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Experimental investigation on a small pumpless ORC (organic rankine cycle) system driven by the low temperature heat source

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  • Gao, P.
  • Wang, L.W.
  • Wang, R.Z.
  • Jiang, L.
  • Zhou, Z.S.

Abstract

A small pumpless ORC (organic rankine cycle) system with different scroll expanders modified from compressors of the automobile air-conditioner is established, and the refrigerant R245fa is chosen as the working fluid. Different hot water temperatures of 80, 85, 90 and 95 °C are employed to drive the pumpless ORC system. Experimental results show that a maximum shaft power of 361.0 W is obtained under the hot water temperature of 95 °C, whereas the average shaft power is 155.8 W. The maximum energy efficiency of 2.3% and the maximum exergy efficiency of 12.8% are obtained at the hot water temperature of 90 °C. Meanwhile a test rig for investigating the mechanical loss of the scroll expander is established. The torque caused by the internal mechanical friction of the expander is about 0.4 N m. Additionally, another scroll expander with a displacement of 86ml/r is also employed to investigate how scroll expander displacement influences the performance of the pumpless ORC system. Finally, the performance of the pumpless ORC system is compared with that of the conventional ORC system, and experimental results show that the small pumpless ORC system has more advantages for the low-grade heat recovery.

Suggested Citation

  • Gao, P. & Wang, L.W. & Wang, R.Z. & Jiang, L. & Zhou, Z.S., 2015. "Experimental investigation on a small pumpless ORC (organic rankine cycle) system driven by the low temperature heat source," Energy, Elsevier, vol. 91(C), pages 324-333.
    • Handle: RePEc:eee:energy:v:91:y:2015:i:c:p:324-333
    DOI: 10.1016/j.energy.2015.08.076
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    References listed on IDEAS

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    Cited by:

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    10. Wang, Z.X. & Li, H.Y. & Zhang, X.F. & Wang, L.W. & Du, S. & Fang, C., 2020. "Performance analysis on a novel micro-scale combined cooling, heating and power (CCHP) system for domestic utilization driven by biomass energy," Renewable Energy, Elsevier, vol. 156(C), pages 1215-1232.
    11. Wang, Z.X. & Du, S. & Wang, L.W. & Chen, X., 2020. "Parameter analysis of an ammonia-water power cycle with a gravity assisted thermal driven “pump” for low-grade heat recovery," Renewable Energy, Elsevier, vol. 146(C), pages 651-661.
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    13. Zhang, Xuefeng & Wang, Liwei & Wang, Zixuan & Wang, Lemin & Zhang, Zihan, 2022. "Non-steady thermodynamic characteristics of a pilot-scale organic Rankine cycle system with a thermally-driven pump," Energy, Elsevier, vol. 252(C).
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