Ocean thermal energy conversion systems are expected to be the next-generation energy production systems. In these systems, a plate heat exchanger is used for improving the power generation efficiency, and ammonia or an ammonia/water mixture is used as a working fluid. In this study, boiling heat transfer coefficients of pure ammonia are measured on a vertical flat PHE (a plate heat exchanger), for elucidating and characterizing the behavior of ammonia on a compact plate evaporator, a type of PHE. The measurement results show that local boiling heat transfer coefficients increase with increasing vapor quality. Further, the effects of saturation pressure, mass flow rate, and average heat flux on the boiling heat transfer coefficient are elucidated. An empirical correlation for the local boiling heat transfer coefficient is derived using the Lockhart-Martinelli parameter. Further, a visualization experiment of boiling phenomena of ammonia is performed to elucidate the relation between boiling behavior and heat transfer.


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    Title :

    Local boiling heat transfer characteristics of ammonia in a vertical plate evaporator


    Additional title:

    Lokaler Siedewärmeübergang von Ammoniak in einem senkrechten Plattenverdampfer


    Contributors:
    Arima, H. (author) / Kim, J.H. (author) / Okamoto, A. (author) / Ikegami, Y. (author)

    Published in:

    Publication date :

    2010


    Size :

    12 Seiten, 16 Bilder, 1 Tabelle, 18 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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