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Experimental investigation of the impact of lubricant oil ratio on subcritical organic Rankine cycle for low-temperature waste heat recovery

Author

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  • Yang, Jingye
  • Yu, Binbin
  • Ye, Zhenhong
  • Shi, Junye
  • Chen, Jiangping

Abstract

Organic Rankine cycle can be used to harness waste heat to generate electricity. The cycle performance is dependent on expander behavior, where the design of lubricant oil loop is significant. The effects of oil on expansion machine rely on the prevention of leakages and friction losses. However, the lubricant oil is inevitably mixed with refrigerant, which may in turn affect system performance. This paper is targeted to investigate the impact of lubricant oil ratios on a 2 kW ORC prototype using R245fa as working fluid. The heat source temperature is fixed at 125 °C. Two degrees of freedom including the mass flow rate and expander rotational speed are adjusted to explore the system performance. Cycle thermal efficiency, expander isentropic efficiency, filling factor and heat transfer performance are analyzed. The results show that injection of lubricant oil has significant influence on the organic Rankine cycle system. The optimum cycle thermal efficiency is 4.7%, which is obtained under high oil ratio. The system efficiency is more sensitive under lower lubricant oil charges, as 10.25% increase in cycle thermal efficiency is observed when oil-concentration varies from 0.12% to 1%. The hermetic scroll expander is more sensitive to various oil-concentration than the plate heat exchanger.

Suggested Citation

  • Yang, Jingye & Yu, Binbin & Ye, Zhenhong & Shi, Junye & Chen, Jiangping, 2019. "Experimental investigation of the impact of lubricant oil ratio on subcritical organic Rankine cycle for low-temperature waste heat recovery," Energy, Elsevier, vol. 188(C).
    • Handle: RePEc:eee:energy:v:188:y:2019:i:c:s0360544219317943
    DOI: 10.1016/j.energy.2019.116099
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    Cited by:

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    4. Obara, Shin'ya & Tanaka, Ryu, 2021. "Waste heat recovery system for nuclear power plants using the gas hydrate heat cycle," Applied Energy, Elsevier, vol. 292(C).
    5. Ali Naseri & Ramin Moradi & Luca Cioccolanti & Alison Subiantoro, 2023. "Impact of the Lubricant on a Modified Revolving Vane Expander (M-RVE) in an Organic Rankine Cycle System," Energies, MDPI, vol. 16(14), pages 1-17, July.
    6. Uemura, Yuta & Kawasaki, Toshiyuki & Obara, Shin’ya, 2021. "Analysis of the performance of an electricity generation system using the CO2 hydrate formation and dissociation process for heat recover," Energy, Elsevier, vol. 218(C).
    7. Lei, Biao & Yu, Hai-bin & Li, Guo-qiang & Wu, Yu-Ting & Wang, Wei, 2022. "Thermodynamic investigations on internal generator cooling for hermetic expanders in Organic Rankine Cycles," Energy, Elsevier, vol. 251(C).

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