CN1103904C - Outdoor heat exchanger unit and air-conditioner using the unit - Google Patents
Outdoor heat exchanger unit and air-conditioner using the unit Download PDFInfo
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- CN1103904C CN1103904C CN 97111518 CN97111518A CN1103904C CN 1103904 C CN1103904 C CN 1103904C CN 97111518 CN97111518 CN 97111518 CN 97111518 A CN97111518 A CN 97111518A CN 1103904 C CN1103904 C CN 1103904C
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Abstract
To prevent an increase in a ventilating resistance due to freezing of condensate by setting a fractal dimension on a surface of an exchanger to a specific range in a region of a cell size in box counting method to a 1 micrometer or less, and forming a hydrophobic group on a surface of a heat exchanger. When forming micron quantitative grade corrosion hole 108, a hydrophobic group 107 on the surface of a hydrated oxide layer 106 is formed with a thickness from 0.2 to 1 mu m.
Description
The present invention relates to a kind of outdoor heat exchanger unit and use the air-conditioner of this unit.
When air-conditioner is used for heating operation, the surface temperature of outdoor heat exchanger unit becomes the dew point that is lower than in the outside atmosphere, the devaporation that is comprised in the outside atmosphere is out of doors on the surface of heat exchanger and depend on that this condensate water of temperature conditions freezes, thereby increases the flowing resistance of heat exchanger.
Be head it off, a kind of technology that stops condensing water droplet to attach is disclosed, its method is to form a hydrophobic structure with respect to the outdoor heat exchanger unit fin surface, for example, this disclosed in open JP-A-3-100182 (after this being called routine techniques 1) of Japanese unexamined patent and the open JP-A-6-123575 (after this being called routine techniques 2) of Japanese unexamined patent.
According to the open material of routine techniques 1, by the boehmite film, any film in anodized aluminum film and the silicate films forms scrambling to expose hydroxyl on the aluminium surface, uses this film of fluorine containing silane compound treatment subsequently, thereby realizes hydrophilic treated.In addition, disclose hydrophilic treated best in the hydrophobic performance, it is to be realized by boehmite film and 159 ° of contact angles.
Open material according to routine techniques 2, on the face of heat exchanger heat conducting surface air side, be pre-formed the scrambling of micron number magnitude, and form by containing the siloxy group monomolecular film that chloro silicyl material constitutes, and at one end comprise the chlorosilane base subsequently and comprise that at the other end linearity fluoridizes that the chlorosilane based surfactants of carbon back is chemically adsorbed and this unit molecular film is accumulated, thereby freeze phenomenon in the face upper limit making drugs into frostlike powder of hot conducting surface air side.
Usually know simultaneously that even lip-deep hydrophobic group is identical, the contact angle of water droplet is also owing to existing or not having surface irregularity and difference.(on May 1st, 1996 was published by american chemical association according to " Langmuir ", the author is T.Onda, S.Shibuichi, N.Satoh, and K.Tsujii, the 12nd volume the 9th phase 2125-2127 page or leaf) disclosed explanation, its theoretical foundation is the relation between height hydrophobic surface and irregular tile structure, thus disclosed method applies formation height hydrophobic surface in one plane with the material with hydrophobic group beyond the fluorine compounds.According to theory disclosed herein, when the irregular fragment yardstick D of hydrophobic surface increased, contact angle was greater than the contact angle of the smooth surface with identical hydrophobic group, thus demonstration high hydrophobicity matter.
Though water droplet contact angle or anti-fog characteristics are as the appraisal reference on hydrophobic structure surface in above-mentioned routine techniques, but the drop diameter that drips when measuring contact angle is at least about 1 millimeter, therefore for saying that such as the such fine liquid particles of condensing water droplet hydrophobic performance is inadequate.
Problem of the present invention provides a kind of outdoor heat exchanger unit, and it demonstrates enough hydrophobic performances to the fine liquid particles such as condensing water droplet and prevents the increase that has been frozen into flowing resistance by condensate water.
Another problem of the present invention provides a kind of surface treatment method that is used for the heat exchanger of outdoor heat exchanger unit, so that this heat exchanger demonstrates the enough hydrophobic performances such as the fine liquid particles of condensing water droplet.
For addressing the above problem, the present inventor has experimental field prepared to stand the various aluminium test pieces of different surface treatment and test piece has been placed under the condition identical with outdoor thermal treatment unit so that the lip-deep condensing water droplet of test piece is experimentized.
Consequently they find a kind of phenomenon: have from the nanometer scale broad range to the micron number magnitude for its surface irregularity and reveal each sheet test piece that hydrophobic group is arranged simultaneously thereon, most diameter is that 500 microns or littler condensing water droplet are with adjacent water droplet is agglomerated together and the surface of disengaging perpendicular.
When the condensing water droplet on the heat-exchanger surface spontaneously breaks away from this surface, unnecessaryly carry out any operation again removing water droplet, thereby can prevent the increase of flowing resistance.
Problem of the present invention is by adopting following rule to be resolved having the outdoor heat exchanger unit that a heat exchanger and is used for the fan of heat exchanger air-supply.
(1) scope of the irregular fragment yardstick D of heat-exchanger surface is 2＜D≤3, is 1 micron or littler according to minute unit size of box-counting method in its zone, forms hydrophobic group simultaneously on heat-exchanger surface.
(2) for (1), hydrophobic group is a fluorinated organic compound.
(3) for (1) or (2), using the scope of irregular fragment yardstick D on the heat-exchanger surface that AFM measures is 2.2≤D≤3.0, is 1 micron or littler according to minute unit size of box-counting method in its zone.
(4) when operation outdoor heat exchanger unit under the dewfall condition, the diameter of 90% condensing water droplet that occurs on the heat-exchanger surface is 500 microns or littler.
(5) when operation outdoor heat exchanger unit under the dewfall condition, the condensing water droplet that forms on heat-exchanger surface breaks away from heat-exchanger surface.
(6) when operation outdoor heat exchanger unit under the dewfall condition, cohesion also breaks away from heat-exchanger surface simultaneously between the condensing water droplet that forms on the heat-exchanger surface is mutual.
(7) numerous therein heat pipes insert in the heat exchanger of numerous lamination fin, with heat pipe surface that these fin contact on form one deck insulation.
In addition, another problem of the present invention solves by following rule.
(8) the heat-exchanger surface processing method comprises the following steps: heat exchanger immersed in the treatment fluid be added with alkaline matter so that form one deck hydrated oxide film and heat exchanger is immersed in the compound solution with hydrophobic group to form hydrophobic group on heat exchanger.
(9) this method comprises the following steps: under 343K or higher temperature heat exchanger to be immersed in the treatment fluid to form one deck hydrated oxide film and heat exchanger is immersed in the compound solution with hydrophobic group to form one deck hydrophobic group.
(10) this method compound steam of comprising the following steps: to form one deck hydrated oxide film and have hydrophobic group by deposit with immersion method is to form one deck hydrophobic group.
(11) for (8), (9) or (10), when forming the hydrated oxide film, make the treatment fluid convection current.
Outdoor heat exchanger unit of the present invention is operated as follows according to these rules.
(a) scope of the irregular fragment yardstick D of heat-exchanger surface is 2＜D≤3, in its zone, it is 1 micron or littler and on heat-exchanger surface, form hydrophobic group according to minute unit size of box-counting method, therefore the condensate water on the heat-exchanger surface breaks away from heat-exchanger surface, thereby make the diameter of staying 90% condensate water on the heat-exchanger surface become 500 microns or littler, thereby avoid owing to condensate water freezes to increase flowing resistance.
An experiment discloses, according to this phenomenon, when unit size in its zone is 1 micron or littler scope by the measured irregular fragment yardstick D of AFM when being 2.2≤D≤3.0, the frequency that condensate water breaks away from the surface is accelerated thereby is prevented owing to condensate water freezes to increase flowing resistance; When irregular fragment range scale is 2.3≤D≤3.0, because nearly all condensate water all breaks away from the surface, so almost can prevent fully owing to condensate water freezes to increase flowing resistance, and when condensate water on the heat-exchanger surface partly contacted with each other and condense mutually, the condensate water break-off promptly took place.
Dividing the box-counting method is a kind of method that is used for calculating irregular fragment yardstick D on curved surface, and its detailed introduction will provide in following.
From experiment as can be known, if the scope of the irregular fragment yardstick D of heat-exchanger surface is 2＜D≤3 is 1 micron or littler and form hydrophobic group on heat-exchanger surface according to minute unit size of box-counting method in its zone simultaneously, then condensate water part cohesion and break away from heat-exchanger surface mutually on the heat-exchanger surface.
In addition, hydrophobic group is carried out affirming after the different experiments:, then can accelerate the frequency of condensate water break-off if hydrophobic group comprises fluorinated organic compound.Sometimes in experiment with silane compound and polymer as fluorinated organic compound, anyly among both all produce similar effect.
(b) by on the heat pipe surface that contacts with fin, forming dielectric film, can prevent the direct contact of different metal, thereby prevent galvano-cautery and improve anti-corrosion capability.By plastic substance is used as dielectric film, can reduces the air layer that on the contact-making surface of heat pipe and fin, occurs usually, thereby reduce thermal contact resistance.
Following the carrying out of heat-exchanger surface processing method according to outdoor heat exchanger unit of the present invention.
(c) this method may further comprise the steps: heat exchanger is immersed in the treatment fluid that is added with alkaline matter to form one deck hydrated oxide film and heat exchanger is immersed in the compound solution with hydrophobic group to form one deck hydrophobic group, making the scope of the irregular fragment yardstick D of heat-exchanger surface thus is 2＜D≤3, in its zone, be 1 micron or littler and further formation one deck hydrophobic group on heat-exchanger surface according to minute scope of the unit size of box-counting method, therefore the diameter of staying 90% condensate water on the heat-exchanger surface becomes 500 microns or littler, thereby prevents to freeze to increase flowing resistance owing to condensate water.
For example, ammonia, carbonate, oxalates, monoethanolamine, hydrazine and similar material are the alkaline matters that adds treatment fluid.
Not to treatment fluid add alkaline matter and under 343K or higher temperature heat treated liquid, also can obtain similar effect.
(d) make the treatment fluid convective flow when forming the hydrated oxide film, the gas that is produced in the time of can preventing to form the hydrated oxide film is trapped in the gap location of heat exchanger fin, thereby quickens the formation of hydrated oxide film.The convection current means can be thought of as the forced convection of treatment fluid, and the vibration of heat exchanger is put in the liquid bottom to produce free convection etc. in treatment fluid with heater.
Fig. 1 is the principle profile that shows the air-conditioner of the embodiment of the invention.
Fig. 2 (a) is the perspective view that shows the outdoor heat exchanger unit of the embodiment of the invention, and Fig. 2 (b) is the schematic diagram of the amplification of fin 103 a part of sections.
Fig. 3 is the electron micrograph that shows the fin surface with hydrophobic performance of the embodiment of the invention.
Fig. 4 is the electron micrograph that shows the fin surface with hydrophobic performance of the embodiment of the invention.
Fig. 5 is the enlarged photograph that shows the condensing water droplet on the fin surface with hydrophobic performance of the embodiment of the invention.
Fig. 6 (a), 6 (b) and 6 (c) are the cohesion of condensing water droplet on the demonstration embodiment of the invention and the fin surface with hydrophobic performance and the schematic diagram of decoupling mechanism.
Fig. 7 is when the electron micrograph of fin surface during unmixed additives in the treatment fluid.
Fig. 8 is the information drawing that forms the hydrated oxide film in the embodiment of the invention when adding ammonia in the treatment fluid.
Fig. 9 is the information drawing that forms the hydrated oxide film in the embodiment of the invention when adding sodium oxalate in the treatment fluid.
Figure 10 is the information drawing that forms the hydrated oxide film in the embodiment of the invention when adding sodium carbonate in the treatment fluid.
Figure 11 (a) and 11 (b) are the figure that is used to explain branch box-counting method.
Figure 12 is the measurement category dependence of the irregular fragment yardstick D on heating sheet surface in the embodiment of the invention.
Being explained as follows of the embodiment of the invention.
Fig. 1 shows that the present invention shows the principle profile of the air-conditioner of example.
Air-conditioner is by 1, one outdoor heat exchanger unit 101 of an indoor heat exchange unit and the cooling agent that is connected these unit pipeline 4 and 4 '.Indoor heat exchange unit 1 is made up of a heat exchanger 2 and fan 3, and outdoor heat exchanger unit 101 is made up of the heat exchanger 8 and the fan 9 of waterproof.Though be provided with compressor 5 and expansion valve 6 in the heat exchange unit 101 out of doors under many circumstances, with this schematic diagram display unit appearance so that understand.
Fig. 2 (a) is the perspective view of partly cutting open that shows the outdoor heat exchanger unit of the embodiment of the invention.
Outdoor heat exchanger unit 101 is made up of a heat exchanger and a fan 104, and numerous heat pipes 102 insert numerous lamination fin 103 orthogonally in the heat exchanger.
Fig. 2 (b) is the amplification principle figure of fin 103 a part of sections.
According to present embodiment, to form a layer thickness on as aluminium sheet 105 surfaces of substrate be 0.2 to 1 micron hydrated oxide layer 106 and one deck hydrophobic group 107 is arranged thereon.Though on aluminium sheet 105, formed some etch pits 108, hydrated oxide layer 106 and hydrophobic group 107 still arranged in etch pit 108 inside.
Then explain the surface treatment method of heat exchanger.
At first, the heat exchanger that has heat pipe 102 and a fin 103 immersed under the 333K temperature in the basic degreasant solution 10 minutes, thereby removed the rust staining on the heat-exchanger surface.Secondly the aqueous solution of the 0.4wt% ammonia that immersion is boiled after the flushing of heat exchanger water is 10 minutes, thereby forms one deck hydrated oxide film on fin 103 surfaces.Preferably vibrate heat exchanger this moment or force treatment fluid to flow and be trapped in gap location between heat exchanger fin to prevent to react the gas that produced.It also is effective that heater is placed in the way that flows with the free convection that produces treatment fluid the treatment fluid bottom.After this water washes heat exchanger and makes it dry.In drying steps, blow to heat exchanger and do not destroy the crystal structure of hydrated oxide film, can shorten drying time with hot blast.In subsequent fluoroalkyl silane (structural formula CF3 (CF2) 7 (CH2) 201 (OCH3) 3) solution that heat exchanger is immersed 3wt% perfluor alkane (structural formula C8F18) 30 minutes, under normal temperature dry 30 minutes and under the 413K temperature dry 30 minutes.
According to the normal method of measuring contact angle, the fin surface contact angle that obtains with this surface treatment method is 160 ° or bigger.
When measuring irregular fragment yardstick D in the scope of AFM (Digital Instruments Co., the made NanoscopeIIIa of Ltd.), demonstrate the result of D 〉=2.2 and D 〉=2.3 at least under most of situation in 10 nanometers to 1 micron.Irregular fragment yardstick D is a numerical value of representing the surface irregularity degree, is 2 to 3 for the scope of this value of curved surface, but the detailed description to it below will be arranged.
When as above describe the heat exchanger of making on ground integrally pack in the actual outdoor heat exchanger unit and carry out heating operation simultaneously when the water droplet that on fin surface, form very hour, according to the air-flow that fan causes, these water droplets scatter downstream.The diameter of these water droplets is very little, even therefore also realize supercooling easily under congealing point, thereby possesses the advantage that is difficult for forming frost on conducting surface.Correspondingly can limit increase by water droplet or white caused heat exchanger flowing resistance.
For the treatment fluid additives in being used in above-mentioned processing, can use carbonate, oxalates, triethanolamine, the combination of hydrazine and saline solution and magnesium ion and hydrogen carbonate ion, magnesium ion, the combination of hydrogen carbonate ion and sulphion, the combination of hydroxyl ion and lithium ion, the combination of hydroxyl ion, lithium ion and silicate ion, the combination of hydroxyl ion and calcium ion, hydroxyl ion, the combination of lithium ion and sodium ion and similar material replace ammonia.
In addition, in above-mentioned processing, use the thermal purification water treatment liquid under 343K or the higher temperature, also can obtain similar effect.
Also having, will more effective with fluoroalkyl silane vapor deposition on heat-exchanger surface under the 443K temperature.
Fig. 3 is the electron micrograph of the fin surface with hydrophobic performance of heat exchanger in the embodiment of the invention.Multiplication factor is 30000.The aqueous solution of 0.4wt% ammonia is as the treatment fluid that forms the hydrated oxide film.The white portion of this photo shows the linea angulata of the hydrated oxide film 106 that exposes on the fin surface, and size is about tens of to 100 nanometers.Sometimes do not observe the hydrophobic group 107 on the fin surface on the photo.
Fig. 4 is the electron micrograph of fin surface under 1000 multiplication factors observed among Fig. 3.Black part is divided the pit that indicates the micron number magnitude in the photo, and they are seemingly caused by pit corrosion.These are corresponding to the etch pit of describing among Fig. 2 (b) 108.
In this way, hydrated oxide layer 106 is formed on the etch pit scrambling of nanoscale to the micron order scope on fin surface.This is to expose hydrophobic group on so-called irregular tile structure and this outer surface, so shows extraordinary hydrophobic performance on the heat exchanger fin surface.
Fig. 5 is the enlarged photograph example with condensing water droplet on the fin surface of hydrophobic performance of the present invention.
This photo is clapped in the following cases: paste the aluminium sheet of handling with the method that is similar to an above-mentioned heat exchanger processing method (A1100 on the heat-absorbent surface of the thermoelectric cooling element of vertically installing, 25 * 50 * 3 millimeters), then aluminium sheet be cooled to 273K and around temperature be that 298 ° of K and humidity are the stable state that enters free convection under 60% the situation.Find to occur following phenomenon constantly in the process of taking a picture: form very little condensing water droplet on surface of aluminum plate, these water droplets condense and substantially perpendicularly break away from this surface.According to present embodiment, just the diameter of most of condensing water droplet is 10 to 50 microns to stay lip-deep condensing water droplet diameter range is several microns to 500 microns in cohesion and before breaking away from.
This phenomenon does not appear at all the time on the hydrophobic structure surface with 120 ° of contact angles but appears at more frequently on the following surface: the scope of the high irregular fragment yardstick D that this surface has is that nanometer scale exists highdensity hydrophobic group to micron number magnitude and surface.
As if the cohesion of condensing water droplet and break-off based on following principle.
Fig. 6 (a), 6 (b) and 6 (c) principle ground show tiny condensing water droplet cohesion that forms and the performance that breaks away from fin surface on fin surface when the fin surface cooling that has hydrophobic performance and vertically install.Moment condenses and drip 221 by water of water droplet state 211 (Fig. 6 (b)) formation breaks away from fin surface (Fig. 6 (c)) to the condensing water droplet 201 and 202 (Fig. 6 (a)) of last two vicinities in fin 203 surface contact.Radius when water droplet 201,202 and 221 is denoted as r1, r2 and R, and the water droplet surface tension is designated as σ, and the water droplet adhesion energy sum with respect to fin surface before the cohesion is designated as E
aAnd as the cohesion result and the kinetic energy of the water droplet that forms when being designated as EK, the utilisable energy law of conservation is set up following formula.
Ek=4 π σ (r1
2+ r2
2-R
2It is that the little kinetic energy Ek that reaches is caused by cohesion institute that)-Ea can find to adhere to energy Ea from top formula.
When water droplet quality and second cosmic velocity are denoted as M and V after the cohesion, can set up following formula.
Ek=MV
2/ 2M and r3 are proportional proportional with Ea and r2, so V
2With r
-1Proportional.Also promptly, water droplet heal little then more easily break away from and second cosmic velocity sooner.
Fig. 7 does not mix any additives in the treatment fluid that forms the hydrated oxide film, promptly use the electron micrograph of fin surface when purifying waste water formation hydrated oxide film yet.Multiplication factor is 1000.When Fig. 7 is compared with the Fig. 4 that mixes additives in treatment fluid, can find the less scrambling that does not form the micron number magnitude that reaches of etch pit among Fig. 7.Similarly, when use multiplication factor be 30000 electron micrograph comparison they the time be not aware of difference therebetween.Therefrom can find in treatment fluid to mix the scrambling of more micron number magnitudes appears under the situation of additives and except that the scrambling of the nanometer scale that hydrated oxide occurs formed scrambling have more wide region.
Fig. 8, Fig. 9 and Figure 10 show that respectively acquisition has the condition of fine dewatering fin when comprising ammonia, sodium oxalate and sodium carbonate as additives in the treatment fluid that is being used to form the hydrated oxide film, and wherein abscissa indicates additives concentration and ordinate sign dip time.
For example,, fin immersed in the treatment fluid with 0.5wt% concentration sodium oxalate 10 minutes or longer, can obtain good hydrophobic performance when sodium oxalate as shown in Figure 9 during as additives.By the way, the pH value of treatment fluid is 7.96 in this example.
Fine hydrophobic performance is considered to following state: the condensate water on the fin surface is similar all to break away from, even the condensate water of staying on the fin surface is freezed also can not influence flowing resistance, the diameter of 90% condensing water droplet on the fin surface is 500 microns or littler particularly.Its reason is substantially perpendicularly to be installed with and to be cooled to air dew point if having the fin surface of hydrophobic performance, then repeatedly condenses under stable state and breaks away from 500 microns or littler condensing water droplet on the fin surface.
Herein will be to explaining as the branch box-counting method of one of method of calculating irregular fragment yardstick D.
Divide the process of box-counting method as follows.
(1) curve that calculates its irregular fragment yardstick D wrap with square unit (square box) and will with the element count of curve intersection.
(2) change unit size and be similar to (1) will with the element count of curve intersection.
(3) draw data with log-log coordinate, with unit size as abscissa and the element number that intersects as ordinate.
(4) slope absolute value of the figure that forms in (3) constitutes irregular fragment yardstick D.When the object of line was straight line, when reducing by half as unit size, the quantity that intersects the unit doubled, thereby irregular fragment yardstick D becomes 1.
When the object of line was curve, irregular fragment yardstick D became 1 or bigger.
The curve that calculates its irregular fragment yardstick D among the figure of Figure 11 (a) is drawn the curve that calculates its irregular fragment yardstick D among the figure of top shadow line and Figure 11 (b) by the grid encirclement that is X/2 of its every edge lengths and the grid quilt stroke top shadow line of covering curve by the grid of grid encirclement that is X of its every edge lengths and covering curve.
Under the situation of curve shown in Figure 11 (a) and 11 (b), when as shown in the figure the grid size being reduced by half, increase to 26 by 12 with the number of squares of curve intersection, also, it outnumbers and doubles, and therefore irregular in this case fragment yardstick D is 1 or bigger.
Grid becomes cube when this thinking methods is extended to curved surface.When curved surface is the plane, as the cube size is reduced by half, then the cube quantity of Xiang Jiaoing be original quantity multiply by 4 and irregular fragment yardstick D become 2.In addition, under the situation of arbitrary surface, it is 2 or more that the situation that can be similar to curve is calculated its irregular fragment yardstick D.
From above thinking methods as can be known, the value of the irregular fragment yardstick D of curved surface be 2 to 3 and curve form heal the then irregular fragment yardstick of complexity Yu near 3.
The situation of Figure 12 is that the treatment fluid that is used to form the hydrated oxide film is when the aqueous solution of 0.5wt% sodium oxalate and processing time being 10 minutes, the irregular fragment yardstick D on hydrophobic structure surface is recorded in the different measuring scope by AFM, and is abscissa with every edge lengths in the measurement category when drawing measurement result and is ordinate with the interior irregular fragment yardstick D of measurement category.According to this figure as can be known, when increasing resolution ratio when reducing measurement category, the value that irregular fragment yardstick D increases and irregular fragment yardstick D is made as D 〉=2.2 in 6 microns or littler measurement category then is made as D 〉=2.3 in 1 micron or littler measurement category.Also be, fin surface with hydrophobic performance of the present invention also has complicated shape aspect the nanometer scale scrambling, can expect that therefore this surface not only shows hydrophobic performance but also more tiny condensing water droplet is also had cohesion and break-off about 1 millimeter water droplet.
Though now in the heat exchanger heat pipe, use copper product and in fin, use aluminum, thereby after both contact-making surface places provide dielectric film, can avoid copper to prevent galvano-cautery and improve anti-corrosion capability with direct contact of aluminium according to present embodiment.In addition, by plastic substance is used as dielectric film, can make the air layer that is present in usually on heat pipe and the fin contact-making surface reduce to minimum, thereby make thermal contact resistance reduce to minimum.
Sometimes can only make all heat exchangers to solve the galvano-cautery problem that directly contacts between above-mentioned different metal and cause with aluminium.In the case, thus fin is welded to makes thermal contact resistance reduce to minimum on the heat pipe easily.In addition, can not only form hydrophobic membrane on the fin but also on the heat pipe surface.
Though in manufacturing step, need on above-mentioned fin surface, form irregular tile structure to show hydrophobic performance with several hydrated oxide bases, but this structure is not limited to the hydrated oxide structure of above-mentioned aluminium and can be used for for example glass, and its main component is quartz and the organic substance with hydrated oxide base.
According to the invention provides a kind of outdoor heat exchanger unit, even it also demonstrates enough hydrophobic performances for the fine liquid particles of for example condensing water droplet and can prevent the increase of the flowing resistance freezing to cause owing to condensate water.
Can provide a kind of being used for that the heat exchanger that heat exchange unit out of doors uses is carried out the surface-treated method in addition according to the present invention, so that this heat exchanger demonstrates enough hydrophobic performances for the fine liquid particles of for example condensing water droplet.
Claims (5)
1. outdoor heat exchanger unit comprises:
Heat exchanger;
The fan that is used for the heat exchanger air-supply; And
Wherein the scope of the irregular fragment yardstick D on the heat-exchanger surface is 2＜D≤3, is 1 micron or compound littler and form one deck fluoroalkyl silane on heat-exchanger surface according to minute unit size of box-counting method in its zone.
2. according to the outdoor heat exchanger unit of claim 1, wherein the scope of the irregular fragment yardstick D of the heat-exchanger surface of measuring with AFM is 2.2≤D≤3.0, is 1 micron or littler according to minute unit size of box-counting method in its zone.
One kind for outdoor heat exchanger unit with the surface treatment method of heat exchanger, may further comprise the steps:
With heat exchanger immerse added below wherein in a kind of treatment fluid of material to form one deck hydrated oxide film:
Ammonia, carbonate, oxalates, triethanolamine, the combination of hydrazine and saline solution and magnesium ion and hydrogen carbonate ion, magnesium ion, the combination of hydrogen carbonate ion and sulphion, the combination of hydroxyl ion and lithium ion, the combination of hydroxyl ion, lithium ion and silicate ion, the combination of hydroxyl ion and calcium ion, perhaps hydroxyl ion, the combination of lithium ion and sodium ion;
And heat exchanger immersed in the compound solution with fluoroalkyl silane to form one deck hydrophobic group.
4. according to the surface treatment method of claim 3, wherein when forming the hydrated oxide film, the temperature of handling compound solution is 343K.
5. according to the surface treatment method of claim 3, Treatment Solution convective flow when forming the hydrated oxide film wherein.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13971796 | 1996-05-10 | ||
| JP139717/1996 | 1996-05-10 | ||
| JP139717/96 | 1996-05-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1170125A CN1170125A (en) | 1998-01-14 |
| CN1103904C true CN1103904C (en) | 2003-03-26 |
Family
ID=15251779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97111518 Expired - Fee Related CN1103904C (en) | 1996-05-10 | 1997-05-09 | Outdoor heat exchanger unit and air-conditioner using the unit |
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| Country | Link |
|---|---|
| CN (1) | CN1103904C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2750831C1 (en) * | 2020-11-23 | 2021-07-05 | федеральное государственное бюджетное образовательное учреждение высшего образования "Национальный исследовательский университет "МЭИ" (ФГБОУ ВО "НИУ "МЭИ") | Method for forming hydrophobic texture on metal surface |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10227135A1 (en) * | 2002-06-18 | 2004-01-08 | BSH Bosch und Siemens Hausgeräte GmbH | Evaporator for a refrigerator |
| US11181404B2 (en) | 2019-09-05 | 2021-11-23 | Micro Motion, Inc. | Magnetic flowmeter with a current sampling circuit sampling coil current pulses at a sampling frequency |
| US11204267B2 (en) | 2019-09-05 | 2021-12-21 | Micro Motion, Inc. | Continuously adaptive digital coil driver for magnetic flowmeter |
| US11204268B2 (en) | 2019-09-05 | 2021-12-21 | Micro Motion, Inc. | Magnetic flowmeter having a programmable bi-directional current generator |
| US11333537B2 (en) | 2019-09-05 | 2022-05-17 | Micro Motion, Inc. | Load leveling boost supply for magnetic flowmeter |
-
1997
- 1997-05-09 CN CN 97111518 patent/CN1103904C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2750831C1 (en) * | 2020-11-23 | 2021-07-05 | федеральное государственное бюджетное образовательное учреждение высшего образования "Национальный исследовательский университет "МЭИ" (ФГБОУ ВО "НИУ "МЭИ") | Method for forming hydrophobic texture on metal surface |
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| Publication number | Publication date |
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| CN1170125A (en) | 1998-01-14 |
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