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Organic Rankine cycle model for well-described and not-so-well-described working fluids

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  • Brignoli, Riccardo
  • Brown, J. Steven

Abstract

This paper presents an ORC (organic Rankine cycle) model consisting of turbine, condenser, pump, and boiler, with an optional IHX (internal heat exchanger). The model includes well-described (considerable experimental data) working fluids using the high accuracy EoS (equations of state) contained in REFPROP. Moreover, and more importantly, the model allows one to quickly and easily create from a few to many thousands of P-R (Peng-Robinson) EoS for not-so-well-described (little or no experimental data) working fluids. The latter is realized by parametrically varying critical temperature (Tc), critical pressure (Pc), acentric factor (ω), and ideal gas specific heat (cp,co). Simulation results for a low-temperature ORC application show that efficiency (η) increases with increasing heat source temperature (Tmax), and does so more strongly when an IHX is included; whereas, volumetric work output (V) decreases with increasing Tmax. The results further show that both η and V strongly decrease with increasing heat sink temperature (Tcond). Parametrically varying Tc, Pc, ω, and cp,co showed that: (1) Increasing Tc generally leads to higher η and lower V. (2) Increasing Pc monotonically increases V. (3) Variations in ω do not significantly impact η or V. (4) η and V both generally decrease with increasing values of cp,co.

Suggested Citation

  • Brignoli, Riccardo & Brown, J. Steven, 2015. "Organic Rankine cycle model for well-described and not-so-well-described working fluids," Energy, Elsevier, vol. 86(C), pages 93-104.
    • Handle: RePEc:eee:energy:v:86:y:2015:i:c:p:93-104
    DOI: 10.1016/j.energy.2015.03.119
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    References listed on IDEAS

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    Cited by:

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    2. White, M.T. & Oyewunmi, O.A. & Chatzopoulou, M.A. & Pantaleo, A.M. & Haslam, A.J. & Markides, C.N., 2018. "Computer-aided working-fluid design, thermodynamic optimisation and thermoeconomic assessment of ORC systems for waste-heat recovery," Energy, Elsevier, vol. 161(C), pages 1181-1198.
    3. Luo, Xianglong & Wang, Yupeng & Liang, Junwei & Qi, Ji & Su, Wen & Yang, Zhi & Chen, Jianyong & Wang, Chao & Chen, Ying, 2019. "Improved correlations for working fluid properties prediction and their application in performance evaluation of sub-critical Organic Rankine Cycle," Energy, Elsevier, vol. 174(C), pages 122-137.
    4. Yan, Yinlian & Yang, Fubin & Zhang, Hongguang & Pan, Yachao & Ping, Xu & Ge, Zhong, 2023. "Study on performance evaluation framework and design/ selection guidelines of working fluids for subcritical organic Rankine cycle from molecular structure perspective," Energy, Elsevier, vol. 282(C).
    5. Xu, Weicong & Zhao, Li & Mao, Samuel S. & Deng, Shuai, 2020. "Towards novel low temperature thermodynamic cycle: A critical review originated from organic Rankine cycle," Applied Energy, Elsevier, vol. 270(C).
    6. Martin T. White & Abdulnaser I. Sayma, 2018. "A Generalised Assessment of Working Fluids and Radial Turbines for Non-Recuperated Subcritical Organic Rankine Cycles," Energies, MDPI, vol. 11(4), pages 1-26, March.

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