pump unit 1, then enters the underground closed ground source cold and heat exchange system 2 to exchange heat and cold with underground water, and finally returns to the ground source heat pump unit 1 to complete a cycle.
[0019] The ground source heat pump secondary side circulating water pump 4 drives the secondary side circulating water to provide heat and cold medium water for users, and completes heat and cold supply.
[0020] The closed ground source cold and heat exchange system 2 is composed of a plurality of tube and shell heat exchangers 5 in series, and a flow guide pipe 6 is arranged at the bottom of the closed ground source cold and heat exchange system 2.
[0021] A seepage pipe 8 is arranged at the top of the closed ground source cold and heat exchange system 2, the inside of the seepage pipe 8 is provided with an overflow pipe 7 in communication with the inner cavity of the closed ground source cold and heat exchange system 2, and the outside of the tube and shell heat exchanger 5 is filled with gravel.
[0022] Under the action of the flow guide pump 9, the underground water enters the closed ground source cold and heat exchange system 2 through the flow guide pipe 6 below the closed ground source cold and heat exchange system 2, and after fully exchanging heat and cold quantity with the ground source heat pump primary side hot heat medium water in the closed ground source cold and heat exchange system 2, the underground water enters the overflow pipe 7, flows into the seepage pipe 8 at the top of the overflow pipe 7, and flows into the gravel layer through the screen holes in the outer wall of the seepage pipe 8.
[0023] The underground water exchanges heat and cold with the underground water and soil in the gravel layer, and after temperature rising and falling, the underground water flows into the flow guide pipe 6 through the screen holes in the outer wall of the flow guide pipe 6 and circulates heat exchange under the action of the flow guide pump 9, and the underground water only circulates underground and does not come out of the ground, does not take water and does not pollute the underground water.
[0024] Further, the tube side of the tube and shell heat exchanger 5 is a straight seam carbon pipe, the shell side of the tube and shell heat exchanger 5 is a spiral seam carbon steel pipe, the seepage pipe 8 is a concrete pipe, and the flow guide pipe 6 and the overflow pipe 7 are carbon steel screen pipes.
[0025] In the embodiment, the shell and the internal pipeline are made of corrosion-resistant materials, which can effectively resist corrosion of soil and underground water and prolong service life.
[0026] The working principle and use process of the utility model are as follows: after the utility model is installed, the ground source heat pump primary side circulating water pump 3 drives the ground source heat pump primary side heat and cold medium water to circulate between the ground source heat pump unit 1 and the underground closed ground source cold and heat exchange system 2, the primary side heat and cold medium water exchanges heat and cold quantity with the refrigerant in the ground source heat pump unit 1, then enters the underground closed ground source cold and heat exchange system 2, exchanges heat and cold quantity with the underground water, and finally returns to the ground source heat pump unit 1 to complete a cycle, the ground source heat pump secondary side circulating water pump 4 drives the secondary side circulating water to provide heat and cold medium water for users, and completes heat and cold supply.
[0027] The above only describes the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model.
Claims
1. A closed-loop ground source heat exchange system, comprising a ground source heat pump unit (1), a closed-loop ground source heat exchange system (2), a primary-side circulating water pump (3), a secondary-side circulating water pump (4), and a diversion pump (9) whose outlet is connected to the closed-loop ground source heat exchange system (2), characterized in that: The ground source heat pump primary side circulating water pump (3) drives the ground source heat pump primary side water to circulate between the ground source heat pump unit (1) and the closed ground source cold and heat exchange system (2), and the secondary side circulating water pump (4) drives the secondary side circulating water to provide water for users to complete the circulating water supply. The closed ground source cold and heat exchange system (2) is composed of a plurality of shell-and-tube heat exchangers (5) in series, the bottom of the closed ground source cold and heat exchange system (2) is provided with a flow guide pipe (6), the water inlet of the flow guide water pump (9) is communicated with the flow guide pipe (6), the top of the closed ground source cold and heat exchange system (2) is provided with a seepage pipe (8), and the inside of the seepage pipe (8) is provided with an overflow pipe (7) communicated with the inner cavity of the closed ground source cold and heat exchange system (2).
2. The closed ground source heat exchange system of claim 1, wherein: The tube side of the shell-and-tube heat exchanger (5) is a straight seam carbon tube.
3. The closed ground source heat exchange system of claim 1, wherein: The shell side of the shell-and-tube heat exchanger (5) is a spiral seam carbon steel tube.
4. The closed ground source heat exchange system of claim 1, wherein: The seepage pipe (8) is a concrete pipe.
5. The closed ground source heat exchange system of claim 1, wherein: The flow guide pipe (6) and the overflow pipe (7) are both carbon steel screen pipes.
6. The closed ground source heat exchange system of claim 1, wherein: The shell-and-tube heat exchanger (5) is externally filled with gravel.