Book's Highlights: This book discusses the theory of solar thermal storage with emphasis on latent heat storage and application of CFD for heat transfer improvement. It covers the important topics of the rapidly growing field of latent heat thermal energy storage (LHTES) in a lucid manner. It discusses the state-of-the-art methods to enhance heat transfer efficiency of PCM-based thermal storage systems. It demonstrates the use CFD tool for two methods of heat transfer control/enhancement viz. use of MHD electrically conducting PCM and fins of the low thermal conductivity PCMs.