CN115507563A - Defrosting control method for variable-frequency heat pump unit and variable-frequency heat pump unit - Google Patents
Defrosting control method for variable-frequency heat pump unit and variable-frequency heat pump unit Download PDFInfo
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- CN115507563A CN115507563A CN202211478634.9A CN202211478634A CN115507563A CN 115507563 A CN115507563 A CN 115507563A CN 202211478634 A CN202211478634 A CN 202211478634A CN 115507563 A CN115507563 A CN 115507563A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
- F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Air Conditioning Control Device (AREA)
Abstract
The invention relates to the technical field of defrosting of variable frequency heat pump units, and provides a defrosting control method of a variable frequency heat pump unit and the variable frequency heat pump unit. The control method comprises the following steps: acquiring the initial frequency of a variable frequency compressor according to the initial outlet water temperature of a condenser when the variable frequency heat pump unit defrosts and the corresponding maximum target phase current value; obtaining the operation frequency of the variable frequency compressor during defrosting based on the ambient temperature of the variable frequency heat pump unit and the variation trend of the ambient temperature; adjusting the operation frequency according to the actual outlet water temperature of the condenser when the variable frequency heat pump unit performs defrosting and the maximum target phase current value of the corresponding variable frequency compressor; reducing the operation frequency under the condition that the actual phase current value of the variable frequency compressor is greater than or equal to the phase current maximum value corresponding to the upper limit of the pressure protection value; and the defrosting is quitted until the variable frequency heat pump unit meets the defrosting quitting condition. The control on the operating frequency of the variable frequency compressor is timely, accurate and less prone to the situation of overhigh high pressure.
Description
Technical Field
The invention relates to the technical field of defrosting of variable frequency heat pump units, in particular to a defrosting control method of a variable frequency heat pump unit and the variable frequency heat pump unit.
Background
The variable frequency heat pump unit is a common heat exchange device and is widely applied to refrigeration and/or heating of businesses, industries and residences.
In the heating process of the variable frequency heat pump unit, the evaporator of the variable frequency heat pump unit frosts due to the external low temperature environment, and then the air outlet temperature and the heating capacity of the condenser of the variable frequency heat pump unit are reduced, so that the variable frequency heat pump unit needs to be defrosted periodically.
Currently, control of defrost is typically by controlling the timing of the exit from defrost, either by a timed period (e.g., the actual time of defrost is greater than a preset maximum time of defrost) and/or based on sensed parameters (e.g., the temperature of the coil inlet is greater than a preset temperature, and/or the temperature of the defrost hot water is less than a preset minimum temperature, and/or high pressure protection is triggered). However, when the defrosting operation is stopped in actual operation, the high-pressure of the variable-frequency compressor is too high and even exceeds the high-pressure switch protection value, so that the variable-frequency heat pump unit frequently triggers a protection mechanism, and even the variable-frequency heat pump unit is damaged.
Disclosure of Invention
In order to solve at least one technical problem in the prior art in the aspects of the invention and the other aspects, the invention provides a defrosting control method for a variable frequency heat pump unit and the variable frequency heat pump unit.
The embodiment of the invention provides a defrosting control method for a variable-frequency heat pump unit, which comprises the following steps: under the condition that the variable-frequency heat pump unit meets defrosting conditions, acquiring the initial frequency of a variable-frequency compressor of the variable-frequency heat pump unit corresponding to the initial outlet water temperature according to the initial outlet water temperature of a condenser of the variable-frequency heat pump unit; correcting the initial frequency based on the environmental temperature of the environment where the variable frequency heat pump unit is located and the variation trend of the environmental temperature to obtain the operation frequency of the variable frequency compressor during defrosting; adjusting the operation frequency according to the actual outlet water temperature of a condenser of the variable frequency heat pump unit and the maximum target phase current value of the variable frequency compressor corresponding to the actual outlet water temperature; reducing the operating frequency of the inverter compressor under the condition that the actual phase current value of the inverter compressor is greater than or equal to the phase current maximum value corresponding to the upper limit of the pressure protection value of the inverter heat pump unit; and controlling the variable frequency heat pump unit to exit the defrosting state until the variable frequency heat pump unit meets the condition of exiting defrosting.
According to an embodiment of the present invention, the obtaining an initial frequency of an inverter compressor of the inverter heat pump unit corresponding to an initial outlet water temperature of a condenser of the inverter heat pump unit according to the initial outlet water temperature when the inverter heat pump unit satisfies a defrosting condition includes: establishing a mapping table by taking the outlet water temperature of a condenser of the variable-frequency heat pump unit as a first variable, taking the target phase current value of the variable-frequency compressor corresponding to the outlet water temperature as a second variable and taking the operating frequency of the variable-frequency compressor as a dependent variable; and detecting the initial outlet water temperature of a condenser of the variable-frequency heat pump unit, acquiring the maximum target phase current value corresponding to the initial outlet water temperature in the mapping table in a table look-up mode, and taking the running frequency corresponding to the maximum target phase current value as the initial frequency.
According to an embodiment of the present invention, the establishing a first variable and a second variable of a mapping table by using the outlet water temperature of the condenser of the variable frequency heat pump unit as a first variable, the target phase current value of the variable frequency compressor corresponding to the outlet water temperature as a second variable, and the operating frequency of the variable frequency compressor as a dependent variable includes: taking the outlet water temperature of a condenser of the variable-frequency heat pump unit as a first variable, taking the target phase current value of the variable-frequency compressor corresponding to the outlet water temperature as a second variable, and acquiring the theoretical phase current value of the variable-frequency compressor corresponding to the first variable and the second variable; acquiring a phase current maximum value of the variable-frequency compressor corresponding to the first variable based on the upper limit of the pressure protection value of the variable-frequency heat pump unit; and selecting the theoretical phase current value based on the phase current maximum value, acquiring a target phase current value, and establishing a mapping table comprising a plurality of groups of the target phase current values.
According to an embodiment of the present invention, the selecting the theoretical phase current value based on the phase current maximum value and obtaining a target phase current value includes: comparing the theoretical phase current value and the phase current maximum value based on the same first variable and second variable; the theoretical phase current value is smaller than the maximum value of the phase current, and the theoretical phase current value is used as the target phase current value; the theoretical phase current value is equal to or greater than the phase current maximum value, and the phase current maximum value is set as the target phase current value.
According to an embodiment of the present invention, the correcting the initial frequency based on the ambient temperature of the environment where the inverter heat pump unit is located and the trend of the ambient temperature to obtain the operating frequency of the inverter compressor during defrosting includes: establishing a ladder diagram comprising a plurality of correction frequencies based on the environment temperature of the environment where the variable frequency heat pump unit is located and the change trend of the environment temperature; selecting a correction frequency corresponding to the environmental temperature of the environment where the variable-frequency heat pump unit is located and the variation trend of the environmental temperature; and taking the sum of the initial frequency and the correction frequency as the operating frequency of the inverter compressor during defrosting.
According to an embodiment of the present invention, the adjusting the operating frequency according to an actual outlet water temperature of a condenser of the variable frequency heat pump unit and a maximum target phase current value of the variable frequency compressor corresponding to the actual outlet water temperature includes: and detecting the outlet water temperature of a condenser of the variable-frequency heat pump unit, acquiring the operating frequency corresponding to the outlet water temperature in the mapping table in a table look-up mode, and operating the variable-frequency compressor by taking the sum of the operating frequency corresponding to the maximum target phase current value and the corrected frequency as a new operating frequency of the variable-frequency compressor.
According to an embodiment of the present invention, in a case where an actual phase current value of the inverter compressor is greater than or equal to a phase current maximum value corresponding to an upper limit of a pressure protection value of the inverter heat pump unit, the reducing the operating frequency of the inverter compressor includes: detecting the actual phase current value of the inverter compressor and comparing the actual phase current value with the maximum value of the phase current; and gradually reducing the operating frequency of the inverter compressor by using a preset frequency variable according to a preset period until the actual phase current value is greater than or equal to the maximum phase current value.
According to an embodiment of the present invention, the controlling the variable frequency heat pump unit to exit the defrosting state until the variable frequency heat pump unit satisfies the exit defrosting condition includes: the operating frequency of the variable frequency compressor is less than a preset frequency value; or the inlet temperature of the coil of the variable frequency heat pump unit is higher than the preset coil temperature; or the defrosting duration time of the variable frequency heat pump unit is longer than the preset duration time.
The embodiment of the invention also provides a variable frequency heat pump unit suitable for adopting the defrosting control method, which comprises the following steps: the execution part comprises a condenser, a variable frequency compressor and an evaporator which are communicated in sequence, and a heat exchange medium forms circulation in the execution part; the control part is in communication connection with the inverter compressor and is suitable for adjusting the operating frequency of the inverter compressor; the detection portion is connected with the control portion in a communication mode and comprises: the water supply and return temperature detection assembly is used for acquiring the water outlet temperature and the return temperature of the condenser; the environment temperature detection assembly is used for acquiring environment temperature; the phase current detection component is used for acquiring the phase current value of the control part; and the coil temperature detection assembly is used for acquiring the temperature of the coil of the evaporator.
According to the embodiment of the invention, the variable frequency heat pump unit further comprises: and the storage part is in communication connection with the control part and is used for setting parameters and/or timing for the control part.
According to the defrosting control method of the variable frequency heat pump unit and the variable frequency heat pump unit provided by the invention, the operating frequency of the variable frequency compressor during defrosting is obtained based on the external environment temperature, the variation trend of the environment temperature and the initial outlet water temperature, and the operating frequency of the variable frequency heat pump unit is adjusted based on the relation between the actual phase current value of the variable frequency compressor in the actual operating process and the phase current maximum value corresponding to the upper limit of the pressure protection value of the variable frequency heat pump unit, so that the operating frequency of the variable frequency compressor is controlled timely and accurately, and the condition that the high pressure of the variable frequency compressor is overhigh is caused to the minimum extent.
Drawings
FIG. 1 is a flow chart of a method for controlling defrosting of an inverter heat pump unit according to an exemplary embodiment of the present invention;
FIG. 2 is a ladder diagram of correction frequencies in accordance with an exemplary embodiment of the present invention;
FIG. 3 is a block diagram of an inverter heat pump unit according to an exemplary embodiment of the present invention;
FIG. 4 is a piping diagram of an execution unit of the variable frequency heat pump unit according to an exemplary embodiment of the present invention.
In the drawings, the reference numerals are as follows:
1. an execution unit;
11. a variable frequency compressor;
12. a condenser;
13. an evaporator;
14. a pipeline and a valve assembly;
2. a control unit;
21. a control module;
22. a frequency conversion module;
3. a detection unit;
31. a water supply and return temperature detection assembly;
32. an ambient temperature detection component;
33. a coil temperature detection assembly;
34. a compressor pressure detection assembly;
35. a phase current detection component;
4. a storage unit;
5. and (4) a manual operator.
Detailed Description
In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The terms "comprises," "comprising," and the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.
All terms, including technical and scientific terms, used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It is noted that the terms used herein should be interpreted as having a meaning that is consistent with the context of this specification and should not be interpreted in an idealized or overly formal sense.
Where a convention analogous to "at least one of A, B, and C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention, e.g., "a system having at least one of A, B, and C" would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc. Where a convention analogous to "at least one of A, B, or C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention, e.g., "a system having at least one of A, B, or C" would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.
The variable frequency heat pump unit is a common heat exchange device, and in the heating process of the variable frequency heat pump unit, the evaporator of the variable frequency heat pump unit is frosted due to the external low temperature environment, so that the air outlet temperature and the heating capacity of the condenser of the variable frequency heat pump unit are reduced, and therefore the variable frequency heat pump unit needs to be periodically defrosted.
Currently, control of defrost is typically by controlling the timing of the exit from defrost, either by a timed period (e.g., the actual time of defrost is greater than a preset maximum time of defrost) and/or based on sensed parameters (e.g., the temperature of the coil inlet is greater than a preset temperature, and/or the temperature of the defrost hot water is less than a preset minimum temperature, and/or high pressure protection is triggered).
Research shows that when the variable-frequency heat pump unit carries out defrosting, a fan of the variable-frequency heat pump unit arranged outdoors stops running and the return water temperature is increased, so that the pressure of a variable-frequency compressor of the variable-frequency heat pump unit is increased when defrosting is nearly completed. The frequency conversion compressor needs a certain time from the operation frequency in the defrosting state to the frequency reduction of the operation frequency in the defrosting quit state, and during the period, the high pressure of the frequency conversion compressor is still in a continuous rising state, so that the high pressure exceeds a high pressure protection value, a protection mechanism of the frequency conversion heat pump unit is triggered, and then the frequency conversion heat pump unit is stopped. Moreover, the temperature acquired by the defrosting temperature sensor arranged at present has hysteresis and nonuniformity, so that the defrosting control of the variable-frequency heat pump unit is not timely enough, and the situation that the high-pressure exceeds the high-pressure protection value can be caused frequently.
In view of this, embodiments of the present invention provide a defrosting control method for an inverter heat pump unit and an inverter heat pump unit.
FIG. 1 is a flowchart of a defrosting control method for an inverter heat pump unit according to an exemplary embodiment of the present invention.
The invention provides a defrosting control method for a variable frequency heat pump unit, as shown in figure 1, the control method comprises the following steps: step S110 to step S150.
Step S110: and under the condition that the variable frequency heat pump unit meets the defrosting condition, acquiring the initial frequency of a variable frequency compressor of the variable frequency heat pump unit corresponding to the initial outlet water temperature according to the initial outlet water temperature of a condenser of the variable frequency heat pump unit and the maximum target phase current value corresponding to the initial outlet water temperature.
Step S120: and correcting the initial frequency based on the ambient temperature of the environment where the variable frequency heat pump unit is located and the variation trend of the ambient temperature to obtain the operating frequency of the variable frequency compressor during defrosting.
Step S130: and adjusting the operation frequency according to the actual outlet water temperature of a condenser of the variable frequency heat pump unit and the maximum target phase current value of the variable frequency compressor corresponding to the actual outlet water temperature.
Step S140: and under the condition that the actual phase current value of the variable frequency compressor is greater than or equal to the phase current maximum value corresponding to the upper limit of the pressure protection value of the variable frequency heat pump unit, reducing the operating frequency of the variable frequency compressor.
Step S150: and controlling the variable frequency heat pump unit to exit the defrosting state until the variable frequency heat pump unit meets the condition of exiting defrosting.
In an exemplary embodiment, the defrosting condition in step S110 includes, but is not limited to, when the heating operation time of the variable frequency heat pump unit is greater than a preset maximum heating operation time or the inlet temperature of the coil is less than a preset defrosting temperature value.
In an exemplary embodiment, the mapping relationship may be established in advance based on the outlet water temperature of the condenser of the variable frequency heat pump unit, the operating frequency of the variable frequency compressor, and the target phase current value of the variable frequency compressor. The method comprises the steps of obtaining the operation frequency of the variable frequency compressor during defrosting based on the external environment temperature, the change trend of the environment temperature and the initial outlet water temperature, and adjusting the operation frequency of the variable frequency heat pump unit based on the relation between the actual phase current value of the variable frequency compressor in the actual operation process and the phase current maximum value corresponding to the upper limit of the pressure protection value of the variable frequency heat pump unit. Therefore, in the defrosting process, the running frequency of the variable frequency compressor is adjusted in real time based on the outlet water temperature of the condenser. Based on the mapping relation between the operating frequency of the variable frequency compressor and the target phase current value, after the phase current maximum value corresponding to the upper limit of the pressure protection value of the variable frequency heat pump unit is reached or exceeded for the first time in the defrosting process, the operating frequency of the variable frequency compressor is gradually reduced, so that the situation that the high pressure of the variable frequency compressor is too high is reduced as little as possible. In addition, because the defrosting temperature does not need to be directly measured, the hysteresis quality of the control process is avoided, and the control on the operating frequency of the variable frequency compressor is more timely and accurate.
According to an embodiment of the present invention, as shown in fig. 1, step S110: under the condition that variable frequency heat pump unit satisfies the defrosting condition, according to the initial leaving water temperature of the condenser of variable frequency heat pump unit and the biggest target phase current value corresponding to the initial leaving water temperature, the initial frequency of obtaining the variable frequency compressor of the variable frequency heat pump unit corresponding to the initial leaving water temperature includes: step S111 to step S112.
Step S111: and establishing a mapping table by taking the outlet water temperature of a condenser of the variable-frequency heat pump unit as a first variable, taking the target phase current value of the variable-frequency compressor corresponding to the outlet water temperature as a second variable and taking the operating frequency of the variable-frequency compressor as a dependent variable.
Step S112: detecting the initial outlet water temperature of a condenser of the variable-frequency heat pump unit, acquiring the maximum target phase current value corresponding to the initial outlet water temperature in the mapping table in a table look-up mode, and taking the running frequency corresponding to the maximum target phase current value as the initial frequency.
In an exemplary embodiment, the mapping table in step S111 may be established by using data obtained by the frequency conversion module.
In detail, a variable frequency heat pump unit with a known model is used as a prototype, and the whole machine defrosting operation experiment is carried out on the prototype.
Furthermore, the defrosting operation experiment includes that the outlet water temperature of the condenser is used as a first variable (independent variable), the target phase current value of the variable frequency compressor corresponding to the outlet water temperature is used as a second variable (actual value measured in the experiment), and the operation frequency of the variable frequency compressor corresponding to the first variable and the second variable is used as a dependent variable to obtain multiple groups of data.
According to the embodiment of the present invention, the step S111 of establishing a mapping table with the outlet water temperature of the condenser of the variable frequency heat pump unit as a first variable, the target phase current value of the variable frequency compressor corresponding to the outlet water temperature as a second variable, and the operating frequency of the variable frequency compressor as a dependent variable includes: step S1111 to step S1113.
Step S1111: and taking the outlet water temperature of a condenser of the variable-frequency heat pump unit as a first variable and the target phase current value of the variable-frequency compressor corresponding to the outlet water temperature as a second variable, and acquiring the theoretical phase current value of the variable-frequency compressor corresponding to the first variable and the second variable.
Step S1112: and acquiring the phase current maximum value of the variable frequency compressor based on the upper limit of the pressure protection value of the variable frequency heat pump unit.
Step S1113: and selecting a theoretical phase current value based on the phase current maximum value, acquiring a target phase current value, and establishing a mapping table comprising a plurality of groups of target phase current values.
According to an embodiment of the present invention, step S1113: selecting a theoretical phase current value based on the phase current maximum value and acquiring a target phase current value comprises the following steps: step S11131 to step S11133.
Step S11131: and comparing the theoretical phase current value and the maximum value of the phase current based on the same first variable and second variable.
Step S11132: and the theoretical phase current value is smaller than the maximum value of the phase current, and the theoretical phase current value is used as the target phase current value.
Step S11133: and the theoretical phase current value is greater than or equal to the maximum phase current value, and the maximum phase current value is taken as the target phase current value.
In an exemplary embodiment, in step S11131, the maximum value of the phase current of the inverter compressor corresponding to the outlet water temperature of 15 degrees celsius (c) is 27 amperes (a), where the outlet water temperature is 15 degrees celsius (c).
Further, in step S11132, in a state where the operation frequency of the inverter compressor is less than 76 hertz (Hz) (e.g., 74 hertz (Hz)), the theoretical phase current value (26.8 amperes (a)) of the inverter compressor is less than the phase current maximum value (27 amperes (a)), and thus the theoretical phase current value (26.8 amperes (a)) is taken as the target phase current value.
Further, in step S11133, in a state where the operation frequency of the inverter compressor is greater than or equal to 76 hertz (Hz), the theoretical phase current value (27 amperes (a)) of the inverter compressor is greater than or equal to the phase current maximum value (27 amperes (a)), and thus, the phase current maximum value (27 amperes (a)) is taken as the target phase current value.
Based on the sets of data acquired in steps S1112 to S1113, the outlet water temperature-phase current-operating frequency mapping table of table 1 below is prepared.
The columns in the table 1 are characterized by the outlet water temperature (unit: DEG C) of the condenser, the rows in the table 1 are characterized by the operating frequency (unit: hz) of the variable frequency compressor, and the intersection positions of the rows and the columns are characterized by the target phase current value of the variable frequency compressor.
In such an embodiment, the initial frequency of the inverter compressor is obtained based on the initial leaving water temperature of the condenser, and since the initial frequency is the operating frequency at which the inverter compressor is closest to the maximum value of the phase current, the inverter compressor can be operated at a higher operating frequency without exceeding the high pressure. Therefore, the defrosting speed is high, the time required by defrosting is short, and the defrosting of the fins is fast and clean.
Fig. 2 is a ladder diagram of correction frequencies in accordance with an exemplary embodiment of the present invention.
According to an embodiment of the present invention, as shown in fig. 1 and 2, step S120: revise the initial frequency based on the ambient temperature of the environment that frequency conversion heat pump set belongs to and ambient temperature's trend of change, the operating frequency when obtaining the frequency conversion compressor defrosting includes: step S121 to step S123.
Step S121: a ladder diagram comprising a plurality of correction frequencies is established based on the ambient temperature of the environment where the variable frequency heat pump unit is located and the variation trend of the ambient temperature.
Step S122: and selecting a correction frequency corresponding to the ambient temperature of the environment where the variable frequency heat pump unit is located and the variation trend of the ambient temperature.
Step S123: and taking the sum of the initial frequency and the correction frequency as the operation frequency of the inverter compressor during defrosting.
In an exemplary embodiment, as shown in FIG. 2, a ladder diagram is set based on historical data (including, but not limited to, temperature data of the set area of the variable frequency heat pump unit, such as the temperature of the indoor or outdoor space to be heat exchanged) and/or empirical data (including, but not limited to, upper and lower temperature limits and nodes for adjusting the correction frequency). In detail, in fig. 2, the values located on both sides of the gradient line are represented as temperature values, the value located in the middle of the gradient line is represented as correction frequency, the arrow located on the left side of the gradient map is represented as an upward trend, and the arrow located on the right side of the gradient map is represented as a downward trend.
Referring to fig. 2, for example, the upper limit of the ambient temperature on the left side is set to 15 ℃ (celsius degrees), under which frost formation is less likely to occur due to a high external temperature environment; the lower limit of the ambient temperature on the left side is set to-15 deg.c, under which most of the water vapor in the environment has been frozen into ice since the ambient temperature is much lower than the freezing point of water (0 deg.c), and the humidity in the environment is low (e.g., 20% to 30%), and thus, frosting is not easily formed.
After the upper limit and the lower limit of the left-side environment temperature are selected, a plurality of temperature values are selected in the interval between the upper limit and the lower limit of the temperature environment to serve as temperature nodes corresponding to the correction frequency.
Setting the upper limit and the lower limit of the correction frequency based on the upper limit and the lower limit of the temperature environment on the left side, and setting the correction frequency corresponding to the upper limit of the environmental temperature to be a negative value (shown as-4 Hz in FIG. 2) because frosting is not easily formed under the condition of the upper limit of the environmental temperature; on the other hand, although frost formation is not likely to occur even under the condition of the lower limit of the ambient temperature, since the ambient temperature is low at this time, the operating frequency of the inverter compressor should be increased, and therefore, the correction frequency corresponding to the lower limit of the ambient temperature is set to a positive value (10 hertz (Hz) as shown in fig. 2). After the correction frequencies of the two poles are set, the corresponding correction frequency is set according to each temperature node to match the opposite pole of the variable frequency compressor, so that each correction frequency is set to be a multiple of 2.
Further, the upper limit temperature on the right side is set to 12 ℃ (centigrade), in order to match the upper limit temperature on the left side (15 ℃ (centigrade)), the lower limit temperature on the right side is set to-18 ℃ (centigrade), in order to match the lower limit temperature on the left side (15 ℃ (centigrade)), so that the upper limit temperature and the lower limit temperature on the right side and the upper limit temperature and the lower limit temperature on the left side form a temperature difference, thereby preventing frequent adjustment of the correction frequency due to frequent change of the environmental temperature in the vicinity of the upper limit or the lower limit. Similarly, the upper limit and the lower limit of the left-side ambient temperature and the upper limit and the lower limit of the right-side ambient temperature are based on the temperature variation trend as a condition for acquiring the correction frequency, so as to prevent the correction frequency from being frequently adjusted due to frequent variation of the ambient temperature in the vicinity of a certain temperature node. Therefore, the jump of the correction frequency can be effectively prevented, and the stable operation of the variable frequency heat pump unit is facilitated. In an exemplary embodiment, the temperature values to the left or right of the gradient line are selected based on the trend of the ambient temperature.
Furthermore, according to the actual value of the ambient temperature, the value corresponding to the gradient line located below in the two adjacent gradient lines containing the actual value is used as the correction frequency.
For example, the ambient temperature is in an upward trend, and the true value of the ambient temperature is-8 degrees celsius (° c), as shown in fig. 2, the correction frequency F1=6 hertz (Hz).
As another example, the ambient temperature is in a downward trend, and the true value of the ambient temperature is-12 degrees celsius (° c), as shown in fig. 2, the correction frequency F1=6 hertz (Hz).
According to an embodiment of the present invention, as shown in fig. 1, step S130: adjusting the operation frequency according to the actual outlet water temperature of a condenser of the variable frequency heat pump unit and the maximum target phase current value of the variable frequency compressor corresponding to the actual outlet water temperature, wherein the operation frequency comprises detecting the outlet water temperature of the condenser of the variable frequency heat pump unit, acquiring the operation frequency corresponding to the outlet water temperature in a mapping table in a table look-up mode, and taking the sum of the operation frequency corresponding to the maximum target phase current value and the correction frequency as the new operation frequency of the variable frequency compressor to operate.
In an exemplary embodiment, the ambient temperature is in a downward trend, and the true value of the ambient temperature is-12 degrees Celsius (C.), and the initial outlet water temperature of the condenser of the variable frequency heat pump unit is 45 degrees Celsius (C.).
In detail, step S110: under the condition that the variable frequency heat pump unit meets the defrosting condition, the initial frequency (F2) of the variable frequency compressor of the variable frequency heat pump unit corresponding to the initial outlet water temperature is obtained through the lookup table 1 in the initial frequency of the variable frequency compressor of the variable frequency heat pump unit according to the initial outlet water temperature of the condenser of the variable frequency heat pump unit, and the initial frequency is 54 hertz (Hz).
Further, step S120: correcting the initial frequency based on the ambient temperature of the environment where the variable frequency heat pump unit is located and the variation trend of the ambient temperature, and acquiring the correction frequency (F1) of the variable frequency compressor to be 6 hertz (Hz) through a graph 2 in the operation frequency of the variable frequency compressor during defrosting.
Further, the operation frequency of the inverter compressor is F1+ F2=60 hertz (Hz).
In one illustrative embodiment, during defrost, the initial leaving water temperature of the condenser becomes in the 44 degree Celsius (. Degree. C.) scenario.
In detail, step S130: adjusting the operation frequency according to the actual outlet water temperature of a condenser of the variable-frequency heat pump unit and the maximum target phase current value of the variable-frequency compressor corresponding to the actual outlet water temperature, wherein the operation frequency comprises detecting the outlet water temperature of the condenser of the variable-frequency heat pump unit, acquiring the operation frequency corresponding to the outlet water temperature in a mapping table in a table look-up mode, taking the sum of the operation frequency corresponding to the maximum target phase current value and the correction frequency as the new operation frequency of the variable-frequency compressor in operation, and acquiring the operation frequency of the variable-frequency compressor corresponding to 44 degrees centigrade (DEG C) as 56 hertz (Hz) through a lookup table 1.
Further, the new operating frequency of the inverter compressor is F1+ F2=62 hertz (Hz).
In such an embodiment, the temperature of the external environment and the tendency of temperature change affect defrosting of the variable frequency heat pump unit. Therefore, the temperature of the external environment and the trend of the temperature change are used as factors influencing defrosting, the running frequency of the variable frequency compressor is compensated, the defrosting effect can be improved, and the variable frequency compressor is effectively controlled to prevent the high-pressure change of the variable frequency compressor caused by the temperature of the external environment from exceeding the upper limit of the pressure protection value.
According to an embodiment of the present invention, as shown in fig. 1, step S140: under the circumstances that the actual phase current value of inverter compressor is greater than or equal to, the phase current maximum that corresponds with the pressure protection value upper limit of inverter heat pump set, reduce inverter compressor's operating frequency includes: step S141 to step S142.
Step S141: and detecting the actual phase current value of the inverter compressor and comparing the actual phase current value with the maximum value of the phase current.
Step S142: and gradually reducing the operating frequency of the inverter compressor by a preset frequency variable according to a preset period until the actual phase current value is greater than or equal to the maximum phase current value.
In an exemplary embodiment, in step S141, an actual phase current value of the inverter compressor is periodically detected.
In detail, the period of detection includes, but is not limited to, one detection in 2 seconds (S).
In an exemplary embodiment, the predetermined period in step S142 includes, but is not limited to, 2 seconds (S).
Further, the preset frequency variable includes, but is not limited to, -2 hertz (Hz). It should be understood that embodiments of the invention are not limited thereto.
For example, the preset period includes, but is not limited to, 1 second (S), 3 seconds (S), 4 seconds (S), and other time periods.
As another example, the predetermined frequency variables include, but are not limited to, -1 Hertz (Hz), -3 Hertz (Hz), -4 Hertz (Hz), and other frequency variables.
Furthermore, the specific preset period and the preset frequency variable are suitable for the variable frequency heat pump unit, and the running frequency after frequency reduction is preferably less than or equal to the maximum value of the phase current.
In such an embodiment, by periodically detecting the actual phase current value of the inverter compressor, it can be determined in real time whether the inverter compressor exceeds the compressor phase current value corresponding to the upper limit value of the high-pressure during the operation process. If the current value of the compressor phase corresponding to the upper limit value of the high pressure is exceeded, the periodic frequency reduction is started, so that the actual phase current value corresponding to the new operation frequency does not exceed the maximum value of the current, and the inverter compressor can be operated at the operation frequency close to the high pressure in the state that the current value does not exceed the high pressure. Therefore, the defrosting safety is ensured, and the defrosting effect of the variable frequency compressor is maintained.
According to an embodiment of the present invention, as shown in fig. 1, step S150: until the variable frequency heat pump unit meets the condition of quitting defrosting, controlling the variable frequency heat pump unit to quit the defrosting state comprises the following steps: step S151 to step S153.
Step S151: and the operating frequency of the variable-frequency compressor is less than a preset frequency value.
Step S152: the inlet temperature of the coil pipe of the variable frequency heat pump unit is greater than the preset temperature of the coil pipe.
Step S153: the defrosting duration time of the variable frequency heat pump unit is longer than the preset duration time.
If at least one of step S151, step S152, and step S153 is satisfied, it is determined that the defrosting exit condition is satisfied.
In an exemplary embodiment, the predetermined frequency value in step S151 includes, but is not limited to, 24 hertz (Hz). It should be understood that embodiments of the invention are not limited thereto.
For example, the predetermined frequency values include, but are not limited to, 20 hertz (Hz), 22 Hz, 26 Hz and others, which are set to meet the performance parameters of the variable frequency heat pump unit.
Further, under the condition that the step S151 is satisfied, the inverter compressor is turned off, so that the inverter heat pump unit exits defrosting.
In an exemplary embodiment, the preset coil temperature in step S152 and the preset duration in step S153 are preferably set to meet performance parameters of the variable frequency heat pump.
Further, under the condition that the step S152 and/or S153 is satisfied, the variable frequency heat pump unit exits defrosting and enters standby or other operations (such as heating).
FIG. 3 is a block diagram of an inverter heat pump unit according to an exemplary embodiment of the present invention.
FIG. 4 is a piping connection diagram of an execution part of an inverter heat pump unit according to an exemplary embodiment of the present invention.
The invention also provides a variable frequency heat pump unit adopting the defrosting control method of the variable frequency heat pump unit, and as shown in fig. 3 and 4, the variable frequency heat pump unit comprises an execution part 1, a control part 2 and a detection part 3. The execution part 1 comprises a condenser 12, an inverter compressor 11 and an evaporator 13 which are communicated in sequence, and a heat exchange medium is circulated in the execution part 1. The control part 2 is connected with the inverter compressor 11 in a communication way and is suitable for adjusting the running frequency of the inverter compressor 11. The detection part 3 includes a water supply and return temperature detection component 31, an ambient temperature detection component 32, a phase current detection component 35 and a coil temperature detection component 33 which are in communication connection with the control part 2. The water supply and return temperature detection assembly 31 is used for acquiring the water outlet temperature and the return temperature of the condenser. The ambient temperature sensing assembly 32 is used to collect the ambient temperature. The phase current detecting component 35 is used for acquiring the phase current value of the control part. The coil temperature sensing assembly 33 is used to collect the temperature of the coil of the evaporator.
According to the embodiment of the invention, as shown in fig. 3, the variable frequency heat pump unit further comprises a storage part 4. The storage unit 4 is communicatively connected to the control unit 2 for setting parameters and/or timing to the control unit 2.
In an exemplary embodiment, as shown in fig. 3 and 4, the actuator 1 includes an inverter compressor 11, a condenser 12, and an evaporator 13, which are connected in series.
Further, the execution part 1 further comprises a plate heat exchanger, and a pipeline and valve assembly 14 for connecting the variable frequency compressor 11, the condenser 12, the evaporator 13 and the plate heat exchanger.
In detail, the pipe and valve assembly 14 includes, but is not limited to, a sealed pipe for conveying a heat exchange medium (the solid arrows shown in fig. 4 indicate the circulation direction of the heat exchange medium in a heating state) and a heat exchange medium (the hollow arrows shown in fig. 4 indicate the circulation direction of the heat exchange medium in a defrosting state).
Further, the pipeline and valve assembly 14 further includes a valve body (such as a four-way valve, a solenoid valve, an expansion valve, and other connectors and valve structures for connecting or connecting the sealed pipeline).
Still further, the variable frequency heat pump unit also comprises a manual operator 5 which is in communication connection with the control part 2 and is suitable for inputting control quantity and controlling the opening degree of the valve body in a servo control mode.
In an exemplary embodiment, as shown in fig. 3, the variable frequency heat pump unit further includes a control unit 2 communicatively connected to the variable frequency heat pump unit for inputting a control quantity to control the actuator 1, including but not limited to controlling at least one of opening, closing and opening of the valve.
In an exemplary embodiment, the control portion 2 includes a control module 21 and a frequency conversion module 22 communicatively coupled to the control module 21.
In detail, the control module 21 includes, but is not limited to, an industrial personal computer, a Programmable Logic Controller (PLC), and other devices having a signal acquisition function and a signal output function to control the execution unit 1.
Further, the frequency conversion module 22 is in communication connection with the phase current detection component 35 and the frequency conversion compressor 11, and is adapted to control the operating frequency of the frequency conversion compressor 11 according to the current signal collected by the phase current detection component 35.
In an exemplary embodiment, the supply and return water temperature detection assembly 31 includes, but is not limited to, a temperature sensor (e.g., a temperature probe, etc.).
Specifically, the supply and return water temperature detecting unit 31 is provided on a supply line and a return line of the condenser 12.
In an exemplary embodiment, the ambient temperature sensing assembly 32 includes, but is not limited to, a temperature sensor (e.g., a temperature probe, etc.).
In detail, the ambient temperature detection module 32 is disposed outside the variable frequency heat pump unit or on another structure outside the variable frequency heat pump unit.
In an exemplary embodiment, the coil temperature sensing assembly 33 includes, but is not limited to, the use of a temperature sensor (e.g., a temperature probe, etc.).
In detail, the coil temperature detecting assembly 33 is disposed at a coil position of the evaporator 13.
In an exemplary embodiment, the sensing portion 3 further includes a compressor pressure sensing assembly 34.
In detail, the compressor pressure detecting assembly 34 includes a high-voltage switching probe and a low-voltage switching probe.
Further, the condenser 12 is communicated with the variable frequency compressor 11, the evaporator 13 is communicated with the plate heat exchanger through a four-way valve. Two interfaces of the four-way valve are respectively communicated with the input side and the output side of the variable frequency compressor 11, and the other two interfaces are connected with the evaporator 13 and the pipeline of the plate heat exchanger. The compressor pressure detecting assembly 34 is disposed in a circulation pipeline of the inverter compressor 11, and is respectively used for acquiring a high-voltage switch and a low-voltage switch of the inverter compressor 11 to serve as an upper limit of a pressure protection value and a lower limit of the pressure protection value.
In an exemplary embodiment, the phase current detection assembly 35 includes a device having a phase current detection circuit.
In detail, the phase current detecting unit 35 is connected to the circuit of the inverter compressor.
It should also be noted that directional terms, such as "upper", "lower", "front", "rear", "left", "right", etc., used in the embodiments are only directions referring to the drawings, and are not intended to limit the scope of the present invention. Throughout the drawings, like elements are represented by like or similar reference numerals. Conventional structures or constructions will be omitted when they may obscure the understanding of the present invention.
The embodiments of the present invention have been described above. However, these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Although the embodiments are described separately above, this does not mean that the measures in the embodiments cannot be used in advantageous combination. The scope of the invention is defined by the appended claims and equivalents thereof. Various alternatives and modifications can be devised by those skilled in the art without departing from the scope of the invention, and these alternatives and modifications are intended to fall within the scope of the invention.
Claims (10)
1. A defrosting control method for a variable frequency heat pump unit is characterized by comprising the following steps:
under the condition that the variable frequency heat pump unit meets defrosting conditions, acquiring the initial frequency of a variable frequency compressor of the variable frequency heat pump unit corresponding to the initial outlet water temperature according to the initial outlet water temperature of a condenser of the variable frequency heat pump unit and the maximum target phase current value corresponding to the initial outlet water temperature;
correcting the initial frequency based on the environment temperature of the environment where the variable frequency heat pump unit is located and the change trend of the environment temperature to obtain the operation frequency of the variable frequency compressor during defrosting;
adjusting the operation frequency according to the actual outlet water temperature of a condenser of the variable-frequency heat pump unit and the maximum target phase current value of the variable-frequency compressor corresponding to the actual outlet water temperature;
reducing the operating frequency of the inverter compressor under the condition that the actual phase current value of the inverter compressor is greater than or equal to the phase current maximum value corresponding to the upper limit of the pressure protection value of the inverter heat pump unit;
and controlling the variable-frequency heat pump unit to exit the defrosting state until the variable-frequency heat pump unit meets the condition of exiting defrosting.
2. The control method according to claim 1, wherein the initial outlet water temperature of the condenser of the variable frequency heat pump unit is based on and relative to the initial outlet water temperature when the variable frequency heat pump unit satisfies the defrosting condition
Obtaining the initial frequency of the variable frequency compressor of the variable frequency heat pump unit corresponding to the initial water outlet temperature by the maximum target phase current value, wherein the method comprises the following steps:
establishing a mapping table by taking the outlet water temperature of a condenser of the variable-frequency heat pump unit as a first variable, taking the target phase current value of the variable-frequency compressor corresponding to the outlet water temperature as a second variable and taking the operating frequency of the variable-frequency compressor as a dependent variable;
detecting the initial outlet water temperature of a condenser of the variable frequency heat pump unit, acquiring the maximum target phase current value corresponding to the initial outlet water temperature in the mapping table in a table look-up mode, and taking the running frequency corresponding to the maximum target phase current value as the initial frequency.
3. The control method according to claim 2, wherein the establishing a mapping table first variable and second variable by taking the outlet water temperature of a condenser of the variable frequency heat pump unit as a first variable, the target phase current value of the variable frequency compressor corresponding to the outlet water temperature as a second variable, and the operating frequency of the variable frequency compressor as a dependent variable comprises:
taking the outlet water temperature of a condenser of the variable-frequency heat pump unit as a first variable and the target phase current value of the variable-frequency compressor corresponding to the outlet water temperature as a second variable, and acquiring the theoretical phase current value of the variable-frequency compressor corresponding to the first variable and the second variable;
acquiring a phase current maximum value of the variable frequency compressor based on the upper limit of the pressure protection value of the variable frequency heat pump unit;
and selecting the theoretical phase current value based on the phase current maximum value, acquiring a target phase current value, and establishing a mapping table comprising a plurality of groups of target phase current values.
4. The control method according to claim 3, wherein the selecting the theoretical phase current value based on the phase current maximum value to obtain a target phase current value comprises:
comparing the theoretical phase current value and the phase current maximum value based on the same first variable and second variable;
the theoretical phase current value is smaller than the maximum value of the phase current, and the theoretical phase current value is used as the target phase current value;
and the theoretical phase current value is greater than or equal to the maximum phase current value, and the maximum phase current value is taken as the target phase current value.
5. The control method according to claim 4, wherein the step of correcting the initial frequency based on the ambient temperature of the environment where the variable frequency heat pump unit is located and the trend of change of the ambient temperature to obtain the operating frequency of the variable frequency compressor during defrosting comprises:
establishing a ladder diagram comprising a plurality of correction frequencies based on the environment temperature of the environment where the variable-frequency heat pump unit is located and the change trend of the environment temperature;
selecting a correction frequency corresponding to the environmental temperature of the environment where the variable-frequency heat pump unit is located and the variation trend of the environmental temperature;
and taking the sum of the initial frequency and the correction frequency as the operation frequency of the inverter compressor during defrosting.
6. The control method according to claim 5, wherein the adjusting the operating frequency according to the actual outlet water temperature of the condenser of the variable frequency heat pump unit and the maximum target phase current value of the variable frequency compressor corresponding to the actual outlet water temperature comprises:
detecting the outlet water temperature of a condenser of the variable frequency heat pump unit, acquiring the operating frequency corresponding to the outlet water temperature in the mapping table in a table look-up mode, and operating with the sum of the operating frequency corresponding to the maximum target phase current value and the correction frequency as the new operating frequency of the variable frequency compressor.
7. The control method according to claim 6, wherein reducing the operating frequency of the inverter compressor in the case that the actual phase current value of the inverter compressor is greater than or equal to a phase current maximum value corresponding to an upper pressure protection value limit of the inverter heat pump unit comprises:
detecting the actual phase current value of the variable frequency compressor, and comparing the actual phase current value with the maximum value of the phase current;
and gradually reducing the operating frequency of the inverter compressor by a preset frequency variable according to a preset period until the actual phase current value is greater than or equal to the phase current maximum value.
8. The control method according to any one of claims 1 to 7, wherein the controlling the variable frequency heat pump unit to exit the defrosting state until the variable frequency heat pump unit satisfies the condition of exiting the defrosting includes:
the running frequency of the variable frequency compressor is less than a preset frequency value; or the inlet temperature of the coil pipe of the variable frequency heat pump unit is higher than the preset temperature of the coil pipe; or the defrosting duration time of the variable frequency heat pump unit is longer than the preset duration time.
9. A variable frequency heat pump unit adapted to use the control method as claimed in any one of claims 1 to 8, comprising:
the system comprises an execution part (1) and a heat exchange device, wherein the execution part comprises a condenser (12), an inverter compressor (11) and an evaporator (13) which are communicated in sequence, and a heat exchange medium forms circulation in the execution part;
the control part (2) is in communication connection with the variable frequency compressor (11) and is suitable for adjusting the running frequency of the variable frequency compressor (11);
detection portion (3), with control portion (2) communication connection includes: the water supply and return temperature detection assembly (31) is used for acquiring the water outlet temperature and the return temperature of the condenser (12); an ambient temperature detection assembly (32) for acquiring an ambient temperature; the phase current detection component (35) is used for acquiring a phase current value of the control part;
and the coil temperature detection assembly (33) is used for acquiring the temperature of the coil of the evaporator (13).
10. The variable frequency heat pump unit of claim 9, further comprising: and the storage part (4) is in communication connection with the control part (2) and is used for setting parameters and/or timing for the control part (2).
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| CN114427694A (en) * | 2022-01-27 | 2022-05-03 | 北能合创(北京)科技有限公司 | Defrosting control method for air source heat pump unit and air source heat pump |
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| CN101957067A (en) * | 2010-11-01 | 2011-01-26 | 江苏天舒电器有限公司 | Frequency conversion control method for heat pump water heater |
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