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Thermodynamic equipartition for increased second law efficiency

Author

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  • Thiel, Gregory P.
  • McGovern, Ronan K.
  • Zubair, Syed M.
  • Lienhard V, John H.

Abstract

In this work, a clear distinction is drawn between irreversibility associated with a finite mean driving force in a transport process and irreversibility associated with variance in the spatial and/or temporal distribution of this driving force. The portion of irreversibility associated with driving force variance is quantified via a newly defined dimensionless quantity, the equipartition factor. This equipartition factor, related to the variance in dimensionless driving force throughout the system, is employed to formulate an expression for second law efficiency. Consequently, the equipartition factor may be employed to identify the improvement in efficiency achievable via system redesign for a reduction in driving force variance, while holding fixed the system output for fixed system dimensions in time and space. It is shown that systems with low second law efficiency and low equipartition factor will have the greatest benefit from a redesign to obtain equipartition. The utility of the equipartition factor in identifying situations where efficiency can be increased without requiring a spatial or temporal increase in system size is illustrated through its application to several simple systems.

Suggested Citation

  • Thiel, Gregory P. & McGovern, Ronan K. & Zubair, Syed M. & Lienhard V, John H., 2014. "Thermodynamic equipartition for increased second law efficiency," Applied Energy, Elsevier, vol. 118(C), pages 292-299.
    • Handle: RePEc:eee:appene:v:118:y:2014:i:c:p:292-299
    DOI: 10.1016/j.apenergy.2013.12.033
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    References listed on IDEAS

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    1. Narayan, G. Prakash & Sharqawy, Mostafa H. & Summers, Edward K. & Lienhard, John H. & Zubair, Syed M. & Antar, M.A., 2010. "The potential of solar-driven humidification-dehumidification desalination for small-scale decentralized water production," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(4), pages 1187-1201, May.
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    Cited by:

    1. Wang, Zhe & Li, Yanzhong, 2016. "A combined method for surface selection and layer pattern optimization of a multistream plate-fin heat exchanger," Applied Energy, Elsevier, vol. 165(C), pages 815-827.
    2. Chen, Junjie & Han, Dong & Gao, Sijie & He, Weifeng & Peng, Tao, 2021. "Use of single air extraction and injection to thermodynamically balance the combined heat and mass transfer process," Energy, Elsevier, vol. 224(C).
    3. Swaminathan, Jaichander & Chung, Hyung Won & Warsinger, David M. & Lienhard V, John H., 2016. "Membrane distillation model based on heat exchanger theory and configuration comparison," Applied Energy, Elsevier, vol. 184(C), pages 491-505.

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