Yang Min-Hsiung, Liu Ming-Chuan, Yeh Rong-Hua
Dept. of Naval Architecture and Ocean Engineering, National Kaohsiung University of Science and Technology, Taiwan, China.
Dept. of Marine Engineering, National Kaohsiung University of Science and Technology, Cijin District, Kaohsiung City, Taiwan, China.
Heliyon. 2024 Jul 6;10(14):e34219. doi: 10.1016/j.heliyon.2024.e34219. eCollection 2024 Jul 30.
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, of R1233ed(E) and R1234ze(Z) are reduced by 10.8 % and 9.9 % and 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.
本研究针对有机朗肯循环（ORC）系统中使用的R245fa，对三种低全球变暖潜能值（GWP）替代物R1233zd(E)、R1234ze(Z)和R1234ze(E)进行了热经济评估，考虑了两种具有不同热源的模型。柴油发电机的废热用作模型I的热源，而排气和缸套冷却水的废热用作模型II的热源。需要注意的是，在固定蒸发温度范围内，R1234ze(E)的工作压力远高于R1233zd(E)、R1234ze(Z)和R245fa。此外，对于模型I，使用R1234ze(E)的系统净功率输出最小，而对于模型II，其净功率输出变为最大。另外，R1234ze(Z)和R1233zd(E)都可作为R245fa的良好替代工作流体，因为R1234ze(Z)、R1233zd(E)和R245fa具有相近的工作压力、最大净功率输出和最低平准化能源成本。与模型I相比，在模型II中，R1233ed(E)和R1234ze(Z)的[此处原文可能缺失部分内容]分别降低了10.8%和9.9%，R1233ed(E)和R1234ze(Z)的[此处原文可能缺失部分内容]分别降低了11.5%和10.1%。然而，在所研究的四种工作流体中，R1233zd(E)在模型I和模型II中的最短投资回收期都是最长的。
