Ruths energy storage system design methodology

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The proposal aims to develop an inverse design methodology for an energy storage system of the Carnot battery type. The system will be able to store electric energy as internal thermal energy of a working fluid and is part of an overall energy system with fluctuating sources of renewable electric energy. The proposed Ruths storage system consists of two wet-steam storage tanks at different pressure, coupled by a compressor and an expansion device, so electric energy can be converted into internal thermal energy and vice versa. The size of the tanks and the fluid energy machinery must be well matched to the specific application, which could be an urban city housing district or an industrial production plant. The inverse design is started with an energy system analysis tool to find suitable boundary conditions, a first version of an appropriate technical design is returned back, so a first cost and feasibility assessment can be given. The procedure is repeated for optimization. The energy system analysis including cost functions will be handled by R. Niepelt, the technical design by S. Kabelac, both from the Leibniz University Hannover. Some special design features of the Ruths storage tank will be validated experimentally.