In order to further optimize the heat transfer performance of traditional longitudinal finned tube heat exchanger,a flat longitudinal finned tube heat exchanger is proposed.Based on the fundamental heat transfer flow theory,a physical model is established for the flat longitudinal finned tube,the relevant heat transfer equations are given,and the structural parameters of flat tubes and fins are optimized.Heat transfer performances of flat finned tube and round finned tube as well as the composed heat exchangers are compared and analyzed.Results show that the heat transfer area per unit volume of the gas side increases by 1.5 times under the same fin structure parameters and equal cross section,and the volume of the heat exchanger is reduced by more than 50％under the homogeneous heat load.Flat finned tube heat exchangers have compact structure,and better comprehensive advantages,which showing great potentials in popularization.
flat tubelongitudinal finned tubeheat exchangerheat transfer characteristicsstructure optimization
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