Binary-objective optimization of latest low-GWP alternatives to R245fa for organic Rankine cycle application
Published in Energy, 2020
Recommended citation: Yang, Jingye, et al. "Binary-objective optimization of latest low-GWP alternatives to R245fa for organic Rankine cycle application." Energy (2020): 119336. https://www.sciencedirect.com/science/article/abs/pii/S0360544220324439
Abstract
Organic Rankine cycle (ORC) enables to harness waste heat resource to generate electrical power. R245fa is assumed as an appropriate working fluid for low-temperature waste heat recovery. However, strict regulations of CO2 emissions stimulate scientists to search for potential alternatives to R245fa. This paper presents a comparative analysis of various latest low-GWP refrigerants for ORC application. An energetic-economic-environmental evaluation model is established and further integrated into the non-sorted genetic algorithm (NSGA-II) for multi-objective optimization (MOO). A classic decision-making method is employed to screen out the optimal refrigerant for current study. Apart from that, the whole-year ambient conditions in Sydney are taken into consideration to screen refrigerants. Comparing the cycle thermal efficiency, R1224yd(Z) leads to 3.3% higher than R245fa. Comparing the economic cost, it saves 10.4% more than R245fa. Comparing the whole year’s performance, R1224yd(Z) exhibits 11.2% higher cycle thermal efficiency than R245fa while R1234ze(Z) saves 9.85% more economic cost than R245fa. R1224yd(Z) is considered as the optimal working fluid for current ORC system. R1224yd(Z) leads to 16% higher than R245fa. Comparing the maximum , R1224yd(Z), R1234ze(Z) and R1233zd(E) is 16%, 9.2% and 13.5% higher than R245fa, respectively.
Recommended citation: Yang, Jingye, et al. “Binary-objective optimization of latest low-GWP alternatives to R245fa for organic Rankine cycle application.” Energy (2020): 119336.