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Free cooling is the process of storing the cool energy available in the night   ambient air and using it during the day. The heat exchanger used in this work   is a modular type which is similar to the shell and tube heat exchanger. The   shell side is filled with Phase Change Materials (PCM) and air flow is   through the tubes in the module. The modules of the heat exchanger are   arranged one over other with air spacers in between each module. The air   space provided in between the module in-creases the retention time of the air   for better heat transfer. Transient Computational Fluid Dynamics modeling is   carried out for single air passage in a modular heat exchanger. It shows that   the PCM phase transition time in the module in which different shape of fins   is adopted. The module with rectangular fins has 17.2 % reduction in   solidification compared with the plain module. Then steady state numerical   analysis is accomplished to the whole module having the fin of high heat   transfer, so that pressure drop, flow and thermal characteristics across the   module and the air spacers are deter-mined for various air inlet velocities   of 0.4 to 1.6 m/s. To validate the computational results, experiments are   carried out and the agreement was found to be good

Study of heat transfer and pressure drop characteristics of air heat exchanger using PCM for free cooling applications