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Research Article Experimental analysis of organic Rankine cycle power generation system with radial inflow turbine and R245fa Lei Li1,2,3 , Le-ren Tao1,3 and Qing-qing Liu1,3 Abstract Advances in Mechanical Engineering 2020, Vol. 12(5) 1–10 Ó The Author(s) 2020 DOI: 10.1177/1687814020921663 journals.sagepub.com/home/ade Small turbines must operate at high rotational speeds to generate adequate output power. In this study, a radial inflow turbine using R245fa as the working fluid is miniaturised and is designed to have a rotational speed of 30,000 r/min. The organic Rankine cycle system is not simplified, and a preheater and a superheater are installed. The turbine is experimen- tally analysed in the organic Rankine cycle system. The experimental results show that with an increase in the inlet pres- sure, the turbine output power and system efficiency increase; moreover, the turbine efficiency first decreases and then increases slightly after the pressure exceeds 1.5 MPa. The turbine efficiency decreases first and then increases and attains the minimum value at an inlet temperature of 100°C–105°C. When the flow rate is 0.82m3/s, the speed reaches its maximum value of 28,000 r/min, and a maximum output power of 17.37 kW is generated. The maximum efficiency of the turbine is 0.885 and that of the system is 0.1625. The experimental data and design parameters of the turbine pro- vide a reference for further design optimization. Keywords Organic Rankine cycle, radial inflow turbine, expander, performance analysis, R245fa Date received: 8 December 2019; accepted: 13 March 2020 Handling Editor: Jose Ramon Serrano Introduction In recent years, with the increasing shortage of energy and an increasing focus on environmental protection, energy efficiency and clean energy have attracted con- siderable attention as research topics. Organic Rankine cycle (ORC) power generation is an environmentally friendly power generation technology that does not pol- lute the environment.1 ORC power generation systems utilise the low boiling point of organic fluids to generate electricity, such as by using low-temperature industrial waste,2 geothermal energy,3 biomass4 and solar energy5 as heat sources. As ORC systems use water and air in the environment as cold sources, they do not consume non-renewable resources such as fossil fuels and nuclear energy. To convert low-temperature heat energy into avail- able energy, Yamamoto et al.6 used R123 instead of water as the circulating fluid in a Rankine cycle experi- ment. They observed that the R123 system exhibited better performance than water system when the tem- perature was lower than 120°C. In order to improve the total power generation, Shams Ghoreishi et al.7 1University of Shanghai for Science and Technology, Shanghai, China 2Zaozhuang University, Zaozhuang, China 3Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, Shanghai, China Corresponding author: Lei Li, University of Shanghai for Science and Technology, Shanghai 200093, China. Email: a7082928@126.com Creative Commons CC BY: This article is distributed under the terms of the Creative Commons Attribution 4.0 License (https://creativecommons.org/licenses/by/4.0/) which permits any use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).PDF Image | ORC analysis of radial inflow turbine and R245fa
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