Precoated fin material for heat exchangers and heat exchanger

A technology for heat exchangers and fins, which is applied in the field of pre-coated fin materials for heat exchangers, and can solve the problems of reduced air volume flowing into the heat exchanger, fin occlusion, and increased ventilation resistance.

Inactive Publication Date: 2014-04-02
NIPPON LIGHT METAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in a heat exchanger using this precoated fin material for heat exchangers, when the temperature of the air is low or the evaporation temperature of the refrigerant is low in the outdoor unit during heating operation, the surface of the fin may adhere to the surface of the fin. In addition, if frost forms, the fins will be blocked, the ventilation resistance will increase, and the air volume flowing into the heat exchanger will decrease, and the evaporation capacity of the heat exchanger of the outdoor unit will decrease.
Therefore, when frost adheres to the surface of the fins of the heat exchanger, in order to remove the frost, it is necessary to stop the heating operation and perform the defrosting operation, which has a problem that the comfort is greatly reduced.
[0003] In addition, as a technique for suppressing such frosting, there is a method of forming a water-repellent film on the surface of the fins. However, this method has the following problem: Although it can prolong the time for blocking due to frosting, it cannot be closed after frosting or the cooling of the refrigerant. Under conditions where the temperature is high and water droplets condense on the surface of the fins, condensed water adheres between the fins, and the attached condensed water forms a bridge between the fins, increasing the ventilation resistance and, as a result, degrading the heat exchange performance

Method used

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  • Precoated fin material for heat exchangers and heat exchanger
  • Precoated fin material for heat exchangers and heat exchanger
  • Precoated fin material for heat exchangers and heat exchanger

Examples

Experimental program
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manufacture example

[0112] In the following production examples, "part" means a mass part, and "%" means a mass %.

[0113] (1) Production of carboxyl-containing acrylic resin (ca) used in the production of ammonium-containing modified epoxy resin (B)

manufacture example 1

[0114] [Manufacturing example 1: Solution of carboxyl group-containing acrylic resin (ca-1)]

[0115] Heat 850 parts of n-butanol to 100°C under a nitrogen stream, and add a monomer mixture and a polymerization initiator "450 parts of methacrylic acid, 450 parts of styrene, 100 parts of ethyl acrylate, peroxide - 40 parts of tert-butyl 2-ethylhexanoate", aging for 1 hour after dropping. Next, a mixed solution of 10 parts of tert-butyl peroxy-2-ethylhexanoate and 100 parts of n-butanol was added dropwise over 30 minutes, followed by aging for 2 hours after the dropwise addition. Next, 933 parts of n-butanol and 400 parts of ethylene glycol monobutyl ether were added to obtain a solution of a carboxyl group-containing acrylic resin (ca-1) having a solid content of about 30%. The obtained resin had a resin acid value of 300 mgKOH / g and a weight average molecular weight of about 17000.

manufacture example 2

[0116] [Manufacturing example 2: Solution of carboxyl group-containing acrylic resin (ca-2)]

[0117] Heat 1,400 parts of n-butanol to 100°C under nitrogen flow, and add the monomer mixture and the polymerization initiator "670 parts of methacrylic acid, 250 parts of styrene, 80 parts of ethyl acrylate, peroxide - 50 parts of tert-butyl 2-ethylhexanoate", aging for 1 hour after dropping. Next, a mixed solution of 10 parts of tert-butyl peroxy-2-ethylhexanoate and 100 parts of n-butanol was added dropwise over 30 minutes, followed by aging for 2 hours after the dropwise addition. Next, 373 parts of n-butanol and 400 parts of ethylene glycol monobutyl ether were added to obtain a solution of a carboxyl group-containing acrylic resin (ca-2) having a solid content of about 30%. The obtained resin had a resin acid value of 450 mgKOH / g and a weight average molecular weight of about 14000.

[0118] (2) Manufacture of modified epoxy resin (ae) containing ammonium base

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Abstract

Provided is a precoated fin material for heat exchangers that is capable of: preventing the formation of frost as soon as possible during operation of a heater; under conditions where condensation is likely to form on a fin surface, quickly removing water droplets by causing the droplets of condensed water to contact a hydrophilic membrane; and configuring a fin structure able to maintain a favorable heat exchange function without increasing ventilation resistance. Further provided is a heat exchanger provided with such a fin structure. The precoated fin material for heat exchangers is provided with: a fin substrate formed from an aluminum plate; a cross-linked water-repellent membrane having a frost-suppressing effect, provided on one surface of the fin substrate, and formed of an aqueous water-repellent coating composition containing prescribed proportions of a resin (A) having a fluorine-atom-containing group, a denatured epoxy resin (B) containing a quaternary ammonium base, and an amino resin (C); and a hydrophilic membrane having a condensation-removing effect and provided on the other surface of the fin substrate. The heat exchanger is provided with a fin structure in which the water-repellent surface having the frost-suppressing effect and the hydrophilic surface having the condensation-removing effect are opposite one another.

Description

technical field [0001] The present invention relates to a precoated fin material for heat exchangers that imparts an excellent frosting suppression effect and condensed water removal effect to the surface of an aluminum plate made of aluminum or an aluminum alloy, and a heat exchanger having a fin structure using the material device. Background technique [0002] The precoated fin material for heat exchangers made of aluminum plate can be used as a fin material for heat exchangers for heat pump air conditioners by forming it into a desired fin shape. However, in a heat exchanger using this precoated fin material for heat exchangers, when the temperature of the air is low or the evaporation temperature of the refrigerant is low in the outdoor unit during heating operation, the surface of the fin may adhere to the surface of the fin. Frost, and if frost forms, the fins will be blocked, the ventilation resistance will increase, and the air volume flowing into the heat exchange...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28F13/18B05D7/14B32B15/20C09D5/00C09D161/20C09D163/00C09D201/04F28F1/32
CPCB05D5/083F28F2245/04C09D5/1662C09D163/00C08G59/4261F28F3/02C08L61/20F28F19/04C08L61/28B32B15/20B32B2255/06B32B2255/26B32B2307/728B32B2307/73C09D5/00F28F2215/00F28F17/005F28F2245/02
Inventor 高泽令子石井透
Owner NIPPON LIGHT METAL CO LTD
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