Control methods, devices, computer equipment, and storage media for dual-generation heat pumps

Abstract

This invention relates to a control method, apparatus, computer equipment, and storage medium for a dual-heat pump. The dual-heat pump includes a compressor, a finned heat exchanger, a shell-and-tube heat exchanger, a variable frequency water pump, a temperature sensor, and a flow sensor. The control method includes the following steps: starting the water pump, adjusting the real-time flow rate according to a first preset adjustment method, and controlling the real-time flow rate change rate to within 0.035 m³ / s. 3 / h·s~0.05m 3 / h·s, real-time flow rate = first preset flow rate, the pump runs for a first preset time, then the compressor starts; based on the difference between the set outlet water temperature and the real-time temperature, the real-time flow rate is adjusted according to the second preset adjustment method, and the rate of change of real-time flow rate is controlled within 0.07m. 3 / h·s~0.15m 3 / h·s; When the difference between the set outlet water temperature and the real-time temperature is ≤0, the compressor is turned off, and the real-time flow rate is adjusted according to the third preset adjustment method, with the real-time flow rate change rate controlled within 0.6m³ / h·s. 3 / h·s~0.12m 3 / h·s until the water pump is turned off. This invention optimizes energy efficiency while avoiding water hammer, and has the advantages of good reliability and stability, and excellent energy efficiency.

Description

Technical Field

[0001] This invention relates to the field of heat pump control, and in particular to control methods, devices, computer equipment, and storage media for dual-supply heat pumps. Background Technology

[0002] Dual-mode heat pump units offer both cooling and heating capabilities and primarily consist of a compressor, finned heat exchanger, coaxial heat exchanger, and water pump. Traditional dual-mode heat pump units typically use fixed-frequency water pumps, requiring calculation of the rated flow rate based on the unit's rated capacity during the initial design phase to select a pump with a suitable load. However, fixed-frequency water pumps are unsuitable for heat pump unit development. Firstly, commercially available water pumps are generally designed for applications such as user water supply, large equipment water supply, and chemical water supply, with limited models specifically designed for heat pump units. Therefore, using fixed-frequency pumps significantly restricts the design of heat pump units. Secondly, fixed-frequency pumps can only operate at a fixed frequency, hindering energy efficiency optimization. Current dual-mode heat pump units consider using variable-frequency water pumps and employ control methods to improve energy efficiency.

[0003] Through extensive practical experience, the inventors discovered that current dual-heat pump units using variable frequency water pumps, in order to improve energy efficiency, directly adjust the operating frequency of the water pumps. However, during the start-up and shutdown of the variable frequency water pumps, changes in the number of pipes connected to the water pumps, and changes in the water pump's operating speed, water hammer noise is generated in the water system, affecting the user experience. Furthermore, the long-term presence of water hammer can damage the pipes, shorten their service life, and pose certain safety hazards. Summary of the Invention

[0004] Based on this, the purpose of this invention is to provide a control method for a dual-generation heating pump, which adjusts the real-time flow rate of the pump according to a certain flow rate change rate based on the difference between the set outlet water temperature and the real-time temperature, thereby improving the energy efficiency of the unit while avoiding water hammer. It has the advantages of high reliability, high stability, and superior energy efficiency.

[0005] A control method for a dual-heat pump, wherein the dual-heat pump includes a compressor, a finned heat exchanger, a shell-and-tube heat exchanger, a variable frequency water pump, a temperature sensor, and a flow sensor;

[0006] The control method for the dual-heat pump includes the following steps:

[0007] In heating mode, the compressor is started and runs for a first preset time; then the water pump is started, the real-time flow rate detected by the flow sensor is acquired, and the real-time flow rate is adjusted according to a first preset adjustment method. When the real-time flow rate equals the first preset flow rate, the water pump runs for a first preset time. The first preset adjustment method includes the following steps: controlling the rate of change of the real-time flow rate to 0.035 m³ / s. 3 / h·s~0.05m 3 / h·s;

[0008] Next, the real-time temperature detected by the temperature sensor is acquired. Based on the difference between the set outlet water temperature and the real-time temperature, the real-time flow rate is adjusted according to the second preset adjustment method. The second preset adjustment method includes the following steps: controlling the rate of change of the real-time flow rate to 0.07m. 3 / h·s~0.15m 3 / h·s;

[0009] When the difference between the set outlet water temperature and the real-time temperature is ≤0, the compressor is turned off, and the real-time flow rate is adjusted according to the third preset adjustment method until the water pump is turned off; the third preset adjustment method includes the following steps: controlling the rate of change of the real-time flow rate to 0.6m 3 / h·s~0.12m 3 / h·s.

[0010] The control method for the dual-unit heating pump described in this invention adjusts the real-time flow rate of the pump according to a certain flow rate change rate based on the difference between the set outlet water temperature and the real-time temperature, thereby improving the unit's energy efficiency while avoiding water hammer. It has the advantages of high reliability, high stability, and superior energy efficiency.

[0011] Furthermore, the first preset adjustment method also includes the following steps: if the real-time flow rate is greater than the first preset flow rate or less than the first preset flow rate when the preset frequency increase time is reached, the dual-unit heat pump performs three fault determinations. If the results of the three fault determinations are all positive, the pump is shut down and a fault signal is issued. The preset frequency increase time = first preset flow rate / real-time flow rate change rate. The fault determination method is: after the preset fault determination time has elapsed, if the real-time flow rate is greater than the first preset flow rate or less than the first preset flow rate, the fault determination result is positive. Based on the real-time flow rate, pump abnormalities are identified, reported, and the pump is shut down to prevent the heat pump from undergoing subsequent adjustments with an abnormal pump, which could damage the heat pump unit.

[0012] Furthermore, the second preset adjustment method also includes the following steps: if the difference between the set outlet water temperature and the real-time temperature is greater than or equal to the first preset temperature difference value, the real-time flow rate is increased; if 0 < the difference between the set outlet water temperature and the real-time temperature < the first preset temperature difference value, the current real-time flow rate is maintained. Adjusting the real-time flow rate of the water pump according to the proximity of the real-time temperature to the set outlet water temperature makes the adjustment process more precise and energy-efficient.

[0013] Furthermore, the second preset adjustment method also includes the following steps: when the real-time flow rate = first preset flow rate + (n-1) * preset flow rate difference, and the real-time flow rate is less than the second preset flow rate, the dual-flow heating pump is allowed to run continuously at the current real-time flow rate for a first buffer time. If the difference between the set outlet water temperature and the real-time temperature is >0, the real-time flow rate continues to be adjusted according to the second preset adjustment method, where n is an integer greater than 1. Setting a buffer platform for real-time flow rate adjustment effectively avoids over-adjustment of the flow rate, improves the accuracy of flow rate adjustment, and achieves better energy efficiency.

[0014] Furthermore, the second preset adjustment method also includes the following steps: when the real-time flow rate is ≥ (first preset flow rate + n * preset flow rate difference), if the difference between the set outlet water temperature and the real-time temperature is < 2℃, then the real-time flow rate is reduced to (real-time flow rate = first preset flow rate + (n-1) * preset flow rate difference), allowing the dual-unit heating pump to continue operating at the current real-time flow rate for a first buffer time; if the difference between the set outlet water temperature and the real-time temperature is > 0, then the real-time flow rate continues to be adjusted according to the second preset adjustment method, where n is an integer greater than 1. Setting a buffer platform when reducing the real-time flow rate avoids excessive flow rate reduction, improves the accuracy of flow rate adjustment, and enhances energy efficiency.

[0015] Furthermore, the second preset adjustment method also includes the following steps: when the real-time flow rate equals the second preset flow rate, if the difference between the set outlet water temperature and the real-time temperature is greater than or equal to the first preset temperature difference value, the current real-time flow rate is maintained; if 0 < the difference between the set outlet water temperature and the real-time temperature < the first preset temperature difference value, the real-time flow rate is reduced. When the real-time flow rate reaches the maximum flow rate that the water pump can withstand, the flow rate is no longer increased to avoid overloading the water pump and ensure stable operation of the water pump.

[0016] Furthermore, the adjustment period of the first preset adjustment method is 60s to 90s, the adjustment period of the second preset adjustment method is 10s to 20s, and the adjustment period of the third preset adjustment method is 30s to 60s. Setting appropriate adjustment periods according to different adjustment purposes can effectively avoid excessive adjustment sensitivity and over-adjustment, making the adjustment process more precise and energy-efficient.

[0017] The present invention also provides a control device for a dual-heat pump, including:

[0018] The data acquisition module is used to acquire the real-time flow rate detected by the flow sensor, the real-time temperature detected by the temperature sensor, and the set outlet water temperature.

[0019] The judgment module is used to determine whether the real-time flow rate is equal to the first preset flow rate and whether the difference between the set outlet water temperature and the real-time temperature is not greater than 0.

[0020] The execution module is configured to adjust the real-time flow rate according to a first preset adjustment method, and when the real-time flow rate equals the first preset flow rate, to run the water pump for a first preset time; to adjust the real-time flow rate according to a second preset adjustment method based on the difference between the set outlet water temperature and the real-time temperature; and to turn off the compressor and adjust the real-time flow rate according to a third preset adjustment method when the difference between the set outlet water temperature and the real-time temperature is ≤0, until the water pump is turned off.

[0021] The present invention also provides a computer device, comprising:

[0022] At least one memory and at least one processor;

[0023] The memory is used to store one or more computer programs, which, when executed by a processor, are used to implement the steps of the control method for any of the dual-heat pumps described above.

[0024] When the one or more computer programs are executed by the at least one processor, the at least one processor implements the steps of the control method for any of the dual-heat pumps described above.

[0025] The present invention also provides a storage medium containing computer-executable instructions, which, when executed by a computer processor, are used to perform the steps of the control method for any of the dual-heat pumps described above.

[0026] The beneficial effects of this application are as follows:

[0027] 1. Adjust the real-time flow rate of the water pump according to a certain flow rate change rate based on the difference between the set outlet water temperature and the real-time temperature, thereby improving the unit's energy efficiency while avoiding water hammer.

[0028] 2. Identify and report pump malfunctions based on real-time flow and shut down the pump to prevent the heat pump from undergoing subsequent adjustments while carrying an malfunctioning pump, which could damage the heat pump unit.

[0029] 3. Adjust the real-time flow rate of the water pump according to the closeness between the real-time temperature and the set outlet water temperature, so that the adjustment process is more precise and the energy efficiency is better.

[0030] 4. Set up a buffer platform for real-time flow adjustment to effectively avoid excessive flow adjustment, improve the accuracy of flow adjustment, and achieve better energy efficiency.

[0031] 5. Set up a buffer platform when reducing real-time traffic to avoid excessive traffic reduction, improve the accuracy of traffic adjustment, and achieve better energy efficiency.

[0032] 6. When the real-time flow rate reaches the maximum flow rate that the water pump can withstand, the flow rate will not be increased to avoid overloading the water pump and ensure its stable operation.

[0033] 7. Setting appropriate adjustment cycles according to different adjustment purposes can effectively avoid excessive adjustment sensitivity and over-adjustment, making the adjustment process more precise and energy-efficient.

[0034] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of a dual-unit heat pump according to an embodiment of the present invention;

[0036] Figure 2 This is a flowchart illustrating a control method for a dual-unit heat pump according to an embodiment of the present invention;

[0037] Figure 3 This is a flowchart illustrating a control method for a dual-unit heat pump according to an embodiment of the present invention;

[0038] Figure 4 This is a flowchart illustrating a control method for a dual-unit heat pump according to an embodiment of the present invention;

[0039] Figure 5 This is a flowchart illustrating a control method for a dual-unit heat pump according to an embodiment of the present invention;

[0040] Figure 6 This is a flowchart illustrating a control method for a dual-unit heat pump according to an embodiment of the present invention;

[0041] Figure 7 This is a schematic diagram of the control device described in an embodiment of the present invention;

[0042] The components include a shell-and-tube heat exchanger 1, a variable frequency water pump 2, a temperature sensor 3, a flow sensor 4, a control device 5, a data acquisition module 501, a judgment module 502, and an execution module 503. Detailed Implementation

[0043] It should be understood that the described embodiments are merely some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of the embodiments of this application.

[0044] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0045] In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims. In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0046] Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0047] It should be understood that the embodiments of this application are not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from their scope. The scope of the embodiments of this application is limited only by the appended claims.

[0048] This invention provides a control method for a dual-heat pump. For ease of understanding, this invention exemplifies and describes a dual-heat pump applicable to the control method of the dual-heat pump described in this invention. It should be noted that the dual-heat pump exemplified in this invention for ease of understanding is merely schematic. The components with mutual relationships can be physically combined or physically separated. For example, the connection between two components can be a direct contact connection or an indirect connection achieved through a third component. Similarly, the fixing of two components can be direct or indirect. Those skilled in the art can select some or all of the modules to achieve the purpose of this disclosure according to actual needs.

[0049] An embodiment of the present invention provides a control method for a dual-generation heat pump; please refer to [link to relevant documentation]. Figure 1 The dual-unit heat pump includes a compressor, a finned heat exchanger, a shell-and-tube heat exchanger 1, a variable frequency water pump 2, a temperature sensor 3, and a flow sensor 4. The frequency regulation method for the variable frequency water pump provided in this embodiment can be executed by a frequency regulation device for the variable frequency water pump. This frequency regulation device can be implemented through software and / or hardware and integrated into the frequency regulation equipment of the variable frequency water pump. The frequency regulation equipment for the variable frequency water pump can be a computer or similar device.

[0050] Please see Figure 2 The control method for the dual-heat pump of this invention includes the following steps:

[0051] In heating mode, the water pump is started, and the real-time flow rate detected by the flow sensor is acquired. The real-time flow rate is then adjusted according to a first preset adjustment method, which requires controlling the rate of change of the real-time flow rate to within 0.035 m³ / s. 3 / h·s~0.05m 3 / h·s. It should be noted that for the same adjustment method in the same embodiment, a fixed real-time flow rate is generally selected for adjustment. In this embodiment, the real-time flow rate of the first preset adjustment method is 0.04m³ / h·s. 3 / h·s; The control of the real-time flow rate change rate can be obtained through pre-experimentation on the variable frequency water pump. Specifically, the operating frequency of the variable frequency water pump can be used as the independent variable and the current real-time flow rate change rate of the system can be used as the dependent variable. By conducting multiple sets of experiments and fitting the data, relatively accurate control of the real-time flow rate change rate can be achieved. The first preset adjustment method described in this embodiment of the invention includes the following steps: with 0.04m 3The rate of change of real-time flow rate ( / h·s) increases the operating frequency of the variable frequency water pump. When the real-time flow rate equals the first preset flow rate, the water pump is run for a first preset time, then the compressor is started and run for a second time. In this embodiment, the first preset flow rate is 60% of the rated water flow rate of the variable frequency water pump. In other embodiments, the first preset flow rate can be adjusted according to the parameters of the water pump and the needs of the dual-supply heat pump system to avoid the heat pump system from experiencing a decrease in heat exchange efficiency, internal overheating of the heat exchanger, and severe pressure increase due to insufficient water flow, which could damage internal components and the compressor. In this embodiment, the first preset time is 15s. In other embodiments, the first preset time can be adjusted between 10s and 30s to ensure that the water pump can operate stably. If the first preset time is too long (specifically, in this embodiment, it means that the first preset time exceeds 30s), the energy efficiency of the dual-supply heat pump will be degraded. In this embodiment, the second preset time is 15s. In other embodiments, the second preset time can be adjusted between 10s and 1min.

[0052] Next, the real-time temperature detected by the temperature sensor is acquired. Based on the difference between the set outlet water temperature and the real-time temperature, the real-time flow rate is adjusted according to the second preset adjustment method. The second preset adjustment method requires controlling the rate of change of the real-time flow rate to within 0.07m³. 3 / h·s~0.15m 3 / h·s, the real-time flow rate change rate of the second preset adjustment method in this embodiment is 0.1m³ / h·s. 3 The control method for the rate of change of real-time flow is the same as the first preset adjustment method mentioned above, so it will not be repeated. The second preset adjustment method includes the following steps: with a flow rate of 0.1m... 3 The real-time flow rate change rate per h·s increases / decreases the operating frequency of the variable frequency water pump. Specifically, when the difference between the set outlet water temperature and the real-time temperature is large, a rate of 0.1 m is used. 3 The real-time flow rate change rate per h·s increases the operating frequency of the variable frequency water pump. When the difference between the set outlet temperature and the real-time temperature is small, the flow rate can be increased by 0.1 m. 3 The real-time flow rate change rate per h·s reduces the operating frequency of the variable frequency water pump; in this embodiment of the invention, the set outlet water temperature refers to the outlet water temperature that the user sets when using the dual-heat pump and that the shell-and-tube heat exchanger ultimately needs to reach, and the real-time temperature refers to the actual outlet water temperature of the shell-and-tube heat exchanger.

[0053] When the difference between the set outlet water temperature and the real-time temperature is ≤0, the actual outlet water temperature meets the user's requirements. The compressor is then turned off to stop heating, saving energy. The real-time flow rate is then adjusted according to the third preset adjustment method, which requires controlling the rate of change of the real-time flow rate to within 0.6m³. 3 / h·s~0.12m 3The real-time flow rate change rate of the third preset adjustment method in this embodiment is 0.8 m³ / h until the water pump is shut off. The control method for the real-time flow rate change rate is the same as the aforementioned first preset adjustment method, so it will not be described in detail. The third preset adjustment method includes the following steps: reducing the operating frequency of the variable frequency water pump with a real-time flow rate change rate of 0.8 m³ / h. This embodiment of the invention provides a control method for a dual-unit heating pump that adjusts the real-time flow rate of the water pump according to the difference between the set outlet water temperature and the real-time temperature at a certain flow rate change rate, thereby improving the unit's energy efficiency while avoiding water hammer. It has the advantages of high reliability, high stability, and superior energy efficiency.

[0054] When the variable frequency water pump or pipeline malfunctions, the flow rate may be too low, resulting in slow flow rate increase and slow unit adjustment, thus increasing the unit's energy efficiency. In a further embodiment, the first preset adjustment method also includes the following steps: if the real-time flow rate is greater than or less than the first preset flow rate when the preset frequency increase time is reached, the dual-unit heat pump performs three fault determinations. If all three fault determinations result in "yes", the unit is shut down and a fault signal is issued. The preset frequency increase time = first preset flow rate / real-time flow rate change rate; in this embodiment, the preset frequency increase time is 75 seconds. The fault determination method is as follows: after the preset fault determination time has elapsed, if the real-time flow rate is greater than or less than the first preset flow rate, the fault determination result is "yes". By identifying and reporting pump malfunctions based on real-time flow and shutting down the unit, the heat pump is prevented from undergoing subsequent adjustments with the malfunctioning pump, which could damage the heat pump unit.

[0055] To further optimize the energy efficiency of the dual-generation heat pump, in a further embodiment, please refer to... Figure 3 The second preset adjustment method further includes the following steps: if the difference between the set outlet water temperature and the real-time temperature is greater than or equal to the first preset temperature difference value, increase the real-time flow rate; if 0 < the difference between the set outlet water temperature and the real-time temperature < the first preset temperature difference value, maintain the current real-time flow rate. In this embodiment, the first preset temperature difference value is 2℃. In other embodiments, the first preset temperature difference value can be reasonably selected based on the temperature hysteresis involved in the temperature shutdown logic of each water pump manufacturer. Adjusting the real-time flow rate of the water pump according to the closeness between the real-time temperature and the set outlet water temperature makes the adjustment process more precise and energy-efficient.

[0056] To further optimize the energy efficiency of the dual-generation heat pump, in a further embodiment, please refer to... Figure 4The second preset adjustment method further includes the following steps: when the real-time flow rate = first preset flow rate + (n-1) * preset flow rate difference, and the real-time flow rate is less than the second preset flow rate, the dual-flow heating pump is allowed to run continuously at the current real-time flow rate for a first buffer time. If the difference between the set outlet water temperature and the real-time temperature is >0, the real-time flow rate continues to be adjusted according to the second preset adjustment method. In this embodiment, n is an integer greater than 1, the preset flow rate difference is 15% of the pump's rated flow rate, and the second preset flow rate is 100% of the pump's rated flow rate. In other embodiments, the preset flow rate difference and the second preset flow rate should be determined according to the pump's flow rate adjustment range. When the adjustable flow rate range of the variable frequency pump is large enough, the preset flow rate difference can be subdivided into 10% to 15% of the pump's rated flow rate. In this embodiment, the first buffer time is 30 seconds. In other embodiments, the first buffer time can be selected between 20 seconds and 40 seconds. The selection should be guided by ensuring that the temperature change tends to stabilize after flow rate adjustment and does not consume too much unnecessary waiting time. Setting a buffer platform for real-time flow rate adjustment effectively avoids excessive flow rate adjustment, improves the accuracy of flow rate adjustment, and achieves better energy efficiency.

[0057] To further optimize the energy efficiency of the dual-generation heat pump, in a further embodiment, please refer to... Figure 5 The second preset adjustment method further includes the following steps: when the real-time flow rate is ≥ (first preset flow rate + n * preset flow rate difference), if the difference between the set outlet water temperature and the real-time temperature is < 2℃, then the real-time flow rate is reduced to (real-time flow rate = first preset flow rate + (n-1) * preset flow rate difference), allowing the dual-unit heating pump to continue operating at the current real-time flow rate for a first buffer time. If the difference between the set outlet water temperature and the real-time temperature is > 0, then the real-time flow rate continues to be adjusted according to the second preset adjustment method, where n is an integer greater than 1. Setting a buffer platform when reducing the real-time flow rate avoids excessive flow rate reduction, improves the accuracy of flow rate adjustment, and enhances energy efficiency.

[0058] To further ensure the stable operation of the water pump, in a further embodiment, please refer to... Figure 6 The second preset adjustment method further includes the following steps: when the real-time flow rate equals the second preset flow rate, the dual-flow heating pump continues to operate at the current real-time flow rate for a first buffer time. If the difference between the set outlet water temperature and the real-time temperature is greater than or equal to the first preset temperature difference value, the current real-time flow rate is maintained; if 0 < the difference between the set outlet water temperature and the real-time temperature < the first preset temperature difference value, the real-time flow rate is reduced. In this embodiment, due to the allowable capacity of the heat pump system, the second preset flow rate is selected as the maximum flow rate that the pump can operate normally. In other embodiments, the second preset flow rate should be selected as the maximum flow rate allowed by the entire system, taking into account the performance of the dual-flow heating pump system. When the real-time flow rate reaches the maximum flow rate that the pump can withstand, the flow rate is no longer increased to avoid overloading the pump and ensure stable operation of the pump.

[0059] To further optimize the energy efficiency of the dual-generation heat pump, in a further embodiment, the adjustment cycle of the first preset adjustment method is 60s to 90s, the adjustment cycle of the second preset adjustment method is 10s to 20s, and the adjustment cycle of the third preset adjustment method is 30s to 60s. Setting appropriate adjustment cycles according to different adjustment purposes can effectively avoid excessive adjustment sensitivity and over-adjustment, making the adjustment process more precise and energy-efficient.

[0060] Secondly, please refer to Figure 7 The present invention also provides a control device 5 for a dual-heat pump, comprising:

[0061] The data acquisition module 501 is used to acquire the real-time flow rate detected by the flow sensor, the real-time temperature detected by the temperature sensor, and the set outlet water temperature.

[0062] The judgment module 502 is used to determine whether the real-time flow rate is equal to the first preset flow rate and whether the difference between the set outlet water temperature and the real-time temperature is not greater than 0.

[0063] The execution module 503 is used to adjust the real-time flow rate according to a first preset adjustment method, and when the real-time flow rate = the first preset flow rate, to make the water pump run for a first preset time; to adjust the real-time flow rate according to a second preset adjustment method based on the difference between the set outlet water temperature and the real-time temperature; and to turn off the compressor and adjust the real-time flow rate according to a third preset adjustment method when the difference between the set outlet water temperature and the real-time temperature is ≤0, until the water pump is turned off.

[0064] In a further embodiment, the data acquisition module is further configured to acquire the real-time flow rate change rate of the first preset adjustment method and calculate the preset frequency increase time, and is also configured to acquire the number of times the dual-heat pump performs fault determination; the judgment module is further configured to determine whether the frequency increase time using the first preset adjustment method has reached the preset frequency increase time, and is also configured to determine the result of the fault determination, and is also configured to determine whether the results of the three fault determinations are all "yes"; the execution module is further configured to perform three fault determinations according to the fault determination method when the preset frequency increase time is reached and the real-time flow is greater than the first preset flow or the real-time flow is less than the first preset flow, and is also configured to stop the machine and issue a fault signal when the results of the three fault determinations are all "yes".

[0065] In a further embodiment, the judging module is further configured to judge whether the difference between the set outlet water temperature and the real-time temperature is greater than the first preset temperature difference value; the execution module is further configured to increase the real-time flow rate when the difference between the set outlet water temperature and the real-time temperature is ≥ the first preset temperature difference value, and to maintain the current real-time flow rate when 0 < the difference between the set outlet water temperature and the real-time temperature < the first preset temperature difference value.

[0066] In a further embodiment, the determination module is further configured to determine whether the real-time flow rate is equal to (first preset flow rate + preset flow rate difference) and whether the real-time flow rate is less than the second preset flow rate; the execution module is configured to, when the real-time flow rate is (first preset flow rate + preset flow rate difference) and the real-time flow rate is less than the second preset flow rate, cause the dual-unit heating pump to continue running at the current real-time flow rate for a first buffer time, and if the difference between the set outlet water temperature and the real-time temperature is > 0, then continue to adjust the real-time flow rate according to the second preset adjustment method.

[0067] In a further embodiment, the judgment module is further configured to determine whether the real-time flow rate is greater than or equal to (first preset flow rate + n * preset flow rate difference); the execution module is further configured to, when the real-time flow rate is ≥ (first preset flow rate + n * preset flow rate difference), if the difference between the set outlet temperature and the real-time temperature is < 2℃, reduce the real-time flow rate to (real-time flow rate = first preset flow rate + (n-1) * preset flow rate difference), and make the two-phase heating pump continue to run at the current real-time flow rate for a first buffer time; then, if the difference between the set outlet temperature and the real-time temperature is > 0, continue to adjust the real-time flow rate according to the second preset adjustment method, where n is an integer greater than 1.

[0068] In a further embodiment, the determination module is further configured to determine whether the real-time flow rate is equal to the second preset flow rate; the execution module is further configured to maintain the current real-time flow rate if the difference between the set outlet temperature and the real-time temperature is greater than or equal to the first preset temperature difference value when the real-time flow rate is equal to the second preset flow rate; and reduce the real-time flow rate if 0 < the difference between the set outlet temperature and the real-time temperature is less than the first preset temperature difference value.

[0069] In a further embodiment, the execution module is further configured to adjust the real-time flow at an adjustment interval of 60s to 90s when it is necessary to adjust the real-time flow according to the first preset adjustment method, adjust the real-time flow at an adjustment interval of 10s to 20s when it is necessary to adjust the real-time flow according to the second preset adjustment method, and adjust the real-time flow at an adjustment interval of 30s to 60s when it is necessary to adjust the real-time flow according to the third preset adjustment method.

[0070] The frequency regulation device of the variable frequency water pump provided in this application embodiment can be used to execute the control method of the dual-heat pump provided in the above embodiment, and has the corresponding functions and beneficial effects.

[0071] Thirdly, the present invention also provides a computer device that can integrate the control device for the dual-heat pump provided in the embodiments of this application. The computer device includes:

[0072] At least one memory and at least one processor;

[0073] A memory for storing one or more computer programs, which, when executed by a processor, are used to implement the steps of the control method for any of the above-mentioned dual-heat pumps.

[0074] When one or more computer programs are executed by at least one processor, the at least one processor implements the steps of the control method for any of the above-described dual-heat pumps.

[0075] The computer equipment provided above can be used to execute the control method of the dual-heat pump provided in the above embodiments, and has corresponding functions and beneficial effects.

[0076] Fourthly, the present invention also provides a storage medium containing computer-executable instructions, which, when executed by a computer processor, are used to perform the steps of any of the above-described control methods for a dual-heat pump.

[0077] Storage medium – any type of memory device or storage device. The term “storage medium” is intended to include: mounting media, such as CD-ROMs, floppy disks, or magnetic tape devices; computer system memory or random access memory, such as DRAM, DDR RAM, SRAM, EDO RAM, Rambus RAM, etc.; non-volatile memory, such as flash memory, magnetic media (e.g., hard disks or optical storage); registers or other similar types of memory elements, etc. Storage media may also include other types of memory or combinations thereof. Furthermore, storage media may reside in a first computer system in which a program is executed, or may reside in a different second computer system connected to the first computer system via a network (such as the Internet). The second computer system can provide program instructions to the first computer for execution. The term “storage medium” can include two or more storage media that may reside in different locations (e.g., in different computer systems connected via a network). Storage media may store program instructions (e.g., specifically implemented as a computer program) executable by one or more processors.

[0078] Of course, the computer-executable instructions provided in the embodiments of this application are not limited to the control method of the dual-heat pump as described above, but can also execute related operations in the control method of the dual-heat pump provided in any embodiment of this application.

[0079] The beneficial effects of this application are as follows:

[0080] 1. The real-time flow rate of the water pump is adjusted according to a certain rate of change based on the difference between the set outlet water temperature and the real-time temperature, thereby improving the unit's energy efficiency while avoiding water hammer. The installation of a flow sensor allows for real-time monitoring of the system's water flow, optimizing traditional flow switches and saving costs.

[0081] 2. Identify and report pump malfunctions based on real-time flow and shut down the pump to prevent the heat pump from undergoing subsequent adjustments while carrying an malfunctioning pump, which could damage the heat pump unit.

[0082] 3. Adjust the real-time flow rate of the water pump according to the closeness between the real-time temperature and the set outlet water temperature, so that the adjustment process is more precise and the energy efficiency is better.

[0083] 4. Set up a buffer platform for real-time flow regulation to effectively avoid water hammer caused by excessive flow fluctuations, effectively avoid over-regulation of flow, improve the accuracy of flow regulation, and achieve better energy efficiency.

[0084] 5. Setting up a buffer platform when reducing real-time traffic effectively avoids water hammer caused by excessive traffic fluctuations, prevents excessive traffic reduction, improves the accuracy of traffic regulation, and enhances energy efficiency.

[0085] 6. When the real-time flow rate reaches the maximum flow rate that the water pump can withstand, the flow rate will not be increased to avoid overloading the water pump and ensure its stable operation.

[0086] 7. Set appropriate adjustment cycles according to different adjustment purposes to effectively avoid water hammer caused by excessive flow fluctuations. This can also effectively avoid excessive adjustment sensitivity and over-adjustment, making the adjustment process more precise and energy-efficient.

[0087] This invention can gradually increase the water flow rate of the unit under high load demand by logic, thereby increasing the heat transfer rate. Before the unit is shut down at the set temperature, the unit gradually reduces the water flow rate by logic judgment, which greatly increases the unit's energy efficiency. At the same time, the change in the frequency of the compressor before the unit is shut down at the set temperature makes the water temperature change smooth.

[0088] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the 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 the present invention also intends to include these modifications and variations.

Claims

1. A control method for a dual-heat pump, characterized in that, The dual-unit heat pump includes a compressor, a finned heat exchanger, a shell-and-tube heat exchanger, a variable frequency water pump, a temperature sensor, and a flow sensor. The control method for the dual-heat pump includes the following steps: In heating mode, the water pump is started, the real-time flow rate detected by the flow sensor is acquired, and the real-time flow rate is adjusted according to a first preset adjustment method. When the real-time flow rate equals the first preset flow rate, the water pump is run for a first preset time, and then the compressor is started. The first preset adjustment method includes the following steps: controlling the rate of change of the real-time flow rate to 0.035 m³ / s. 3 / h·s~0.05m 3 / h·s; Next, the real-time temperature detected by the temperature sensor is acquired. Based on the difference between the set outlet water temperature and the real-time temperature, the real-time flow rate is adjusted according to the second preset adjustment method. The real-time temperature refers to the actual outlet water temperature of the shell-and-tube heat exchanger. The second preset adjustment method includes the following steps: controlling the rate of change of the real-time flow rate to 0.07 m³ / s. 3 / h·s~0.15m 3 / h·s; If the difference between the set outlet temperature and the real-time temperature is ≥ the first preset temperature difference value, increase the real-time flow rate; If 0 < the difference between the set outlet temperature and the real-time temperature < the first preset temperature difference value, maintain the current real-time flow rate; When the real-time flow rate = the first preset flow rate + (n-1) * preset flow rate difference, and the real-time flow rate is less than the second preset flow rate, let the dual-flow heating pump continue to run at the current real-time flow rate for a first buffer time; If the difference between the set outlet temperature and the real-time temperature is > 0, then continue to adjust the real-time flow rate according to the second preset adjustment method, where n is an integer greater than 1; When the real-time flow rate is ≥ (first preset flow rate + n * preset flow rate difference), if the difference between the set outlet temperature and the real-time temperature is < 2℃, then reduce the real-time flow rate to (the real-time flow rate = the first preset flow rate + (n-1) * preset flow rate difference), let the dual-flow heating pump continue to run at the current real-time flow rate for a first buffer time; If the difference between the set outlet temperature and the real-time temperature is > 0, then continue to adjust the real-time flow rate according to the second preset adjustment method, where n is an integer greater than 1; When the difference between the set outlet water temperature and the real-time temperature is ≤0, the compressor is turned off, and the real-time flow rate is adjusted according to the third preset adjustment method until the water pump is turned off; the third preset adjustment method includes the following steps: controlling the rate of change of the real-time flow rate to 0.8m 3 / h·s.

2. The control method for a dual-heat pump according to claim 1, characterized in that, The first preset adjustment method further includes the following steps: if the real-time flow rate is greater than the first preset flow rate or less than the first preset flow rate when the preset frequency increase time is reached, the dual-heat pump performs three fault determinations. If the results of the three fault determinations are all yes, the pump stops and issues a fault signal; the preset frequency increase time = first preset flow rate / real-time flow rate change rate; the fault determination method is: after the preset fault determination time has elapsed, if the real-time flow rate is greater than the first preset flow rate or less than the first preset flow rate, the fault determination result is yes.

3. The control method for a dual-heat pump according to claim 1, characterized in that, The second preset adjustment method further includes the following steps: when the real-time flow rate = the second preset flow rate, if the difference between the set outlet temperature and the real-time temperature is ≥ the first preset temperature difference value, the current real-time flow rate is maintained; if 0 < the difference between the set outlet temperature and the real-time temperature < the first preset temperature difference value, the real-time flow rate is reduced.

4. The control method for a dual-heat pump according to claim 1, characterized in that, The adjustment period of the first preset adjustment method is 60s to 90s, the adjustment period of the second preset adjustment method is 10s to 20s, and the adjustment period of the third preset adjustment method is 30s to 60s.

5. A control device for a dual-unit heat pump, characterized in that, The control method applicable to the dual-heat pump according to any one of claims 1-4 includes: The data acquisition module is used to acquire the real-time flow rate detected by the flow sensor, the real-time temperature detected by the temperature sensor, and the set outlet water temperature. The judgment module is used to determine whether the real-time flow rate is equal to the first preset flow rate and whether the difference between the set outlet water temperature and the real-time temperature is not greater than 0. The execution module is used to adjust the real-time flow rate according to the first preset adjustment method, and when the real-time flow rate = the first preset flow rate, the water pump is run for a first preset time; Used to adjust the real-time flow rate according to the difference between the set outlet water temperature and the real-time temperature, using a second preset adjustment method; When the difference between the set outlet water temperature and the real-time temperature is ≤0, the compressor is turned off, and the real-time flow rate is adjusted according to the third preset adjustment method until the water pump is turned off.

6. A computer device, characterized in that, include: At least one memory and at least one processor; The memory is used to store one or more computer programs, which, when executed by a processor, are used to implement the steps of the control method for a dual-heat pump as described in any one of claims 1-4. When the one or more computer programs are executed by the at least one processor, the at least one processor implements the steps of the control method for a dual-heat pump as described in any one of claims 1-4.

7. A storage medium containing computer-executable instructions, characterized in that, The computer-executable instructions, when executed by a computer processor, are used to perform the steps of the control method for a dual-heat pump as described in any one of claims 1-4.

Images