CN114877492A - Heat pump and defrosting control method thereof - Google Patents
Heat pump and defrosting control method thereof Download PDFInfo
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- CN114877492A CN114877492A CN202210488799.8A CN202210488799A CN114877492A CN 114877492 A CN114877492 A CN 114877492A CN 202210488799 A CN202210488799 A CN 202210488799A CN 114877492 A CN114877492 A CN 114877492A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Human Computer Interaction (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a heat pump and a defrosting control method thereof, wherein the method comprises the following steps: obtaining the current outdoor environment temperature THo1, the outdoor unit coil temperature THo2 and the compressor current value I A And the current value I of the outdoor fan motor B (ii) a When the outdoor unit coil temperature THo2 is lower than the frosting critical value T', entering the defrosting condition judgment: when the difference between the coil temperature and the outdoor environment temperature is fixedWhen the value is greater than M, judging that a first defrosting condition is met; according to the current value I of the current compressor A Compared with the change rate Delta I of the current value of the compressor A When Δ I is A The defrosting condition is judged to be met if the defrosting condition is more than 1 and the duration time is not less than a; according to the current value I of the current compressor B Compared with the change rate Delta I of the current value of the compressor B When Δ I is B The defrosting condition is judged to be met by more than 1 and the duration is not less than b; and if the first defrosting condition, the second defrosting condition and the third defrosting condition are simultaneously met, judging that the surface of the outdoor unit fin is frosted, and controlling to start and execute a defrosting action.
Description
Technical Field
The invention relates to the technical field of heat pump control, in particular to a heat pump and a defrosting control method thereof.
Background
In the heat pump outdoor unit, in a winter heating mode, because the surface temperature of the outdoor unit fins is relatively low, the frosting phenomenon is easily generated under the condition of high air humidity. The frosting of the outdoor unit can greatly influence the heat exchange, reduce the heating capacity of the heat pump and influence the normal use of the heat pump.
Therefore, it is very important whether the heat pump can defrost in time. However, most of the existing air conditioning apparatuses use a temperature sensor to determine the conditions of entering the defrosting mode, and under some special working environments, the outdoor unit is judged to be frosted by mistake. A few air-conditioning equipment can also judge through the current value of the fan, but the condition of shielding due to foreign matters cannot be eliminated only by judging the front and rear fixed values; meanwhile, the current defrosting means is realized by switching the heating mode to the cooling mode, so that the heating of the air conditioner is influenced by defrosting each time, and the user experience is reduced.
Therefore, it is desirable to provide a method for controlling defrosting of a heat pump, which can accurately determine frosting of an outdoor unit and enter a defrosting mode more timely.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a defrosting control method for a heat pump, which can accurately determine the frosting condition of an outdoor unit, start a defrosting mode in time, and effectively reduce the influence of defrosting on heating of the heat pump.
In view of the above, the present invention provides a defrosting control method for a heat pump, the method comprising the steps of:
obtaining the current outdoor environment temperature THo1, the outdoor unit coil temperature THo2 and the pressureCompressor current value I A And the current value I of the outdoor fan motor B ；
And entering a defrosting condition judgment when the outdoor unit coil temperature THo2 is lower than a frosting critical value T':
when the difference value between the temperature of the coil and the outdoor environment temperature is a fixed value and the duration time is greater than M, judging that a first defrosting condition is met;
after the defrosting condition is met, according to the current value I of the current compressor A Compared with the change rate Delta I of the current value of the compressor A When Δ I is A The defrosting condition is judged to be met if the defrosting condition is more than 1 and the duration time is not less than a;
after the defrosting condition II is met, according to the current value I of the current compressor B Compared with the change rate Delta I of the current value of the compressor B When Δ I is B The defrosting condition is judged to be met by more than 1 and the duration time is not less than b;
if the defrosting condition is three, judging that the surface of the outdoor unit fin is frosted, and controlling to start and execute a defrosting action;
wherein, the values of M, a and b are set according to the external environment of the application place.
Preferably, the first defrosting condition determining method further includes: dividing the outdoor environment temperature value in advance according to the fluctuation range of the outdoor environment temperature: [ T1, T2], [ T2, T3] … … [ Tn, Tn +1 ]; when the outdoor ambient temperature THo1 falls into different temperature ranges, the difference between the coil temperature and the outdoor ambient temperature and the duration M are also adjusted accordingly.
In another aspect of the present invention, a heat pump is provided, which includes an indoor portion and an outdoor portion, and particularly, the heat pump further includes a control system electrically connected to the indoor portion and the outdoor portion, respectively, a defrosting control unit is configured in the control system, the defrosting control unit includes a controller, and an outdoor unit motor current detection unit, a compressor current detection unit and a data acquisition unit connected to the controller, respectively, and the data acquisition unit includes an outdoor environment temperature detection device and an outdoor unit coil temperature detection device;
the compressor current detection unit is used for detecting and recording the compressor current value I A The outdoor unit motor current detection unit is used for detecting and recording the current value I of the outdoor unit fan motor B The data acquisition unit is used for acquiring temperature and current values;
the controller is used for executing the defrosting control method.
Compared with the prior art, the invention has the beneficial effects that:
the invention can accurately judge the frosting condition of the outdoor unit, start the defrosting mode in time and effectively reduce the influence of defrosting on the heating of the heat pump.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
Fig. 1 is a flow chart of a defrosting control method in an embodiment of the invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The embodiment provides a defrosting control method of a heat pump, which comprises the following steps:
as shown in FIG. 1, the current outdoor environment temperature THo1, outdoor unit coil temperature THo2, and compressor current value I are obtained A And the current value I of the outdoor fan motor B ；
And entering a defrosting condition judgment when the outdoor unit coil temperature THo2 is lower than a frosting critical value T':
when the difference value between the temperature of the coil and the outdoor environment temperature is a fixed value and the duration time is greater than M, judging that a first defrosting condition is met;
after the defrosting condition is met, according to the current value I of the current compressor A Compared with the change rate Delta I of the current value of the compressor A When Δ I A The defrosting condition is judged to be met if the defrosting condition is more than 1 and the duration time is not less than a;
after the defrosting condition II is met, according to the current value I of the current compressor B Compared with the change rate Delta I of the current value of the compressor B When Δ I is B The defrosting condition is judged to be met by more than 1 and the duration time is not less than b;
if the defrosting condition is three, judging that the surface of the outdoor unit fin is frosted, and controlling to start and execute a defrosting action;
wherein, the values of M, a and b are set according to the external environment of the application place.
It should be noted that the defrosting threshold T' of THo2 is a critical value for frosting on the surface of the fins of the heat exchanger of the outdoor unit, and it should be noted that the temperature measurement may have a deviation due to different arrangement positions of the temperature sensors; the fin materials of heat exchangers used by different air-conditioning equipment are different, and the values of T' are not completely consistent and need to be set according to actual test results;
further, according to the technical scheme, the outdoor unit coil temperature sensor is used for detecting and judging the temperature of the outdoor unit coil, and defrosting condition judgment is carried out through the difference value between the outdoor unit coil temperature sensor and the outdoor environment temperature value; specifically, different judgment logics are divided according to the environment temperature interval, whether the temperature of the coil pipe of the outdoor unit of the air conditioner in the outdoor environment and the outdoor environment temperature reach the difference condition of frosting or not is judged according to the different judgment logics, and the control logics are guided to enter the next judgment; based on this, the first defrosting condition determination method specifically further includes: dividing the outdoor environment temperature value in advance according to the fluctuation range of the outdoor environment temperature: [ T1, T2], [ T2, T3] … … [ Tn, Tn +1 ]; when the outdoor environment temperature THo1 falls into different temperature intervals, the difference value and the duration time of the coil temperature and the outdoor environment temperature are correspondingly adjusted in M, specifically, different judgment intervals are entered according to the value of THo1, and when the same frosting state is achieved under different outdoor environments, the difference value of the coil temperature and the environment temperature is not completely the same; the specific temperature interval division is set according to the actual test results of different air conditioners; it should be noted that there is no limit to the number of the THo1 intervals, and the intervals are divided according to the actual use requirement of the air conditioner;
in fig. 1, differences A, B, c.. N between THo1 and THo2 are determined according to actual test data of the air conditioner when the same frosting state is achieved in different outdoor environments;
the duration time 1, 2, 3.. n is the time for which the difference value between the THo1 and the THo2 meets the judgment value, and the value is determined according to the actual test data of the air conditioner;
the change rate Delta I of the current value of the compressor A For the change rate of the current value of the compressor in the defrosting determination period, it should be noted that there are various values of the change rate of the current value, and optionally, the values in a fixed time period before and after the change rate are used as criteria, for example, 10 minutes is used as the time period, IA is the average value of the current in each minute, and is defined as IA1 and IA2 A Is composed of
Different current change rate values are within the scope of the claims;
said Δ I A The duration time is the time from frosting starting to frosting reaching a certain thickness, namely the time of the frosting process can be judged through the current change of the compressor, and the value is determined according to the actual test data of the air conditioner;
the chamberChange rate delta I of motor current value of outdoor unit fan B For the change rate of the current value of the outdoor unit fan motor in the defrosting determination period, it should be noted that there are various values of the change rate of the current value, and optionally, the value in a fixed time period before and after the change rate is used as a reference, for example, 10 minutes is used as the time period, IB is the average current value in each minute, and is defined as IB1, ib2 B Is composed of
According to the technical scheme, the value delta T of THo2-THo1 is one of conditions for judging whether the outdoor unit is frosted, when the temperature of the coil pipe is continuously lower than the outdoor environment temperature by a fixed value, the outdoor unit reaches the frosting condition, and after a period of time M1, the frost of the outdoor unit is accumulated to a certain thickness, so that the defrosting condition can be judged according to the delta T and M1;
according to the technical scheme, the frosting of the outdoor unit causes the heat exchange effect of the heat exchanger of the outdoor unit to be poor, so that the power of the air conditioning system is increased, the power of the compressor is increased when the voltage is constant, and the current is also increased. Meanwhile, the outdoor unit frosting is a process change for a long time, not an instantaneous change, so that the current data I of the compressor is detected A And according to the rate of change of the compressor current value DeltaI A The size of the frosting detection device can judge whether the outdoor unit is frosted or not and accurately reflect the frosting speed of the outdoor unit.
According to the technical scheme, the frost formation of the outdoor unit causes the resistance of the rotation of the fan blades of the outdoor fan to be increased, the load of the outdoor fan is further increased, the power is increased, the power of the outdoor fan is increased and the current is also increased when the voltage is constant, and meanwhile, the frost formation of the outdoor unit is a process change for a long time instead of an instantaneous change, so that the current data I of the motor of the outdoor fan is detected B And according to the change rate delta I of the current value of the outdoor unit fan motor B The size of the frosting detection device can judge whether the outdoor unit is frosted or not and accurately reflect the frosting speed of the outdoor unit.
The present embodiment further provides a heat pump, which includes an indoor portion and an outdoor portion, and particularly, the heat pump further includes a control system electrically connected to the indoor portion and the outdoor portion, respectively, a defrosting control unit is configured in the control system, the defrosting control unit includes a controller, and an outdoor unit motor current detection unit, a compressor current detection unit, and a data acquisition unit connected to the controller, respectively, and the data acquisition unit includes an outdoor environment temperature detection device and an outdoor unit coil temperature detection device;
the compressor current detection unit is used for detecting and recording the current value I of the compressor A The outdoor unit motor current detection unit is used for detecting and recording the current value I of the outdoor unit fan motor B The data acquisition unit is used for acquiring temperature and current values;
the controller is used for executing the defrosting control method.
In conclusion, the invention can accurately judge the frosting condition of the outdoor unit, start the defrosting mode in time and effectively reduce the influence of defrosting on the heating of the heat pump.
Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments without departing from the principle and spirit of the present invention, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention still fall within the technical scope of the present invention.
Claims (3)
1. A defrosting control method of a heat pump is characterized by comprising the following steps:
obtaining the current outdoor environment temperature THo1, the outdoor unit coil temperature THo2 and the compressor current value I A And the current value I of the outdoor fan motor B ；
And entering a defrosting condition judgment when the outdoor unit coil temperature THo2 is lower than a frosting critical value T':
when the difference value between the temperature of the coil and the outdoor environment temperature is a fixed value and the duration time is greater than M, judging that a first defrosting condition is met;
after the defrosting condition is met, according to the current value I of the current compressor A Compared with the change rate Delta I of the current value of the compressor A When Δ I is A The defrosting condition is judged to be met if the defrosting condition is more than 1 and the duration time is not less than a;
after the defrosting condition II is met, according to the current value I of the current compressor B Compared with the change rate Delta I of the current value of the compressor B When Δ I is B The defrosting condition is judged to be met by more than 1 and the duration time is not less than b;
after the third defrosting condition is met, judging that the surface of the outdoor unit fin is frosted, and controlling to start and execute a defrosting action;
wherein, the values of M, a and b are set according to the external environment of the application place.
2. The defrosting control method of a heat pump according to claim 1, wherein the method of determining the first defrosting condition further includes: dividing the outdoor environment temperature value in advance according to the fluctuation range of the outdoor environment temperature: [ T1, T2], [ T2, T3] … … [ Tn, Tn +1 ]; when the outdoor ambient temperature THo1 falls into different temperature ranges, the difference between the coil temperature and the outdoor ambient temperature and the duration M are also adjusted accordingly.
3. A heat pump comprises an indoor part and an outdoor part, and is characterized by further comprising a control system which is electrically connected with the indoor part and the outdoor part respectively, wherein a defrosting control unit is arranged in the control system, the defrosting control unit comprises a controller, and an outdoor unit motor current detection unit, a compressor current detection unit and a data acquisition unit which are connected with the controller respectively, and the data acquisition unit comprises an outdoor environment temperature detection device and an outdoor unit coil pipe temperature detection device;
the compressor current detection unit is used for detecting and recording pressureCurrent value I of compressor A The outdoor unit motor current detection unit is used for detecting and recording the current value I of the outdoor unit fan motor B The data acquisition unit is used for acquiring temperature and current values;
the controller is configured to execute the defrost control method of claim 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210488799.8A CN114877492A (en) | 2022-04-29 | 2022-04-29 | Heat pump and defrosting control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210488799.8A CN114877492A (en) | 2022-04-29 | 2022-04-29 | Heat pump and defrosting control method thereof |
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| CN114061031A (en) * | 2021-10-28 | 2022-02-18 | 青岛海尔空调器有限总公司 | Air conditioner defrosting control method and device and air conditioner |
| CN215908828U (en) * | 2021-09-24 | 2022-02-25 | 浙江中广电器股份有限公司 | All-in-one machine and wall hanging structure thereof |
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| JP2008014593A (en) * | 2006-07-07 | 2008-01-24 | Matsushita Electric Ind Co Ltd | Air conditioner |
| CN101451779A (en) * | 2007-11-28 | 2009-06-10 | 海尔集团公司 | Defrosting control method for heat pump air conditioner |
| CN101303185A (en) * | 2008-05-22 | 2008-11-12 | 宁波奥克斯电气有限公司 | Defrosting method for heat pump type air conditioner |
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| CN110107987A (en) * | 2019-04-22 | 2019-08-09 | 珠海格力电器股份有限公司 | Outdoor unit defrosting control method, outdoor unit defrosting control device and air-conditioning |
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