Abstract
This experimental investigation focuses on the optimization of passive cooling system using extruded finned surfaces with phase change materials (PCMs) as the thermal conductivity enhancers (TCEs). The study develops comparison between fins of circular and square cross-sectional area, made of aluminium. Further classification is done in configuration in terms of staggered and inline arrays. The volume fraction of fins is kept constant at 9% of total volume of heat sink. The purpose is to single out the better arrangement with and without PCM. Six PCMs of varying phase change temperature and heat capacities, namely Paraffin wax, RT-54, RT-44, RT-35HC, SP-31 and n-eicosane are selected for thermal conductivity enhancement. The volume fraction of PCM is also constant at 90% of the heat sink volume, giving a 10% volume for expansion after melting. Moreover, power levels are used in a range of 4-8 W with an increment of 1 W. The analysis was carried out on graphical trends produced and explanations were given accordingly. The most effective PCMs were also discussed considering their enhancement time, enhancement ratios and other material properties. Finally, the results were justified by the scientific knowledge and found in compliance with the work of famous researchers as well. (C) 2017 Elsevier Ltd. All rights reserved.