Thermodynamic and exergoeconomic analyses and performance assessment of a new configuration of a combined cooling and power generation system based on ORC-VCR

摘要

Waste heat recovery systems are proposed to be an environmentally benign and a cost-effective application for efficiency improvement of energy conversion systems. In this research, three different subsystems-gas turbine cycle, steam Rankine cycle, and a coupled organic Rankine cycle-vapor compression refrigeration-are integrated to obtain a high-efficiency layout from technical, economic, and environmental viewpoints. The whole system is simulated and analyzed with regard to energy, exergy, and exergoeconomic models. Furthermore, a sensitivity analysis is made to enable a better understanding of the effect of design parameters on the final performance of the total system. Based upon a parametric study, R602 demonstrates advantageous features such as higher thermal efficiency and improved exergetic efficiency in the ORC-VCR subsystem. Overall, analyses show that the proposed integrated system obtains the total energy and exergy efficiencies of 46.1% and 40.57%, respectively. Moreover, it has been illustrated that the overall structure is able to provide a 3810 kW net output power and a 303.8 kW cooling load. Besides, exergoeconomic evaluation depicts an exergy cost of 49.84 ($ GJ(-1)) and an exergy cost rate of 826.4 ($ h(-1)).