Air energy device with built-in phase change energy accumulator

Abstract

The utility model provides an air energy device with a built-in phase change energy accumulator, which relates to the technical field of new energy and energy conservation and environmental protection, and comprises an inverter compressor, a phase change energy accumulator, a phase change energy accumulator and a phase change energy accumulator, the condenser is connected with the inverter compressor, condenses the high-temperature and high-pressure gaseous refrigerant into a liquid refrigerant and releases heat; the phase change energy storage device is connected with the condenser and receives and stores the heat released by the condenser; and the liquid storage tank is connected with the condenser and is used for storing a liquid refrigerant. The utility model can reduce the installation volume, reduce the installation and maintenance cost, provide defrosting energy for air energy equipment, save the electricity consumption during defrosting, and promote the popularization and application of clean energy.

Description

Technical Field

[0001] This utility model relates to the field of new energy and energy conservation and environmental protection technology, and in particular to an air source heat pump device with a built-in phase change energy storage device. Background Technology

[0002] Traditional air source heat pump devices face a series of challenges:

[0003] First, the installation process of air source heat pump systems is relatively complex, requiring various accessories that occupy a significant amount of space. In particular, the introduction of a buffer water tank, while providing the necessary energy for defrosting, often becomes a major obstacle due to its large size. In confined spaces such as apartment buildings, the limited space for air conditioners makes it impossible to install both air source heat pumps and buffer water tanks simultaneously. This forces many users to abandon air source heat pumps as a clean energy source for heating and cooling, opting instead for other, more energy-intensive devices.

[0004] Secondly, the presence of buffer tanks not only increases installation difficulty and cost but also limits the application of air source heat pumps in more scenarios. Especially against the backdrop of promoting clean energy and improving heating efficiency, buffer tanks have become a major industry barrier for air source heat pumps in high-rise buildings, seriously affecting the popularization of clean energy and the heating needs of a large number of users. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide an air source heat pump device with a built-in phase change energy storage device, which can not only meet the energy demand of air source defrosting, but also reduce the installation volume and reduce installation and maintenance costs.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0007] An air source heat pump device with a built-in phase change energy storage unit includes:

[0008] Variable frequency compressors are used to compress refrigerants to produce high-temperature, high-pressure gaseous refrigerants;

[0009] The condenser, connected to the variable frequency compressor, condenses the high-temperature, high-pressure gaseous refrigerant into liquid refrigerant and releases heat.

[0010] A phase change energy storage device is connected to the condenser to receive and store the heat released by the condenser;

[0011] A liquid storage tank, connected to the condenser, stores liquid refrigerant;

[0012] The throttling device includes a first throttling device and a second throttling device, used to regulate the flow rate and pressure of the refrigerant, wherein one end of the second throttling device is connected to the liquid storage tank;

[0013] One end of the evaporator is connected to one end of the first throttling device, causing the liquid refrigerant to evaporate into gaseous refrigerant and absorb heat;

[0014] An intelligent electronic control device controls the variable frequency compressor and the second throttling device.

[0015] Furthermore, the variable frequency compressor is connected to the gas-liquid separator, and the gas-liquid separator is connected to the other end of the evaporator.

[0016] Furthermore, the phase change energy storage device has an outlet pipe connection on its water circulation pipe.

[0017] Furthermore, one end of the first throttling device is connected to the economizer, and the other end of the second throttling device is connected to the economizer.

[0018] Furthermore, a water pump is provided on the water circulation pipe to drive water or antifreeze to circulate in the water circulation pipe, and the water pump is connected to the water inlet pipe interface; the water inlet pipe interface is connected to the condenser.

[0019] Furthermore, a variable frequency fan is provided near the evaporator to promote airflow through the evaporator by adjusting the fan speed and air volume.

[0020] Furthermore, the inlet pipe connector is connected to the water supply pipe of the fan coil unit, and the outlet pipe connector is connected to the water supply pipe of the underfloor heating system. Users can select and switch between using the fan coil unit or the underfloor heating system as needed.

[0021] The above-described solution of this utility model has at least the following beneficial effects:

[0022] By incorporating a built-in phase change energy storage device, the traditional bulky buffer water tank is replaced, reducing the installation size of the equipment and making it easier to install in space-constrained locations, such as inside buildings. The built-in phase change energy storage design simplifies the installation process, reduces the number of accessories, thereby lowering installation and maintenance costs and improving the equipment's economic efficiency.

[0023] Phase change energy storage devices (PCEs) can effectively store and release heat from condensers, providing energy for defrosting equipment without the need for additional electric auxiliary heating devices. Compared to direct electric auxiliary heating, PCEs are more energy-efficient, have a higher COP (Coefficient of Performance), and save electricity during defrosting.

[0024] This design solves the industry challenge of bringing air-source heat pumps to buildings and helps promote the widespread application of clean energy in more fields. Attached Figure Description

[0025] Figure 1 This is a front view of an air source heat pump device with a built-in phase change energy storage provided in an embodiment of this utility model.

[0026] Explanation of reference numerals in the attached diagram: 1. Variable frequency compressor; 2. Condenser; 3. Phase change energy storage device; 4. Liquid storage tank; 5. First throttling device; 6. Evaporator; 7. Variable frequency fan; 8. Second throttling device; 9. Intelligent electronic control device; 10. Economizer; 11. Water pump; 12. Gas-liquid separator; 13. Outlet water pipe connection; 14. Inlet water pipe connection; 15. Fan coil unit; 16. Underfloor heating. Detailed Implementation

[0027] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0028] like Figure 1 As shown, an embodiment of this utility model proposes an air source heat pump device with a built-in phase change energy storage unit, comprising:

[0029] Variable frequency compressor 1 is used to compress refrigerant to produce high temperature and high pressure gaseous refrigerant;

[0030] Condenser 2, connected to the variable frequency compressor 1, condenses the high-temperature and high-pressure gaseous refrigerant into liquid refrigerant and releases heat;

[0031] Phase change energy storage device 3 is connected to the condenser 2 to receive and store the heat released by the condenser 2;

[0032] Liquid storage tank 4 is connected to the condenser 2 and stores liquid refrigerant;

[0033] The throttling device includes a first throttling device 5 and a second throttling device 8, which are used to regulate the flow rate and pressure of the refrigerant, wherein one end of the second throttling device 8 is connected to the liquid storage tank 4.

[0034] One end of the evaporator 6 is connected to one end of the first throttling device 5, so that the liquid refrigerant evaporates into gaseous refrigerant and absorbs heat;

[0035] The intelligent electronic control device 9 controls the variable frequency compressor 1 and the second throttling device 8.

[0036] In this embodiment of the invention, the variable frequency compressor 1 starts and compresses the refrigerant to produce a high-temperature and high-pressure gaseous refrigerant. This high-temperature and high-pressure gaseous refrigerant then enters the condenser 2, where it condenses into a liquid refrigerant and releases a large amount of heat in the process.

[0037] The released heat is received and stored by the phase change energy storage device 3, which contains phase change materials. These materials can store and release a large amount of heat energy during solid-liquid transition. Therefore, when the condenser releases heat, the phase change materials absorb this heat and complete the phase change process from solid to liquid. Simultaneously, the liquid refrigerant is stored in the liquid storage tank 4. When it is necessary to adjust the refrigerant flow rate and pressure, the first throttling device 5 and the second throttling device 8 begin to operate. The second throttling device 8 is connected to the liquid storage tank 4, and its opening is adjusted to control the amount of liquid refrigerant entering the evaporator.

[0038] After passing through the first throttling device 5, the pressure and temperature of the liquid refrigerant decrease, and then it enters one end of the evaporator 6. In the evaporator, the liquid refrigerant evaporates into gaseous refrigerant and absorbs heat from the surrounding environment. This process achieves the purpose of extracting heat from the environment.

[0039] The entire system is precisely controlled by an intelligent electronic control device 9. This device coordinates the working status of each component based on the set heating demand and water temperature to ensure the system operates efficiently and stably. In particular, when the unit needs to defrost, the intelligent electronic control device will activate the corresponding program to provide energy for the defrosting process using the heat stored in the phase change energy storage device.

[0040] By incorporating a built-in phase change energy storage device, the heat released by the condenser is effectively utilized and stored in the phase change material. This not only reduces energy waste but also improves the overall energy efficiency of the system. During defrosting, the stored heat provides energy for the defrosting process, further saving electricity. The built-in phase change energy storage design reduces the number and size of external accessories, making the installation of air source heat pumps simpler and faster. This is particularly suitable for scenarios with limited space, such as buildings, providing users with more installation options. The application of intelligent electronic control devices enables the system to be precisely controlled according to actual needs, improving the system's stability and reliability. At the same time, the intelligent operating interface facilitates user operation and maintenance. As a clean energy device, air source heat pumps with built-in phase change energy storage do not produce pollutant emissions during operation. Their high efficiency and energy saving characteristics also help reduce energy consumption and carbon emissions, promoting green and sustainable development.

[0041] like Figure 1 As shown, the variable frequency compressor 1 is connected to the gas-liquid separator 12, and the gas-liquid separator 12 is connected to the other end of the evaporator 6.

[0042] In this embodiment of the invention, the variable frequency compressor 1 plays a crucial role in compressing the refrigerant and increasing its temperature and pressure. The compressed, high-temperature, high-pressure gaseous refrigerant is then sent to the condenser 2 for condensation and heat release. However, during the refrigerant circulation process, a mixture of liquid and gaseous refrigerant may be generated due to various reasons (such as pressure changes in the pipeline, temperature fluctuations, etc.). To ensure the normal operation and high efficiency of the system, this mixture needs to be separated to prevent liquid refrigerant from entering the compressor and causing damage.

[0043] At this point, the gas-liquid separator 12 plays a crucial role. Connecting the variable frequency compressor 1 and the evaporator 6, it forms a closed-loop refrigerant circulation path. When the mixture containing liquid refrigerant is discharged from the variable frequency compressor 1, it first enters the gas-liquid separator 12. Inside the gas-liquid separator, due to gravity and fluid dynamics, the liquid refrigerant is separated and deposited at the bottom, while the gaseous refrigerant continues to rise and enters the other end of the evaporator 6 through the outlet pipe.

[0044] In evaporator 6, the gaseous refrigerant absorbs heat again and evaporates back into a gaseous state, thus completing a complete refrigeration cycle. The separated liquid refrigerant can then be reintroduced into other parts of the system (such as liquid receiver 4) through a specific return pipe so that it can be reused when needed.

[0045] The presence of a gas-liquid separator effectively prevents liquid refrigerant from entering the variable frequency compressor, thus avoiding the risk of compressor damage due to liquid slugging. This extends the compressor's lifespan and improves the stability and reliability of the entire system. By ensuring that only gaseous refrigerant enters the evaporator, the gas-liquid separator helps maintain stable pressure and temperature conditions inside the evaporator, which helps improve the evaporator's heat exchange efficiency and allows the system to utilize energy more efficiently. The gas-liquid separator also promotes the circulation and reuse of refrigerant within the system. By separating liquid refrigerant and reintroducing it into the system, refrigerant waste and loss can be reduced, thereby improving the overall energy efficiency of the system. Air source heat pumps with built-in gas-liquid separators can better adapt to various operating conditions and load changes. Whether in high-temperature and high-humidity environments or low-temperature and dry conditions, the system can maintain stable operating performance and provide users with a comfortable indoor environment.

[0046] like Figure 1 As shown, the water circulation pipe of the phase change energy storage device 3 is provided with a water outlet pipe connection 13.

[0047] In this embodiment of the invention, the water outlet pipe connector 13 is located on the water circulation pipe of the phase change energy storage device 3, playing a crucial role in connecting the phase change energy storage device with other parts of the air source heat pump (such as underfloor heating, fan coil units, and other heat dissipation devices). When the device starts heating, water or antifreeze enters from the inlet of the phase change energy storage device under the drive of the circulation pump, flows through the phase change material layer and absorbs the heat stored therein, and then flows out through the water outlet pipe connector 13, entering the heat dissipation device of the air source heat pump to transfer heat to the indoor environment, thereby achieving heating.

[0048] When the unit needs defrosting, the outlet pipe connection 13 also plays an important role. At this time, indoor return water or antifreeze enters the phase change energy storage unit through the outlet pipe connection. As it flows through the phase change material, it absorbs the heat released by the material to raise its own temperature. It then enters the condenser for heat exchange, providing energy for defrosting the finned evaporator. After defrosting is completed, the water or antifreeze is reheated and flows through the phase change energy storage unit to store heat for the next use.

[0049] The outlet pipe connection 13 allows water or antifreeze to circulate smoothly between the phase change energy storage unit and the heat dissipation device, thereby improving heat transfer efficiency. This helps to accelerate the rise in indoor temperature and enhance user comfort. The outlet pipe connection 13 allows users to connect different heat dissipation devices (such as underfloor heating, fan coil units, etc.) according to actual needs, enhancing the system's flexibility and adaptability. This provides users with more choices and convenience. During defrosting, the outlet pipe connection 13 allows indoor return water or antifreeze to easily enter the phase change energy storage unit to absorb heat, thereby improving the efficiency and speed of the defrosting process. This helps reduce the impact of defrosting time on indoor temperature and improves the overall performance of the system. The standardized design of the outlet pipe connection 13 makes equipment installation and maintenance simpler and faster. Users can easily achieve normal operation and efficient heating without complex pipe connections and debugging.

[0050] like Figure 1 As shown, one end of the first throttling device 5 is connected to the economizer 10, and the other end of the second throttling device 8 is connected to the economizer 10.

[0051] In this embodiment of the invention, the connection between the first throttling device 5 and the second throttling device 8 and the economizer 10 constitutes an important link in the refrigerant circulation path. The economizer, also known as a plate heat exchanger, is a highly efficient heat exchange device used to achieve heat transfer between different states of the refrigerant.

[0052] Specifically, after the high-temperature, high-pressure gaseous refrigerant is discharged from the variable frequency compressor 1, it first enters the condenser 2 for condensation and heat release. The condensed liquid refrigerant then enters the liquid receiver 4 for storage. When needed, the liquid refrigerant is throttled and depressurized through the first throttling device 5, reducing its temperature and pressure. At this time, a portion of the refrigerant (referred to as the economic flow) is introduced into the economizer 10 through a connection therein, where it exchanges heat with another stream of refrigerant (referred to as the main flow) within the economizer.

[0053] In the economizer, the mainstream refrigerant is cooled by the economizer flow, thereby lowering its temperature and pressure and transforming it into a state more suitable for evaporation. Simultaneously, the economizer flow absorbs heat from the mainstream refrigerant, causing its temperature to rise, but it remains in a liquid or gas-liquid mixed state. Subsequently, the economizer flow undergoes further throttling and pressure reduction through the second throttling device 8, further lowering its temperature and pressure, and is ready to enter the evaporator 6 for evaporation and heat absorption.

[0054] After being cooled by the economizer, the mainstream refrigerant evaporates more easily in the evaporator, thereby improving the heat exchange efficiency of the evaporator and the overall energy efficiency of the system. The evaporated gaseous refrigerant is then drawn back into the variable frequency compressor 1 to begin a new cycle.

[0055] Through the heat exchange function of the economizer, the mainstream refrigerant is further cooled before entering the evaporator, reducing its evaporation temperature and pressure, thereby improving the evaporator's heat exchange efficiency. This helps the system achieve higher heating performance with lower energy consumption. The use of the economizer makes the refrigerant circulation in the system more stable and reliable. By adjusting the refrigerant flow rate of the economic flow and the mainstream flow, precise control of the system's cooling / heating capacity can be achieved, thus meeting the needs under different operating conditions. The economizer recovers and utilizes the heat of the mainstream refrigerant to heat the economic flow refrigerant, realizing the recycling and energy recovery of the refrigerant. This reduces refrigerant waste and loss, improving the overall energy efficiency and environmental performance of the system. Air source heat pumps with built-in economizers can adapt to more diverse operating conditions and load changes. Whether in low-temperature or high-temperature and high-humidity environments, the system can maintain stable operating performance and provide users with a comfortable indoor environment. In addition, this design also allows the equipment to restore heating capacity more quickly during defrosting, improving user satisfaction.

[0056] like Figure 1 As shown, a water pump 11 is provided on the water circulation pipe to drive water or antifreeze to circulate in the water circulation pipe, and the water pump 11 is connected to the water inlet pipe connector 14; the water inlet pipe connector 14 is connected to the condenser 2.

[0057] In this embodiment of the invention, the water pump 11 is connected to the condenser 2 via the water inlet pipe connector 14, forming a complete water circulation path. When the equipment starts running, the water pump 11 starts and generates power, driving water or antifreeze to enter the condenser 2 from the water inlet pipe connector 14. In the condenser, the water or antifreeze absorbs the heat released by the condensation of the high-temperature, high-pressure gaseous refrigerant, and its temperature rises accordingly.

[0058] The heated water or antifreeze then flows out of the condenser and into the phase change energy storage unit 3. Inside the phase change energy storage unit, the water or antifreeze comes into contact with the phase change material through pipes, transferring heat to the phase change material and causing it to undergo a phase change, thereby storing heat. After the heat storage is completed, the water or antifreeze continues to circulate under the drive of the water pump 11, and releases the heat to the indoor environment through heat dissipation devices (such as underfloor heating, fan coil units, etc.) to achieve heating.

[0059] When the unit needs to defrost, the direction of water flow in the water circulation pipe may be adjusted. At this time, indoor return water or antifreeze enters the condenser through a specific pipe for heat exchange, providing energy for defrosting the finned evaporator. After defrosting is completed, the water or antifreeze is heated again and flows through the phase change energy storage device to store heat for the next use.

[0060] The driving action of water pump 11 ensures high-speed and stable flow of water or antifreeze in the pipeline, thereby improving the efficiency of heat transfer from the condenser to the phase change energy storage device and then to the heat dissipation device. This helps to accelerate the rise in indoor temperature and improve user comfort. The continuous operation of water pump 11 helps maintain stable pressure within the water circulation pipeline, avoiding system instability caused by pressure fluctuations within the pipeline. Simultaneously, the driving action of the water pump ensures that the system maintains efficient operation under various working conditions. Precise control of water pump 11 allows for precise adjustment of the water or antifreeze flow rate, thereby optimizing energy utilization. When more heat is needed, the water flow rate is increased to improve the heat transfer speed; when heat demand is lower, the water flow rate is reduced to save energy. The standardized connection design between water pump 11 and the inlet pipe interface 14 makes equipment installation and maintenance simpler and faster. Users can easily achieve normal operation and efficient heating without complex pipe connections and debugging. At the same time, the reliability of the water pump reduces the equipment failure rate and maintenance costs.

[0061] like Figure 1 As shown, a variable frequency fan 7 is provided near the evaporator 6, which promotes airflow through the evaporator 6 by adjusting the wind speed and air volume.

[0062] In this embodiment of the invention, the evaporator 6 is a crucial component for refrigerant evaporation and heat absorption, and its performance directly affects the cooling / heating efficiency of the equipment. To maximize the heat exchange efficiency of the evaporator, a variable frequency fan 7 is installed near the evaporator. The variable frequency fan 7 adjusts its rotation speed to change the airflow speed and volume. When the equipment is in heating mode, the variable frequency fan accelerates, generating stronger airflow to promote rapid airflow through the evaporator 6. This allows for more efficient absorption of heat from the air by the refrigerant within the evaporator, thereby improving heating efficiency. Conversely, in cooling mode, the variable frequency fan can also adjust its speed and volume as needed to achieve optimal cooling performance.

[0063] The speed regulation of the variable frequency fan is achieved through an intelligent electronic control device. Based on factors such as indoor temperature, user-set target temperature, and real-time heat exchange efficiency of the evaporator, the fan speed is automatically adjusted to ensure that the equipment always operates in the optimal state.

[0064] Variable frequency fans, by adjusting wind speed and airflow, ensure air flows through the evaporator at the optimal rate, fully utilizing the evaporator's heat exchange area and improving heat exchange efficiency. This helps the equipment reach the user-set temperature in a shorter time, enhancing the user experience. Variable frequency fans can automatically adjust their speed according to actual needs, avoiding the energy waste associated with traditional fixed-frequency fans. When heating or cooling demand is low, the fan speed can be reduced to decrease energy consumption; when demand is high, the speed is increased to meet the needs. This intelligent adjustment method makes the equipment more energy-efficient during operation. Through precise control of the intelligent electronic control system, variable frequency fans ensure stable operation under various conditions. This helps extend the equipment's lifespan and reduce maintenance costs due to equipment failure. Variable frequency fans can adjust the airflow according to actual needs, providing a more comfortable environment for users. In heating mode, a stronger airflow can accelerate the rise in indoor temperature; in cooling mode, a reduced airflow can avoid the discomfort caused by direct cold air. This personalized adjustment method allows the equipment to better meet user needs.

[0065] like Figure 1 As shown, the inlet pipe connector 14 is connected to the water supply pipe of the fan coil unit 15, and the outlet pipe connector 13 is connected to the water supply pipe of the underfloor heating system 16. Users can select and switch between using the fan coil unit or the underfloor heating system for heating as needed.

[0066] In this embodiment of the invention, after the equipment is powered on and the required water temperature for heating is set, the main control system first starts the water pump. Subsequently, the fan and compressor are started sequentially to bring the system into normal operation. During this process, the water or antifreeze in the system begins to circulate under the drive of the water pump. The heated water or antifreeze flows out from the air-source heat exchanger and enters the phase change energy storage device. The phase change energy storage device consists of an external insulation layer, an inner tank, a phase change material, and water heat exchange pipes. As the water or antifreeze flows in the water pipes, its heat is transferred to the phase change material through the pipe walls, causing the phase change material to complete a phase change process from solid to liquid, thereby storing heat.

[0067] Users can choose to use either fan coil units or underfloor heating for heating according to their actual needs. If fan coil unit heating is selected, heated water or antifreeze enters the fan coil unit through the inlet pipe connection 14 to provide warm air to the room. If underfloor heating is selected, heated water or antifreeze enters the underfloor heating system through the outlet pipe connection 13 to provide indoor heating through floor radiant heating. When the unit needs to defrost, the water pump sends indoor return water or antifreeze into the condenser for heat exchange. The refrigerant absorbs heat from the water or antifreeze for defrosting the finned evaporator. At this time, the water or antifreeze temperature decreases and enters the phase change energy storage unit. During the flow through the phase change energy storage unit, the low-temperature water or antifreeze absorbs the heat stored in the phase change material and enters the circulation. This heat is then carried back to the condenser through the indoor circulation pipe to participate in the defrosting process.

[0068] After defrosting is complete, the air source heat pump system switches to heating mode. The water or antifreeze is reheated and flows through the phase change energy storage device, where the heat is stored for use during the next defrost cycle. This process is repeated every time the system defrosts, providing a stable energy source for defrosting the equipment.

[0069] By integrating phase change energy storage (PCE) devices into air source heat pumps, the need for external buffer tanks is reduced, saving installation space. This is particularly important for buildings with limited installation space, and helps promote the application of air source heat pump systems in more scenarios. The heat stored in the PCE is the heat generated by the air source heat pump under high-efficiency operation (COP value around 2.6-4.5). Compared to external electric auxiliary heating devices (COP value less than 1), PCE saves a significant amount of electricity while providing the same amount of heat, resulting in significant energy savings. Users can flexibly switch between fan coil or underfloor heating modes according to actual needs to meet heating requirements in different scenarios. Simultaneously, because the PCE provides a stable defrosting energy source, it ensures stable operation of the air source heat pump system under harsh weather conditions, improving the overall user experience. Air source heat pump systems with built-in PCE reduce the number and complexity of external components, lowering system maintenance costs. Furthermore, the long lifespan and reliability of the PCE further extend the system's lifespan.

[0070] In practical applications, phase change energy storage devices consist of an external insulation layer, an inner liner, water circulation pipes, and phase change material. Phase change material can store and release a large amount of heat energy during solid-liquid transitions, with a molten heat value exceeding 200 J / g.

[0071] Taking a 60-liter buffer water tank as an example, when the unit defrosts, the water temperature drops from the underfloor heating outlet temperature of 35℃ to the lowest defrost temperature of 20℃, with a temperature difference Δt of 15℃. The released heat Q can be calculated using the formula: Q=c×m×Δt, where c is the specific heat capacity of water (maximum value 4.2*1000J / (KG℃)), and m is the mass of water in the tank (60KG).

[0072] This portion of heat is stored in the phase change material, and the required weight M of the phase change material can be calculated using the formula: In fact, phase change materials release both latent heat and sensible heat, so the mass required to actually release 3,780,000 J of heat is smaller.

[0073] After the equipment is powered on, the required water temperature is set. The intelligent electronic control device 9 first starts the water pump 11, and then sequentially starts the variable frequency fan 7 and the variable frequency compressor 1, allowing the equipment to operate normally. The water or antifreeze in the system circulates under the drive of the water pump, and is heated by the air source heat pump during the circulation process. The heated water or antifreeze flows out from the air source condenser heat exchanger and enters the phase change energy storage device 3. In the phase change energy storage device 3, the water or antifreeze flows in the water pipes, and heat is absorbed by the phase change material through the pipe walls, completing the solid-to-liquid phase change process, thereby storing heat.

[0074] When the unit needs defrosting, water pump 11 sends indoor return water or antifreeze into the condenser for heat exchange. The refrigerant absorbs heat from the water or antifreeze, which is used for defrosting the finned evaporator. After the water or antifreeze cools down, it enters the phase change energy storage unit (PCE), absorbing heat stored in the PCE material as it flows through the PCE 3. The water or antifreeze, having absorbed heat, enters the circulation system, and the heat is carried back to the condenser 2 through the indoor circulation pipes to participate in defrosting. After defrosting, the air source heat pump switches to heating mode, and the water or antifreeze is reheated and flows through the PCE 3 again, storing the heat for use during the next defrost cycle. This process of absorbing and releasing heat is repeated each time the unit defrosts, providing energy for defrosting. Compared to an external buffer water tank, this method reduces installation steps and equipment installation location requirements, solving the industry problem of bringing air source heat pumps upstairs.

[0075] Since the heat stored in the phase change energy storage device is the heat generated by air energy in a high-efficiency operating state (COP value around 2.6-4.5), there is no need to add an external electric auxiliary heating device to provide defrosting heat. The COP value of the external electric auxiliary heating device is less than 1. When providing the same amount of heat, the phase change energy storage method saves 2.6 to 4.5 times more electricity than the direct electric auxiliary heating method, resulting in significant energy-saving effects.

[0076] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. An air energy device with built-in phase change energy storage, characterized by, include: Variable frequency compressor (1) is used to compress refrigerant to produce gaseous refrigerant at high temperature and high pressure; The condenser (2) is connected to the variable frequency compressor (1) to condense the high-temperature and high-pressure gaseous refrigerant into liquid refrigerant and release heat; A phase change energy storage device (3) is connected to the condenser (2) to receive and store the heat released by the condenser (2); A liquid storage tank (4) is connected to the condenser (2) to store liquid refrigerant; The throttling device includes a first throttling device (5) and a second throttling device (8) for regulating the flow rate and pressure of the refrigerant, wherein one end of the second throttling device (8) is connected to the liquid storage tank (4); One end of the evaporator (6) is connected to one end of the first throttling device (5) to evaporate the liquid refrigerant into a gaseous refrigerant and absorb heat; The intelligent electronic control device (9) controls the variable frequency compressor (1) and the second throttling device (8).

2. The air energy unit with built-in phase change accumulator according to claim 1, characterized in that, The variable frequency compressor (1) is connected to the gas-liquid separator (12), and the gas-liquid separator (12) is connected to the other end of the evaporator (6).

3. The air energy device with built-in phase change thermal accumulator according to claim 2, characterized in that, The phase change energy storage device (3) is provided with a water outlet pipe connection (13) on its water circulation pipe.

4. The air energy unit with built-in phase change accumulator according to claim 3, characterized in that, One end of the first throttling device (5) is connected to the economizer (10), and the other end of the second throttling device (8) is connected to the economizer (10).

5. The air energy device with built-in phase change thermal accumulator according to claim 4, characterized in that, A water pump (11) is provided on the water circulation pipe to drive water or antifreeze to circulate in the water circulation pipe, and the water pump (11) is connected to the water inlet pipe connector (14); the water inlet pipe connector (14) is connected to the condenser (2).

6. The air energy device with built-in phase change thermal accumulator according to claim 5, characterized in that, A variable frequency fan (7) is provided near the evaporator (6) to promote airflow through the evaporator (6) by adjusting the wind speed and air volume.

7. The air energy device with built-in phase change thermal accumulator according to claim 6, characterized in that, The inlet pipe connector (14) is connected to the water supply pipe of the fan coil unit (15), and the outlet pipe connector (13) is connected to the water supply pipe of the underfloor heating system (16). Users can select and switch between using the fan coil unit or the underfloor heating system for heating as needed.

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