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Method for improving heat and moisture transfer efficiency of tubular indirect evaporative cooler

An evaporative cooler, heat and moisture exchange technology, applied in heat exchange equipment, chemical instruments and methods, heat transfer modification, etc., can solve the problem of affecting the heat and moisture exchange efficiency of the secondary air side, prone to dry points, and uneven water distribution Uniformity and other issues to achieve the effect of improving efficiency, improving water quality and flexible process

Inactive Publication Date: 2013-04-03
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the heat exchange wall material of the indirect evaporative cooler is more common metal aluminum foil, the metal aluminum foil wall is a non-hydrophilic surface, the distribution of water on the wall is uneven, and dry spots are prone to appear, which affects the secondary air side of the indirect evaporative cooler. Heat and moisture exchange efficiency

Method used

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  • Method for improving heat and moisture transfer efficiency of tubular indirect evaporative cooler
  • Method for improving heat and moisture transfer efficiency of tubular indirect evaporative cooler
  • Method for improving heat and moisture transfer efficiency of tubular indirect evaporative cooler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Metal aluminum foil material is used to coat TiO on the outer surface of the heat exchange tube 2 Coating, the specific steps are as follows:

[0046] a. Preparation of TiO by sol-gel method 2 sol

[0047] By volume Ti (OC 4 h 9 ) 4 :EtOH:H 2 O: C 6 h 15 NO 3 10:35.8:0.52:4.40, dissolve tetrabutyl titanate in absolute ethanol to obtain the first solution, mix ethanol and water to obtain the second solution, mix the two solutions, then add triethanolamine and SiO 2 , SiO 2 The amount of added is 10% of the total mass of the above five substances. After magnetic stirring for 1 hour, reflux aging at 80°C for 10 hours, a transparent and stable TiO 2 Sol;

[0048] b. Ultrasonic cleaning treatment on the surface of metal aluminum foil

[0049] The heat exchange tubes are divided into volume ratio H 2 O: NH 4 OH:H 2 o 2 =5:1:1 and H 2 O: HCL: H 2 o 2 =5:1:1 ultrasonic cleaning for 30 minutes, followed by ultrasonic rinsing with secondary deionized water for ...

Embodiment 2

[0053] Metal aluminum foil material is used to coat TiO on the outer surface of the heat exchange tube 2 Coating, the specific steps are as follows:

[0054] a. Preparation of TiO by sol-gel method 2 sol

[0055] By volume Ti (OC 4 h 9 ) 4 :EtOH:H 2 O: C 6 h 15 NO 3 10:35.8:0.52:4.40, dissolve tetrabutyl titanate in absolute ethanol to obtain the first solution, mix ethanol and water to obtain the second solution, mix the two solutions, then add triethanolamine and SiO 2 , SiO 2 The amount of added is 40% of the total mass of the above five substances. After magnetic stirring for 1 hour, reflux aging at 80°C for 10 hours, transparent and stable TiO 2 Sol;

[0056] b. Ultrasonic cleaning treatment on the surface of metal aluminum foil

[0057] The heat exchange tubes are divided into volume ratio H 2 O: NH 4 OH:H 2 o 2 =5:1:1 and H 2 O: HCL: H 2 o 2 =5:1:1 ultrasonic cleaning for 30 minutes, followed by ultrasonic rinsing with secondary deionized water for 30...

Embodiment 3

[0061] Metal aluminum foil material is used to coat TiO on the outer surface of the heat exchange tube 2 Coating, the specific steps are as follows:

[0062] a. Preparation of TiO by sol-gel method 2 sol

[0063] By volume Ti (OC 4 h 9 ) 4 :EtOH:H 2 O: C 6 h 15 NO 3 10:35.8:0.52:4.40, dissolve tetrabutyl titanate in absolute ethanol to obtain the first solution, mix ethanol and water to obtain the second solution, mix the two solutions, then add triethanolamine and SiO 2 , SiO 2 The amount of added is 20% of the total mass of the above five substances. After magnetic stirring for 1 hour, reflux aging at 80°C for 10 hours, a transparent and stable TiO 2 Sol;

[0064] b. Ultrasonic cleaning treatment on the surface of metal aluminum foil

[0065] The heat exchange tubes are divided into volume ratio H 2 O: NH 4 OH:H 2 o 2 =5:1:1 and H 2 O: HCL: H 2 o 2 =5:1:1 ultrasonic cleaning for 30 minutes, followed by ultrasonic rinsing with secondary deionized water for ...

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Abstract

The invention discloses a method for improving the heat and moisture transfer efficiency of a tubular indirect evaporative cooler, which comprises the following steps: the heat exchange tubes of the tubular indirect evaporative cooler adopt a metal aluminum foil material; a TiO2 membrane or a TiO2 coating is coated on the external surfaces of the heat exchange tubes; the heat exchange tubes are quincuncially arranged to be manufactured into the tubular indirect evaporative cooler; ultraviolet lamps are arranged at the two sides in the box of the tubular indirect evaporative cooler; and the light of the ultraviolet lamps is in timing and interval radiation on the heat exchange tubes before or when the tubular indirect evaporative cooler operates. The method disclosed by the invention improves the hydrophilia performance on the surfaces of the heat exchange tubes; the contact angle of the surface of the TiO2 membrane or the TiO2 coating with water is reduced to be lower than 5 degrees and even reaches 0 degree, thus the water drops are completely flooded on the surface of the TiO2 membrane or the TiO2 coating; the super hydrophilia on the surfaces of the heat exchange tubes of the tubular indirect evaporative cooler is realized, thereby forming a uniform thin water membrane on the external surfaces of the heat exchange tubes; and the evaporation efficiency of the water on the heat exchange tubes is improved, thereby realizing the effects of high efficiency, energy conservation and water conservation of the indirect evaporative cooler.

Description

technical field [0001] The invention belongs to the technical field of air-conditioning refrigeration heat and mass transfer, and in particular relates to a method for improving the heat-moisture exchange efficiency of a tube-type indirect evaporative cooler. Background technique [0002] In the indirect evaporative cooler, the primary air and the secondary air are separated by the heat exchange element. On the secondary air side, a water film is formed on the heat exchange wall by spraying circulating water. The secondary air and water are in direct contact for heat and moisture exchange. The temperature of the water film is maintained at the wet bulb temperature of the secondary air, and the primary air transfers heat to the secondary air through the heat exchange element and the water film to achieve the purpose of cooling. In this process, the hydrophilicity of the heat exchange wall on the secondary air side is one of the important factors affecting the heat exchange e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28F13/18F28F21/08B32B1/08B32B15/04B32B15/20B32B9/04
Inventor 黄翔汪超夏青
Owner XI'AN POLYTECHNIC UNIVERSITY
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