Heating and refrigerating system and control method thereof

Abstract

The invention discloses a heating and refrigerating system and a control method thereof. The heating and refrigerating system comprises a control system, a geothermal system, an outdoor heat exchanger and a cold and heat supply system. The geothermal system is used for heat production in a heating mode and heat storage in a refrigeration mode and transmitting first physical quantity data in the operation process to the control system. The cold and heat supply system is used for conducting heat exchange with the geothermal system through the outdoor heat exchanger and transmitting second physical quantity data in the operation process and the target demand temperature of the user side to the control system. The control system is used for judging an operation mode according to the current temperature of the user side and the target demand temperature; the control system is further used for outputting control signals to the geothermal system and the cold and heat supply system according to the first physical quantity data, the second physical quantity data and the target required temperature. The energy consumption efficiency of the heating and refrigerating system can be improved, and the problem of waste of heat energy and electric energy caused by mismatching of supply and demand can be avoided.

Description

Technical Field

[0001] This invention relates to the field of energy supply system technology, and in particular to a heating and cooling system and its control method. Background Technology

[0002] With the world placing great emphasis on energy conservation, emission reduction, and sustainable development, various energy industries are actively transforming their energy structures, gradually reducing the proportion of traditional fossil fuels and replacing them with clean, efficient, and intelligent integrated energy systems.

[0003] In existing technologies, wind and solar power curtailment is typically used to power heating equipment and pumps. The heating equipment heats high-pressure CO2 from the pumps to a high-temperature, high-pressure state, then pumps the CO2 to underground injection wells for storage in enhanced geothermal fields. When electricity demand exceeds demand, the high-temperature, high-pressure CO2 from the geothermal field is released into expansion equipment for power generation. Alternatively, technologies such as artificial intelligence and the Internet of Things can be used to comprehensively manage and intelligently interpret big data generated during geothermal development, thereby establishing a mechanism-data fusion model of the geothermal field, generating intelligent optimization decisions, and implementing intelligent regulation. Another approach is to set up an intelligent geothermal operation and maintenance system comprising detection devices, monitoring devices, control devices, and a database. The detection and monitoring devices collect geothermal system information, the control device processes this information in conjunction with the database, and feeds it back to the geothermal system for fault repair.

[0004] However, there is still room for improvement in the efficiency of electrical and geothermal energy utilization in existing technologies. Moreover, most of them use existing production data to build models, which cannot respond in real time to the supply and demand relationship on the heat source and the user side. The sensitivity to the user side's heating and cooling needs is insufficient, resulting in low energy efficiency of the system. Summary of the Invention

[0005] This invention provides a heating and cooling system and its control method to improve the energy efficiency of the heating and cooling system and avoid the waste of heat and electricity caused by supply and demand mismatch.

[0006] According to one aspect of the present invention, a heating and cooling system is provided, comprising: Control system; The geothermal system is connected to the first circulation pipeline and electrically connected to the control system. The geothermal system is used for heat production in heating mode and heat storage in cooling mode, and transmits the first physical quantity data during operation to the control system. The outdoor heat exchanger is connected to the first circulation pipeline and the second circulation pipeline respectively; A heating and cooling supply system is connected to the second circulation pipeline and electrically connected to the control system. The heating and cooling supply system is used to exchange heat with the geothermal system through the outdoor heat exchanger and to transmit second physical quantity data during operation and the target demand temperature on the user side to the control system. The control system is used to determine the operating mode based on the current temperature on the user side and the target demand temperature, and to compress and expand the working fluid in the second circulation pipeline according to the operating mode. The operating modes include heating mode and cooling mode. The control system is also used to output control signals to the geothermal system and the heating and cooling supply system based on the first physical quantity data, the second physical quantity data and the target required temperature.

[0007] Optionally, the geothermal system includes: The first energy supply unit is used for heat production in heating mode and heat storage in cooling mode. The second energy supply unit is used for heat production in the heating mode; Multiple first detection units are electrically connected to the control system. The first detection units are used to detect the first physical quantity data during the operation of the geothermal system and transmit it to the control system. The first detection unit includes at least one of a first temperature sensor, a first pressure sensor, and a first flow sensor. Water storage unit; The water distribution valve is electrically connected to the control system. The control system is also used to switch the operating mode by controlling the direction and opening degree of the water distribution valve in order to balance the water pressure of the water storage unit.

[0008] The heating and cooling supply system includes: Multiple second detection units are electrically connected to the control system. The second detection units are used to detect the second physical quantity data during the operation of the hot and cold supply system. The second detection unit includes at least one of a second temperature sensor, a second pressure sensor, and a second flow sensor. The compressor is electrically connected to the control system, which controls the compressor to compress the working fluid according to the operating mode in order to increase the temperature of the working fluid. A signal receiving unit is electrically connected to the control system. The signal receiving unit is used to acquire the target required temperature set by the user and transmit it to the control system. Indoor heat exchangers are used to regulate the current temperature on the user side. An expansion valve is electrically connected to the control system, which controls the expansion valve to expand the working fluid according to the operating mode, so as to regulate the flow rate of the working fluid. A reversing valve is electrically connected to the control system, which controls the operation of the reversing valve according to the operating mode to switch the flow direction of the working fluid.

[0009] Optionally, in heating mode, the circulating water in the first circulation pipeline extracts heat from the ground through the first energy supply unit to form circulating water with a first temperature, and exchanges heat with the second energy supply unit to form circulating water with a second temperature; the circulating water with the second temperature exchanges heat with the heating and cooling supply system through the outdoor heat exchanger to form circulating water with a third temperature, and is then transported to the first energy supply unit through the first circulation pipeline; wherein, the third temperature is lower than the first temperature, and the first temperature is lower than the second temperature; The working fluid in the second circulation pipeline extracts heat from the geothermal system through the outdoor heat exchanger and is compressed by the compressor to form the working fluid with a fourth temperature. The working fluid with the fourth temperature exchanges heat through the indoor heat exchanger to form the working fluid with a fifth temperature. After being expanded by the expansion valve, it is transported to the outdoor heat exchanger through the second circulation pipeline; wherein the fifth temperature is lower than the fourth temperature.

[0010] Optionally, in cooling mode, the circulating water in the first circulation pipeline extracts heat from the heating and cooling supply system through the outdoor heat exchanger to form circulating water with a sixth temperature, and the circulating water with the sixth temperature is transferred to the first energy supply unit. The first energy supply unit stores the heat carried by the circulating water in the ground to form circulating water with a seventh temperature, and the circulating water with the seventh temperature circulates and exchanges heat through the outdoor heat exchanger; wherein, the seventh temperature is lower than the sixth temperature. The working fluid in the second circulation pipeline exchanges heat through the outdoor heat exchanger to form the working fluid with an eighth temperature. The working fluid with the eighth temperature enters the indoor heat exchanger through the expansion valve to exchange heat to form the working fluid with a ninth temperature. After the compressor increases the pressure and temperature, the working fluid is transported to the outdoor heat exchanger through the second circulation pipeline. The ninth temperature is greater than the eighth temperature.

[0011] Optionally, the first energy supply unit includes a shallow buried pipe, a shallow geothermal water supply pump, and a shallow geothermal return water pump; the second energy supply unit includes a medium-deep geothermal production well, a medium-deep geothermal reinjection well, a plate heat exchanger, a cyclone desander, a medium-deep water supply pump, and a medium-deep return water pump; the water storage unit includes a first water storage tank and a second water storage tank. The shallow underground pipe is connected between the first side of the shallow geothermal water supply pump and the first side of the shallow geothermal return water pump. The second side of the shallow geothermal water supply pump is connected to the first side of the plate heat exchanger. The second side of the plate heat exchanger is connected to the first side of the first water storage tank. The second side of the first water storage tank is connected to the first end of the water distribution valve. The second end of the water distribution valve is connected to the second side of the outdoor heat exchanger. The first side of the outdoor heat exchanger is connected to the second side of the shallow geothermal return water pump. The first side of the second water storage tank is connected to the second side of the shallow geothermal water supply pump. The second side of the second water storage tank is connected to the third end of the water distribution valve. The medium-deep geothermal production well is connected to the first side of the cyclone desander, the second side of the cyclone desander is connected to the first side of the medium-deep water supply pump, the second side of the medium-deep water supply pump is connected to the first side of the plate heat exchanger, the second side of the plate heat exchanger is connected to the first side of the medium-deep return water pump, and the second side of the medium-deep return water pump is connected to the medium-deep geothermal reinjection well.

[0012] Optionally, the first detection unit is disposed on the first side of the shallow buried pipe, and the first detection unit includes a first temperature sensor, a first pressure sensor and a first flow sensor; And / or, The first detection unit is disposed on the first side of the medium-deep water supply pump, and the first detection unit includes a first temperature sensor, a first pressure sensor and a first flow sensor; And / or, The first detection unit is respectively disposed on the surface of the first water tank and the surface of the second water tank, and the first detection unit includes a first temperature sensor; And / or, The first detection unit is located on the second side of the outdoor heat exchanger, and the first detection unit includes a first temperature sensor and a first pressure sensor.

[0013] Optionally, the second detection unit is disposed on both sides of the indoor heat exchanger, and the second detection unit includes a second temperature sensor; And / or, The second detection unit is located on the second side of the compressor, and the second detection unit includes a second temperature sensor, a second pressure sensor, and a second flow sensor.

[0014] Optionally, the reversing valve is a four-way reversing valve; The control system is also used to connect the first side of the compressor to the second side of the indoor heat exchanger and the second side of the compressor to the first side of the outdoor heat exchanger when the current temperature on the user side is greater than the target required temperature. It also controls the mid-depth water supply pump, the mid-depth water return pump and the plate heat exchanger to shut down, and controls the water distribution valve to connect the first water storage tank and the outdoor heat exchanger. When the current temperature on the user side is lower than the target required temperature, the four-way reversing valve connects the first side of the compressor to the first side of the outdoor heat exchanger and the second side of the compressor to the second side of the indoor heat exchanger, and controls the opening of the medium-deep water supply pump, the medium-deep water return pump and the plate heat exchanger, and controls the water distribution valve to connect the second water storage tank and the outdoor heat exchanger.

[0015] According to another aspect of the present invention, a control method for a heating and cooling system is provided, for controlling the heating and cooling system provided in any embodiment of the present invention, which is executed by the control system; The control method for the heating and cooling system includes: Acquire the first physical quantity data during the operation of the geothermal system; Acquire the second physical quantity data and the target demand temperature on the user side during the operation of the heating and cooling supply system; Based on the first physical quantity data, the second physical quantity data, and the target required temperature, control signals are output to the geothermal system and the heating and cooling supply system.

[0016] Optionally, based on the first physical quantity data, the second physical quantity data, and the target required temperature, control signals are output to the geothermal system and the heating / cooling supply system, including: Based on the first physical quantity data and the second physical quantity data, and taking the target demand temperature, system efficiency, and system energy consumption as optimization objectives, physical constraint technology is used to output control signals to the geothermal system and the heating and cooling supply system.

[0017] Optionally, the geothermal system includes a shallow geothermal water supply pump, a shallow geothermal return water pump, a medium-deep geothermal water supply pump, a medium-deep geothermal return water pump, a first water storage tank, a second water storage tank, and a water distribution valve; the heating and cooling supply system includes an expansion valve, a compressor, a reversing valve, an outdoor heat exchanger, and an indoor heat exchanger. The step of outputting control signals to the geothermal system and the heating and cooling supply system includes: Control signals are output to the shallow geothermal water supply pump, the shallow geothermal return pump, the medium-deep geothermal water supply pump, the medium-deep geothermal return pump, the first water storage tank, the second water storage tank, the water distribution valve, the expansion valve, the compressor, and the reversing valve to adjust the pump power of the shallow geothermal water supply pump, the shallow geothermal return pump, the medium-deep geothermal water supply pump, and the medium-deep geothermal return pump; adjust the mass flow rate of the second side of the first water storage tank and the second side of the second water storage tank; adjust the valve direction of the water distribution valve; adjust the opening of the expansion valve; adjust the power of the compressor; adjust the valve direction of the reversing valve; and adjust the temperature of the first / second side of the indoor heat exchanger.

[0018] Optionally, in heating mode, the first opening degree of the expansion valve The calculation formula is: In cooling mode, the second opening degree of the expansion valve The calculation formula is: in, The mass flow rate of the working fluid. The flow coefficient of the expansion valve is... The density of the refrigerant gas, The pressure on the first side of the expansion valve. This refers to the pressure on the second side of the expansion valve.

[0019] Optionally, the control system is also used to calculate the user-side flow rate of the indoor heat exchanger; The user-side flow rate of the indoor heat exchanger The calculation formula is: in, The specific heat capacity of indoor air. The temperature on the first side of the indoor heat exchanger. The temperature on the second side of the indoor heat exchanger. This is the current indoor temperature. Set the temperature for the user. For the working fluid mass flow rate, This is the specific heat capacity of the working fluid.

[0020] Optionally, the control system is also used to calculate the compressor power; The power of the compressor The calculation formula is: in, The enthalpy value of the first side of the compressor. The enthalpy value is the value on the second side of the compressor.

[0021] Optionally, the geothermal system includes a first energy supply unit, which includes a shallow buried pipe; The control system is also used to calculate the flow rate of the shallow buried pipes of the geothermal system. The flow rate of the shallow buried pipe of the geothermal system The calculation formula is: in, For the working fluid mass flow rate, The specific heat capacity of the working fluid, The temperature on the first side of the indoor heat exchanger. The temperature on the first side of the outdoor heat exchanger. The outlet temperature of the first water tank / second water tank. This refers to the inlet temperature of the shallow buried pipe. This is the specific heat capacity of water.

[0022] Optionally, the geothermal system includes a second energy supply unit, which includes a medium-deep geothermal production well; The control system is also used to calculate the flow rate of deep geothermal production wells in the geothermal system. Flow rate of deep geothermal production wells in the geothermal system The calculation formula is: in, This refers to the flow rate of the shallow geothermal water supply pump in the geothermal system. The outlet temperature of the first water tank / second water tank. Temperature at the inlet of shallow buried pipes. This refers to the temperature of deep geothermal production wells in a geothermal system. This refers to the outdoor temperature.

[0023] Optionally, the geothermal system includes multiple first detection units, and the heating and cooling supply system includes multiple second detection units; The control system calculates and adjusts the output value of the control system in real time based on the user-side flow rate of the indoor heat exchanger, the first opening degree of the expansion valve, the second opening degree of the expansion valve, the user-side flow rate of the indoor heat exchanger, the compressor power, the flow rate of the shallow buried pipe of the geothermal system, the flow rate of the deep geothermal production well in the geothermal system, and the feedback values ​​of multiple first detection units and multiple second detection units. The calculation method for the control system is as follows: in, For the control quantities of expansion valves, indoor heat exchangers, compressors, shallow geothermal water supply pumps, and medium-deep geothermal water supply pumps, This is the difference between the measured value and the set value. The measured value includes the expansion valve opening in heating / cooling mode. User-side flow rate of indoor heat exchanger Compressor power Shallow buried pipe flow Flow rate of medium-deep geothermal production wells The setpoints include the first opening degree of the expansion valve. The second opening degree of the expansion valve User-side flow rate of indoor heat exchanger Compressor power Shallow geothermal water supply pump flow rate Medium-deep water supply pump flow rate , The number of operations. , , These are the proportional adjustment coefficient, integral adjustment coefficient, and derivative adjustment coefficient, respectively.

[0024] Optionally, the control system is also used to calculate system efficiency and implement regulation; The system efficiency The calculation method is as follows: in, For the user-side flow rate of the indoor heat exchanger, The specific heat capacity of indoor air. Set the temperature for the user. This is the current indoor temperature. For compressor power, For shallow geothermal water supply pump flow rate, For shallow buried pipe pressure, For the outlet pressure of the first water storage tank / second water storage tank, For the flow rate of medium and deep water supply pumps, For the pressure of medium-deep geothermal reinjection wells, This refers to the pressure of medium-deep geothermal production wells.

[0025] The technical solution of this invention, through setting up a heating and cooling system including a control system, a geothermal system, an outdoor heat exchanger, and a heating and cooling supply system, allows the control system to acquire first physical quantity data during the operation of the geothermal system and second physical quantity data during the operation of the heating and cooling supply system in real time. It also acquires the current temperature and target required temperature on the user side through the heating and cooling supply system. Based on the first physical quantity data, the second physical quantity data, and the target required temperature, the control system controls the geothermal system and the heating and cooling supply system. Therefore, the control system can understand the heating and cooling status in real time, dynamically calculate the energy required on the user side, and flexibly adjust the temperature to achieve real-time response to the user's heating and cooling needs. This improves the sensitivity of the user's heating and cooling demand response, enhances the energy efficiency of the heating and cooling system, and avoids the problem of wasted heat and electricity due to supply-demand mismatch.

[0026] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a heating and cooling system provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of another heating and cooling system provided in an embodiment of the present invention; Figure 3 This is a schematic diagram showing the connection relationships between the functional units of a heating and cooling system in heating mode. Figure 4 This is a schematic diagram showing the connection relationships between the functional units of a heating and cooling system in cooling mode. Figure 5 A flowchart of a control method for a heating and cooling system provided in an embodiment of the present invention; Figure 6 A flowchart of another control method for a heating and cooling system provided in an embodiment of the present invention. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0030] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and their variations, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0031] This invention provides a heating and cooling system. Figure 1 This is a schematic diagram of a heating and cooling system provided in an embodiment of the present invention. See also: Figure 1 The heating and cooling system includes a control system 18, a geothermal system 20, an outdoor heat exchanger 13, and a heating and cooling supply system 40.

[0032] The geothermal system 20 is connected to the first circulation pipeline and electrically connected to the control system 18. The geothermal system 20 is used for heat production in heating mode and heat storage in cooling mode, and transmits the first physical quantity data during operation to the control system 18. The outdoor heat exchanger 13 is connected to both the first and second circulation pipelines. The heating and cooling supply system 40 is connected to the second circulation pipeline and electrically connected to the control system 18. The heating and cooling supply system 40 is used for heat exchange with the geothermal system 20 through the outdoor heat exchanger 13, and transmits the second physical quantity data during operation and the target temperature requirement on the user side to the control system 18. The control system 18 determines the operating mode based on the current temperature on the user side and the target temperature requirement, and controls the heating and cooling supply system 40 to compress and expand the working fluid in the second circulation pipeline according to the operating mode. The operating modes include heating mode and cooling mode. The control system 18 also outputs control signals to the geothermal system 20 and the heating and cooling supply system 40 based on the first physical quantity data, the second physical quantity data, and the target temperature requirement.

[0033] Specifically, the geothermal system 20 is used to extract and process geothermal energy in heating mode to obtain geothermal energy that meets preset requirements; and in cooling mode, it utilizes the temperature difference between the circulating water in the first circulation pipeline and the ground to release the heat carried by the circulating water into the ground, thereby reducing the temperature of the circulating water. The first physical quantity data is dynamic data of the geothermal system 20 during heat production and heat storage processes. For example, the first physical quantity data may include a first pressure value, a first temperature value, and a first flow rate value. The second physical quantity data is dynamic data of the heating and cooling supply system 40 during operation. For example, the second physical quantity data may include a second pressure value, a second temperature value, and a second flow rate value. The current temperature on the user side can be obtained from the second physical quantity data. It is understood that both the first and second physical quantity data can be obtained in real time. The geothermal system 20 is located at the heat source, and the heating and cooling supply system 40 is located on the user side. The control system 18 can be a MIMO (Multiple-Input Multiple-Output) system. The working fluid is an organic working fluid.

[0034] Specifically, the control system 18 determines the operating mode based on the current temperature on the user side and the target required temperature. For example, when the current temperature on the user side is lower than the target required temperature, the operating mode is heating mode; when the current temperature on the user side is higher than the target required temperature, the operating mode is cooling mode.

[0035] In heating mode, the geothermal system 20 extracts geothermal energy to raise the temperature of the circulating water in the first circulation pipeline, and the heated circulating water exchanges heat with the heating and cooling supply system 40 through the outdoor heat exchanger 13. The heating and cooling supply system 40 obtains heat from the geothermal system 20, and the control system 18 controls the heating and cooling supply system 40 to compress and expand the working fluid in the second circulation pipeline to regulate the temperature and flow rate of the working fluid. Subsequently, the working fluid enters the outdoor heat exchanger 13 and circulates again. At the same time, the geothermal system 20 and the heating and cooling supply system 40 transmit real-time dynamic data during the operation to the control system 18.

[0036] In cooling mode, the circulating water in the first circulation pipeline extracts heat from the heating and cooling supply system 40 via the outdoor heat exchanger 13. The geothermal system 20 stores the heat carried by the circulating water into the ground. The cooled circulating water circulates and exchanges heat through the outdoor heat exchanger 13. The heating and cooling supply system 40 obtains a cold source from the geothermal system 20. The working fluid in the second circulation pipeline is cooled by the outdoor heat exchanger 13. The system 100 controls the heating and cooling supply system 40 to compress the cooled working fluid to increase its pressure and temperature. Subsequently, the working fluid recirculates again after entering the outdoor heat exchanger 13, that is, it is cooled by the cold source of the geothermal system 30 through the outdoor heat exchanger 13 and continues to circulate. At the same time, the geothermal system 20 and the heating and cooling supply system 40 transmit real-time dynamic data during operation to the control system 18.

[0037] Furthermore, the control system 18 receives the first physical quantity data, the second physical quantity data, and the target required temperature in real time, and can control the status of the geothermal system 20 and the heating and cooling supply system 40 in real time. It can also dynamically calculate the required precise energy based on factors such as indoor and outdoor temperature difference and ground temperature changes, and supply it on demand, thus avoiding the problems of temperature fluctuation and energy waste caused by traditional control methods.

[0038] The technical solution of this invention, by setting up a heating and cooling system including a control system 18, a geothermal system 20, an outdoor heat exchanger 13, and a heating and cooling supply system 40, allows the control system 18 to acquire first physical quantity data during the operation of the geothermal system 20 and second physical quantity data during the operation of the heating and cooling supply system 40 in real time. It also acquires the current temperature and target required temperature on the user side through the heating and cooling supply system 40, and controls the geothermal system 20 and the heating and cooling supply system 40 based on the first physical quantity data, the second physical quantity data, and the target required temperature. Therefore, the control system 18 can understand the heating and cooling status in real time, dynamically calculate the energy required on the user side, and flexibly adjust the temperature to achieve real-time response to the user's heating and cooling needs. This improves the sensitivity of the user's heating and cooling demand response, enhances the energy efficiency of the heating and cooling system, and avoids the problem of wasted heat and electricity due to supply and demand mismatch.

[0039] Figure 2 This is a schematic diagram of another heating and cooling system provided in an embodiment of the present invention. See also... Figure 2 Based on the above embodiments, optionally, the geothermal system 20 includes: a first energy supply unit 21, a second energy supply unit 22, a plurality of first detection units 23, a water distribution valve 11, and a water storage unit 25.

[0040] The first energy supply unit 21 is used for heat production in heating mode and heat storage in cooling mode. The second energy supply unit 22 is used for heat production in heating mode. Multiple first detection units 23 are electrically connected to the control system 18. The first detection units 23 are used to detect first physical quantity data during the operation of the geothermal system 20 and transmit it to the control system 18. The first detection unit 23 includes at least one of a first temperature sensor, a first pressure sensor, and a first flow sensor. The water distribution valve 11 is electrically connected to the control system 18. The control system 18 is also used to switch the operating mode by controlling the direction and opening degree of the water distribution valve 11 to balance the water pressure of the water storage unit 25.

[0041] It is understandable that the physical quantity data to be detected will be different when the first detection unit 23 is set in different positions. Therefore, the types of sensors included in the first detection unit 23 at different positions will also be different.

[0042] Among them, the water distribution valve 11 can be a three-way water distribution valve.

[0043] Specifically, the geothermal system 20 uses a three-way water distribution valve to switch between heating and cooling modes. The first detection unit 23 detects the temperature of the water storage unit 25 in real time and transmits the temperature to the control system 18. The control system 18 intelligently controls the valve direction and opening of the water distribution valve 11 by reading the temperature of the water storage unit 25 and the required temperature (target demand temperature) of the heating and cooling supply system 40.

[0044] In summary, the geothermal system 20 can automatically switch between heating and cooling modes according to user needs through the control system 18. In heating mode, the first energy supply unit 21 and the second energy supply unit 22 jointly supply heat, while in cooling mode, the first energy supply unit 21 stores heat. The system is equipped with a water storage unit 25, which provides buffering and temperature regulation. The water storage unit 25 is equipped with a first detection unit 23 (e.g., a first temperature sensor) to monitor the real-time temperature of the water storage unit 25 and transmit the monitoring signal to the control system 18 for intelligent control of the valve opening of the water distribution valve 11.

[0045] See also Figure 2 Optionally, the heating and cooling supply system 40 includes: multiple second detection units 41, a compressor 14, a signal receiving unit (not shown in the figure), an indoor heat exchanger 16, an expansion valve 17, and a reversing valve 15.

[0046] Multiple second detection units 41 are electrically connected to the control system 18. Each second detection unit 41 detects second physical quantity data during the operation of the heating and cooling supply system 40. Each second detection unit 41 includes at least one of a second temperature sensor, a second pressure sensor, and a second flow sensor. The compressor 14 is electrically connected to the control system 18. The control system 18 controls the compressor 14 to compress the working fluid according to the operating mode to increase its temperature. A signal receiving unit is also electrically connected to the control system 18. The signal receiving unit acquires the target temperature set by the user and transmits it to the control system 18. The indoor heat exchanger 16 regulates the current temperature on the user side. The expansion valve 17 is electrically connected to the control system 18. The control system 18 controls the expansion valve 17 to expand the working fluid according to the operating mode to regulate its flow rate. The reversing valve 15 is electrically connected to the control system 18. The control system 18 controls the operation of the reversing valve 15 according to the operating mode to switch the flow direction of the working fluid.

[0047] Specifically, in heating mode, the control system 18 controls the compressor 14 to compress the working fluid after heat exchange flowing out of the outdoor heat exchanger 13, thereby increasing the temperature of the working fluid, and controls the expansion valve 17 to expand the working fluid after heat exchange flowing out of the indoor heat exchanger 16, thereby regulating the flow rate of the working fluid.

[0048] In cooling mode, the control system 18 controls the compressor 14 to compress the working fluid after heat exchange flowing out of the indoor heat exchanger 16, thereby increasing the temperature of the working fluid, and controls the expansion valve 17 to expand the working fluid after heat exchange flowing out of the outdoor heat exchanger 13, thereby regulating the flow rate of the working fluid.

[0049] See also Figure 2 The specific working process of this system is as follows: In heating mode, the circulating water in the first circulation pipeline extracts heat from the ground through the first energy supply unit 21 to form circulating water with a first temperature (medium-low temperature hot water). The circulating water with the first temperature is then exchanged with the second energy supply unit 22 to form circulating water with a second temperature (medium temperature hot water). The circulating water with the second temperature is then exchanged with the hot and cold supply system 40 through the outdoor heat exchanger 13 to form circulating water with a third temperature (low temperature hot water), and is then transported to the first energy supply unit 21 through the first circulation pipeline. The third temperature is lower than the first temperature, and the first temperature is lower than the second temperature. The working fluid in the second circulation pipeline extracts heat from the geothermal system 20 through the outdoor heat exchanger 13 and is compressed by the compressor 14 to form a working fluid with a fourth temperature. The working fluid with the fourth temperature is then exchanged with the indoor heat exchanger 16 to supply heat to the user side, forming a working fluid with a fifth temperature (low temperature working fluid). After being expanded by the expansion valve 17, it is transported to the outdoor heat exchanger 13 through the second circulation pipeline for recirculation. The fifth temperature is lower than the fourth temperature.

[0050] In cooling mode, the circulating water in the first circulation pipeline extracts heat from the heating and cooling supply system 40 through the outdoor heat exchanger 13, forming circulating water with a sixth temperature. This circulating water with the sixth temperature is then transferred to the first energy supply unit 21, which stores the heat carried by the circulating water in the ground, forming circulating water with a seventh temperature. This circulating water with the seventh temperature circulates and exchanges heat through the outdoor heat exchanger 13; the seventh temperature is lower than the sixth temperature. The working fluid in the second circulation pipeline exchanges heat through the outdoor heat exchanger 13 to form a working fluid with an eighth temperature (low-temperature working fluid). This working fluid with the eighth temperature enters the indoor heat exchanger 16 through the expansion valve 17 for heat exchange, outputting a cold source to the user side, forming a working fluid with a ninth temperature. After the compressor 14 increases the pressure and temperature, this working fluid is transferred through the second circulation pipeline to the outdoor heat exchanger 13, where it is cooled by the cold source of the geothermal system 20 and continues to circulate; the ninth temperature is higher than the eighth temperature. In summary, the connection channels of the first and second circulation pipes are different in the heating mode. The connection relationships between the functional units of the heating and cooling system in the heating mode and the connection relationships between the functional units of the heating and cooling system in the cooling mode will be explained separately below.

[0051] Figure 3 This is a schematic diagram showing the connection relationships between the functional units of a heating and cooling system in heating mode. Figure 4 This is a schematic diagram showing the connection relationships between the functional units of the heating and cooling system in cooling mode. (See attached diagram) Figure 3 and Figure 4 In this diagram, solid black lines represent process flow lines, short dashed lines represent signal input lines, and dotted dashed lines represent signal output lines. Based on the above embodiments, optionally, the first power supply unit 21 includes a shallow buried pipe 7, a shallow geothermal water supply pump 8, and a shallow geothermal return water pump 12; the second power supply unit 22 includes a medium-deep geothermal production well 1, a medium-deep geothermal reinjection well 2, a plate heat exchanger 6, a cyclone separator 3, a medium-deep water supply pump 4, and a medium-deep return water pump 5; and the water storage unit 25 includes a first water storage tank 9 and a second water storage tank 10. The shallow geothermal water supply pump 8, the shallow geothermal return water pump 12, the medium-deep water supply pump 4, and the medium-deep return water pump 5 are all electrically connected to the control system 18.

[0052] The shallow buried pipe 7 is connected between the first side of the shallow geothermal water supply pump 8 and the first side of the shallow geothermal return water pump 12. The second side of the shallow geothermal water supply pump 8 is connected to the first side of the plate heat exchanger 6. The second side of the plate heat exchanger 6 is connected to the first side of the first water storage tank 9. The second side of the first water storage tank 9 is connected to the first end of the water distribution valve 11. The second end of the water distribution valve 11 is connected to the second side of the outdoor heat exchanger 13. The first side of the outdoor heat exchanger 13 is connected to the second side of the shallow geothermal return water pump 12. The first side of the second water storage tank 10 is connected to the second side of the shallow geothermal water supply pump 8. The second side of the second water storage tank 10 is connected to the third end of the water distribution valve 11. The medium-deep geothermal production well 1 is connected to the first side of the cyclone desander 3, the second side of the cyclone desander 3 is connected to the first side of the medium-deep water supply pump 4, the second side of the medium-deep water supply pump 4 is connected to the first side of the plate heat exchanger 6, the second side of the plate heat exchanger 6 is connected to the first side of the medium-deep return water pump 5, and the second side of the medium-deep return water pump 5 is connected to the medium-deep geothermal reinjection well 2.

[0053] The first water storage tank 9 is a hot water tank, and the second water storage tank 10 is a cold water tank. The water storage tanks are used for energy storage. By setting up hot water tanks, cold water tanks, and a three-way water distribution valve, intelligent switching between heating and cooling modes can be achieved, water pressure can be balanced, and energy storage can be performed to ensure uninterrupted and controllable hot and cold water supply.

[0054] The shallow geothermal system comprises a shallow geothermal system consisting of a shallow underground pipe 7, a shallow geothermal water supply pump 8, and a shallow geothermal return water pump 12. The medium-deep geothermal production well 1, the medium-deep geothermal reinjection well 2, the plate heat exchanger 6, the cyclone separator 3, the medium-deep water supply pump 4, and the medium-deep return water pump 5 constitute an open medium-deep geothermal system. Medium-deep geothermal water enters the plate heat exchanger 6 through the cyclone separator 3 and exchanges heat with the heating and cooling supply system 40 via circulating water. The water produced from the medium-deep geothermal production well 1 has a complex composition; the cyclone separator 3 treats the water, inhibiting scaling and clogging of the plate heat exchanger 6, reducing cleaning frequency, and improving system stability. The closed-loop system, acting as a heat carrier, does not directly contact the open medium-deep geothermal system or the heating and cooling supply system, effectively increasing system lifespan and reducing maintenance costs.

[0055] Furthermore, the geothermal system 20 can couple shallow geothermal systems and medium-deep geothermal systems. The shallow geothermal system can be used for the cooling and heating needs of the entire system, while the medium-deep geothermal system can be used for the peak-shaving needs of the heating scheme. Based on the real-time heat demand on the user side and the current operating conditions reflected by the readings of each sensor, the required operating conditions to meet the heat demand are calculated and controlled through the control algorithm.

[0056] See also Figure 3 and Figure 4 Optionally, a first detection unit 23 is disposed on the first side of the shallow buried pipe 7. The first detection unit 23 includes a first temperature sensor 231, a first pressure sensor 232, and a first flow sensor 233, used to acquire the first temperature value, first pressure value, and first flow value of the shallow buried pipe 7. A first detection unit 23 is disposed on the first side of the medium-deep water supply pump 4. The first detection unit 23 includes a first temperature sensor 231, a first pressure sensor 232, and a first flow sensor 233, used to acquire the first temperature value, first pressure value, and first flow value of the water extracted by the medium-deep water supply pump 4. That is, by installing the first temperature sensor 231, the first pressure sensor 232, and the first flow sensor 233 at the outlet, the extracted water of the geothermal system 20 can be monitored, and the monitoring signal can be transmitted to the control system 18 for intelligent control. First detection units 23 are respectively disposed on the surface of the first water storage tank 9 and the surface of the second water storage tank 10. The first detection unit 23 includes a first temperature sensor 231. The first detection unit 23 is located on the second side of the outdoor heat exchanger 13. The first detection unit 23 includes a first temperature sensor 231 and a first pressure sensor 232.

[0057] See also Figure 3 and Figure 4 Optionally, the first detection unit 23 is disposed on the second side of the shallow geothermal water supply pump 8, and the first detection unit 23 includes a first temperature sensor 231.

[0058] The first detection unit 23 is located on the second side of the medium-deep return water pump 5, and the first detection unit 23 includes a first pressure sensor 232.

[0059] The first detection unit 23 is located on the first side of the outdoor heat exchanger 13 near the geothermal system 20. The first detection unit 23 includes a first temperature sensor 231.

[0060] See also Figure 3 and Figure 4 Optionally, the second detection unit 41 is disposed on both sides of the indoor heat exchanger 16, and the second detection unit 41 includes a second temperature sensor 411, a second pressure sensor 412, and a second flow sensor 413. The second detection unit 41 is disposed on the second side of the compressor 14, and the second detection unit 41 includes a second temperature sensor 411, a second pressure sensor 412, and a second flow sensor 413.

[0061] The second pressure sensor 412 is located on the first side of the indoor heat exchanger 16 near the geothermal system 20, and the second temperature sensor 411 and the second flow sensor 413 are located on the second side of the indoor heat exchanger 16 near the geothermal system 20.

[0062] See also Figure 3 and Figure 4 Optionally, the second detection unit 41 is disposed on the first side of the expansion valve 17, and the second detection unit 41 includes a second pressure sensor 412.

[0063] The second detection unit 41 is located on the first side of the outdoor heat exchanger 13 near the heating and cooling supply system 40. The second detection unit 41 includes a second temperature sensor 411.

[0064] By installing a second temperature sensor 411, a second pressure sensor 412, and a second flow sensor 413 on the second side (outlet) of the compressor 14, the properties of the compressed working fluid can be monitored in real time and fed back to the control system 18. The second temperature sensor 411 is configured at both ends of the indoor heat exchanger 16. The output of this structure is the most critical parameter input for the control system 18, which is then used for real-time optimization and adjustment.

[0065] See Figure 3 The reversing valve 15 is a four-way reversing valve used for switching the pipeline path between cooling mode and heating mode.

[0066] The control system 18 is also used to connect the first side (inlet) of the compressor 14 to the second side (right side) of the indoor heat exchanger 16 and the second side (outlet) of the compressor 14 to the first side (left side) of the outdoor heat exchanger 13 when the current temperature on the user side is greater than the target required temperature (cooling mode). It also controls the mid-depth water supply pump 4, the mid-depth water return pump 5 and the plate heat exchanger 6 to close, and controls the water distribution valve 11 to connect the first water storage tank 9 and the outdoor heat exchanger 13.

[0067] When the current temperature on the user side is lower than the target required temperature (heating mode), the four-way reversing valve connects the first side (inlet) of the compressor 14 to the first side (left side) of the outdoor heat exchanger 13, and connects the second side (outlet) of the compressor 14 to the second side (right side) of the indoor heat exchanger 16. It also controls the opening of the medium-deep water supply pump 4, the medium-deep water return pump 5 and the plate heat exchanger 6, and controls the water distribution valve 11 to connect the second water storage tank 10 and the outdoor heat exchanger 13.

[0068] That is, the heating and cooling supply system can automatically switch between heating and cooling modes according to user needs through the control system 18. This function can be achieved by switching the connection channel through a four-way reversing valve, and the switching is intelligently controlled by the control system 18. The connection sequence for the heating mode is: outdoor heat exchanger 13 → compressor 14 → indoor heat exchanger 16 → expansion valve 17 → outdoor heat exchanger 13; the connection sequence for the cooling mode is: indoor heat exchanger 16 → compressor 14 → outdoor heat exchanger 13 → expansion valve 17 → indoor heat exchanger 16.

[0069] It is understandable that the outdoor heat exchanger 13 can be divided into a first side and a second side located on one side of the geothermal system 20, and a first side and a second side located on one side of the heating and cooling supply system 40.

[0070] See Figure 3 The technical principle of the heating solution is as follows: The circulating water in the first circulation pipeline extracts heat from the ground through the shallow buried pipe 7, and the medium-low temperature hot water is pumped to the plate heat exchanger 6 to exchange heat with the medium-deep geothermal system, further increasing the temperature of the circulating water. The heated medium-temperature circulating water then exchanges heat with the heating and cooling supply system 40 through the outdoor heat exchanger 13. After heat exchange, the low-temperature hot water returns to the shallow geothermal system for recirculation. During heating, the heating and cooling supply system 40 uses an organic working fluid to extract heat from the geothermal system 20 through the outdoor heat exchanger 13. After passing through the compressor 14 to increase the pressure and temperature, it supplies the temperature to the user side through the indoor heat exchanger 16. After heat exchange, the low-temperature working fluid expands through the expansion valve 17 and then enters the outdoor heat exchanger 13 for recirculation. In other words, in the heating mode, the low-temperature water first passes through the shallow buried pipe system with a lower temperature, and the heated medium-low temperature water exchanges heat with the medium-temperature water extracted from the medium-deep geothermal production well 1. This multi-stage heat exchange method reduces the temperature difference and improves the heat exchange efficiency. The heat contribution ratio between shallow buried pipe systems and medium-deep geothermal systems can be optimized in real time based on heat exchange temperature and efficiency, thereby adjusting the flow rate to achieve the optimal operating ratio.

[0071] See Figure 4 The technical principle of the refrigeration solution is as follows: The circulating water in the first circulation pipeline extracts heat from the heating and cooling supply system 40 via the outdoor heat exchanger 13 and is pumped to the shallow underground pipe 7, where its heat is stored in the ground. The cooled circulating water then circulates again through the outdoor heat exchanger 13 for heat exchange. During cooling, the organic working fluid in the heating and cooling supply system 40 is cooled by the outdoor heat exchanger 13. The low-temperature working fluid passes through the expansion valve 17 and enters the indoor heat exchanger 16, supplying cold to the user side. The heated working fluid enters the compressor 14, where its pressure and temperature are increased before it is cooled by the geothermal cold source through the outdoor heat exchanger 13 and continues to circulate. In other words, in cooling mode, medium-temperature water can use the shallow underground pipe system (shallow geothermal system) to bury heat from the user side into the ground, which is beneficial for shallow ground temperature recovery and heat replenishment, maintaining stable ground temperature and increasing the heat exchange capacity in heating mode.

[0072] In summary, the heating and cooling supply system adopts the reverse Carnot cycle, which consists of four processes: the compression process of the compressor, the expansion process of the expansion valve, the heat absorption (heating) / heat release (cooling) process of the outdoor heat exchanger, and the heat release (heating) / heat absorption (cooling) process of the indoor heat exchanger.

[0073] In short, the working principle of the heating circulation is as follows: The low-temperature, high-pressure liquid working fluid is throttled by the expansion valve and becomes a low-temperature, low-pressure liquid working fluid. It then enters the outdoor heat exchanger to evaporate and absorb heat, thus absorbing a large amount of heat from the geothermal system.

[0074] After evaporation and heat absorption, the working fluid enters the compressor in gaseous form. After being compressed, it becomes a high-temperature and high-pressure gaseous working fluid.

[0075] The compressed, high-temperature, and high-pressure working fluid enters the indoor heat exchanger and releases its heat to the user side.

[0076] After releasing heat, the low-temperature, high-pressure working fluid enters the expansion valve in liquid form, throttling and reducing pressure, and continues to circulate.

[0077] The working principle of the refrigeration cycle is as follows: The low-temperature, high-pressure liquid working fluid is throttled by the expansion valve and becomes a low-temperature, low-pressure liquid working fluid. It then enters the indoor heat exchanger to evaporate and absorb heat, thus absorbing a large amount of heat from the user side.

[0078] After evaporation and heat absorption, the working fluid enters the compressor in gaseous form. After being compressed, it becomes a high-temperature and high-pressure gaseous working fluid.

[0079] The compressed, high-temperature, and high-pressure working fluid enters the outdoor heat exchanger, releasing its heat to the geothermal system.

[0080] After releasing heat, the low-temperature, high-pressure working fluid enters the expansion valve in liquid form, throttling and reducing pressure, and continues to circulate.

[0081] In summary, the heating and cooling system provided in this embodiment of the invention monitors the parameters of the shallow buried pipe in real time by installing a first temperature sensor, a first pressure sensor, and a first flow sensor. The outlet of the shallow buried pipe is connected to a shallow geothermal water supply pump. In heating mode, circulating water is sent to a plate heat exchanger, where it exchanges heat with medium-deep geothermal water before entering a hot water tank. In cooling mode, it is directly sent to a cold water tank. The water tank is equipped with a first temperature sensor and external thermal insulation material. The outlet of the water tank is connected to a three-way water distribution valve, which can automatically switch modes according to the specified mode. For example, in heating mode, the produced water from the medium-deep geothermal production well is desanded by a cyclone separator and then pumped by the medium-deep water supply pump into the plate heat exchanger to exchange heat with the circulating water in the heating mode. It is then pressurized and reinjected by the medium-deep return water pump. The outlet of the three-way water distribution valve is connected to an outdoor heat exchanger, where it exchanges heat with the working fluid of the heating and cooling supply system. The outlet of the outdoor heat exchanger is connected to a shallow geothermal return water pump.

[0082] This invention also provides a control method for a heating and cooling system, used to drive the heating and cooling system provided in any of the above embodiments, and executed by a control system. Figure 5 A flowchart of a control method for a heating and cooling system provided in an embodiment of the present invention is shown below. Figure 5 The control methods for heating and cooling systems include: S110. Obtain the first physical quantity data during the operation of the geothermal system.

[0083] S120: Obtain the second physical quantity data and the target demand temperature on the user side during the operation of the heating and cooling supply system.

[0084] S130. Based on the first physical quantity data, the second physical quantity data, and the target required temperature, output control signals to the geothermal system and the heating and cooling supply system.

[0085] The technical solution of this invention enables the control system to understand the heating and cooling status in real time, dynamically calculate the energy required by the user side, and flexibly adjust the temperature to achieve real-time response to the user side's heating and cooling needs. This can improve the sensitivity of the user side's response to heating and cooling needs, improve the energy efficiency of the heating and cooling system, and avoid the problem of heat and electricity waste caused by supply and demand mismatch.

[0086] Figure 6 A flowchart illustrating another control method for a heating and cooling system provided in an embodiment of the present invention is provided, specifically a schematic diagram of the control theory of the present invention. See also... Figure 6 The control methods for heating and cooling systems include: S201. Obtain the indoor temperature detected by the second temperature sensor.

[0087] S202. Determine if the indoor temperature is higher than the set temperature; if yes, proceed to S203; if no, proceed to S211.

[0088] S203, control to turn on the cooling mode.

[0089] S204. Control the start of the shallow geothermal water supply pump.

[0090] S205, Control the start of the shallow geothermal return water pump.

[0091] S206. Control and shut down the medium-deep water supply pump.

[0092] S207. Control the shutdown of the medium-deep return water pump.

[0093] S208, Control the shutdown of the plate heat exchanger.

[0094] S209, Control switching directional valve.

[0095] S210, control the switching of the water distribution valve.

[0096] S211, control to turn on heating mode.

[0097] S212, Control the start of the shallow geothermal water supply pump.

[0098] S213, Control the start of the shallow geothermal return water pump.

[0099] S214. Control the start of the medium-deep water supply pump.

[0100] S215, Control the start of the medium-deep return water pump.

[0101] S216, Control the start of the plate heat exchanger.

[0102] S217, Control switching directional valve.

[0103] S218, Control the switching of the water distribution valve.

[0104] S219. Calculate the error between the current state and the set value, execute the control algorithm, and generate a control signal.

[0105] S220, Control the expansion valve.

[0106] S221. Control the compressor.

[0107] S222, Control the shallow geothermal water supply pump.

[0108] S223. Control the medium-deep water supply pump.

[0109] S224. Control the indoor heat exchanger.

[0110] S225. Wait for a preset time to obtain the indoor temperature detected by the second temperature sensor again.

[0111] Based on the above embodiments, optionally, control signals are output to the geothermal system and the heating / cooling supply system according to the first physical quantity data, the second physical quantity data, and the target required temperature, including: Based on the first and second physical quantity data, and considering the target required temperature and system efficiency ( To optimize performance, physical constraint technology is used to output control signals to the geothermal system and the heating and cooling supply system. The control strategy provided in this invention avoids drastic fluctuations in the system's output control signals and frequent system start-ups and shutdowns, significantly reducing fatigue wear on key mechanical components such as compressors, pumps, and valves, extending equipment lifespan, and lowering maintenance costs. Furthermore, by prioritizing the target temperature, the room temperature or water supply temperature on the user side can be controlled more precisely and stably, greatly improving comfort.

[0112] Based on the above embodiments, optionally, the geothermal system includes a shallow geothermal water supply pump, a shallow geothermal return water pump, a medium-deep geothermal water supply pump, a medium-deep geothermal return water pump, a first water storage tank, a second water storage tank, and a water distribution valve; the heating and cooling supply system includes an expansion valve, a compressor, a reversing valve, and an indoor heat exchanger. Output control signals to the geothermal system and the heating and cooling supply system, including: Control signals are output to the shallow geothermal water supply pump, shallow geothermal return pump, medium-deep geothermal water supply pump, medium-deep geothermal return pump, first water storage tank, second water storage tank, water distribution valve, expansion valve, compressor, and reversing valve to adjust the pump power of the shallow geothermal water supply pump, shallow geothermal return pump, medium-deep geothermal water supply pump, and medium-deep geothermal return pump. Adjust the mass flow rate of the second side of the first water tank and the second side (outlet) of the second water tank. Adjust the valve direction of the water distribution valve and adjust the opening of the expansion valve. and Adjust the compressor power. Adjusting the valve direction of the reversing valve, and adjusting the temperature of the first / second side of the indoor heat exchanger. To match user needs and achieve the optimal operating state of the system.

[0113] Based on the above embodiments, optionally, in the heating mode, the first opening degree of the expansion valve... The calculation formula is: In cooling mode, the second opening degree of the expansion valve The calculation formula is: in, The mass flow rate of the working fluid. The flow coefficient of the expansion valve is... The density of the refrigerant gas, The pressure on the first side of the expansion valve. This refers to the pressure on the second side of the expansion valve.

[0114] Based on the above embodiments, the control system may optionally also be used to calculate the user-side flow rate of the indoor heat exchanger; Indoor heat exchanger user-side flow The calculation formula is: in, The specific heat capacity of indoor air. The temperature on the first side of the indoor heat exchanger. The temperature on the second side of the indoor heat exchanger. This is the current indoor temperature. Set the temperature for the user. For the working fluid mass flow rate, This is the specific heat capacity of the working fluid.

[0115] Optionally, the control system is also used to calculate the compressor power; compressor power The calculation formula is: in, This is the enthalpy value on the first side of the compressor. The enthalpy value on the second side of the compressor is calculated using the open-source fluid property calculation package Coolprop based on the pressure measured on the first side of the compressor. ,temperature Pressure on the second side of the compressor ,temperature Obtained through calculation.

[0116] Optionally, the control system is also used to calculate the flow rate of the shallow buried pipes of the geothermal system; Flow rate of shallow buried pipes in geothermal systems The calculation formula is: in, For the working fluid mass flow rate, The specific heat capacity of the working fluid, The temperature on the first side of the indoor heat exchanger. This refers to the temperature on the first side of the outdoor heat exchanger. The outlet temperature of the first water tank / second water tank. This refers to the inlet temperature of the shallow buried pipe. This is the specific heat capacity of water.

[0117] Optionally, the control system is also used to calculate the flow rate of deep geothermal production wells in the geothermal system; Flow rate of deep geothermal production wells in geothermal systems The calculation formula is: in, This refers to the mass flow rate of shallow geothermal wells in a geothermal system. The outlet temperature of the first water tank / second water tank. Temperature at the inlet of shallow buried pipes. This refers to the temperature of deep geothermal production wells in a geothermal system. This is the outdoor temperature, which can be set by the user.

[0118] Optionally, the control system is also used to calculate the controller output value and adjust it in real time; The calculation method for the control system is as follows: in, For the control quantities of expansion valves, indoor heat exchangers, compressors, shallow geothermal water supply pumps, and medium-deep geothermal water supply pumps, This is the difference between the measured value and the set value. The measured value includes the expansion valve opening in heating / cooling mode. User-side flow rate of indoor heat exchanger Compressor power Shallow buried pipe flow Flow rate of medium-deep geothermal production wells The setpoints include the first opening degree of the expansion valve. The second opening degree of the expansion valve User-side flow rate of indoor heat exchanger Compressor power Shallow geothermal water supply pump flow rate Medium-deep water supply pump flow rate , The number of operations. , , These are the proportional adjustment coefficient, integral adjustment coefficient, and derivative adjustment coefficient, respectively.

[0119] Optionally, the control system is also used to calculate system efficiency and adjust it in real time; System efficiency The calculation method is as follows: in, For the user-side flow rate of the indoor heat exchanger, The specific heat capacity of indoor air. Set the temperature for the user. This is the current indoor temperature. For compressor power, For shallow geothermal water supply pump flow rate, For shallow buried pipe pressure, For the outlet pressure of the first water storage tank / second water storage tank, For the flow rate of medium and deep water supply pumps, For the pressure of medium-deep geothermal reinjection wells, This refers to the pressure of medium-deep geothermal production wells.

[0120] In summary, the control method for the heating and cooling system provided in this embodiment of the invention uses terminal detection sensors (first detection unit and second detection unit) as input, and user demand information, efficiency, energy consumption, and safety indicators from the signal receiving unit as optimization factors. Through physical constraint technology, the control system outputs control signals to control the terminal equipment. The terminal equipment includes a shallow geothermal water supply pump, a shallow geothermal return water pump, a medium-deep geothermal water supply pump, and a medium-deep geothermal return water pump.

[0121] The input signal to the control system is: shallow buried pipe temperature. ,pressure mass flow rate Temperature of produced water from medium-deep geothermal production wells ,pressure mass flow rate Water injection pressure in medium-deep geothermal reinjection wells Hot and cold water tank temperatures ,pressure Pressure on the left side of the expansion valve Right-side pressure outdoor heat exchanger heating and cooling supply system first side temperature compressor outlet temperature ,pressure mass flow rate The inlet temperature on the left side of the indoor heat exchanger heating and cooling supply system. Right side inlet temperature User-side flow rate of indoor heat exchanger Current indoor temperature User-set temperature .

[0122] Understandably, the control system can also be used to collect information sent by users from terminals such as mobile phones and computers. By combining the control system with factors such as energy efficiency and energy consumption, the power supply, water pump power, valve opening, etc. on the energy supply side (heat source measurement) can be optimized and adjusted to achieve the effect of improving the system's energy efficiency by 5%-10%.

[0123] In summary, this invention provides a heating and cooling system and its control method, which can be used for the design of geothermal heating and cooling systems, as well as for the conversion of geothermal energy, heating and cooling supply systems and control systems of geothermal systems into electrical energy, mechanical energy and thermal energy, and can intelligently control the above-mentioned energy forms.

[0124] Furthermore, it can match the intermittent heating demands of the heat source and the user (load) side, and allows users to monitor the real-time heating and cooling status via electronic devices such as computers and mobile phones, enabling flexible temperature adjustments and more convenient and efficient heating management. In other words, this invention designs a heating system and its control conditions that can respond to user-side heat demands in real time while ensuring high efficiency and low cost, achieving a green heating system throughout the entire process.

[0125] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0126] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A heating and cooling system, characterized in that, include: Control system; The geothermal system is connected to the first circulation pipeline and electrically connected to the control system. The geothermal system is used for heat production in heating mode and heat storage in cooling mode, and transmits the first physical quantity data during operation to the control system. The outdoor heat exchanger is connected to the first circulation pipeline and the second circulation pipeline respectively; A heating and cooling supply system is connected to the second circulation pipeline and electrically connected to the control system. The heating and cooling supply system is used to exchange heat with the geothermal system through the outdoor heat exchanger and to transmit the second physical quantity data during operation and the target demand temperature on the user side to the control system. The control system is used to determine the operating mode based on the current temperature on the user side and the target required temperature, and to compress and expand the working fluid in the second circulation pipeline according to the operating mode; wherein, the operating mode includes heating mode and cooling mode; The control system is also used to output control signals to the geothermal system and the heating and cooling supply system based on the first physical quantity data, the second physical quantity data and the target required temperature.

2. The heating and cooling system according to claim 1, characterized in that, The geothermal system includes: The first energy supply unit is used for heat production in heating mode and heat storage in cooling mode. The second energy supply unit is used for heat production in the heating mode; Multiple first detection units are electrically connected to the control system. The first detection units are used to detect the first physical quantity data during the operation of the geothermal system and transmit it to the control system. The first detection unit includes at least one of a first temperature sensor, a first pressure sensor, and a first flow sensor. Water storage unit; The water distribution valve is electrically connected to the control system. The control system is also used to switch the operating mode by controlling the direction and opening of the water distribution valve in order to balance the water pressure of the water storage unit. The heating and cooling supply system includes: Multiple second detection units are electrically connected to the control system. The second detection units are used to detect the second physical quantity data during the operation of the hot and cold supply system. The second detection unit includes at least one of a second temperature sensor, a second pressure sensor, and a second flow sensor. The compressor is electrically connected to the control system, which controls the compressor to compress the working fluid according to the operating mode in order to increase the temperature of the working fluid. A signal receiving unit is electrically connected to the control system. The signal receiving unit is used to acquire the target required temperature set by the user and transmit it to the control system. Indoor heat exchangers are used to regulate the current temperature on the user side. An expansion valve is electrically connected to the control system, which controls the expansion valve to expand the working fluid according to the operating mode, so as to regulate the flow rate of the working fluid. A reversing valve is electrically connected to the control system, which controls the operation of the reversing valve according to the operating mode to switch the flow direction of the working fluid.

3. The heating and cooling system according to claim 2, characterized in that, In heating mode, the circulating water in the first circulation pipeline extracts heat from the ground through the first energy supply unit to form circulating water with a first temperature, and exchanges heat with the circulating water with the first temperature with the second energy supply unit to form circulating water with a second temperature. The circulating water with a second temperature exchanges heat with the heating and cooling supply system through the outdoor heat exchanger to form circulating water with a third temperature, and is then transported to the first energy supply unit through the first circulation pipeline; wherein the third temperature is lower than the first temperature, and the first temperature is lower than the second temperature. The working fluid in the second circulation pipeline extracts heat from the geothermal system through the outdoor heat exchanger and is compressed by the compressor to form the working fluid with a fourth temperature. The working fluid with the fourth temperature exchanges heat through the indoor heat exchanger to form the working fluid with a fifth temperature. After being expanded by the expansion valve, it is transported to the outdoor heat exchanger through the second circulation pipeline; wherein the fifth temperature is lower than the fourth temperature.

4. The heating and cooling system according to claim 2, characterized in that, In cooling mode, the circulating water in the first circulation pipeline extracts heat from the heating and cooling supply system through the outdoor heat exchanger to form circulating water with a sixth temperature. The circulating water with the sixth temperature is then transferred to the first energy supply unit, which stores the heat carried by the circulating water in the ground to form circulating water with a seventh temperature. The circulating water with the seventh temperature circulates and exchanges heat through the outdoor heat exchanger; wherein, the seventh temperature is lower than the sixth temperature. The working fluid in the second circulation pipeline exchanges heat through the outdoor heat exchanger to form the working fluid with an eighth temperature. The working fluid with the eighth temperature enters the indoor heat exchanger through the expansion valve to exchange heat to form the working fluid with a ninth temperature. After the compressor increases the pressure and temperature, the working fluid is transported to the outdoor heat exchanger through the second circulation pipeline. The ninth temperature is greater than the eighth temperature.

5. The heating and cooling system according to claim 2, characterized in that, The first power supply unit includes a shallow underground pipe, a shallow geothermal water supply pump, and a shallow geothermal return water pump; the second power supply unit includes a medium-deep geothermal production well, a medium-deep geothermal reinjection well, a plate heat exchanger, a cyclone desander, a medium-deep water supply pump, and a medium-deep return water pump; the water storage unit includes a first water storage tank and a second water storage tank. The shallow underground pipe is connected between the first side of the shallow geothermal water supply pump and the first side of the shallow geothermal return water pump. The second side of the shallow geothermal water supply pump is connected to the first side of the plate heat exchanger. The second side of the plate heat exchanger is connected to the first side of the first water storage tank. The second side of the first water storage tank is connected to the first end of the water distribution valve. The second end of the water distribution valve is connected to the second side of the outdoor heat exchanger. The first side of the outdoor heat exchanger is connected to the second side of the shallow geothermal return water pump. The first side of the second water storage tank is connected to the second side of the shallow geothermal water supply pump. The second side of the second water storage tank is connected to the third end of the water distribution valve. The medium-deep geothermal production well is connected to the first side of the cyclone desander, the second side of the cyclone desander is connected to the first side of the medium-deep water supply pump, the second side of the medium-deep water supply pump is connected to the first side of the plate heat exchanger, the second side of the plate heat exchanger is connected to the first side of the medium-deep return water pump, and the second side of the medium-deep return water pump is connected to the medium-deep geothermal reinjection well.

6. The heating and cooling system according to claim 5, characterized in that, The first detection unit is disposed on the first side of the shallow buried pipe, and the first detection unit includes a first temperature sensor, a first pressure sensor and a first flow sensor; And / or, The first detection unit is disposed on the first side of the medium-deep water supply pump, and the first detection unit includes a first temperature sensor, a first pressure sensor and a first flow sensor; And / or, The first detection unit is respectively disposed on the surface of the first water tank and the surface of the second water tank, and the first detection unit includes a first temperature sensor; And / or, The first detection unit is located on the second side of the outdoor heat exchanger, and the first detection unit includes a first temperature sensor and a first pressure sensor.

7. The heating and cooling system according to claim 5, characterized in that, The second detection unit is disposed on both sides of the indoor heat exchanger, and the second detection unit includes a second temperature sensor; And / or, The second detection unit is located on the second side of the compressor, and the second detection unit includes a second temperature sensor, a second pressure sensor, and a second flow sensor.

8. The heating and cooling system according to claim 5, characterized in that, The reversing valve is a four-way reversing valve; The control system is also used to connect the first side of the compressor to the second side of the indoor heat exchanger and the second side of the compressor to the first side of the outdoor heat exchanger when the current temperature on the user side is greater than the target required temperature. It also controls the mid-depth water supply pump, the mid-depth water return pump and the plate heat exchanger to shut down, and controls the water distribution valve to connect the first water storage tank and the outdoor heat exchanger. When the current temperature on the user side is lower than the target required temperature, the four-way reversing valve connects the first side of the compressor to the first side of the outdoor heat exchanger and the second side of the compressor to the second side of the indoor heat exchanger, and controls the opening of the medium-deep water supply pump, the medium-deep water return pump and the plate heat exchanger, and controls the water distribution valve to connect the second water storage tank and the outdoor heat exchanger.

9. A control method for a heating and cooling system, characterized in that, For controlling the heating and cooling system according to any one of claims 1-8, and executed by the control system; The control method for the heating and cooling system includes: Acquire the first physical quantity data during the operation of the geothermal system; Acquire the second physical quantity data and the target demand temperature on the user side during the operation of the heating and cooling supply system; Based on the first physical quantity data, the second physical quantity data, and the target required temperature, control signals are output to the geothermal system and the heating and cooling supply system.

10. The control method for a heating and cooling system according to claim 9, characterized in that, Based on the first physical quantity data, the second physical quantity data, and the target required temperature, control signals are output to the geothermal system and the heating and cooling supply system, including: Based on the first physical quantity data and the second physical quantity data, and taking the target demand temperature, system efficiency, and system energy consumption as optimization objectives, physical constraint technology is used to output control signals to the geothermal system and the heating and cooling supply system.

11. The control method for a heating and cooling system according to claim 10, characterized in that, The geothermal system includes a shallow geothermal water supply pump, a shallow geothermal return water pump, a medium-deep geothermal water supply pump, a medium-deep geothermal return water pump, a first water storage tank, a second water storage tank, and a water distribution valve; the heating and cooling supply system includes an expansion valve, a compressor, a reversing valve, an outdoor heat exchanger, and an indoor heat exchanger. The step of outputting control signals to the geothermal system and the heating and cooling supply system includes: Control signals are output to the shallow geothermal water supply pump, the shallow geothermal return pump, the medium-deep geothermal water supply pump, the medium-deep geothermal return pump, the first water storage tank, the second water storage tank, the water distribution valve, the expansion valve, the compressor, and the reversing valve to adjust the pump power of the shallow geothermal water supply pump, the shallow geothermal return pump, the medium-deep geothermal water supply pump, and the medium-deep geothermal return pump; adjust the mass flow rate of the second side of the first water storage tank and the second side of the second water storage tank; adjust the valve direction of the water distribution valve; adjust the opening of the expansion valve; adjust the power of the compressor; adjust the valve direction of the reversing valve; and adjust the temperature of the first / second side of the indoor heat exchanger.

12. The control method for a heating and cooling system according to claim 11, characterized in that, In heating mode, the first opening degree of the expansion valve The calculation formula is: In cooling mode, the second opening degree of the expansion valve The calculation formula is: in, The mass flow rate of the working fluid. The flow coefficient of the expansion valve is... The density of the refrigerant gas, The pressure on the first side of the expansion valve. This refers to the pressure on the second side of the expansion valve.

13. The control method for a heating and cooling system according to claim 12, characterized in that, The control system is also used to calculate the user-side flow rate of the indoor heat exchanger. The user-side flow rate of the indoor heat exchanger The calculation formula is: in, The specific heat capacity of indoor air. The temperature on the first side of the indoor heat exchanger. The temperature on the second side of the indoor heat exchanger. This is the current indoor temperature. Set the temperature for the user. For the working fluid mass flow rate, This is the specific heat capacity of the working fluid.

14. The control method for a heating and cooling system according to claim 13, characterized in that, The control system is also used to calculate the compressor power; The power of the compressor The calculation formula is: in, The enthalpy value of the first side of the compressor. The enthalpy value is the value on the second side of the compressor.

15. The control method for a heating and cooling system according to claim 14, characterized in that, The geothermal system includes a first energy supply unit, which includes a shallow buried pipe. The control system is also used to calculate the flow rate of the shallow buried pipes of the geothermal system. The flow rate of the shallow buried pipe of the geothermal system The calculation formula is: in, For the working fluid mass flow rate, The specific heat capacity of the working fluid, The temperature on the first side of the indoor heat exchanger. The temperature on the first side of the outdoor heat exchanger. The outlet temperature of the first water tank / second water tank. This refers to the inlet temperature of the shallow buried pipe. This is the specific heat capacity of water.

16. The control method for a heating and cooling system according to claim 15, characterized in that, The geothermal system includes a second energy supply unit, which includes a medium-deep geothermal production well. The control system is also used to calculate the flow rate of deep geothermal production wells in the geothermal system. Flow rate of deep geothermal production wells in the geothermal system The calculation formula is: in, This refers to the flow rate of the shallow geothermal water supply pump in the geothermal system. The outlet temperature of the first water tank / second water tank. Temperature at the inlet of shallow buried pipes. This refers to the temperature of deep geothermal production wells in a geothermal system. This refers to the outdoor temperature.

17. The control method for a heating and cooling system according to claim 16, characterized in that, The geothermal system includes multiple first detection units, and the hot and cold supply system includes multiple second detection units; The control system calculates and adjusts the output value of the control system in real time based on the user-side flow rate of the indoor heat exchanger, the first opening degree of the expansion valve, the second opening degree of the expansion valve, the user-side flow rate of the indoor heat exchanger, the compressor power, the flow rate of the shallow buried pipe of the geothermal system, the flow rate of the deep geothermal production well in the geothermal system, and the feedback values ​​of multiple first detection units and multiple second detection units. The calculation method for the control system is as follows: in, For the control quantities of expansion valves, indoor heat exchangers, compressors, shallow geothermal water supply pumps, and medium-deep geothermal water supply pumps, This is the difference between the measured value and the set value. The measured value includes the expansion valve opening in heating / cooling mode. User-side flow rate of indoor heat exchanger Compressor power Shallow buried pipe flow Flow rate of medium-deep geothermal production wells The setpoints include the first opening degree of the expansion valve. The second opening degree of the expansion valve User-side flow rate of indoor heat exchanger Compressor power Shallow geothermal water supply pump flow rate Medium-deep water supply pump flow rate , The number of operations. , , These are the proportional adjustment coefficient, integral adjustment coefficient, and derivative adjustment coefficient, respectively.

18. The control method for a heating and cooling system according to claim 17, characterized in that, The control system is also used to calculate system efficiency and implement regulation; The system efficiency The calculation method is as follows: in, For the user-side flow rate of the indoor heat exchanger, The specific heat capacity of indoor air. Set the temperature for the user. This is the current indoor temperature. For compressor power, For shallow geothermal water supply pump flow rate, For shallow buried pipe pressure, For the outlet pressure of the first water storage tank / second water storage tank, For the flow rate of medium and deep water supply pumps, For the pressure of medium-deep geothermal reinjection wells, This refers to the pressure of medium-deep geothermal production wells.

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