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Precoated fin material for heat exchangers and heat exchanger

a technology of heat exchanger and fin, which is applied in the direction of coating, light and heating apparatus, laminated elements, etc., can solve the problems of reducing the quantity of air to flow into the heat exchanger, adhesion to the surface of the fin, and clogging of the fin between the fins, etc., to achieve excellent condensed water removal effect, excellent anti-frizz formation effect, and excellent anti-frizz

Inactive Publication Date: 2014-08-21
NIPPON LIGHT METAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The precoated fin material for heat exchangers of this patent invention has a one-side hydrophobic / one-side hydrophilic film that effectively suppresses frost formation and removes condensed water, allowing for the construction of a fin structure with excellent heat exchanger characteristics. This material also prevents the formation of waterdrops that could otherwise clog the fins and improve heat exchange efficiency over a long period of time without increasing ventilation resistance.

Problems solved by technology

However, in a heat exchanger using the precoated fin material for heat exchangers, when the temperature of the air is low or the evaporating temperature of a refrigerant is low in an outdoor unit at the time of heater operation, frost adheres onto the surface of a fin in some cases.
In addition, once the frost is formed, a gap between fins is clogged to increase a ventilation resistance.
Eventually, the quantity of air to flow into the heat exchanger reduces, and hence the evaporating ability of the heat exchanger of the outdoor unit reduces.
Accordingly, when the frost adheres onto the fin surface of the heat exchanger, the following problem arises.
The heater operation needs to be stopped and a defrosting operation needs to be performed for removing the frost, and hence comfortability remarkably reduces.
However, after defrosting or under such a condition that the temperature of the refrigerant is relatively high so that a water droplet condenses on the surface of the fin, the method involves the following problem.
Condensed water adheres to the gap between the fins, the adhering condensed water forms a bridge between the fins to increase the ventilation resistance, and as a result, heat exchange performance reduces.

Method used

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  • Precoated fin material for heat exchangers and heat exchanger

Examples

Experimental program
Comparison scheme
Effect test

production example 1

Solution of Carboxyl Group-Containing Acrylic Resin (ca-1)

[0101]850 parts of n-butanol were heated to 100° C. in a stream of nitrogen, and then a monomer mixture and a polymerization initiator “450 parts of methacrylic acid, 450 parts of styrene, 100 parts of ethyl acrylate, and 40 parts of t-butyl peroxy-2-ethylhexanoate” were dropped therein over 3 hr. After the dropping, the resultant mixture was aged for 1 hr. Next, a mixed solution of 10 parts of t-butyl peroxy-2-ethylhexanoate and 100 parts of n-butanol was dropped to the aged product over 30 min, and after the dropping, the resultant mixture was aged for 2 hr. Next, 933 parts of n-butanol and 400 parts of ethylene glycol monobutyl ether were added to the aged product to provide a solution of a carboxyl group-containing acrylic resin (ca-1) having a solid content of about 30%. The resultant resin had a resin acid value of 300 mgKOH / g and a weight-average molecular weight of about 17,000.

production example 2

Solution of Carboxyl Group-Containing Acrylic Resin (Ca-2)

[0102]1,400 parts of n-butanol were heated to 100° C. in a stream of nitrogen, and then a monomer mixture and a polymerization initiator “670 parts of methacrylic acid, 250 parts of styrene, 80 parts of ethyl acrylate, and 50 parts of t-butyl peroxy-2-ethylhexanoate” were dropped therein over 3 hr. After the dropping, the resultant mixture was aged for 1 hr. Next, a mixed solution of 10 parts of t-butyl peroxy-2-ethylhexanoate and 100 parts of n-butanol was dropped to the aged product over 30 min, and after the dropping, the resultant mixture was aged for 2 hr. Next, 373 parts of n-butanol and 400 parts of ethylene glycol monobutyl ether were added to the aged product to provide a solution of a carboxyl group-containing acrylic resin (ca-2) having a solid content of about 30%. The resultant resin had a resin acid value of 450 mgKOH / g and a weight-average molecular weight of about 14,000.

(2) Production of Ammonium Salt Group-C...

production example 3

Aqueous Dispersion of Ammonium Salt Group-Containing Modified Epoxy Resin (ae-1)

[0103]513 parts of a jER828EL (manufactured by Japan Epoxy Resins Co., Ltd., epoxy resin, epoxy equivalent: about 190, number-average molecular weight: about 380), 287 parts of bisphenol A, 0.3 part of tetramethylammonium chloride, and 89 parts of methyl isobutyl ketone were loaded, and were then subjected to a reaction for about 4 hr while being heated to 140° C. in a stream of nitrogen. Thus, an epoxy resin solution was obtained. The resultant epoxy resin had an epoxy equivalent of 3,700 and a number-average molecular weight of about 17,000.

[0104]Next, 667 parts of the solution of the carboxyl group-containing acrylic resin (ca-1) having a solid content of about 30% obtained in Production Example 1 were charged into the resultant epoxy resin solution, and were then uniformly dissolved by heating to 90° C. After that, 40 parts of deionized water were dropped to the solution at the temperature over 30 mi...

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Abstract

Provided is a precoated fin material for heat exchangers that allows the construction of a fin structure in which frost formation at the time of heater operation can be prevented to the extent possible, and under such a condition that condensation is liable to occur on a fin surface, a water droplet of condensed water can be quickly removed by bringing the water droplet into contact with a hydrophilic film, and as a result, a favorable heat exchange function can be maintained without any increase in ventilation resistance. Also provided is a heat exchanger including such fin structure. The precoated fin material for heat exchangers includes: a fin substrate formed of an aluminum plate material; a crosslinked hydrophobic film having a frost formation-suppressing effect, the crosslinked hydrophobic film being formed on one surface of the fin substrate and being formed of an aqueous hydrophobic coating composition containing a resin (A) having a fluorine atom-containing group, a quaternary ammonium salt group-containing modified epoxy resin (B), and an amino resin (C) at predetermined ratios; and a hydrophilic film having a condensed water-removing effect, the hydrophilic film being formed on another surface of the fin substrate. The heat exchanger includes a fin structure in which a hydrophobic surface having a frost formation-suppressing effect and a hydrophilic surface having a condensed water-removing effect are opposite to each other.

Description

TECHNICAL FIELD[0001]The present invention relates to a precoated fin material for heat exchangers, having imparted with an excellent frost formation-suppressing effect and an excellent condensed water-removing effect onto a surface of an aluminum plate material formed of aluminum or an aluminum alloy, and to a heat exchanger including a fin structure constructed by using the material.BACKGROUND ART[0002]A precoated fin material for heat exchangers, which is formed of an aluminum plate material, has been used as a fin material for a heat exchanger for a heat pump air conditioner by being molded into a desired fin shape. However, in a heat exchanger using the precoated fin material for heat exchangers, when the temperature of the air is low or the evaporating temperature of a refrigerant is low in an outdoor unit at the time of heater operation, frost adheres onto the surface of a fin in some cases. In addition, once the frost is formed, a gap between fins is clogged to increase a ve...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F28F3/02
CPCF28F3/02C09D163/00C08L61/20C08L61/28C08G59/4261F28F2245/04F28F19/04B32B15/20B32B2255/06B32B2255/26B32B2307/728B32B2307/73C09D5/00F28F2215/00F28F17/005F28F2245/02
Inventor TAKASAWA, REIKOISHII, TORU
Owner NIPPON LIGHT METAL CO LTD
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