Heat exchanger and air conditioner

Abstract

Provided is a heat exchanger in which: condensed water drainability can be improved; resistance to frosting can be improved; heat exchange performance can be improved; and fin rigidity can be improved. Also provided is an air conditioner using said heat exchanger. A plate-shaped fin (1) comprises: a slit shape (12) that is formed by cutting and raising a portion of the plate-shaped fin (1) and that is opened so as to oppose the flow of a fluid; and a waffle shape (11) formed into a mountain shape, in cross section, that protrudes in the stacking direction by bending a portion of the plate-shaped fin (1), the ridge line of the mountain shape being substantially orthogonal to the air flow direction. The waffle shape (11) is provided more on the upstream side of the fluid than the slit shape (12), and is made such that the slope length (L1) of the mountain shape on the upstream side is shorter than the slope length (L2) on the downstream side.

Description

technical field [0001] The present invention relates to a heat exchanger and an air conditioner using the heat exchanger. Background technique [0002] In conventional heat exchangers, for the purpose of achieving both the improvement of drainage of condensed water and the improvement of heat transfer performance of the fins, it has been proposed that "a tube with a flat cross section extending in the vertical direction ( 2) In the middle of the air flow direction (A), a drainage groove (10) for guiding the condensed water downward is formed, and it is joined to the outer surface of the pipe (2). In the fin (5), a gap (53) is formed at a portion facing the drain groove (10), and the corrugated fin (5) is partitioned into the windward side of the air flow direction (A) by the gap (53). The first fin (51) on the leeward side and the second fin (52) on the leeward side" (for example, refer to Patent Document 1). [0003] prior art literature [0004] patent documents [000...

AI Technical Summary

Problems solved by technology

[0007] In addition, when the fin-and-tube heat exchanger is used in an environment where frost occurs, there is a problem that frost is likely to occur on the fins and heat transfer tubes on the windward side where the absolute humidity in the air is large. Frosting increases ventilation resistance, reduces air volume and reduces heat exchange performance

In particular, in the case of forming a slit-shaped portion formed by cutting a part of the fins, there is a problem that frost is likely to form on the slit portion with high heat transfer performance, and the flow of air passing between the fins is restricted. Obstruction, increased ventilation resistance, reduced frost resistance

[0008] In addition, in a heat exchanger in which the fins are brazed and joined to the heat transfer tubes, the fins are annealed by brazing, thereby greatly reducing the endurance of the fins, reducing the bending strength of the fins, and easily distorting the fins.

When the fins are deflected, the ventilation resistance of the air increases, the air volume decreases, and the heat exchange performance decreases.

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