Abstract
A 17 kWhth packed bed thermal energy storage (PBTES) system for concentrated solar power application (CSP) has been investigated by using a two-phase energy model. The PBTES system used in this study consists of quartzite as storage material and caloria HT-43 as a heat transfer fluid (HTF). Simulation of 17 kWhth packed bed system has been utilised to study the effect of void fraction, storage material on charging efficiency and pressure drop at varying mass flow rate (0.01∼0.04 kg/s) of HTF. In this study, parametric optimisation using the Taguchi method has also been done to get the optimum parameter for maximum efficiency and minimum pressure drop. Results show that void fraction has more effect on charging efficiency as compared to pebbles diameter. The percentage decrease in charging efficiency is 8.1% for pebbles diameter varying from 0.03 to 0.05 and 13.5% for void fraction varying from 0.3 to 0.5.
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