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CN109282430A - Method for detecting and controlling defrosting of air conditioner - Google Patents

Method for detecting and controlling defrosting of air conditioner Download PDF

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Publication number
CN109282430A
CN109282430A CN201811172670.6A CN201811172670A CN109282430A CN 109282430 A CN109282430 A CN 109282430A CN 201811172670 A CN201811172670 A CN 201811172670A CN 109282430 A CN109282430 A CN 109282430A
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China
Prior art keywords
power
difference
temperature
refrigerant
temperature difference
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Application number
CN201811172670.6A
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Chinese (zh)
Other versions
CN109282430B (en
Inventor
赵红右
唐长青
黄昌成
陈志杰
桂涛
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN201811172670.6A priority Critical patent/CN109282430B/en
Publication of CN109282430A publication Critical patent/CN109282430A/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41Defrosting; Preventing freezing
    • F24F11/42Defrosting; Preventing freezing of outdoor units
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/50Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61Control or safety arrangements characterised by user interfaces or communication using timers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/62Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63Electronic processing
    • F24F11/64Electronic processing using pre-stored data
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00Control inputs relating to system states
    • F24F2140/20Heat-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)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses a method for detecting and controlling defrosting of an air conditioner, which comprises the steps of measuring the temperature of a refrigerant at different positions of an outdoor unit, obtaining the temperature difference of the refrigerant, comparing the temperature difference with a preset temperature difference threshold value, measuring the temperature difference before and after a preset time interval, obtaining the temperature difference of the refrigerant at different time points, comparing the temperature difference, measuring the power of a fan before and after the preset time interval, obtaining the power difference of the fan at different time points, comparing the power difference with the preset power difference threshold value, and sending a defrosting instruction. According to the invention, the temperature sensors are arranged in front of and behind the refrigerant flow path, the heat exchange effect of the outdoor heat exchanger is judged through the temperature change of the refrigerant, whether the outdoor heat exchanger frosts or is defrosted or is not finished is preliminarily judged, the power change of the fan is further detected, whether the power fluctuation exceeds a set value or not is judged, whether the unit frosts or the defrosting is finished is finally determined, the reliability of frosting detection is improved, the unit is ensured to defrost in time, and the stability of the unit heating operation is ensured.

Description

A method of detection control air-conditioner defrosting
Technical field
The invention belongs to air-conditioner defrosting fields, and in particular to a method of detection control air-conditioner defrosting.
Background technique
When air-conditioning is lower in environment temperature and air humidity content is larger, outdoor heat exchanger surface is easy to appear frost, The heat exchange property for influencing heat exchanger causes air-conditioning heating ability to decline.Mainstream air-conditioner defrosting method on the market at present, is all logical It crosses and temperature sensor detection outdoor heat exchanger temperature is set on outdoor heat exchanger, pass through the variation of the temperature value, or combine Outdoor Air Parameters, judge outdoor evaporator whether frosting, and as whether terminate defrosting judgment basis.
Due to only having an outdoor heat exchanger temperature sensor, in the lesser situation of air humidity content, even if temperature passes The heat exchange temperature that sensor detects is very low, and outdoor heat exchanger also not necessarily can frosting.In this case, cannot accurately sentence Disconnected outdoor heat exchanger whether frosting, unit be easy erroneous judgement implement defrosting, thus cannot accurately and efficiently to outdoor heat exchanger carry out Defrost processing, wastes energy consumption, increases useless defrosting time, and heating is caused to slow down.
Summary of the invention
The present invention is of the existing technology in order to solve the problems, such as, proposes a kind of method of detection control air-conditioner defrosting.
To achieve the goals above, present invention comprises following technical schemes:
The refrigerant temperature of outdoor unit different location is measured, temperature T is obtained1With T2, calculate T1With T2Difference, obtain different The refrigerant temperature difference T of position;Fiducial temperature threshold value Δ Tset, by Δ T and Δ TsetIt compares, if Δ T≤Δ Tset, then when measuring Between between be divided into the temperature difference of t, obtain the refrigerant temperature difference T of different time pointssWith Δ Ts+t;By Δ TsWith Δ Ts+tIt compares, if Δ Ts > Δ Ts+t, then it is divided into the power of fan of t between time of measuring, obtains power WsWith Ws+t, calculate WsWith Ws+tDifference, obtain different The power of fan difference Δ W at time point;Predetermined power difference threshold value Δ Wset, by Δ W and Δ WsetIt compares, if Δ W >=Δ Wset, then Defrosting instruction is issued, refrigerant temperature is otherwise continued to test.
Further, the node of the evaporation tube and finned tube of outdoor unit heat exchanger as measurement temperature is chosen;Measure refrigerant In the temperature T of evaporation tube1, temperature T of the measurement refrigerant in finned tube2;According to formula Δ T=T2-T1It calculates, obtains refrigerant and flow through The temperature difference T of evaporation tube and finned tube heating.
Further, if Δ T > Δ Tset, then the temperature difference for determining that refrigerant flows through outdoor unit heating is more than threshold value, heat exchange More, good effect of heat exchange does not need to defrost, continues to test refrigerant temperature.
Further, time point s is selected, measure and calculates acquisition refrigerant temperature difference Ts;By time interval t, measurement is simultaneously It calculates and obtains refrigerant temperature difference Ts+t
Further, if Δ Ts≤ΔTs+t, then determine that refrigerant flows through the temperature difference that outdoor unit heats up and increases in time interval t Add, heat exchange increases, and heat transfer effect improves, and does not need to defrost, continues to test refrigerant temperature.
Further, time point s is selected, power of fan W is measureds;By time interval t, power of fan W is measureds+t;It presses According to formula Δ W=Ws+t-WsIt calculates, obtains power of fan and pass through the increased difference power Δ W of time interval t.
Further, if Δ W < Δ Wset, then determine that power of fan is less than threshold by the increased difference power of time interval t Value, blower do not promote air quantity to increase heat exchange, and heat transfer effect is uninfluenced, does not need to defrost, continues to test refrigerant temperature.
Further, temperature difference threshold Δ TsetWith difference power threshold value Δ WsetIt is set according to practical frosting situation, the time Point s is selected in Δ T≤Δ TsetAt the time of after, time interval t >=1 second.
The present invention be able to ascend frosting detection reliability, guarantee unit defrost in time, it is ensured that unit heating operation it is steady It is qualitative;Evaporation tube temperature and finned tube temperature on outdoor unit heat exchanger are detected, by comparing the temperature difference of the two, tentatively judges room Whether external heat exchanger whether complete by frosting or defrost;Knot defrost situation is confirmed in conjunction with unit fan operation parameter, promotes heat pump The accuracy of unit defrost operation, and then ensure the high efficiency of unit heating operation;Temperature is installed to pass before and after refrigerant flow path Sensor is changed by refrigerant temperature, to judge outdoor heat exchanger heat transfer effect, and then detection blower fan changed power, judges function Whether rate fluctuation is more than setting value, it is final determine unit whether frosting or defrosting performance.
Detailed description of the invention
Fig. 1 is the flow chart of this method.
Specific embodiment
Specific description is done to technical solution of the present invention below in conjunction with attached drawing:
A method of detection control air-conditioner defrosting, as shown in Figure 1:
The refrigerant temperature for measuring outdoor unit different location, the evaporation tube and finned tube for choosing outdoor unit heat exchanger are as measurement The node of temperature, temperature T of the measurement refrigerant in evaporation tube1, temperature T of the measurement refrigerant in finned tube2, obtain temperature T1With T2, press According to formula Δ T=T2-T1Calculate T1With T2Difference, obtain refrigerant flow through evaporation tube and finned tube heating temperature difference T.
Fiducial temperature threshold value Δ Tset, temperature difference threshold Δ TsetIt is set according to practical frosting situation, by Δ T and Δ Tset It compares, if Δ T > Δ Tset, then the temperature difference for determining that refrigerant flows through outdoor unit heating is more than threshold value, and heat exchange is more, heat transfer effect It is good, it does not need to defrost, continues to test refrigerant temperature.
If Δ T≤Δ Tset, then the temperature difference of t is divided between time of measuring, time interval t >=1 second selects time point s, time Point s is selected in Δ T≤Δ TsetAt the time of after, measure and calculate obtain refrigerant temperature difference Ts, by time interval t, measurement is simultaneously It calculates and obtains refrigerant temperature difference Ts+t, obtain the refrigerant temperature difference T of different time pointssWith Δ Ts+t
By Δ TsWith Δ Ts+tIt compares, if Δ Ts≤ΔTs+t, then determine that refrigerant flows through the temperature difference of outdoor unit heating in the time It is spaced in t and increases, heat exchange increases, and heat transfer effect improves, and does not need to defrost, continues to test refrigerant temperature.
If Δ Ts> Δ Ts+t, then it is divided into the power of fan of t between time of measuring, selects time point s, measures power of fan Ws, By time interval t, power of fan W is measureds+t, obtain power WsWith Ws+t, according to formula Δ W=Ws+t-WsCalculate WsWith Ws+t's Difference obtains power of fan and passes through the increased difference power Δ W of time interval t.
Predetermined power difference threshold value Δ Wset, difference power threshold value Δ WsetIt is set according to practical frosting situation, by Δ W and Δ WsetIt compares, if Δ W < Δ Wset, then determine that power of fan is less than threshold value, blower by the increased difference power of time interval t Air quantity is not promoted to increase heat exchange, heat transfer effect is uninfluenced, does not need to defrost, continues to test refrigerant temperature.
If Δ W >=Δ Wset, then defrosting instruction is issued.
It is above-mentioned to be used as the embodiment of the present invention, it is not intended to limit the present invention, is made all within the spirits and principles of the present invention Any modifications, equivalent replacements, and improvements etc., be all included in the scope of protection of the present invention.

Claims (10)

1. a kind of method of detection control air-conditioner defrosting characterized by comprising
The refrigerant temperature of outdoor unit different location is measured, temperature T is obtained1With T2, calculate T1With T2Difference, obtain different location Refrigerant temperature difference T;
Fiducial temperature threshold value Δ Tset, by Δ T and Δ TsetIt compares, if Δ T≤Δ Tset, then the temperature of t is divided between time of measuring Difference obtains the refrigerant temperature difference T of different time pointssWith Δ Ts+t
By Δ TsWith Δ Ts+tIt compares, if Δ Ts> Δ Ts+t, then it is divided into the power of fan of t between time of measuring, obtains power WsWith Ws+t, calculate WsWith Ws+tDifference, obtain the power of fan difference Δ W of different time points;
Predetermined power difference threshold value Δ Wset, by Δ W and Δ WsetIt compares, if Δ W >=Δ Wset, then issue defrosting instruction, otherwise after Continuous detection refrigerant temperature.
2. the method for detection control air-conditioner defrosting according to claim 1, which is characterized in that the acquisition different location The refrigerant temperature difference, comprising:
Choose the node of the evaporation tube and finned tube of outdoor unit heat exchanger as measurement temperature;
Refrigerant is measured in the temperature T of evaporation tube1, temperature T of the measurement refrigerant in finned tube2
According to formula Δ T=T2-T1It calculates, obtains the temperature difference T that refrigerant flows through evaporation tube and finned tube heating.
3. the method for detection control air-conditioner defrosting according to claim 1, which is characterized in that described by Δ T and Δ TsetIt does Compare, comprising:
If Δ T > Δ Tset, then the temperature difference for determining that refrigerant flows through outdoor unit heating is more than threshold value, and heat exchange is more, good effect of heat exchange, It does not need to defrost, continues to test refrigerant temperature.
4. the method for detection control air-conditioner defrosting according to claim 1, which is characterized in that the acquisition different time points The refrigerant temperature difference, comprising:
Time point s is selected, measure and calculates acquisition refrigerant temperature difference Ts
By time interval t, measures and calculate acquisition refrigerant temperature difference Ts+t
5. the method for detection control air-conditioner defrosting according to claim 1, which is characterized in that described by Δ TsWith Δ Ts+tIt does Compare, comprising:
If Δ Ts≤ΔTs+t, then determining that refrigerant flows through the temperature difference that outdoor unit heats up and increases in time interval t, heat exchange increases, Heat transfer effect improves, and does not need to defrost, continues to test refrigerant temperature.
6. the method for detection control air-conditioner defrosting according to claim 1, which is characterized in that the acquisition different time points Power of fan it is poor, comprising:
Time point s is selected, power of fan W is measureds
By time interval t, power of fan W is measureds+t
According to formula Δ W=Ws+t-WsIt calculates, obtains power of fan and pass through the increased difference power Δ W of time interval t.
7. the method for detection control air-conditioner defrosting according to claim 1, which is characterized in that described by Δ W and Δ WsetIt does Compare, comprising:
If Δ W < Δ Wset, then determine that power of fan is less than threshold value by the increased difference power of time interval t, blower is not promoted For air quantity to increase heat exchange, heat transfer effect is uninfluenced, does not need to defrost, continues to test refrigerant temperature.
8. the method for detection control air-conditioner defrosting according to any one of claims 1 to 7, which is characterized in that the temperature difference threshold It is worth Δ TsetWith difference power threshold value Δ WsetIt is set according to practical frosting situation.
9. the method for detection control air-conditioner defrosting according to any one of claims 1 to 7, which is characterized in that the time point s Selection is in Δ T≤Δ TsetAt the time of after.
10. the method for detection control air-conditioner defrosting according to any one of claims 1 to 7, which is characterized in that between the time Every t >=1 second.
CN201811172670.6A 2018-10-09 2018-10-09 Method for detecting and controlling defrosting of air conditioner Active CN109282430B (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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 conditioner
CN110469983A (en) * 2019-07-26 2019-11-19 青岛海尔空调器有限总公司 For the control method of air-conditioner defrosting, device and air-conditioning
CN110873447A (en) * 2019-11-29 2020-03-10 深圳麦克维尔空调有限公司 Defrosting control method, device and equipment of refrigeration air conditioner
CN111023453A (en) * 2019-12-25 2020-04-17 宁波奥克斯电气股份有限公司 Air conditioner defrosting control method and device, air conditioner and storage medium
CN112303825A (en) * 2020-09-30 2021-02-02 青岛海尔空调电子有限公司 Defrosting control method of heat source tower
CN112524871A (en) * 2020-11-20 2021-03-19 浙江瑞雪制冷设备科技有限公司 Internet of things defrosting start-stop management system and method for refrigerating device
CN112629084A (en) * 2020-12-22 2021-04-09 广东美格动力新能源有限公司 Defrosting operation determination method and defrosting system
CN114608230A (en) * 2020-12-09 2022-06-10 福建佰时德能源科技有限公司 Evaporator system control method and control device
CN115682302A (en) * 2022-11-04 2023-02-03 珠海格力电器股份有限公司 Chassis deicing control method, air source heat pump and air conditioning unit

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CN106352627A (en) * 2016-08-31 2017-01-25 广东美的制冷设备有限公司 Air conditioner and control method and device thereof
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CN106766328A (en) * 2016-11-30 2017-05-31 广东美的制冷设备有限公司 Heat pump and its defrosting control method
CN107238183A (en) * 2017-06-26 2017-10-10 广东美的暖通设备有限公司 Outdoor fan control method, device and computer-readable recording medium

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JP2001215077A (en) * 2000-02-02 2001-08-10 Hitachi Ltd Defrost control device and control method, and refrigerator
DE10311343A1 (en) * 2003-03-14 2004-09-23 Linde Kältetechnik GmbH & Co. KG Defrosting method for e.g. evaporator, involves initiating defrosting when temperature at middle of evaporator is lower than critical temperature or temperature difference between middle and inlet of evaporator is lower than set value
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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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 conditioner
CN110469983A (en) * 2019-07-26 2019-11-19 青岛海尔空调器有限总公司 For the control method of air-conditioner defrosting, device and air-conditioning
CN110873447A (en) * 2019-11-29 2020-03-10 深圳麦克维尔空调有限公司 Defrosting control method, device and equipment of refrigeration air conditioner
CN110873447B (en) * 2019-11-29 2021-11-12 深圳麦克维尔空调有限公司 Defrosting control method, device and equipment of refrigeration air conditioner
CN111023453A (en) * 2019-12-25 2020-04-17 宁波奥克斯电气股份有限公司 Air conditioner defrosting control method and device, air conditioner and storage medium
CN112303825A (en) * 2020-09-30 2021-02-02 青岛海尔空调电子有限公司 Defrosting control method of heat source tower
CN112524871A (en) * 2020-11-20 2021-03-19 浙江瑞雪制冷设备科技有限公司 Internet of things defrosting start-stop management system and method for refrigerating device
CN114608230A (en) * 2020-12-09 2022-06-10 福建佰时德能源科技有限公司 Evaporator system control method and control device
CN114608230B (en) * 2020-12-09 2024-05-03 福建佰时德能源科技有限公司 Evaporator system control method and control device
CN112629084A (en) * 2020-12-22 2021-04-09 广东美格动力新能源有限公司 Defrosting operation determination method and defrosting system
CN115682302A (en) * 2022-11-04 2023-02-03 珠海格力电器股份有限公司 Chassis deicing control method, air source heat pump and air conditioning unit
CN115682302B (en) * 2022-11-04 2024-07-19 珠海格力电器股份有限公司 Chassis deicing control method, air source heat pump and air conditioner unit

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