Enhancement the Heat Transfer Rate of a counter flow heat exchanger by Using Longitudinal Fins With Different Cross-sections and Heights

Abstract

In the present work, a numerical simulation of a double pipe counter-flow heat exchanger is presented in order to study the effects of adding longitudinal (triangular and rectangular) fins supported on the outer surface of the inner tube with dimensions (2×6×1000) mm and the number of fins (8) fixed for all types of fins. With different amounts of mass flow rates for the hot and cold sides, the benefits of the fin type were studied further studying the effect of three heights (4, 6 and 8) mm for the type of fins that give better thermal performance. The results showed that the rectangular fins gave a heat transfer coefficient compared to the triangular fins with an improvement rate of 15% over the smooth tubes, while the triangular fins gave a rate of 11% over the smooth tubes. The triangular fins show a lower pressure drop of 49.6% compared to the regular tube, while the rectangular fins give a pressure drop of 59.8% compared to the regular tube.