CN108895609A - A kind of control method and air-conditioning system of air-conditioning system defrost - Google Patents
A kind of control method and air-conditioning system of air-conditioning system defrost Download PDFInfo
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- CN108895609A CN108895609A CN201810853954.5A CN201810853954A CN108895609A CN 108895609 A CN108895609 A CN 108895609A CN 201810853954 A CN201810853954 A CN 201810853954A CN 108895609 A CN108895609 A CN 108895609A
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- defrost
- tube temperature
- default
- pressure differential
- continuous
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Classifications
-
- 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
- F24F11/62—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
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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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)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses the control methods and air-conditioning system of a kind of air-conditioning system defrost.The control method controls defrosting operation, including following four mode using the tube temperature T1 and front and back pressure differential deltap P1 of outdoor heat exchanger：（1）When tube temperature T1 is in default T0 ± Δ T range, and passes in and out pressure differential deltap P1 within the scope of default P0 ± Δ P, using tube temperature and front and back pressure difference as the judgment basis for entering and exiting defrost；（2）When tube temperature T1 is in default T0 ± Δ T range, passes in and out pressure differential deltap P1 not within the scope of default P0 ± Δ P, using tube temperature as the judgment basis for entering and exiting defrost；（3）When tube temperature T1 is not in default T0 ± Δ T range, passes in and out pressure differential deltap P1 within the scope of default P0 ± Δ P, using front and back pressure difference as the judgment basis for entering and exiting defrost；（4）When tube temperature T1 is not in default T0 ± Δ T range, passes in and out pressure differential deltap P1 not within the scope of default P0 ± Δ P, using tube temperature as the judgment basis for entering and exiting defrost.Defrosting control method proposed by the present invention not only ensure that the heating effect of air-conditioning system, but also compressor band liquid is prevented to run.
Description
Technical field
The present invention relates to the control method of air-conditioning technical field more particularly to a kind of air-conditioning system defrost and use the control
The air-conditioning system of method.
Background technique
When air-conditioning heating, when environment temperature is lower, the evaporating temperature of outdoor heat exchanger is lower, and air-conditioning is easy frosting,
It even freezes, if taking measures not in time, frost or ice the more can be tied the more thick, cause the heating capacity of air-conditioning to decay rapidly, serious shadow
Ring air conditioning comfortableness and user experience；At the same time, outside heat exchange is bad, and it is incomplete to will lead to refrigerant evaporation, may produce
Raw liquid hammer and influence compressor reliability, so in time, accurately defrost be the defencive function of air-conditioning indispensability.Various brands are empty at present
The defrosting control of tune is mostly with outdoor heat exchanger tube temperature for main judgment basis.Due to air-conditioning long-play, outdoor heat exchanger
Surface dirt causes tube temperature detection inaccuracy therefore only can not accurately control defrost by outdoor heat exchanger tube temperature.
Summary of the invention
The present invention proposes a kind of control method of air-conditioning system defrost and the air-conditioning system using the control method.The present invention
The control method of proposition, which not only can guarantee, is accurately controlled defrost, but also is avoided that compressor band liquid is run.
The present invention proposes a kind of control method of air-conditioning system defrost, the control method using outdoor heat exchanger tube temperature and
Front and back pressure difference comes the defrosting operation of control system, including following four mode：
（1）When tube temperature T1 is in default T0 ± Δ T range, and pass in and out pressure differential deltap P1 also within the scope of default P0 ± Δ P when, will manage
Mild front and back two factors of pressure difference are as the judgment basis for entering and exiting defrost；
（2）When tube temperature T1 is in default T0 ± Δ T range, and passes in and out pressure differential deltap P1 not within the scope of default P0 ± Δ P, will manage
Temperature is as the judgment basis for entering and exiting defrost；
（3）When tube temperature T1 is not in default T0 ± Δ T range, and when passing in and out pressure differential deltap P1 within the scope of default P0 ± Δ P, will before
Pressure difference is as the judgment basis for entering and exiting defrost afterwards；
（4）When tube temperature T1 is not in default T0 ± Δ T range, and pass in and out pressure differential deltap P1 also not within the scope of default P0 ± Δ P when,
Using tube temperature as the judgment basis for entering and exiting defrost.
The mode（1）In include the following steps：
After the heating operation t1 time, when the continuous t2 time detects tube temperature T1≤preset temperature TP protected into defrost,
Or the continuous t3 time detects pressure differential deltap P1≤preset pressure difference P0- Δ P into defrost, when, into defrosting operation；
Into after defrost, if the continuous t2' time detects tube temperature T1 >=preset temperature TP ' for exiting defrost, and continuous
When the t3' time detects pressure differential deltap P1 >=P0 ± Δ P, defrosting operation is exited.
The mode（2）In include the following steps：
Judge that pressure difference Δ P1≤P0- Δ P ', Δ P ' are outer machine frosting difference pressuring loss, if so, prompt outdoor unit frosting；If
No, then the continuous t2 time detects T1≤TP, if so, unit enters defrosting operation；
Into after defrost, if the continuous t2' time detects T1 >=TP ', defrosting operation is exited.
The mode（3）In include the following steps：
Δ P1≤P0- Δ P is judged, if the continuous t3 time detects pressure differential deltap P1≤P0- Δ P, into defrosting operation；
Into after defrost, if the continuous t3' time detects pressure differential deltap P1 >=P0+ Δ P, defrosting operation is exited.
The mode（4）In include the following steps：
Judge that Δ P1≤P0- Δ P ', Δ P ' are outer machine frosting difference pressuring loss, if so, prompt outdoor heat exchanger frosting；If it is not,
T1≤TP is then judged, if the continuous t2 time detects T1≤TP, into defrosting operation；
Into after defrost, if the continuous t2' time detects T1 >=TP ', defrosting operation is exited at this time.
The present invention also proposes a kind of air-conditioning system, which has used above-mentioned air-conditioning system defrosting control method.
The present invention by the tube temperature of outdoor heat exchanger of air conditioner and front and back pressure difference combine come precisely judge air conditioner defrost into
Enter and exit, not only ensure that the heating effect, comfort and the experience sense of user of air-conditioning system, but also compressor band liquid is prevented to transport
Row, ensure that the reliability of air-conditioning system.
Detailed description of the invention
Fig. 1 is the system diagram of net for air-source heat pump units of the invention；
Fig. 2 is the flow chart of defrosting control method of the present invention；
Fig. 3 is the flow diagram of the first state in Fig. 2；
Fig. 4 is the flow diagram of second of state in Fig. 2；
Fig. 5 is the flow diagram of the third state in Fig. 2；
Fig. 6 is the flow diagram of the 4th kind of state in Fig. 2.
Specific embodiment
Invention is described in detail with reference to the accompanying drawings and examples.
As shown in Figure 1, heat pump air conditioning system includes compressor 1, outdoor heat exchanger 2, indoor heat exchanger 3, electric expansion valve
4, four-way reversing valve 5 and vapour liquid separator 6.When heating operation, the gas of compressor discharge is entered the room by four-way reversing valve
Enter outdoor heat exchanger 2 after heat exchanger 3, electric expansion valve 4, then by returning to pressure after four-way reversing valve 5 and vapour liquid separator 6
Contracting machine.When defrosting, the high temperature and high pressure gas of compressor discharge enters outdoor heat exchanger 2 by four-way reversing valve and melts to it
Then frost returns to compressor by electric expansion valve 4, indoor heat exchanger 3 and vapour liquid separator 6.
The present invention is provided with temperature sensor and differential pressure pickup on outdoor heat exchanger, and measurement pipe mildly passes in and out pressure difference,
The defrost of air-conditioning system is controlled in conjunction with the two parameters.
Air-conditioning system detects the tube temperature T1 and disengaging pressure differential deltap of outdoor heat exchanger after heating condition runs a period of time t1
P1, and the tube temperature T1 and disengaging pressure differential deltap P1 that will test are compared with preset tube temperature T0 and preset pressure difference P0, finally
Defrosting control is carried out to system according to comparison result.
Defrosting control scheme proposed by the present invention proposes following two Rule of judgment：
1. pressure differential deltap P1 is passed in and out, when disengaging pressure differential deltap P1 is within the scope of default P0 ± Δ P（Δ P is tolerance）, judge the pressure
It is poor effective, it is on the contrary then invalid；
2. the tube temperature T1 of outdoor heat exchanger, when tube temperature T1 is in default T0 ± Δ T range（Δ T is tolerance）, judge the pipe
It is warm effective, it is on the contrary then invalid.
The present invention is based on the effective and failures of the tube temperature T1 of outdoor heat exchanger, disengaging pressure differential deltap P1, are combined into four kinds of defrosts
Mode sets Rule of judgment according to these four defrost patterns, when certain conditions are met, makes entrance or exits sentencing for defrost
It is disconnected.
Mode one after the heating operation t1 time, detects the disengaging pressure differential deltap of outdoor heat exchanger as shown in Figures 2 and 3
P1 and tube temperature T1, if T1 is effective, Δ P1 is effective, that is, when meeting two above Rule of judgment, the continuous t2 time detects tube temperature
T1≤TP, TP are the preset temperature protected into defrost, or the continuous t3 time detects that pressure differential deltap P1≤P0- Δ P, P0 are pre-
If the pressure difference into defrost, any one meet then unit enter defrost program；Otherwise continue heating operation.Into defrost
Later, stop inside and outside blower, if the unit continuous t2' time detects that tube temperature T1 >=TP ', TP ' they are the preset temperature for exiting defrost,
And the continuous t3' time detects pressure differential deltap P1 >=P0 ± Δ P（T3' is shorter with respect to t2', is set according to operating condition）, unit at this time
Defrost is exited, if keeping heating operation as long as there is the requirement not being able to satisfy into defrost in tube temperature or pressure difference.Herein
The judgement for exiting defrost is made in conjunction with two factors of outdoor heat exchanger tube temperature and pressure difference, and it is endless to avoid outdoor heat exchanger defrost
Entirely.
Mode two after the heating operation t1 time, detects the disengaging pressure differential deltap of outdoor heat exchanger as shown in Figure 2 and Figure 4
P1 and tube temperature T1 when Δ P1 is invalid, then further judges that Δ P1≤P0- Δ P ', Δ P ' are outer machine frosting pressure difference if T1 is effective
Loss, if so, prompt outdoor unit frosting；If it is not, then the continuous t2 time detect T1≤TP, if so, unit enters defrost；If
It is no, then continue to keep heating operation；Into after defrost, stop inside and outside blower, if the unit continuous t2' time detects T1 >=TP ',
Unit exits defrosting operation at this time.After this is pressure difference failure, tube temperature is used alone as the foundation for entering and exiting defrost.
Mode three after the heating operation t1 time, detects the disengaging pressure differential deltap of outdoor heat exchanger as shown in Figure 2 and Figure 5
P1 and tube temperature T1 when Δ P1 is effective, then judges Δ P1≤P0- Δ P if T1 is invalid, if the continuous t3 time detects pressure differential deltap
P1≤P0- Δ P, unit enter defrost；Otherwise system heating operation is kept；Into after defrost, stop inside and outside blower, if unit is even
The continuous t3' time detects pressure differential deltap P1 >=P0+ Δ P, and unit exits defrost at this time.Such state fails in outdoor heat exchanger tube temperature
Later, use pressure difference as the foundation for entering and exiting defrost.
Mode four after the heating operation t1 time, detects the disengaging pressure differential deltap of outdoor heat exchanger as shown in Figure 2 and Figure 6
P1 and tube temperature T1, if when T1 and Δ P1 invalid, further judging that Δ P1≤P0- Δ P ', Δ P ' are outer machine frosting pressure difference damage
It loses, if so, prompt outdoor heat exchanger frosting；If it is not, T1≤TP is then judged, if the continuous t2 time detects T1≤TP, unit
Into defrost；Otherwise, system heating operation is kept；Into after defrost, stop inside and outside blower, if the unit continuous t2' time is detected
To T1 >=TP ', unit exits defrost at this time.Unit cannot be introduced into after such state prevents unit normal boot-strap from running a period of time
Defrost and influence heating capacity.
The invention proposes a kind of judgment methods whether to be failed according to outdoor heat exchanger tube temperature and front and back pressure difference, propose four
The method that kind enters and exits defrost, it is ensured that outdoor heat exchanger of air conditioner ice or defrost are complete, ensure that air-conditioning system
Heating effect, comfort and reliability.
Above-described embodiment is merely to illustrate a specific embodiment of the invention.It should be pointed out that for the general of this field
For logical technical staff, without departing from the inventive concept of the premise, several deformations and variation can also be made, these deformations and
Variation all should belong to protection scope of the present invention.
Claims (7)
1. a kind of control method of air-conditioning system defrost, which is characterized in that utilize the tube temperature T1 and front and back pressure difference of outdoor heat exchanger
Δ P1 controls defrosting operation, including following four mode：
（1）When tube temperature T1 is in default T0 ± Δ T range, and passes in and out pressure differential deltap P1 within the scope of default P0 ± Δ P, by tube temperature
With front and back pressure difference as the judgment basis for entering and exiting defrost；
（2）When tube temperature T1 is in default T0 ± Δ T range, passes in and out pressure differential deltap P1 not within the scope of default P0 ± Δ P, by tube temperature
As the judgment basis for entering and exiting defrost；
（3）When tube temperature T1 is not in default T0 ± Δ T range, passes in and out pressure differential deltap P1 within the scope of default P0 ± Δ P, by front and back
Pressure difference is as the judgment basis for entering and exiting defrost；
（4）When tube temperature T1 is not in default T0 ± Δ T range, passes in and out pressure differential deltap P1 not within the scope of default P0 ± Δ P, will manage
Temperature is as the judgment basis for entering and exiting defrost.
2. control method as described in claim 1, which is characterized in that mode（1）In include the following steps：
After the heating operation t1 time, the continuous t2 time detects tube temperature T1≤preset temperature TP protected into defrost, or
When the continuous t3 time detects the pressure difference P0- Δ P of pressure differential deltap P1≤preset into defrost, into defrosting operation；
Into after defrost, if the continuous t2' time detects tube temperature T1 >=preset temperature TP ' for exiting defrost, and continuous
When the t3' time detects pressure differential deltap P1 >=P0 ± Δ P, defrosting operation is exited.
3. control method as claimed in claim 2, which is characterized in that the time t3' is less than t2'.
4. control method as described in claim 1, which is characterized in that mode（2）In include the following steps：
Judge that pressure difference Δ P1≤P0- Δ P ', Δ P ' are outer machine frosting difference pressuring loss, if so, prompt outdoor unit frosting；If
No, then the continuous t2 time judges T1≤TP, if so, system enters defrosting operation；
Into after defrost, if the continuous t2' time detects T1 >=TP ', defrosting operation is exited.
5. control method as described in claim 1, which is characterized in that mode（3）In include the following steps：
Δ P1≤P0- Δ P is judged, if the continuous t3 time detects pressure differential deltap P1≤P0- Δ P, into defrosting operation；
Into after defrost, if the continuous t3' time detects pressure differential deltap P1 >=P0+ Δ P, defrosting operation is exited at this time.
6. control method as described in claim 1, which is characterized in that mode（4）In include the following steps：
Judge that Δ P1≤P0- Δ P ', Δ P ' are outer machine frosting difference pressuring loss, if so, prompt outdoor heat exchanger frosting；If it is not,
T1≤TP is then judged, if the continuous t2 time detects T1≤TP, into defrosting operation；
Into after defrost, if the continuous t2' time detects T1 >=TP ', defrosting operation is exited.
7. a kind of air-conditioning system, which is characterized in that the air-conditioning system uses air-conditioning system described in any one of claims 1-6
System defrosting control method.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810853954.5A CN108895609A (en) | 2018-07-30 | 2018-07-30 | A kind of control method and air-conditioning system of air-conditioning system defrost |
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| CN201810853954.5A CN108895609A (en) | 2018-07-30 | 2018-07-30 | A kind of control method and air-conditioning system of air-conditioning system defrost |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110044036A (en) * | 2019-02-27 | 2019-07-23 | 青岛海尔空调电子有限公司 | Heat source tower control method, control device and heat source tower |
| CN111306853A (en) * | 2020-02-26 | 2020-06-19 | 珠海格力电器股份有限公司 | Air conditioner defrosting method and air conditioner defrosting system for realizing continuous heating |
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| US20130118188A1 (en) * | 2011-11-10 | 2013-05-16 | Justin McKie | Method of defrosting an energy recovery ventilator unit |
| CN203642588U (en) * | 2013-09-05 | 2014-06-11 | 徐州市精英冷暖设备工程有限公司 | Intelligent leeway type defrosting device for cold storage |
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| CN105650821A (en) * | 2016-02-02 | 2016-06-08 | 青岛海尔空调器有限总公司 | Air conditioner defrosting method |
| CN106705347A (en) * | 2016-11-03 | 2017-05-24 | 奥克斯空调股份有限公司 | Intelligent defrosting method for frequency-conversion air conditioner |
| CN107843035A (en) * | 2017-09-30 | 2018-03-27 | 广东芬尼能源技术有限公司 | A kind of Defrost control method |
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| CN2439641Y (en) * | 2000-09-14 | 2001-07-18 | 南京五洲制冷(集团)公司 | Low temp. and low moisture type equipment for constant temp. and constant moisture |
| US20130118188A1 (en) * | 2011-11-10 | 2013-05-16 | Justin McKie | Method of defrosting an energy recovery ventilator unit |
| CN203642588U (en) * | 2013-09-05 | 2014-06-11 | 徐州市精英冷暖设备工程有限公司 | Intelligent leeway type defrosting device for cold storage |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110044036A (en) * | 2019-02-27 | 2019-07-23 | 青岛海尔空调电子有限公司 | Heat source tower control method, control device and heat source tower |
| CN111306853A (en) * | 2020-02-26 | 2020-06-19 | 珠海格力电器股份有限公司 | Air conditioner defrosting method and air conditioner defrosting system for realizing continuous heating |
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