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Performance Analysis of a Multistage Centrifugal Pump Used in an Organic Rankine Cycle (ORC) System under Various Condensation Conditions

  • Yuxin Yang
  • Hongguang ZhangEmail author
  • Guohong TianEmail author
  • Yonghong Xu
  • Chongyao Wang
  • Jianbing Gao
Article
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Abstract

In an organic Rankine cycle (ORC) system, the working fluid pump plays an important role in the system performance. This paper focused on the operating characteristics of a multistage centrifugal pump at various speeds and condensation conditions. The experimental investigation was carried out to assess the influence of the performance of the pump by the ORC system with special attention to actual net power output, thermal efficiency as well as back work ratio (BWR). The results showed that an increase in the pump speed led to an increase in the mass flow rate and expand in the operating range of the outlet pressure. The mass flow rate decreased nonlinearly with the increase of the outlet pressure from 0.22 to 2.41 MPa; the electric power consumption changed between 151.54 and 2409.34 W and the mechanical efficiency of the pump changed from 7.90% to 61.88% when the pump speed varied from 1160 to 2900 r/min. Furthermore, at lower pump specific speed the ORC system achieved higher thermal efficiency, which suggested that an ultra-low specific speed pump was a promising candidate for an ORC system. The results also suggested that the effects of condensation conditions on the pump performance decreased with the pump speed increasing and BWR was relatively sensitive to the condensation conditions, especially at low pump speed.

Keywords

waste heat recovery organic Rankine cycle multistage centrifugal pump operating characteristics various condensation conditions back work ratio (BWR

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Notes

Acknowledgements

This work was sponsored by the National Natural Science Foundation of China (Grant No. 51776005), the National Key R&D Program of China (Grant No. 2016YFE0124900).

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Copyright information

© Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.College of Environmental and Energy Engineering, MOE (Ministry of Education) Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Beijing Key Laboratory of Heat Transfer and Energy ConversionBeijing University of TechnologyBeijingChina
  2. 2.Collaborative Innovation Center of Electric Vehicles in BeijingBeijingChina
  3. 3.Department of Mechanical Engineering SciencesUniversity of SurreyGuildfordUK
  4. 4.School of Electrical and Mechanical EngineeringBeijing Information Science and Technology UniversityBeijingChina

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