Improving the efficiency of a regasification circuit operating on a two-stage Brayton cycle for cryogenic energy storage systems

Currently, the issue of compensating for uneven loads on power grids is one of the key directions in the development of the energy sector. One solution to this problem is the use of cryogenic energy storage systems, which allow energy to be stored in the form of liquefied gas. The main drawback of such systems is their relatively low storage coefficient, and this paper proposes to improve it by using a two-stage Brayton cycle in the regasification circuit. As a result of technical and economic analysis, a Pareto-efficient frontier of circuit configurations was obtained, working fluids for the upper and lower stages were determined, and the profitability of the installations was established.