Composite cold and heat source system and control method thereof

Abstract

The invention discloses a combined cold and heat source system and a control method thereof. The system comprises a control module, an air source heat pump unit, a ground source heat pump unit, an external connection mechanism used for being connected with a load side, a circulation loop comprising a water delivery main pipeline and a water return main pipeline, a monitoring module used for detecting temperature and flow and in communication connection with the control module, and a switching module in communication connection with the control module. The first output pipeline and the first input pipeline are connected through a bypass pipeline, the switching module is connected with the first output pipeline, the first input pipeline and the bypass pipeline, and the control module can control the switching module according to information of the detection module, so that the air source heat pump unit enters an anti-freezing mode through self-circulation in a low-temperature environment. Through structural improvement, when the air source heat pump is not started in winter, the ground source heat pump does not need to supply heat for the air source heat pump for freezing prevention any more, and freezing prevention can be achieved only through self-circulation of water in the air source heat pump through the switching module.

Description

Technical Field

[0001] This invention relates to the field of cold and heat source system technology, and in particular to a composite cold and heat source system and its control method. Background Technology

[0002] The composite air source heat pump system combines ground source heat pumps and air source heat pumps, taking into account both energy efficiency and stability. Therefore, it is widely used in new buildings for water supply, heating and cooling needs.

[0003] Among them, ground source heat pumps have the advantage of high efficiency and energy saving. They are given priority to be turned on during the initial operation to reduce energy consumption. However, when air source heat pumps are shut down for a long time, the water in their pipes is prone to freezing and cracking when the outdoor temperature is below zero, which can lead to equipment damage and system failure.

[0004] In existing technologies, if an air source heat pump is turned on for freeze protection, there will be ineffective heat loss due to the lack of actual heating demand; if a ground source heat pump is used to heat the air source heat pump pipeline, the ineffective heat loss will be further increased due to the excessively high water temperature, resulting in energy waste. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a composite cold and heat source system and its control method. By setting up a switching module and a control module, the structure is improved so that when the air source heat pump is not started in winter, the ground source heat pump is no longer needed to provide heating and antifreeze for the air source heat pump. Antifreeze can be achieved simply by using the switching module to make the water in the air source heat pump self-circulate.

[0006] The present invention provides a composite cold and heat source system, including a control module, an air source heat pump unit, a ground source heat pump unit, an external connection mechanism for connecting to the load side, a circulation loop including a main water supply pipeline and a main return water pipeline, a monitoring module for detecting temperature and flow rate and communicating with the control module, and a switching module communicating with the control module. The water distribution end and water collection end of the external connection mechanism are respectively connected to the main water supply pipeline and the main return water pipeline. The air source heat pump unit is connected to the main water supply pipeline and the main return water pipeline through the first output pipeline and the first input pipeline, respectively. The ground source heat pump unit is connected to the main water supply pipeline and the main return water pipeline through the second output pipeline and the second input pipeline, respectively. The first output pipe and the first input pipe are connected by a bypass pipe. The switching module is connected to the first output pipe, the first input pipe and the bypass pipe respectively. The control module can control the switching module according to the information of the detection module, so that the air source heat pump unit can enter the anti-freeze mode through self-circulation in a low temperature environment.

[0007] In one of the alternative technical solutions, the switching module includes a first solenoid valve disposed on the bypass pipe, a second solenoid valve disposed between the first output pipe and the main water supply pipe, and a third solenoid valve disposed between the first input pipe and the main return water pipe, wherein the first solenoid valve, the second solenoid valve and the third solenoid valve are respectively connected to the control module.

[0008] In one of the alternative technical solutions, when the air source heat pump unit is in operation mode, the first solenoid valve is closed, and the second solenoid valve and the third solenoid valve are open; When the air source heat pump unit is in anti-freeze mode, the first solenoid valve is open, the second solenoid valve and the third solenoid valve are closed, and the first input pipe and the first output pipe are connected to allow the water in the air source heat pump unit to circulate.

[0009] In one of the alternative technical solutions, a water replenishment mechanism is also included for replenishing water to the ground source heat pump unit and the air source heat pump unit. The water replenishment mechanism is connected to the first input pipe and the second input pipe respectively through pipes.

[0010] In one of the alternative technical solutions, the air source heat pump unit includes multiple air source heat pumps and an air source side circulation pump installed on the first input pipe, the ground source heat pump unit includes a ground source heat pump and a ground source side circulation pump installed on the second output pipe, and a water circulation pump is provided on the return water main pipe.

[0011] In one of the alternative technical solutions, the monitoring module includes a first temperature sensor for collecting outdoor ambient temperature, a second temperature sensor for collecting the temperature of the first input pipe or the water in the first input pipe, and a flow sensor for collecting the flow rate in the first input pipe or the flow rate in the first input pipe.

[0012] The present invention provides a control method for any of the aforementioned composite air-source heat pump cold and heat source systems, comprising: When the air source heat pump unit is not providing heat, the outdoor ambient temperature T1 and the water temperature T2 of the first output pipe of the air source heat pump unit are obtained in real time through the monitoring module. If the outdoor ambient temperature T1 and the water temperature T2 of the first output pipe meet the conditions for starting the antifreeze mode, the control switching module will enable the air source heat pump unit to enter the antifreeze mode. When the air source heat pump unit is in anti-freeze mode, the control module controls the air source heat pump unit to start and controls the switching module to make the water flow inside the air source heat pump unit self-circulate, maintaining the water temperature of the air source heat pump unit in the first temperature range.

[0013] In one of the optional technical solutions, the antifreeze mode specifically includes: If the outdoor ambient temperature T1 is less than or equal to 5℃ and the water temperature T2 in the first output pipe is less than or equal to 0℃, the control switching module will put the air source heat pump unit into anti-freeze mode. When the air source heat pump unit is in anti-freeze mode, the control switching module connects the bypass pipe, the first input pipe and the second input pipe, and obtains the flow rate Q of the bypass pipe in real time. The control module selects the number of air source heat sources to start and the operating status based on the water temperature T2 of the first output pipe and the flow rate Q of the bypass pipe, and maintains the water temperature T2 of the first output pipe in the range of 3-5℃.

[0014] In one of the optional technical solutions, the control module selects the number of air source heat sources to be started and their operating status based on the water temperature T2 of the first output pipe and the flow rate Q of the bypass pipe, specifically including: If T2≥2℃ and T2≤5℃, then control one of the air source heat pumps to start and output low-temperature hot water in the second temperature range. The low-temperature hot water circulates in the first input pipe and the first output pipe through the bypass pipe to maintain T2 in the first temperature range. If T2 < 2℃, all air source heat pumps in the air source heat pump unit will be started and the air source heat pump unit will output medium-temperature hot water in the third temperature range. The medium-temperature hot water will circulate in the first input pipe and the first output pipe through the bypass pipe. When T2 > 5℃, the system will switch to start one of the air source heat pumps and output low-temperature hot water in the first temperature range. If T1≥5℃ and T2≥10℃, the control module controls the switching module to switch off the antifreeze mode and keeps the air source heat pump unit in a stopped state.

[0015] The present invention provides an electronic device, including a memory, a processor, and an electronic device program on the memory, wherein the processor executes the electronic device program to implement the steps of any of the aforementioned control methods.

[0016] The above technical solution has the following beneficial effects: The composite cold and heat source system provided by this invention sets a bypass pipe between the first input pipe and the first output pipe of the air source heat pump unit, and sets a monitoring module and a switching module so that the control module can control the switching module to switch modes based on the monitoring results of the monitoring module. By switching the connection status of the pipe, the air source heat pump unit enters the anti-freeze mode of medium water self-circulation, thereby achieving precise control of heat loss during start-up and balancing anti-freeze requirements with energy-saving goals. Attached Figure Description

[0017] The disclosure of this invention will become more readily understood by referring to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings: Figure 1 This is a schematic diagram of the overall structure of a composite cold and heat source system provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of an air source heat pump unit according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the control module and the switching module provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of a ground source heat pump unit according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of an external mechanism provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the water replenishment mechanism provided in an embodiment of the present invention; Figure 7 A flowchart illustrating a control method for a composite cold and heat source system according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of a water treatment component provided in an embodiment of the present invention.

[0018] Figure reference numerals: 1. Control module; 2. Air source heat pump unit; 21. Air source heat pump; 22. Air source side circulation pump; 23. First output pipe; 24. First input pipe; 3. Ground source heat pump unit; 31. Ground source heat pump; 32. Ground source side circulation pump; 33. Second output pipeline; 34. Second input pipeline; 35. Second pressure tank constant pressure water supply device; 36. Second full-process water treatment device; 37. Second vacuum degasser; 38. Second softened water tank; 4. External connection mechanism; 41. Load-side manifold; 42. Load-side collector; 5. Main water supply pipeline; 6. Main return water pipeline; 61. Water circulation pump; 62. First vacuum degassing machine; 63. First full-process water treatment system; 7. Monitoring module; 71. First temperature sensor; 72. Second temperature sensor; 73. Flow sensor; 8. Switching module; 81. Bypass pipe; 82. First solenoid valve; 83. Second solenoid valve; 84. Third solenoid valve; 9. Water replenishment mechanism; 91. First fully automatic water softener; 92. First softened water tank; 93. First pressure tank constant pressure water replenishment device. Detailed Implementation

[0019] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that in the following description, the terms "first," "second," etc., are used for descriptive purposes only and are not intended to imply or limit relative importance or installation order. The terms "connection" and "connection" should be interpreted broadly, for example, they can refer to direct pipe connections or indirect fluid connections achieved through fittings such as valves and tees.

[0021] In traditional engineering, common methods for preventing freezing of air source heat pumps include: heating the air source heat pump pipeline with electric heating tape; manually draining the water medium in the system; and raising the water temperature by maintaining the overall low load operation of the system.

[0022] The methods described above are partially energy-intensive, partially dependent on manual operation, and partially disruptive to the overall system operation strategy, making them difficult to apply stably in long-term systems with multiple heat sources operating in tandem. Therefore, it is necessary to provide a freeze-proof operation system at the system architecture level that is specifically designed for the air-source heat pump branch, can automatically switch, and is decoupled from the load side.

[0023] like Figure 1-6 As shown, the present invention provides a composite cold and heat source system, including a control module 1, an air source heat pump unit 2, a ground source heat pump unit 3, an external connection mechanism 4 for connecting to the load side, a circulation loop including a main water supply pipe 5 and a main return water pipe 6, a monitoring module 7 for detecting temperature and flow rate and communicating with the control module 1, and a switching module 8 communicating with the control module 1.

[0024] The water distribution end and water collection end of the external connection mechanism 4 are respectively connected to the main water supply pipeline 5 and the main return water pipeline 6. The air source heat pump unit 2 is connected to the main water supply pipeline 5 and the main return water pipeline 6 through the first output pipeline 23 and the first input pipeline 24, respectively. The ground source heat pump unit 3 is connected to the main water supply pipeline 5 and the main return water pipeline 6 through the second output pipeline 33 and the second input pipeline 34, respectively.

[0025] The first output pipe 23 and the first input pipe 24 are connected by a bypass pipe 81. The switching module 8 is connected to the first output pipe 23, the first input pipe 24 and the bypass pipe 81 respectively. The control module 1 can control the switching module 8 according to the information of the detection module, so that the air source heat pump unit 2 can enter the anti-freeze mode through self-circulation in a low temperature environment.

[0026] The present invention aims to solve the problem in existing composite systems where, during winter shutdown, the water inside and connecting pipes of the outdoor air source heat pump unit 2 freezes due to low temperatures, causing pipes and equipment to burst. Existing solutions are often contradictory: if the air source heat pump 21 is activated for freeze protection, energy is wasted due to the lack of actual heating load; if the high-temperature water (45-55°C) from the operating ground source heat pump 31 is used for heat tracing of the air source side pipes, the large temperature difference leads to more severe heat loss, and the high-temperature water may cause thermal shock to components such as plate heat exchangers inside the air source heat pump 21.

[0027] This invention provides an overall architecture for a combined cold and heat source system. For example... Figure 1 As shown, the composite cold and heat source system mainly provides cooling and heating for building air conditioning, heating, and domestic hot water loads. Control module 1 is typically a programmable logic controller or an industrial computer integrated with a dedicated control program, responsible for receiving signals, performing logical judgments, and outputting control commands.

[0028] The combined heat and cold source system includes a combined heat pump unit, comprising an air source heat pump unit 2 and a ground source heat pump unit 3. Of course, the ground source heat pump unit 3 can be replaced with other heat pump units according to actual needs. This invention primarily improves the anti-freezing performance of the air source heat pump unit 2 in winter. The air source heat pump unit 2 is installed outdoors on a roof or ground. Its efficiency is greatly affected by ambient temperature; in extremely cold weather, its efficiency may decrease or it may shut down. Furthermore, during non-peak winter operation, its water system is exposed to low temperatures. The ground source heat pump unit 3 is typically installed indoors, exchanging heat with the relatively constant temperature underground soil through geothermal pipes. It operates efficiently and stably, and its pipes are not exposed to the risk of freezing.

[0029] like Figure 5 As shown, the external mechanism 4 refers to the pipe network system connecting the heating / cooling terminals inside the building, such as fan coil units, underfloor heating coils, and air conditioning units. The external mechanism 4 is connected to the circulation loop through the load-side manifold 41 and the load-side collector 42. The circulation loop consists of the main water supply pipe 5 and the main return water pipe 6, forming a closed hydraulic loop. The main water supply pipe 5 carries medium water that has been heated or cooled by the heat pump unit. The medium water can be clean water or antifreeze, etc. The medium water in the main water supply pipe 5 flows towards the load side. The water that returns from the load side after a temperature change collects in the main return water pipe 6. Before returning to the heat pump unit, it is treated sequentially by the first vacuum degasser 62 and the first full-process water treatment device 63 installed on the main return water pipe 6, and then returned to the air source heat pump unit 2 or the ground source heat pump unit 3 for further treatment.

[0030] Air source heat pump unit 2 is connected to the main water supply pipeline 5 via the first output pipeline 23 and to the main return water pipeline 6 via the first input pipeline 24. Similarly, ground source heat pump unit 3 is connected to the main pipeline via the second output pipeline 33 and the second input pipeline 34. The two heat pump units can operate in parallel, supplying water to the system individually or jointly as needed.

[0031] Air source heat pump unit 2 includes multiple air source heat pumps 21 connected in parallel, and ground source heat pump unit 3 includes a ground source water collector, a ground source water distributor, and a ground source heat pump 31, such as Figure 9 As shown, a water treatment component is installed between the ground source heat pump 31 and the ground source water collector and the ground source water distributor.

[0032] The key structural improvement of this invention lies in adding a bypass pipe 81 between the first output pipe 23 and the first input pipe 24 of the air source heat pump unit 2. The switching module 8 is actually a valve assembly installed on the relevant pipe and operated by the control module 1. The valve assembly controls the switching of the medium water flow between the two paths: access to the main system and internal self-circulation.

[0033] The switching module 8 automatically controls the operating status based on the monitoring data through the control module 1, without the need for manual operation. The monitoring module 7 is a system that includes a temperature sensor and a flow sensor 73, which converts physical signals into electrical signals and transmits them to the control module 1.

[0034] When monitoring module 7 detects that the ambient temperature is too low and there is a risk of freezing in the air source side pipes, control module 1 analyzes the data and changes the valve opening / closing state through switching module 8. At this time, the first output pipe 23 and the first input pipe 24 are directly connected through bypass pipe 81, while the connection between the first output pipe 23 and the first input pipe 24 and the main drain pipe and the main return pipe 6 is cut off. After the air source heat pump unit 2 starts, the internal circulating water pump drives the water flow to circulate only within the air source heat pump unit 2, forming a self-circulating loop to prevent pipes from freezing or breaking. The heat generated by the air source heat pump unit 2 during operation is only used to keep its own water circuit from freezing, and will not be transferred to the circulating loop to avoid waste, thereby achieving a highly efficient and low-energy-consumption anti-freeze mode for the air source heat pump unit 2.

[0035] In summary, the composite heat and cold source system provided in this embodiment of the invention sets up a bypass pipe 81 between the first input pipe 24 and the first output pipe 23 of the air source heat pump unit 2, and sets up a monitoring module 7 and a switching module 8, so that the control module 1 can control the switching module 8 to switch modes based on the monitoring results of the monitoring module 7. By switching the connection status of the pipe, the air source heat pump unit 2 enters the anti-freeze mode of medium water self-circulation, thereby achieving precise control of heat loss during start-up control and balancing anti-freeze requirements with energy-saving goals.

[0036] In one embodiment, such as Figure 3 As shown, the switching module 8 includes a first solenoid valve 82 disposed on the bypass pipe 81, a second solenoid valve 83 disposed between the first output pipe 23 and the main water supply pipe 5, and a third solenoid valve 84 disposed between the first input pipe 24 and the main return water pipe 6. The first solenoid valve 82, the second solenoid valve 83 and the third solenoid valve 84 are respectively connected to the control module 1.

[0037] In this embodiment, a solenoid valve is used because it can be directly controlled by the control module 1, has a fast response speed, is easy to control, and can be directly driven by the switching signal output by the control module 1.

[0038] The first solenoid valve 82 is installed on the bypass pipe 81. When the first solenoid valve 82 is closed, the bypass pipe 81 is disconnected; when the first solenoid valve 82 is open, the bypass pipe 81 is connected, allowing water to circulate directly between the first output pipe 23 and the first input pipe 24.

[0039] The second solenoid valve 83 is installed on the first output pipe 23, located before the tee or valve connecting the outlet of the air source heat pump unit 2 to the main water supply pipe 5. When the second solenoid valve 83 is open, cold or hot water from the air source heat pump 21 can be injected into the main water supply pipe of the system; when the second solenoid valve 83 is closed, this passage is cut off.

[0040] The third solenoid valve 84 is installed on the first input pipe 24, located after the tee or valve connecting to the main return water pipe 6 and before the inlet of the air source heat pump unit 2. When the third solenoid valve 84 is open, the return water from the external mechanism 4 can enter the air source heat pump unit 2; when the third solenoid valve 84 is closed, this passage is cut off.

[0041] In one embodiment, when the air source heat pump unit 2 is in operation mode, the first solenoid valve 82 is closed, and the second solenoid valve 83 and the third solenoid valve 84 are open. When the air source heat pump unit 2 is in anti-freeze mode, the first solenoid valve 82 is opened, the second solenoid valve 83 and the third solenoid valve 84 are closed, and the first input pipe 24 and the first output pipe 23 are connected to enable the water flow in the air source heat pump unit 2 to circulate.

[0042] In this embodiment, during operation, when the building has heating / cooling needs and the control strategy determines to activate the air source heat pump 21, such as operating alone during transitional seasons or in conjunction with the ground source heat pump 31 in winter, the air source heat pump unit 2 enters this operation mode. At this time, the first solenoid valve 82 closes, blocking the bypass pipe 81. The second solenoid valve 83 and the third solenoid valve 84 open, connecting the first input pipe 23 and the first output pipe 24 of the air source heat pump unit 2 to the circulation loop, and the air source heat pump unit 2 operates normally to meet the load-side demand.

[0043] In anti-freeze mode, when anti-freeze activation conditions are detected, the air source heat pump unit 2 is switched to this anti-freeze mode via switching module 8. At this time, the first solenoid valve 82 opens, opening the bypass pipe 81. The second solenoid valve 83 and the third solenoid valve 84 close simultaneously, completely isolating the water circuit of the air source heat pump unit 2 from the main pipeline. When the air source heat pump unit 2 is running, the water pumped by the pump can only flow from the outlet through the first output pipe 23, the opened bypass pipe 81, and the first input pipe 24 back to the inlet of the air source heat pump unit 2, forming a closed self-circulation. The heat generated by the unit consuming electrical energy is used to heat the water in the loop, maintaining its temperature above the freezing point, thereby preventing freezing.

[0044] In one embodiment, a water replenishment mechanism 9 is also included for replenishing water to the ground source heat pump unit 3 and the air source heat pump unit 2. The water replenishment mechanism 9 is connected to the first input pipe 24 and the second input pipe 34 through pipes, respectively.

[0045] This embodiment employs a constant pressure water replenishment scheme. The circulating water system loses some water due to leaks, venting, etc., requiring periodic replenishment to maintain system pressure; therefore, a water replenishment mechanism 9 is necessary. The output pipe of the water replenishment mechanism 9 is connected to the first input pipe 24 and the second input pipe 34, respectively. The water replenishment mechanism 9 can directly replenish water to the air source heat pump unit 2 and the ground source heat pump unit 3 without affecting the pressure balance of the circulation loop. Preferably, the water replenishment mechanism 9 includes a first fully automatic water softener, a first softened water tank, and a first pressure tank constant pressure water replenishment device connected sequentially from the inlet to the outlet.

[0046] In one embodiment, the air source heat pump unit 2 includes a plurality of air source heat pumps 21 and an air source side circulation pump 22 installed on the first input pipe 24, the ground source heat pump unit 3 includes a ground source heat pump 31 and a ground source side circulation pump 32 installed on the second output pipe 33, and a water circulation pump 61 is provided on the return water main pipe 6.

[0047] In this embodiment, the air source heat pump unit 2 includes multiple air source heat pump 21 units connected in parallel, and the ground source heat pump unit 3 also includes a ground source side water collector, a ground source side water distributor, and two ground source heat pump 31 units connected in parallel. A second pressure tank constant pressure water supply device 35, a second full-process water treatment instrument 36, and a second vacuum degasser 37 are provided between the ground source side water collector and the ground source side circulating pump 32. The second pressure tank constant pressure water supply device 35 is connected to the second softened water tank 38.

[0048] Preferably, the air source side circulation pump 22, the ground source side circulation pump 32, and the water circulation pump 61 are all three pumps connected in parallel.

[0049] In one embodiment, such as Figure 3As shown, the monitoring module 7 includes a first temperature sensor 71 for collecting outdoor ambient temperature, a second temperature sensor 72 for collecting the temperature of the water in the first input pipe 24 or the first input pipe 24, and a flow sensor 73 for collecting the flow rate in the first input pipe 24 or the first input pipe 24.

[0050] In this embodiment, the first temperature sensor 71 is installed outdoors in a well-ventilated location, free from direct sunlight and heat sources, to collect the outdoor ambient temperature T1 in real time. The second temperature sensor 72 is installed on the first input pipe 24 to collect the water temperature T2 in the air source side pipe in real time. The flow sensor 73 is installed on the first input pipe 24 or the bypass pipe 81 to collect the water flow rate Q.

[0051] The first temperature sensor 71, the second temperature sensor 72, and the flow sensor 73 all collect data in real time and transmit it to the control module 1.

[0052] Other structures not listed in this invention are described in the prior art.

[0053] like Figure 7 The figure shown is a control method for a composite air-source heat pump cold and heat source system applied to any of the foregoing embodiments, provided by an embodiment of the present invention, comprising the following steps: Step S701: When the air source heat pump unit 2 is not supplying heat, the outdoor ambient temperature T1 and the water temperature T2 of the first output pipe 23 of the air source heat pump unit 2 are obtained in real time through the monitoring module 7. Step S702: If the outdoor ambient temperature T1 and the water temperature T2 of the first output pipe 23 meet the anti-freeze mode start-up conditions, the control switching module 8 will enable the air source heat pump unit 2 to enter the anti-freeze mode. Step S703: When the air source heat pump unit 2 is in anti-freeze mode, the control module 1 controls the air source heat pump unit 2 to start and controls the switching module 8 to make the water flow inside the air source heat pump unit 2 self-circulate, so as to maintain the water temperature of the air source heat pump unit 2 in the first temperature range.

[0054] In one embodiment, the antifreeze mode specifically includes: If the outdoor ambient temperature T1 is less than or equal to 5℃ and the water temperature T2 of the first output pipe 23 is less than or equal to 0℃, the control switching module 8 will cause the air source heat pump unit 2 to enter the anti-freeze mode. When the air source heat pump unit 2 is in anti-freeze mode, the control switching module 8 connects the bypass pipe 81 and the first input pipe 24 and the second input pipe 34, and obtains the flow rate Q of the bypass pipe 81 in real time. The control module 1 selects the number of air source heat sources to start and the operating status according to the water temperature T2 of the first output pipe 23 and the flow rate Q of the bypass pipe 81, and maintains the water temperature T2 of the first output pipe 23 in the range of 3-5℃.

[0055] In one embodiment, the control module 1 selects the number of air source heat sources to be started and their operating status based on the water temperature T2 of the first output pipe 23 and the flow rate Q of the bypass pipe 81, specifically including: If T2≥2℃ and T2≤5℃, then one of the air source heat pumps 21 is controlled to start and output low-temperature hot water in the second temperature range. The low-temperature hot water circulates in the first input pipe 24 and the first output pipe 23 through the bypass pipe to maintain T2 in the first temperature range. If T2 < 2℃, all air source heat pumps 21 in the air source heat pump unit 2 are started and the air source heat pump unit 2 outputs medium-temperature hot water in the third temperature range. The medium-temperature hot water circulates in the first input pipe 24 and the first output pipe 23 through the bypass pipe. When T2 > 5℃, the system switches to start one of the air source heat pumps 21 and outputs low-temperature hot water in the first temperature range. If T1≥5℃ and T2≥10℃, control module 1 controls switching module 8 to switch off the antifreeze mode and controls air source heat pump unit 2 to remain in a stopped state.

[0056] The first temperature range is preferably 3-5℃, the second temperature range is preferably 15-20℃, and the third temperature range is preferably 25-30℃.

[0057] When 2℃≤T2≤5℃, it is considered to be under mild antifreeze conditions, and the water temperature is near the lower limit of the safe range. Control module 1 starts an air source heat pump 21, which can be started alternately to balance wear and control its operation in a low-load state, so that it outputs warm water in the first temperature range.

[0058] When T2 < 2℃, it is considered an emergency anti-freeze situation, as the water temperature is close to freezing point, posing a high risk. Control module 1 immediately starts all air source heat pumps 21, possibly operating at higher power to output hot water at a higher temperature in the second temperature range. Once T2 rises above 5℃, control module 1 adjusts the unit's operating parameters, switching the supply water temperature back to the aforementioned first temperature range and entering a low-power maintenance mode.

[0059] Dynamic adjustments can be made. When T2 approaches 5℃, the unit power or water pump speed is reduced; when T2 approaches 3℃, the power or speed is appropriately increased.

[0060] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0061] like Figure 8 The diagram shows a hardware structure of an electronic device according to the present invention, including a memory 802, a processor 801, and an electronic device program on the memory 802. The processor 801 executes the electronic device program to implement the steps of the control method of any of the above embodiments.

[0062] Figure 8 Take the 801 processor as an example.

[0063] The electronic device may also include an input device 803 and a display device 804.

[0064] The processor 801, memory 802, input device 803 and display device 804 can be connected by a bus or other means. The figure shows an example of connection by bus.

[0065] The memory 802, as a non-volatile electronic device readable storage medium, can be used to store non-volatile software programs, non-volatile electronic device executable programs, and modules, such as the program instructions / modules corresponding to the control method in the embodiments of this application. The processor 801 executes various functional applications and data processing by running the non-volatile software programs, instructions, and modules stored in the memory 802, thereby implementing the control method in the above embodiments.

[0066] The memory 802 may include a program storage area and a data storage area. The program storage area may store the operating system and application programs required for at least one function; the data storage area may store data created based on the use of the control method. Furthermore, the memory 802 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 802 may optionally include memory remotely located relative to the processor 801, and these remote memories may be connected to the apparatus performing the control method via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0067] The input device 803 can receive user clicks and generate signal inputs related to user settings and function control of the control method. The display device 804 may include a display screen or other display device.

[0068] The one or more modules are stored in the memory 802, and when run by the one or more processors 801, they execute the control method in any of the above method embodiments.

[0069] When the electronic device disclosed in this invention is running, it can execute all the steps of the above-described control method. By setting a bypass pipe between the first input pipe and the first output pipe of the air source heat pump unit, and by setting a monitoring module and a switching module, the control module can control the switching module to switch modes based on the monitoring results of the monitoring module. By switching the connection status of the pipe, the air source heat pump unit can enter the anti-freeze mode of medium water self-circulation.

[0070] An embodiment of the present invention provides an electronic device readable storage medium storing an electronic device program / instructions, which, when executed by a processor 801, implements all the steps of the control method described above.

[0071] In the context of this disclosure, a storage medium can be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, apparatus, or device. The storage medium can be a machine-readable signal medium or a machine-readable storage medium. Optionally, the storage medium can be a non-transitory electronically readable storage medium, such as a ROM, random access memory (RAM), compact disc ROM (CD ROM), magnetic tape, floppy disk, and optical data storage device.

[0072] One embodiment of the present invention provides an electronic device program product, including an electronic device program / instruction, which, when executed by a processor, implements the steps of the control method as described above.

[0073] By running the aforementioned electronic device program, all steps of the control method described above can be executed. By setting a bypass pipe between the first input pipe and the first output pipe of the air source heat pump unit, and by setting a monitoring module and a switching module, the control module can control the switching module to switch modes based on the monitoring results of the monitoring module. By switching the connection status of the pipe, the air source heat pump unit can enter the anti-freeze mode of medium water self-circulation.

[0074] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A combined cold and heat source system, characterized by, The control module, the air source heat pump unit, the ground source heat pump unit, the external connection mechanism for connecting the load side, the circulating loop including the water supply main pipeline and the water return main pipeline, the monitoring module for detecting temperature and flow rate and being in communication connection with the control module, and the switching module in communication connection with the control module; The water distribution end and the water collection end of the external connection mechanism are connected with the water supply main pipeline and the water return main pipeline respectively, the air source heat pump unit is connected with the water supply main pipeline and the water return main pipeline through the first output pipeline and the first input pipeline respectively, and the ground source heat pump unit is connected with the water supply main pipeline and the water return main pipeline through the second output pipeline and the second input pipeline respectively; The first output pipeline and the first input pipeline are connected through the bypass pipeline, the switching module is connected with the first output pipeline, the first input pipeline and the bypass pipeline respectively, and the control module can control the switching module according to the information of the monitoring module, so that the air source heat pump unit enters the anti-freezing mode through self-circulation in a low-temperature environment.

2. The combined cold and heat source system according to claim 1, wherein The switching module includes a first electromagnetic valve arranged on the bypass pipeline, a second electromagnetic valve arranged between the first output pipeline and the water supply main pipeline, and a third electromagnetic valve arranged between the first input pipeline and the water return main pipeline, and the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are connected with the control module respectively.

3. The combined cold heat source system according to claim 2, wherein When the air source heat pump unit is in the running mode, the first electromagnetic valve is closed, and the second electromagnetic valve and the third electromagnetic valve are opened; When the air source heat pump unit is in the anti-freezing mode, the first electromagnetic valve is opened, the second electromagnetic valve and the third electromagnetic valve are closed, and the first input pipeline and the first output pipeline are communicated to make the water in the air source heat pump unit self-circulate.

4. The combined cold heat source system according to claim 1, wherein The water supplement mechanism for supplementing water for the ground source heat pump unit and the air source heat pump unit is further included, and the water supplement mechanism is connected with the first input pipeline and the second input pipeline through pipelines respectively.

5. The combined cold heat source system according to claim 4, wherein The air source heat pump unit includes a plurality of air source heat pumps and an air source side circulating pump arranged on the first input pipeline, the ground source heat pump unit includes a ground source heat pump and a ground source side circulating pump arranged on the second output pipeline, and a water circulating pump is arranged on the water return main pipeline.

6. The combined cold heat source system of claim 1, wherein The monitoring module includes a first temperature sensor for collecting outdoor environment temperature, a second temperature sensor for collecting water temperature in the first input pipeline or the first input pipeline, and a flow rate sensor for collecting flow rate in the first input pipeline or the first input pipeline.

7. A control method applied to the hybrid air source heat pump cold and heat source system according to any one of claims 1-6, characterized in that, The control method comprises the following steps: When the air source heat pump unit does not supply heat, the outdoor environment temperature T1 and the water temperature T2 of the first output pipeline of the air source heat pump unit are acquired in real time through the monitoring module; If the outdoor environment temperature T1 and the water temperature T2 of the first output pipeline meet the anti-freezing mode starting condition, the air source heat pump unit is controlled to enter the anti-freezing mode through the switching module; In the anti-freezing mode of the air source heat pump unit, the control module controls the air source heat pump unit to start and controls the switching module to make the water flow in the air source heat pump unit self-circulate, so as to maintain the water temperature of the air source heat pump unit in the first temperature range.

8. The control method according to claim 7, characterized by The anti-freezing mode specifically includes: If the outdoor environment temperature T1 is less than or equal to 5℃, and the water temperature T2 of the first output pipeline is less than or equal to 0℃, the switching module is controlled to make the air source heat pump unit enter the anti-freezing mode In the anti-freezing mode of the air source heat pump unit, the switching module is controlled to make the bypass pipeline communicate, so that the first input pipeline and the second input pipeline communicate, the flow rate Q of the bypass pipeline is obtained in real time, and the control module selects the start number and the running state of the air source heat source according to the water temperature T2 of the first output pipeline and the flow rate Q of the bypass pipeline, so as to maintain the water temperature T2 of the first output pipeline in the range of 3-5℃.

9. The control method according to claim 8, characterized by, The control module selects the start number and the running state of the air source heat source according to the water temperature T2 of the first output pipeline and the flow rate Q of the bypass pipeline, and specifically includes: If T2≥2℃ and T2≤5℃, one of the air source heat pumps is controlled to start and output low-temperature hot water in the second temperature range, and the low-temperature hot water circulates in the first input pipeline and the first output pipeline through the bypass pipeline to maintain T2 in the first temperature range; If T2<2℃, all the air source heat pumps in the air source heat pump unit are controlled to start, and the air source heat pump unit outputs medium-temperature hot water in the third temperature range, and the medium-temperature hot water circulates in the first input pipeline and the first output pipeline through the bypass pipeline; when T2>5℃, the air source heat pump is controlled to start and output low-temperature hot water in the first temperature range; If T1≥5℃ and T2≥10℃, the control module controls the switching module to switch to close the anti-freezing mode, and controls the air source heat pump unit to keep the stop state.

10. An electronic device comprising a memory, a processor, and an electronic device program on the memory, wherein the electronic device program comprises instructions that, when executed by the processor, cause the electronic device to perform the method of any one of claims 1-9. The processor executes the electronic device program to realize the steps of the control method in any one of claims 7-9. The processor executes the electronic device program to realize the steps of the control method in any one of claims 7-9.

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