Round tube, tube and fin heat exchanger with streamlined variable amplitude parabolic corrugated fins

Abstract

The invention discloses a streamline type variable wave amplitude parabolic corrugated fin of a circular tube fin type heat exchanger. Integral streamline type convex ripples 4 with the parabolic cross sections and integral streamline type concave ripples 5 with the parabolic cross sections are extruded on the fin from an airflow inlet to an outlet according to the needs of fin surface expanding and fluid flowing guiding. The same trough and wave crest connecting line is a streamline in which backflow does not occur on a pipe tail of a tube fin type heat exchanger plain film fin side channel corresponding to the fin 1 along the pipe axial center cross section. The convex ripples 4 and the concave ripples 5 change with an appropriate waveform 16 along the longitudinal wave amplitude, and the wave amplitude envelopes corrugated trough and wave crest change in the transverse direction with an appropriate waveform 17. According to the parabolic streamline type corrugated fin, the flowing streamline of the fluid can be effectively improved, flowing resistance is reduced, the surface area of the fin is increased through the convex / concave ripples on the surface of the fin, the heat transfer resistance is reduced, and the overall heat exchanging capacity 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 parabolic corrugated fin of a circular tube-tube-fin heat exchanger. Background technique [0002] Tube-fin heat exchangers are widely used in building air-conditioning, energy, petrochemical, vehicles and other occasions. The thermal resistance of the air side of the round tube, tube and fin heat exchanger is very important to improve the overall heat transfer performance of the heat exchanger. Usually, efforts are made in the fin shape design to reduce the thermal resistance of the air side. In recent years, reinforced fins have been used more and more widely in heat exchangers. Commonly used fin shapes that are conducive to enhanced heat transfer include louvers, transverse corrugations, vortex generators, intermittent annular grooves, and diamond-shaped vertical thorns. [0003] The area with poor heat transfer capacity and l...

AI Technical Summary

Problems solved by technology

The shape of the existing fins that enhance heat transfer enhances heat transfer, but at the same time causes a large local pressure loss in the flow, and the flow linearity of the fluid flowing through the side channels of the fins is relatively poor

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