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Numerical analysis of thermal energy storage system using packed-bed

ABSTRACT Solar energy offers an affordable solution to cooking and other household problems of day-to-day life. However, its intermittent nature limits its applications and hence storage is required for the same. In this paper, the numerical simulation of a thermal energy storage system (TES) has been presented. In this analysis, a model is built to estimate the charging and discharging time of packed bed thermal energy storage (PBTES) system. The model consists of a cylindrical container filled with a concrete pebble. The heat transfer fluid used is air passed through the packed-bed. Several parameters are modified to study the impact of pebble diameter and void fraction over the charging and discharging time of PBTES system. The system is built to store energy for18 h with a temperature range between 300 and 120°C, so that it delivers 2.5 kW after charging.