Thermoelectric Energy Storage TEES using Concentrated Photovoltaic Energy

Abstract

Multi megawatt-thermoelectric energy storage based on thermodynamic cycles is an ambitious solution for the renewable energies conversion. The main advantage of this technology is the capacity of energy storage, However, ensuring the operation of TEES stations during unfavorable weather conditions is suspended. In this article, a specific thermoelectric energy storage system was studied «TEES», the TEES system converts electrical energy from CPV ENERGY into sensible heat by means of an electric heater that uses the joule heating effect, the system TEES converts sensible heat into electrical energy by means of a hybrid power plant that operates on a combined cycle « Brayton and Rankine ».The hybrid power plant uses two thermal energy sources in order to secure thestation in unfavorable weather conditions for the production of solar energy. The main idea is to use the H2 gas or naturel gas and the sensible stored heat as two thermal inputs in the gas turbine with a Brayton cycle, the thermal rejection from the gas turbine is recovered and used as a thermal input in the conventional steam turbine plant that uses a Rankine cycle. A thermodynamic analysis of the TEES system is performed in steady state, using the thermodynamic properties of the Coolprop database. A maximum thermal efficiency or Round trip- electrical efficiency of 50% has been reached; when the heating temperature of the compressed air reaches 1100 ° C and when the isentropic efficiency of steam turbine is 90 percent.