JPH109784A - Finned heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold a supercooled state of condensate gathering between fins, thereby to make the fins hard to be frosted and to enable maintenance of a heating capacity by a method wherein a water-repellent coating agent containing an antimicrobial agent is applied on the surfaces of the fins which are disposed at uniform intervals in parallel and between which gas flows through. SOLUTION: Fins 5 are disposed at uniform intervals in parallel, gas is made to flow through between them and heat exchange is conducted between a refrigerant flowing through a copper tube 2 and the gas flow. A water-repellent coating agent 7 is applied on the surfaces of the fins 5, while an antimicrobial agent 8 is made to exist in the state of being contained in the water-repellent coating agent 7. When the heat exchange is conducted between the gas flow running through between the fins 5 and the water-repellent coating agent 7, waterdrops are formed by condensation on the water-repellent coating agent 7 and remain in the shape of a bridge between the fins 5 and a supercooled state thereof is held by the antimicrobial agent 8. Thereby the remaining waterdrops are hardly frozen to frost and, accordingly, it is possible to prevent clogging of a heat exchanger and to maintain a heating capacity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger used in an air conditioner or a refrigeration apparatus for transferring heat between a refrigerant and a fluid such as air.

[0002]

2. Description of the Related Art During a heating operation, water condenses on the fin surface of an outdoor unit heat exchanger used as an evaporator, and frost is formed. As a result, the amount of air passing through the heat exchanger decreases, causing problems such as a decrease in heat exchange capacity and a decrease in heating operation time. For this reason, a finned heat exchanger coated with a water-repellent coating agent has been used in order to drop condensed water drops from the fin surface.

A conventional finned heat exchanger coated with a water-repellent coating agent is disclosed in Japanese Patent Application Laid-Open No. Hei 5-222339. Hereinafter, the conventional finned heat exchanger will be described with reference to the drawings.

FIG. 3 is a perspective view showing a conventional finned heat exchanger. In FIG. 3, reference numeral 1 denotes fins made of an aluminum material or the like, which are arranged in parallel at regular intervals, and 2 denotes copper tubes which are mixed at right angles to the fins 1 and arranged in the airflow direction. The copper tubes 2 are connected to each other at both ends of the heat exchanger, and have a configuration in which an airflow flowing between the fins 1 and a refrigerant flowing inside the copper tubes 2 exchange heat.

FIG. 4 is a sectional view of a conventional finned heat exchanger, and FIG. 5 is a sectional view taken along line AA in FIG.

In FIG. 1, reference numeral 3 denotes a fin collar, which connects the fin 1 and the copper tube 2, and 4 denotes a water-repellent coating agent, which is applied to the surface of the fin 1. A refrigerant such as Freon circulates inside the copper tube 2, and the heat of the refrigerant is transferred to the copper tube 2.
To the fin collar 3 and then to the water-repellent coating agent 4 via the fin 1.

[0007]

In this finned heat exchanger, when the fin spacing is about 2 mm, water droplets condensed on the fin surface can fall off the fin surface. The purpose of the exchanger is to increase the capacity, the number of fins is increased in order to increase the total surface area of the fins, and the fin interval tends to be narrow. In this heat exchanger with fins, water droplets condensed on the fin surface during the heating operation accumulate between the fins and become draft resistance, or freeze as it is, forming frost. There was a problem that had to be done.

According to the present invention, the heating capacity is maintained by maintaining the supercooled state of the condensed water accumulated between the fins to prevent frost formation so as not to lower the heating capacity of the finned heat exchanger. Aim.

[0009]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention provides a water-repellent coating agent containing an antibacterial agent for eliminating fungi that releases a supercooled state of water on a fin surface of a heat exchanger. It is configured such that fungi that are a factor of heterogeneous nucleation, which is one method of applying and forming ice from water, do not easily adhere to the fin surface. This allows
By maintaining the supercooled state of the condensed water accumulated between the fins and making it difficult to form frost, it is possible to obtain an effect that the heating capacity can be maintained.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to an air flow system in which fins are arranged in parallel at regular intervals and gas flows between the fins, and a fluid flows through the fins and flows inside. And copper tubes arranged in multiple rows in the direction,
A heat exchanger with fins in which a water-repellent coating agent containing an antibacterial agent is applied to the surface of the fins. This has the effect of maintaining the cooling state and preventing the formation of frost, thereby maintaining the heating capacity.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The same components as those in the related art are denoted by the same reference numerals, and detailed description is omitted.

FIG. 1 is a cross-sectional view of a finned heat exchanger according to one embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line BB of FIG.

In FIGS. 1 and 2, reference numeral 2 is the same as the conventional configuration. Numerals 5 are fins arranged in parallel at regular intervals. Gas flows between the fins, and the refrigerant flowing in the copper tube 2 and the airflow flowing between the fins 5 exchange heat. A fin collar 6 joins the fin 5 to the copper tube 2. Reference numeral 7 denotes a water-repellent coating agent;
It is applied to the surface. Reference numeral 8 denotes an antibacterial agent, which is contained in the water-repellent coating agent 7 and has a function of maintaining a supercooled state of water and preventing the formation of frost, thereby maintaining a heating ability. It is.

The operation of the finned heat exchanger configured as described above will be described below.

In FIG. 1, heat from a refrigerant circulating inside the copper tube 2 is transmitted to the water-repellent coating agent 7 containing the antibacterial agent 8 via the copper tube 2, the fin collar 6, and the fin 5.

At this time, heat exchange is performed between the airflow flowing between the fins 5 and the water-repellent coating agent 7, and water droplets condense on the water-repellent coating agent 7.

If the interval between the fins 5 is narrower than before,
Water droplets condensed on the water-repellent coating agent 7
It remains in the form of a bridge between the fins 5 without flowing down from the surface. The remaining water droplets are maintained in a supercooled state by the antibacterial agent 8 contained in the water-repellent coating agent 7.
For this reason, the remaining water droplets are hard to freeze and become frost,
It is possible to prevent the heat exchanger from being clogged due to the growth of frost, and to maintain the heating capacity.

[0018]

As described above, according to the present invention, the formation of frost on the fins of the outdoor-unit-side heat exchanger during the heating operation can be suppressed, and the heating capacity can be maintained. The effect is obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a finned heat exchanger according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line BB in FIG.

FIG. 3 is a perspective view of a conventional finned heat exchanger.

FIG. 4 is a cross-sectional view of a conventional finned heat exchanger.

FIG. 5 is a sectional view taken along line AA in FIG.

[Explanation of symbols]

 2 Copper tube 5 Fin 7 Water-repellent coating agent 8 Antibacterial agent

Claims (1)

[Claims] 1. A fin comprising a plurality of fins which are arranged in parallel at regular intervals and through which gas flows, and a plurality of rows of copper tubes which penetrate the fins and through which the fluid flows, are arranged in the gas flow direction, A finned heat exchanger in which a water-repellent coating agent containing an antibacterial agent is applied to the surface of the fin.