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Experimental Investigation of a 300 kW Organic Rankine Cycle Unit with Radial Turbine for Low-Grade Waste Heat Recovery

1
School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China
2
Beijing Huahang Shengshi Energy Technology Co., Ltd., Beijing 100191, China
3
Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, Ministry of Education, North China Electric Power University, Beijing 102206, China
*
Authors to whom correspondence should be addressed.
Entropy 2019, 21(6), 619; https://doi.org/10.3390/e21060619
Received: 10 May 2019 / Revised: 15 June 2019 / Accepted: 21 June 2019 / Published: 23 June 2019
(This article belongs to the Special Issue Thermodynamics of Thermoelectric Devices and Applications)
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Abstract

The performance of a 300 kW organic Rankine cycle (ORC) prototype was experimentally investigated for low-grade waste heat recovery in industry. The prototype employed a specially developed single-stage radial turbine that was integrated with a semi-hermetic three-phase asynchronous generator. R245fa was selected as the working fluid and hot water was adopted to imitate the low-grade waste heat source. Under approximately constant cooling source operating conditions, variations of the ORC performance with diverse operating parameters of the heat source (including temperature and volume flow rate) were evaluated. Results revealed that the gross generating efficiency and electric power output could be improved by using a higher heat source temperature and volume flow rate. In the present experimental research, the maximum electric power output of 301 kW was achieved when the heat source temperature was 121 °C. The corresponding turbine isentropic efficiency and gross generating efficiency were up to 88.6% and 9.4%, respectively. Furthermore, the gross generating efficiency accounted for 40% of the ideal Carnot efficiency. The maximum electric power output yielded the optimum gross generating efficiency. View Full-Text
Keywords: waste heat recovery; organic Rankine cycle (ORC); heat source temperature and volume flow rate; single-stage radial turbine; electric power output; isentropic efficiency waste heat recovery; organic Rankine cycle (ORC); heat source temperature and volume flow rate; single-stage radial turbine; electric power output; isentropic efficiency
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wang, R.; Kuang, G.; Zhu, L.; Wang, S.; Zhao, J. Experimental Investigation of a 300 kW Organic Rankine Cycle Unit with Radial Turbine for Low-Grade Waste Heat Recovery. Entropy 2019, 21, 619.

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