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Study of mixtures based on hydrocarbons used in ORC (Organic Rankine Cycle) for engine waste heat recovery

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  • Shu, Gequn
  • Gao, Yuanyuan
  • Tian, Hua
  • Wei, Haiqiao
  • Liang, Xingyu

Abstract

For high temperature ORC (Organic Rankine Cycle) used in engine waste heat recovery, it's very critical to select a high temperature working fluid. HCs (Hydrocarbons) usually have excellent cycle performance, but the flammability limits their practical application. Considering that some retardants can be used to suppress flammability, the paper presents an application of mixtures based on hydrocarbons blending with refrigerant retardants to engine waste heat ORC. Three pure hydrocarbons (cyclopentane, cyclohexane, benzene) and two retardants (R11, R123) are selected for combination. Thermal efficiency and exergy loss are selected as the main objective functions. Based on thermodynamic model, the effects of retardants mass fraction, evaporation temperature and IHE (internal heat exchanger) are investigated. Results show that zeotropic mixtures do have higher thermal efficiency and lower exergy loss than pure fluids, at a certain mixture ratio. There exists the OMR (optimal mixture ratio) for different mixtures, and it changes with the evaporation temperature. When adding IHE to system, cycle performance could be obviously improved, and for benzene/R11 (0.7/0.3), the efficiency growth is about 7.12%∼9.72%. Using it, the maximum thermal efficiency of the system can achieve 16.7%, and minimum exergy loss is only 30.76 kW.

Suggested Citation

  • Shu, Gequn & Gao, Yuanyuan & Tian, Hua & Wei, Haiqiao & Liang, Xingyu, 2014. "Study of mixtures based on hydrocarbons used in ORC (Organic Rankine Cycle) for engine waste heat recovery," Energy, Elsevier, vol. 74(C), pages 428-438.
    • Handle: RePEc:eee:energy:v:74:y:2014:i:c:p:428-438
    DOI: 10.1016/j.energy.2014.07.007
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    References listed on IDEAS

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