Round tube, tube and fin heat exchanger streamlined variable amplitude circular arc corrugated fins

Abstract

Disclosed is a streamline variable-amplitude arc-shaped wavy fin for round tube fin heat exchanger. According to needs of surfaces of extending fins and fluid flow guiding, streamline convex waves 4 and streamline concave waves 5 with integral cross sections in sine / cosine shapes are formed through extrusion on the fins from an air flow inlet to an outlet. Connection lines of the same wave troughs and wave crests are all streamlines. The streamlines are streamlines which enable backflow at tube ends to be avoided in a direction from the tube axis to central cross section in a side channel of a tube fin heat exchanger plate fin corresponding to the fins 1. The streamline convex waves 4 and the streamline concave waves 5 vary according to a needed waveform 16 along longitudinal wave amplitudes, and the wave amplitudes vary in a mode of a needed waveform 17 enveloping wave troughs and crests. The streamline arc-shaped wavy fin can effectively improve streamline of liquid flow, and reduces flow resistance; the convex / concave waves on the surface of the fin increase surface areas of the fin, therefore, the flow resistance is reduced and heat exchange capability of the fin is improved.

Description

technical field [0001] The invention relates to fins of a circular tube-tube-fin heat exchanger, in particular to a streamlined variable-amplitude arc-shaped corrugated fin of a circular tube-tube-fin heat exchanger. Background technique [0002] Round tube, tube and fin heat exchangers are widely used in chemical industry, air conditioning, refrigeration and other industries. During use, generally liquid working medium flows inside the tube, and gas flows outside the tube. The thermal resistance of the gas side accounts for 70%-90% of the total thermal resistance of this type of heat exchanger, which is the main thermal resistance of the heat transfer link. Reducing the thermal resistance of the air side is very important to improve the overall heat transfer performance of the heat exchanger of. 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 transf...

AI Technical Summary

Problems solved by technology

These fins can achieve the purpose of enhancing heat transfer on the fin surface, but at the same time it also causes an increase in flow resistance

[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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