CN114294784A - Defrosting control method for heat pump unit and heat pump unit - Google Patents
Defrosting control method for heat pump unit and heat pump unit Download PDFInfo
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Abstract
The invention relates to a control method for preventing water flow loss from causing failure during defrosting of a heat pump unit. The heat pump unit comprises a shell, a compressor, a four-way valve, a water side heat exchanger, an air side heat exchanger, a water outlet temperature sensor, a low-pressure sensor and a refrigerant pipeline, wherein the compressor, the four-way valve, the water side heat exchanger, the air side heat exchanger, the water outlet temperature sensor and the low-pressure sensor are arranged in the shell; the water outlet temperature sensor is arranged at the water discharging end of the water side heat exchanger, and the low-pressure sensor is arranged at the air return end of the compressor; the method comprises the following steps: after entering a defrosting mode, acquiring the outlet water temperature through an outlet water temperature sensor, and acquiring a low-pressure value through a low-pressure sensor; and if the outlet water temperature is greater than or equal to the preset temperature threshold value, the outlet water temperature is not in a descending trend within the set first time range, and the low-pressure value is in a descending trend, exiting the defrosting mode. The method enhances the reliability of the unit operation and improves the safety of the unit during defrosting.
Description
Technical Field
The invention relates to the technical field of heat pump air conditioners, in particular to a defrosting control method for a heat pump unit and the heat pump unit.
Background
With the development of heat pump air conditioning technology and the enhancement of energy-saving and environment-friendly consciousness of people, more and more heat pump air conditioners adopting a water flow switch are adopted. The water flow switch is used for detecting the water flow in the heat pump air conditioner, when the water flow is detected to be lower than a set cutoff value, the water flow switch sends a cutoff signal to the heat pump air conditioner, the heat pump air conditioner stops running, and the heat pump air conditioner is prevented from running under the condition that the water flow is insufficient and damaging a unit.
However, the water flow switch has the following disadvantages: when the heat pump air conditioner is installed, if the flow gear of the circulating water pump does not meet the flow requirement of the unit, the water flow of the unit is easily caused to be lower than the cutoff value of the water flow switch, the error protection action of the unit is triggered, and the running reliability of the unit is reduced; meanwhile, the heat pump air conditioner stops running due to the fact that the circulating water pump works abnormally, water pipelines leak or air enters, a water flow switch is easy to damage or malfunction and the like. When defrosting is carried out under outdoor low-temperature working conditions, the heat pump unit stops running due to water flow loss, and a refrigerant pipeline, a water pipeline and other components are influenced by low temperature and are easy to freeze, so that the pipeline is frozen and blocked or the components are frozen and cracked, and the whole equipment is damaged. Therefore, it is necessary to develop a defrosting control method for preventing the heat pump air conditioner from being out of order due to the lack of water flow.
Disclosure of Invention
Based on this, the invention aims to provide a defrosting control method for a heat pump unit, which indirectly detects the water flow in the heat pump unit through the outlet water temperature and the low-pressure value, does not need to additionally arrange a water flow switch, avoids the defects of high failure rate of the water flow switch, easy triggering of error protection and the like, enhances the running reliability of the heat pump unit, and thus improves the safety of equipment in a defrosting mode.
The invention is realized by the following technical scheme:
a control method for preventing water flow loss from causing failure in defrosting of a heat pump unit comprises a shell, a compressor, a four-way valve, a water side heat exchanger, an air side heat exchanger, a water outlet temperature sensor, a low pressure sensor and a refrigerant pipeline, wherein the compressor, the four-way valve, the water side heat exchanger and the air side heat exchanger are arranged in the shell; the water outlet temperature sensor is arranged at the water discharging end of the water side heat exchanger, and the low-pressure sensor is arranged at the air return end of the compressor; the method comprises the following steps:
after entering a defrosting mode, acquiring the outlet water temperature through the outlet water temperature sensor, and acquiring a low-pressure value through the low-pressure sensor; and if the outlet water temperature is greater than or equal to a preset temperature threshold value and within a set first time range, the outlet water temperature is not in a descending trend, and the low-pressure value is in a descending trend, exiting the defrosting mode.
According to the defrosting control method for the heat pump unit, the water flow is indirectly detected by adopting the water outlet temperature and the low-pressure value, the accuracy of water flow detection is improved, the defects that a water flow switch is easy to trigger error protection, frequent failure or faults and the like are avoided, the condition that the unit freezes and is cracked due to failure caused by water flow loss during defrosting of the heat pump unit is favorably prevented, and the reliability of operation of the heat pump unit is enhanced.
Further, the method also comprises the following steps: and if the outlet water temperature is greater than or equal to the preset temperature threshold value and within the first time range, the outlet water temperature is not in a descending trend, and the low-pressure value is not in a descending trend, maintaining the defrosting mode.
Further, the method also comprises the following steps: and if the outlet water temperature is greater than or equal to the preset temperature threshold value and within the first time range, the outlet water temperature is in a descending trend, and the time that the low-pressure value is in the descending trend is not more than a set second time range, maintaining the defrosting mode.
Further, the method also comprises the following steps: and if the outlet water temperature is greater than or equal to the preset temperature threshold value and within the first time range, the outlet water temperature is in a descending trend, and the time that the low-pressure value is in the descending trend exceeds the second time range, exiting the defrosting mode.
Further, the method also comprises the following steps: and if the outlet water temperature is less than the preset temperature threshold, exiting the defrosting mode.
The invention also provides a heat pump unit, which comprises a shell, a compressor, a four-way valve, a water side heat exchanger, an air side heat exchanger, a controller, a water outlet temperature sensor, a low pressure sensor and a refrigerant pipeline, wherein the compressor, the four-way valve, the water side heat exchanger and the air side heat exchanger are arranged in the shell;
the controller is connected with the compressor, the four-way valve, the water outlet temperature sensor and the low-pressure sensor; the water outlet temperature sensor is arranged at the water discharging end of the water side heat exchanger and used for sending a water outlet temperature signal to the controller; the low-pressure sensor is arranged at the air return end of the compressor and used for sending a low-pressure value to the controller;
the controller is used for controlling the heat pump unit to exit from the defrosting mode when the outlet water temperature signal is greater than or equal to a preset temperature threshold value, the outlet water temperature signal is not in a descending trend within a set first time range, and the low-pressure value is in a descending trend.
Further, the controller is further configured to control the heat pump unit to maintain the defrosting mode when the outlet water temperature signal is greater than or equal to the preset temperature threshold value, and the outlet water temperature signal is not in a descending trend and the low-pressure value is not in a descending trend within the first time range in the defrosting mode.
Further, the controller is further configured to control the heat pump unit to maintain the defrosting mode when the water outlet temperature signal is greater than or equal to the preset temperature threshold value, the water outlet temperature signal is in a descending trend within the first time range, and the time that the low-pressure value is in the descending trend does not exceed a set second time range in the defrosting mode.
Further, the controller is further configured to control the heat pump unit to exit the defrosting mode when the water outlet temperature signal is greater than or equal to the preset temperature threshold value, the water outlet temperature signal is in a descending trend within the first time range, and the time that the low-pressure value is in the descending trend exceeds the second time range.
Further, the controller is further configured to control the heat pump unit to exit the defrosting mode when the water outlet temperature signal is smaller than the preset temperature threshold in the defrosting mode.
Compared with the heat pump unit adopting the water flow switch in the prior art, the defrosting control method of the heat pump unit and the heat pump unit provided by the invention have the advantages that the water flow in the heat pump unit is indirectly detected through the outlet water temperature and the low-pressure value, the accuracy of water flow detection is improved, the defects that the water flow switch has high failure rate, is easy to trigger error protection and the like are overcome, the operation reliability of the heat pump unit is enhanced, and the heat pump unit under the low-temperature working condition is effectively protected.
For a better understanding and practice, the invention is described in detail below with reference to the accompanying drawings.
Drawings
Fig. 1 is a piping structure diagram of a heat pump unit according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating steps of a defrosting control method for a heat pump unit according to an embodiment of the present invention.
Reference numerals: the system comprises a heat pump unit 20, a compressor 21, a four-way valve 22, a water side heat exchanger 23, an air side heat exchanger 24, an outlet water temperature sensor 25 and a low-pressure sensor 26.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
It should be understood that the embodiments described are only some embodiments of the present application, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the embodiments in the present application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the present application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the application, as detailed in the appended claims. In the description of the present application, it is to be understood that the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not necessarily used to describe a particular order or sequence, nor are they to be construed as indicating or implying relative importance. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
Further, in the description of the present application, "a plurality" means two or more unless otherwise specified. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
Please refer to fig. 1, which is a piping structure diagram of a heat pump unit according to this embodiment. The heat pump unit 20 includes a housing (not shown), a compressor 21, a four-way valve 22, a water-side heat exchanger 23, an air-side heat exchanger 24, a controller (not shown), an outlet water temperature sensor 25, a low-pressure sensor 26, an outdoor temperature and humidity sensor (not shown), and a refrigerant pipeline communicating the compressor 21, the four-way valve 22, the water-side heat exchanger 23, and the air-side heat exchanger 24.
The controller is connected with the compressor 21, the four-way valve 22, the outlet water temperature sensor 25, the low-pressure sensor 26 and the outdoor temperature and humidity sensor. The controller can be a control unit of the heat pump unit, namely a control unit for controlling the start-stop, mode switching and frequency control of the heat pump unit; the controller may also be a separate control module, which may be a control chip with a CPU, or an FPGA chip, an embedded chip, or the like.
The controller is used for controlling the heat pump unit 20 to enter, maintain or exit the defrosting mode.
The outdoor temperature and humidity sensor is used for acquiring the environment temperature and humidity of the heat pump unit 20 and sending the environment temperature and humidity to the controller. The controller is used for controlling the heat pump unit 20 to enter a defrosting mode when the environment temperature and humidity meet defrosting conditions. In the defrosting mode, the air-side heat exchanger 24 serves as a condenser, the water-side heat exchanger 23 serves as an evaporator, and the flow direction of the refrigerant is as follows: compressor 21, four-way valve 22, air-side heat exchanger 24, water-side heat exchanger 23, compressor 21. When the heat pump unit 20 exits the defrosting mode, the operation may be stopped or the heat pump unit may be switched to the heating mode, that is, the controller may close the compressor 21 or change the direction of the four-way valve 22 to cause the heat pump unit to exit the defrosting mode.
The outlet water temperature sensor 25 is arranged at the drainage end of the water side heat exchanger 23 and used for sending an outlet water temperature signal T to the controller; the outlet water temperature sensor 25 can communicate with the controller through wired transmission or wireless transmission, and the detection mode can be continuous sampling or sampling at certain time intervals. The low-pressure sensor 26 is arranged at the air return end of the compressor and used for sending a low-pressure value P to the controller; similarly, the low pressure sensor 26 may communicate with the controller by wired or wireless transmission, and the detection may be continuous or at regular intervals.
The controller is also used for leading the water outlet temperature signal T to be more than or equal to a preset temperature threshold value T in the defrosting mode0And within a set first time range tnAnd when the outlet water temperature signal T is not in a descending trend and the low-pressure value P is in a descending trend, controlling the heat pump unit 20 to exit the defrosting mode.
The controller is also used for leading the water outlet temperature signal T to be more than or equal to a preset temperature threshold value T in the defrosting mode0And in the first time range, when the outlet water temperature signal T is not in a descending trend and the low-pressure value P is not in a descending trend, controlling the heat pump unit 20 to maintain the defrosting mode.
The controller is also used for leading the water outlet temperature signal T to be more than or equal to a preset temperature threshold value T in the defrosting mode0And in the first time range, when the water outlet temperature signal T is in a descending trend, and the time that the low pressure value P is in the descending trend does not exceed the second time range, controlling the heat pump unit 20 to maintain the defrosting mode.
The controller is also used for leading the water outlet temperature signal T to be more than or equal to a preset temperature threshold value T in the defrosting mode0And in the first time range, when the water outlet temperature signal T is in a descending trend, and the time when the low pressure value P is in the descending trend exceeds the second time range, controlling the heat pump unit 20 to exit the defrosting mode.
The controller is also used for leading the water outlet temperature signal T to be smaller than a preset temperature threshold value T in the defrosting mode0And then, the heat pump unit 20 is controlled to exit the defrosting mode.
In the present invention, the descending trend refers to that the outlet water temperature signal T or the low pressure value P is in a state or trend of decreasing value as a whole within a certain time range, that is, the outlet water temperature signal T or the low pressure value P is gradually decreased within a certain time range as a whole.
In particular, the determination may be made by comparing the magnitude of two adjacent data points or calculating a slope, for example, over a first time range t1,tn]Internal miningCollect a series of water temperature signals T1,T2,T3,T4,T5… …, comparing the magnitude of two adjacent outlet water temperature signals, respectively, as long as most of the data points satisfy Tn-1<TnAnd T is1Is significantly less than TnNamely, the water temperature signal T is considered to be in a descending trend.
Similarly, in a first time range [ t ]1,tn]Internally, a series of low pressure values P are collected1,P2,P3,P4,P5… …, comparing the magnitude of two adjacent low pressure values, respectively, as long as most of the data points satisfy Pn-1<PnAnd P is1Is significantly less than PnI.e. the low pressure value P is considered to be in a downward trend.
Further, in a second time frame t1,tm]When the low-pressure value P is in [ t ]1,tm-1]Inner in a downward trend, at tmThen the pressure value P is not in a descending trend, and the time that the low-pressure value P is in the descending trend does not exceed tm(ii) a When the low pressure value P is in the second time range t1,tm-1]Inner in a downward trend, at tmThen the pressure value is still in the descending trend, and the time that the low-pressure value P is in the descending trend exceeds tm。
In this embodiment, after the heat pump unit 20 enters the defrosting mode, the controller receives the outlet water temperature signal T and the low pressure value P; the preset temperature threshold is T0＝15℃。
If T<T0The controller directly controls the heat pump unit to exit the defrosting mode at 15 ℃; if the water outlet temperature signal T is more than or equal to T0When the temperature is 15 ℃, the controller further judges the variation trend of the water temperature signal T and the low-pressure value P. Optionally, the controller may determine the variation trend of T and the variation trend of P at the same time, or determine the variation trend of T first and then determine the variation trend of P first. If at [ t1,tn]If the water outlet temperature signal T is not in a descending trend and the low-pressure value P is in a descending trend, the heat pump unit is controlled to exit the defrosting mode(ii) a If at [ t1,tn]If the outlet water temperature signal T and the low-pressure value P are not in a descending trend, controlling the heat pump unit to maintain a defrosting mode; if the water temperature signal T is in [ T ]1,tn]The time when the low-pressure value P is in the descending trend does not exceed tmControlling the heat pump unit to maintain the defrosting mode; if the water temperature signal T is in [ T ]1,tn]The time when the pressure value P is in the descending trend exceeds tmAnd controlling the heat pump unit to exit the defrosting mode. In the present embodiment, tn＝60s，tmThe sampling mode is continuous sampling, which is 61 s.
The principle that the heat pump unit 20 prevents failure caused by water flow loss in the defrosting process is as follows:
in the defrosting process, the water side heat exchanger 23 serves as an evaporator, and the low-temperature low-pressure liquid refrigerant evaporates and absorbs the low-temperature heat energy of the cold water at the water side heat exchanger 23. When the heat pump unit 20 is normally operated, the outlet water temperature of the water outlet end of the water side heat exchanger 23 should be greater than the preset temperature threshold value T0The low-pressure refrigerant at the return end of the compressor 21 can also maintain the same pressure level at 15 ℃.
The water flow in the water pipe is reduced, and the refrigerant and the water can not perform sufficient heat exchange, so that the low-temperature heat energy absorbed by the refrigerant is reduced. Because the volume of the refrigerant pipeline is fixed, the pressure of the refrigerant at the air return end of the compressor 21 is in direct proportion to the temperature, so that the low-temperature heat energy absorbed by the refrigerant is reduced, the temperature of the gaseous refrigerant is reduced, and the low-pressure value is reduced accordingly.
As a result, T.gtoreq.T0Under the condition of 15 ℃, if the outlet water temperature T is not in a descending trend, and the low-pressure value P is in a descending trend, the water flow in the water pipeline is reduced or not; if the outlet water temperature T is not in a descending trend, and the low-pressure value P is in a descending trend, the water flow in the water pipeline is normal; if the effluent temperature T is in a descending trend, the time that the low-pressure value P is in the descending trend does not exceed TmThe water flow in the water pipeline is normal; if the effluent temperature T is in a descending trend, the time that the low-pressure value P is in the descending trend exceeds TmIndicating a reduction or absence of water flow in the water line. At T<T0At 15 c, the water flow in the water line is too low and the ambient temperature is detected by the outlet temperature sensor 25.
The embodiment also provides a control method for preventing the failure caused by water flow loss during defrosting of the heat pump unit. Please refer to fig. 2, which is a flowchart illustrating a method for controlling defrosting of a heat pump unit according to an embodiment of the present invention. The control method comprises the following steps:
s1, entering a defrosting mode;
s2, acquiring an effluent temperature T through an effluent temperature sensor, and acquiring a low-pressure value P through a low-pressure sensor;
s3, mixing the water outlet temperature T with a preset temperature threshold value T0Comparing;
s4, judging the variation trend of the outlet water temperature T along with the time T, and judging the variation trend of the low-pressure value P along with the time T;
s5, maintaining the defrosting mode, and re-executing the step S2;
and S6, exiting the defrosting mode.
In step S3, if T ≧ T0Then go to step S4; if T<T0Then step S6 is executed.
In step S4, according to the trend of the outlet water temperature T and the low pressure value P, the method includes the following 4 sub-steps:
s41, if the effluent temperature T is not in a descending trend and the low-pressure value P is in a descending trend within the set first time range, executing a step S6;
s42, if the water outlet temperature T is not in a descending trend and the low-pressure value P is not in a descending trend within the first time range, executing a step S5;
s43, if the time is in the first time range t1The water outlet temperature T is in a descending trend, and the time that the low-pressure value P is in the descending trend does not exceed a second time range T2If yes, go to step S5;
s44, if the time is in the first time range t1The water outlet temperature T is in a descending trend and the low pressure value P isAt the time of the downward trend exceeding the second time range t2Then, step S6 is executed.
Compared with the heat pump unit adopting the water flow switch in the prior art, the defrosting control method of the heat pump unit and the heat pump unit provided by the invention have the advantages that the water flow in the heat pump unit is indirectly detected through the outlet water temperature and the low-pressure value, the accuracy of water flow detection is improved, the defects that the water flow switch has high failure rate, is easy to trigger error protection and the like are overcome, the running reliability of the heat pump unit is enhanced, and the safety of the heat pump unit in a defrosting mode is effectively improved.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (10)
1. A defrosting control method of a heat pump unit is characterized in that the heat pump unit comprises a shell, a compressor, a four-way valve, a water side heat exchanger, an air side heat exchanger, a water outlet temperature sensor and a low pressure sensor which are arranged in the shell, and a refrigerant pipeline which is communicated with the compressor, the four-way valve, the water side heat exchanger and the air side heat exchanger; the water outlet temperature sensor is arranged at the water discharging end of the water side heat exchanger, and the low-pressure sensor is arranged at the air return end of the compressor; the method comprises the following steps:
after entering a defrosting mode, acquiring the outlet water temperature through the outlet water temperature sensor, and acquiring a low-pressure value through the low-pressure sensor;
and if the outlet water temperature is greater than or equal to a preset temperature threshold value and within a set first time range, the outlet water temperature is not in a descending trend, and the low-pressure value is in a descending trend, exiting the defrosting mode.
2. The defrosting control method for the heat pump unit according to claim 1, further comprising the following steps:
and if the outlet water temperature is greater than or equal to the preset temperature threshold value and within the first time range, the outlet water temperature is not in a descending trend, and the low-pressure value is not in a descending trend, maintaining the defrosting mode.
3. The defrosting control method for the heat pump unit according to claim 1, further comprising the following steps:
and if the outlet water temperature is greater than or equal to the preset temperature threshold value and within the first time range, the outlet water temperature is in a descending trend, and the time that the low-pressure value is in the descending trend is not more than a set second time range, maintaining the defrosting mode.
4. The defrosting control method of the heat pump unit according to claim 3, characterized by further comprising the following steps:
and if the outlet water temperature is greater than or equal to the preset temperature threshold value and within the first time range, the outlet water temperature is in a descending trend, and the time that the low-pressure value is in the descending trend exceeds the second time range, exiting the defrosting mode.
5. The defrosting control method for the heat pump unit according to claim 1, further comprising the following steps:
and if the outlet water temperature is less than the preset temperature threshold, exiting the defrosting mode.
6. A heat pump unit, its characterized in that:
the system comprises a shell, a compressor, a four-way valve, a water side heat exchanger, an air side heat exchanger, a controller, a water outlet temperature sensor and a low pressure sensor which are arranged in the shell, and a refrigerant pipeline for communicating the compressor, the four-way valve, the water side heat exchanger and the air side heat exchanger;
the controller is connected with the compressor, the four-way valve, the water outlet temperature sensor and the low-pressure sensor; the water outlet temperature sensor is arranged at the water discharging end of the water side heat exchanger and used for sending a water outlet temperature signal to the controller; the low-pressure sensor is arranged at the air return end of the compressor and used for sending a low-pressure value to the controller;
the controller is used for controlling the heat pump unit to exit from the defrosting mode when the outlet water temperature signal is greater than or equal to a preset temperature threshold value, the outlet water temperature signal is not in a descending trend within a set first time range, and the low-pressure value is in a descending trend.
7. A heat pump unit according to claim 6, characterised in that:
the controller is further configured to control the heat pump unit to maintain the defrosting mode when the outlet water temperature signal is greater than or equal to the preset temperature threshold value, and the outlet water temperature signal is not in a descending trend and the low-pressure value is not in a descending trend within the first time range in the defrosting mode.
8. A heat pump unit according to claim 7, characterised in that:
the controller is further configured to control the heat pump unit to maintain the defrosting mode when the water outlet temperature signal is greater than or equal to the preset temperature threshold value in the defrosting mode, the water outlet temperature signal is in a descending trend within the first time range, and the time that the low-pressure value is in the descending trend does not exceed a set second time range.
9. A heat pump unit according to claim 8, characterised in that:
the controller is further configured to control the heat pump unit to exit the defrosting mode when the water outlet temperature signal is greater than or equal to the preset temperature threshold value, the water outlet temperature signal is in a descending trend within the first time range, and the time that the low-pressure value is in the descending trend exceeds the second time range.
10. A heat pump unit according to claim 7, characterised in that:
the controller is further used for controlling the heat pump unit to exit the defrosting mode when the outlet water temperature signal is smaller than the preset temperature threshold value in the defrosting mode.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115095994A (en) * | 2022-07-07 | 2022-09-23 | 中山市爱美泰电器有限公司 | Operation control method of heat pump unit, heat pump unit and storage medium |
| CN115507563A (en) * | 2022-11-24 | 2022-12-23 | 广东美格动力新能源有限公司 | Defrosting control method for variable-frequency heat pump unit and variable-frequency heat pump unit |
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| CN115095994B (en) * | 2022-07-07 | 2024-03-12 | 中山市爱美泰电器有限公司 | Operation control method of heat pump unit, heat pump unit and storage medium |
| CN115507563A (en) * | 2022-11-24 | 2022-12-23 | 广东美格动力新能源有限公司 | Defrosting control method for variable-frequency heat pump unit and variable-frequency heat pump unit |
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