Using a screw-type machine as reversible compressor–expander in a Carnot Battery: An analytical study towards efficiency

Daniel Steger, Michael Feist and Eberhard Schlücker

Applied Energy, 2022, vol. 316, issue C, No S030626192200366X

Abstract: The Carnot Battery is an energy storage concept combining two thermodynamic processes to load and unload a thermal energy reservoir. The idea is under current research by several groups, one possible approach deals with the usage of a Heat Pump Cycle (HP) and an Organic Rankine Cycle (ORC). Saving investment costs, a combination of both processes is possible when using some of the components reversibly. A main challenge is hereby the reversible usage of one machine as compressor and expander with a high efficiency. This paper deals with the aspects to be considered using a screw-type machine as reversible compressor–expander. Geometry studies and thermodynamic calculations are carried out using python libraries. An approach towards a power-to-power efficiency for reversible screw-type machines in context of the HP-ORC usage is made. With this, an optimum point of operation is defined. Based on the results, it is pointed out that compromises have to be made and they are quantified. Finally, a concept for an adaptive geometry is sketched.

Keywords: Carnot Battery; Pumped Thermal Energy Storage; Reversible HP-ORC; Screw-type; Reversible machine; Python calculation (search for similar items in EconPapers)
Date: 2022
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Citations: View citations in EconPapers (2)

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DOI: 10.1016/j.apenergy.2022.118950

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