CN106482408A - A kind of development approach of the multizone frosting collection of illustrative plates being suitable to prediction air source heat pump frosting degree - Google Patents
A kind of development approach of the multizone frosting collection of illustrative plates being suitable to prediction air source heat pump frosting degree Download PDFInfo
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
Abstract
A kind of preparation method of the multizone frosting collection of illustrative plates being suitable to prediction air source heat pump frosting degree, belongs to prediction air source heat pump frosting degree technical field.The equipment such as net for air-source heat pump units, heat pump type room air conditioner frosting degree under various circumstances is judged and is predicted.Its technical scheme is：Based on ambient temperature and humidity figure, set up the air source heat pump subregion frosting collection of illustrative plates comprising " two lines, 3rd area, five domains ".Wherein, " two lines " is critical condensation line and critical frosting line, and ambient temperature and humidity figure is divided in " 3rd areas " by " two lines ", non-frosting area, condensation zone and frosting area；According to frosting light and heavy degree, and frosting zoning is divided into five regions.Control applied research that frosting collection of illustrative plates in air source heat pump subregion will be carried out with systematicness checking by on-the-spot test and defrosting.The present invention can accurate prediction air source heat pump frosting situation, improve air source heat pump defrosting efficiency, avoid " defrost " accident to occur, improve defrosting control method by mistake.
Description
Technical field
The present invention relates to a kind of be suitable to predict the development approach of the multizone frosting collection of illustrative plates of air source heat pump frosting degree, belong to
In prediction air source heat pump frosting degree technical field.
Background technology
The defrosting problem of air source heat pump is inevitable in actual motion.Preferably defrosting is " defrosting on demand ",
Because frosting is complicated heat transfer, a mass transport process, in actual motion, unit is difficult to judge accurately to defrost start time,
Thus lead to " defrosting " accident of " frostless defrosting " and " having frost not remove " frequently to occur by mistake." by mistake defrosting " problem is difficult to obtain so far
Effectively solve, main cause includes：1) directly survey white technology to be difficult to；2) the white method of survey is still inaccurate indirectly and can not fit
For different geographical, different meteorological conditions；3) research in frosting region is not perfect.Detailed frosting administrative division map Prepenem is enough anti-
Reflect under DIFFERENT METEOROLOGICAL CONDITIONS, the frosting situation of air source heat pump.This figure is to instruct exploitation to be applied to different geographical, different meteorology bar
The basis of the defrosting control method under part.
But there is problems with the research with regard to frosting administrative division map at present：1) the possible frosting model of clear and definite air source heat pump
Enclose, but still not detailed, still it is not enough to instruct design and the exploitation of air source heat pump defrosting control；2) frosting administrative division map is relatively
For rough, only mark possible frosting scope, and specific frosting rate can not draw from figure；3) the frosting figure drawing
Spectrum, from simulation, lacks actual measurement and experimental verification.Due to directly surveying frost and the indirect restriction surveying white technology, frosting region is opened
Send out just particularly important.
Content of the invention
Instant invention overcomes shortcoming of the prior art, develop and a kind of be suitable to predict the many of air source heat pump frosting degree
Region frosting collection of illustrative plates, this collection of illustrative plates is passed through theory analysis and is drawn with the exploitation of the methods such as experimental verification, empty for concentrated expression and prediction
The frosting degree of air supply heat pump unit, frosting rate etc. controls particularly important parameter to defrosting.
For solving the problems, such as above-mentioned technology, the present invention adopts following technical proposals：
A kind of be suitable to predict air source heat pump frosting degree multizone frosting collection of illustrative plates development approach it is characterised in that：
Multizone frosting collection of illustrative plates include abscissa air themperature, vertical coordinate relative air humidity, critical frosting line, critical condensation line, four
The frosting rate curve such as bar.Whole collection of illustrative plates is divided into upper and lower two parts by critical condensation line, and the downside of critical condensation line is non-frosting
Area, the top of critical condensation line has that one parallel with vertical coordinate and the critical frosting line of lower end critical condensation line finally；Critical
Above condensation line, the left side of critical frosting line is frosting area, and the right is condensation zone；Four are had to wait frosting rate bent in frosting area
Line, five regions are divided in frosting, and each region frosting rate is similar；
Determine frosting collection of illustrative plates horizontal stroke, the scope of vertical coordinate first；According to the condition of condensation, frosting, and the epidemic disaster of air
The dew point temperature line such as draw out；Again by coil temperature and Air Temperature are drawn to the field measurement of air source heat pump and data analysiss
The corresponding relation of degree, the condition in conjunction with frosting, condensation determines critical condensation line and critical frosting line；Further according to frosting weight journey
Degree, to wait frosting rate curve, frosting area is further divided into multiple regions such as light frost area, general frosting area, Chong Shuan area, raw
Become multizone frosting collection of illustrative plates；
Critical line in collection of illustrative plates, its descriptive equation is respectively：
Critical frosting line：Ta=x, 5 DEG C≤x≤12 DEG C
Deng frosting rate curve A:RHA=k1A+k2ATa+k3ATa 2；
Deng frosting rate curve B：RHB=k1B+k2BTa+k3BTa 2；
Deng frosting rate curve C：RHC=k1C+k2CTa+k3CTa 2；
Deng frosting rate curve D：RHD=k1D+k2DTa+k3DTa 2；
Critical condensation line (identical frosting rate critical line E)：RHE=RHx–k3ETa+k3ETa 2, 35.52≤RHx≤45.25；
RH and T in above formulaaIt is dimensionless group.
Wherein：
1) the critical frosting line of collection of illustrative plates can occur to change accordingly with the difference of air source heat pump main frame.Due to main frame
Difference, when the heat transfer temperature difference of unit is bigger than normal, critical condensation line moves down, on the contrary then upper move, but general trend is essentially identical；
Following region is：
Upper limit equation：RH=45.25-0.66Ta+0.0157Ta 2；
Lower limit equation：RH=35.52-0.66Ta+0.0157Ta 2；
2) critical frosting line can change with the climate characteristic of the difference of main frame and region, but a left side for mobility scale
Limit value is 5 DEG C, and right limit value is 12 DEG C.
A kind of development approach of multizone frosting collection of illustrative plates being suitable to prediction air source heat pump frosting degree that the present invention provides,
Comprise the steps：
1) will be limited under frosting collection of illustrative plates abscissa (air themperature) with the temperature range that current air source heat pump is mainly suitable for
For -15 DEG C, the upper limit can set according to condition, typically at 6～12 DEG C；Vertical coordinate take relative air humidity scope be 0～
100%；
2) condition according to condensation and frosting, temperature and relative humidity meter using air calculate any point on frosting figure
Dew point temperature, then line equal for dew point temperature is coupled together the dew point temperature line such as formation, such as Fig. 1；
3) relation according to heat transfer temperature difference and coil temperature and air themperature, air source heat pump is carried out on-the-spot test and
The statistical analysis of data, draw coil temperature TwT with air themperatureaCalculating linear relation be：Tw=(1-k2)Ta-
k1；
4) according to 3) in relational expression, appoint take a TaA T all can be drawnw, find same TwThe dew point temperature line such as equal
With this air themperature TaIntersection point be critical condensation point, in collection of illustrative plates, all of critical condensation point is coupled together draw critical
Condensation line；Whether frost is substantially occurred according to heat exchanger surface, determines the critical knot of collection of illustrative plates with the method for on-the-spot test
Frost line.Now collection of illustrative plates includes three regions：Non- frosting area, condensation zone and frosting area；
5) cold-smoothing hardened frost Predicting Performance Characteristics model and linear fit are utilized, in frosting area, by frosting rate identical
Form the frosting rate curves such as four, frosting area is refined as (A), (B), (C), (D), (E) from top to bottom after point matching, connection
Five regions：When net for air-source heat pump units is run respectively in each frosting region, the frosting rate of its outdoor heat exchanger
It is similar, and (A), (B), (C) from top to bottom, (D), the frosting rate in (E) five frosting regions are gradually lowered.I.e. machine
When group is run in frosting region (A), the frosting rate on its outdoor heat exchanger surface is the fastest, on the contrary, at frosting region (E)
During middle operation, frosting rate is the slowest.
6) the frosting situation of experimental test verification collection of illustrative plates regional, draws final collection of illustrative plates.
The invention has the beneficial effects as follows：(1) there is the good suitability, do not limited by region and meteorological condition；(2) can have
Rapidly, the easy frosting situation judging air source heat pump；(3) provide guidance for the improvement and exploitation of defrosting control method,
Promote to reduce the generation of " by mistake defrosting " accident；(4) provide reference for the design of air source heat pump.
Brief description
Fig. 1 is the frosting collection of illustrative plates dew point temperature line such as comprising in the present invention；
Fig. 2 is the multizone frosting collection of illustrative plates of present invention exploitation；
In figure, there is (A) Chong Shuan area in frosting area；(B), (C) general frosting area；(D), (E) light frost area；Knot
White speed：S(A)＞ S(B)＞ S(C)＞ S(D)＞ S(E)；
Non- frosting area is located at (T under critical condensation linew>Td).When net for air-source heat pump units is run in this region
When, its outdoor heat exchanger surface will keep drying, and dew condensation phenomenon will not occur；
Condensation zone is located on critical condensation line, and the right (T in critical frosting linew<TdAnd Tw>Tf).Work as air
When source source pump is run in this region, its outdoor heat exchanger surface will occur dew condensation phenomenon；
Fig. 3 is embodiment of the present invention field measurement collection of illustrative plates：Tx=11.5 DEG C, critical temperature line Ta=6 DEG C.
Specific embodiment
The present invention is described in further detail with specific embodiment below in conjunction with accompanying drawing, but the present invention be not limited to
Lower embodiment.
Embodiment 1
Determine the scope of collection of illustrative plates：In Fig. 1, the temperature range being mainly suitable for according to air source heat pump and no Heating Season are regional
Air source heat pump heating temperature conditionss (using half monthly mean temperature as demarcation line), by the abscissa (air of frosting collection of illustrative plates
Temperature) scope is set to -15 DEG C～11.5 DEG C, and it is 0～100% that vertical coordinate takes the scope of relative air humidity；
Determine critical condensation line：Calculate the dew point temperature of any point on frosting figure using the temperature of air and relative humidity meter
Degree, then line equal for dew point temperature is coupled together the dew point temperature line such as formation；Further according to coil temperature TwT with air themperaturea
Calculation relational expression Tw=(1-k2)Ta- k1, select an air source heat pump, on-the-spot test draws the corresponding k of main frame1=
10.26, k2=0.17；Appointing takes an air themperature just can draw a coil temperature Tw, find out critical condensation as stated above
Line；
Determine critical frosting line：For selected air source heat pump, with heat exchanger surface substantially occur frost be according to
According to obtaining corresponding air themperature T through field measurementa=6 DEG C, as critical frosting line；
The determination of frosting area five line (curve A～curve E)：By setting up the accurate and stronger cold-smoothing of versatility hardened frost spy
Property forecast model, the frosting rate on cold surface under different operating modes in sunykatuib analyses frosting area；Using linear fit, by frosting rate
Identical point fits to curve, frosting rate curve A, B, C, the D such as formation.Last field measurement verifies the correctness of collection of illustrative plates.Figure
In each line equation as follows：
Critical frosting line：Ta=6 DEG C；
Segmentation curve A:RHA=82.64-1.84Ta+0.1189Ta 2；
Segmentation curve B：RHB=69.28-1.09Ta+0.0698Ta 2；
Segmentation curve C：RHC=58.29-0.85Ta+0.065Ta 2；
Segmentation curve D：RHD=50.16-0.54Ta+0.063Ta 2；
Critical condensation line (curve E)：RHE=44.27-0.66Ta+0.0157Ta 2；
In above content, the meaning of each symbology is as follows：
Claims (1)
1. a kind of it is suitable to predict the preparation method of the multizone frosting collection of illustrative plates of air source heat pump frosting degree it is characterised in that many
Region frosting collection of illustrative plates include abscissa air themperature, vertical coordinate relative air humidity, critical frosting line, critical condensation line, etc. knot
White rate curve；Whole collection of illustrative plates is divided into two parts by critical condensation line, critical condensation line following for non-frosting area, positioned at critical
On condensation line, have that one parallel with vertical coordinate and the critical frosting line of lower end critical condensation line finally；On critical condensation line
Side, the left of critical frosting line is frosting area, and right is condensation zone；Four are had to wait frosting rate curve in frosting area, by frosting
Divide into multiple regions, the basic frosting rate in each region is identical；
Critical line in collection of illustrative plates, its descriptive equation is respectively：
Critical frosting line：Ta=x, 5 DEG C≤x≤12 DEG C
Identical frosting rate critical line A:RHA=k1A+k2ATa+k3ATa 2；
Identical frosting rate critical line B：RHB=k1B+k2BTa+k3BTa 2；
Identical frosting rate critical line C：RHC=k1C+k2CTa+k3CTa 2；
Identical frosting rate critical line D：RHD=k1D+k2DTa+k3DTa 2；
Critical condensation line：RHE=RHx–k3ETa+k3ETa 2, 35.52≤RHx≤45.25；RH and T in above formulaaIt is dimensionless ginseng
Number；
Comprise the steps：
1) -15 will be defined under frosting collection of illustrative plates abscissa (air themperature) with the temperature range that current air source heat pump is mainly suitable for
DEG C, the upper limit can set according to condition, at 6～12 DEG C；It is 0～100% that vertical coordinate takes the scope of relative air humidity；
2) condition according to condensation and frosting, calculates the dew of any point on frosting figure using the temperature of air and relative humidity meter
Point temperature, then line equal for dew point temperature is coupled together the dew point temperature line such as formation；
3) relation according to heat transfer temperature difference and coil temperature and air themperature, carries out on-the-spot test and data to air source heat pump
Statistical analysis, draw coil temperature TwT with air themperatureaCalculating linear relation be：Tw=(1-k2)Ta-k1；
4) according to 3) in relational expression, appoint take a TaA T all can be drawnw, find same TwThe dew point temperature line such as equal and this
Air themperature TaIntersection point be critical condensation point, in collection of illustrative plates, all of critical condensation point is coupled together and draws critical condensation
Line；Whether frost is substantially occurred according to heat exchanger surface, determines the critical frosting line of collection of illustrative plates with the method for on-the-spot test；
5) utilize cold-smoothing hardened frost Predicting Performance Characteristics model and linear fit, in frosting area, frosting rate identical point is intended
Close, connect after form the frosting rate curves such as four, frosting area is refined as (A), (B), (C), (D), (E) five from top to bottom
Region：When net for air-source heat pump units is run respectively in each frosting region, the frosting rate of its outdoor heat exchanger is phase
As, and (A), (B), (C) from top to bottom, (D), the frosting rate in (E) five frosting regions be gradually lowered.I.e. unit exists
When running in the A of frosting region, the frosting rate on its outdoor heat exchanger surface is the fastest, on the contrary, runs in the E of frosting region
When, frosting rate is the slowest；
6) the frosting situation of experimental test verification collection of illustrative plates regional, draws final collection of illustrative plates.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106766019A (en) * | 2017-03-17 | 2017-05-31 | 珠海格力电器股份有限公司 | Air-conditioning defrosting control system and air-conditioning defrosting control method |
| CN108981081A (en) * | 2018-06-25 | 2018-12-11 | 广东海悟科技有限公司 | A kind of intelligent defrosting method |
| CN109050197A (en) * | 2018-06-25 | 2018-12-21 | 安徽江淮汽车集团股份有限公司 | heat pump air conditioner defrosting control device and method |
| CN109539622A (en) * | 2018-11-30 | 2019-03-29 | 上海海立睿能环境技术有限公司 | A kind of net for air-source heat pump units and its defrosting control method |
| CN109631440A (en) * | 2018-12-26 | 2019-04-16 | 西安建筑科技大学 | A kind of air source heat pump based on frosting spatial and temporal distributions effectively presses down white method |
| CN109915999A (en) * | 2019-03-13 | 2019-06-21 | 珠海格力电器股份有限公司 | Press down white method and device based on the general air-conditioning of frosting figure |
| CN111814312A (en) * | 2020-06-15 | 2020-10-23 | 北京工业大学 | Selection method for short-term test typical working conditions of air source heat pump heating system |
-
2016
- 2016-10-20 CN CN201610917139.1A patent/CN106482408A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| J.H.ZHU，Y.Y.SUN，W.WANG, S.M.DENG, Y.J.GE，L.T.LI: "Developing a new frosting map to guide defrosting control for airsource heat pump units", 《APPLIED THERMAL ENGINEERING》 * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106766019A (en) * | 2017-03-17 | 2017-05-31 | 珠海格力电器股份有限公司 | Air-conditioning defrosting control system and air-conditioning defrosting control method |
| CN108981081A (en) * | 2018-06-25 | 2018-12-11 | 广东海悟科技有限公司 | A kind of intelligent defrosting method |
| CN109050197A (en) * | 2018-06-25 | 2018-12-21 | 安徽江淮汽车集团股份有限公司 | heat pump air conditioner defrosting control device and method |
| CN109539622A (en) * | 2018-11-30 | 2019-03-29 | 上海海立睿能环境技术有限公司 | A kind of net for air-source heat pump units and its defrosting control method |
| CN109631440A (en) * | 2018-12-26 | 2019-04-16 | 西安建筑科技大学 | A kind of air source heat pump based on frosting spatial and temporal distributions effectively presses down white method |
| CN109631440B (en) * | 2018-12-26 | 2020-12-29 | 西安建筑科技大学 | Air source heat pump effective frost inhibition method based on frosting space-time distribution |
| CN109915999A (en) * | 2019-03-13 | 2019-06-21 | 珠海格力电器股份有限公司 | Press down white method and device based on the general air-conditioning of frosting figure |
| WO2020181874A1 (en) * | 2019-03-13 | 2020-09-17 | 珠海格力电器股份有限公司 | Air conditioner anti-frosting method and apparatus |
| CN109915999B (en) * | 2019-03-13 | 2020-11-06 | 珠海格力电器股份有限公司 | Air conditioner frost suppression method and device based on frosting map |
| CN111814312A (en) * | 2020-06-15 | 2020-10-23 | 北京工业大学 | Selection method for short-term test typical working conditions of air source heat pump heating system |
| CN111814312B (en) * | 2020-06-15 | 2024-01-05 | 北京工业大学 | Selection method for short-term test typical working condition of air source heat pump heating system |
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