Energy, exergy, and exergoeconomic analyses and optimization of a novel thermal and compressed air energy storage integrated with a dual-pressure organic Rankine cycle and ejector refrigeration cycle

Abstract

The current work analyzes an innovative thermal and compressed air energy storage cycle integrated with a dual-pressure organic Rankine cycle combined with an ejector refrigeration cycle for power and cooling cogeneration. The bottoming cycle employs zeotropic mixtures, including Pentane (0.5)/Butane (0.5) and Pentane (0.5)/Trans-2-butene (0.5), as working fluids for performance improvement. The system assessment includes three crucial viewpoints: energy, exergy, and exergoeconomic. A parametric study is performed to examine the effects of some key parameters on the performance of the devised system. Also, a multi-objective optimization program based on the MOPSO algorithm is conducted to find an optimal trade-off between thermodynamic performance and economic attractiveness of the system considering two decision-making techniques of TOPSIS and LINMAP. The results showed that the sum unit cost of the product has less value for Pentane (0.5)/Trans-2-butene (0.5). Also, it is found that the performance of Pentane (0.5)/Trans-2-butene (0.5) as the zeotropic working fluid is better. Therefore, this fluid is considered as the working fluid for the optimization procedure. Besides, based on the achieved results, the optimum round trip efficiency and sum unit cost of the product are 54.25% and 13.51 $.GJ−1, respectively.