Abstract: The latent heat thermal energy storage system is a
thrust area of research due to exuberant thermal energy storage
potential. The thermal performance of PCM is significantly
augmented by installation of the high thermal conductivity fins. The
objective of the present study is to obtain optimum size and location
of the fins to enhance diffusion heat transfer without altering overall
melting time. Hence, the constructal theory is employed to eliminate,
resize, and re-position the fins. A numerical code based on conjugate
heat transfer coupled enthalpy porosity approached is developed to
solve Navier-Stoke and energy equation. The numerical results show
that the constructal fin design has enhanced the thermal performance
along with the increase in the overall volume of PCM when
compared to conventional. The overall volume of PCM is found to be
increased by half of total of volume of fins. The elimination and repositioning
the fins at high temperature gradient from low
temperature gradient is found to be vital.