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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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    9. Wang, Zhiqi & Pan, Huihui & Xia, Xiaoxia & Xie, Baoqi & Peng, Deqi & Yang, Huya, 2022. "Experimental investigation on steady and dynamic performance of organic Rankine cycle with R245fa/R141b under different cooling and expander speed conditions," Energy, Elsevier, vol. 241(C).
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    11. 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).
    12. Zhang, Xuefeng & Wang, Liwei & Zhu, Hanyu, 2022. "Investigation on a novel pumpless module driven by thermal energy and gravity and its application in an ORC system," Renewable Energy, Elsevier, vol. 195(C), pages 476-487.
    13. Feng, Yong-qiang & Hung, Tzu-Chen & Su, Ting-Ying & Wang, Shuang & Wang, Qian & Yang, Shih-Cheng & Lin, Jaw-Ren & Lin, Chih-Hung, 2017. "Experimental investigation of a R245fa-based organic Rankine cycle adapting two operation strategies: Stand alone and grid connect," Energy, Elsevier, vol. 141(C), pages 1239-1253.
    14. Jiang, L. & Lu, H.T. & Wang, L.W. & Gao, P. & Zhu, F.Q. & Wang, R.Z. & Roskilly, A.P., 2017. "Investigation on a small-scale pumpless Organic Rankine Cycle (ORC) system driven by the low temperature heat source," Applied Energy, Elsevier, vol. 195(C), pages 478-486.
    15. Bao, Huashan & Ma, Zhiwei & Roskilly, Anthony Paul, 2017. "Chemisorption power generation driven by low grade heat – Theoretical analysis and comparison with pumpless ORC," Applied Energy, Elsevier, vol. 186(P3), pages 282-290.

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