Authors: P. Klein, T. H. Roos, T. J. Sheer
Year: 2015
Industry: General Industries
Keywords: Mention FSE, Transient, Validation, TES, Parametric
ABSTRACT
The development of a high temperature Thermal Energy Storage (TES) system will allow for high solar shares in Solar Gas Turbine (SGT) plants. In this research a pressurized storage solution is proposed that utilizes a packed bed of alumina spheres as the storage medium and air from the gas turbine cycle as the heat transfer fluid. A detailed model of the storage system is developed that accounts for transient heat transfer between discrete fluid and solid phases. The model includes all relevant convective, conductive and radiative heat transfer mechanisms and is validated against high temperature experimental data from a laboratory scale test facility. The validated model is further utilized to conduct a parametric design study of a nominal six hour TES (1.55MWhth) for a gas micro-turbine. The concepts of utilization factor and storage efficiency are introduced to determine the optimal storage design. The results of the study indicate that a storage efficiency of 88% and utilization factor of 85% can be achieved when combining thermal storage and hybridization with fossil fuels.