CN107576111A - One kind is based on infrared thermal imaging detection air source heat pump defrosting method and control system - Google Patents
One kind is based on infrared thermal imaging detection air source heat pump defrosting method and control system Download PDFInfo
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- CN107576111A CN107576111A CN201710828593.4A CN201710828593A CN107576111A CN 107576111 A CN107576111 A CN 107576111A CN 201710828593 A CN201710828593 A CN 201710828593A CN 107576111 A CN107576111 A CN 107576111A
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- 238000010257 thawing Methods 0.000 title claims abstract description 62
- 238000001931 thermography Methods 0.000 title claims abstract description 47
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- 238000001514 detection method Methods 0.000 title claims abstract description 15
- 238000012545 processing Methods 0.000 claims abstract description 24
- 239000007788 liquid Substances 0.000 claims abstract description 11
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 5
- 239000003507 refrigerant Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- 238000007781 pre-processing Methods 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 238000010977 unit operation Methods 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 2
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- 238000010586 diagram Methods 0.000 description 2
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- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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Abstract
The invention discloses one kind based on infrared thermal imaging detection air source heat pump defrosting method and control system, system includes compressor, gas-liquid separator, four-way reversing valve, indoor heat exchanger, electric expansion valve, outdoor heat exchanger, and the part such as infrared thermography, digital processing unit and the memory of defrosting control correlation, picture output device, humiture recorder；The system realizes that system defrosts using inverse state of cyclic operation and control logic, can effectively avoid defrosting situation by mistake by system and method, save defrosting energy consumption, have the characteristics of energy-conserving and environment-protective.Infrared thermography dual-use, can be exported respectively as surface temperature and surface condition ordinary video exports, and winter can control defrosting operating condition, and summer can detect outdoor unit congestion situations.The system can not only control defrosting situation, can also upload output outdoor unit situation video, facilitate staff's maintenance issue.
Description
Technical field
The present invention relates to air source heat pump defrosting control field, is specifically that a kind of infrared thermal imaging technique that is based on detects air
Source heat pump frosting situation, and corresponding defrosting control method.
Background technology
Net for air-source heat pump units is that building HVAC installs and uses more heat pump assembly at this stage.Air source heat pump
Because its is easy for installation, and energy-saving and emission-reduction when using, therefore be used widely in heating in the winter time.And during winter operation, meet
To greatest problem be exactly outdoor heat exchanger surface frosting problem, with the growth of frost thickness, increase heat exchanger and sky
Thermal resistance between gas；Air mass flow is decreased simultaneously, deteriorates the heat-exchanging state of net for air-source heat pump units, so as to leverage
The operation of unit, there is also compressor shutdown when serious, it is impossible to normal work.Therefore net for air-source heat pump units defrosting problem
Control is significant to ensureing unit reliability service.
At present, numerous researchs have been carried out to the defrosting control method of air source heat pump both at home and abroad, main method has as follows
It is several：
1. time defrosting method：Circulation time progress cycle defrosting is heated by setting fixed heat pump.
2. air pressure difference controls defrosting：By measuring the air pressure difference of evaporator both sides, reach one in pressure at both sides difference
During individual predetermined value, defrosting is proceeded by.
3. the time-temperature, pressure method：An evaporating temperature pressure and a time interval value to be defrosted with last time are set,
When sensor and working time reaching setting value, defrosting circulation is proceeded by.
4. audio oscillator controls defrosting：Surveyed by the resonance frequency for monitoring the audio oscillator being arranged in evaporator
Amount frost thickness defrosts so as to control.
5. frost layer sensor controls defrosting：The frost layer feelings on evaporator are directly monitored using photoelectricity or capacitance probe
Condition.
6. optimal defrosting time control methods：By judging the relation between defrosting time and frosting degree, source pump is controlled
Frosting degree.
7. fuzzy defrosting control system：System carries out data acquisition to atmospheric temperature, fin temperature, blower fan electric current, and
Changed and each input quantity is blurred, based on the reasoning results inquiry defrosting control rule of one group of control rule, it is determined that
Whether need defrosting if desired, then send defrosting control signal, start defrosting circulation.
Although air source heat pump defrosting control method is many at this stage, great number of issues is still suffered from, as heat exchanger fin removes
Frost does not eliminate, and surface frost continues to defrost after eliminating, the practical problem such as defrosting under frostless operating mode, and if being deposited in heat exchanger surface
Also defrosting is made a big impact in ice condition, frequently defrosting can also reduce unit service life by mistake, reduce the operation of system
Efficiency.
The content of the invention
In order to solve problems of the prior art, the present invention provides a kind of based on infrared thermal imaging detection air-source heat
Pump Defrost method and control system, solve the problems, such as that the operation energy consumption of defrosting unit in the prior art is high.
The technical scheme is that：One kind detects air source heat pump defrosting control system based on infrared thermal imaging, including
Compressor, gas-liquid separator, four-way reversing valve, indoor heat exchanger, electric expansion valve, outdoor heat exchanger, and defrosting control phase
Infrared thermography, digital processing unit and memory, picture output device, the humiture recorder of pass；
During winter：Indoor heat exchanger is condenser, and outdoor heat exchanger is evaporator；Compression mechanism high pressure refrigerant vapor passes through
Cross four-way reversing valve and flow to indoor heat exchanger, steam heat release is transformed into refrigerant liquid, flows to electric expansion valve, flows to room afterwards
External heat exchanger, refrigerant endothermic transition finally flow to gas-liquid separator and flow back to compressor completion circulation again into low-pressure steam；It is outdoor
Set infrared thermography to record outdoor heat exchanger hull-skin temperature outside heat exchanger and humiture recorder recording room is set
Outer air themperature and relative humidity；Infrared thermography is completed to input signal by connecting digital processing unit and memory
Processing, and picture output device is used as output monitoring；System is believed using infra red treatment equipment and humiture recorder
Number control air source heat pump defrosting；
During summer：Four-way reversing valve switches operating mode, and indoor heat exchanger is evaporator, and outdoor heat exchanger is condenser.
The infrared thermography is common camera and the compound camera of thermal imaging system, and both are separable to use, and can set
Put wide-angle lens.
The indoor heat exchanger is fan coil, radiant heating plant of floor or wall radiant panel.
One kind is comprised the following steps based on infrared thermal imaging detection air source heat pump defrosting method：
(1) humiture recorder (10) persistently reads outside air temperature t, outdoor air relative humidity RH, when outdoor empty
When temperature degree t≤6 DEG C and outdoor air relative humidity RH >=40%, infrared thermography (7) is opened, if being unsatisfactory for above-mentioned bar
Part, continue to gather t and RH；
(2) Δ t is shot infrared thermography (7) to outdoor heat exchanger outer surface at timed intervals, central processing unit
Analyzed for surface temperature distribution situation, if measuring surface minimum temperature t1<0 DEG C, start next step image processing step,
If being unsatisfactory for condition, continue to shoot outdoor heat exchanger；
(3) image after shooting carries out image preprocessing step, and particular content is to carry out figure to the picture signal received
As filtering, rim detection, finally carry out binary conversion treatment and be converted into black white image；
(4) the check image of the bianry image after processing and the frostless operating mode of system storage is subjected to mathematic interpolation, you can
Frost layer parts of images is obtained, area S1, does ratio with the full frosting product of system record, you can obtain frosting proportionality coefficient X；
(5) judge that frost layer proportionality coefficient X compared with default value X1, if X >=X1, performs next step 6, otherwise continues to return
Return outdoor temperature humidity acquisition step；
(6) defrosting operating condition is run, switches four-way reversing valve, closes indoor set blower fan, unit operation is carried out against state of cyclic operation
Defrosting；
(7) in defrosting mode, Temperature Humidity Sensor continuous collecting outside air temperature t, outdoor air relative humidity RH, when
When outside air temperature t >=6 DEG C or outdoor air relative humidity RH≤40%, infrared thermography (7) is opened, carries out step 8；
If being unsatisfactory for above-mentioned condition, continue to gather t and RH；
(8) open infrared thermography (7) and carry out IMAQ, the surface temperature feelings of collection are analyzed by central processing unit
Condition, if during 0 DEG C of outdoor unit surface temperature t1 ＞, recovering heating condition, otherwise continuing to run with defrosting operating condition.
Beneficial effects of the present invention are：1. the system realizes that system defrosts using inverse state of cyclic operation and control logic, lead to
Defrosting situation by mistake can effectively be avoided by crossing the system, save defrosting energy consumption, have the characteristics of energy-conserving and environment-protective.
2. the system infrared thermography dual-use, it can be exported respectively as surface temperature and surface condition commonly regards
Frequency exports, and winter can control defrosting operating condition, and summer can detect outdoor unit congestion situations.
3. the system can not only control defrosting situation, output outdoor unit situation video, the convenient people that works can also be uploaded
Member's maintenance issue.
Brief description of the drawings
Fig. 1 is present invention defrosting systematic schematic diagram；
Fig. 2 is defrosting control method flow chart of the present invention；
Wherein：1 compressor, 2 gas-liquid separators, 3 four-way reversing valves, 4 indoor heat exchangers, 5 electric expansion valves, change outside Room 6
Hot device, 7 infrared thermographies, 8 digital processing units and memory, 9 picture output devices, 10 humiture recorders.
Embodiment
The present invention is elaborated with reference to the accompanying drawings and detailed description.
The temperature humidity surface temperature control based on infrared thermal imaging detection technique that Fig. 1 of the present invention introduces the present invention is empty
Air supply heat pump defrosting systematic schematic diagram.The system includes compressor 1, gas-liquid separator 2, four-way reversing valve 3, indoor heat exchange
Device 4, electric expansion valve 5, outdoor heat exchanger 6, and infrared thermography 7, digital processing unit and the storage that defrosting control is related
Device 8, picture output device 9, humiture recorder 10.Equipment runs detailed process：Equipment runs winter condition, indoor heat exchange
Device 4 is condenser, and outdoor heat exchanger 6 is evaporator.1 high pressure refrigerant vapor processed of compressor flows to room by four-way reversing valve 3
Interior heat exchanger 4, steam heat release are transformed into refrigerant liquid, flow to electric expansion valve 5, flow to outdoor heat exchanger 6, refrigerant afterwards
Endothermic transition finally flows to gas-liquid separator 2 and flows back to the completion circulation of compressor 1 again into low-pressure steam.Outside outdoor heat exchanger 6
Set infrared thermography 7 to record outdoor heat exchanger hull-skin temperature and the outer Air Temperature of the recording room of humiture recorder 10 is set
Degree and relative humidity.Infrared thermography 7 by connecting digital processing unit and memory 8 completes processing to input signal,
And picture output device 9 is used to be used as output monitoring.System uses infra red treatment equipment and the signal of humiture recorder 10
Control air source heat pump defrosting.Equipment runs summer condition, and four-way reversing valve switching operating mode, indoor heat exchanger 4 is evaporator, room
External heat exchanger 6 is condenser.If there is outdoor unit plugging fault, the auxiliary detection failure problems of infrared thermography 7 can be used.
Above-mentioned infrared thermography is common camera and the compound camera of thermal imaging system, and both are separable to use, and originally sets
Standby settable wide-angle lens, shooting at close range outdoor heat exchanger overall condition.Indoor heat exchanger can use diversified forms, such as fan unit
Pipe, radiant heating plant of floor or wall radiant panel etc..Outdoor heat exchanger, which needs outdoor unit being placed on, avoids direct sunlight area
Domain, or blocked to prevent to influence infrared thermography output effect.Infrared thermography need to be aided in energy-conserving light source,
Light is avoided to cause reflections affect shooting effect using sheen, picture pick-up device needs certain safeguard procedures to prevent from disliking slightly weather
Above equipment is caused to damage.
Temperature humidity surface temperature control air-source heat of the present invention based on infrared thermal imaging detection technique is introduced with reference to Fig. 2
Pump defrosting control method flow chart, including the detailed process of the defrosting control operation logic of all parts, image procossing and remove
The decision process that frost starts over.This patent control logic specifically includes following steps：
(1) humitures recorder 10 persistently reads outside air temperature t, outdoor air relative humidity RH, works as outdoor air
When temperature t≤6 DEG C and outdoor air relative humidity RH >=40%, infrared thermography 7 is opened, if being unsatisfactory for above-mentioned condition,
Continue to gather t and RH；
(2) Δ t is shot infrared thermographies 7 to outdoor heat exchanger outer surface at timed intervals, central processing unit pair
Analyzed in surface temperature distribution situation, if measuring surface minimum temperature t1<0 DEG C, start step (3) image procossing in
Hold, if being unsatisfactory for condition, continue to shoot outdoor heat exchanger；
(3) image after shootings carries out image preprocessing step, and particular content is to carry out figure to the picture signal received
As filtering, rim detection, finally carry out binary conversion treatment and be converted into black white image, f (x, y) represents that image is in space coordinates
The grey scale pixel value at (x, y) place, the gray level of image integrates as G={ 0,1,2 ..., 254,255 } after gray processing processing；
(4) by the bianry image function f (x, y) after processing and system storage frostless operating mode check image g (x, y)
Function carries out mathematic interpolation, you can obtains frost layer partial function H (x, y), the element number that H (x, y) is included is frost layer area
S1, do ratio with the full frosting product S0 of system record, you can obtain frosting proportionality coefficient X；
(5) judges frost layer proportionality coefficient X compared with default value X1, if X >=X1, performs step (6), otherwise continues
Return to outdoor temperature humidity acquisition step；
(6) runs defrosting operating condition, switches four-way reversing valve 3, closes indoor set blower fan, and unit operation enters against state of cyclic operation
Row defrosting；
(7) in defrosting modes, Temperature Humidity Sensor continuous collecting outside air temperature t, outdoor air relative humidity RH,
As outside air temperature t >=6 DEG C or outdoor air relative humidity RH≤40%, infrared thermography 7 is opened, carries out step 8；
If being unsatisfactory for above-mentioned condition, continue to gather t and RH；
(8) opens infrared thermography 7 and carries out IMAQ, and the surface temperature feelings of collection are analyzed by central processing unit
Condition, if during 0 DEG C of outdoor unit surface temperature t1 ＞, recovering heating condition return to step 1 and judging, otherwise continue to run with defrosting operating condition；
Although above in conjunction with accompanying drawing, invention has been described, and the invention is not limited in above-mentioned specific implementation
Mode, above-mentioned embodiment is only schematical, is not restricted, one of ordinary skill in the art is at this
Under the enlightenment of invention, in the case of present inventive concept and scope of the claimed protection is not departed from, many shapes can also be made
Formula, these are belonged within protection scope of the present invention.
Claims (4)
1. one kind based on infrared thermal imaging detection air source heat pump defrosting control system, it is characterised in that including compressor (1),
Gas-liquid separator (2), four-way reversing valve (3), indoor heat exchanger (4), electric expansion valve (5), outdoor heat exchanger (6), and remove
Frost control related infrared thermography (7), digital processing unit and memory (8), picture output device (9), humiture record
Instrument (10)；
During winter：Indoor heat exchanger (4) is condenser, and outdoor heat exchanger (6) is evaporator；Compressor (1) high-pressure refrigerant processed
Steam flows to indoor heat exchanger (4) by four-way reversing valve (3), and steam heat release is transformed into refrigerant liquid, flows to electronic expansion
Valve (5), flows to outdoor heat exchanger (6) afterwards, and refrigerant endothermic transition finally flows to gas-liquid separator (2) again into low-pressure steam
Flow back to compressor (1) and complete circulation；Infrared thermography (7) record outdoor heat exchanger appearance is set outside outdoor heat exchanger (6)
Face temperature and setting humiture recorder (10) record outside air temperature and relative humidity；Infrared thermography (7) is logical
The processing of connection digital processing unit and memory (8) completion to input signal is crossed, and uses picture output device (9) as output
Monitoring；System uses infra red treatment equipment and humiture recorder (10) signal control air source heat pump defrosting；
During summer：Four-way reversing valve switches operating mode, and indoor heat exchanger (4) is evaporator, and outdoor heat exchanger (6) is condenser.
2. according to claim 1 based on infrared thermal imaging detection air source heat pump defrosting control system, it is characterised in that institute
Infrared thermography is stated as common camera and the compound camera of thermal imaging system, both are separable to use, and wide-angle lens can be set.
3. according to claim 1 based on infrared thermal imaging detection air source heat pump defrosting control system, it is characterised in that institute
It is fan coil, radiant heating plant of floor or wall radiant panel to state indoor heat exchanger.
4. one kind is based on infrared thermal imaging detection air source heat pump defrosting method, it is characterised in that comprises the following steps：
(1) humiture recorder (10) persistently reads outside air temperature t, outdoor air relative humidity RH, when outdoor air temperature
When spending t≤6 DEG C and outdoor air relative humidity RH >=40%, infrared thermography (7) is opened, if being unsatisfactory for above-mentioned condition,
Continue to gather t and RH；
(2) Δ t is shot infrared thermography (7) to outdoor heat exchanger outer surface at timed intervals, central processing unit for
Surface temperature distribution situation is analyzed, if measuring surface minimum temperature t1<0 DEG C, start next step image processing step, if not
Meet condition, continue to shoot outdoor heat exchanger；
(3) image after shooting carries out image preprocessing step, and particular content is to carry out image filter to the picture signal received
Ripple, rim detection, finally carry out binary conversion treatment and be converted into black white image；
(4) the check image of the bianry image after processing and the frostless operating mode of system storage is subjected to mathematic interpolation, you can obtain
Frost layer parts of images, area S1, do ratio with the full frosting product of system record, you can obtain frosting proportionality coefficient X；
(5) judge that frost layer proportionality coefficient X compared with default value X1, if X >=X1, performs next step 6, otherwise continue to return to room
Outer humiture collection step；
(6) defrosting operating condition is run, switches four-way reversing valve, closes indoor set blower fan, unit operation is defrosted against state of cyclic operation；
(7) in defrosting mode, Temperature Humidity Sensor continuous collecting outside air temperature t, outdoor air relative humidity RH, outdoor is worked as
When air themperature t >=6 DEG C or outdoor air relative humidity RH≤40%, infrared thermography (7) is opened, carries out step 8；If no
Meet above-mentioned condition, continue to gather t and RH；
(8) open infrared thermography (7) and carry out IMAQ, the surface temperature situation of collection is analyzed by central processing unit,
If during 0 DEG C of outdoor unit surface temperature t1 ＞, recover heating condition, otherwise continue to run with defrosting operating condition.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109612027A (en) * | 2018-12-18 | 2019-04-12 | 天津大学 | A kind of method and control system based on microimaging analysis air source heat pump frosting |
| CN111189157A (en) * | 2018-11-14 | 2020-05-22 | 青岛海尔空调器有限总公司 | Air conditioner and anti-freezing control method thereof |
| CN111189183A (en) * | 2018-11-14 | 2020-05-22 | 青岛海尔空调器有限总公司 | Air conditioner and anti-freezing control method thereof |
| CN112665234A (en) * | 2020-12-10 | 2021-04-16 | 珠海格力电器股份有限公司 | Evaporator defrosting control method and device and heat pump unit |
| WO2023174742A1 (en) * | 2022-03-14 | 2023-09-21 | Bdr Thermea Group B.V. | Method for monitoring frost in a heat pump system |
| CN117515859A (en) * | 2023-12-12 | 2024-02-06 | 广东安旺科技有限公司 | Control method, device and system for centralized water-cooling refrigerating system and storage medium |
| EP4382836A1 (en) * | 2022-12-06 | 2024-06-12 | BDR Thermea Group B.V. | Method for monitoring frost in a heat pump system |
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| CN112665234A (en) * | 2020-12-10 | 2021-04-16 | 珠海格力电器股份有限公司 | Evaporator defrosting control method and device and heat pump unit |
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| WO2023174742A1 (en) * | 2022-03-14 | 2023-09-21 | Bdr Thermea Group B.V. | Method for monitoring frost in a heat pump system |
| EP4382836A1 (en) * | 2022-12-06 | 2024-06-12 | BDR Thermea Group B.V. | Method for monitoring frost in a heat pump system |
| CN117515859A (en) * | 2023-12-12 | 2024-02-06 | 广东安旺科技有限公司 | Control method, device and system for centralized water-cooling refrigerating system and storage medium |
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Application publication date: 20180112 |