CN109282430A - A method of detection control air-conditioner defrosting - Google Patents
A method of detection control air-conditioner defrosting Download PDFInfo
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- 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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- power
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- refrigerant
- control air
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Classifications
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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
-
- 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
-
- 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
-
- 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)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a kind of methods of detection control air-conditioner defrosting, measure the refrigerant temperature of outdoor unit different location, obtain the refrigerant temperature difference, it is compared with fiducial temperature threshold value, measures the temperature difference before and after prefixed time interval, obtain the refrigerant temperature difference of different time points and compare, measure the power of fan before and after prefixed time interval, the power of fan for obtaining different time points is poor, compares with predetermined power difference threshold value, issues defrosting instruction.Present invention mounting temperature sensor before and after refrigerant flow path; changed by refrigerant temperature; judge outdoor heat exchanger heat transfer effect, tentatively judges whether outdoor heat exchanger whether complete by frosting or defrost; and then detection blower fan changed power; judge whether power swing is more than setting value, it is final determine unit whether frosting or defrosting performance, promote the reliability of frosting detection; guarantee that unit defrosts in time, it is ensured that the stability of unit heating operation.
Description
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811172670.6A CN109282430B (en) | 2018-10-09 | 2018-10-09 | Method for detecting and controlling defrosting of air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811172670.6A CN109282430B (en) | 2018-10-09 | 2018-10-09 | Method for detecting and controlling defrosting of air conditioner |
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| Publication Number | Publication Date |
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| CN109282430A true CN109282430A (en) | 2019-01-29 |
| CN109282430B CN109282430B (en) | 2020-04-07 |
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Cited By (8)
| 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-conditioning |
| 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 for 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 |
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| 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 |
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