A composite air conditioning system suitable for shallow geothermal cycle

Abstract

The utility model discloses a kind of composite air conditioning systems suitable for shallow geothermal circulation, it is related to geothermal energy utilization and air conditioning technical field.The composite air conditioning system suitable for shallow geothermal circulation, including underground well heat exchange system, water softening treatment system and heat pump circulation system, heat exchange structure, distribution water collector assembly, detection unit, the water softening treatment system includes salt tank, softener, water tank, the heat pump circulation system includes heat pump unit, the heat pump unit is connected with water tank, the heat pump unit includes refrigeration mode and heating mode.The utility model can stably utilize geothermal system to heat and refrigerate, by to underground supply object water, to be able to heat absorption from underground or heat release to underground, can make geothermal heat balance, reach the purpose of energy saving;Optimize the circuit of air conditioning system, not in the division of water suction well and water discharge well, realize single underground well to carry out heat absorption and release cycle, reduce construction cost and use cost.

Description

Technical Field

[0001] This utility model relates to the field of geothermal energy utilization and air conditioning technology, and in particular to a composite air conditioning system suitable for shallow geothermal circulation. Background Technology

[0002] Currently, the application of geothermal air conditioning in the industry mostly adopts a technical solution with solar energy as the core and geothermal energy as an auxiliary: that is, it mainly uses solar heat to achieve cooling and heating functions, and only uses geothermal energy as a backup energy source to assist in operation when solar energy supply is insufficient.

[0003] In this model, the utilization rate of geothermal energy is low, and the system operation is highly dependent on the stability of solar energy. However, in northern my country, the availability of solar energy resources is significantly limited due to factors such as season, climate, and sunshine duration (e.g., short sunshine hours and frequent cloudy / snowy weather in winter lead to insufficient solar energy supply). The aforementioned solar energy-based technical solutions are difficult to meet the demand for stable operation of air conditioning systems in northern regions and have poor applicability. Utility Model Content

[0004] The purpose of this invention is to provide a composite air conditioning system suitable for shallow geothermal circulation, which solves the technical problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a composite air conditioning system suitable for shallow geothermal circulation, including an underground well heat exchange system, a water softening treatment system and a heat pump circulation system, a heat exchange structure, a water manifold assembly, and a detection unit. The water softening treatment system includes a salt tank, a softener, and a water tank, and the water tank and the softener are connected by a pipe.

[0006] The heat pump cycle system includes a heat pump unit connected to a water tank, and the heat pump unit includes a cooling mode and a heating mode.

[0007] The water distribution manifold assembly includes water distribution manifold one, water distribution manifold two, water distribution manifold three, and water distribution manifold four. Each of the water distribution manifold one, water distribution manifold two, water distribution manifold three, and water distribution manifold four is equipped with a valve to control the on / off state and flow rate of the corresponding branch.

[0008] The underground well heat exchange system includes an underground well and buried heat exchange pipes inside the well;

[0009] The circulating water pump is connected in the system pipeline and drives water to circulate between the water tank, heat pump unit, heat exchange structure, underground well, manifold 1, manifold 2, manifold 3, manifold 4 and indoor terminal.

[0010] Preferably, the heat pump unit includes a compressor, an evaporator, a condenser, and a throttling device.

[0011] Preferably, the heat exchange structure is a plate heat exchanger.

[0012] Preferably, the detection unit includes a temperature detector and a controller, wherein the temperature detector detects the surface temperature and the underground temperature, and the controller is electrically connected to the temperature detector.

[0013] Preferably, a brine delivery pump is provided between the brine tank and the softener, and the brine tank and the softener are connected by the brine delivery pump.

[0014] Preferably, a brine delivery pump is provided between the brine tank and the softener to deliver the brine from the brine tank to the softener.

[0015] Preferably, the water tank is equipped with a ladder and guardrail, and the water tank is equipped with a float valve and a level gauge.

[0016] Compared with related technologies, the composite air conditioning system for shallow geothermal circulation provided by this utility model has the following beneficial effects:

[0017] 1. This utility model provides a composite air conditioning system suitable for shallow geothermal circulation, which can stably utilize the geothermal system for heating and cooling. By supplying water to the underground, it can absorb heat from or release heat to the underground, thereby balancing the heat balance of the geothermal system and achieving the goal of saving energy.

[0018] 2. This utility model provides a composite air conditioning system suitable for shallow geothermal circulation, which optimizes the air conditioning system circuit, eliminates the distinction between water intake wells and water discharge wells, and realizes heat absorption and release circulation in a single underground well, thereby reducing construction and operating costs.

[0019] 3. This utility model provides a composite air conditioning system suitable for shallow geothermal circulation, which abandons the design of traditional systems where solar energy undertakes the cooling / heating function, optimizes the original system with solar energy as the main energy source and geothermal energy as the auxiliary energy source, and reduces construction and operating costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a plan view of the pipeline layout of this utility model;

[0022] Figure 3 This is a detailed drawing of the evaporator and condenser piping of the ground source heat pump unit of this utility model;

[0023] Figure 4 This is a detailed drawing of the circulating water pump connection pipe of this utility model;

[0024] Figure 5This is a schematic diagram of the water tank structure of this utility model;

[0025] Figure 6 This is a schematic diagram of the buried pipe system of this utility model;

[0026] Figure 7 This is the general drawing of the underground pipe of this utility model;

[0027] Figure 8 This is a schematic cross-sectional view of the vertical buried pipe of this utility model;

[0028] Figure 9 This is a top view of the double U-shaped underground pipe of this utility model.

[0029] In the diagram: 1. Salt tank; 2. Softener; 3. Water tank; 4. Heat pump unit; 5. Heat exchange structure; 6. Manifold 1; 7. Manifold 2; 8. Manifold 3; 9. Manifold 4; 10. Circulating water pump. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0031] Example 1:

[0032] Please see Figures 1-9 This utility model provides a technical solution: a composite air conditioning system suitable for shallow geothermal circulation, including an underground well heat exchange system, a water softening treatment system and a heat pump circulation system, a heat exchange structure 5, a water manifold assembly and a detection unit. The water softening treatment system includes a salt tank 1, a softener 2 and a water tank 3, and the water tank 3 and the softener 2 are connected by a pipe.

[0033] The heat pump cycle system includes a heat pump unit 4, which is connected to a water tank 3. The heat pump unit 4 includes a cooling mode and a heating mode.

[0034] The manifold assembly includes manifold 1 (6), manifold 2 (7), manifold 3 (8), and manifold 4 (9). Each of manifold 1 (6), manifold 2 (7), manifold 3 (8), and manifold 4 (9) is equipped with a valve to control the on / off state and flow rate of the corresponding branch.

[0035] The underground well heat exchange system includes the underground well and the buried heat exchange pipes inside the well.

[0036] In this implementation plan, the U-shaped elbows of the vertical buried pipe heat exchanger should be pre-made U-shaped elbow components. The assembly length of the U-shaped tubes in the vertical buried pipe heat exchanger should meet the requirements of the loop manifold connection after insertion into the borehole. The two open ends of the assembled U-shaped tubes should be sealed in time. The installation of the U-shaped tubes of the vertical buried pipe heat exchanger should be carried out immediately after the borehole is drilled and the borehole wall has solidified. When the borehole wall is not firm or there are holes or cavities that make bundling difficult, a protective sleeve should be installed. During the tube lowering process, the U-shaped tubes should be filled with water. After installation and after the pressure is qualified, the original slurry should be backfilled, the borehole sealed, and protected immediately. The U-shaped elbows (pre-made components) of the vertical buried pipe heat exchanger are the core carrier for realizing bidirectional circulation in a single well. The two branch pipes (the straight pipes on both sides of the U-shaped tube) naturally form independent "inlet-return" flow channels, and a closed loop can be completed without the need for an additional well body.

[0037] The circulating water pump 10 is connected to the system pipeline and drives water to circulate between the water tank 3, the heat pump unit 4, the heat exchange structure 5, the underground well, the water manifold 1 6, the water manifold 2 7, the water manifold 3 8, the water manifold 4 9 and the indoor terminal.

[0038] Among them, the heat pump unit 4 includes a compressor, an evaporator, a condenser, and a throttling device. By controlling the coordinated operation of the compressor, evaporator, condenser, and throttling device, the switching between cooling and heating modes can be achieved.

[0039] Among them, heat exchange structure 5 is a plate heat exchanger.

[0040] The detection unit includes a temperature detector and a controller. The temperature detector detects the surface temperature and the underground temperature, and the controller is electrically connected to the temperature detector.

[0041] A brine delivery pump is provided between the brine tank 1 and the softener 2, and the brine tank 1 and the softener 2 are connected by the brine delivery pump.

[0042] In this embodiment, the brine tank 1 delivers brine to the softener 2 via a brine transfer pump. The softener 2 uses the principle of ion exchange to remove calcium and magnesium ions from the water, thus preventing scale buildup in the system pipes and equipment. The softened water is then stored in the water tank 3.

[0043] The water tank 3 is equipped with a ladder and guardrail, and the water tank 3 is equipped with a float valve and a level gauge.

[0044] In this implementation scheme, the water tank 3 maintains a stable water level through an internal float valve and a level gauge, while the external ladder and guardrail facilitate maintenance and provide a stable circulating water source for the system.

[0045] Example 2:

[0046] Main equipment parameters

[0047] (1) Two screw-type ground source heat pump units (each with dual compressors), with a heating capacity of 1222KW and a cooling capacity of 1193kw per unit;

[0048] (2) Design pressure: 1.6 MPa on the ground source side; 1.6 MPa on the user side.

[0049] (3) Design temperature: Winter: 8.5 / 5℃ on the ground source side; 45 / 40℃ on the secondary side; Summer: 28 / 33℃ on the ground source side; 7 / 12℃ on the secondary side.

[0050] (4) Ground source side circulation pump: 3 units (2 operating, 1 standby, variable frequency) Single unit flow rate: 262t / h Head: 300kPa Power: 37KW

[0051] (5) User-side circulating pumps: 3 units (2 in operation, 1 standby, frequency converter) Single unit flow rate: 225t / h Head: 330kPa Power: 37KW

[0052] (6) Ground source water supply pump: 2 units (1 in use and 1 on standby, one variable frequency drive pump to one pump, both pumps to start in case of an accident)

[0053] Single unit flow rate: 4.7 t / h; Head: 100 kPa; Power: 0.37 KW; System set pressure: 0.05 MPa; Safety valve opening pressure: 0.15 MPa

[0054] (7) User-side water supply pumps: 2 units (1 in use and 1 on standby, one variable frequency drive for one pump, both pumps to start in case of an accident)

[0055] Single unit flow rate: 4.0t / h; head: 460kPa; power: 2.2W; system constant pressure: 0.41MPa; safety valve opening pressure: 0.51MPa.

[0056] Working Principle: This system comprises three core modules: an underground well heat exchange system, a water softening system, and a heat pump circulation system. The brine tank 1 uses a brine transfer pump to deliver brine to the softener 2. The softener 2 removes calcium and magnesium ions from the water, effectively preventing scaling on system pipes and equipment. The softened water is then stored in the water tank 3, which uses an internal float valve and level gauge for automatic water level control. External ladders and guardrails facilitate maintenance and operation, providing a stable circulating water source for the entire system. The underground well system, as a crucial heat exchange medium, forms a stable heat exchange interface between its internal heat exchange pipes and the underground soil, enabling bidirectional energy transfer for summer heat storage and winter heat extraction.

[0057] The manifold is divided into a ground source side loop and a user side loop. The ground source side loop manifold is connected to the underground well heat exchange pipe group, and the user side loop manifold is connected to the indoor area.

[0058] Winter Heating: The ground source side loop manifold sends circulating water into underground wells and buried pipes. The water exchanges heat with the soil, absorbing shallow geothermal heat (low-grade heat), and its temperature rises. It is then transported through pipes to the heat pump unit 4. Part of the heated water flows back to the buried pipes to continue absorbing heat, ensuring a stable heat supply. The heat pump unit upgrades low-grade heat to high-grade heat through circulation. Part of the hot water enters the heat exchanger and is distributed to indoor terminals via the user-side loop manifold to release heat. The water that cools down after releasing heat at the indoor terminals flows back to the heat exchanger through the user-side manifold, completing the user-side heat cycle.

[0059] Summer Cooling: The ground-source side loop manifold sends circulating water into underground wells and buried pipes. The water cools down after exchanging heat with the low-temperature soil in summer (absorbing cold energy), and then enters the heat pump unit to transfer the cold energy. The ground-source side circulating water, having absorbed indoor heat, flows back to the buried pipes through the ground-source side manifold, releasing heat into the soil. In the heat exchanger, hot water carrying indoor heat exchanges heat with cold water supplied by the heat pump. The cooled water returns to the indoor terminal through the user-side loop manifold, continuously absorbing ambient heat. The heat-absorbing hot water then re-enters the heat exchanger, forming a user-side cooling energy cycle.

[0060] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A combined air conditioning system suitable for shallow geothermal cycle, comprising a ground well heat exchange system, a water softening treatment system and a heat pump cycle system, a heat exchange structure (5), a distribution water reservoir assembly, a detection unit, characterized in that, The water softening system includes a salt tank (1), a softener (2), and a water tank (3), with the water tank (3) and the softener (2) connected by a pipe. The heat pump cycle system includes a heat pump unit (4), which is connected to a water tank (3). The heat pump unit (4) includes a cooling mode and a heating mode. The water distribution manifold assembly includes water distribution manifold one (6), water distribution manifold two (7), water distribution manifold three (8), and water distribution manifold four (9). Each of the water distribution manifold one (6), water distribution manifold two (7), water distribution manifold three (8), and water distribution manifold four (9) is equipped with a valve to control the opening and closing of the corresponding branch and the flow rate. The underground well heat exchange system includes an underground well and buried heat exchange pipes inside the well; A circulating water pump (10) is connected to the system pipeline and drives water to circulate between the water tank (3), the heat pump unit (4), the heat exchange structure (5), the underground well, the first water manifold (6), the second water manifold (7), the third water manifold (8), the fourth water manifold (9), and the indoor terminal.

2. A composite air conditioning system suitable for shallow geothermal circulation according to claim 1, characterized in that: The heat pump unit (4) includes a compressor, an evaporator, a condenser, and a throttling device.

3. The hybrid air conditioning system of claim 1, wherein: The heat exchange structure (5) is a plate heat exchanger.

4. The hybrid air conditioning system of claim 1, wherein: The detection unit includes a temperature detector and a controller. The temperature detector detects the surface temperature and the underground temperature, and the controller is electrically connected to the temperature detector.

5. The hybrid air conditioning system of claim 1, wherein: A brine delivery pump is provided between the salt tank (1) and the softener (2), and the salt tank (1) and the softener (2) are connected by the brine delivery pump.

6. The hybrid air conditioning system of claim 1, wherein: The water tank (3) is equipped with a ladder and guardrail, and the water tank (3) is equipped with a float valve and a level gauge.

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