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Thermodynamic analysis of hybrid Rankine cycles using multiple heat sources of different temperatures

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  • Yue, Ting
  • Lior, Noam

Abstract

Past studies of hybrid power cycles using multiple heat sources of different temperatures focused mainly on case studies and almost no general theory about this type of systems was developed. This paper is a first comprehensive study of their general thermodynamic performance, with their comparison to their corresponding single temperature heat source reference system, focusing on three types of power cycles: simple Rankine cycle, Rankine cycle with reheat and Rankine cycle with heat regeneration. The generalized expressions for the energy and exergy efficiency differences between the hybrid and the corresponding single heat source system were developed. A number of simulation case studies were performed to help the understanding and confirm the thermodynamic generalization of the results. The results show that the energy and exergy efficiencies of the hybrid systems are higher than those of their corresponding single heat source reference systems if and only if the energy andexergy conversion efficiency (defined in the paper) of the additional heat source (AHS) is larger than that of the original heat source. The conditions that defined the effects of the AHS temperature and heat addition rate on the energy and exergy efficiencies of the hybrid systems as convex or concave curves were described. Comparisons across the first two types of hybrid power cycles were made, showing that the energy and exergy efficiencies of the reheat Rankine cycle is generally higher than that of the simple Rankine cycle as AHS is changed. Recommendations were made for obtaining the maximal energy and exergy efficiency as a function of the AHS temperature, of the heat addition rate by the AHS, and of the AHS position in the power cycle flow sheet. For the hybrid power generation systems with heat regeneration it was found that when using an AHS to raise the net system power by a given amount, using it to replace the higher-pressure extracted steam will result in a higher system energy efficiency than when using it to replace lower-pressure extracted steam. Hybrid cycles can have significantly lower emissions, cost, and fuel depletion.

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  • Yue, Ting & Lior, Noam, 2018. "Thermodynamic analysis of hybrid Rankine cycles using multiple heat sources of different temperatures," Applied Energy, Elsevier, vol. 222(C), pages 564-583.
    • Handle: RePEc:eee:appene:v:222:y:2018:i:c:p:564-583
    DOI: 10.1016/j.apenergy.2018.04.002
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    References listed on IDEAS

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    1. Yue, Ting & Lior, Noam, 2017. "Exergo economic analysis of solar-assisted hybrid power generation systems integrated with thermochemical fuel conversion," Applied Energy, Elsevier, vol. 191(C), pages 204-222.
    2. Baghernejad, A. & Yaghoubi, M., 2010. "Exergy analysis of an integrated solar combined cycle system," Renewable Energy, Elsevier, vol. 35(10), pages 2157-2164.
    3. Yue, Ting & Lior, Noam, 2017. "Exergo-economic competitiveness criteria for hybrid power cycles using multiple heat sources of different temperatures," Energy, Elsevier, vol. 135(C), pages 943-961.
    4. Yue, Ting & Lior, Noam, 2017. "Thermodynamic analysis of solar-assisted hybrid power generation systems integrated with thermochemical fuel conversion," Energy, Elsevier, vol. 118(C), pages 671-683.
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