A heat pump energy system

Abstract

The utility model discloses a kind of heat pump energy systems, comprising: heat storage box, including high temperature layer, heat storage layer and low temperature layer being arranged in descending order along height direction;Heat storage layer is filled with heat storage phase change medium, and heat storage layer is respectively connected with high temperature layer and low temperature layer;High temperature layer is equipped with the liquid inlet line of liquid supply to heat pump assembly, and low temperature layer is equipped with the liquid return line of receiving heat pump assembly return liquid;Low temperature layer is equipped with auxiliary heating band;First heat source component, including first heat exchange piece, and first heat exchange piece is arranged in low temperature layer and is used to transfer the heat of first heat source piece to low temperature layer;Second heat source component, including second heat exchange piece, and second heat exchange piece is arranged in high temperature layer and is used to transfer the heat of second heat source component to high temperature layer.The utility model sets up high temperature layer, heat storage layer and low temperature layer in heat storage box, form layered structure, cooperate with the liquid inlet and liquid return circuit of heat pump assembly, realize the directional circulation of cold and hot fluid, avoid the temperature stratification failure problem caused by cold and hot water mixing in traditional water tank.

Description

Technical Field

[0001] This utility model relates to the field of heat pump technology, and in particular to a heat pump energy system. Background Technology

[0002] Heat pumps, as a technology that efficiently utilizes low-grade energy, have been widely applied in building heating, industrial hot water supply, and district heating. Existing heat pump systems mostly use a single heat source, such as air-source heat pumps or solar heat pumps, but their operation is easily affected by environmental conditions. In low-temperature winter environments, air-source heat pumps experience a significant decrease in evaporator heat exchange efficiency, severe frost formation, leading to fluctuations in water supply temperature and reduced energy efficiency. Solar heat pumps, on the other hand, face insufficient heat source during cloudy, rainy, or nighttime conditions, making it impossible to provide continuous and stable heating.

[0003] While existing heat storage devices can mitigate heat source fluctuations to some extent, most are single-tank systems, resulting in poor mixing of hot and cold water and inadequate temperature stratification. This leads to unstable inlet and outlet water temperatures on the evaporator side of the heat pump, affecting unit efficiency and operational reliability. Some solutions attempt to add coils or baffles, but temperature fluctuations are still difficult to avoid. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a heat pump energy system and temperature control method that can improve the temperature stability of the heat source.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A heat pump energy system, comprising a heat pump assembly for external heat supply, characterized in that it further comprises: A heat storage tank includes a high-temperature layer, a heat storage layer, and a low-temperature layer arranged in descending order along the height direction; the heat storage layer is filled with a heat storage phase change medium, and the heat storage layer is connected to the high-temperature layer and the low-temperature layer respectively; the high-temperature layer is provided with a liquid inlet pipe for supplying liquid to the heat pump assembly, and the low-temperature layer is provided with a liquid return pipe for receiving the liquid returned from the heat pump assembly; the low-temperature layer is provided with an auxiliary heating belt; A first heat source assembly includes a first heat exchanger, which is disposed in the low-temperature layer and is used to transfer the heat of the first heat source assembly to the low-temperature layer. The second heat source assembly includes a second heat exchanger, which is disposed on the high-temperature layer and is used to transfer heat from the second heat source assembly to the high-temperature layer.

[0006] In some embodiments, the heat storage phase change medium is provided with a water flow channel, which is connected to the high-temperature layer and the low-temperature layer respectively.

[0007] In some embodiments, the number of water flow channels is greater than or equal to two and they are evenly distributed in the heat storage phase change medium.

[0008] In some embodiments, the aperture of the water flow channel ranges from 2 to 4 cm.

[0009] In some embodiments, the first heat exchanger and the second heat exchanger are independent heat exchange coils.

[0010] In some embodiments, the phase change temperature of the heat storage phase change medium is in the range of 35-37 degrees Celsius.

[0011] In some embodiments, the heat storage phase change medium is paraffin-based.

[0012] In some implementations, a temperature sensor and a control center are also included; The temperature sensors are respectively located in the high-temperature layer, the heat storage layer, and the low-temperature layer and are used to detect the temperature of each layer; the control center is communicatively connected to the first heat source component, the second heat source component, and the temperature sensors, and the control center is used to receive the signals transmitted by the temperature sensors to adjust the operating status of the first heat source component and the second heat source component.

[0013] In some embodiments, a temperature sensor in the heat storage layer is used to detect the core temperature of the heat storage phase change medium.

[0014] In some embodiments, flow control valves are provided on the inlet pipeline and the return pipeline, respectively.

[0015] The beneficial effects of this invention are as follows: It provides a heat pump energy system that, by setting a high-temperature layer, a heat storage layer, and a low-temperature layer in the heat storage tank, forms a layered structure along the height direction. Combined with the inlet and outlet circuits of the heat pump components, it achieves directional circulation of hot and cold fluids, avoiding the temperature stratification failure problem caused by the mixing of hot and cold water in traditional water tanks. The heat storage layer is filled with a phase change material (PCM), utilizing its latent heat of phase change to absorb or release heat, significantly enhancing the system's buffering capacity. When the heating capacity of the first or second heat source component fluctuates, the PCM can automatically store or release heat within the phase change temperature range, thereby ensuring the stability of the water temperature in the high-temperature layer. In addition, an auxiliary heating belt is set in the low-temperature layer, which, under extreme weather conditions, works with the first heat source component to exchange heat in the low-temperature layer, preventing insufficient power from the first heat source component. In other words, this heat pump energy system utilizes the first heat source component to preferentially absorb low-grade ambient heat energy, and subsequently utilizes the second heat source component to exchange heat in the high-temperature layer, ensuring timely compensation of high-grade heat when the heat source is insufficient. This achieves dual-heat-source zoned synergy, improving the system's thermal energy utilization efficiency and operational stability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a heat pump energy system according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the heat storage phase change medium according to an embodiment of the present invention; Label Explanation: 1. Heat storage tank; 11. High temperature layer; 12. Heat storage layer; 121. Heat storage phase change medium; 122. Water flow channel; 13. Low temperature layer; 131. Auxiliary heating belt; 14. Liquid inlet pipe; 15. Liquid return pipe; 16. Temperature sensor; 2. First heat source assembly; 21. First heat exchanger; 3. Second heat source assembly; 31. Second heat exchanger; 4. Heat pump assembly. Detailed Implementation

[0017] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0018] In existing technologies, heat pumps, as a highly efficient energy utilization technology, utilize the reverse Carnot cycle principle to "transfer" heat from a low-temperature heat source to a high-temperature end, thereby achieving heating or cooling. Traditional heat pump systems typically rely on a single heat source, such as air-source heat pumps or ground-source heat pumps, and their operating efficiency and stability are often limited by external environmental conditions. Taking air-source heat pumps as an example, when the ambient temperature drops below 0°C, the evaporator's heat exchange capacity decreases significantly, easily leading to frost formation or even shutdown, resulting in reduced heating efficiency; while solar heat pumps face the problem of insufficient heat source during cloudy or rainy weather or at night. These factors all contribute to the significant shortcomings of single-source heat pump systems in terms of continuous and stable heating.

[0019] To at least solve the above problems, please refer to Figure 1 and Figure 2 An embodiment of this utility model provides a heat pump energy system, including a heat pump component 4 for external heat supply, and further comprising: The heat storage tank 1 includes a high-temperature layer 11, a heat storage layer 12, and a low-temperature layer 13 arranged in descending order along the height direction; the heat storage layer 12 is filled with a heat storage phase change medium 121, and the heat storage layer 12 is connected to the high-temperature layer 11 and the low-temperature layer 13 respectively; the high-temperature layer 11 is provided with an inlet pipe 14 for supplying liquid to the heat pump assembly 4, and the low-temperature layer 13 is provided with a return pipe 15 for receiving the return liquid from the heat pump assembly 4; the low-temperature layer 13 is provided with an auxiliary heating belt 131; The first heat source component 2 includes a first heat exchanger 21, which is disposed on the low temperature layer 13 and is used to transfer the heat of the first heat source component to the low temperature layer 13. The second heat source component 3 includes a second heat exchanger 31, which is disposed on the high temperature layer 11 and is used to transfer the heat of the second heat source component 3 to the high temperature layer 11.

[0020] As described above, the beneficial effects of this invention are as follows: By setting a high-temperature layer 11, a heat storage layer 12, and a low-temperature layer 13 in the heat storage tank 1, a layered structure along the height direction is formed. Combined with the liquid inlet and return circuits of the heat pump component 4, directional circulation of hot and cold fluids is achieved, avoiding the temperature stratification failure problem caused by the mixing of hot and cold water in traditional water tanks. The heat storage layer 12 is filled with a phase change material (PCM), utilizing its latent heat of phase change to absorb or release heat, significantly enhancing the system's buffering capacity. When the heating capacity of the first heat source component 2 or the second heat source component 3 fluctuates, the PCM can automatically store or release heat within the phase change temperature range, thereby ensuring the stability of the water temperature in the high-temperature layer 11. The first heat source component 2 exchanges heat in the low-temperature layer 13, preferentially absorbing low-grade ambient heat energy. The second heat source component 3 exchanges heat in the high-temperature layer 11, ensuring timely compensation of high-grade heat when the heat source is insufficient, achieving dual-heat source zoning and synergy, and improving the system's thermal energy utilization efficiency and operational stability.

[0021] In addition, an auxiliary heating belt 131 is set in the low-temperature layer 13 to cooperate with the first heat source component in heat exchange in the low-temperature layer under extreme weather conditions, so as to prevent insufficient power of the first heat source component.

[0022] Specifically, the first heat source component 2 is a solar collector, which heats the lower low-temperature zone of the hot water storage tank. The water in the tank decreases in density after being heated, rises through the intermediate heat storage layer 12, exchanges heat with the heat storage layer 12, and then enters the upper high-temperature zone. The second heat source component 3 is a low-temperature air-source heat pump unit, which is activated during extremely cold or rainy / snowy weather to supplement heat to the upper high-temperature zone of the hot water storage tank, maintaining a constant water temperature in the upper part of the tank and ensuring the inlet and outlet water requirements of the heat pump unit's evaporator side.

[0023] In some embodiments, the heat storage phase change medium 121 is provided with a water flow channel 122, which is connected to the high temperature layer 11 and the low temperature layer 13 respectively.

[0024] As described above, by providing water flow channels 122 in the heat storage phase change medium 121, the water flowing between the upper and lower layers can fully exchange heat with the phase change material when passing through the intermediate heat storage layer 12. On the one hand, the water flow channels 122 can avoid large-scale turbulence and maintain a good temperature gradient distribution; on the other hand, the water flow channels 122 and the phase change material form a surface-to-volume coupled heat exchange, which improves the heat exchange efficiency and makes the heat absorption or release process of the PCM faster and more uniform. This improves the response speed of heat storage and release and also ensures the temperature stability of the high-temperature layer 11. Specifically, the aperture of the water flow channels is in the range of 2-4 cm, preferably 3 cm.

[0025] In some embodiments, the number of water flow channels 122 is greater than or equal to two and they are evenly distributed in the heat storage phase change medium 121.

[0026] As described above, when the number of water flow channels 122 is greater than or equal to two and is evenly distributed in the phase change medium, the heat exchange area in contact with the water flow can be significantly increased, ensuring that water flow at different locations can exchange heat with the PCM, avoiding uneven local heat exchange or dead zones. The multi-channel arrangement improves the fluid circulation path within the entire water tank, enhances the overall heat transfer performance of the system, and thus makes the system's temperature control more precise and the heating supply more stable.

[0027] In some embodiments, the first heat exchanger 21 and the second heat exchanger 31 are independent heat exchange coils.

[0028] As described above, the first heat exchanger 21 and the second heat exchanger 31 are independent heat exchange coils, avoiding structural interference or cross-heating between the two heat sources. The independent coil design ensures that solar energy (or other low-temperature heat sources) and air source (or other high-temperature heat sources) function independently in different areas, and their start-up and shutdown can be flexibly controlled, enhancing the system's controllability and operating efficiency. Furthermore, the independence of the coils facilitates later maintenance and replacement, reducing the difficulty of system maintenance.

[0029] Specifically, both the first heat exchanger 21 and the second heat exchanger 31 are spiral coils. The spiral design further enhances the heat transfer area between the heat exchanger tube and the liquid, thereby improving the heat transfer efficiency.

[0030] In some embodiments, the phase change temperature of the heat storage phase change medium 121 is in the range of 35-37 degrees Celsius.

[0031] As described above, by limiting the phase change temperature range of the phase change material to 35-37℃, the requirements of the heat pump evaporator side for the inlet water temperature (approximately 32-37℃) can be precisely matched. This temperature range ensures that the PCM can fully utilize its heat storage and release functions during normal operation, while maintaining the stability of the outlet water temperature at the heating end of the system, avoiding a sudden drop in energy efficiency. This range selection takes into account both the physical properties of the PCM and the operating conditions of the heat pump, improving energy utilization efficiency.

[0032] In some embodiments, the low-temperature layer 13 is further provided with an auxiliary heating belt.

[0033] As described above, adding an auxiliary heating belt to the low-temperature layer 13 can provide bottom antifreeze and heat replenishment functions in extreme environments (such as when the ambient temperature is too low in winter), preventing damage to the equipment or affecting circulation due to ice formation in the low-temperature layer 13. Preferably, the auxiliary heating belt is linked with a temperature sensor, which can automatically activate when the temperature is detected to be lower than a preset value, achieving intelligent antifreeze and operational safety assurance.

[0034] In some embodiments, the heat storage phase change medium 121 is paraffin-based.

[0035] As described above, using paraffin-based phase change materials (PCMs) as the heat storage medium offers advantages such as high thermal stability, large latent heat of phase change, and low cost. Paraffin-based PCMs can maintain a constant temperature for heat release near the phase change point, buffering heat source fluctuations. Furthermore, they are chemically stable, do not corrode pipelines, and are suitable for long-term operation. This material choice further enhances the system's reliability and economy.

[0036] In some implementations, a temperature sensor and a control center are also included; The temperature sensor 16 is respectively disposed on the high temperature layer 11, the heat storage layer 12 and the low temperature layer 13 and is used to detect the temperature of each layer; the control center is communicatively connected to the first heat source component 2, the second heat source component 3 and the temperature sensor respectively, and the control center is used to receive the signal transmitted by the temperature sensor to adjust the operating status of the first heat source component and the second heat source component.

[0037] As described above, by installing temperature sensors in the high-temperature layer 11, the heat storage layer 12, and the low-temperature layer 13, and coordinating with the control center to acquire data and execute control logic, the temperature distribution inside the heat storage tank can be monitored in real time. Based on the information from the temperature sensors, the control center can automatically adjust the operating status of the first and second heat source components, thus avoiding indiscriminate starting and stopping of the heat sources. This design not only ensures the stability of the heating temperature but also enables intelligent energy distribution under different operating conditions, giving the system adaptive operation capabilities and improving overall energy efficiency and operational reliability.

[0038] In some embodiments, the temperature sensor 16 in the heat storage layer is used to detect the core temperature of the heat storage phase change medium.

[0039] As described above, by arranging temperature sensors in the heat storage layer to detect the core temperature of the phase change medium, the heat storage and release state of the phase change medium (such as solid, phase change process, or liquid) can be accurately determined. This detection method allows the system to dynamically monitor the heat storage capacity and remaining heat release capacity of the phase change material during operation, providing a basis for the control center to optimize the heat source start-up and shutdown logic. When the phase change material is detected to be in the heat release stage, the activation of the second heat source component can be delayed; when the phase change material is in the heat absorption stage, the first heat source component can be used for heating first. This can further buffer external heat source fluctuations, reduce unnecessary operation of auxiliary heat sources, and improve the energy efficiency and stability of the system.

[0040] In some embodiments, flow control valves are provided on the inlet pipeline and the return pipeline, respectively.

[0041] As described above, by installing flow control valves on both the inlet and return lines, precise regulation of the circulating flow between the heat pump components and the heat storage tank can be achieved. The introduction of these flow control valves allows the system to flexibly adjust the water flow rate and circulation volume according to different load demands or temperature changes, thereby regulating the heating power and heat exchange efficiency. This method not only ensures the stability of the high-temperature layer's outlet water temperature but also avoids energy loss due to excessive flow or insufficient heating due to insufficient flow. Furthermore, dynamic flow control can form a closed-loop regulation mechanism with temperature feedback, making the system operation more intelligent and efficient.

[0042] Please refer to Figure 1 and Figure 2 One embodiment of this utility model is as follows: A heat pump energy system. The system includes a heat pump assembly 4 for external heating, and also includes a heat storage tank 1, a first heat source assembly 2, and a second heat source assembly 3.

[0043] The heat storage tank 1 is arranged sequentially along its height as a high-temperature layer 11, a heat storage layer 12, and a low-temperature layer 13. The heat storage layer 12 is filled with a paraffin-based heat storage phase change medium 121, and is connected to both the high-temperature layer 11 and the low-temperature layer 13. The high-temperature layer 11 is equipped with an inlet pipe 14 for supplying liquid to the heat pump assembly 4, and the low-temperature layer 13 is equipped with a return pipe 15 for receiving the return liquid from the heat pump assembly 4. Flow control valves are installed on both the inlet and return pipes. This structure creates a clear temperature stratification layout, ensuring that the liquid circulation in the high-temperature and low-temperature zones does not interfere with each other, thus avoiding the temperature stratification failure problem caused by the mixing of hot and cold water in traditional water tanks.

[0044] The first heat source assembly 2 includes a first heat exchanger 21 disposed in the low-temperature layer 13 for transferring heat from the first heat source to the low-temperature layer 13. In a preferred embodiment, the first heat source is a solar collector, and the first heat exchanger 21 adopts a spiral coil structure, allowing solar-heated low-temperature water to enter the low-temperature layer 13, gradually pass through the heat storage layer 12 by floating due to density difference, fully exchange heat with the phase change material, and then enter the high-temperature layer 11.

[0045] The second heat source assembly 3 includes a second heat exchanger 31 arranged in the high-temperature layer 11, used to transfer heat from the second heat source to the high-temperature layer 11. In a specific embodiment, the second heat source is a low-temperature air source heat pump unit, and the second heat exchanger 31 also adopts a spiral coil structure. When the external environment is in extremely low temperature or rainy weather, the air source heat pump unit starts up, directly supplementing heat to the high-temperature layer 11, thereby maintaining a constant water temperature in the high-temperature layer 11 and ensuring stable inlet and outlet water temperatures on the evaporator side of the heat pump assembly 4. The first heat exchanger 21 and the second heat exchanger 31 are coils arranged independently of each other, avoiding structural interference and heat cross-influence between the two heat sources, enabling different heat sources to work efficiently in their respective areas, and facilitating later maintenance and replacement.

[0046] The phase change temperature range of the heat storage phase change medium 121 is controlled between 35 and 37 degrees Celsius, preferably 37 degrees Celsius. When the temperature of the rising water in the low-temperature layer 13 is higher than 37 degrees Celsius, the paraffin-based phase change material absorbs residual heat and melts; when the water temperature is lower than 37 degrees Celsius, the paraffin-based phase change material releases latent heat and solidifies, thus playing a buffering role in heat storage and heat release within the phase change range. Through this design, the requirements of the heat pump evaporator side for the inlet water temperature can be precisely matched, ensuring the stability of the outlet water temperature at the heating end while avoiding a sudden drop in energy efficiency.

[0047] A water flow channel 122 is provided in the heat storage phase change medium 121, connecting the high-temperature layer 11 and the low-temperature layer 13 respectively. This design allows the rising water from the low-temperature layer 13 to fully exchange heat with the phase change material as it passes through the intermediate heat storage layer 12, while avoiding turbulence and maintaining a good temperature gradient distribution. Preferably, there are at least two water flow channels 122, evenly distributed within the phase change medium, to increase the overall heat exchange area and uniformity, prevent the formation of local dead zones, and thus make heat transfer more efficient and stable.

[0048] The low-temperature layer 13 is also equipped with an auxiliary heating belt. When the ambient temperature is too low, the auxiliary heating belt can be automatically activated when the temperature sensor detects that the temperature of the low-temperature layer 13 is lower than the preset threshold, providing bottom heating function for the low-temperature layer 13, effectively preventing freezing and ensuring the safety of the circulation loop.

[0049] Temperature sensors 16 are respectively installed in the high-temperature layer 11, the heat storage layer 12, and the low-temperature layer 13 to detect the temperature of each layer. The control center is communicatively connected to the first heat source component, the second heat source component, and the temperature sensors. The control center receives signals transmitted by the temperature sensors to adjust the operating status of the first and second heat source components. The temperature sensors in the heat storage layer are used to detect the core temperature of the heat storage phase change medium. By arranging temperature sensors in the heat storage layer to detect the core temperature of the heat storage phase change medium, the heat storage and release state of the phase change medium (such as solid, phase change process, or liquid) can be accurately determined. This detection method enables the system to dynamically grasp the heat storage capacity and remaining heat release capacity of the phase change material during operation, providing a basis for the control center to optimize the heat source start-up and shutdown logic. When the phase change material is detected to be in the heat release stage, the activation of the second heat source component can be delayed; when the phase change material is in the heat absorption stage, the first heat source component can be used for heating first. This can further buffer external heat source fluctuations, reduce unnecessary operation of auxiliary heat sources, and improve the energy efficiency and stability of the system.

[0050] Through the above structural design, the heat pump energy system of this embodiment can maintain high efficiency and stability under various operating conditions. The solar collector prioritizes heating the low-temperature layer 13, while the air-source heat pump unit starts when solar energy is insufficient or the ambient temperature is low to supplement heat to the high-temperature layer 11. The paraffin-based phase change material stores and releases heat within the phase change temperature zone, playing a buffering and regulating role. The water flow channel 122 maintains a good temperature gradient and heat exchange uniformity. The auxiliary heating belt provides low-temperature protection. The system as a whole can achieve dual heat source zone coordination, improved energy efficiency ratio, and enhanced heating stability, making it particularly suitable for scenarios with high requirements for stability and efficiency, such as district heating, industrial process hot water, and emergency energy stations.

[0051] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A heat pump energy system comprising a heat pump assembly for supplying heat to the outside, characterized in that, Also includes: A heat storage tank includes a high-temperature layer, a heat storage layer, and a low-temperature layer arranged in descending order along the height direction; the heat storage layer is filled with a heat storage phase change medium, and the heat storage layer is connected to the high-temperature layer and the low-temperature layer respectively; the high-temperature layer is provided with a liquid inlet pipe for supplying liquid to the heat pump assembly, and the low-temperature layer is provided with a liquid return pipe for receiving the liquid returned from the heat pump assembly; the low-temperature layer is provided with an auxiliary heating belt; A first heat source assembly includes a first heat exchanger, which is disposed in the low-temperature layer and used to transfer heat from the first heat source assembly to the low-temperature layer. The second heat source assembly includes a second heat exchanger, which is disposed on the high-temperature layer and is used to transfer heat from the second heat source assembly to the high-temperature layer.

2. A heat pump energy system according to claim 1, characterized in that: The heat storage phase change medium is provided with a water flow channel, which is connected to the high-temperature layer and the low-temperature layer respectively.

3. A heat pump energy system according to claim 2, wherein: The number of water flow channels is greater than or equal to two and they are evenly distributed in the heat storage phase change medium.

4. A heat pump energy system according to claim 2, wherein: The diameter of the water flow channel ranges from 2 to 4 cm.

5. A heat pump energy system according to claim 1, wherein: The first heat exchanger and the second heat exchanger are independent heat exchange coils.

6. A heat pump energy system according to claim 1, wherein: The phase change temperature of the heat storage phase change medium is in the range of 35-37 degrees Celsius.

7. A heat pump energy system according to claim 1, wherein: The heat storage phase change medium is paraffin-based.

8. A heat pump energy system according to any one of claims 1 to 7, characterized in that: It also includes temperature sensors and a control center; The temperature sensors are respectively located in the high-temperature layer, the heat storage layer, and the low-temperature layer and are used to detect the temperature of each layer; the control center is communicatively connected to the first heat source component, the second heat source component, and the temperature sensors, and the control center is used to receive the signals transmitted by the temperature sensors to adjust the operating status of the first heat source component and the second heat source component.

9. A heat pump energy system according to claim 8, wherein: The temperature sensor in the heat storage layer is used to detect the core temperature of the heat storage phase change medium.

10. A heat pump energy system according to any one of claims 1 to 7, characterized in that: The inlet pipe and the return pipe are each equipped with a flow control valve.

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