Round tube, tube and fin heat exchanger with streamlined variable-amplitude broken-line corrugated fins

Abstract

Disclosed is a streamline amplitude-variable folded-line-shaped corrugated fin of a round tube fin type heat exchanger. According to the needs for expanding the fin surface and guiding fluid to flow, a streamline protrusive corrugation 4 and a recessed corrugation 5 with full sections shaped in folded lines are extruded from an air inlet and an air outlet in a fin. Connection lines among same troughs and crests are folded lines. The streamlines are streamlines without backflow at the tube tails, along an axial central section of a tube, of a lateral passage of a tube fin type heat exchanger plain fin which corresponds to a fin 1. The protrusive corrugation 4 and the recessed corrugation 5 vary along longitudinal amplitude in an appropriate waveform 16, and the amplitude varies transversely in a form of fitting an enveloped corrugation crest of a waveform 17. The streamline folded-line-shaped corrugated fin has the advantages that flowing streamline performance of the fluid can be improved effectively, flowing resistance is reduced, superficial area of the fin is enlarged by the protrusive / recessed corrugations on the fin surface, heat transmission resistance is reduced, and integral heat exchanging performance of the fin is improved.

Description

technical field [0001] The invention relates to fins of a circular tube, tube and fin heat exchanger. In particular, it relates to a streamlined variable-amplitude zigzag corrugated fin of a circular tube-tube-fin heat exchanger. Background technique [0002] Tube-fin heat exchangers generally flow liquid working fluid inside the tube and gas flow outside the tube. In order to reduce the thermal resistance of the air side, installing fins on the outside of the tube can increase the heat transfer area to reduce the thermal resistance. Due to the limitations of heat exchanger volume, economy and fin efficiency, the fin area cannot be increased infinitely. In order to further improve the heat transfer performance of the tube-fin heat exchanger, increasing the turbulence of the fluid is an effective measure to improve the heat transfer effect of the air side. Usually, the surface of the fins is made into a structural shape that is conducive to increasing fluid disturbance, su...

AI Technical Summary

Problems solved by technology

[0003] The circular tube-fin heat exchanger currently uses louver type, slotted type, vortex generator type and other enhanced heat transfer fins, and the flow flow in the channel of the enhanced heat transfer fin is poor. High local resistance to flow

Therefore, the heat transfer performance of the fin surface of the round tube fin heat exchanger needs to be further improved.

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