CN109028724A - A method of improving evaporator defrost performance - Google Patents
A method of improving evaporator defrost performance Download PDFInfo
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- CN109028724A CN109028724A CN201810633133.0A CN201810633133A CN109028724A CN 109028724 A CN109028724 A CN 109028724A CN 201810633133 A CN201810633133 A CN 201810633133A CN 109028724 A CN109028724 A CN 109028724A
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- graphene
- evaporator
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- defrost
- fin surface
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/06—Removing frost
- F25D21/08—Removing frost by electric heating
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
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- General Engineering & Computer Science (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The present invention provides a kind of methods for improving evaporator defrost performance, accelerate the defrost of evaporator by using the material of intense radiation and high hydrophobicity.Specifically, clean processing is first carried out to evaporator fin surface using supersonic wave cleaning machine, then heat conductive silica gel is uniformly applied to fin surface, prepared graphene dispersing solution is uniformly applied to the fin surface with heat conductive silica gel again, it is allowed to form one layer of graphene thin layer, the fin for smearing graphene dispersing solution is placed in naturally dry at room temperature, it is kept for temperature constant 30 ~ 60 minutes, after fin dries completely, featheriness sample, the graphene particles for removing fin surface, obtain high hydrophobicity black graphene film in fin surface.By the present invention in that being achieved the effect that accelerate evaporator defrost with the material of intense radiation and high hydrophobicity.
Description
Technical field
The invention belongs to chemical fields, are related to a kind of surface-coating technology, in particular to a kind of to heat in winter
Improve the method for evaporator defrost performance under operating condition using intense radiation heat exchange property and hydrophobic performance.
Background technique
With the development of human society and the progress of science and technology, energy-saving and environmental protection have become global key subjects, by state
The extensive concern of inside and outside scholar.As energy saving as possible in refrigeration, air conditioner industry, the utilization efficiency for improving the energy also has become
The important indicator of evaluation system or product quality.In refrigeration and air conditioning system, evaporator is always what domestic and foreign scholars studied
Key areas, research main purpose are the heat exchange efficiencies in order to improve evaporator, increase heat transfer coefficient.However, evaporator is special
Be not finned tube evaporator at runtime, when especially being run under the conditions of low temperature and high relative humidity, occur it is most common be also most be difficult to
The problem of solving the problems, such as --- evaporator table and frosting, i.e., when humid external air flows through evaporator cold surface, can in pipe
Refrigerant generates the process of heat exchange, contains a large amount of hydrone in humid air, and droplet can be precipitated in these hydrones to the cold
And then it condenses and frosts.Passage at any time, frost layer constantly accumulate thickening.Certain thickness frost is formed on evaporator surface, so that
Evaporator refrigerant cannot come into full contact with air, and thermal resistance increases, and heat transfer deterioration phenomenon occurs；Frost covers on the surface of evaporator
Accumulation, further decreases the heat exchanger channels of evaporator, and when air circulation exchanges heat, the resistance being subject to increases, and flow reduces, in addition
Thermal resistance increases so the coefficient of heat transfer of air side further decreases.Especially under low temperature and high relative humidity environment, the frosting of evaporator is led
Causing degradation of heat exchange performance to form vicious circle, this not only increases energy consumption, but also directly affects the safety of evaporator or even whole system
With stable operation.Therefore, while studying evaporator surface frost Formation Mechanism, a kind of method for pressing down white defrost is also found, with
Improve the Operating ettectiveness of evaporator, reduces energy consumption.
Condensation can be generated when below the dew-point temperature that the surface temperature of evaporator drops to humid air has droplet appearance；
When temperature drops to 0 DEG C or less and is lower than the dew-point temperature of humid air, water vapour will be precipitated and condense and frost.So removing at present
The measure of frost suppression frost is concentrated mainly on the physical parameter and evaporator surface characteristic for changing humid air.
The methods of existing solid dehumidifying and preheating outdoor air can be played by reducing evaporator ambient air humidity
Inhibit the effect of surface frosting, but as the time increases, the wettability power of desiccant and drying system gradually weakens, these factors
So that starting with from environmental parameter, to press down white defrost difficult.
Early in the 1980s, hydrophilic coating has been used for the research for delaying and inhibiting frosting.Hydrophilic coating has very
Strong water imbibition, and a part can be stored and dive cold, compared with uncoated surface, frosting rate and frost is thick reduces has good
Press down white effect.A kind of existing hydrophilic coating can extend to first defrosting cycle 176 minutes from 61 minutes, but by
It is expanded in applying layer absorbent, the air side pressure difference of evaporator is caused to increase, and the coating for adsorbing large quantity of moisture cannot be abundant
It dries so that second of period has only lasted for 39 minutes.So it is to the suppression frost defrost of evaporator surface performance as time went on
It is remarkably decreased.Phenomena such as coating falls off in use for some time, so that coating can not be used for a long time.
Super-hydrophobicity performance by plant surface is influenced, and hydrophobic material has become research hotspot in recent years.It grinds
Study carefully and shows evaporator surface since the retention that condensation is formed subtracts with the reduction of contact angle hysteresis and the increase of contact angle
Small, the retention of super hydrophobic surface reduces 79.82% than water-wetted surface.The retention of common aluminium surface and its distribution by
Frosting degree influences, and super hydrophobic surface is then unaffected.
The distribution of hydrophobic surface droplet is sparse, freezes later, and initial frost crystal occurs later.Pass through electrospinning process, preparation
Micro-nano structure hydrophobic surface is provided, which can effectively delay the time of initial frost crystal appearance, and surface hoar crystal coverage rate is low, tool
There is the white performance of preferable suppression.By comparing the Frost formation process of hydrophobic surface and general surface, hydrophobic surface frosting degree, surface are found
Occluded water is few, thus hydrophobic surface is able to suppress frosting.Existing Defrost method is all to strengthen the skill of defrost from white angle is pressed down
Art has not been reported.In addition, coating prepared by existing hydrophobic coating preparation method is deposited mostly due to not accounting for adhesive
The problems such as being easy to fall off, stable coatings cannot be formed.
Summary of the invention
For above-mentioned technical problem in the prior art, the present invention provides a kind of sides for improving evaporator defrost performance
The method of method, this improvement evaporator defrost performance will solve in the prior art under low temperature and high relative humidity environment, evaporator
Frosting cause degradation of heat exchange performance to form vicious circle, this not only increases energy consumption, but also directly affects evaporator or even entire
The technical issues of safety and stablization operation of system.
The present invention provides a kind of methods for improving evaporator defrost performance, by using intense radiation and high hydrophobicity
The defrost of material acceleration evaporator.
Further, the method for above-mentioned a kind of improvement evaporator defrost performance, first using supersonic wave cleaning machine to evaporation
Device fin surface carries out clean processing, heat conductive silica gel is uniformly then applied to fin surface, then prepared graphene is divided
Dispersion liquid is uniformly applied to the fin surface with heat conductive silica gel, is allowed to form one layer of graphene thin layer, will smear graphene dispersion
The fin of liquid is placed in naturally dry at room temperature, is kept for temperature constant 30~60 minutes, after fin dries completely, featheriness sample,
The graphene particles for removing fin surface, obtain high hydrophobicity black graphene film in fin surface.
Further, the concentration of the graphene dispersing solution is 80mg/ml.
The graphene is replaced using other black surfaces and the good material of hydrophobic performance, such as black silicon material.
The present invention bonds graphene film using heat conductive silica gel, and surface covering made of graphene is black, heat radiation
Performance is strong relative to aluminum fin-stock surface now, and hydrophobicity is also superior to aluminium surface, by the present invention in that with intense radiation and height
Hydrophobic material achievees the effect that accelerate evaporator defrost.With black surface and the good material of hydrophobic performance all can be used for plus
Fast defrost is not limited solely to be made using grapheme material.
The present invention is especially suitable for finned tube evaporator surfaces, by uniformly smearing the black of high hydrophobicity in fin surface
Color material reaches and shortens the defrost defrosting time, realizes and accelerates defrost process, extends the effect of defrosting cycle.
Hydrophobic material has the function of evaporator surface to press down white defrost, and it is few to be mainly manifested in occluded water, hoar crystal shape
At evening time, the defrost defrosting time is short etc..And black surface can effectively increase heat due to its high radiation heat transfer performance
Amount transmitting, accelerates defrost.
Graphene is the New Two Dimensional atomic crystal being made of carbon atom with the monoatomic layer that sp2 hydridization connects, and is to mesh
Before until the most thin two-dimensional material that finds.The graphene film on copper sheet surface can be prepared with semar technique.Copper sheet, aluminium foil
For metal material, static contact angle θ >=120, so that graphene film is more hydrophobic.The graphene film prepared using semar technique
It is easy to operate, high-efficient, at low cost, it is completely embedded, it is not easily to fall off.The graphene black thin film formed is smeared due to its black table
Face and nanostructure further enhance radiation heat transfer, and heating conduction greatly promotes.So high hydrophobicity and good radiation are changed
Hot property can promote the defrost defrosting of copper sheet, aluminium foil surface, extend defrosting cycle.
Heat radiation is the process that object transmits heat in the form of an electromagnetic wave.The reflectivity on black coating surface is low, absorbs
Rate is high, that is to say, that under the irradiation of identical External Heat Flux, black is higher with respect to other color absorption thermal efficiencies.By
Kirchhoff thermal radiation law: at a temperature of any given, electromagenetic wave radiation of all objects to any given wavelength, tool
There is identical absorption-injection ratio；And the ratio is equal to absolute black body at this temperature and compares phase to absorption-injection of the setted wavelength
Together.I.e. for the quantity of the wavelength of different radiation, absorption it is more, release it is more.So black surface coating has spoke
It penetrates good effect of heat exchange, the advantages that thermally conductive solar collecting performance is strong, the defrost time can be greatly shortened.By present inventor it is demonstrated experimentally that
The graphene surface defrost time is fast compared with copper, aluminium gold metal surface.
The present invention is compared with prior art, and technological progress is significant.The present invention provides a kind of novel heat exchangers
Surface covering, technical characterstic are that coating can reinforce radiation heat transfer with black surface and coating has high hydrophobicity.Black
Surface can reinforce radiation heat transfer, increase heat transfer effect；Hydrophobic coating surface is because have very low wettability, and water droplet exists
There is very high contact angle on surface, easily rolls.This defrosting defrost characteristic that coating has been had in evaporimeter frosting, Ke Yiyou
Effect shortens the defrost time, extends defrosting cycle, reduces defrosting number.
Detailed description of the invention
Fig. 1 be smeared grapheme material (B) and do not smear grapheme material (A) the defrost of copper sheet surface after study of water film distribution
Situation.
Specific embodiment
Embodiment 1
The present invention provides a kind of methods for improving evaporator defrost performance, by using intense radiation and high hydrophobicity
Material achievees the effect that accelerate evaporator defrost.Surface covering made of graphene is black, and heat-radiating properties are relative to existing
Modern aluminum fin-stock surface is strong, and hydrophobicity is also superior to aluminium surface.Therefore it is carried out so that graphene is applied to copper sheet, aluminium foil surface as an example
It illustrates.
(1) preparation of graphene dispersing solution
Multi-layer graphene powder is prepared using liquid phase intercalation method.Ethanol solution by graphene, purity higher than 99.7% is set
It is uniformly mixed in 100mL beaker, stirs 30 minutes, mix them thoroughly, surpassed under 100W power in ultrasonic cleaner
Sound 30 minutes, centrifugal treating removed wherein undispersed graphene powder and a small amount of impurity, obtained the graphene point of isotropic stable
Dispersion liquid.
(2) preparation of graphite ene coatings
Clean processing is carried out to evaporator fin surface using supersonic wave cleaning machine first, it is then that heating conduction is good
Heat conductive silica gel is uniformly applied to fin surface, then configured graphene dispersing solution is uniformly applied to the wing with heat conductive silica gel
Piece surface is allowed to form one layer of graphene thin layer.When smearing, appropriately sized sheet glass is taken to dip suitable graphene with tweezers
Dispersion liquid, trowelling is on evaporator fin surface.Sheet glass should be lightly with fin surface on heat conductive silica gel during smearing
It is mobile, notice that amplitude and frequency cannot be too fast, is uniformly applied to sample particle above.Using method in length and breadth when smearing, protect
Fin surface is demonstrate,proved all to cover.The fin for smearing graphene dispersing solution is placed in naturally dry at room temperature, keeps temperature constant 40
Minute, after fin dries completely, with ear washing bulb featheriness sample, remove unattached or not fixation graphene
Grain.Finally hydrophobicity graphene film can be obtained in fin surface.
Further, the concentration of the graphene dispersing solution is 80mg/ml.
The present invention realizes by uniformly smearing the black material of high hydrophobicity in fin surface and accelerates defrost process.With tool
It is illustrated for thering is the nano-graphene of high hydrophobicity to be applied to copper sheet surface.
Test has carried out 2 hours under -12 DEG C, 80% psychrometric condition；The defrost time is to be placed on from operating condition of test taking-up
Time used in environmental working condition frost occurs melting process.
Fig. 1 be smeared grapheme material (B) and do not smear grapheme material (A) the defrost of copper sheet surface after study of water film distribution
Situation.It follows that the graphene surface defrost time is fast compared with copper metallic face.
Present invention is not limited to the embodiments described above, within the essential scope of the present invention, any variation for making, remodeling,
Addition or replacement, all should belong to protection scope of the present invention.
Claims (4)
1. a kind of method for improving evaporator defrost performance, it is characterised in that: by using the material of intense radiation and high hydrophobicity
Material accelerates the defrost of evaporator.
2. a kind of method for improving evaporator defrost performance according to claim 1, it is characterised in that: first use ultrasonic wave
Cleaning machine carries out clean processing to evaporator fin surface, heat conductive silica gel is uniformly then applied to fin surface, then will prepare
Good graphene dispersing solution is uniformly applied to the fin surface with heat conductive silica gel, is allowed to form one layer of graphene thin layer, will apply
The fin for smearing graphene dispersing solution is placed in naturally dry at room temperature, is kept for temperature constant 30 ~ 60 minutes, is dried completely to fin
Afterwards, featheriness sample removes the graphene particles of fin surface, obtains high hydrophobicity black graphene film in fin surface.
3. a kind of method for improving evaporator defrost performance according to claim 2, it is characterised in that: the graphene
The concentration of dispersion liquid is 80mg/ml.
4. a kind of method for improving evaporator defrost performance according to claim 2, it is characterised in that: the graphene
It is replaced using other black surfaces and the good material of hydrophobic performance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810633133.0A CN109028724A (en) | 2018-06-19 | 2018-06-19 | A method of improving evaporator defrost performance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810633133.0A CN109028724A (en) | 2018-06-19 | 2018-06-19 | A method of improving evaporator defrost performance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112361696A (en) * | 2020-11-10 | 2021-02-12 | 长虹美菱股份有限公司 | Evaporator with hydrophobic coating for refrigerator and preparation method thereof |
| CN113710974A (en) * | 2019-11-06 | 2021-11-26 | 海尔智家股份有限公司 | Refrigeration appliance and heating assembly with hydrophobic layer |
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| CN106839161A (en) * | 2017-02-08 | 2017-06-13 | 上海理工大学 | The white type heat pump outdoor unit of suppression |
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| CN103962294A (en) * | 2013-01-29 | 2014-08-06 | 中国科学院化学研究所 | Condensate water resistant anti-icing surface as well as preparation method and application thereof |
| CN103776228A (en) * | 2014-01-27 | 2014-05-07 | 澳柯玛股份有限公司 | Anti-condensation and anti-frosting refrigeration appliance |
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| CN106802106A (en) * | 2017-02-21 | 2017-06-06 | 广东万家乐燃气具有限公司 | A kind of etch-proof heat exchanger preparation method with Graphene diaphragm of heat transfer efficient |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113710974A (en) * | 2019-11-06 | 2021-11-26 | 海尔智家股份有限公司 | Refrigeration appliance and heating assembly with hydrophobic layer |
| CN112361696A (en) * | 2020-11-10 | 2021-02-12 | 长虹美菱股份有限公司 | Evaporator with hydrophobic coating for refrigerator and preparation method thereof |
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Application publication date: 20181218 |