CN114427694B - Defrosting control method for air source heat pump unit and air source heat pump - Google Patents
Defrosting control method for air source heat pump unit and air source heat pump Download PDFInfo
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- CN114427694B CN114427694B CN202210103369.XA CN202210103369A CN114427694B CN 114427694 B CN114427694 B CN 114427694B CN 202210103369 A CN202210103369 A CN 202210103369A CN 114427694 B CN114427694 B CN 114427694B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/18—Hot-water central heating systems using heat pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1039—Arrangement or mounting of control or safety devices for water heating systems for central heating the system uses a heat pump
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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
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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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
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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
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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
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/025—Compressor control by controlling speed
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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
- F25B2600/00—Control issues
- F25B2600/11—Fan speed control
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/197—Pressures of the evaporator
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2104—Temperatures of an indoor room or compartment
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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]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Conditioning Control Device (AREA)
Abstract
A defrosting control method of an air source heat pump unit comprises the following steps: when the air source heat pump unit heats, the ambient temperature T2 and the evaporation pressure P1 under the heating cycle of the heat pump unit are collected, the evaporation temperature T1 is calculated by a program programming formula through the collected evaporation pressure P1, a curve equation f (delta T) of a difference delta T=T2-T1 changing along with time is generated, derivative calculation of the curve equation f (delta T) is carried out, the change trend of the difference delta T between the evaporation temperature T1 and the ambient temperature T2 is obtained through a derivative calculation result, whether the air source heat pump needs defrosting is judged according to a derivative calculation result comparison, and the frequency of the variable frequency compressor and the variable frequency fan is automatically adjusted to defrost. The defrosting control method provided by the invention utilizes the frequency of the compressor and the fan to defrost in real time under the condition of not changing the heating circulation direction, and solves the problems of energy waste, difficult treatment of defrosting water and influence on comfort. The invention further proposes an air source heat pump implementing such a method.
Description
Technical Field
The invention relates to the technical field of air source heat pumps, in particular to a defrosting control method of an air source heat pump unit based on a frequency conversion technology.
Background
After the air source heat pump unit runs for a period of time under the heating working condition in winter, the surface of the fin heat exchanger can be frosted when the ambient temperature is lower than 0 ℃, the channels among the fins can be blocked by the frosting of the fin heat exchanger, the air flow resistance is increased, and the heat exchange capacity of the fin heat exchanger is reduced. With the continuous progress of frosting, the frost layer on the fin heat exchanger is thickened gradually, and the heat exchange efficiency of unit circulation loop also can drop sharply, and then has led to the heating capacity output of unit to also appear attenuating. Under the condition of serious frosting, the fin heat exchanger can be frozen and leaked, so that the air source heat pump unit can not work normally, and the normal heating of people is affected. Therefore, the air source heat pump unit needs to frequently detect frosting of the fin heat exchanger during heating operation, judges whether defrosting is needed, and ensures that the heat pump unit can operate efficiently.
The most common defrosting methods of the air source heat pump unit are hot gas bypass defrosting and four-way reversing valve reverse defrosting. The hot gas bypass defrosting does not need to change the heating circulation direction of the heat pump unit, and the high-temperature refrigerant is introduced into the fin heat exchanger to defrost, so that the defrosting method is simple to control, but the energy efficiency of the heat pump unit is influenced due to the fact that a part of high-temperature refrigerant is used for defrosting the fin heat exchanger, so that the energy waste is caused, the heating effect is also influenced, and the defrosting method also has the problem that defrosting water is not easy to treat and quickly freezes. The four-way reversing valve is used for defrosting in the reverse direction, so that the working circulation direction of the heat pump unit is changed from heating circulation to refrigeration circulation when the unit needs to defrost, and meanwhile, the fan stops working, and high-temperature refrigerant is discharged into the fin heat exchanger for defrosting. The defrosting process is a refrigerating operation process, so that water cannot be heated, heat of hot water at the user side is consumed, the hot water with reduced temperature is discharged to the hot water side, the water temperature is further reduced, and the comfort of the user is affected. The heat pump unit also needs to pull up the reduced water temperature after defrosting is completed, which is a waste of energy. The same hot air defrosting method has the problems that defrosting water is not easy to treat and can freeze quickly.
Therefore, a new defrosting control method is needed in the technical field of air source heat pumps to solve the above problems.
Disclosure of Invention
Based on the above, in order to solve the above problems in the defrosting technology of the existing air source heat pump unit, the invention provides a defrosting control method of the air source heat pump unit by utilizing a frequency conversion technology. The air source heat pump unit comprises a variable frequency compressor, a fin heat exchanger, a shell and tube heat exchanger, a variable frequency fan, a four-way reversing valve, an expansion valve, a calculation module, a controller and the like. The defrosting control method comprises the steps of collecting the ambient temperature T2 and the evaporation pressure P1 of the heat pump unit under the heating cycle of the air source heat pump unit when the air source heat pump unit heats, calculating the evaporation temperature T1 by a program writing formula through the collected evaporation pressure P1, generating a curve equation f (delta T) of a difference delta T=T2-T1 changing along with time, calculating the derivative of the curve equation f (delta T), obtaining the change trend of the difference delta T of the evaporation temperature T1 and the ambient temperature T2 through the derivative calculation result, comparing and detecting the frosting degree of the fin heat exchanger according to the derivative calculation result, judging whether the air source heat pump needs defrosting, and carrying out defrosting by automatically adjusting the frequencies of the variable frequency compressor and the variable frequency fan.
As a further improvement, when the difference value delta t=t2-T1 between the evaporation temperature T1 and the ambient temperature T2 under the heating cycle of the heat pump unit gradually increases to the point of inflection, namely f '(delta T) > 0 and f' (delta T) =0, the variable frequency fan is automatically adjusted to the highest frequency, and the variable frequency compressor is automatically adjusted to the lowest frequency, so that frosting of the heat exchanger is reduced, and the air source heat pump enters a defrosting mode.
As a further improvement, when the curve equation f (Δt) does not satisfy f' (Δt) > 0 and f "(Δt) =0, the air source heat pump unit maintains the heating mode.
As a further improvement, when the variable frequency compressor is tuned to the lowest frequency and the variable frequency fan is tuned to the highest frequency, the difference Δt between the evaporating temperature T1 and the ambient temperature T2 (Δt=t2-T1) is still increasing, i.e. f' (Δt) <0 is not satisfied to defrost the hot gas bypass.
As a further improvement, when the difference Δt between the evaporating temperature T1 and the ambient temperature T2 (Δt=t2-T1) starts to decrease after the air source heat pump enters the defrosting mode, that is, f' (Δt) <0 is satisfied, the frequency of the inverter compressor can be automatically and properly increased, and the air source heat pump unit gradually resumes the heating function.
As a further improvement, when the difference Δt between the evaporating temperature T1 and the ambient temperature T2 (Δt=t2-T1) is no longer changed, that is, f' (Δt) =0 is satisfied, the variable frequency compressor can automatically adjust the frequency to a normal working state according to the heating requirement.
As a further improvement, when the frequency of the variable frequency compressor is adjusted to the power frequency of 50Hz, the difference delta T between the evaporating temperature T1 and the ambient temperature T2 (delta t=t2-T1) is still reduced, namely, f '(delta T) <0 time-varying fan frequency is adjusted down to normal operation, the heat pump unit enters a heating mode, the difference delta T between the evaporating temperature T1 and the ambient temperature T2 (delta t=t2-T1) is not reduced, namely, f' (delta T) <0 is not satisfied, the maximum frequency of the variable frequency fan is kept unchanged, and defrosting is performed.
As a further improvement, the low pressure P1 data is acquired by a low pressure sensor, and the low pressure P1 is converted into evaporation temperature T1 data by internal conversion, and the ambient temperature T2 is acquired by a temperature sensor.
The air source heat pump comprises a variable frequency compressor, a heat exchanger, a variable frequency fan, a four-way reversing valve, an expansion valve, a temperature sensor, a low pressure sensor, a calculation module and a controller, wherein the low pressure sensor is arranged on an air suction pipe of the variable frequency compressor. For executing the defrosting control method described above.
The invention has the beneficial effects that: according to the defrosting control method of the air source heat pump unit, provided by the invention, under the condition that the heating circulation direction is not changed, the frequencies of the compressor and the fan are adjusted in real time, the frosting degree of the heat exchanger is reduced, and the fan works at a high frequency to sublimate the frost, so that the defrosting purpose is achieved. The invention can defrost in real time according to the operation requirement of the air source heat pump, reduces the defrosting energy consumption and solves the problem of energy waste in a certain range. Meanwhile, after the hot gas bypass is opened to defrost, defrosting water is blown off by utilizing the reverse rotation of the fan, so that the problem that defrosting water on the fin heat exchanger is difficult to treat is solved. In addition, when the air source heat pump is defrosted, the frequency of the compressor can be gradually increased, and the air source heat pump can provide a certain heating amount for people to use, so that the problem of influence on comfort is solved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a defrosting control method of an air source heat pump unit based on a frequency conversion technology;
FIG. 2 is a flow chart of a defrosting control method of an air source heat pump unit based on a frequency conversion technology according to an embodiment of the invention;
fig. 3 is a block diagram of a defrosting control method of an air source heat pump unit based on a frequency conversion technology according to an embodiment of the present invention.
Detailed Description
The invention is further illustrated, but is not intended to be limited to, the following examples, which are given as conventional in the art for structures and processes not specifically identified.
The utility model provides an air source heat pump unit, includes inverter compressor, fin heat exchanger, shell and tube heat exchanger, inverter fan, four-way reversing valve, expansion valve, temperature sensor, low pressure sensor, calculation module and controller, and low pressure sensor installs on inverter compressor breathing pipe. As shown in fig. 1, in the defrosting control method of an air source heat pump unit based on a frequency conversion technology, when the air source heat pump unit heats, an ambient temperature T2 and an evaporation pressure P1 of a heating cycle of the heat pump unit are collected, the evaporation temperature T1 is calculated by a program programming formula from the collected evaporation pressure P1, a curve equation f (Δt) of a difference value Δt=t2-T1 changing along with time is generated, derivative calculation of the curve equation f (Δt) is performed, a trend of a difference value Δt of the evaporation temperature T1 and the ambient temperature T2 is obtained through a derivative calculation result, the frosting degree of a fin heat exchanger is detected according to a derivative calculation result, whether the air source heat pump needs to defrost is judged, and the defrosting or the normal heating mode is maintained by automatically adjusting frequencies of a variable frequency compressor and a variable frequency fan.
As shown in fig. 3, the ambient temperature T2 and the evaporation temperature T1 are collected, in one embodiment, the ambient temperature T2 around which the heat pump unit is located is monitored by an ambient temperature sensor, data collection is performed, the evaporation pressure P1 is monitored by a low pressure sensor mounted on the air suction pipe of the compressor, data collection is performed, and the evaporation pressure P1 is converted into the evaporation temperature T1 by calculating an internal formula of the calculation module program.
As shown in fig. 3, a series of evaporating temperatures T1 and ambient temperatures T2 are transmitted to a calculation module through a communication module to calculate a difference Δt=t2-T1, and the calculated series of differences Δt automatically generate an equation f (Δt) of Δt over time.
As shown in fig. 2, the calculation module calculates in real time whether the first derivative f' (Δt) of the equation f (Δt) is greater than 0 and the second derivative f "(Δt) is equal to 0, and determines whether the frequency of the inverter compressor and the inverter fan needs to be adjusted for defrosting. When f '(Δt) is greater than 0 and f' (Δt) =0, i.e., f (Δt) has an inflection point, which means that Δt gradually increases and the speed of decrease of the evaporation temperature T1 becomes slow, and the frosting amount is about to reach the maximum, as shown in fig. 3, the derivative calculation result is transmitted to the controller, the controller sends an instruction to automatically adjust the frequency of the variable frequency fan to the maximum, the frequency of the variable frequency compressor is automatically adjusted to the minimum, so as to reduce the heat of the refrigerant in the fin heat exchanger absorbed by the air, reduce frosting, and make the frost layer on the fin heat exchanger absorb the heat released after condensing the vapor in the air, so as to achieve the purpose of defrosting. If f' (Δt) > 0 and f "(Δt) =0 conditions are not satisfied, it is not necessary to enter the defrost mode, and the air source heat pump unit maintains the original heating mode.
After the fan frequency is automatically adjusted to the maximum compressor frequency and automatically adjusted to the minimum and enters a defrosting mode, the ambient temperature T2 and the evaporation pressure P1 are still continuously collected, the evaporation temperature T1 is calculated by a program writing formula of the collected evaporation pressure P1, the first derivative f '(delta T) of the equation f (delta T) is calculated through a calculation module, when the calculated first derivative f' (delta T) is less than 0, the difference delta T (delta T=T2-T1) between the evaporation temperature T1 and the ambient temperature T2 is not increased any more and begins to be reduced, and the variable-frequency fan frequency is adjusted to the maximum and the variable-frequency compressor frequency is adjusted to the minimum frequency, so that the defrosting effect is achieved.
In one embodiment, as shown in fig. 2, after the fan frequency is automatically adjusted to the maximum compressor frequency and is automatically adjusted to the minimum, the first derivative f' (Δt) of the equation f (Δt) is calculated to be not smaller than zero, which means that the difference Δt between the evaporating temperature T1 and the ambient temperature T2 (Δt=t2-T1) is still increased, which means that when the compressor frequency is adjusted to the minimum and the fan frequency is adjusted to the maximum, frost cannot be effectively removed, and at this time, the hot gas bypass needs to be opened for defrosting, and at this time, the heating cycle of the heat pump unit is not changed and heating is still performed, and after frost on the fin heat exchanger is removed by the bypassed high-temperature refrigerant hot gas, part of water drops adheres to the fin heat exchanger and is blown off by the fan reversal.
As shown in fig. 2, in one embodiment, after the fan frequency is automatically adjusted to the maximum compressor frequency and automatically adjusted to the minimum compressor frequency and enters the defrosting mode, the ambient temperature T2 and the evaporating pressure P1 are still continuously collected, the evaporating temperature T1 is calculated by programming a formula from the collected evaporating pressure P1, the first derivative f '(Δt) of the equation f (Δt) is calculated by a calculation module, when the difference Δt (Δt=t2-T1) between the evaporating temperature T1 and the ambient temperature T2 is not increased any more and begins to decrease, i.e., when the first derivative f' (Δt) of the equation f (Δt) <0, it can be determined that after the defrosting effect is achieved by adjusting the fan to the maximum frequency and the compressor to the minimum frequency, the controller sends an instruction to automatically adjust the compressor frequency gradually, and the heat pump unit can provide a certain heating amount for people to use, and the comfort of use is ensured while defrosting.
As shown in fig. 2, in one embodiment, in the process that the difference Δt (Δt=t2-T1) between the evaporating temperature T1 and the ambient temperature T2 is not increased any more and starts to decrease, the ambient temperature T2 and the evaporating pressure P1 are continuously collected, the evaporating temperature T1 is calculated by programming the collected evaporating pressure P1, and the calculating module calculates the value of f '(Δt), when f' (Δt) =0 is satisfied, it is indicated that the difference Δt between the evaporating temperature T1 and the ambient temperature T2 is not changed, and the defrosting operation is completed, and at this time, the controller issues an instruction to resume the normal heating operation mode of the compressor. The completion condition of defrosting operation is detected in real time, the normal heating mode is restored in time, the heating efficiency of the air source heat pump is improved while the defrosting efficiency is ensured, and the energy consumption is reduced.
As shown in fig. 2, in one embodiment, the difference Δt (Δt=t2-T1) between the evaporating temperature T1 and the ambient temperature T2 is not increased, the frequency of the variable frequency compressor is gradually increased, the ambient temperature T2 and the evaporating pressure P1 are continuously collected, the evaporating temperature T1 is calculated by programming the collected evaporating pressure P1, and the value of f ' (Δt) is calculated by the calculating module, when the frequency of the variable frequency compressor is adjusted to 50Hz, the difference Δt (Δt=t2-T1) between the evaporating temperature T1 and the ambient temperature T2 is still reduced, that is, when f ' (Δt) <0 is satisfied, an instruction is sent by the controller, the variable frequency fan frequency is adjusted to be in a normal operation, the heat pump unit enters a heating mode, the difference Δt (Δt=t2-T1) between the evaporating temperature T1 and the ambient temperature T2 is not reduced, that is not satisfied, that is, f ' (Δt) <0 keeps the maximum frequency of the variable frequency fan unchanged, and the variable frequency fan is performed.
The foregoing is an exemplary embodiment of the present disclosure, but it should be noted that various changes and modifications could be made herein without departing from the scope of the disclosure as defined by the appended claims. The functions, steps and/or actions of the method claims in accordance with the disclosed embodiments described herein need not be performed in any particular order. Furthermore, although elements of the disclosed embodiments may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.
It should be understood that as used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly supports the exception. It should also be understood that "and/or" as used herein is meant to include any and all possible combinations of one or more of the associated listed items. The foregoing embodiment of the present invention has been disclosed with reference to the number of embodiments for the purpose of description only, and does not represent the advantages or disadvantages of the embodiments.
Those of ordinary skill in the art will appreciate that: the above discussion of any embodiment is merely exemplary and is not intended to imply that the scope of the disclosure of embodiments of the invention, including the claims, is limited to such examples; combinations of features of the above embodiments or in different embodiments are also possible within the idea of an embodiment of the invention, and many other variations of the different aspects of the embodiments of the invention as described above exist, which are not provided in detail for the sake of brevity. Therefore, any omission, modification, equivalent replacement, improvement, etc. of the embodiments should be included in the protection scope of the embodiments of the present invention.
Claims (8)
1. A defrosting control method of an air source heat pump unit is characterized in that: when the air source heat pump unit heats, collecting the ambient temperature T2 and the evaporation pressure P1 under the heating cycle of the heat pump unit, calculating the evaporation temperature T1 by a program programming formula through the collected evaporation pressure P1, generating a curve equation f (delta T) of a difference delta T=T2-T1 changing along with time, calculating the derivative of the curve equation f (delta T), obtaining the change trend of the difference delta T between the evaporation temperature T1 and the ambient temperature T2 through the derivative calculation result, comparing according to the derivative calculation result, judging whether the air source heat pump needs defrosting, and automatically adjusting the frequencies of the variable frequency compressor and the variable frequency fan to defrost;
when the difference delta T1 between the evaporation temperature T1 and the ambient temperature T2 under the heating cycle of the heat pump unit is gradually increased to an inflection point, namely f '(delta T) > 0 and f' (delta T) =0, the variable frequency fan is automatically adjusted to the highest frequency, and the variable frequency compressor is automatically adjusted to the lowest frequency, so that frosting of the heat exchanger is reduced, and the air source heat pump enters a defrosting mode.
2. The defrosting control method of an air source heat pump unit according to claim 1, characterized in that: when the curve equation f (Δt) does not satisfy f' (Δt) > 0 and f "(Δt) =0, the air source heat pump unit maintains the heating mode.
3. The defrosting control method of an air source heat pump unit according to claim 2, characterized in that: when the variable frequency compressor is adjusted to the lowest frequency and the variable frequency fan is adjusted to the highest frequency, the difference delta T between the evaporating temperature T1 and the ambient temperature T2 (delta T=T2-T1) is still increased, namely f' (delta T) is not satisfied, and the hot gas bypass is opened for defrosting.
4. The defrosting control method of an air source heat pump unit according to claim 2, characterized in that: when the air source heat pump enters the defrosting mode, when the difference delta T (delta T=T2-T1) between the evaporating temperature T1 and the ambient temperature T2 starts to be reduced, namely f' (delta T) is satisfied and the frequency of the variable frequency compressor can be automatically and properly increased, and the air source heat pump unit gradually recovers the heating function.
5. The defrosting control method of an air source heat pump unit according to claim 4, wherein: when the difference DeltaT (DeltaT=T2-T1) between the evaporating temperature T1 and the ambient temperature T2 is not changed, the frequency-variable compressor meets f' (DeltaT) =0, and the frequency can be automatically adjusted to a normal working state according to the heating requirement.
6. The defrosting control method of an air source heat pump unit according to claim 4, wherein: when the frequency of the variable frequency compressor is adjusted to the power frequency of 50Hz, the difference DeltaT (DeltaT=T2-T1) between the evaporating temperature T1 and the ambient temperature T2 is still reduced, namely the frequency of the variable frequency fan is reduced to normal operation when f '(DeltaT) is met, the heat pump unit enters a heating mode, the difference DeltaT (DeltaT=T2-T1) between the evaporating temperature T1 and the ambient temperature T2 is not reduced, namely f' (DeltaT) 0 is not met, and the maximum frequency of the variable frequency fan is kept unchanged, so that defrosting is carried out.
7. The defrosting control method of an air source heat pump unit according to claim 1, characterized in that: the low pressure P1 data is acquired through a low pressure sensor, the low pressure P1 is converted into evaporation temperature T1 data through internal conversion, and the ambient temperature T2 is acquired through a temperature sensor.
8. An air source heat pump, characterized in that: the air source heat pump uses the defrosting control method as claimed in any one of claims 1 to 7 to defrost.
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| CN202210103369.XA CN114427694B (en) | 2022-01-27 | 2022-01-27 | Defrosting control method for air source heat pump unit and air source heat pump |
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| CN202210103369.XA CN114427694B (en) | 2022-01-27 | 2022-01-27 | Defrosting control method for air source heat pump unit and air source heat pump |
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Citations (13)
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| CN114427694A (en) | 2022-05-03 |
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