Heat accumulation adjusting system for energy pile group in area with main cooling function

Abstract

The utility model discloses an energy pile group hot accumulation adjusting system in a cold supply main area, which comprises a heat pump unit, a hot water user, an energy pile group, a heat storage pile group, a water inlet pipe, a water return pipe, a phase change pipe, a critical temperature sensing device, a temperature control switch and a hot water circulating pump, an inlet and an outlet of the heat pump unit are connected with an inlet and an outlet of the built-in buried pipe of the energy pile group through a main water inlet pipe and a main water return pipe. An inlet and an outlet of the hot water user are connected with an inlet and an outlet of the heat storage pile group built-in buried pipe through a main heat exchange water inlet pipe and a main heat exchange water return pipe. The energy pile group and the heat storage pile group are arranged in a crossed mode. The phase change latent heat of the inorganic phase change material is utilized, so that the energy storage efficiency of the energy pile is enhanced; and meanwhile, domestic hot water is provided through temperature control induction by utilizing the phase change heat storage pile, so that the problem of heat accumulation caused by the fact that heat released to soil in a cold supply main area is larger than absorbed heat is effectively solved, waste heat resources are effectively recycled, and resource waste is avoided.

Description

Technical Field

[0001] This utility model relates to the field of energy pile group technology for ground source heat pump systems, specifically a thermal accumulation regulation system for energy pile groups in areas where cooling is the primary function. Background Technology

[0002] Traditional building pile foundations primarily support the weight of the building, while energy piles represent an innovative design that integrates a traditional underground pipe heat exchanger with the pile foundation. While the pile foundation bears the building load, the energy pile utilizes the available space within the pile foundation to install the heat exchanger. In this way, the energy pile can effectively extract thermal energy from the underground soil to provide heating and cooling for the building. This design not only reduces the cost of drilling holes separately for the underground pipes but also effectively solves the problem of traditional underground pipe heat exchangers occupying a large amount of space, thus bringing significant economic benefits.

[0003] In areas primarily reliant on cooling, building cooling loads exceed heating loads. This results in the heat discharged into the soil during the summer exceeding the heat absorbed from the soil during the winter, causing a gradual increase in soil temperature and, over time, leading to heat accumulation in the soil. This not only intensifies thermal interference between the energy piles, reducing their heat exchange efficiency, but also lowers the overall efficiency of the energy pile heat pump system, increasing energy consumption. Currently, the common approach is to add cooling towers or similar auxiliary cooling systems to remove excess heat and alleviate heat accumulation. However, this method not only increases system energy consumption but also wastes energy due to the ineffective recovery of excess heat.

[0004] In view of the above problems, it is necessary to design an energy pile group heat accumulation regulation system to effectively solve the problem of heat accumulation caused by the release of heat into the soil exceeding the absorption of heat in areas mainly for cooling, while effectively recovering waste heat resources and avoiding the waste of energy resources. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model discloses a heat accumulation regulation system for energy pile groups in areas primarily for cooling. This system solves the problem of soil heat accumulation and thermal interference between energy piles in cooling areas, and fully utilizes the heat accumulated in the soil for the domestic hot water system, achieving efficient utilization of waste heat.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a thermal accumulation regulation system for an energy pile group in a region primarily for cooling, comprising a pile group, a heat pump unit, hot water users, a temperature control switch, and a hot water circulation pump; the pile group consists of an interleaved distribution of energy piles and thermal storage piles, wherein: the energy pile group includes eight independent energy piles, each energy pile having an inlet pipe, a return pipe, grouting, a phase change pipe, and an inorganic phase change material inside; the phase change pipe is disposed in the cavity of the energy pile, the inorganic phase change material is encapsulated within the phase change pipe, and grouting fills the cavity between the phase change pipe and the pile wall; the thermal storage pile group includes eight independent storage... Each thermal storage pile is equipped with a heat exchange inlet pipe, a heat exchange return pipe, a summer phase change material, and a critical temperature sensing device. The summer phase change material fills the internal cavity of the thermal storage pile. The critical temperature sensing devices are arranged at three-meter intervals along the depth direction of the inner wall of the pile, and the critical temperature is set to 40°C. The inlet and return pipes of the energy pile group are respectively connected in parallel to the condenser or evaporator circulation loop of the heat pump unit. The heat exchange inlet and return pipes of the thermal storage pile group are respectively connected in parallel to the circulation loop of the hot water user. The temperature control switch and the hot water circulation pump are connected in series at the outlet end of the main heat exchange return pipe of the thermal storage pile group.

[0007] Preferably, the energy pile group includes a first energy pile, a second energy pile, a third energy pile, a fourth energy pile, a fifth energy pile, a sixth energy pile, a seventh energy pile, and an eighth energy pile. The water inlet pipes of each energy pile are connected in parallel to the main water inlet pipe and then connected to the condenser or evaporator outlet of the heat pump unit. The water return pipes of each energy pile are connected in parallel to the main water return pipe and then connected to the condenser or evaporator inlet of the heat pump unit.

[0008] Preferably, the thermal storage pile group includes a first thermal storage pile, a second thermal storage pile, a third thermal storage pile, a fourth thermal storage pile, a fifth thermal storage pile, a sixth thermal storage pile, a seventh thermal storage pile, and an eighth thermal storage pile. The heat exchange inlet pipes of each thermal storage pile are connected in parallel to the main heat exchange inlet pipe and then connected to the hot water user outlet. The heat exchange return pipes of each thermal storage pile are connected in parallel to the main heat exchange return pipe and then connected to the hot water user inlet.

[0009] Preferably, the critical temperature sensing device is connected to the temperature control switch signal, and the temperature control switch is triggered to open when the detected temperature reaches 40°C.

[0010] Preferably, the pile bodies of the energy pile and the heat storage pile are made of steel fiber reinforced concrete, and the water inlet pipe, the water return pipe, the heat exchange water inlet pipe and the heat exchange water return pipe are all made of PE material.

[0011] Preferably, the phase change tube of the energy pile is vertically arranged in the center of the pile body cavity, and the inorganic phase change material is sealed inside the phase change tube.

[0012] Preferably, the critical temperature sensing device of the thermal storage pile is arranged near the inner wall of the pile body, with one device every three meters along the depth direction.

[0013] Preferably, the input end of the temperature control switch is connected to the outlet of the main heat exchange return water pipe, and the output end is connected to the hot water user inlet through the hot water circulation pump to form a closed loop.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. In this utility model, by adopting a method of cross-arranging energy pile groups and phase change thermal storage pile groups, the phase change characteristics of the phase change material in the thermal storage pile group are utilized to effectively alleviate the problem of soil heat accumulation and thermal interference between energy piles in areas mainly for cooling.

[0016] 2. In this utility model, a critical temperature sensing device is set to monitor the heat stored in the thermal storage pile. When the temperature reaches the preset critical value, the temperature control switch is turned on to supply the heat from the thermal storage pile to hot water users, thereby making full use of the waste heat and avoiding resource waste.

[0017] 3. In this utility model, inorganic phase change materials are filled into the energy pile group to improve the energy storage efficiency of the energy pile through the latent heat of phase change, thereby enhancing the heat exchange. Attached Figure Description

[0018] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0019] In the attached diagram:

[0020] Figure 1 This is a schematic diagram of a thermal accumulation regulation system for energy pile groups in a cooling-oriented area, provided in this embodiment.

[0021] Figure 2 This is a schematic diagram of the cross arrangement of energy pile groups and thermal storage pile groups provided in this embodiment;

[0022] Figure 3 This is a schematic diagram of the energy pile structure provided in this embodiment;

[0023] Figure 4 This is a schematic diagram of the thermal storage pile structure provided in this embodiment;

[0024] Numbered in the diagram: 1. Pile group; 2. Heat pump unit; 2-1. Main inlet pipe; 2-2. Main return pipe; 3. Hot water user; 3-1. Main heat exchange inlet pipe; 3-2. Main heat exchange return pipe; 4. Energy pile group; 4-1. First energy pile; 4-2. Second energy pile; 4-3. Third energy pile; 4-4. Fourth energy pile; 4-5. Fifth energy pile; 4-6. Sixth energy pile; 4-7. Seventh energy pile; 4-8. Eighth energy pile; 5. Thermal storage pile group; 5-1. First thermal storage pile; 5- 2. Second thermal storage pile; 5-3. Third thermal storage pile; 5-4. Fourth thermal storage pile; 5-5. Fifth thermal storage pile; 5-6. Sixth thermal storage pile; 5-7. Seventh thermal storage pile; 5-8. Eighth thermal storage pile; 6. Inlet pipe; 6-1. First inlet pipe; 6-2. Second inlet pipe; 6-3. Third inlet pipe; 6-4. Fourth inlet pipe; 6-5. Fifth inlet pipe; 6-6. Sixth inlet pipe; 6-7. Seventh inlet pipe; 6-8. Eighth inlet pipe; 7. Return pipe; 7-1. First return pipe; 7-2, Second Return Water Pipe; 7-3, Third Return Water Pipe; 7-4, Fourth Return Water Pipe; 7-5, Fifth Return Water Pipe; 7-6, Sixth Return Water Pipe; 7-7, Seventh Return Water Pipe; 7-8, Eighth Return Water Pipe; 8, Heat Exchange Inlet Water Pipe; 8-1, First Heat Exchange Inlet Water Pipe; 8-2, Second Heat Exchange Inlet Water Pipe; 8-3, Third Heat Exchange Inlet Water Pipe; 8-4, Fourth Heat Exchange Inlet Water Pipe; 8-5, Fifth Heat Exchange Inlet Water Pipe; 8-6, Sixth Heat Exchange Inlet Water Pipe; 8-7, Seventh Heat Exchange Inlet Water Pipe; 8-8, Eighth Heat Exchange Inlet Water Pipe 9. Inlet pipe; 10. Heat exchange return pipe; 11. First heat exchange return pipe; 9.2. Second heat exchange return pipe; 9.3. Third heat exchange return pipe; 9.4. Fourth heat exchange return pipe; 9.5. Fifth heat exchange return pipe; 9.6. Sixth heat exchange return pipe; 9.7. Seventh heat exchange return pipe; 9.8. Eighth heat exchange return pipe; 10. Grouting; 11. Phase change pipe; 12. Inorganic phase change material; 13. Summer phase change material; 14. Critical temperature sensing device; 15. Temperature control switch; 16. Hot water circulation pump. Detailed Implementation

[0025] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0026] Example: Figure 1 As shown, a thermal accumulation regulation system for energy pile groups in areas primarily for cooling includes:

[0027] 1. Pile group; 2. Heat pump unit; 3. Hot water user; 4. Energy pile group; 5. Thermal storage pile group; 6. Temperature control switch; 7. Hot water circulation pump.

[0028] The inlet of the main heat exchange inlet pipe 2-1 is connected to the outlet of the condenser or evaporator in the heat pump unit 2; the outlet of the main heat exchange return pipe 2-2 is connected to the inlet of the condenser or evaporator in the heat pump unit 2; the inlet of the main heat exchange inlet pipe 3-1 is connected to the outlet of the hot water user 3; the outlet of the main heat exchange return pipe 3-2 is connected to the inlet of the hot water user 3. The temperature control switch 15 is connected to the outlet of the main heat exchange return pipe 3-2; the hot water circulation pump 16 is connected to the outlet of the main heat exchange return pipe 3-2.

[0029] like Figure 2 As shown, the diagram shows the cross-arrangement of the energy pile group and the thermal storage pile group, including: energy pile group 4, thermal storage pile group 5, water inlet pipe 6, water return pipe 7, heat exchange water inlet pipe 8, and heat exchange water return pipe 9.

[0030] Energy pile group 4 includes: first energy pile 4-1, second energy pile 4-2, third energy pile 4-3, fourth energy pile 4-4, fifth energy pile 4-5, sixth energy pile 4-6, seventh energy pile 4-7, and eighth energy pile 4-8.

[0031] The thermal storage pile group 5 includes: the first thermal storage pile 5-1, the second thermal storage pile 5-2, the third thermal storage pile 5-3, the fourth thermal storage pile 5-4, the fifth thermal storage pile 5-5, the sixth thermal storage pile 5-6, the seventh thermal storage pile 5-7, and the eighth thermal storage pile 5-8.

[0032] Energy pile group 4 and thermal storage pile group 5 are distributed in an alternating manner. The pile bodies of energy piles and thermal storage piles are made of steel fiber reinforced concrete.

[0033] The first to eighth energy piles are respectively equipped with a first water inlet pipe 6-1, a second water inlet pipe 6-2, a third water inlet pipe 6-3, a fourth water inlet pipe 6-4, a fifth water inlet pipe 6-5, a sixth water inlet pipe 6-6, a seventh water inlet pipe 6-7, and an eighth water inlet pipe 6-8; and corresponding first return water pipes 7-1, second return water pipes 7-2, third return water pipes 7-3, fourth return water pipes 7-4, fifth return water pipes 7-5, sixth return water pipes 7-6, seventh return water pipes 7-7, and eighth return water pipes 7-8. Water pipes 7-8; the inlet water pipe 6, return water pipe 7, heat exchange inlet water pipe 8, and heat exchange return water pipe 9 are all made of PE material; the first to eighth inlet water pipes are connected in parallel and are connected to the outlet of the main inlet water pipe 2-1; the first to eighth return water pipes are connected in parallel and are connected to the inlet of the main return water pipe 2-2; the inlet of the main inlet water pipe 2-1 is connected to the outlet of the condenser or evaporator in the heat pump unit 2; the outlet of the main return water pipe 2-2 is connected to the inlet of the condenser or evaporator in the heat pump unit 2;

[0034] The first to eighth thermal storage piles are respectively equipped with a first heat exchange inlet pipe 8-1, a second heat exchange inlet pipe 8-2, a third heat exchange inlet pipe 8-3, a fourth heat exchange inlet pipe 8-4, a fifth heat exchange inlet pipe 8-5, a sixth heat exchange inlet pipe 8-6, a seventh heat exchange inlet pipe 8-7, and an eighth heat exchange inlet pipe 8-8; and corresponding first heat exchange return pipes 9-1, second heat exchange return pipes 9-2, third heat exchange return pipes 9-3, fourth heat exchange return pipes 9-4, and... The system includes five heat exchange return pipes 9-5, six heat exchange return pipes 9-6, seven heat exchange return pipes 9-7, and eight heat exchange return pipes 9-8; the first to eighth heat exchange inlet pipes are connected in parallel and are connected to the outlet of the main heat exchange inlet pipe 3-1; the first to eighth heat exchange return pipes are connected in parallel and are connected to the inlet of the main heat exchange return pipe 3-2; the inlet of the main heat exchange inlet pipe 3-1 is connected to the outlet of hot water user 3; and the outlet of the main heat exchange return pipe 3-2 is connected to the inlet of hot water user 3.

[0035] like Figure 3 The diagram shows the structure of the energy pile, which includes: an inlet pipe 6, a return pipe 7, a grouting 10, a phase change pipe 11, and an inorganic phase change material 12.

[0036] The first to eighth energy piles in the energy pile group 4 each contain an inlet pipe 6, a return pipe 7, a grouting 10, a phase change pipe 11, and an inorganic phase change material 12. The phase change pipe 11 is placed vertically in the cavity of the energy pile. The inorganic phase change material 12 is poured into the phase change pipe 11. The grouting 10 is poured into the cavity of the energy pile.

[0037] like Figure 4 The schematic diagram of the thermal storage pile structure shown in the figure includes: heat exchange inlet pipe 8, heat exchange return pipe 9, summer phase change material 13, and critical temperature sensing device 14.

[0038] The first to eighth thermal storage piles in the thermal storage pile group 5 each contain a heat exchange inlet pipe 8, a heat exchange return pipe 9, a summer phase change material 13, and a critical temperature sensing device 14. The summer phase change material 13 is filled in the internal cavity of the thermal storage pile. The critical temperature sensing device 14 is arranged near the inner wall of the thermal storage pile, and one is arranged every three meters along the depth direction. The critical temperature value of the critical temperature sensing device 14 is set to 40℃.

[0039] When the critical temperature sensing device 14 reaches the critical temperature value of 40℃, it transmits a signal to the temperature control switch 15. After the temperature control switch 15 is automatically turned on, water flows out from the hot water user 3 into the main heat exchange inlet pipe 3-1, and then flows through the first to eighth heat exchange inlet pipes respectively. After exchanging heat with the summer phase change material 13, it flows through the first to eighth heat exchange return pipes and merges into the main heat exchange return pipe 3-2. Finally, it is heated by the hot water circulation pump 16 and sent to the hot water user 3.

[0040] In practical use, the system achieves heat accumulation regulation through the cross arrangement of energy pile group 4 and thermal storage pile group 5. Energy pile group 4 is connected to heat pump unit 2 via parallel pipelines to form a cooling cycle: after the heat pump starts, the medium is diverted from the main inlet pipe 2-1 to the PE pipeline inside each energy pile, and returns to the heat pump after exchanging heat with the soil through grouting material; thermal storage pile group 5 is connected to hot water users through independent pipelines to form a waste heat recovery cycle. When the critical temperature sensing device 14 (installed every 3 meters along the depth) inside the pile detects a temperature ≥40℃, the temperature control switch 15 triggers the hot water circulation pump 16 to start, pushing the water at the user end to flow through the PE heat exchange pipe inside the thermal storage pile to exchange heat with the summer phase change material 13. Both pile groups use steel fiber reinforced concrete pile bodies, with the energy piles containing vertical phase change tubes encapsulating inorganic phase change material 12, and the thermal storage pile cavity filled with summer phase change material 13. Through dual-cycle coordinated operation, the soil waste heat storage and reuse are achieved.

[0041] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A cold-dominated region energy pile group thermal accumulation adjustment system, characterized in that: It includes a pile group (1), a heat pump unit (2), a hot water user (3), a temperature control switch (15), and a hot water circulation pump (16); the pile group (1) consists of an energy pile group (4) and a thermal storage pile group (5) distributed in a cross pattern, wherein: the energy pile group (4) contains eight independent energy piles, each energy pile is equipped with an inlet pipe (6), a return pipe (7), grouting (10), a phase change pipe (11), and an inorganic phase change material (12), the phase change pipe (11) is set in the cavity of the energy pile, the inorganic phase change material (12) is encapsulated in the phase change pipe (11), and the grouting (10) fills the cavity between the phase change pipe (11) and the pile wall; the thermal storage pile group (5) contains eight independent thermal storage piles, Each thermal storage pile is equipped with a heat exchange inlet pipe (8), a heat exchange return pipe (9), a summer phase change material (13), and a critical temperature sensing device (14). The summer phase change material (13) is filled in the cavity inside the thermal storage pile, and the critical temperature sensing device (14) is arranged along the depth direction of the inner wall of the pile. The inlet pipe and return pipe of the energy pile group (4) are respectively connected in parallel to the condenser or evaporator circulation loop of the heat pump unit (2). The heat exchange inlet pipe and heat exchange return pipe of the thermal storage pile group (5) are respectively connected in parallel to the circulation loop of the hot water user (3). The temperature control switch (15) and the hot water circulation pump (16) are connected in series at the outlet end of the main heat exchange return pipe (3-2) of the thermal storage pile group (5).

2. The cold-dominated area energy pile group thermal accumulation regulation system according to claim 1, characterized in that: The energy pile group (4) includes a first energy pile (4-1), a second energy pile (4-2), a third energy pile (4-3), a fourth energy pile (4-4), a fifth energy pile (4-5), a sixth energy pile (4-6), a seventh energy pile (4-7), and an eighth energy pile (4-8). The water inlet pipe (6) of each energy pile is connected in parallel to the main water inlet pipe (2-1) and then connected to the condenser or evaporator outlet of the heat pump unit (2). The water return pipe (7) of each energy pile is connected in parallel to the main water return pipe (2-2) and then connected to the condenser or evaporator inlet of the heat pump unit (2).

3. The cold-dominated area energy pile group thermal accumulation regulation system according to claim 1, characterized in that: The thermal storage pile group (5) includes a first thermal storage pile (5-1), a second thermal storage pile (5-2), a third thermal storage pile (5-3), a fourth thermal storage pile (5-4), a fifth thermal storage pile (5-5), a sixth thermal storage pile (5-6), a seventh thermal storage pile (5-7), and an eighth thermal storage pile (5-8). The heat exchange inlet pipes (8) of each thermal storage pile are connected in parallel to the main heat exchange inlet pipe (3-1) and then connected to the outlet of the hot water user (3). The heat exchange return pipes (9) of each thermal storage pile are connected in parallel to the main heat exchange return pipe (3-2) and then connected to the inlet of the hot water user (3).

4. The cold-dominated area energy pile group thermal accumulation regulation system according to claim 1, characterized in that: The critical temperature sensing device (14) is connected to the temperature control switch (15) via signal connection.

5. The cold-dominated area energy pile group thermal accumulation regulation system according to claim 1, characterized in that: The pile bodies of the energy piles and heat storage piles are made of steel fiber reinforced concrete, and the water inlet pipe (6), water return pipe (7), heat exchange water inlet pipe (8) and heat exchange water return pipe (9) are all made of PE material.

6. The cold-dominated district energy pile group thermal accumulation regulating system according to claim 1, characterized in that: The phase change tube (11) of the energy pile is vertically arranged in the center of the pile body cavity, and the inorganic phase change material (12) is sealed inside the phase change tube (11).

7. The cold-dominated district energy pile group thermal accumulation regulating system according to claim 1, characterized in that: The critical temperature sensing device (14) of the thermal storage pile is arranged near the inner wall of the pile body, with several devices evenly spaced along the depth direction.

8. The cold-dominated district energy pile group thermal accumulation regulating system according to claim 1, characterized in that: The input end of the temperature control switch (15) is connected to the outlet of the main heat exchange return water pipe (3-2), and the output end is connected to the inlet of the hot water user (3) through the hot water circulation pump (16) to form a closed loop.

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