这项研究提出了三个低全球变暖潜能值(GWP)替代品的热经济评估,R1233zd(E),R1234ze(Z)和R1234ze(E),对于用于有机朗肯循环(ORC)系统的R245fa,考虑两种不同热源的模型。柴油发电机的排热用作型号I的热源,而排气和夹套冷却水的余热被用作模型II的热源。请注意,R1234ze(E)的工作压力远高于R1233zd(E)的工作压力,R1234ze(Z)和R245fa在固定的蒸发温度范围内。此外,使用R1234ze(E)的系统具有型号I的最小净功率输出,而它变成了模型II的最大净功率输出。此外,R1234ze(Z)和R1233zd(E)都可以用作R245fa的良好替代工作流体,因为R1234ze(Z),R1233zd(E)和R245fa具有接近的工作压力,最大净功率输出,和最低的均衡能源成本。与模型I相比,R1233ed(E)和R1234ze(Z)的LECmin分别减少10.8%和9.9%,R1233ed(E)和R1234ze(Z)的PBmin分别减少11.5%和10.1%,分别,在模型II中。然而,在所研究的四种工作流体中,R1233zd(E)的模型I和模型II的最小投资回收期最高。
This study presents a thermo-economic assessment of three low-global-warming-potential (GWP) substitutes, R1233zd(E), R1234ze(Z) and R1234ze(E), for R245fa used in organic Rankine cycle (ORC) systems, considering two models with different heat sources. The exhaust heat from a diesel generator is served as heat source of Model I, while the waste heat of exhaust and jacket cooling water are used as heat source of Model II. It is noted that the working pressure of R1234ze(E) is much higher than that of R1233zd(E), R1234ze(Z) and R245fa in a fixed evaporation-temperature range. Furthermore, the system using R1234ze(E) has the minimum net power output for Model I, while it turns into the maximum net power output for Model II. In addition, both R1234ze(Z) and R1233zd(E) can be used as good alternative working fluids for R245fa because R1234ze(Z), R1233zd(E) and R245fa have close working pressures, maximum net power outputs, and minimum levelized energy costs. Compared to Model I, LEC min of R1233ed(E) and R1234ze(Z) are reduced by 10.8 % and 9.9 % and PB min of R1233ed(E) and R1234ze(Z) are reduced by 11.5 % and 10.1 %, respectively, in Model II. However, R1233zd(E) has the highest minimum payback period for both Model I and Model II among the four working fluids investigated.