Improvement of Heat Transfer Coefficient for A Cross Flow Heat Exchanger by Using the High Integral Finned Tube

Abstract

This study investigated experimentally of the heat transfer and the effect of fins in improving heat transfer for the cross flow heat exchangers with eight passes (smooth and high integral finned tubes) and that are cooled by air. Two models of heat exchangers are designed and manufactured for testing from pure copper metal. They were designed for comparison under different test conditions. The water flow rate in the inner tubes with (2, 3, 4, 5, 6) L/min with inlet temperatures of (50, 60, 70)^oC. The air was passed outer the tubes with speeds (1, 1.7 and 2.3) m/s. This study resulted that the high integral finned tube was more improvement the heat transfer than the smooth tube. The enhancement of (Q) was (329.9%) for high integral finned tube and The enhancment factor (291%).