Analytical and numerical investigation of heat exchange in fin-tube refrigerating heat exchanger

摘要

Intensification by tube fin is intended to increase the heat exchange surface between the heat exchange surface and surrounding fluid.This method of intensification is applied to the heat exchangers type air coolers(refrigeration heat exchanger with indirect cooling).The interaction of cooled air in refrigeration equipment is most often a natural convection(quiet cooling).For the purposes of this work,a finned tube heat exchanger with a coolant a brine solution of CaCb was viewed.The numerical studies for ribbed cross sections at three different heights were done.On the basis of the results obtained for heat flow in a rib and throughout the exchanger,the effectiveness of the apparatus was determined.The model studies in Flow Simulation were carried out.For the purpose of the simulations a geometric models of two elements from cooling fin-tubes at three different heights(h)of the ribs(10 mm,20 mm and 30 mm)were made.Numerical studies to investigate the velocity and temperature distribution at different rib height were carried out.