THE INFLUENCE OF THE FLUID’S INLET AND OUTLET WAYS ON VERTICAL PHASE CHANGE THERMAL ENERGY STORAGE DEVICES’ CHARGE AND DISCHARGE PERFORMANCES

摘要

The vertical phase change thermal energy storage device (TESD) is one of the important components in the solar energy-phase change thermal energy storage-fresh air heating system, and its charge and discharge performances have a direct influence on the thermal efficiency of the whole system. Taking TESD for study, based on the results of previous studies, and combining experimental and theoretical analysis, the study has a focus on the influence of density difference which is produced in the process of heat exchange between heat transfer fluid (HTF) and phase change material (PCM) on the charge and discharge performances and thermal efficiency of the system for the difference of the inlet and outlet ways of fluid when HTF flows into or out of TESD, which provides reference for the optimal design of the solar energy-phase change thermal energy storage-fresh air heating system.