Thermodynamic and thermoeconomic analyses of a new dual-loop organic Rankine - Generator absorber heat exchanger power and cooling cogeneration system

摘要

This study aims to produce power and cooling by applying exhaust heat. To this end, a hybrid dual-loop organic Rankine - Generator absorber exchange cycle is designed and studied. Furthermore, a thermoeconomic analysis is an essential requirement to study the performance of a thermal cycle. For this reason, the thermoeconomic analysis of this cycle is performed. The dual-loop organic Rankine cycle used in the present study has one low temperature loop and one high-temperature loop in which R143a and Water are used as working fluids, respectively. Also, in the generator absorber exchange refrigeration loop, ammonia-water is applied as a working fluid. In this research, the impact of pressure and temperature of the first evaporator as well as the generator temperature on exergy efficiency, thermal efficiency, total exergy destruction, exergy destruction ratio, net output power, the heat transfer rate of all components, and the coefficient of performance of the Generator absorber exchange section of the hybrid cycle are evaluated. The results indicate that with increasing the temperature of the first evaporator from 620 K to 680 K, the quantities of exergy efficiency, thermal efficiency, total exergy destruction, and net output power increases with the highest increase being 19.96%, 26.54%, 5.67%, and 32%, respectively. The highest exergy destruction ratio happens in the first turbine at the temperature of the first evaporator equal to 620 K, and the pressure of the first evaporator equal to 9 MPa. With increasing the temperature of the generator from 423 K to 448 K, for the generator absorber exchange refrigeration section of the hybrid dual-loop organic Rankine - Generator absorber exchange refrigeration cycle, the coefficient of performance increases by 3.69%. For the system, the exergoeconomic factor indicates that 13.39% cost of the system is relevant to the investment costs and the remaining is related to the cost of exergy destruction.