Thermodynamic and exergy evaluation of a novel integrated structure for generation and store of power and refrigeration using ammonia-water mixture CCHP cycle and energy storage systems

Abstract

An integrated structure for cogeneration power and refrigeration using power generation cycles and energy storage systems is proposed and analyzed. The energy storage system is combined with a cogeneration system for cooling and power production driven by a modified Kalina process and renewable solar energy source. The parabolic trough collectors (PTCs) are used to supply inlet heat in the combined cooling, heat, and power plant (CCHP) process. This integrated system produces 1056.5 kW refrigeration at 0 °C temperature and 269.8 kW power during the day for refrigerator and storage systems. Refrigeration and power storage systems are used overnight for the refrigerator. The ammonia-water mixture CCHP cycle and Kalina power unit thermal efficiencies are 68.05% and 8.772%, respectively. The overall irreversibility rate, thermal and exergy efficiencies of the integrated process are obtained 4745.3 kW, 32.85% and 12.25%, respectively. Exergy analysis shows that the HX5 exchanger, phase change material (PCM), and HX1 exchanger have the most amounts of efficiency 0.9981, 0.9976 and 0.9950, respectively. The largest share of exergy destruction belongs to solar collectors (72.63%), heat exchangers (18.39%), and turbines (4.21%). Sensitivity analysis is used to identify important parameters as well as sensitive components of the developed process. This method illustrates the sensitivity in output and important parameters of the modeled cycle against changes in operating conditions.