Research progress of direct contact heat storage based on phase change
Phase change heat storage can solve some new energy intermittent and
waste heat recovery problems, but heat storage is needed to act as this
energy hub. Since the direct contact heat accumulator has the advantages
of simple structure, large heat transfer area, and small heat transfer
resistance, it is a good choice for improving energy storage rate.
Although a great deal of research has been done on phase change
materials and heat accumulators over the years, a systematic review of
direct-contact heat accumulators is lacking. This paper reviews the
related research on direct contact heat storage, aiming to summarize the
research work on direct contact phase change heat storage systems.
Various phase change materials (PCMs) for direct contact systems are
analyzed, and the study of PCM melting crystallization behavior, heat
transfer coefficients and system performance in direct contact systems
is summarized, as well as the improvement methods for direct contact
vessels and PCMs. It provides a useful reference for future research on
direct-contact heat storage systems.