Experimental study on low-temperature organic Rankine cycle utilizing scroll type expander
Experimental study on low-temperature organic Rankine cycle utilizing scroll type expander
复制标题
DOI：
10.1016/j.apenergy.2015.05.118
复制
发表时间：
2015-10
期刊：
影响因子：
11.2
通讯作者：
Jen‐Chieh Chang;T. Hung;Ya-Ling He;Wenping Zhang
中科院分区：
文献类型：
--
作者：
Jen‐Chieh Chang;T. Hung;Ya-Ling He;Wenping Zhang
研究了开式涡旋式膨胀机在有机朗肯循环(ORC)系统中的性能。膨胀机最初是一台无油涡旋式空压机，内置体积比为4.05。该循环使用HFC-245fa作为工质，循环中混合了中等浓度的制冷剂油。本研究的实验结果主要分为两部分：第一部分重点研究了不同系统压差和膨胀机转速对膨胀机进口固定过热度的影响。第二部分涉及膨胀机入口的各种过热，该膨胀机以固定的转速和5千巴和6千巴的工作压差运行。当循环运行在固定过热度条件下时，膨胀机的最大循环效率为9.44%，膨胀机效率为73.1%，最大输出功率为2.3kW。另一方面，当膨胀机运行在不同过热度条件下时，膨胀机和循环效率随着过热度的增大而同时提高。此外，本文不仅对现有膨胀机的实验结果进行了重点分析，还结合前人的实验数据和本文的研究，针对100℃以下热源的不同工作压差，确定了一种合适的涡旋式膨胀机。
This paper focuses on experimental performance of an open-drive scroll type expander in an organic Rankine cycle (ORC) system. The expander was an originally oil-free scroll type air compressor with a built-in volume ratio of 4.05. The cycle used HFC-245fa as working fluid, and the loop has been mixed with a moderate concentration of refrigerant oil that circulated in the cycle. The experimental results of this study are divided into two main parts: first part focuses the experimental performance on the fixed superheating at the expander inlet with respect to various pressure differences of the system and rotational speeds of the expander. Second part involves various superheating at the expander inlet which was operated at fixed rotational speed and operating pressure difference of 5 bars and 6 bars. When the cycle was operated under fixed superheating conditions, the maximum cycle efficiency, expander efficiency and power output of the expander are 9.44%, 73.1% and 2.3 kW respectively. On the other hand, when the expander is operated in various superheating conditions, the expander and cycle efficiency simultaneously increase with the increasing of superheating. In addition, this paper not only focuses on the experimental results using the current expander, but also integrates the previous experimental data with present study to identify an appropriate scroll type expander with respect to various operating pressure differences for the heat source below 100 °C.