CN213120173U - Heat exchange structure and heat exchanger - Google Patents
Heat exchange structure and heat exchanger Download PDFInfo
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- CN213120173U CN213120173U CN202021851423.1U CN202021851423U CN213120173U CN 213120173 U CN213120173 U CN 213120173U CN 202021851423 U CN202021851423 U CN 202021851423U CN 213120173 U CN213120173 U CN 213120173U
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Abstract
The application relates to the technical field of heat exchangers, and discloses a heat exchange structure and a heat exchanger, the heat exchange structure comprises a plurality of parallel fins and a plurality of fins, wherein the fins and the plurality of fins are arranged side by side and vertically run through the tube bundles of the fins, the fins or the fins and the surfaces of the tube bundles are provided with super-hydrophobic coatings, and the super-hydrophobic coatings comprise hydrophobic nano-particles and hydrophobic resin. The defrosting device can reduce defrosting energy consumption and defrosting time, so that the heat exchanger can work without stop, and meanwhile, the corrosion on the surface of the heat exchanger is delayed and reduced.
Description
Technical Field
The application relates to the technical field of heat exchangers, in particular to a heat exchange structure and a heat exchanger.
Background
The heat exchanger, especially the heat exchanger that cools air, can adsorb the moisture in the humid air at the heat exchanger surface in the cooling process, when the literary sketch on heat exchanger surface drops to below humid air dew point temperature, the humid air begins to condense at the heat exchanger surface, after condensing enough many moisture, can fall with the form of comdenstion water from the heat exchanger surface, reaches below 0 ℃ in the heat exchanger internal temperature, and the comdenstion water is when piling up too much on the heat exchanger surface, then can be at the heat exchanger surface frost. Excessive frost between heat exchange surfaces of the heat exchanger can reduce heat exchange efficiency and improve pressure drop, and when frost is formed between the heat exchange surfaces and completely blocks wind passing, the heat exchanger needs to be defrosted completely.
In the related art, there is a method for increasing the amount of frost formation that can be carried by a heat exchanger by increasing the distance between heat exchange surfaces. When the inlet air temperature is lower than 0 degree in the use working condition of the heat exchanger, the heat exchanger with different heat exchange surface intervals can be configured according to the use working condition, so that the defrosting frequency which is the same as the higher temperature can be achieved in the low-temperature environment with higher frosting speed, but the heat exchange area and the heat exchange efficiency of the heat exchanger with the same size can be reduced by the mode.
There is also a related art to defrost a heat exchanger by means of active defrosting. The active defrosting mode comprises the following steps: the defrosting method comprises the following steps of defrosting by an electric heating pipe, hot defrosting, glycol (propylene glycol) defrosting and water defrosting, wherein the defrosting effect is realized by heating a heat exchanger. However, the active defrosting method requires intermittent shutdown of the heat exchanger, which results in loss of heat exchange efficiency during the shutdown period and use of a large amount of energy consumption, and the heat generated by defrosting also affects the working environment of the heat exchanger. In addition, the water defrosting mode increases the environmental humidity and is limited by the environmental temperature of the heat exchanger, and the water defrosting mode cannot be used in the environment with too low temperature.
Disclosure of Invention
In order to reduce defrosting power consumption and defrosting time, reach the effect of passive frost prevention, reduce the influence to heat transfer area and heat exchange efficiency simultaneously, this application provides a heat transfer structure and heat exchanger.
On the one hand, the heat exchange structure that this application provided includes following technical scheme:
the heat exchange structure comprises a plurality of parallel fins arranged side by side and a plurality of tube bundles vertically penetrating through the fins, wherein a super-hydrophobic coating is arranged on the surfaces of the fins or the fins and the tube bundles, and the super-hydrophobic coating comprises hydrophobic nano-particles and hydrophobic resin.
By adopting the technical scheme, the super-hydrophobic coating is arranged on the heat exchange surface of the heat exchange structure, so that the surface of the heat exchange surface has the performance of easier deicing, the heat exchanger realizes the effect of non-stop work, the defrosting pipeline or the defrosting frequency is greatly reduced, and in addition, the corrosion of the surface of the heat exchange structure is delayed and reduced; the super-hydrophobic coating agent has stronger adhesive property, and the coating can not fall off in the long-term use process.
In some embodiments, the superhydrophobic nanoparticles are aluminum oxide particles.
The surface of the super-hydrophobic coating is mainly made of aluminum, and by adopting the technical scheme, the aluminum oxide serving as the super-hydrophobic nano particles on the aluminum material is more favorable for maintaining the long-term adhesiveness of the aluminum material, and in addition, the aluminum oxide is more favorable for heat transfer, and the heat transfer efficiency cannot be influenced by using the coating.
In some embodiments, the superhydrophobic nanoparticle has a particle size of-nm.
If the particle is too small, a rough surface cannot be formed, and if the particle is too large, hydrophobicity is affected.
In some embodiments, the hydrophobic resin is a silicone resin.
The organic silicon resin has the strongest hydrophobic property, and the technical scheme is adopted, so that the nano material is better synergistic.
In some embodiments, the fin surface has a stable contact angle of 150 ° or more and a rolling contact angle of 10 ° or less.
By adopting the technical scheme, the stable contact angle of 150 degrees plus and the rolling contact angle of 10 degrees are super-hydrophobic surfaces, and have the characteristics of frost prevention and ice prevention, and the frosting can be delayed when the super-hydrophobic surfaces are used.
In some embodiments, the fins are sinusoidal corrugated plates.
Through adopting above-mentioned technical scheme, through the shape on fin surface, make and have more heat transfer surfaces in the heat exchanger of equidimension, consequently, heat transfer area and the heat exchange efficiency of heat exchanger all can promote.
In some embodiments, a longitudinal vortex generator is disposed on each fin.
By adopting the technical scheme, the longitudinal vortex generator is installed, so that when fluid on the gas side passes through the longitudinal vortex generator, the gas is separated from the longitudinal vortex generator due to friction, and under the driving of pressure difference, strong longitudinal rotation is formed and the fluid develops downstream. The existence of the longitudinal vortex breaks the development of a gas side fluid boundary layer, causes the macroscopic mixing of the fluid, increases the turbulence degree, has good heat exchange strengthening effect, can ensure that the longitudinal vortex has small change of the flow direction speed and small increase of the resistance loss, and obviously improves the performance of the heat exchanger.
In some embodiments, adjacent tube bundles are staggered sinusoidally.
By adopting the technical scheme, more working liquid can pass through the tube bundle discharge mode in the heat exchanger with the same size, so that higher heat exchange efficiency and heat transfer coefficient are achieved.
Another party, the application provides a heat exchanger, includes above-mentioned heat transfer structure.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the super-hydrophobic treatment is carried out on the heat exchange surface of the heat exchange structure, so that the heat transfer coefficient k value of the heat exchange structure is increased, and the effect of increasing the ratio of the k value to the pressure drop delta p is achieved;
2. the heat exchange surface of the heat exchange structure is subjected to super-hydrophobic treatment, so that the defrosting energy consumption and the defrosting time are obviously reduced, and the effect of non-stop work of the heat exchange structure is realized;
3. the corrosion on the surface of the heat exchange structure is delayed and reduced by carrying out super-hydrophobic treatment on the heat exchange surface of the heat exchange structure.
Drawings
FIG. 1 is a schematic view of a fin and tube bundle configuration of a heat exchange structure disclosed herein;
FIG. 2 is a side view of a fin and tube bundle of the heat exchange structure disclosed herein.
Reference numerals: 1. a fin; 2. a tube bundle; 11. a longitudinal vortex generator.
Detailed Description
The present application is described in further detail below with reference to figures 1-2.
The present application first discloses a super-hydrophobic coating agent.
Example 1:
the application example 1 discloses a super-hydrophobic coating agent, which is composed of 0.5% of super-hydrophobic nano-particles, 15% of hydrophobic resin and the balance of solvent. Wherein the content of the first and second substances,
the super-hydrophobic nano-particles are silicon dioxide particles with the particle size of 5-100 nm;
the hydrophobic resin is organic silicon resin;
the solvent is ethyl acetoacetate and nitric acid.
The preparation method comprises the following steps: and putting the super-hydrophobic nano particles, the hydrophobic resin and the solvent into a high-speed mixer, stirring, putting the mixture into a double-screw rod for melting and extruding, and tabletting, crushing and screening the melted mixture to obtain the super-hydrophobic coating.
Example 2:
the application example 1 discloses a super-hydrophobic coating agent, which is composed of 2.5% of super-hydrophobic nano-particles, 13% of hydrophobic resin and the balance of solvent. Wherein the content of the first and second substances,
the super-hydrophobic nano-particles are titanium dioxide particles with the particle size of 5-100 nm;
the hydrophobic resin is organic silicon resin;
the solvent is a mixture of potassium tert-butoxide and ethanol in a mass ratio of 1: 1.
The preparation method is as described in example 1, or the superhydrophobic coating is obtained by dissolving the superhydrophobic nanoparticles and the hydrophobic resin in a solvent, performing ultrasonic dispersion for 15-60 minutes, and mixing uniformly.
Example 3:
the application example 1 discloses a super-hydrophobic coating agent, which is composed of 7.5% of super-hydrophobic nano-particles, 8% of hydrophobic resin and the balance of solvent. Wherein the content of the first and second substances,
the super-hydrophobic nano-particles are aluminum oxide particles with the particle size of 5-100 nm;
the hydrophobic resin is organic silicon resin;
the solvent is a mixture of ethyl acetoacetate and nitric acid in a mass ratio of 1: 1.
In order to prevent the hydrolysis of butoxide too fast due to Al (OH)3 precipitation, a chelating agent (ethyl acetoacetate) should be dissolved in water prior to butanol addition, instead of butanol, to slow down the hydrolysis rate. To obtain a good particle size distribution of the suspension, which must be kept below 100nm to cause the formation of nanoparticles and avoid aggregation, a nitric acid solution is gradually added to the mixture. The protons bind to and charge the surface of the forming particles, thereby stabilizing them and avoiding aggregation. After 24 hours at 70 ℃, a clear sol (pH 3.64) was obtained. And stirring and adding hydrophobic resin into the transparent sol to obtain the super-hydrophobic coating.
Example 4:
example 1 of the present application discloses a superhydrophobic coating agent consisting of 5% superhydrophobic nanoparticles, 10% hydrophobic resin, and the remaining amount of solvent, wherein,
the super-hydrophobic nano-particles are a mixture of aluminum oxide particles and silicon dioxide particles in a mass ratio of 1: 1; the grain diameters of the aluminum oxide particles and the silicon dioxide particles are 5-100 nm;
the hydrophobic resin is organic silicon resin,
the solvent is a mixture of n-ethane and butyl acetate in a mass ratio of 1: 1.
The preparation is as described in example 2.
Example 5:
the example 1 of the present application discloses a super-hydrophobic coating agent consisting of 10% of super-hydrophobic nano-particles, 5% of hydrophobic resin, and the remaining amount of solvent. Wherein the content of the first and second substances,
the super-hydrophobic nano-particles are a mixture of aluminum oxide particles and titanium dioxide particles in a mass ratio of 1:1, and the particle size of the aluminum oxide particles and the particle size of the titanium dioxide particles are 5-100 nm;
the hydrophobic resin is organic silicon resin;
the solvent is a mixture of acetone and dimethylethylamine in a mass ratio of 1: 1.
The preparation is as described in example 2.
Example 6:
the example 1 of the present application discloses a super-hydrophobic coating agent consisting of 12% of super-hydrophobic nano-particles, 3% of hydrophobic resin, and the remaining amount of solvent. Wherein the content of the first and second substances,
the super-hydrophobic nano-particles are a mixture of silicon dioxide particles and titanium dioxide particles in a mass ratio of 1:1, and the particle size of the silicon dioxide particles and the particle size of the titanium dioxide particles are 5-100 nm;
the hydrophobic resin is organic silicon resin;
the solvent is a mixture of ethyl acetoacetate, nitric acid, potassium tert-butoxide, ethanol and fluoroalkyl silane in a mass ratio of 1:1:1: 1.
The preparation is as described in example 2.
Example 7:
the example 1 of the present application discloses a super-hydrophobic coating agent consisting of 15% of super-hydrophobic nano-particles, 1% of hydrophobic resin, and the remaining amount of solvent. Wherein the content of the first and second substances,
the super-hydrophobic nano-particles are prepared from the following components in a mass ratio of 1:1, the particle size of the silicon dioxide particles, the titanium dioxide particles and the aluminum oxide particles is 5-100 nm;
the hydrophobic resin is organic silicon resin;
the solvent is a mixture of cyclohexane, n-ethane, butyl acetate, acetone and dimethylethylamine in a mass ratio of 1:1:1: 1.
The preparation is as described in example 2.
The performance test is carried out on the products obtained in the above examples 1-7, and the test method adopts GBT10125-1997 artificial atmosphere corrosion test salt spray test, GB/T26490-2011 static water contact angle/water rolling angle test, GB1720-79 adhesion test, GB1732-79 impact strength test and GB1731-79 flexibility test. The test results are shown in table 1:
table 1 performance test structure:
the application also discloses a heat exchange structure, as shown in fig. 1 and 2, comprising a plurality of parallel fins 1 arranged side by side and a plurality of tube bundles 2 vertically penetrating the fins 1. As shown in fig. 2, in this embodiment of the present application, fin 1 is the sinusoidal corrugated plate, and after fin 1 set up side by side, the crest of every fin 1 aligns with the crest, and the trough aligns with the trough to more heat transfer surfaces have in making the heat exchanger of equidimension, promote heat transfer area and heat exchange efficiency of heat exchanger. The tube bundles 2 are arranged in a sine curve staggered mode, so that more working liquid can pass through the heat exchanger with the same size, and higher heat exchange efficiency and heat transfer coefficient are achieved. The surface of each fin 1 is distributed with longitudinal vortex generators 11, the longitudinal vortex generators 11 are arc triangles, the included angle between the longitudinal vortex generators 11 and the incoming flow is 30 degrees, the influence on the pressure difference on the fluid power is minimum under the angle, and the heat exchange efficiency of the generated longitudinal vortex pair is improved to the maximum. The longitudinal vortex generators 11 are adhered to the fin 1 or punched directly from the fin 1. The longitudinal vortex generators 11 are installed such that when the fluid on the gas side passes through the longitudinal vortex generators 11, the gas is separated from the longitudinal vortex generators 11 due to friction, and driven by the pressure difference, strong longitudinal rotation is formed and developed downstream. The existence of the longitudinal vortex breaks the development of a gas side fluid boundary layer, causes the macroscopic mixing of the fluid, increases the turbulence degree, has good heat exchange strengthening effect, can ensure that the longitudinal vortex has small change of the flow direction speed and small increase of the resistance loss, and obviously improves the performance of the heat exchanger. The super-hydrophobic coating is coated on the whole surface of the fin 1 or the fin 1 and the tube bundle 2 of the heat exchanger disclosed by the application through super-hydrophobic treatment, the surface subjected to super-hydrophobic treatment is required to reach a stable contact angle of more than 150 degrees and a rolling contact angle of less than 10 degrees, the stable contact angle of 150 degrees plus and the rolling contact angle of 10 degrees are super-hydrophobic surfaces, the super-hydrophobic surfaces have the characteristics of frost prevention and ice prevention, and the frost formation can be delayed when the super-hydrophobic surfaces are used.
The application also discloses have above-mentioned heat transfer structure heat exchanger, it still includes the casing (not shown in the figure) that is located the heat transfer structure outside, and the casing material is stainless steel or almag, and simultaneously, the casing surface also coats and has said super hydrophobic coating.
The application also discloses a surface treatment method of the heat exchanger, which comprises the following steps: immersing the fin 1 before assembly or the heat exchanger after assembly into the super-hydrophobic coating agent, wherein when the heat exchanger is immersed into the super-hydrophobic coating agent, the fin 1 is perpendicular to the liquid level, immersed at the speed of 2mm/s, placed in the coating for 5-2 min, and taken out at the speed of 2mm/s, so that a uniform film layer is formed on the surface of the substrate.
And (3) film formation post-treatment:
performing auxiliary drying heat treatment for 60min at 400 deg.C in a baking facility, standing in boiling water for 30min to form petal-shaped super-hydrophobic particles, and baking in an oven at 400 deg.C for 10 min. After the super-hydrophobic surface treatment, the substrate can be immersed in the fluoroalkyl silane solution for 2min, taken out at a speed of 2mm/s and baked at 150 ℃ for 30min to reduce the surface energy.
In other embodiments of the present application, the surface treatment can be performed by spraying, i.e., a coating is sprayed by a 0.5mm to 1.5mm caliber spray gun at a low flow rate under a pressure of 0.2pa, so that a uniform film layer is formed on the surface of the substrate. In this case, the post-film formation treatment method is: drying for 0.5-24 hours at the natural room temperature and/or carrying out auxiliary drying heat treatment for 5-60 min by using a baking facility, wherein the temperature of the auxiliary drying treatment is controlled at 80-150 ℃.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (9)
1. The heat exchange structure comprises a plurality of parallel fins (1) arranged side by side and a plurality of tube bundles (2) vertically penetrating through the fins (1), and is characterized in that superhydrophobic coatings are arranged on the surfaces of the fins (1) or the fins (1) and the tube bundles (2), and the superhydrophobic coatings comprise superhydrophobic nano particles and hydrophobic resin.
2. The heat exchange structure of claim 1, wherein the superhydrophobic nanoparticles are aluminum oxide particles.
3. The heat exchange structure of claim 2, wherein the superhydrophobic nanoparticles have a particle size of 5-100 nm.
4. The heat exchange structure of claim 1, wherein the hydrophobic resin is a silicone resin.
5. A heat exchange structure according to any one of claims 1 to 4, characterised in that the fin (1) surface has a stable contact angle of 150 ° or more and a rolling contact angle of 10 ° or less.
6. A heat exchange structure according to claim 5, characterized in that the fins (1) are sinusoidal corrugated plates.
7. A heat exchange structure according to claim 6, characterized in that each fin (1) is provided with longitudinal vortex generators (11).
8. A heat exchange structure according to claim 7, characterized in that adjacent tube bundles (2) are arranged in a sinusoidal staggered arrangement.
9. A heat exchanger comprising the heat exchange structure of claim 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021851423.1U CN213120173U (en) | 2020-08-29 | 2020-08-29 | Heat exchange structure and heat exchanger |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021851423.1U CN213120173U (en) | 2020-08-29 | 2020-08-29 | Heat exchange structure and heat exchanger |
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| CN213120173U true CN213120173U (en) | 2021-05-04 |
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Effective date of registration: 20210918 Address after: 201800 room jt6826, building 1, No. 2222, Huancheng Road, Juyuan new area, Jiading District, Shanghai Patentee after: Fuli Internet of things (Shanghai) Co.,Ltd. Address before: Room 102, 1 / F, building 5, No. 518, Caosheng Road, Jiading District, Shanghai, 201800 Patentee before: Shanghai Fuli refrigeration equipment Co.,Ltd. |
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