Analytical Modeling of Energy and Efficiency of Cryogenic Energy Storage Plant Using Various Working Fluids to Identify Best One for Load Shifting of Nuclear Power Plant and Renewable Energy Sources

Abstract

Cryogenic energy storage (CES) systems are good electricity storage method. In CES systems, excess current is used to liquefy gas. Liquid (cryogen) can be stored in large cryogenic tanks for a long time. Whenever there is demand for electric current, cryogen is warmed by waste heat to obtain gas. Gas so generated is then used to run gas turbine and generate electric current. Most researches are on air-based CES, as air is easily available. CES with other working fluids exhibit higher efficiency. In current modeling work, performance analysis of CES systems was done for different types of cryogens. Finally, it is concluded that CES with methane (natural gas) as the working fluid could exhibit highest efficiency.