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Heat exchanger obtained from aluminum or aluminum alloy

A technology of heat exchangers and aluminum alloys, applied in heat exchange equipment, indirect heat exchangers, heat exchanger types, etc. frost effect

Active Publication Date: 2014-01-15
NIPPON LIGHT METAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above air-conditioning heat exchanger, when the temperature of the air is low or the evaporation temperature of the refrigerant is low in the outdoor unit during heating operation, frost may adhere to the surface of the fins, and if frost forms, the fins may If the inter-sheets are blocked, the ventilation resistance increases, and the air volume flowing into the heat exchanger decreases, and the evaporation capacity of the heat exchanger of the outdoor unit decreases.
Therefore, when frost adheres to 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 of blocking due to frosting, it cannot be closed after defrosting or the cooling medium. 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, the heat exchange performance decreases

Method used

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  • Heat exchanger obtained from aluminum or aluminum alloy
  • Heat exchanger obtained from aluminum or aluminum alloy
  • Heat exchanger obtained from aluminum or aluminum alloy

Examples

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manufacture example

[0110] In the following production examples, "part" means a mass part, and "%" means a mass %.

[0111] (1) Production of carboxyl-containing acrylic resin (ca) used in the production of ammonium-containing modified epoxy resin (B)

manufacture example 1

[0112] [Manufacturing example 1: Solution of carboxyl group-containing acrylic resin (ca-1)]

[0113] 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

[0114] [Manufacturing example 2: Solution of carboxyl group-containing acrylic resin (ca-2)]

[0115] 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.

[0116] (2) Manufacture of modified epoxy resin (ae) containing ammonium base

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Abstract

Provided is a heat exchanger equipped with a heat-exchanger fin 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 as a result, maintaining a favorable heat exchange function without increasing ventilation resistance. A heat exchanger provided with a heat-exchanger fin being made from an aluminum plate and having a hydrophilic membrane and a cross-linked water-repellent membrane that exhibits a frost-suppressing effect, wherein: the surface area constituted by the cross-linked water-repellent membrane in a 10mm x 10mm square area in an unspecified location on the surface of the heat-exchanger fin is 20-80%; the cross-linked water-repellent membrane contains 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 an aqueous water-repellent coating composition from which the heat exchanger is formed has 1-30 parts by mass of solid content of the resin (A), and 100 parts by mass in total of the solid content of the resin (B) and the resin (C).

Description

technical field [0001] The present invention relates to a heat exchanger formed of heat exchanging fins formed of an aluminum plate made of aluminum or an aluminum alloy, the surface of which is provided with an excellent frosting suppression effect and condensed water removal effect. Background technique [0002] Heat exchangers using heat exchanging fins formed of aluminum plates are used in air conditioners, refrigerators, automotive instruments, and the like. In the above air-conditioning heat exchanger, when the temperature of the air is low or the evaporation temperature of the refrigerant is low in the outdoor unit during heating operation, frost may adhere to the surface of the fins, and if frost forms, the fins may The inter-sheets are blocked, the ventilation resistance increases, and the air volume flowing into the heat exchanger decreases, and the evaporation capacity of the heat exchanger of the outdoor unit decreases. Therefore, when frost adheres to the heat ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28F13/18F28F1/32
CPCC08F220/06C09D133/16F28D1/05333F28F1/126F28F19/04F28F2245/02F28F2245/04C08L39/02C08L63/00C08L2205/03C08F212/08C08F220/1802F28F13/18
Inventor 高泽令子山崎和彦
Owner NIPPON LIGHT METAL CO LTD
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