Multi-energy complementary phase change energy pile self-adjusting system
By introducing a multi-energy complementary self-regulation system of solar collectors and sky radiation plates into the phase change energy pile system, the problem of difficult phase state recovery of phase change materials is solved, and the energy efficiency of the system and the utilization rate of phase change materials are improved.
Patent Information
- Application Number
- CN202422136958.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-09-02
AI Technical Summary
The phase state recovery of phase change materials in traditional phase change energy piles is difficult and slow, resulting in low utilization of phase change materials, affecting system performance and operating efficiency.
The multi-energy complementary phase change energy pile self-regulation system is adopted, combined with solar collectors and sky radiation plates, and the phase change material phase change material phase change material is adjusted according to seasons and operating modes, and the soil temperature is monitored through temperature sensors to adjust soil thermal balance.
It effectively improves the recovery efficiency of phase change materials, reduces thermal cycle fatigue caused by overheating or supercooling, extends the service life of phase change materials and the stability of system performance, and reduces energy consumption and operating costs.
Smart Images
Figure CN222951251U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of ground source heat pumps, and in particular relates to a multi-energy complementary phase change energy pile self-regulating system. Background Art
[0002] The heat exchange capacity of traditional energy piles is limited, and the temperature change during the heat exchange process causes the pile body to expand and contract, which affects the stability of the upper building structure. This has limited the development and application of energy piles to a certain extent. Therefore, some scholars have proposed the concept of phase change energy piles, which uses the phase change heat absorption and heat release of phase change concrete to change the thermal response characteristics of energy piles, which can reduce the thermal impact range of the pile buried pipe heat absorption and heat release process on the soil around the pile, reduce the temperature change amplitude of the energy pile and the resulting thermal strain and deformation.
[0003] However, in the process of using phase change energy piles, the operation and recovery of phase change materials are the key links in this technology. Phase change energy piles need to make full use of the phase change latent heat of phase change materials to alleviate temperature changes, increase energy storage and reduce the additional temperature stress caused by temperature changes and the impact on the upper structure of the pile foundation. Therefore, phase change energy piles must adopt intermittent operation conditions to make the phase change material completely phase change during the operation period and complete the phase state recovery of the phase change material during the intermittent period, so as to give full play to the advantages of phase change materials. This not only requires optimizing the system operation and recovery time ratio, but also needs to consider the single-hole heat exchange, the time characteristics of the building load and the optimal ratio of phase change materials in winter and summer. It is a relatively complex multi-factor problem. It is difficult to achieve the phase change and phase state recovery of phase change materials in phase change energy piles to improve the utilization rate of phase change materials and give full play to the advantages of phase change energy piles. To this end, the utility model proposes a multi-energy complementary phase change energy pile self-regulating system using sky radiation panels and solar collectors, which opens different operation modes for different working conditions in winter and summer to improve the recovery efficiency of phase change materials. Utility Model Content
[0004] Purpose of the utility model: The utility model provides a multi-energy complementary phase change energy pile self-adjusting system to solve the problem that the phase state recovery of the phase change material of the traditional phase change energy pile is difficult and slow.
[0005] Technical solution: A multi-energy complementary phase-change energy pile self-regulating system, including a solar collector, a sky radiation panel, a phase-change energy pile body, a water pump and a heat pump unit;
[0006] The phase-change energy pile body is buried in the soil, and summer phase-change materials, winter phase-change materials and concrete are encapsulated inside the phase-change energy pile body; a heat exchange pipe and a buried pipe heat exchanger are buried inside the phase-change energy pile body; the outlet of the heat exchange pipe is connected to the inlet of the water pump, and the outlet of the water pump is connected to the inlet of the heat exchange pipe; a solar collector and a sky radiation panel are arranged between the outlet of the heat exchange pipe and the inlet of the water pump, and the solar collector and the sky radiation panel are arranged in parallel, and a first valve and a second valve are respectively arranged at the inlet of the sky radiation panel of the solar collector;
[0007] The heat pump unit includes a condenser and an evaporator; the outlet of the buried pipe heat exchanger is connected to the inlet of the condenser in the heat pump unit through a third valve and a fifth valve respectively; the inlet of the buried pipe heat exchanger is connected to the outlet of the evaporator in the heat pump unit through a fourth valve and a sixth valve respectively.
[0008] Furthermore, a plurality of first temperature sensors are provided in the summer phase change material and the winter phase change material, and the first temperature sensors are connected to the temperature collector via a temperature signal transmission line.
[0009] Furthermore, a plurality of second temperature sensors are arranged in the soil around the phase change energy pile body, and the second temperature sensors are connected to the temperature collector via a temperature signal transmission line.
[0010] Furthermore, a plurality of the first temperature sensors are evenly distributed in the summer phase change material and the winter phase change material.
[0011] Furthermore, a plurality of the second temperature sensors are evenly distributed in the soil around the phase change energy pile.
[0012] Furthermore, the surface of the sky radiation panel is provided with a coating with high reflectivity.
[0013] Furthermore, the heat exchange tube and the buried heat exchanger are U-shaped, W-shaped or spiral-shaped.
[0014] The utility model proposes a multi-energy complementary phase change energy pile self-regulating system, which has a simple system structure, clear use principle, and simple and easy operation mode. Its beneficial effects are:
[0015] (1) The utility model utilizes sky radiation panels and solar collectors to adjust the phase change and recovery process of phase change materials, which more effectively exerts the advantages of phase change materials, not only reducing thermal cycle fatigue caused by overheating or overcooling, but also extending the service life of phase change materials and system performance stability;
[0016] (2) The utility model uses sky radiation panels and solar collectors to regulate the temperature of the surrounding soil, allowing the soil temperature to recover quickly, preventing the soil from overheating or cooling, and maintaining a more stable geothermal environment;
[0017] (3) The utility model utilizes sky radiation panels and solar collectors to regulate the phase change and recovery process of phase change materials and the temperature of surrounding soil, making full use of free resources in nature, reducing traditional energy consumption, reducing long-term operating costs, and improving the comprehensive utilization efficiency of energy. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a schematic diagram of the structure of the self-regulating system of the multi-energy complementary phase-change energy pile;
[0019] Figure 2 This is a diagram showing the distribution of temperature sensors in the phase change material of the phase change energy pile and their connection with the temperature collector;
[0020] In the attached drawings, there are a solar collector (1), a sky radiation panel (2), a phase change energy pile (3), a heat exchange tube (3-1), a summer phase change material (3-2), a winter phase change material (3-3), a buried pipe heat exchanger (3-4), concrete (3-5), a first temperature sensor (4-1), a second temperature sensor (4-2), soil (5), a water pump (6), a first valve (7-1), a second valve (7-2), a third valve (7-3), a fourth valve (7-4), a fifth valve (7-5), a sixth valve (7-6), a heat pump unit (8), a condenser (8-1), an evaporator (8-2), and a temperature collector (9). DETAILED DESCRIPTION
[0021] The technical solution of the utility model is described in detail below with reference to the accompanying drawings, but the protection scope of the utility model is not limited to the embodiments.
[0022] Example 1
[0023] like Figure 1 and Figure 2 As shown, this embodiment provides a multi-energy complementary phase change energy pile self-regulating system, and the regulating system includes a solar collector 1, a sky radiation panel 2, a phase change energy pile body 3, a plurality of first temperature sensors 4-1, a plurality of second temperature sensors 4-2, soil 5, a water pump 6, a first valve 7-1, a second valve 7-2, a third valve 7-3, a fourth valve 7-4, a fifth valve 7-5, a sixth valve 7-6, a heat pump unit 8, a condenser 8-1, an evaporator 8-2 and a temperature collector 9.
[0024] The phase change energy pile body 3 is buried in the soil 5, and the summer phase change material 3-2, the winter phase change material 3-3 and the concrete 3-5 are encapsulated inside the phase change energy pile body 3; the heat exchange pipe 3-1 and the buried pipe heat exchanger 3-4 are buried in the phase change energy pile body 3;
[0025] The outlet of the heat exchange tube 3-1 is connected to the inlet of the water pump 6, and the outlet of the water pump 6 is connected to the inlet of the heat exchange tube 3-1; a solar collector 1 and a sky radiation panel 2 are arranged between the outlet of the heat exchange tube 3-1 and the inlet of the water pump 6, and the solar collector 1 and the sky radiation panel 2 are arranged in parallel, and a first valve 7-1 and a second valve 7-2 are respectively arranged at the inlet of the sky radiation panel 2 of the solar collector 1;
[0026] The outlet of the buried pipe heat exchanger 3-4 is connected to the inlet of the condenser 8-1 in the heat pump unit 8 through the third valve 7-3 and the fifth valve 7-5 respectively; the inlet of the buried pipe heat exchanger 3-4 is connected to the outlet of the evaporator 8-2 in the heat pump unit 8 through the fourth valve 7-4 and the sixth valve 7-6 respectively.
[0027] A plurality of first temperature sensors 4-1 are provided in the summer phase change material 3-2 and the winter phase change material 3-3; a plurality of second temperature sensors 4-2 are provided in the soil 5 surrounding the phase change energy pile body 3; a plurality of the first temperature sensors 4-1 are evenly distributed in the summer phase change material 3-2 and the winter phase change material 3-3 to monitor their temperatures; a plurality of the second temperature sensors 4-2 are evenly distributed in the soil 5 surrounding the phase change energy pile body 3 to monitor the soil temperature; the first temperature sensors 4-1 and the second temperature sensors 4-2 are connected to the temperature collector 9 via a temperature signal transmission line to automatically collect and display the temperatures of the summer phase change material 3-2, the winter phase change material 3-3 and the soil 5.
[0028] The surface of the sky radiation panel 2 is provided with a high reflectivity coating to enhance its radiation cooling effect during the day. For example, an acrylic coating is provided on the surface of the sky radiation panel, which can not only improve its thermal management and optical performance, but also protect the radiation panel from environmental damage.
[0029] The heat exchange pipe 3-1 and the buried pipe heat exchanger 3-4 buried inside the phase change energy pile body 3 can be any heat exchanger form such as U-type, W-type, spiral type, etc. that is convenient for construction and can improve system performance according to specific circumstances.
[0030] The summer phase change material 3-2 and the winter phase change material 3-3 encapsulated inside the phase change energy pile body 3 adopt a packaging form that is convenient for construction according to specific circumstances, and select phase change materials and proportions suitable for winter and summer operations according to actual project loads; for example, the summer phase change material 3-2 adopts stearic acid, and the winter phase change material 3-3 adopts paraffin. If the winter and summer loads required by the actual project are 1:1, then the ratio of winter and summer phase change materials can be 1:1.
[0031] The operation mode of the multi-energy complementary phase change energy pile self-regulating system is as follows:
[0032] 1) Winter operation mode: This operation mode mainly utilizes the supplementary heat of the solar collector 1 to regulate the recovery state of the phase change material 3-3 in winter to ensure that it completes phase recovery within the recovery period.
[0033] In this case:
[0034] The inlet and outlet of the underground heat exchanger 3-4 are respectively connected to the inlet and outlet of the evaporator 8-2 in the heat pump unit 8. During the operation period, the heat pump unit 8 is started, the third valve 7-3 and the fourth valve 7-4 are closed, the fifth valve 7-5 and the sixth valve 7-6 are opened, and the evaporator 8-2 in the heat pump unit 8 absorbs heat and extracts heat from the ground through the phase change energy pile body 3. After the temperature is raised, the heat is transported to the interior of the building through the condenser 8-1 for heating. In this process, the temperature of the phase change energy pile body 3 decreases. When its temperature is lower than the phase change temperature of the winter phase change material 3-3, the winter phase change material 3-3 undergoes a phase change from liquid to solid, and releases the phase change latent heat.
[0035] During the recovery period (the process of the winter phase change material 3-3 changing from solid to liquid), the heat pump unit 8 stops running, the temperature of the phase change energy pile body 3 gradually rises, and the temperature collector 9 continuously monitors and displays the temperature of the winter phase change material 3-3 through the first temperature sensor 4-1. When the temperature after recovery during the recovery period is still lower than its phase change temperature and the phase state recovery cannot be completed, the second valve 7-2 is closed, the first valve 7-1 is opened, and the water pump 6 is turned on. The circulating medium flowing through the heat exchange tube 3-1 is heated by the solar collector 1, and the phase change energy pile body 3 is supplemented with heat to increase the temperature of the winter phase change material 3-3. When the temperature of the winter phase change material 3-3 is higher than its phase change temperature, the phase change recovery is completed, and the water pump 6 is turned off. The first temperature sensor 4-1 in the winter phase change material 3-3 is used to continuously monitor the temperature of the phase change material to ensure that it is completely heated to a liquid state.
[0036] 2) Summer operation mode: This operation mode mainly utilizes the heat dissipation of the sky radiation panel 2 to regulate the recovery state of the phase change material 3-2 in summer to ensure that it completes phase recovery within the recovery period.
[0037] In this case:
[0038] The inlet and outlet of the underground heat exchanger 3-4 are respectively connected to the inlet and outlet of the condenser 8-1 in the heat pump unit 8. During the operation period, the heat pump unit 8 is started, valves 7-5 and 7-6 are closed, the third valve 7-3 and the fourth valve 7-4 are opened, and the evaporator 8-2 in the heat pump unit 8 extracts the heat in the building, and the heat is transferred to the ground through the phase change energy pile body 3 by the condenser 8-1. In this process, the temperature of the phase change energy pile body 3 rises, and when its temperature is higher than the phase change temperature of the summer phase change material 3-2, the summer phase change material 3-2 undergoes a phase change, from solid to liquid, and absorbs the phase change latent heat.
[0039] During the recovery period (the process of the summer phase change material 3-2 changing from liquid to solid), the heat pump unit 8 stops running, and the temperature collector 9 continuously monitors and displays the temperature of the summer phase change material 3-2 through the first temperature sensor 4-1. When the temperature is still higher than its phase change temperature after the recovery period, the first valve 7-1 is closed, the second valve 7-2 is opened, the water pump 6 is turned on, and the circulating medium flowing through the heat exchange tube 3-1 is cooled by the sky radiation panel 2 to reduce the temperature of the summer phase change material 3-2. When the temperature of the summer phase change material 3-2 is lower than its phase change temperature, the phase state recovery of the summer phase change material 3-2 is completed, and the water pump 6 is turned off. The first temperature sensor 4-1 in the summer phase change material 3-2 is used to continuously monitor the temperature of the phase change material to ensure that it is completely cooled to a solid state.
[0040] 3) Soil heat balance regulation operation mode: This operation mode mainly utilizes the supplementary heat from the solar collector 1 and the heat dissipation from the sky radiation panel 2 to regulate the soil heat balance and prevent the accumulation of cold and hot in the soil.
[0041] The temperature of the soil 5 is monitored by the temperature collector 9 through the second temperature sensor 4-2. After the heat pump unit 8 has been running for one year, when the temperature collector 9 detects that the temperature of the soil 5 is lower than the initial temperature of the soil, the second valve 7-2 is closed, the first valve 7-1 is opened, the water pump 6 is started, and the circulating medium is heated by the solar collector 1 to dissipate heat to the soil, thereby raising the soil temperature to the initial temperature; when the temperature collector 9 detects that the temperature of the soil 5 is higher than the initial temperature of the soil, the first valve 7-1 is closed, the second valve 7-2 is opened, the water pump 6 is started, and the circulating medium is cooled by the sky radiation panel 2 to absorb the heat of the soil and thereby reduce the soil temperature to the initial temperature.
[0042] The utility model can set different adjustment conditions for different phase change materials in winter and summer to improve the phase recovery efficiency of the phase change materials. At the same time, different operating conditions are turned on according to the soil temperature around the phase change energy pile monitored by the temperature sensor, which can effectively alleviate the soil thermal imbalance problem caused by the imbalance of cold and hot loads around the phase change energy pile. The utility model is of great significance for improving the heat exchange efficiency of the energy pile and improving the energy efficiency of the ground source heat pump system, and therefore has a wide range of application prospects.
[0043] As mentioned above, although the present invention has been shown and described with reference to a specific preferred embodiment, it should not be interpreted as limiting the present invention itself. Various changes may be made to the form and details without departing from the spirit and scope of the present invention.
Claims
1. A multi-energy complementary phase change energy pile self-adjusting system, characterized in that: It comprises a solar thermal collector (1), a sky radiation panel (2), a phase change energy pile (3), a water pump (6) and a heat pump unit (8); The phase-change energy pile body (3) is buried in the soil (5), and the phase-change energy pile body (3) is encapsulated with summer phase-change material (3-2), winter phase-change material (3-3) and concrete (3-5); a heat exchange pipe (3-1) and a buried pipe heat exchanger (3-4) are buried in the phase-change energy pile body (3); The outlet of the heat exchange tube (3-1) is connected to the inlet of the water pump (6), and the outlet of the water pump (6) is connected to the inlet of the heat exchange tube (3-1); a solar collector (1) and a sky radiation panel (2) are provided between the outlet of the heat exchange tube (3-1) and the inlet of the water pump (6); the solar collector (1) and the sky radiation panel (2) are arranged in parallel, and a first valve (7-1) and a second valve (7-2) are provided at the inlets of the solar collector (1) and the sky radiation panel (2), respectively; The heat pump unit (8) comprises a condenser (8-1) and an evaporator (8-2); the outlet of the ground pipe heat exchanger (3-4) is connected to the inlet of the condenser (8-1) in the heat pump unit (8) through a third valve (7-3) and a fifth valve (7-5) respectively; the inlet of the ground pipe heat exchanger (3-4) is connected to the outlet of the evaporator (8-2) in the heat pump unit (8) through a fourth valve (7-4) and a sixth valve (7-6) respectively.
2. According to claim 1, a multi-energy complementary phase change energy pile self-adjusting system is characterized in that: A plurality of first temperature sensors (4-1) are provided in both the summer phase change material (3-2) and the winter phase change material (3-3), and the first temperature sensors (4-1) are connected to a temperature collector (9) via a temperature signal transmission line.
3. A multi-energy complementary phase change energy pile self-adjusting system according to claim 1 or 2, characterized in that: A plurality of second temperature sensors (4-2) are arranged in the soil (5) surrounding the phase-change energy pile body (3), and the second temperature sensors (4-2) are connected to a temperature collector (9) via a temperature signal transmission line.
4. The multi-energy complementary phase change energy pile self-adjusting system according to claim 2 is characterized in that: A plurality of the first temperature sensors (4-1) are evenly distributed in the summer phase change material (3-2) and the winter phase change material (3-3).
5. The multi-energy complementary phase change energy pile self-adjusting system according to claim 3 is characterized in that: A plurality of the second temperature sensors (4-2) are evenly distributed in the soil (5) around the phase change energy pile (3).
6. The multi-energy complementary phase change energy pile self-adjusting system according to claim 1 is characterized in that: The surface of the sky radiation panel (2) is provided with a coating with high reflectivity.
7. The multi-energy complementary phase change energy pile self-adjusting system according to claim 1 is characterized in that: The heat exchange tube (3-1) and the buried tube heat exchanger (3-4) are U-shaped, W-shaped or spiral-shaped.