Composite energy coupling system and control method thereof

Abstract

The present application relates to heat pump unit technical field, provide a kind of composite energy coupling system and control method thereof, composite energy coupling system includes water collector, load side water pump, water distributor and water source heat pump and air source heat pump, water source heat pump and air source heat pump are arranged between water collector and water distributor, load side water pump, water source heat pump, air source heat pump and water distributor are connected by pipeline, valve is arranged on the pipeline at different positions, and the on-off state of part of multiple valves is switched according to operating mode to make at least one of water source heat pump and air source heat pump work.Composite energy coupling system can control the flow path of cooling water when operating, and then select the heat pump with the highest energy efficiency to provide service, reduce the overall energy consumption of the system, and a set of composite energy coupling system can meet the use demand of user, reduce initial investment cost, and be conducive to the popularization and use of composite energy coupling system.

Description

Technical Field

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

[0002] Currently, winter heating in northern China relies on centralized systems such as coal-fired boilers, gas-fired boilers, and combined heat and power (CHP). These methods generate significant emissions, pollute the environment, and incur high heating costs. To achieve energy conservation and emission reduction, renewable energy sources are increasingly being used for winter heating in northern China, such as water-source, ground-source, air-source, and waste heat recovery systems, with distributed heating being particularly prominent. However, in some related technologies, such as those using a single air-source heater, the unit's energy efficiency and heating capacity decrease significantly in low outdoor temperatures, while still consuming a large amount of electricity. This necessitates the installation of more units, increasing investment costs and making widespread adoption more difficult. Summary of the Invention

[0003] This invention aims to solve at least one of the technical problems existing in related technologies. To this end, this invention proposes a composite energy coupling system that can couple multiple energy sources and switch to a more energy-efficient operating mode, thereby solving the problem of high power consumption from a single energy source.

[0004] The present invention also provides a control method for a composite energy coupling system.

[0005] According to a first aspect embodiment of the present invention, a composite energy coupling system includes:

[0006] A water collector is used to collect cooling water return water from the load side;

[0007] A load-side water pump, connected to the outlet end of the water collector, is used to adjust the pressure and flow rate of the cooling water return flowing downstream;

[0008] A water distributor is used to distribute cooling water outlet to the load side; and

[0009] A water source heat pump and an air source heat pump are installed between the water collector and the water distributor. The load-side water pump, the water source heat pump, the air source heat pump, and the water distributor are connected by pipelines. Valves are installed on the pipelines at different locations. According to the operating mode, the on / off state of some of the valves is switched to make at least one of the water source heat pump and the air source heat pump work. The cooling return water exchanges heat with the working heat pump along the pipeline to form the cooling water outlet.

[0010] According to one embodiment of the present invention, the water source heat pump includes a water source heat pump unit, a cooling tower, and a heat source side water pump, wherein the water source heat pump unit includes a first heat exchange side and a second heat exchange side.

[0011] A first valve is provided between the inlet of the first heat exchange side and the load-side water pump; a second valve is provided between the outlet of the first heat exchange side and the water distributor; a third valve is provided between the outlet of the second heat exchange side and the cooling tower; a fourth valve is provided between the cooling tower and the heat source-side water pump; and a fifth valve is provided between the heat source-side water pump and the inlet of the second heat exchange side.

[0012] A sixth valve is provided between the load-side water pump and the inlet of the second heat exchange side; a seventh valve is provided between the outlet of the second heat exchange side and the water distributor; an eighth valve is provided between the outlet of the first heat exchange side and the air source heat pump; a ninth valve is provided between the heat source-side water pump and the air source heat pump; and a tenth valve is provided between the inlet of the first heat exchange side and the heat source-side water pump.

[0013] An eleventh valve and a thirteenth valve are provided between the load-side water pump and the air source heat pump, and a fourteenth valve and a twelfth valve are provided between the air source heat pump and the water distributor.

[0014] According to one embodiment of the present invention, the water source heat pump includes a plurality of water source heat pump units connected in parallel;

[0015] And / or, both the load-side water pump and the heat source-side water pump include multiple water pumps connected in parallel;

[0016] And / or, the number of cooling towers is multiple.

[0017] A control method for a composite energy coupling system according to a second aspect embodiment of the present invention includes:

[0018] To obtain the operating mode of the composite energy coupling system;

[0019] If the operating mode is determined to be water source heat pump cooling mode, then the first valve, the second valve, the third valve, the fourth valve, and the fifth valve are simultaneously turned on, and all other valves are turned off.

[0020] If the operating mode is determined to be an air-source-water-source combined refrigeration mode, then the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the eleventh valve, the twelfth valve, the thirteenth valve, and the fourteenth valve are simultaneously turned on, and all other valves are turned off.

[0021] If the operating mode is determined to be an air-source-water source combined heating mode, then the sixth valve, the seventh valve, the eighth valve, the ninth valve, and the tenth valve are simultaneously turned on, while all other valves are turned off.

[0022] If the operating mode is determined to be air source heat pump heating mode, then the eleventh valve, the twelfth valve, the thirteenth valve, and the fourteenth valve are simultaneously turned on, and all other valves are turned off.

[0023] According to one embodiment of the present invention, the step of obtaining the operating mode of the composite energy coupling system further includes:

[0024] If the operating mode is determined to be the heating mode, then the first total power of the air source heat pump heating mode and the second total power of the air source-water source combined heating mode are obtained when the heating capacity is the same on the same load side.

[0025] The heating mode is switched to either the air source heat pump heating mode or the air source-water source combined heating mode based on the first total power and the second total power.

[0026] According to an embodiment of the present invention, the step of switching the heating mode to the air source heat pump heating mode or the air source-water source combined heating mode based on the first total power and the second total power specifically includes:

[0027] If the first total power is determined to be greater than the second total power, then the air-source-water combined heating mode is activated;

[0028] If it is determined that the first total power is less than the second total power, then the air source heat pump heating mode is activated;

[0029] If the first total power is determined to be equal to the second total power, then the current heating mode is maintained.

[0030] According to one embodiment of the present invention, the step of operating the air-source-water combined heating mode or the step of operating the air-source heat pump heating mode further includes, before:

[0031] Obtain the current heating mode;

[0032] If it is determined that the current heating mode is the same as the heating mode to be operated, then the current heating mode is maintained.

[0033] If it is determined that the current heating mode is different from the heating mode to be operated, the first total power and the second total power are continuously monitored, and after the duration of the mode switching condition is longer than the first preset duration, the mode is switched to the heating mode to be operated.

[0034] According to one embodiment of the present invention, the step of obtaining the operating mode of the composite energy coupling system further includes:

[0035] If the operating mode is determined to be cooling mode, then the following parameters are obtained: cooling water return temperature, cooling water outlet temperature, number of water pumps on the load side, number of water pumps on the heat source, single unit power of the water source heat pump unit, unit load rate, and heating capacity per unit power.

[0036] The number of water source heat pump units is determined based on the cooling water return temperature, the cooling water outlet temperature, the number of water pumps on the load side, the number of water pumps on the heat source measuring pump, the power of a single unit, the unit load rate, and the heating capacity per unit power.

[0037] According to one embodiment of the present invention, the step of obtaining the operating mode of the composite energy coupling system further includes:

[0038] The system obtains the heat dissipation of the cooling tower, the minimum water flow rate of a single cooling tower, the outdoor wet-bulb temperature, the set operating approximation degree, the maximum heat dissipation capacity of a single cooling tower, and the total number of cooling towers.

[0039] The number of operating cooling towers is determined based on the cooling tower's heat dissipation, the minimum water flow rate, the outdoor wet-bulb temperature, the set operating approximation degree, the maximum heat dissipation capacity, and the total number of cooling towers.

[0040] The operating frequency of each cooling tower is determined based on the number of operating towers.

[0041] According to one embodiment of the present invention, the composite energy coupling system further includes a plurality of humidity sensors, which are respectively disposed in a plurality of rooms. The step of obtaining the operating mode of the composite energy coupling system then further includes:

[0042] Record the timing of the cooling water outlet temperature adjustment, and detect the relative humidity in each room at second preset intervals;

[0043] If the relative humidity in any room is greater than the first set relative humidity, and the time since the last temperature adjustment of the cooling water outlet is greater than the third preset time, and the cooling water outlet temperature is greater than or equal to the preset temperature, then the set temperature of the cooling water outlet is reduced by the first temperature value.

[0044] If the relative humidity in all rooms is less than or equal to the second set relative humidity, and the time since the last temperature adjustment of the cooling water outlet is greater than the fourth preset time, then the set temperature of the cooling water outlet is increased by the second temperature value.

[0045] If the relative humidity in all rooms is determined to be greater than the second set relative humidity and less than or equal to the first set relative humidity, then the set temperature of the cooling water outlet is maintained unchanged.

[0046] The above-described one or more technical solutions of this invention have at least one of the following technical effects:

[0047] According to a first aspect of the present invention, a composite energy coupling system includes a water collector, a load-side water pump, a water distributor, a water source heat pump, and an air source heat pump. The water collector collects cooling water return from the load side; the load-side water pump is connected to the outlet of the water collector; the water distributor distributes cooling water to the load side; the water source heat pump and the air source heat pump are disposed between the water collector and the water distributor; the load-side water pump, the water source heat pump, the air source heat pump, and the water distributor are connected by pipelines; valves are installed on the pipelines at different locations; the on / off state of some of the multiple valves is switched according to the operating mode to make at least one of the water source heat pump and the air source heat pump work. When the composite energy coupling system is running, the flow path and flow direction of the cooling water can be controlled by controlling the on / off state of the valves on the multiple pipelines, thereby making at least one of the water source heat pump and the air source heat pump work. When operating in heating or cooling mode, the heat source or cold source of the composite energy coupling system can be adjusted to select the most energy-efficient heat pump to provide services, thereby reducing the overall energy consumption of the system and improving the heat exchange efficiency of the system. Moreover, a single composite energy coupling system can meet the user's needs, reducing the initial investment cost and facilitating the promotion and use of composite energy coupling systems. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the 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.

[0049] Figure 1 A schematic structural diagram of a composite energy coupling system provided in an embodiment of the present invention;

[0050] Figure 2 This is one of the flowcharts for the control method of the composite energy coupling system provided in the embodiments of the present invention;

[0051] Figure 3 The second flowchart illustrates the control method for a composite energy coupling system provided in this embodiment of the invention.

[0052] Figure label:

[0053] 1. First valve; 2. Second valve; 3. Third valve; 4. Fourth valve; 5. Fifth valve; 6. Sixth valve; 7. Seventh valve; 8. Eighth valve; 9. Ninth valve; 10. Tenth valve; 11. Eleventh valve; 12. Twelfth valve; 13. Thirteenth valve; 14. Fourteenth valve; 15. Load-side water pump; 16. Heat source-side water pump; 17. Inlet of the first heat exchange side; 18. Outlet of the first heat exchange side; 19. Inlet of the second heat exchange side; 20. Outlet of the second heat exchange side. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the invention clearer, the technical solutions of the invention will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0055] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0056] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0057] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0058] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0059] In related technologies, for example, when using a single air source, if the outdoor ambient temperature is low, the unit's energy efficiency and heating capacity will be severely reduced, and the power consumption will be large, requiring more units to be configured, increasing investment costs and making it more difficult to promote and use.

[0060] The composite energy coupling system provided according to the first aspect embodiment of the present invention is described in detail below. Figure 1 It includes a water collector, a water distributor, a load-side water pump 15, a water source heat pump, and an air source heat pump. The water source heat pump and the air source heat pump have a complete refrigerant circulation loop. The water source heat pump can exchange heat between groundwater or river / lake water and the cooling water in the composite energy coupling system, while the air source heat pump can exchange heat between air and the cooling water in the composite energy coupling system.

[0061] A water collector is installed at the return water inlet of the composite energy coupling system to collect cooling water return from the load side. The water collector can have multiple inlets, thus collecting cooling water return from multiple load sides, such as the server room of a data center or an indoor location in a living area. A load-side water pump 15 is installed at the outlet of the water collector. This pump adjusts the pressure and flow rate of the cooling water return from the load side before inputting it into the composite energy coupling system. The flow path and direction of the pressurized cooling water return are constrained by pipes and valves.

[0062] The water distributor is installed at the outlet of the composite energy coupling system to distribute cooling water to the load side. There can be multiple load sides, and the water distributor and valves can be used to determine whether to supply water to some or all of the multiple load sides.

[0063] A water source heat pump and an air source heat pump are installed between the water collector and the water distributor. The number of water source heat pumps and air source heat pumps can be one or more. The load-side water pump 15, the air source heat pump, the water source heat pump, and the water distributor are connected by multiple pipelines. These pipelines allow the air source heat pump and the water source heat pump to form a series or parallel connection. Valves are installed on the pipelines at different locations. Switching the on / off state of some of these valves adjusts the flow path and direction of the cooling water in the hybrid energy coupling system, allowing at least one of the water source heat pumps and the air source heat pump to operate. The cooling water return flows along the pipeline, exchanges heat with the operating heat pump, and then forms the cooling water outlet. When the water source heat pump and the air source heat pump operate synchronously or asynchronously, it corresponds to the preset operating mode of the hybrid energy coupling system. Therefore, the on / off state of some of the valves can be determined according to the instructions or requirements of the operating mode.

[0064] The hybrid energy coupling system provided in this invention, during operation, controls the flow path and direction of cooling water by controlling the opening and closing of valves on multiple pipelines, thereby enabling at least one of the water source heat pump and air source heat pump to operate. When operating in heating or cooling mode, the heat source or cold source of the hybrid energy coupling system can be adjusted to select the most energy-efficient heat pump to provide service to the user, reducing the overall energy consumption of the system, improving the heat exchange efficiency, and allowing a single hybrid energy coupling system to meet user needs, thus reducing initial investment costs and facilitating the widespread adoption of hybrid energy coupling systems.

[0065] In some embodiments, a water source heat pump includes a water source heat pump unit, a cooling tower, and a heat source-side water pump 16. The number of water source heat pump units can be multiple, and the number of operating units is related to the total heat exchange demand. The optimal number of operating units can be determined based on various operating environments. Each water source heat pump unit includes a first heat exchange side and a second heat exchange side. The first heat exchange side may be an evaporation side or a condensation side, and the second heat exchange side may be a condensation side or an evaporation side.

[0066] Please see Figure 1 A first valve 1 is provided between the inlet 17 of the first heat exchange side and the load-side water pump 15; a second valve 2 is provided between the outlet 18 of the first heat exchange side and the water distributor; a third valve 3 is provided between the outlet 20 of the second heat exchange side and the cooling tower; a fourth valve 4 is provided between the cooling tower and the heat source-side water pump 16; and a fifth valve 5 is provided between the heat source-side water pump 16 and the inlet 19 of the second heat exchange side.

[0067] A sixth valve 6 is provided between the load-side water pump 15 and the inlet 19 of the second heat exchange side; a seventh valve 7 is provided between the outlet 20 of the second heat exchange side and the water distributor; an eighth valve 8 is provided between the outlet 18 of the first heat exchange side and the air source heat pump; a ninth valve 9 is provided between the heat source-side water pump 16 and the air source heat pump; and a tenth valve 10 is provided between the inlet 17 of the first heat exchange side and the heat source-side water pump 16.

[0068] An eleventh valve 11 and a thirteenth valve 13 are installed between the load-side water pump 15 and the air source heat pump, and a fourteenth valve 14 and a twelfth valve 12 are installed between the air source heat pump and the water distributor. The eleventh valve 11 and the thirteenth valve 13 are located at opposite ends of the same pipeline, and the twelfth valve 12 and the fourteenth valve 14 are located at opposite ends of the same pipeline. The eleventh valve 11 and the twelfth valve 12 are located inside the machine room, while the thirteenth valve 13 and the fourteenth valve 14 are located outside the machine room.

[0069] In the first scenario, valves 1, 2, 3, 4, and 5 are simultaneously turned on, while all other valves are closed. In this case, the water source heat pump cooling mode can be operated.

[0070] Please see Figure 1 The cooling water outlet from the load side (e.g., 12°C) flows into the first heat exchange side of the water source heat pump unit via the water collector, load-side water pump 15, and first valve 1. After the water source heat pump unit cools the return water, the outlet water (e.g., 7°C) enters the water distributor via the second valve 2 and is supplied to the load side. The high-temperature cooling water outlet from the second heat exchange side of the water source heat pump unit (e.g., 35°C) enters the cooling tower via the third valve 3. After sufficient heat dissipation, the low-temperature cooling water return water (e.g., 30°C) is returned to the second heat exchange side of the water source heat pump unit via the fourth valve 4, heat source-side water pump 16, and fifth valve 5. At this time, the water source heat pump unit operates in cooling mode, and the air source heat pump is shut down.

[0071] In the second scenario, valves 1, 2, 3, 4, 5, 11, 12, 13, and 14 are simultaneously opened, while all other valves are closed. In this case, the air-water combined cooling mode can be operated.

[0072] Please see Figure 1The cooling water outlet from the load side (e.g., 12°C) passes through the water collector and the load side water pump 15. Part of the cooling water outlet from the load side flows into the first heat exchange side (evaporation side) of the water source heat pump unit through the first valve 1. After the water source heat pump unit cools the cooling water return water, the outlet water (e.g., 7°C) enters the water distributor through the second valve 2 and is supplied to the load side. The other part flows into the air source heat pump through the eleventh valve 11 and the thirteenth valve 13. After the air source heat pump cools the return water, the outlet water (e.g., 7°C) mixes with the cooling water return water of the water source heat pump unit through the fourteenth valve 14 and the twelfth valve 12, and then enters the water distributor and is supplied to the load side. The high-temperature cooling water outlet water (e.g., 35°C) from the second heat exchange side of the water source heat pump unit enters the cooling tower through the third valve 3. After sufficient heat dissipation, the low-temperature cooling water return water (e.g., 30°C) is sent back to the second heat exchange side of the water source heat pump unit through the fourth valve 4, the heat source side water pump 16, and the fifth valve 5. At this time, the water source heat pump unit is operating in cooling mode, and the air source heat pump is operating in cooling mode.

[0073] In the third case, valves 6, 7, 8, 9, and 10 are simultaneously turned on, while all other valves are closed. In this case, the air-source-water-source combined heating mode is activated.

[0074] Please see Figure 1 Hot water return from the load side (e.g., 50°C) flows into the second heat exchange side (condenser side) of the water source heat pump unit via the water collector, load-side water pump 15, and sixth valve 6. After the water source heat pump unit heats the return water, the outlet water (e.g., 55°C) enters the distributor and load side through the seventh valve 7. When the air source heat pump operates in heating mode, the high-temperature heat source water (e.g., 30°C) is delivered to the first heat exchange side of the water source heat pump unit via the ninth valve 9, heat source-side water pump 16, and tenth valve 10. After absorbing the heat from the high-temperature heat source water, the water source heat pump unit outputs low-temperature heat source water (e.g., 25°C), which is then delivered back to the air source heat pump via the eighth valve 8, completing one cycle. At this time, both the water source heat pump unit and the air source heat pump operate in heating mode.

[0075] In the fourth case, valves 11, 12, 13, and 14 are simultaneously turned on, while all other valves are closed, and the air source heat pump heating mode is activated.

[0076] Please see Figure 1Hot water return from the load side (e.g., 50°C) flows into the air source heat pump via the water collector, load-side water pump 15, eleventh valve 11, and thirteenth valve 13. The air source heat pump heats the return water, and the outlet water (e.g., 55°C) enters the distributor and the load side via fourteenth valve 14 and twelfth valve 12. Eleventh valve 11 and twelfth valve 12 are indoor valves, while thirteenth valve 13 and fourteenth valve 14 are outdoor valves. At this time, the water source heat pump unit stops, and the air source heat pump operates in heating mode.

[0077] The above provides two cooling modes and two heating modes. You can determine which mode to use based on energy efficiency.

[0078] In some embodiments, the water source heat pump includes multiple water source heat pump units connected in parallel; and / or, both the load-side water pump and the heat source-side water pump include multiple water pumps connected in parallel; and / or, the number of cooling towers is multiple.

[0079] Please see Figure 1 The number of water source heat pump units, the number of water pumps on the load side and the heat source side, and the number of cooling towers can all be set to meet more complex usage scenarios.

[0080] For the control method of the composite energy coupling system provided by the second aspect embodiment of the present invention, please refer to [link / reference]. Figure 2 and Figure 3 This includes the following steps:

[0081] S100, Obtain the operating mode of the composite energy coupling system.

[0082] S210. If the operating mode is determined to be water source heat pump cooling mode, then control the first valve, second valve, third valve, fourth valve and fifth valve to be turned on simultaneously, and all other valves to be turned off.

[0083] Please see Figure 1 The cooling water outlet from the load side (e.g., 12°C) flows into the first heat exchange side of the water source heat pump unit via the water collector, load-side water pump 15, and first valve 1. After the water source heat pump unit cools the return water, the outlet water (e.g., 7°C) enters the water distributor via the second valve 2 and is supplied to the load side. The high-temperature cooling water outlet from the second heat exchange side of the water source heat pump unit (e.g., 35°C) enters the cooling tower via the third valve 3. After sufficient heat dissipation, the low-temperature cooling water return water (e.g., 30°C) is returned to the second heat exchange side of the water source heat pump unit via the fourth valve 4, heat source-side water pump 16, and fifth valve 5. At this time, the water source heat pump unit operates in cooling mode, and the air source heat pump is shut down.

[0084] S220. If the operating mode is determined to be air-source-water combined refrigeration mode, then the first, second, third, fourth, fifth, eleventh, twelfth, thirteenth and fourteenth valves will be opened simultaneously, and all other valves will be closed.

[0085] Please see Figure 1 The cooling water outlet from the load side (e.g., 12°C) passes through the water collector and the load-side water pump 15. Part of it flows into the first heat exchange side of the water source heat pump unit through the first valve 1. After the water source heat pump unit cools the return cooling water, the outlet water (e.g., 7°C) enters the distributor through the second valve 2 and is supplied to the load side. The other part flows into the air source heat pump through the eleventh valve 11 and the thirteenth valve 13. After the air source heat pump cools the return water, the outlet water (e.g., 7°C) mixes with the return cooling water of the water source heat pump unit through the fourteenth valve 14 and the twelfth valve 12, and then enters the distributor and is supplied to the load side. The high-temperature cooling water outlet (e.g., 35°C) from the second heat exchange side of the water source heat pump unit enters the cooling tower through the third valve 3. After sufficient heat dissipation, the low-temperature cooling water return water (e.g., 30°C) is sent back to the second heat exchange side of the water source heat pump unit through the fourth valve 4, the heat source side water pump 16, and the fifth valve 5. At this time, the water source heat pump unit is operating in cooling mode, and the air source heat pump is operating in cooling mode.

[0086] S230. If the operating mode is determined to be air-source-water combined heating mode, then control valves six, seven, eight, nine and ten to be turned on simultaneously, and all other valves to be turned off.

[0087] Please see Figure 1 The hot water return from the load side (e.g., 50°C) flows into the second heat exchange side of the water source heat pump unit via the water collector, load-side water pump 15, and sixth valve 6. After the water source heat pump unit heats the return water, the outlet water (e.g., 55°C) enters the distributor and the load side through the seventh valve 7. When the air source heat pump operates in heating mode, the high-temperature heat source water (e.g., 30°C) is delivered to the first heat exchange side of the water source heat pump unit via the ninth valve 9, heat source-side water pump 16, and tenth valve 10. After absorbing the heat from the high-temperature heat source water, the water source heat pump unit outputs low-temperature heat source water (e.g., 25°C), which is then delivered back to the air source heat pump via the eighth valve 8, completing one cycle. At this time, both the water source heat pump unit and the air source heat pump operate in heating mode.

[0088] S240. If the operating mode is determined to be air source heat pump heating mode, then valves 11, 12, 13 and 14 will be opened simultaneously, and all other valves will be closed.

[0089] Please see Figure 1Hot water return from the load side (e.g., 50°C) flows into the air source heat pump via the water collector, load-side water pump 15, eleventh valve 11, and thirteenth valve 13. The air source heat pump heats the return water, and the outlet water (e.g., 55°C) enters the distributor and the load side via fourteenth valve 14 and twelfth valve 12. Eleventh valve 11 and twelfth valve 12 are indoor valves, while thirteenth valve 13 and fourteenth valve 14 are outdoor valves. At this time, the water source heat pump unit stops, and the air source heat pump operates in heating mode.

[0090] As can be seen from the above, the composite energy coupling system provided in this embodiment of the invention can switch the on / off state of some of the multiple valves according to the operating mode to enable at least one of the water source heat pump and air source heat pump to work, so as to meet the usage requirements in different environments.

[0091] According to an embodiment of the present invention, the step of obtaining the operating mode of the composite energy coupling system further includes:

[0092] S110. If the operating mode is determined to be the heating mode, then obtain the first total power of the air source heat pump heating mode and the second total power of the air source-water source combined heating mode when the heating capacity is the same on the same load side.

[0093] S120: Switch the heating mode to air source heat pump heating mode or air source-water source combined heating mode based on the first total power and the second total power.

[0094] In step S110, the heating mode includes an air source heat pump heating mode and an air source-water source combined heating mode, wherein:

[0095] In air source heat pump heating mode: the air source heat pump's heating COP at the current ambient temperature 直 Load-side heating capacity Q 热 The first total power is P 直 Then P 直 =Q 热 / COP 直 .

[0096] In the combined air-source and water-source heating mode: the air-source heat pump outlet water temperature is 15℃-35℃, and the heating COP is [missing information] at the current ambient temperature. 间 The heating COP of the water source heat pump unit under current operating conditions 水 The power of the water pump on the heat source side, P 泵 calorific value Q 热 The second total power is P 间 , where P 间 =Q 热 / COP 水 +(Q 热 -Q 热 / COP水 ) / COP 间 +P 泵 .

[0097] In step S120, the heating mode is switched between air source heat pump heating mode and air source-water source combined heating mode based on the first total power and the second total power, i.e., when the heating capacity Q... 热 Under the same conditions, the first total power is determined to be P. 直 The second total power is P 间 The first total power is P 直 The second total power is P 间 Therefore, choosing a smaller total input power helps improve the overall energy efficiency of the composite energy coupling system.

[0098] In some embodiments, the step of switching the heating mode to an air source heat pump heating mode or an air source-water source combined heating mode based on a first total power and a second total power specifically includes:

[0099] S121. If the first total power is determined to be greater than the second total power, then the air source-water source combined heating mode is operated.

[0100] S122. If the first total power is determined to be less than the second total power, then the air source heat pump heating mode is activated.

[0101] S123. If the first total power is determined to be equal to the second total power, then the current heating mode shall be maintained.

[0102] In steps S121 and S122, when the first total power is greater than the second total power, the air-source-water source combined heating mode is operated; when the first total power is less than the second total power, the air-source heat pump heating mode is operated. That is, when the heating capacity Q... 热 Under the same conditions, compare the first total power P. 直 The second total power is P 间 The size, the first total power is P 直 The second total power is P 间 Choosing a smaller total input power for power consumption / energy consumption helps improve the overall energy efficiency of the composite energy coupling system.

[0103] In step S123, when the first total power equals the second total power, the current heating mode is maintained and there is no need to adjust the operating mode.

[0104] In actual operation, the first total power P 直 Second total power P 间Since there are many similar situations, the combined energy coupling system needs to frequently switch between air source heat pump heating mode and air source-water source combined heating mode, which may affect the service life of the unit and valves.

[0105] In some cases, mode switching only occurs when the first total power differs from the second total power by a certain range. For example, when the first total power is greater than the sum of the second total power and a preset threshold (e.g., greater than the second total power + 1.05%), the air-source-water source combined heating mode is activated. When the first total power is less than the difference between the second total power and the preset threshold (e.g., the second total power - 1.05%), the air-source heat pump heating mode is activated. When the first total power is between the second total power and ± 1.05%, the current heating mode is maintained, and no adjustment to the operating mode is required. In this embodiment, frequent adjustments to the unit and valves are avoided when the first total power fluctuates around the second total power, balancing the system's high energy efficiency and stability.

[0106] In some embodiments, the step of operating the air-source-water combined heating mode or the step of operating the air-source heat pump heating mode further includes, prior to:

[0107] S1200: Obtain the current heating mode.

[0108] S1201 If the current heating mode is determined to be the same as the heating mode to be operated, then the current heating mode shall be maintained.

[0109] S1202. If it is determined that the current heating mode is different from the heating mode to be operated, the first total power and the second total power are continuously monitored, and after the duration of the mode switching condition is longer than the first preset duration, the mode is switched to the heating mode to be operated.

[0110] In step S1201, if the current heating mode is the same as the heating mode to be operated, the current heating mode is maintained. The composite energy coupling system does not need to make a switching action, so the system can maintain efficient operation.

[0111] In step S1202, the current heating mode is different from the heating mode to be operated. According to steps S121 and S122, the operating mode of the composite energy coupling system needs to be switched immediately. If the mode switching conditions fluctuate, the composite energy coupling system needs to switch back and forth between the air source-water source combined heating mode and the air source heat pump heating mode, which reduces the stability and service life of the system.

[0112] In this embodiment, step S1202 adds a mode switching hysteresis step. After the duration of meeting the mode switching conditions exceeds a first preset duration, for example, more than 48 hours, the composite energy coupling system is switched to the heating mode to be operated. The purpose of this embodiment is to allow the system to stabilize completely before switching the system's operating mode, thereby improving the system's stability during heating and reducing wear during system mode switching.

[0113] According to an embodiment of the present invention, the step of obtaining the operating mode of the composite energy coupling system further includes:

[0114] S130. If the operating mode is determined to be cooling mode, then obtain the cooling water return temperature, cooling water outlet temperature, number of water pumps on the load side, number of water pumps on the heat source, single unit power of the water source heat pump unit, unit load rate, and heating capacity per unit power.

[0115] S131. Determine the number of water source heat pump units based on the cooling water return temperature, cooling water outlet temperature, number of water pumps on the load side, number of water pumps on the heat source, power of a single unit, unit load rate, and heating capacity per unit power.

[0116] Steps S130 and S131 provide a method for optimal energy efficiency control of a refrigeration room. For example: Let the required cooling capacity Q... 冷 Number of operating water source heat pump units i, and unit load rate LR under i operating water source heat pump units i Based on the current cooling water inlet temperature, cooling water outlet temperature, and unit load rate, the unit's energy efficiency characteristic equation f(LR) is used to determine the energy efficiency characteristic equation. i ,T 却 ,T 冻 The COP of a water source heat pump unit can be calculated using either a table lookup method or by using a lookup table. i In addition, when the number of operating water source heat pump units varies, the load-side water pumps and heat source-side water pumps must also be adjusted accordingly. Let the number of units be i, and the power of a single load-side water pump be P. 却i The power of a single load-side water pump is P. 冷i The total power of the water source heat pump unit, the load-side water pump, and the heat source-side water pump is P. i P i =Q 冷 / COP i +iP 却i +iP 冷i Different operating modes are selected through calculation.

[0117] For example: A project uses 3 water source heat pump units, each with a cooling capacity of 1000kW. There are 4 pumps on the load side and 4 pumps on the heat source side, with 3 pumps in operation and 1 on standby. The power of each pump is 22kW and 30kW respectively. The minimum operating frequency of the pumps is 30Hz. The cooling water outlet temperature is 7℃, and the cooling water return temperature is 30℃. The current cooling capacity requirement is Q. 冷 =1000kW, then the calculation results are as follows:

[0118] One water source heat pump unit is running: main unit load rate 100%, COP1 = 6.0, total power P1 = 1000 / 6 + 1*22 + 1*30 = 218.7kW.

[0119] Two water source heat pump units are running: main unit load rate 50%, COP2 = 6.5, total power P2 = 1000 / 6.5 + 2*22*(30 / 50)^3 + 2*30*(30 / 50)^3 = 176.3kW.

[0120] Three water source heat pump units are running: main unit load rate 100%, COP3 = 6.3, total power P3 = 1000 / 6.3 + 3*22*(30 / 50)^3 + 3*30*(30 / 50)^3 = 192.4kW.

[0121] Based on the above calculations, the combined energy coupling system achieves the highest energy efficiency when two water source heat pump units are running. Therefore, according to the current operating mode:

[0122] If the current operating mode is to run 2 machines, then continue in this mode;

[0123] If the current operating mode is 1 machine running, continue to judge. If it is judged to be 2 machines running for 3 consecutive hours, adjust the operating mode to 2 machines running.

[0124] If the current operating mode is 3 machines running, continue to judge. If it is judged to be 2 machines running for 3 consecutive hours, adjust the operating mode to 2 machines running.

[0125] According to an embodiment of the present invention, the step of obtaining the operating mode of the composite energy coupling system further includes:

[0126] S140: Obtain the cooling tower heat dissipation, minimum water flow rate of a single cooling tower, outdoor wet-bulb temperature, set operating approximation, maximum heat dissipation capacity of a single cooling tower, and total number of cooling towers.

[0127] S141. Determine the number of operating cooling towers based on the cooling tower's heat dissipation, minimum water flow rate, outdoor wet-bulb temperature, set operating approximation, maximum heat dissipation capacity, and the total number of cooling towers.

[0128] S142. Determine the operating frequency of each cooling tower based on the number of operating towers.

[0129] In steps S140 to S142, a method for determining the number of operating cooling towers and the operating frequency of each cooling tower is given.

[0130] For example: minimum water flow rate L for a single cooling tower 塔 Outdoor wet-bulb temperature Tw, set operating approximation Tq, current maximum cooling tower heat dissipation capacity Q 塔 The cooling tower operates at a frequency F, and the number of cooling towers is N; when the required cooling tower heat dissipation is Q... 散 At that time, the cooling tower is controlled according to the supply water temperature Tg / return water temperature Th / temperature difference ΔT. The specific control strategy is as follows:

[0131] Step 1: Determine the number of operating cooling towers M1 based on the minimum water flow rate: M1 = Q 散 / △T / 1.163 / L 塔 ;

[0132] Step 2: Determine the number of cooling towers M2 to operate based on the required heat dissipation: M2 = Q 散 / Q 塔 Q_tower = f(Tq, Tw, Tg, ΔT);

[0133] Step 3: Compare the values ​​of {M1, M2, N} and use the maximum value as the number of cooling towers in operation, M = Max{M1, M2, N};

[0134] Step 4: After determining the number of operating units M, the operating frequency of each cooling tower fan is F = Q. 散 / (M×Q 塔 )*50.

[0135] According to one embodiment of the present invention, the composite energy coupling system further includes multiple humidity sensors, each corresponding to one of the multiple rooms. The step of obtaining the operating mode of the composite energy coupling system then includes:

[0136] S150: Record the temperature adjustment time of the cooling water outlet and detect the relative humidity in each room at second preset intervals.

[0137] S151. If the relative humidity in any room is greater than the first set relative humidity, and the time since the last temperature adjustment of the cooling water outlet is greater than the third preset time, and the cooling water outlet temperature is greater than or equal to the preset temperature, then the set temperature of the cooling water outlet is reduced by the first temperature value.

[0138] S152. If the relative humidity in all rooms is less than or equal to the second set relative humidity, and the time since the last temperature adjustment of the cooling water outlet is greater than the fourth preset time, then increase the set temperature of the cooling water outlet by the second temperature value.

[0139] S153. If the relative humidity in all rooms is greater than the second set relative humidity and less than or equal to the first set relative humidity, then maintain the set temperature of the cooling water outlet unchanged.

[0140] Steps S151 to S153 provide a method for controlling the cooling water outlet temperature. For example, during the cooling season, humidity sensors are installed in different rooms to detect the relative humidity T in each room every 30 minutes. di When {any room T} di > Set relative humidity value T ds If the following conditions are met: +2%, and the time since the last cooling water outlet temperature adjustment is >180 minutes, and the cooling water outlet temperature is ≥6.5℃, then the set temperature of the cooling water outlet of the water source heat pump unit will be reduced by 0.5℃; when {the relative humidity of all rooms T} is ≥2%, and the set temperature since the last cooling water outlet temperature adjustment is >180 minutes, and the set temperature since the last .... di ≤Set relative humidity value T ds If the relative humidity of all rooms is -2% and the time since the last cooling water outlet temperature adjustment is >180 minutes, then the set temperature of the cooling water outlet of the water source heat pump unit will be increased by 0.5℃; di > Set relative humidity value T ds -2%, relative humidity of all rooms (T) di ≤Set relative humidity value T ds When the +2% condition is met, the set temperature of the cooling water outlet of the water source heat pump unit will remain unchanged. The single adjustment increment of the set temperature of the cooling water outlet of the water source heat pump unit is 0.5℃ or other values, and the set relative humidity value T... ds The upper and lower limits are ±2% or other values.

[0141] In summary, the composite energy coupling system provided by the embodiments of the present invention includes a water collector, a load-side water pump, a water distributor, and a water source heat pump and an air source heat pump. The water collector is used to collect the cooling water return from the load side; the load-side water pump is connected to the outlet end of the water collector; the water distributor is used to distribute the cooling water outlet to the load side; the water source heat pump and the air source heat pump are disposed between the water collector and the water distributor; the load-side water pump, the water source heat pump, the air source heat pump, and the water distributor are connected by pipelines; valves are installed on the pipelines at different locations; the on / off state of some of the multiple valves is switched according to the operating mode to make at least one of the water source heat pump and the air source heat pump work. When the composite energy coupling system is running, by controlling the on / off state of the valves on the multiple pipelines, the flow path and flow direction of the cooling water can be controlled, thereby making at least one of the water source heat pump and the air source heat pump work. When operating in heating or cooling mode, the heat source or cold source of the composite energy coupling system can be adjusted to select the most energy-efficient heat pump to provide services to users, thereby reducing the overall energy consumption of the system, improving the heat exchange efficiency of the system, and one composite energy coupling system can meet the user's needs, reducing the initial investment cost and facilitating the promotion and use of composite energy coupling systems.

[0142] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A control method of a composite energy coupling system, characterized in that the system comprises: a water collector for collecting cooling water return from a load side; a load side water pump connected to an outlet of the water collector for adjusting pressure and flow rate of the cooling water return flowing downstream; a water distributor for distributing cooling water outlet to the load side; and an air source heat pump and a water source heat pump arranged between the water collector and the water distributor, the load side water pump, the water source heat pump, the air source heat pump and the water distributor being connected by pipelines, valves being arranged on the pipelines at different positions, and at least one of the water source heat pump and the air source heat pump being operated by switching on and off states of some of the valves according to operation modes, the cooling water return being exchanged heat with the operated heat pump along the pipelines to form the cooling water outlet; the water source heat pump comprises a water source heat pump unit, a cooling tower and a heat source side water pump, the water source heat pump unit comprises a first heat exchange side and a second heat exchange side; a first valve is arranged between an inlet of the first heat exchange side and the load side water pump, a second valve is arranged between an outlet of the first heat exchange side and the water distributor, a third valve is arranged between an outlet of the second heat exchange side and the cooling tower, a fourth valve is arranged between the cooling tower and the heat source side water pump, and a fifth valve is arranged between the heat source side water pump and an inlet of the second heat exchange side; a sixth valve is arranged between the load side water pump and the inlet of the second heat exchange side, a seventh valve is arranged between the outlet of the second heat exchange side and the water distributor, an eighth valve is arranged between the outlet of the first heat exchange side and the air source heat pump, a ninth valve is arranged between the heat source side water pump and the air source heat pump, and a tenth valve is arranged between the inlet of the first heat exchange side and the heat source side water pump; an eleventh valve and a thirteenth valve are arranged between the load side water pump and the air source heat pump, and a fourteenth valve and a twelfth valve are arranged between the air source heat pump and the water distributor; the control method comprises: obtaining an operation mode of the composite energy coupling system; determining that the operation mode is a water source heat pump cooling mode, and simultaneously switching on the first valve, the second valve, the third valve, the fourth valve and the fifth valve, and switching off all the other valves; determining that the operation mode is an air source-water source combined cooling mode, and simultaneously switching on the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the eleventh valve, the twelfth valve, the thirteenth valve and the fourteenth valve, and switching off all the other valves; and determining that the operation mode is an air source-water source combined heating mode, and simultaneously switching on the sixth valve, the seventh valve, the eighth valve, the ninth valve and the tenth valve, and switching off all the other valves. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ If the operation mode is determined as the air source heat pump heating mode, the eleventh valve, the twelfth valve, the thirteenth valve and the fourteenth valve are controlled to be turned on at the same time, and the remaining valves are all closed; The composite energy coupling system further comprises a plurality of humidity sensors, and the plurality of humidity sensors are arranged in the plurality of rooms one by one; after the step of obtaining the operation mode of the composite energy coupling system, the method further comprises the following steps: Recording the temperature adjustment time of the cooling water outlet, and detecting the relative humidity in each room every second preset time interval; If the relative humidity in any room is greater than a first set relative humidity, and the time interval from the last temperature adjustment time of the cooling water outlet is greater than a third preset time interval, and the cooling water outlet temperature is greater than or equal to a preset temperature, the set temperature of the cooling water outlet is reduced by a first temperature value; If the relative humidity in all rooms is less than or equal to a second set relative humidity, and the time interval from the last temperature adjustment time of the cooling water outlet is greater than a fourth preset time interval, the set temperature of the cooling water outlet is increased by a second temperature value; If the relative humidity in all rooms is greater than the second set relative humidity and less than or equal to the first set relative humidity, the set temperature of the cooling water outlet is maintained unchanged.

2. The control method of the compound energy coupling system according to claim 1, wherein, The water source heat pump comprises a plurality of parallel water source heat pump units; And / or, the load side water pump and the heat source side water pump each comprise a plurality of parallel water pumps; And / or, the number of cooling towers is a plurality.

3. The control method of the compound energy coupling system according to claim 1, wherein, After the step of obtaining the operation mode of the composite energy coupling system, the method further comprises the following steps: If the operation mode is determined as the heating mode, the first total power of the air source heat pump heating mode and the second total power of the air source-water source combined heating mode are obtained when the same load side heating capacity is achieved; According to the first total power and the second total power, the heating mode is switched to the air source heat pump heating mode or the air source-water source combined heating mode.

4. The control method of the composite energy coupling system according to claim 3, wherein, The step of switching the heating mode to the air source heat pump heating mode or the air source-water source combined heating mode according to the first total power and the second total power specifically comprises the following steps: If the first total power is greater than the second total power, the air source-water source combined heating mode is run; If the first total power is less than the second total power, the air source heat pump heating mode is run; If the first total power is equal to the second total power, the current heating mode is maintained.

5. The control method of the composite energy coupling system according to claim 4, wherein, Before the step of running the air source-water source combined heating mode or the step of running the air source heat pump heating mode, the method further comprises the following steps: The current heating mode is obtained; If the current heating mode is the same as the heating mode to be run, the current heating mode is maintained; If the current heating mode is different from the heating mode to be run, the first total power and the second total power are continuously monitored, and when the duration of the mode switching condition is greater than a first preset time interval, the heating mode is switched to the heating mode to be run.

6. The control method of the composite energy coupling system according to claim 1, wherein, The step of acquiring the operation mode of the composite energy coupling system further comprises: when the operation mode is determined as the cooling mode, acquiring the cooling water return water temperature, the cooling water outlet water temperature, the number of water pumps of the load-side water pump, the number of water pumps of the heat source water pump, the single unit power of the water source heat pump unit, the unit load rate of the water source heat pump unit, and the unit power heating capacity; determining the number of units of the water source heat pump unit according to the cooling water return water temperature, the cooling water outlet water temperature, the number of water pumps of the load-side water pump, the number of water pumps of the heat source water pump, the single unit power, the unit load rate of the water source heat pump unit, and the unit power heating capacity.

7. The control method of the composite energy coupling system according to claim 6, wherein, The step of acquiring the operation mode of the composite energy coupling system further comprises: acquiring the cooling tower heat dissipation, the minimum water flow of a single cooling tower, the outdoor wet bulb temperature, the set operation approximation degree, the maximum heat dissipation capacity of a single cooling tower, and the total number of cooling towers; determining the operation number of the cooling towers according to the cooling tower heat dissipation, the minimum water flow, the outdoor wet bulb temperature, the set operation approximation degree, the maximum heat dissipation capacity, and the total number of cooling towers; determining the operation frequency of each cooling tower according to the operation number.

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