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研究低GWP工作流体作为R245fa在有机Rankine循环应用中的替代品

Min-Hsiung Yang¹, Ming-Chuan Liu¹, Rong-Hua Yeh²

¹Dept. of Naval Architecture and Ocean Engineering, National Kaohsiung University of Science and Technology, Taiwan, China.

|August 5, 2024

概括

本研究评估了低全球变暖潜力 (GWP) 制冷剂R1233zd(E),R1234ze(Z和R1234ze(E作为有机兰金循环 (ORC) 系统中R245fa的替代品. 由于性能和成本指标相似,R1234ze (Z) 和R1233zd (E) 显示出作为有效替代品的希望.

科学领域:

热力学是一种热力学.
能源系统工程能源系统工程
环境科学环境科学

背景情况:

有机兰金循环 (ORC) 系统对于废热回收至关重要.
传统工作流体R245fa因其全球变暖潜力 (GWP) 而面临环境审查.
确定具有可比性或优异性能的可持续替代品是必不可少的.

研究的目的:

为了进行三种低GWP制冷剂 (R1233zd(E),R1234ze(Z),R1234ze(E)) 的热经济评估,作为ORC系统中R245fa的替代品.
在两个不同的热源模型下分析这些替代品的性能和经济可行性.

主要方法:

使用R1233zd(E),R1234ze(Z) 和R1234ze(E) 的ORC系统的热经济分析与R245fa.
建模两个系统:模型I (柴油发电机排气热) 和模型II (排气和外套冷却水废热).
评估关键性能指标,包括工作压力,净功率输出,平衡能源成本 (LEC) 和回报期 (PB).

主要成果:

与R1233zd(E),R1234ze(Z) 和R245fa.相比,R1234ze(E) 的工作压力明显更高.
R1234ze(E) 在模型I中产生最小的净功率,但在模型II中产生最大功率.
R1234ze (Z) 和R1233zd (E) 显示了密切的工作压力,高净功率输出和低平衡的能源成本,使它们成为可行的R245fa替代品.
与模型I相比,模型II显示了R1233zd(E) 和R1234ze(Z) 的最小LEC和PB降低.
在这两种模型中,R1233zd(E) 是最长的最低回报期.

结论:

在ORC应用中,R1234ze (Z) 和R1233zd (E) 已被确定为R245fa的低GWP替代品,可提供具有竞争力的热经济性能.
热源的选择对不同制冷剂的性能和经济可行性产生重大影响.
为了全面的系统设计,需要对R1233zd(E) 的回报期进行进一步的调查.

关键词:

平衡能源成本是指平衡的能源成本.净输出功率输出功率的净值.偿还期的时间.性能参数的性能参数工作流体工作流体.

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