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    Entropy generation minimization: A practical approach for performance evaluation of temperature cascaded co-generation plants

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    Type
    Article
    Authors
    Myat, Aung
    Thu, Kyaw
    Kim, Youngdeuk
    Saha, Bidyut Baran
    Ng, K. C.
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2012-10
    Permanent link to this record
    http://hdl.handle.net/10754/562345
    
    Metadata
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    Abstract
    We present a practical tool that employs entropy generation minimization (EGM) approach for an in-depth performance evaluation of a co-generation plant with a temperature-cascaded concept. Co-generation plant produces useful effect production sequentially, i.e., (i) electricity from the micro-turbines, (ii) low pressure steam at 250 °C or about 8-10 bars, (iii) cooling capacity of 4 refrigeration tones (Rtons) and (iv) dehumidification of outdoor air for air conditioned space. The main objective is to configure the most efficient configuration of producing power and heat. We employed entropy generation minimization (EGM) which reflects to minimize the dissipative losses and maximize the cycle efficiency of the individual thermally activated systems. The minimization of dissipative losses or EGM is performed in two steps namely, (i) adjusting heat source temperatures for the heat-fired cycles and (ii) the use of Genetic Algorithm (GA), to seek out the sensitivity of heat transfer areas, flow rates of working fluids, inlet temperatures of heat sources and coolant, etc., over the anticipated range of operation to achieve maximum efficiency. With EGM equipped with GA, we verified that the local minimization of entropy generation individually at each of the heat-activated processes would lead to the maximum efficiency of the system. © 2012.
    Citation
    Myat, A., Thu, K., Kim, Y. D., Saha, B. B., & Choon Ng, K. (2012). Entropy generation minimization: A practical approach for performance evaluation of temperature cascaded co-generation plants. Energy, 46(1), 493–521. doi:10.1016/j.energy.2012.07.062
    Sponsors
    The authors gratefully express the gratitude to Agency of Science, Technology and Research (A*STAR) for their generous financial support for the project (Grant Number R-265-000-287-305).
    Publisher
    Elsevier BV
    Journal
    Energy
    DOI
    10.1016/j.energy.2012.07.062
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.energy.2012.07.062
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Water Desalination and Reuse Research Center (WDRC)

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