Fin tube heat exchanger

Abstract

A fin tube heat exchanger has heat transfer fins disposed in an air flow and plural heat transfer tubes that are inserted in the heat transfer fins and disposed in a direction substantially orthogonal to a flow direction of the air flow. On the heat transfer fins, a set of guide fins and a set of guide fins arranged straightly from upstream to downstream in the flow direction of the air flow are formed, by cutting and raising, on the heat transfer fin surfaces on both sides of the heat transfer tubes. Straight lines that hypothetically interconnect the guide fins and the guide fins slant with respect to the flow direction of the air flow so as to guide the air flow in the vicinities of the heat transfer tubes to rear sides of the heat transfer tubes in the flow direction.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a fin tube heat exchanger, and in particular to a fin tube heat exchanger having heat transfer fins disposed in an air flow and plural heat transfer tubes that are inserted in the heat transfer fins and disposed in a direction substantially orthogonal to a flow direction of the air flow.[0003]2. Background Information[0004]Conventionally, fin tube heat exchangers (i.e., cross fin and tube heat exchangers) having heat transfer fins disposed in an air flow and plural heat transfer tubes that are inserted in the heat transfer fins and disposed in a direction substantially orthogonal to a flow direction of the air flow have been widely used in air conditioners and the like.[0005]In such fin tube heat exchangers, as a heat transfer promoting technique for the purpose of reducing dead water regions formed in the portions of the heat transfer tubes in the heat transfer fins downstream in the fl...

AI Technical Summary

Benefits of technology

[0009]In this fin tube heat exchanger, the guide fins are plurally divided from upstream to downstream in the flow direction of the air flow, and the plural guide fins slant with respect to the flow direction of the air flow so as to guide the air flow in the vicinities of the heat transfer tubes to rear sides of the heat transfer tubes in the flow direction of the air flow, so mainly the effect of renewing the boundary layers can be reliably obtained by the guide fins of the plural guide fins that are disposed on the front sides of the heat transfer fins in the flow direction of the air flow and the effect of reducing dead water regions formed of the rear sides of the heat transfer fins in the flow direction of the air flow can be obtained by the guide fins that are disposed on the rear sides of the heat transfer fins in the flow direction of the air flow, and it can be made easier for drain water occurring on the heat transfer fin surfaces to be drained from gaps between the guide fins. Thus, a heat transfer promoting effect by the guide fins can be obtained without being affected by drain water occurring on the heat transfer fin surfaces.

[0010]Moreover, because the plural guide fins are straightly arranged from upstream to downstream in the flow direction of the air flow, the guide fins of the plural guide fins that are disposed on the rear sides of the heat transfer fins in the flow direction of the air flow have the same inclination as the guide fins that are disposed on the front sides in the flow direction of the air flow, so not only do they reduce dead water regions formed in portions on the rear sides of the heat transfer tubes in the flow direction of the air flow, but they can prevent new dead water regions from being formed on the backs of the guide fins.

[0011]As described above, in the fin tube heat exchanger pertaining to the present invention, the effect of promoting heat transfer by the guide fins can be obtained without being affected by drain water occurring on the heat transfer fin surfaces, and new dead water regions can be prevented from being formed on the backs of the guide fins, so a heat transfer promoting effect and water drainability by the guide fins can be simultaneously achieved.

[0013]In this fin tube heat exchanger, by giving each of the guide fins a shape whose height gradually increases downstream in the flow direction of the air flow, vertical vortexes can be created on the back of each of the guide fins, so that the heat transfer promoting effect by the guide fins can be further raised.

[0015]In this fin tube heat exchanger, the water drainage promoting portion is formed between the guide fins, so the ability of the guide fins to drain water can be further raised.

Problems solved by technology

However, when a fin tube heat exchanger in which the aforementioned guide fins are employed is used as an evaporator of a heat medium such as refrigerant which uses air as a heat source such as represented by air conditioners and the like, a problem arises in that drain water occurring due to heat exchange between the air and the heat medium accumulates on the guide fins and increases ventilation resistance.

Further, when a fin tube heat exchanger in which the aforementioned guide fins are employed is used as an outdoor heat exchanger configuring an outdoor unit of an air conditioner, a problem arises in that, although sometimes frost occurring on the heat transfer fin surfaces is removed by defrosting operation, water drainability is lowered in this case.

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