CN102022872B - Defrosting control method for intelligent air cooling heat pump - Google Patents
Defrosting control method for intelligent air cooling heat pump Download PDFInfo
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- CN102022872B CN102022872B CN201010572661A CN201010572661A CN102022872B CN 102022872 B CN102022872 B CN 102022872B CN 201010572661 A CN201010572661 A CN 201010572661A CN 201010572661 A CN201010572661 A CN 201010572661A CN 102022872 B CN102022872 B CN 102022872B
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Abstract
The invention discloses a defrosting control method for an intelligent air cooling heat pump, belonging to the field of refrigeration and air conditioning. The method comprises the following steps: when an air conditioner is started for heating, a controller detects the outdoor ambient temperature and the temperature of a coiled tube of an outdoor heat exchanger; when the temperature of the coiled tube of the outdoor heat exchanger is lower than the preset frosting temperature of the coiled tube, the coiled tube is judged to be frosted, and the difference between the outdoor ambient temperature and the temperature of the coiled tube of the outdoor heat exchanger at the moment is recorded as the initial frosting temperature difference of the coiled tube; and then the difference between the outdoor ambient temperature and the temperature of the coiled tube of the outdoor heat exchanger is dynamically recorded and judged, and when the difference between the difference and the initial frosting temperature difference of the coiled tube recorded previously is greater than the temperature difference of a preset allowable frosting thickness, and the operation time of a compressor is longer than the preset unstable operation time of the compressor, the air conditioner enters a defrosting mode. The invention has the beneficial effects that: defrosting is carried out only when frost is formed, the defrosting frequency of the compressor and time for defrosting every time are reduced, an unnecessary defrosting period is reduced, and the effects of saving electricity and prolonging the service life of equipment are achieved.
Description
Technical field
The invention belongs to air-conditioning technical field.Specifically a kind of intelligent air-cooled heat pump defrosting control method.
Background technology
Air-Cooled Heat Pump Unit is in service in the winter time, and its surface produces condensed water when the outdoor heat exchanger coil temperature is lower than dew-point temperature, and in a single day condensed water is lower than 0 ℃ (changing according to regional atmospheric pressure value can be different) with regard to frosting.If heat exchanger coils surface Yin Wendu crosses low and frosting, certainly will reduce the efficient of heat exchange.Though condensed water has been formed ice during frosting, the exchange total amount of latent heat equates, but the ice sheet of knot on coil pipe not only can reduce heat exchange area, and can reduce the air quantity that can pass through.Along with thickening of frosting, air and coil pipe heat exchanger effectiveness, just air and cold-producing medium heat exchanger effectiveness can be worse and worse.The frost layer has also increased the resistance of air by fin, has changed the geometry of coil pipe, has finally reduced the air quantity of unit.This is a vicious circle, in case frosting on the coil pipe, heat exchange area reduces, and air quantity reduces, and the evaporation of system is continuing, so the heat exchange that needs can only be kept by reducing evaporating temperature, and has reduced evaporating temperature, can further reduce coil surface temperature, strengthen temperature value between the air ports, finally increased the thickness of white layer, caused coil freeze when serious, unit can't be moved.
Theoretical research and experiment all show, heat exchanging device surface spraying plating high hydrophobicity coating, reduce its with the steam surface can, increase contact angle, be effective to the inhibition frosting.In addition,, can carry out purified treatment, can increase wind speed when having ready conditions, make the ice crystal or the super-cooling waterdrop that form in the gas phase pass through the heat exchanger wall as early as possible the humid air of inflow heat exchanger for suppressing frosting; But these measures still can not solve the heat exchanger negative effect that frosting brings under low temperature environment fully, also need better method to remove the frost layer.At present Defrost method commonly used is several nothing more than electrical heating method, hot gas defrosting method, reverse, hot water defrosting's method in the industry.And reverse does not need to increase any auxiliary equipment because of it, only need to allow when the needs defrost commutation of four-way reverse get final product, and the defrost effect is better relatively, thereby is subjected to high praise and generally use in the industry.
Take passages according to relevant document, found that the defrosting loss accounts for 10.2% of heat pump total energy consumption loss, and because the defrosting control method problem, about 27% defrost function is not serious in the fin surface frosting, enter defrost cycle under the situation that does not need to defrost, more or less all there are some problems in certain methods commonly used at present, as some unnecessary defrosting actions take place, and can not in time send disadvantage existence such as signal when maybe needing to defrost.Be extensive use of at present and determine that defrosting method constantly has following several: the only simple control time of the first kind; Second class with the coil pipe leaving air temp as control index; The 3rd class with pressure reduction as controlled quentity controlled variable; The 4th class with the blower fan electric current as index; The 5th class is judged with coil pipe inner refrigerant flow velocity; The 6th class with outdoor outdoor heat exchanger coil temperature and compressor operating time as criterion.Consider to have only the 6th class methods comparative maturity and easily accepted in the industry and be commonly used from the otherness of energy-conservation principle, different regions weather conditions, unit cost and other factors.And these class methods should not defrost and entered defrosting owing to unit still can appear in the two-way restriction of machine running time and outdoor heat exchanger coil temperature by compression, needed defrosting to postpone on the contrary and entered defrosting; As in the very big environment of air water capacity, when heat exchanger surface frost layer very thick, air quantity and heat exchange effect have been had a strong impact on, when being badly in need of wanting defrost, but compressor operating time does not arrive setting-up time, unit still moves under lower evaporating temperature, and it is very big not only to have influenced unit heating effect and energy consumption; And for example at low temperature environment, under the smaller situation of air water capacity, even the heat exchanger surface frost-free, when compressor operating time to also entering defrost periods, so reduced the normal heating operation time of unit greatly, energy consumption increases, and heating effect is affected.
Summary of the invention
The invention provides a kind of intelligent air-cooled heat pump defrosting control method, according to the operation logic of source pump, formulate defrost condition and control method, prolong unit winter heating running time, reduce defrosting number of times and defrosting loss, and unit performance and reliability are improved.
The operation logic of source pump is: the starting stage that heats operation at compressor, heat pump is also unstable, outdoor coil pipe used temperature still is a process that progressively reduces, the difference of external environment temperature and outdoor coil pipe used temperature is also progressively becoming big, and after unit operation is stable, under the outdoor coil pipe used situation that does not have a frosting, will keep a metastable temperature gap between outdoor environment temperature and the outdoor coil pipe used temperature, even outdoor environment temperature is owing to the reason of weather changes, outdoor coil pipe used temperature also can be along with rising or the also corresponding rising of reduction or the reduction of outdoor environment temperature, big variation can not take place in the temperature gap between them, only in the coil surface frosting and reach certain thickness and cause coil pipe heat exchange deleterious, outdoor coil pipe used temperature just can further reduce, temperature gap between outdoor environment temperature and the outdoor coil pipe used temperature just can have bigger variation again, and will will become big gradually along with the increase of coil surface frost thickness.
The present invention realizes with following technical scheme: a kind of intelligent air-cooled heat pump defrosting control method is characterized in that: carry out defrost by the relevant parameter detecting of unit being set defrost control parameter; There is related parameter to comprise: compressor operating time t, outdoor environment temperature Ta, outdoor coil pipe used temperature T c; The control parameter has: compressor irregular operation time t
s, coil pipe frosting temperature T
s, allow frosting thickness temperature difference △ T
sCalculating parameter has: the initial frosting temperature difference of difference △ T, the coil pipe △ T of outdoor environment temperature and outdoor coil pipe used temperature
0With outdoor coil pipe used temperature T
cBe lower than the coil pipe frosting temperature T of setting
sThe judgment basis that begins frosting as coil pipe, with the temperature gap △ T between outdoor environment temperature and the coil surface temperature with respect to the initial frosting temperature difference of the coil pipe of dynamic preservation △ T
0Recruitment as the detection foundation of coil surface frost thickness, and with itself and the permission frosting thickness temperature difference △ T that sets
sCompare, as △ T 〉=△ T
0+ △ T
s, promptly judge coil surface frosting and white layer of heating effect that reaches the thickness of regulation and influenced heat pump, at this moment defrost with regard to finishing to heat and begin;
Defrosting control method is: with the irregular operation time t of compressor operating time t greater than setting
sFinish the stable judgment basis that heats of initial launch stage as unit; Behind air-conditioner start heating operation, i.e. compressor operating starting stage, with the outdoor environment temperature Ta of current time and the temperature gap △ T between the coil temperature Tc as the initial frosting temperature difference of coil pipe △ T
0, i.e. t≤t
s, △ T then
0=△ T, as the foundation of judging the coil pipe frosting and write down the outdoor environment temperature of moment and outdoor heat exchanger coil temperature difference as the initial frosting temperature difference of coil pipe; After this outdoor environment temperature and outdoor heat exchanger coil temperature difference are done dynamically record and judgement, after the difference of difference and the initial frosting temperature difference of coil pipe of record before is greater than the permission frosting thickness temperature approach of setting, and satisfy compressor operating time greater than the compressor irregular operation time of setting, air-conditioner enters the defrost pattern, promptly after the compressor end initial launch stage begins stable heating, with coil pipe begin before the frosting at the last moment outdoor environment temperature and the temperature gap △ T between the coil surface temperature as the initial frosting temperature difference of coil pipe, i.e. t＞t
s, and Tc 〉=T
s, △ T then
0=△ T
s
The invention has the beneficial effects as follows: realized that frost must change, frostlessly not change; Reduce the number of times of compressor defrosting, reduce the time of each compressor defrosting, reduce unnecessary defrosting cycle, it is ultimate attainment to allow the unit heating operation cycle perform to, improved the service efficiency of refrigeration plant greatly, it can also make that the refrigeration system operating temperature is more stable, reduces cross valve commutation number of times, thereby reaches the effect of economize on electricity, prolongation service life of equipment.
Description of drawings
Fig. 1 is that the present invention works as compressor operating time less than the compressor irregular operation of setting during the time, control system control flow schematic diagram;
Fig. 2 is that the present invention works as compressor operating time greater than the compressor irregular operation of setting during the time, but outdoor coil pipe used temperature is during greater than coil pipe frosting temperature, control system control flow schematic diagram;
Fig. 3 is that the present invention works as compressor operating time greater than the compressor irregular operation time of setting, and outdoor coil pipe used temperature is less than coil pipe frosting temperature, the difference that other satisfies the outdoor environment temperature of dynamically recording and outdoor coil pipe used temperature and the difference of the initial frosting temperature difference of coil pipe that has write down be during greater than the permission frosting thickness temperature approach set, control system control flow schematic diagram.
Among the figure:
The t------compressor operating time;
The Ta-----outdoor environment temperature;
The outdoor coil pipe used temperature of Tc-----;
t
s------compressor irregular operation time;
T
s-----coil pipe frosting temperature;
△ T
s----allows the frosting thickness temperature difference;
△ T------outdoor environment temperature and outdoor coil pipe used temperature poor.
The specific embodiment
After the unit start operation, detect compressor operating time t, outdoor environment temperature Ta, outdoor coil pipe used temperature T c; The control parameter has: compressor irregular operation time t
s, coil pipe frosting temperature T
s, allow frosting thickness temperature difference △ T
sCalculating parameter has: the initial frosting temperature difference of difference △ T, the coil pipe △ T of outdoor environment temperature and outdoor coil pipe used temperature
0
(1) as shown in Figure 1, as t≤t
s, △ T then
0=△ T, system do not enter defrost;
(2) as shown in Figure 2, as t＞t
s, and Tc 〉=T
s, △ T then
0=△ T, system do not enter defrost;
(3) as shown in Figure 3, as t＞t
s, and Tc＜T
s, △ T 〉=△ T
s+ △ T
0, system enters defrost.
Above control logic produces condensed water at its surface when the outdoor heat exchanger coil temperature is lower than dew-point temperature, in a single day condensed water is lower than 0 ℃ (changing according to regional atmospheric pressure value can be different) and with regard to the characteristic of frosting, at a time writes down the initial frosting temperature difference of coil pipe △ T
0As original comparable data, the difference variation according to the front and back data judges whether to enter defrost then; Compare former with good grounds outdoor heat exchanger coil temperature and compressor operating time and control that to enter defrost constantly more intelligent, avoided needing defrost and the disadvantage that do not enter defrost; At low temperature environment, under the smaller situation of air water capacity, heat exchanger surface is not easy frosting on the contrary, and this moment is heating operation for a long time, rather than compressor operating just enters to fixing time and defrosted; Realized that frost must change, frostlessly not change; Reduce the number of times of compressor defrosting, reduce the time of each compressor defrosting, reduce unnecessary defrosting cycle, it is ultimate attainment to allow the unit heating operation cycle perform to, improved the service efficiency of refrigeration plant greatly, it can also make that the refrigeration system operating temperature is more stable, reduces cross valve commutation number of times, thereby reaches the effect of economize on electricity, prolongation service life of equipment.
By such defrosting control method, not only simple, and can well energy savings, overcome the shortcoming of traditional defrost control technology, the better controlled defrost.
Claims (2)
1. an intelligent air-cooled heat pump defrosting control method is characterized in that: carry out defrost by the relevant parameter detecting of unit being set defrost control parameter; There is related parameter to comprise: compressor operating time t, outdoor environment temperature Ta, outdoor coil pipe used temperature T c; The control parameter has: compressor irregular operation time t
s, coil pipe frosting temperature T
s, allow frosting thickness temperature difference △ T
sCalculating parameter has: the initial frosting temperature difference of difference △ T, the coil pipe △ T of outdoor environment temperature and outdoor coil pipe used temperature
0With outdoor coil pipe used temperature T
cBe lower than the coil pipe frosting temperature T of setting
sThe judgment basis that begins frosting as coil pipe, with the temperature gap △ T between outdoor environment temperature and the coil surface temperature with respect to the initial frosting temperature difference of the coil pipe of dynamic preservation △ T
0Recruitment as the detection foundation of coil surface frost thickness, and with itself and the permission frosting thickness temperature difference △ T that sets
sCompare, as △ T 〉=△ T
0+ △ T
s, promptly judge coil surface frosting and white layer of heating effect that reaches the thickness of regulation and influenced heat pump, at this moment defrost with regard to finishing to heat and begin;
Defrosting control method is: with the irregular operation time t of compressor operating time t greater than setting
sFinish the stable judgment basis that heats of initial launch stage as unit; Behind air-conditioner start heating operation, i.e. compressor operating starting stage, with the outdoor environment temperature Ta of current time and the temperature gap △ T between the coil temperature Tc as the initial frosting temperature difference of coil pipe △ T
0, i.e. t≤t
s, △ T then
0=△ T; After this outdoor environment temperature and outdoor heat exchanger coil temperature difference are done dynamically record and judgement, after the difference of difference and the initial frosting temperature difference of coil pipe of record before is greater than the permission frosting thickness temperature approach of setting, and satisfy compressor operating time greater than the compressor irregular operation time of setting, air-conditioner enters the defrost pattern, promptly after the compressor end initial launch stage begins stable heating, with coil pipe begin before the frosting at the last moment outdoor environment temperature and the temperature gap △ T between the coil surface temperature as the initial frosting temperature difference of coil pipe, i.e. t＞t
s, and Tc 〉=T
s, △ T then
0=△ T
s
2. intelligent air-cooled heat pump defrosting control method according to claim 1 is characterized in that: outdoor coil pipe used temperature T
cBe the coil pipe middle part temperature of directly measuring, or the corresponding down saturation temperature of cold-producing medium operating pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010572661A CN102022872B (en) | 2010-12-03 | 2010-12-03 | Defrosting control method for intelligent air cooling heat pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010572661A CN102022872B (en) | 2010-12-03 | 2010-12-03 | Defrosting control method for intelligent air cooling heat pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102022872A CN102022872A (en) | 2011-04-20 |
| CN102022872B true CN102022872B (en) | 2011-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010572661A Expired - Fee Related CN102022872B (en) | 2010-12-03 | 2010-12-03 | Defrosting control method for intelligent air cooling heat pump |
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| CN102022872A (en) | 2011-04-20 |
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Denomination of invention: Defrosting control method for intelligent air cooling heat pump Effective date of registration: 20140722 Granted publication date: 20111207 Pledgee: Beijing victory Technology Co., Ltd. Pledgor: Lotus AC (Jiangsu) Co., Ltd. Registration number: 2014990000594 |
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