CN1584483A - Nanometer coating on coiler surface of heat exchanger - Google Patents
Nanometer coating on coiler surface of heat exchanger Download PDFInfo
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- CN1584483A CN1584483A CN 200410027294 CN200410027294A CN1584483A CN 1584483 A CN1584483 A CN 1584483A CN 200410027294 CN200410027294 CN 200410027294 CN 200410027294 A CN200410027294 A CN 200410027294A CN 1584483 A CN1584483 A CN 1584483A
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Abstract
Nano coatings on coiled pipelines for heat exchangers consist of a corrosion-proof layer, a hydrophilic film, and a heat transferring film between the formers. An evaporative heat exchanger equipped with such pipelines works with high efficiency and saves water. It modifies surface characteristics of materials to make water film thinner, distributed more uniformly to have largest areas per unit of water so as to eliminate dry spots occurred and to reduce scales formed on surface of the coiled pipelines.
Description
Technical field
The present invention relates to hot swapping, the nano-hydrophilic coating of evaporating heat exchanger coil surface special use specifically.
Background technology
Existing evaporating heat exchanger has evaporative type cooler, evaporative condenser, remover for surface evaporation type air cooling, and its basic structure as shown in Figure 1.Mainly constitute by heat exchange coil 1, water-distributing device 6, blower fan 4, shelves water plate 5, water circulating pump 7, air-inlet grille 2, water leg 3.During evaporation work, cooling water in the water leg 3 is delivered to water-distributing device 6 by water circulating pump 7, spray is on heat exchange coil 1 surface, form moisture film, exchange working medium condensation or the cooling that makes in the heat exchange coil 1 through sensible heat and latent heat, the part water evaporates becomes steam to vapor away, and remaining water drops in the water leg 3 and recycles.As seen, evaporating heat exchanger mainly is to utilize moisture to conduct heat in the evaporation on heat exchange coil 1 surface.
The heat exchange coil structure of existing evaporating heat exchanger as shown in Figure 2.Mainly by the decisions such as temperature, pressure and corrosivity of intraductal working medium, the material of using morely is red copper and carbon steel to tubing.Cast can be intensify heat transfer pipes such as smooth pipe, smooth elliptical tube, smooth flat tube and finned tube.The above cast mostly is the single face wet tube, shower water can't spray coil all surfaces and in time replenish the moisture that evaporates, so not only the coil pipe effective area is used insufficiently, but also formed " dry spot ", easily fouling and influence heat transfer property and equipment life at tube-surface.On the other hand, fully wetting for making coil surface, water spray strengthens, and air drag increases, and blower fan and pump energy consumption increase, and the evaporating heat exchanger operating cost increases.
Summary of the invention
The objective of the invention is to, shortcoming at the existing technical existence of evaporating heat exchanger, the evaporating heat exchanger coil surface is handled, a kind of coil surface nano coating of heat exchanger is provided, evaporating heat exchanger with coil pipe making of this coating, the heat exchanger effectiveness height, the good and water saving of refrigeration.The present invention makes shower water thinner at the moisture film of coil surface by changing the surface characteristic of material, is more evenly distributed, and area maximum under the unit water yield is avoided the generation of " dry spot ", reduces and delay the fouling on heat exchange coil surface.
The coil surface nano coating structure of heat exchanger of the present invention is on coil pipe 1 surface anticorrosive coating 1-1, hydrophilic membrane 1-2 successively as shown in Figure 3.
In order to strengthen heat-transfer effect, the present invention can also be at coil pipe 1 surface anticorrosive coating 1-1 successively, heat transfer layer 1-3, hydrophilic membrane 1-2.Promptly between anticorrosive coat 1-1 and hydrophilic membrane 1-2, increase heat transfer layer.
The method of the coating of described coating can be existing method in common, for example infusion process, spraying process, spread coating, magnetron sputtering method etc.
The tubing of heat exchanger coils of the present invention can be copper, steel, titanium etc.; Cast can be smooth pipe, smooth elliptical tube, smooth flat tube and finned tube etc.
Heat-transfer effect the best when described anticorrosive coat thickness 2-15nm, nano hydrophilic film 8-35nm.
Increasing under the situation of heat transfer layer heat-transfer effect the best when described heat transfer layer thickness is 2～10nm between anticorrosive coat 1-1 and the hydrophilic membrane 1-2.
The main component of described hydrophilic membrane is general nano-hydrophilic resin;
Anticorrosive coat can adopt general nano anti-corrosive material, for example sodium phosphate.
Heat transfer layer can adopt general heat-transfer matcrial, for example contains the fused solution of metallic zinc.
Advantage of the present invention is:
(1) can make moisture film at the contact angle on heat exchange coil surface less than 10 °, thereby make shower water can effectively encase all surface of heat exchange coil, eliminate " dry spot " phenomenon, make water, air and intraductal working medium carry out effectively sufficient heat exchange;
(2) hydrophilic membrane makes moisture film thinner at tube-surface, is more evenly distributed, and area maximum under the unit water yield can economize on water 12%～25%;
(3) contain anticorrosive coat in the nano-hydrophilic coating, eliminate and slowed down the corrosion of water, improved service life tubing;
(4) contain heat transfer layer in the nano-hydrophilic coating, can improve the heat conductivility as tubing such as carbon steel, titaniums, heat transfer coefficient is increased, thereby improves heat-transfer effect;
(5) under equal heat exchange area and same operation condition, nano-hydrophilic heat exchange coil evaporating heat exchanger can improve heat exchange efficiency 15%～30%.
Description of drawings
Fig. 1 is an evaporating heat exchanger contour structures schematic diagram;
Fig. 2 is the structural representation of the coil pipe among Fig. 1;
Fig. 3 is the A-A cutaway view of coil pipe among Fig. 2.
The specific embodiment
As shown in Figure 1, be the basic contour structures of evaporating heat exchanger, mainly constitute by heat exchange coil 1, water-distributing device 6, blower fan 4, shelves water plate 5, water circulating pump 7, air-inlet grille 2, water leg 3.Heat exchange coil is installed between water-distributing device 6 and the air-inlet grille 2, walks working medium in the pipe, the outer air stream that shower water and forced flow are arranged of pipe, and tube-surface forms water membrane.
As shown in Figure 2, be a kind of structure chart of evaporating heat exchanger coil pipe 1, its cast is a smooth pipe.
Making the solution of nano-hydrophilic coating can make with the organic or inorganic resin, as polyvinyl alcohol.Mainly contain phosphate in the working solution of making anticorrosive coat, as sodium phosphate.Can contain additives such as silica, polyoxyethylene alkyl ether in the resin of making hydrophilic membrane.Make heat transfer layer; for mainly containing the fused solution of metallic zinc; zinc adds in the nano-hydrophilic coating can have improved corrosion resistant coating in the generation of parent tube surface; simultaneously can make parent tube have zinc-plated protective effect; the thermal conductivity factor of zinc is big than some metal such as carbon steel; and be far longer than the thermal conductivity factor of organic substance, strengthened heat transfer to a certain extent.
According to actual needs, choose two layers or three-decker after, apolegamy nano-hydrophilic coating solution.Untreated heat exchange coil is at first preferably used acidity or alkaline detergent, in washing agent, add some slaine or metal acid-salt simultaneously.Then, adopt chromic acid chromium hydrochlorate, chromium phosphate hydrochlorate or chromium-free treatment agent to carry out antirust processing.At last, adopt infusion process, spraying process, spread coating or magnetron sputtering method, the heat exchanging coil surface is carried out the nano-hydrophilic processing.Select for use magnetron sputtering method can obtain stabilized uniform nano-hydrophilic coating more, but because heat exchange coil is complex-shaped, so preferred infusion process.After the hydrophilic treated, at 100～250 ℃, preferred 150～200 ℃ temperature lower calcination 10～60 minutes can obtain the heat exchange coil of surface-coated nano-hydrophilic film.
Adopt the circular coil pipe of carbon steel, apply and obtain coating structure shown in Figure 3, wherein the thickness of hydrophilic membrane 1-2 for get 8,15 respectively, 35nm, the thickness of anticorrosive coat 1-1 gets 2,10 respectively, 15nm, the thickness of heat transfer layer 1-3 gets 2,5 respectively, 10nm.The gross thickness of the three-decker coating that obtains is 12,30,60nm.
Experiment shows, the coil surface nano coating surface of the heat exchanger that this is routine, and contact angle is reduced to 8 °, 2 °, 6 ° by 40 °, 35 °, 38 ° of existing coil pipe light pipe.Evaporating heat exchanger adopts the heat exchange coil that this routine coating is arranged, and water saving is respectively 13%, 23%, 18%, and heat transfer property improves 18%, 30%, 22% relatively.
Adopt copper coin shape coil pipe, apply and obtain two-layer coating structure, wherein the thickness of hydrophilic membrane 1-2 for get 8,15 respectively, 35nm, the thickness of anticorrosive coat 1-1 gets 2,10 respectively, 15nm.The gross thickness of the two-layer structure coating that obtains is 10,25,50nm.
Experiment shows, the coil surface nano coating surface of the heat exchanger that this is routine, and contact angle is reduced to 9 °, 3 °, 5 ° by 38 °, 36 °, 40 ° of existing coil pipe light pipe.Evaporating heat exchanger adopts the heat exchange coil that this routine coating is arranged, and water saving is respectively 12%, 25%, 20%, and heat transfer property improves 15%, 28%, 21% relatively.
Claims (4)
1, a kind of coil surface nano coating of heat exchanger is characterized in that being coated with anticorrosive coat, hydrophilic membrane successively in coil surface.
2, the coil surface nano coating of heat exchanger according to claim 1 is characterized in that being coated with heat transfer layer between anticorrosive coat and hydrophilic membrane.
3, the coil surface nano coating of heat exchanger according to claim 1 and 2 is characterized in that described anticorrosive coat thickness 2-15nm, nano hydrophilic film 8-35nm, heat transfer layer thickness are 2～10nm.
4, the coil surface nano coating of heat exchanger according to claim 1 and 2 is characterized in that described coil pipe is tubular and is smooth pipe, smooth elliptical tube, smooth flat tube or finned tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410027294 CN1584483A (en) | 2004-05-24 | 2004-05-24 | Nanometer coating on coiler surface of heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410027294 CN1584483A (en) | 2004-05-24 | 2004-05-24 | Nanometer coating on coiler surface of heat exchanger |
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| Publication Number | Publication Date |
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| CN1584483A true CN1584483A (en) | 2005-02-23 |
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| CN 200410027294 Pending CN1584483A (en) | 2004-05-24 | 2004-05-24 | Nanometer coating on coiler surface of heat exchanger |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100437013C (en) * | 2006-03-07 | 2008-11-26 | 天津大学 | Heating tube with nanometer coating on internal surface and evaporator |
| CN101655334A (en) * | 2009-09-07 | 2010-02-24 | 浙江正理生能科技有限公司 | Nano hydrophilic film for evaporator in air source heat pump water heater and manufacturing method thereof |
| CN102492322A (en) * | 2011-12-09 | 2012-06-13 | 华东理工大学 | Nano-coating for unsaturated evaporation heat transfer surface |
| CN104596342A (en) * | 2013-11-01 | 2015-05-06 | 成信绿集成股份有限公司 | Heat exchange fin for heat exchanger and film type heat exchange plate |
| CN110332733A (en) * | 2019-05-09 | 2019-10-15 | 上海应用技术大学 | A kind of downward film evaporator and centrifugal water chillers |
-
2004
- 2004-05-24 CN CN 200410027294 patent/CN1584483A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100437013C (en) * | 2006-03-07 | 2008-11-26 | 天津大学 | Heating tube with nanometer coating on internal surface and evaporator |
| CN101655334A (en) * | 2009-09-07 | 2010-02-24 | 浙江正理生能科技有限公司 | Nano hydrophilic film for evaporator in air source heat pump water heater and manufacturing method thereof |
| CN102492322A (en) * | 2011-12-09 | 2012-06-13 | 华东理工大学 | Nano-coating for unsaturated evaporation heat transfer surface |
| CN104596342A (en) * | 2013-11-01 | 2015-05-06 | 成信绿集成股份有限公司 | Heat exchange fin for heat exchanger and film type heat exchange plate |
| CN104596342B (en) * | 2013-11-01 | 2017-01-11 | 成信绿集成股份有限公司 | Heat exchange fin for heat exchanger and film type heat exchange plate |
| CN110332733A (en) * | 2019-05-09 | 2019-10-15 | 上海应用技术大学 | A kind of downward film evaporator and centrifugal water chillers |
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