Annularly-arranged buried pipe ground source heat pump system capable of achieving balanced heat exchange

Abstract

The utility model discloses an annularly-arranged buried pipe ground source heat pump system capable of achieving balanced heat exchange. The annularly-arranged buried pipe ground source heat pump system solves the problem that part of heat exchange vertical shafts of an existing annularly-arranged buried pipe ground source heat pump system are prone to functional failure. A heat exchange water input annular mother pipe (7) with the closed tail end and a heat exchange water output annular mother pipe (8) with the closed head end are arranged on the outer side of the annularly-arranged hot well, and the head end of the heat exchange water input annular mother pipe (7) is connected to a circulating water pump output water opening (5) of a circulating water pump (4). The tail end of the heat exchange water output annular mother pipe (8) is connected to a circulating water pump water inlet (6) of the circulating water pump (4); a heat exchange water input port of each U-shaped buried heat exchange pipe is communicated with a heat exchange water input annular mother pipe (7), and a heat exchange water output port of each U-shaped buried heat exchange pipe is communicated with a heat exchange water output annular mother pipe (8); and the same heat exchange water circulation frequency of each hot well is ensured.

Description

Technical Field

[0001] This utility model relates to a heat pump system, and more particularly to a ground source heat pump system with a ring-shaped arrangement of buried pipes that can achieve balanced heat exchange. Background Technology

[0002] Geothermal energy is an important non-carbon-based renewable resource with advantages such as local availability, stability, reliability, green and low-carbon characteristics, and economic viability. Actively constructing a clean, low-carbon, safe, and efficient geothermal energy utilization system is currently a hot topic. Geothermal resources mainly include shallow geothermal energy, hydrothermal geothermal energy, and hot dry rock geothermal energy. Shallow geothermal energy refers to thermal energy resources located at a certain depth (generally less than 200 meters) below the Earth's surface in soil, rocks, and groundwater, with temperatures below 25℃ (this varies by region). This thermal energy mainly originates from solar radiation and the Earth's gradient warming. The development of shallow geothermal energy primarily utilizes buried pipe ground source heat pump systems. First, sampling wells are drilled on the pre-developed surface. After the geothermal samples pass the testing, annular heat wells are drilled. After the annular heat wells are completed, U-shaped buried heat exchange tube bundles are lowered into the drilled annular heat wells, exposing the U-shaped buried heat exchange tubes on the surface. The ends of each U-shaped buried heat exchanger pipe are connected to the water distribution header pipe via connector fittings. One end of each U-shaped buried heat exchanger pipe is connected to the inlet header pipe before heat exchange via connector fittings, and the other end of each U-shaped buried heat exchanger pipe is connected to the outlet header pipe after heat exchange via connector fittings. The outer ends of the inlet header pipe before heat exchange and the outlet header pipe after heat exchange are connected to the heat pump via circulating water pumps, respectively. Since each hot water well is arranged in a ring on the ground, the distance between the outer ends of each U-shaped buried heat exchanger pipe and the heat pump varies. This results in a higher circulation frequency of the heat exchange medium in the U-shaped buried heat exchanger pipes closer to the heat pump, causing heat exchange overload in the heat exchanger shafts closer to the heat pump. This directly leads to functional failure of the heat exchanger shafts, such as shaft collapse, leakage, blockage, and cracks. This affects the operational safety of adjacent shafts. In severe cases, the entire system may fail to achieve the desired heat exchange output, or even cause the entire heat exchange system to shut down. Summary of the Invention

[0003] This invention provides a ring-shaped ground source heat pump system with buried pipes that can achieve balanced heat exchange, solving the technical problem that some heat exchange shafts in existing ring-shaped ground source heat pump systems are prone to functional failure.

[0004] This utility model solves the above technical problems through the following technical solution:

[0005] A ring-shaped buried pipe ground source heat pump system capable of achieving balanced heat exchange includes heat wells, a circulating water pump, and a ground source heat pump arranged in a ring at equal intervals around the same circumference on the ground. Each heat well is equipped with a U-shaped buried heat exchange pipe. The circulating water pump and the ground source heat pump are located on the ground to the left of the ring-shaped heat wells, and the ground source heat pump is connected to the circulating water pump. A closed-end hot water inlet ring header and a closed-end hot water outlet ring header are respectively installed on the outside of the ring-shaped heat wells. The first end of the hot water inlet ring header is connected to the circulating water pump. At the outlet of the circulating water pump, the end of the hot water input ring header is sealed by an end sealing plate, and the end of the hot water output ring header is connected to the inlet of the circulating water pump. The beginning of the hot water output ring header is sealed by a beginning sealing plate. The rings where each heat well is located, the hot water input ring header, and the hot water output ring header are arranged in a concentric circle. The hot water input port of each U-shaped buried heat exchanger is connected to the hot water input ring header, and the hot water output port of each U-shaped buried heat exchanger is connected to the hot water output ring header.

[0006] The ring-shaped hot wells are equipped with left-middle-upper and right-middle-lower hot wells. The left-middle-upper hot well is equipped with a left-middle-upper U-shaped buried heat exchange pipe. The top of the left-middle-upper U-shaped buried heat exchange pipe is equipped with a heat exchange pipe inlet and a heat exchange pipe outlet. A first heat exchange water input branch pipe is connected between the heat exchange pipe inlet and the heat exchange water input ring main pipe. A second heat exchange water output branch pipe is connected between the heat exchange pipe outlet and the heat exchange water output ring main pipe. A right-middle-lower U-shaped buried heat exchange pipe is installed in the right-middle-lower hot well. A right-middle-lower heat exchange pipe inlet and outlet are respectively installed at the top of the right-middle-lower U-shaped buried heat exchange pipe. A third hot water inlet branch pipe is connected between the right-middle-lower heat exchange pipe inlet and the hot water inlet ring main pipe. A fourth hot water outlet branch pipe is installed between the right-middle-lower heat exchange pipe outlet and the hot water outlet ring main pipe. The length of the right-middle-lower U-shaped buried heat exchange pipe is equal to the length of the left-middle-upper U-shaped buried heat exchange pipe. The length of the third hot water inlet branch pipe is equal to the length of the first hot water inlet branch pipe. The length of the fourth hot water outlet branch pipe is equal to the length of the second hot water outlet branch pipe.

[0007] The geothermal wells of this invention are arranged in a ring, with adjacent vertical wells spaced at equal arc intervals to ensure verticality. The arc interval between the wells should not be too small, otherwise it will affect the geothermal heat exchange effect. The U-shaped buried heat exchange pipes are made of PE pipes and buried vertically. After the surface hot water delivery pipe is connected to the U-shaped buried heat exchange pipes with U-shaped joints, a pressure test is performed on the connected U-shaped buried heat exchange pipes before they are lowered into the wells. After they are lowered into the wells, a pressure test is performed again to check the airtightness of the buried pipes, further preventing pipe rupture or leakage that could cause hydraulic imbalance and affect heat exchange performance. The U-shaped buried heat exchange pipes are connected in parallel to ensure that the heat transfer of each pipeline does not interfere with each other and is easy to control. By using a shared hot water input header and a shared hot water output header after heat exchange, the same hot water circulation frequency is ensured for each heat well, overcoming the defect of heat exchange overload in some heat exchange vertical wells. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of this utility model;

[0009] Figure 2 This is a schematic diagram of the structure of the U-shaped buried heat exchanger pipe 7 of this utility model;

[0010] Figure 3 This is a schematic diagram of the structure of the U-shaped buried heat exchange pipe 7 of this utility model from a top view.

[0011] Figure 4 This is a ground layout diagram of the hot wells arranged in a ring shape according to this utility model. Detailed Implementation

[0012] The present invention will now be described in detail with reference to the accompanying drawings:

[0013] A ring-shaped buried pipe ground source heat pump system capable of achieving balanced heat exchange includes heat wells, a circulating water pump 4, and a ground source heat pump 3 arranged in a ring at equal intervals around the same circumference on the ground. Each heat well is equipped with a U-shaped buried heat exchange pipe. The circulating water pump 4 and the ground source heat pump 3 are located on the ground to the left of the ring-shaped heat wells, and the ground source heat pump 3 is connected to the circulating water pump 4. Outside the ring-shaped heat wells, a closed-end hot water inlet ring header 7 and a closed-end hot water outlet ring header 8 are respectively installed. The first end of the hot water inlet ring header 7 is connected to the circulating water pump outlet 5 of the circulating water pump 4. The end of the hot water inlet ring header 7 is sealed by an end-sealing plate 18. The end-sealing plate 18 ensures that the hot water from the circulating water pump outlet 5 before heat exchange can only flow counterclockwise in the hot water inlet ring header 7 and simultaneously enter the U-shaped buried heat exchange pipes in each heat well at the same flow rate. The hot water outlet ring header... The end of 8 is connected to the circulating water pump inlet 6 of the circulating water pump 4. The first end of the hot water output ring header 8 is blocked by the first end sealing plate 15. The setting of the first end sealing plate 15 ensures that the hot water after heat exchange in the hot water output ring header 8 can only flow in a counterclockwise direction, and allows the hot water after heat exchange from the U-shaped buried heat exchange pipes in each hot well to enter the hot water output ring header 8 synchronously, and then flow into the circulating water pump inlet 6; thus realizing the synchronous circulation of hot water in each hot well, avoiding the occurrence of heat exchange overload due to high heat exchange frequency in individual hot wells; the ring where each hot well is located, the hot water input ring header 7 and the hot water output ring header 8 are arranged in a concentric circle to ensure that the hot water path in each hot well is equal. The hot water input port of each U-shaped buried heat exchange pipe is connected to the hot water input ring header 7, and the hot water output port of each U-shaped buried heat exchange pipe is connected to the hot water output ring header 8.

[0014] A left-middle-upper hot well 1 and a right-middle-lower hot well 2 are respectively set in the annular arrangement of hot wells. A left-middle-upper U-shaped buried heat exchange pipe 9 is set in the left-middle-upper hot well 1. A heat exchange pipe inlet 11 and a heat exchange pipe outlet 12 are respectively set at the top of the left-middle-upper U-shaped buried heat exchange pipe 9. A first heat exchange water input branch pipe 13 is connected between the heat exchange pipe inlet 11 and the heat exchange water input annular main pipe 7. A second heat exchange water output branch pipe (14) is set between the heat exchange pipe outlet 12 and the heat exchange water output annular main pipe 8.

[0015] A right-middle-lower U-shaped buried heat exchange pipe 10 is installed in the right-middle-lower hot well 2. A right-middle-lower heat exchange pipe inlet and a right-middle-lower heat exchange pipe outlet are respectively installed at the top of the right-middle-lower heat exchange pipe 10. A third hot water input branch pipe 16 is connected between the right-middle-lower heat exchange pipe inlet and the hot water input ring main pipe 7. A fourth hot water output branch pipe 17 is installed between the right-middle-lower heat exchange pipe outlet and the hot water output ring main pipe 8. The length of the right-middle-lower U-shaped buried heat exchange pipe 10 is equal to the length of the left-middle-upper U-shaped buried heat exchange pipe 9. The length of the third hot water input branch pipe 16 is equal to the length of the first hot water input branch pipe 13. The length of the fourth hot water output branch pipe 17 is equal to the length of the second hot water output branch pipe 14.

[0016] A method for laying out a ring-shaped buried pipe ground source heat pump system includes heat wells, a circulating water pump 4, and a ground source heat pump 3 arranged in a ring with equal arc intervals on the same circumference of the ground. A U-shaped buried heat exchange pipe is installed in each heat well. The circulating water pump 4 and the ground source heat pump 3 are located on the ground to the left of the ring-shaped heat wells, and the ground source heat pump 3 is connected to the circulating water pump 4. A left-middle-upper hot water exchange well 1 and a right-middle-lower hot water exchange well 2 are respectively installed in the ring-shaped heat wells arranged in a ring with equal arc intervals on the same circumference. The method is characterized by the following steps:

[0017] Step 1: On the outside of the annularly arranged hot wells, install a closed-end hot water inlet annular header 7 and a closed-end hot water outlet annular header 8, so that the center of the hot water inlet annular header 7, the center of the hot water outlet annular header 8 and the center of the annularly arranged hot wells coincide.

[0018] The second step is to connect the starting port of the hot water inlet ring main pipe 7 to the circulating water pump outlet 5 of the circulating water pump 4. The end of the hot water inlet ring main pipe 7 is sealed by the end sealing piece 18. The end port of the hot water outlet ring main pipe 8 is connected to the circulating water pump inlet 6 of the circulating water pump 4. The starting end of the hot water outlet ring main pipe 8 is sealed by the beginning sealing piece 15.

[0019] The third step is to install the left-middle-upper U-shaped buried heat exchange pipe 9 in the left-middle-upper hot water well 1, connect the first hot water input branch pipe 13 between the hot water input port 11 at the top of the left-middle-upper U-shaped buried heat exchange pipe 9 and the hot water input ring main pipe 7, and connect the second hot water output branch pipe 14 between the heat exchange pipe outlet 12 and the hot water output ring main pipe 8.

[0020] Step 4: Install the right-middle-lower U-shaped buried heat exchange pipe 10 in the right-middle-lower hot water well 2, connect the hot water inlet at the top of the right-middle-lower U-shaped buried heat exchange pipe 10 to the hot water inlet ring pipe 7, and connect the fourth hot water outlet ring pipe 17 between the heat exchange pipe outlet and the hot water outlet ring pipe 8.

[0021] Step 5: Install U-shaped buried heat exchange pipes in other hot wells arranged in a ring at equal intervals on the same circumference of the ground. Using the same method as in Step 4, connect each U-shaped buried heat exchange pipe to the hot water input ring header 7 and the hot water output ring header 8.

[0022] Because the hot water inlets of the U-shaped buried heat exchange pipes in each of the hot wells, which are arranged in a ring at equal intervals on the same circumference, are all connected in parallel to the same hot water inlet ring header 7; and the hot water outlets of the U-shaped buried heat exchange pipes in each hot well are all connected in parallel to the same hot water outlet ring header 8; the hot water 19 from the circulating water pump outlet 5 of the circulating water pump 4 fills the hot water inlet ring header 7 in a counterclockwise direction and enters the U-shaped buried heat exchange pipes in each hot well simultaneously. After the hot water 19 in the U-shaped buried heat exchange pipes exchanges heat with the shallow geothermal water 20 in the hot well, it returns to the hot water outlet ring header 8 simultaneously. Then, it enters the circulating water pump inlet 6 of the circulating water pump 4 in a counterclockwise direction and finally circulates back to the ground source heat pump 3, thus realizing the synchronous circulation of hot water in each hot well and achieving uniform heat exchange in each hot well.

[0023] The first hot water inlet branch pipe 13, the second hot water outlet branch pipe 14, the third hot water inlet branch pipe 16, and the fourth hot water outlet branch pipe 17 are all arranged in the radial direction. Furthermore, the length of the first hot water inlet branch pipe 13 is equal to the length of the third hot water inlet branch pipe 16, and the length of the second hot water outlet branch pipe 14 is equal to the length of the fourth hot water outlet branch pipe 17.

Claims

1. A ring-shaped buried pipe ground source heat pump system capable of achieving balanced heat exchange, comprising heat wells, a circulating water pump (4), and a ground source heat pump (3) arranged in a ring at equal intervals on the same circumference on the ground, wherein a U-shaped buried heat exchange pipe is installed in each heat well, the circulating water pump (4) and the ground source heat pump (3) are located on the ground to the left of the ring-shaped heat wells, and the ground source heat pump (3) is connected to the circulating water pump (4), characterized in that, Outside the annularly arranged hot wells, there are two hot water inlet rings (7) and outlet rings (8) with closed ends. The outlet of the hot water inlet ring (7) is connected to the outlet of the circulating water pump (4). The end of the hot water inlet ring (7) is blocked by the end sealing plate (18). The end of the hot water outlet ring (8) is connected to the inlet of the circulating water pump (4). The outlet of the hot water outlet ring (8) is blocked by the head sealing plate (15). The annulus, the hot water inlet ring (7), and the hot water outlet ring (8) of each hot well are arranged in a concentric circle. The hot water inlet of each U-shaped buried heat exchanger is connected to the hot water inlet ring (7). The hot water outlet of each U-shaped buried heat exchanger is connected to the hot water outlet ring (8).

2. The ground source heat pump system with a ring-shaped arrangement for balanced heat exchange according to claim 1, characterized in that, A left-middle-upper hot well (1) and a right-middle-lower hot well (2) are respectively set in the annular arrangement of hot wells. A left-middle-upper U-shaped buried heat exchange pipe (9) is set in the left-middle-upper hot well (1). A heat exchange pipe inlet (11) and a heat exchange pipe outlet (12) are respectively set at the top of the left-middle-upper U-shaped buried heat exchange pipe (9). A first heat exchange water input branch pipe (13) is connected between the heat exchange pipe inlet (11) and the heat exchange water input annular main pipe (7). A second heat exchange water output branch pipe (14) is set between the heat exchange pipe outlet (12) and the heat exchange water output annular main pipe (8).

3. A ground source heat pump system with a ring-shaped arrangement for balanced heat exchange according to claim 2, characterized in that, A right-middle-lower U-shaped buried heat exchange pipe (10) is installed in the right-middle-lower hot well (2). A right-middle-lower heat exchange pipe inlet and a right-middle-lower heat exchange pipe outlet are respectively installed at the top of the right-middle-lower U-shaped buried heat exchange pipe (10). A third heat exchange water input branch pipe (16) is connected between the right-middle-lower heat exchange pipe inlet and the heat exchange water input ring main pipe (7). A fourth heat exchange water output branch pipe (17) is installed between the right-middle-lower heat exchange pipe outlet and the heat exchange water output ring main pipe (8). The length of the right-middle-lower U-shaped buried heat exchange pipe (10) is equal to the length of the left-middle-upper U-shaped buried heat exchange pipe (9). The length of the third heat exchange water input branch pipe (16) is equal to the length of the first heat exchange water input branch pipe (13). The length of the fourth heat exchange water output branch pipe (17) is equal to the length of the second heat exchange water output branch pipe (14).

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