THERMAL ANALYSIS OF WATER COOLED CHARGE AIR COOLER IN TURBO CHARGED DIESEL ENGINE

J.N. Devi Sankar, P.S.Kishore

Abstract: Air-cooled and water-cooled charge air coolers are used as applications in automobiles. The cooling media include engine’s coolant, ambient air or any other external coolant source. Charge air cooler with offset strip fin geometry is chosen on both hot and cold sides with fin thickness 0.15 mm, length 3.2 mm, height 5.2 mm and frequency of 18 fins per inch. The flow rate on hot side is taken as 0.3 kg/s and cold side as 2 kg/s for air-cooled charge air cooler and for water-cooled charge air cooler on hot side it is 0.3 kg/s and cold side is 0.265 kg/s with inlet temperature on hot side 160 oC and cold side 40 oC. With the above conditions, performance evaluation is done on both charge air coolers. Having found water-cooled charge air cooler is having higher effectiveness than air-cooled type, performance evaluation is carried out on water-cooled charge air cooler with varying mass flow rates on hot side from 0.1 to 0.6 kg/s and keeping cold fluid rate constant at 0.265 kg/s and the outputs obtained are Colburn-j factor, Fanning friction factor, heat transfer coefficient, overall heat transfer coefficient and effectiveness of heat exchanger. From the obtained results, graphs are drawn to assess the performance of the water charge air cooler.

Keywords: Charge Air Cooler, Plate Fin Heat Exchanger, Colburn-J Factor, Heat Transfer Coefficient, Fanning Friction Factor, Effectiveness

DOI: https://doi.org/10.15623/ijret.2016.0502033