Water-ground source coupling heat pump system utilizing rural well and control method

Abstract

The invention relates to the field of heat pumps, and discloses a water ground source coupling heat pump system utilizing a rural well and a control method, the system comprises a well water extraction module, a variable frequency water pump control method is adopted, well water is extracted and purified from the rural well, and purified well water is generated; the soil source heat exchange module is used for realizing soil heat exchange by adopting a U-shaped buried pipe heat exchange method based on the purified well water and generating adjusted well water; and the fan coil module is used for refrigerating or supplying heat to air in the room by adopting a fan coil circulating system based on the adjusted well water to generate indoor cold / hot air. All-season efficient cooling and heating are achieved through combination of a rural well and a ground source U-shaped buried pipe and coupling heat exchange of a water source and a ground source, the low-temperature characteristic of well water is used for refrigeration preferentially, and the ground source system or the heat pump main machine is intelligently switched to conduct auxiliary heating / refrigeration according to environmental conditions.

Description

Technical Field

[0001] The invention relates to the technical field of heat pumps, in particular to a water-ground source coupled heat pump system utilizing a rural water well and a control method thereof. Background Art

[0002] Most traditional heat pump systems rely on only one of the air, soil or water sources for heat exchange.

[0003] The temperature of the air is most affected by the environment, so the air source heat pump has the lowest efficiency; the temperature of the soil is relatively stable compared to the air, but there are problems such as high energy consumption and low heat exchange efficiency caused by the mismatch of the dynamic load at the soil heat exchange end due to long-term use.

[0004] In recent years, single-well heating or air-conditioning systems that use abandoned oil drilling and geothermal wells for heat extraction have gradually emerged. However, most of them use large-scale casing-type drilling, which occupies a large area, has high investment, and is complex to control, and is not suitable for use in rural residential areas. Most importantly, due to the thermal stratification of water bodies in a single well, the above methods often mainly meet single heating or cooling needs, and cannot energy-efficiently and efficiently take into account both winter heating and summer air-conditioning needs.

[0005] In addition, rural areas have abundant well water resources, and the temperature of well water is relatively stable and low, especially in summer, the low temperature characteristics of well water make it an ideal cooling medium. However, rural wells are often single wells with small diameters, limited water capacity, and large water level fluctuations due to large domestic water use. Therefore, how to effectively utilize rural well water and combine it with heat pump technology to achieve reliable, energy-saving, and efficient cooling and heating throughout the year is an urgent problem to be solved. Summary of the invention

[0006] In view of the shortcomings of the prior art, the present invention provides a water-ground source coupled heat pump system and a control method utilizing rural water wells, which solves the problems of high energy consumption and low heat exchange efficiency caused by dynamic load mismatch at the soil heat exchange end due to long-term use.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a water-ground source coupled heat pump system using a rural water well, comprising: Well water extraction module, which uses variable frequency water pump control method to extract and purify well water from rural wells to generate purified well water; The soil source heat exchange module uses U-shaped buried pipe heat exchange method to achieve soil heat exchange based on purified well water to generate regulated well water; The fan coil module uses a fan coil circulation system to cool or heat the air in the room based on regulated well water to generate indoor cold / hot air; The heat pump host module uses a heat pump host auxiliary cooling / heating method based on regulated well water and indoor cold / hot air. When the well water or fan coil unit cannot independently achieve the target temperature, the heat pump host is enabled to perform auxiliary work to generate heat pump auxiliary cold / hot air; PLC control module, based on heat pump assisted cold / hot air, adopts PLC intelligent control method, real-time monitoring of temperature, flow, water level and other parameters in the system, automatically controls the operating status of each part of the equipment in the system, realizes efficient operation of the system by optimizing the control strategy, and generates system control signals; The domestic water module generates domestic water supply based on purified well water and system control signals.

[0008] Preferably, the well water extraction module includes a well water detection submodule, a water level judgment submodule, and a well water purification submodule; Well water detection submodule: adopts water level sensor detection algorithm, detects the water level status of well water through sensor, determines whether the well is ready for water extraction, determines whether well water can continue to be extracted based on the detection results, and generates the water level status of the well; Water level judgment submodule: Based on the water level status of the well, a logical judgment method is used to judge whether the water level of the well is sufficient for water supply. If the water level is normal, the well water is extracted in the next step. Result: The water level judgment result is generated; Well water purification submodule: Based on the water level judgment result, the filter purification method is adopted to preliminarily purify the well water through the filtration system to ensure that the water quality meets the use requirements of the subsequent heat pump system and generate purified well water.

[0009] Preferably, the soil source heat exchange module includes a temperature detection submodule, a heat exchange execution submodule, and a temperature regulation submodule; Temperature detection submodule: uses temperature sensor detection method to monitor the temperature of purified well water and soil in real time, obtains temperature information of well water and soil, and generates temperature monitoring results; Heat exchange execution submodule: Based on the temperature monitoring results, the U-shaped buried pipe heat exchange method is adopted. When the well water temperature is higher than the soil temperature, the buried U-shaped pipe is used to exchange heat with the soil to reduce the well water temperature to meet the demand and generate heat-exchanged well water; Temperature regulation submodule: Based on the well water that has undergone heat exchange, an automatic regulation control method is adopted to control the temperature and flow so that the well water temperature adapts to the use requirements of the subsequent system and generates regulated well water.

[0010] Preferably, the fan coil module includes a three-way valve switching submodule, an air circulation submodule, and a temperature control submodule; Three-way valve switching submodule: adopts the three-way solenoid valve control method to switch the regulated well water between cold and hot sources, and determines whether the well water enters the fan coil according to indoor demand to generate switched well water; Air circulation submodule: Based on the switched well water, the fan coil air circulation method is adopted to transfer the cold and heat of the well water to the indoor air through the fan coil to achieve the purpose of cooling or heating and generate cold / hot air; Temperature control submodule: Based on cold / hot air, it adopts temperature adjustment algorithm, monitors indoor temperature in real time, adjusts the wind speed and flow of fan coil to keep indoor temperature stable, and generates indoor cold / hot air.

[0011] Preferably, the heat pump host module includes a compressor operation submodule, a heat exchange submodule, and a temperature compensation submodule; Compressor operation submodule: Based on the regulated well water and indoor cold / hot air, the compressor is started when the well water temperature and indoor temperature cannot meet the demand, and the pressure is increased to exchange heat and generate high-pressure cold and hot fluids; Heat exchange submodule: Based on high-pressure cold and hot fluids, the condenser and evaporator heat exchange method is used to further adjust the well water temperature to assist the system in completing the cooling or heating task and generate cold and hot fluids after heat exchange; Temperature compensation submodule: Based on the cold and hot fluids that have undergone heat exchange, the temperature compensation method is used to adjust the fluid temperature according to the system requirements to ensure that the output air reaches the target temperature set indoors, generating heat pump-assisted cold / hot air.

[0012] Preferably, the PLC control module includes a sensor monitoring submodule, a control logic submodule, and an execution control submodule; Sensor monitoring submodule: adopts PLC sensor data acquisition algorithm to collect data from various sensors in the system, such as water level, temperature, and flow, to obtain the real-time operation status of the system, including the status data of purified well water, well water after heat exchange, indoor cold / hot air, etc., and generate system operation status data; Control logic submodule: Based on the system operation status data, the PLC logic control method is used to analyze the system operation requirements and generate control instructions to adjust the operation status of each component in the system, including valves, water pumps, heat pumps and other equipment; Execution control submodule: Based on the control instructions, the device execution method is used to control the three-way valve, variable frequency water pump, and heat pump host in the system accordingly to ensure that the entire system operates according to the expected control objectives and generate system control signals.

[0013] Preferably, the domestic water module includes a water pump control submodule, a domestic water regulation submodule, and a water status monitoring submodule; Water pump control submodule: adopts variable frequency water pump extraction method, based on purified well water and system control signal, controls the water pump to start, extracts the purified well water for domestic use, and generates extracted domestic water; Domestic water regulation submodule: Based on the extraction of domestic water, a water consumption regulation algorithm is used to control the flow rate and water supply time of domestic water, ensure the rational use of well water resources, do not affect the cooling / heating function of the system, and generate regulated domestic water; Water use status monitoring submodule: Based on the regulated domestic water use, the water pump status monitoring method is adopted to monitor the start and stop status of the domestic water pump to ensure the stability of water supply and not affect the operation of other functions of the system, thereby generating domestic water supply.

[0014] A water-ground source coupled heat pump control method using rural water wells. S1: First, the water level of the well water is detected by the water level sensor to determine the feasibility of well water extraction; then the filter system is used to purify the well water to ensure that the water quality entering the subsequent modules meets the standards; S2: Connect the purified well water in step S1 to the buried U-shaped pipe system. When the well water temperature is higher than the soil temperature, the soil heat exchange is used to adjust the temperature to a suitable level. The process uses a temperature sensor to monitor the well water temperature and soil temperature in real time and transmits them after the heat exchange is completed. S3: The well water regulated in step S2 is controlled to enter the cold and hot channels of the fan coil unit through the switching of the three-way solenoid valve, thereby providing the required cooling or heating for the room; S4: Based on the well water adjusted in step S2 and the cold / hot air in step S3, a heat pump host auxiliary cooling / heating method is used. When the well water or fan coil unit cannot independently achieve the target temperature, the heat pump host is enabled to perform auxiliary work. The temperature of the well water and air is adjusted through the compressor, condenser and evaporator to ensure that the demand for cooling or heating is met; S5: Based on the heat pump assisted cold / hot air obtained in step S4, a PLC intelligent control method is used to monitor the temperature, flow, water level and other parameters in the system in real time, and automatically control the operating status of each part of the equipment in the system, including the three-way valve, variable frequency water pump, heat pump host, etc., to achieve efficient operation of the system by optimizing the control strategy; S6: Based on the purified well water in step S1 and the system control signal in step S5, a domestic water extraction method is adopted to extract the purified well water through a domestic water pump for use as domestic water. At the same time, the start and stop control of the domestic water pump is implemented according to the control signal of the PLC to ensure that the system does not affect the cooling / heating function of the well water while providing domestic water.

[0015] The present invention provides a water-ground source coupled heat pump system and a control method using a rural water well. It has the following beneficial effects: 1. The present invention combines rural water wells and ground source U-shaped buried pipes to achieve efficient cooling and heating in all seasons through coupled heat exchange between water source and ground source. The low temperature characteristics of well water are used for cooling first, and intelligently switches to the ground source system or heat pump host for auxiliary heating / cooling according to environmental conditions.

[0016] 2. The present invention adopts a PLC controller to make intelligent decisions based on multiple sensor signals such as well water temperature, soil temperature, indoor temperature, etc., and automatically adjust the operating status of each part of the equipment; in different seasons, the intelligent control system can give priority to the most energy-saving heat exchange method, such as directly using well water for cooling or heating, and well water-assisted heat pump operation, to ensure the efficient operation of the system under various working conditions; 3. The present invention adopts a seasonal priority control strategy, which prioritizes the direct use of low-temperature well water for cooling in summer, and prioritizes the use of the high temperature characteristics of well water for heating in winter, thereby minimizing the operating time of the heat pump host. By giving priority to the use of well water temperature, the system achieves the maximum energy-saving effect, improves the overall efficiency of the heat pump system, and reduces dependence on energy.

[0017] 4. The present invention makes full use of the relatively stable low-temperature water resources such as rural well water as a renewable energy source for cold and warm exchange, reducing the dependence of traditional air conditioners and heat pumps on air sources and avoiding the problem of efficiency reduction caused by ambient temperature fluctuations. The system utilizes the abundant well water resources in rural areas, effectively reduces the consumption of external energy, and realizes sustainable development in rural scenes, achieving the goal of energy conservation and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a system framework diagram of the present invention; Figure 2 It is a schematic diagram of the well water extraction module of the present invention; Figure 3 This is a schematic diagram of a soil source heat exchange module of the present invention; Figure 4 It is a schematic diagram of a fan coil module of the present invention; Figure 5 This is a schematic diagram of a heat pump host module of the present invention; Figure 6 It is a schematic diagram of a PLC control module of the present invention; Figure 7 This is a schematic diagram of a domestic water module of the present invention; Figure 8 It is a method framework diagram of the present invention; Fig. 9 This is a summer refrigeration operating diagram of the present invention; Fig.10This is the winter heating operating diagram of the present invention; Fig.11 This is a working principle diagram of the present invention in which well water is preferentially used for cooling in summer; Fig.12 This is a working principle diagram of the present invention for preferentially utilizing well water for cooling in summer; Fig.13 This is a working principle diagram of the worst cooling condition in summer of the present invention; Fig.14 This is a working principle diagram of the present invention in which well water is used as the top priority for refrigeration in winter; Fig.15 This is a working principle diagram of the present invention for preferentially utilizing well water for refrigeration in winter; Fig.16 This is a working principle diagram of the worst refrigeration condition in winter of the present invention.

[0019] Among them, 11, well water extraction module; 101, well water detection submodule; 102, water level judgment submodule; 103, well water purification submodule; 12, soil source heat exchange module; 201, temperature detection submodule; 202, heat exchange execution submodule; 203, temperature regulation submodule; 13, fan coil module; 301, three-way valve switching submodule; 302, air circulation submodule; 303, temperature control submodule; 14, heat pump host module; 401, compressor operation submodule; 402, heat exchange submodule; 403, temperature compensation submodule; 15, PLC control module; 501, sensor monitoring submodule; 502, control logic submodule; 503, execution control submodule; 16, domestic water module; 601, water pump control submodule; 602, domestic water regulation submodule; 603, water use status monitoring submodule. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0021] Please see attached Figure 1 - Attachment Figure 8 The embodiment of the present invention provides a water-ground source coupled heat pump system using a rural water well, comprising: Well water extraction module, which uses variable frequency water pump control method to extract and purify well water from rural wells to generate purified well water; The soil source heat exchange module uses U-shaped buried pipe heat exchange method to achieve soil heat exchange based on purified well water to generate regulated well water; The fan coil module uses a fan coil circulation system to cool or heat the air in the room based on regulated well water to generate indoor cold / hot air; The heat pump host module uses a heat pump host auxiliary cooling / heating method based on regulated well water and indoor cold / hot air. When the well water or fan coil unit cannot independently achieve the target temperature, the heat pump host is enabled to perform auxiliary work to generate heat pump auxiliary cold / hot air; PLC control module, based on heat pump assisted cold / hot air, adopts PLC intelligent control method, real-time monitoring of temperature, flow, water level and other parameters in the system, automatically controls the operating status of each part of the equipment in the system, realizes efficient operation of the system by optimizing the control strategy, and generates system control signals; The domestic water module generates domestic water supply based on purified well water and system control signals.

[0022] Further, the well water extraction module includes a well water detection submodule, a water level determination submodule, and a well water purification submodule; Well water detection submodule: adopts water level sensor detection algorithm, detects the water level status of well water through sensor, determines whether the well is ready for water extraction, determines whether well water can continue to be extracted based on the detection results, and generates the water level status of the well; Water level judgment submodule: Based on the water level status of the well, a logical judgment method is used to judge whether the water level of the well is sufficient for water supply. If the water level is normal, the well water is extracted in the next step. Result: The water level judgment result is generated; Well water purification submodule: Based on the water level judgment result, the filter purification method is adopted to preliminarily purify the well water through the filtration system to ensure that the water quality meets the use requirements of the subsequent heat pump system and generate purified well water.

[0023] Furthermore, the soil source heat exchange module includes a temperature detection submodule, a heat exchange execution submodule, and a temperature regulation submodule; Temperature detection submodule: uses temperature sensor detection method to monitor the temperature of purified well water and soil in real time, obtains temperature information of well water and soil, and generates temperature monitoring results; Heat exchange execution submodule: Based on the temperature monitoring results, the U-shaped buried pipe heat exchange method is adopted. When the well water temperature is higher than the soil temperature, the buried U-shaped pipe is used to exchange heat with the soil to reduce the well water temperature to meet the demand and generate heat-exchanged well water; Temperature regulation submodule: Based on the well water that has undergone heat exchange, an automatic regulation control method is adopted to control the temperature and flow so that the well water temperature adapts to the use requirements of the subsequent system and generates regulated well water.

[0024] Furthermore, the fan coil module includes a three-way valve switching submodule, an air circulation submodule, and a temperature control submodule; Three-way valve switching submodule: adopts the three-way solenoid valve control method to switch the regulated well water between cold and hot sources, and determines whether the well water enters the fan coil according to indoor demand to generate switched well water; Air circulation submodule: Based on the switched well water, the fan coil air circulation method is adopted to transfer the cold and heat of the well water to the indoor air through the fan coil to achieve the purpose of cooling or heating and generate cold / hot air; Temperature control submodule: Based on cold / hot air, it adopts temperature adjustment algorithm, monitors indoor temperature in real time, adjusts the wind speed and flow of fan coil to keep indoor temperature stable, and generates indoor cold / hot air.

[0025] Furthermore, the heat pump host module includes a compressor operation submodule, a heat exchange submodule, and a temperature compensation submodule; Compressor operation submodule: Based on the regulated well water and indoor cold / hot air, the compressor is started when the well water temperature and indoor temperature cannot meet the demand, and the pressure is increased to exchange heat and generate high-pressure cold and hot fluids; Heat exchange submodule: Based on high-pressure cold and hot fluids, the condenser and evaporator heat exchange method is used to further adjust the well water temperature to assist the system in completing the cooling or heating task and generate cold and hot fluids after heat exchange; Temperature compensation submodule: Based on the cold and hot fluids that have undergone heat exchange, the temperature compensation method is used to adjust the fluid temperature according to the system requirements to ensure that the output air reaches the target temperature set indoors, generating heat pump-assisted cold / hot air.

[0026] Further, the PLC control module includes a sensor monitoring submodule, a control logic submodule, and an execution control submodule; Sensor monitoring submodule: adopts PLC sensor data acquisition algorithm to collect data from various sensors in the system, such as water level, temperature, and flow, to obtain the real-time operation status of the system, including the status data of purified well water, well water after heat exchange, indoor cold / hot air, etc., and generate system operation status data; Control logic submodule: Based on the system operation status data, the PLC logic control method is used to analyze the system operation requirements and generate control instructions to adjust the operation status of each component in the system, including valves, water pumps, heat pumps and other equipment; Execution control submodule: Based on the control instructions, the device execution method is used to control the three-way valve, variable frequency water pump, and heat pump host in the system accordingly to ensure that the entire system operates according to the expected control objectives and generate system control signals.

[0027] Furthermore, the domestic water module includes a water pump control submodule, a domestic water regulation submodule, and a water status monitoring submodule; Water pump control submodule: adopts variable frequency water pump extraction method, based on purified well water and system control signal, controls the water pump to start, extracts the purified well water for domestic use, and generates extracted domestic water; Domestic water regulation submodule: Based on the extraction of domestic water, a water consumption regulation algorithm is used to control the flow rate and water supply time of domestic water, ensure the rational use of well water resources, do not affect the cooling / heating function of the system, and generate regulated domestic water; Water use status monitoring submodule: Based on the regulated domestic water use, the water pump status monitoring method is adopted to monitor the start and stop status of the domestic water pump to ensure the stability of water supply and not affect the operation of other functions of the system, thereby generating domestic water supply.

[0028] For further information, please see the attached Fig. 9 - Attachment Fig.16 , Water-ground source coupled heat pump control method using rural water wells, S1: First, the water level of the well water is detected by the water level sensor to determine the feasibility of well water extraction; then the filter system is used to purify the well water to ensure that the water quality entering the subsequent modules meets the standards; S2: Connect the purified well water in step S1 to the buried U-shaped pipe system. When the well water temperature is higher than the soil temperature, the soil heat exchange is used to adjust the temperature to a suitable level. The process uses a temperature sensor to monitor the well water temperature and soil temperature in real time and transmits them after the heat exchange is completed. S3: The well water regulated in step S2 is controlled to enter the cold and hot channels of the fan coil unit through the switching of the three-way solenoid valve, thereby providing the required cooling or heating for the room; S4: Based on the well water adjusted in step S2 and the cold / hot air in step S3, a heat pump host auxiliary cooling / heating method is used. When the well water or fan coil unit cannot independently achieve the target temperature, the heat pump host is enabled to perform auxiliary work. The temperature of the well water and air is adjusted through the compressor, condenser and evaporator to ensure that the demand for cooling or heating is met; S5: Based on the heat pump assisted cold / hot air obtained in step S4, a PLC intelligent control method is used to monitor the temperature, flow, water level and other parameters in the system in real time, and automatically control the operating status of each part of the equipment in the system, including the three-way valve, variable frequency water pump, heat pump host, etc., to achieve efficient operation of the system by optimizing the control strategy; S6: Based on the purified well water in step S1 and the system control signal in step S5, a domestic water extraction method is adopted to extract the purified well water through a domestic water pump for use as domestic water, and at the same time, the start and stop control of the domestic water pump is implemented according to the control signal of the PLC, so as to ensure that the system does not affect the cooling / heating function of the well water while providing domestic water; Among them, when the "indoor temperature sensor" located in the "building room" is higher than the summer temperature set by the user, or lower than the winter temperature set by the user, the "fan coil unit" is started; Highest priority status: In summer, well water is used for cooling first: In summer, when the "well water temperature sensor" detects that the well water temperature is low, the PLC controller first controls the outlet medium end of the three-way solenoid valve 5 and the three-way solenoid valve 6 connected to the well water pipe to open, so that the well water can enter the pipe network (at this time, the outlet medium end of the three-way solenoid valve 5 and the three-way solenoid valve 6 connected to the "U-shaped buried pipe outlet pipe" and the "U-shaped buried pipe inlet pipe" is in a closed state); then the three-way solenoid valve 1-4 bypass pipeline allows the well water to bypass the "heat pump host" and enter the "bypass pipeline 1" and "bypass pipeline 2"; then control the start of the "variable frequency water pump 2" to directly send the well water to the fan coil for cooling. In this state, the "heat pump host" and the "variable frequency water pump 1" are not started; in winter, well water is used for heating first: In winter, the PLC controller first controls the collection of the signal of the "well water level sensor" to determine whether the well is short of water. If there is a water shortage, it will switch to the "soil source heat exchange" mode. If there is no water shortage, it will start the "variable frequency water pump 1". The rest of the control cooling is the same as the "preferential use of well water cooling in summer" instruction; Second priority status: Summer well water auxiliary cooling: When the "well water temperature sensor" detects that the well water temperature is high but still lower than the soil temperature, the PLC controller controls the three-way solenoid valve 1-4 to close the bypass pipeline, allowing the well water to pass through the "heat pump host"; then, the control system starts the "heat pump host", and the well water passes through the heat pump host for auxiliary cooling and is then sent to the fan coil. The other control processes are the same as the "highest priority state - giving priority to well water cooling in summer"; Winter well water assisted heating: In winter, the PLC controller first controls and collects the signal of the "well water level sensor" to determine whether the well is short of water. If it is short of water, it will switch to the "soil source heat exchange" mode. If it is not short of water, it will start the "variable frequency water pump 1". The rest of the control cooling is the same as the "summer well water assisted cooling" command; The lowest status: Soil source heat exchange: When the well water temperature is higher than the soil temperature in summer or lower than the soil temperature in winter, the PLC controller controls the outlet medium end of the three-way solenoid valve 5 and 6 connected to the well water pipe to be in a closed state, and the outlet medium end of the corresponding three-way solenoid valve 5 and 6 connected to the "U-shaped buried pipe outlet pipe" and "U-shaped buried pipe inlet pipe" is in an open state. Then control the start of "variable frequency water pump 1" to make the water flow on the right side of the "heat pump host" pass through the soil source U-shaped buried pipe system, so that the heat pump host extracts cold or heat from the soil for cooling or heating; Domestic water: Domestic water is drawn from the "well" through a "domestic water pump", and the button in the system PLC controller controls the start and stop of the "domestic water pump".

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A water-ground source coupled heat pump system using a rural well, characterized in that: include: Well water extraction module, which uses variable frequency water pump control method to extract and purify well water from rural wells to generate purified well water; The soil source heat exchange module uses U-shaped buried pipe heat exchange method to achieve soil heat exchange based on purified well water to generate regulated well water; The fan coil module uses a fan coil circulation system to cool or heat the air in the room based on regulated well water to generate indoor cold / hot air; The heat pump host module uses a heat pump host auxiliary cooling / heating method based on regulated well water and indoor cold / hot air. When the well water or fan coil unit cannot independently achieve the target temperature, the heat pump host is enabled to perform auxiliary work to generate heat pump auxiliary cold / hot air; PLC control module, based on heat pump assisted cold / hot air, adopts PLC intelligent control method, real-time monitoring of temperature, flow, water level and other parameters in the system, automatically controls the operating status of each part of the equipment in the system, realizes efficient operation of the system by optimizing the control strategy, and generates system control signals; The domestic water module generates domestic water supply based on purified well water and system control signals.

2. The water-ground source coupled heat pump system using a rural water well according to claim 1 is characterized in that: The well water extraction module includes a well water detection submodule, a water level judgment submodule, and a well water purification submodule; Well water detection submodule: adopts water level sensor detection algorithm, detects the water level status of well water through sensor, determines whether the well is ready for water extraction, determines whether well water can continue to be extracted based on the detection results, and generates the water level status of the well; Water level judgment submodule: Based on the water level status of the well, a logical judgment method is used to judge whether the water level of the well is sufficient for water supply. If the water level is normal, the well water is extracted in the next step. Result: The water level judgment result is generated; Well water purification submodule: Based on the water level judgment result, the filter purification method is adopted to preliminarily purify the well water through the filtration system to ensure that the water quality meets the use requirements of the subsequent heat pump system and generate purified well water.

3. The water-ground source coupled heat pump system using a rural water well according to claim 1, characterized in that: The soil source heat exchange module includes a temperature detection submodule, a heat exchange execution submodule, and a temperature adjustment submodule; Temperature detection submodule: uses temperature sensor detection method to monitor the temperature of purified well water and soil in real time, obtains temperature information of well water and soil, and generates temperature monitoring results; Heat exchange execution submodule: Based on the temperature monitoring results, the U-shaped buried pipe heat exchange method is adopted. When the well water temperature is higher than the soil temperature, the buried U-shaped pipe is used to exchange heat with the soil to reduce the well water temperature to meet the demand and generate heat-exchanged well water; Temperature regulation submodule: Based on the well water that has undergone heat exchange, an automatic regulation control method is adopted to control the temperature and flow so that the well water temperature adapts to the use requirements of the subsequent system and generates regulated well water.

4. The water-ground source coupled heat pump system using a rural water well according to claim 1, characterized in that: The fan coil module includes a three-way valve switching submodule, an air circulation submodule, and a temperature control submodule; Three-way valve switching submodule: adopts the three-way solenoid valve control method to switch the regulated well water between cold and hot sources, and determines whether the well water enters the fan coil according to indoor demand to generate switched well water; Air circulation submodule: Based on the switched well water, the fan coil air circulation method is adopted to transfer the cold and heat of the well water to the indoor air through the fan coil to achieve the purpose of cooling or heating and generate cold / hot air; Temperature control submodule: Based on cold / hot air, it adopts temperature adjustment algorithm, monitors indoor temperature in real time, adjusts the wind speed and flow of fan coil to keep indoor temperature stable, and generates indoor cold / hot air.

5. The water-ground source coupled heat pump system using a rural water well according to claim 1, characterized in that: The heat pump host module includes a compressor operation submodule, a heat exchange submodule, and a temperature compensation submodule; Compressor operation submodule: Using the compressor driving algorithm, based on the regulated well water and indoor cold / hot air, the compressor is started when the well water temperature and indoor temperature cannot meet the demand, and heat exchange is performed by increasing the pressure to generate high-pressure cold and hot fluids; Heat exchange submodule: Based on high-pressure cold and hot fluids, the condenser and evaporator heat exchange method is used to further adjust the well water temperature to assist the system in completing cooling or heating tasks and generate cold and hot fluids after heat exchange; Temperature compensation submodule: Based on the cold and hot fluids that have undergone heat exchange, the temperature compensation method is used to adjust the fluid temperature according to the system requirements to ensure that the output air reaches the target temperature set indoors, generating heat pump-assisted cold / hot air.

6. The water-ground source coupled heat pump system using a rural water well according to claim 1, characterized in that: The PLC control module includes a sensor monitoring submodule, a control logic submodule, and an execution control submodule; Sensor monitoring submodule: adopts PLC sensor data acquisition algorithm to collect data from various sensors in the system, such as water level, temperature, and flow, to obtain the real-time operation status of the system, including the status data of purified well water, well water after heat exchange, indoor cold / hot air, etc., and generate system operation status data; Control logic submodule: Based on the system operation status data, the PLC logic control method is used to analyze the system operation requirements and generate control instructions to adjust the operation status of each component in the system, including valves, water pumps, heat pumps and other equipment; Execution control submodule: Based on the control instructions, the device execution method is used to control the three-way valve, variable frequency water pump, and heat pump host in the system accordingly to ensure that the entire system operates according to the expected control objectives and generate system control signals.

7. The water-ground source coupled heat pump system using a rural water well according to claim 1, characterized in that: The domestic water module includes a water pump control submodule, a domestic water regulation submodule, and a water status monitoring submodule; Water pump control submodule: adopts variable frequency water pump extraction method, based on purified well water and system control signal, controls the water pump to start, extracts the purified well water for domestic use, and generates extracted domestic water; Domestic water regulation submodule: Based on the extraction of domestic water, a water consumption regulation algorithm is used to control the flow rate and water supply time of domestic water, ensure the rational use of well water resources, do not affect the cooling / heating function of the system, and generate regulated domestic water; Water use status monitoring submodule: Based on the regulated domestic water use, the water pump status monitoring method is adopted to monitor the start and stop status of the domestic water pump to ensure the stability of water supply and not affect the operation of other functions of the system, thereby generating domestic water supply.

8. A water-ground source coupled heat pump control method using a rural water well, characterized in that: S1: First, the water level of the well water is detected by the water level sensor to determine the feasibility of well water extraction; then the filter system is used to purify the well water to ensure that the water quality entering the subsequent modules meets the standards; S2: Connect the purified well water in step S1 to the buried U-shaped pipe system. When the well water temperature is higher than the soil temperature, the soil heat exchange is used to adjust the temperature to a suitable level. The process uses a temperature sensor to monitor the well water temperature and soil temperature in real time and transmits them after the heat exchange is completed. S3: The well water regulated in step S2 is controlled to enter the cold and hot channels of the fan coil unit through the switching of the three-way solenoid valve, thereby providing the required cooling or heating for the room; S4: Based on the well water adjusted in step S2 and the cold / hot air in step S3, a heat pump host auxiliary cooling / heating method is used. When the well water or fan coil unit cannot independently achieve the target temperature, the heat pump host is enabled to perform auxiliary work. The temperature of the well water and air is adjusted through the compressor, condenser and evaporator to ensure that the demand for cooling or heating is met; S5: Based on the heat pump assisted cold / hot air obtained in step S4, a PLC intelligent control method is used to monitor the temperature, flow, water level and other parameters in the system in real time, and automatically control the operating status of each part of the equipment in the system, including the three-way valve, variable frequency water pump, heat pump host, etc., to achieve efficient operation of the system by optimizing the control strategy; S6: Based on the purified well water in step S1 and the system control signal in step S5, a domestic water extraction method is adopted to extract the purified well water through a domestic water pump for use as domestic water. At the same time, the start and stop control of the domestic water pump is implemented according to the control signal of the PLC to ensure that the system does not affect the cooling / heating function of the well water while providing domestic water.

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