Abstract
An adiabatic compressed air energy storage system is coupled with an ejector refrigeration cycle to produce power and cooling capacity. The zeotropic mixtures are used to improve the efficiency of the system and decrease irreversibilities. Comprehensive mass, energy, exergy, and exergoeconomic analyses are applied to evaluate the proposed system performance. Six zeotropic mixtures' performance criteria are compared, which leads to selecting the Pentane/Butane with the mass fraction of 0.5–0.5. The proposed system provides 991.89 kW power, 161.6 kW cooling capacity with 35.55% round trip efficiency, 33.21% exergetic round trip efficiency, and 8.55 years' payback period. Also, the effects of some main parameters variation on the system's performance criteria are investigated as the parametric study. The parametric study reveals that the cavern inlet pressure has the highest impact on the round trip efficiency and cooling capacity, and the charging to discharging pressure ratio includes the highest effect on the power production and exergetic round trip efficiency. Finally, multi-objective optimization is applied to the proposed system, which leads to obtaining the exergetic efficiency and payback period of about 33.45% and 8.45 years, respectively. It's concluded that the utilization of zeotropic mixtures can assist in improving the overall performance of the system.
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