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Nanometer coating on coiler surface of heat exchanger

A nano-coating and heat exchanger technology, applied in the field of heat exchange, can solve the problems of increased energy consumption of fans and water pumps, increased air resistance, and easy fouling, so as to improve heat exchange efficiency, increase service life, eliminate and corrode Effect

Inactive Publication Date: 2005-02-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned tube types are mostly single-sided wetting tubes, and the spray water cannot spray the entire surface of the coil and replenish the evaporated water in time. This not only does not apply fully to the effective area of ​​the coil, but also forms " "Dry spots", easy to scale and affect heat transfer performance and equipment life
On the other hand, in order to fully wet the surface of the coil, the amount of spray water increases, the air resistance increases, the energy consumption of the fan and water pump increases, and the operating cost of the evaporative heat exchanger increases.

Method used

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  • Nanometer coating on coiler surface of heat exchanger
  • Nanometer coating on coiler surface of heat exchanger
  • Nanometer coating on coiler surface of heat exchanger

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Using carbon steel circular coil, coated to get image 3 In the coating structure shown, the thicknesses of the hydrophilic film 1-2 are respectively 8, 15, and 35nm, the thicknesses of the anti-corrosion layer 1-1 are respectively 2, 10, and 15nm, and the thicknesses of the heat transfer layer 1-3 are respectively 2, 5, 10nm. The total thickness of the obtained three-layer structure coating is 12, 30, 60 nm.

[0029] Experiments have shown that the contact angles of the coil surface of the heat exchanger in this example are reduced to 8°, 2°, and 6° from 40°, 35°, and 38° of the existing coil light tube. The evaporative heat exchanger adopts the heat exchange coil with the coating of this example, the water saving is 13%, 23%, 18%, and the heat transfer performance is relatively improved by 18%, 30%, and 22%.

Embodiment 2

[0031] A copper circular coil is used to coat a two-layer coating structure, wherein the thickness of the hydrophilic film 1-2 is 8, 15, and 35nm respectively, and the thickness of the anti-corrosion layer 1-1 is 2, 10, and 15nm respectively. The total thickness of the obtained two-layer structure coating is 10, 25, 50 nm.

[0032] Experiments have shown that the contact angles of the nano-coated surface of the coil surface of the heat exchanger in this example are reduced from 38°, 36°, and 40° of the existing coil tubes to 9°, 3°, and 5°. The evaporative heat exchanger adopts the heat exchange coil with the coating of this example, the water saving is 12%, 25%, and 20%, and the heat transfer performance is relatively improved by 15%, 28%, and 21%.

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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 [0001] The invention relates to heat exchange technology, in particular to a special nano-hydrophilic coating on the surface of an evaporative heat exchanger coil. Background technique [0002] The existing evaporative heat exchangers include evaporative coolers, evaporative condensers, and surface evaporative air coolers. Their basic structures are as follows: figure 1 shown. It is mainly composed of heat exchange coil 1, water distribution device 6, fan 4, water retaining plate 5, circulating water pump 7, air inlet grille 2, and water collection tank 3. When the evaporation works, the cooling water in the water collection tank 3 is sent to the water distribution device 6 by the circulating water pump 7, and sprayed on the surface of the heat exchange coil 1 to form a water film. The working medium is condensed or cooled, part of the water evaporates into steam, and the remaining water falls into the water collection tank 3...

Claims

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Application Information

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IPC IPC(8): F28D5/02F28F13/18
Inventor 朱冬生沈家龙蒋翔徐丽
Owner SOUTH CHINA UNIV OF TECH
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