A two-dimensional melting of a technical-grade phase-change material is modeled. The phase-change material is placed in the annular space formed by an outer regular hexagonal tube and an inner tube. A nonorthogonal boundary fitted coordinate method is implemented on a staggered grid arrangement. The mushy region of the impure phase-change material has been accommodated through the enthalpy-porosity scheme. A set of parametric studies is carried out. Selected results are presented as a function of time for the velocity and temperature fields, the cumulatively stored energy, the total melt fraction, and the average Nusselt number on the inner tube. The oblate-shaped inner tube results in the highest melting rate and stores the maximum energy among the studied units irrespective of the shape and vertical position of the inner tube. Among the three vertical positions of the inner circular tube, when the center of the inner tube is placed at one-third height from the base of the outer tube, it shows the greatest thermal efficiency, and the worst performance is obtained for the upper position of the inner tube at the two-thirds height of the outer tube. With the increase in the Rayleigh number (wall temperature), the amount of energy storage is enhanced.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Energy Storage by Melting Commercial Change Phase Materials in Hexagonal-Shaped Heat Exchangers


    Contributors:

    Published in:

    Publication date :

    2018-03-12


    Size :

    18 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Heat transfer enhancement in phase-change heat exchangers

    Rafał Chatys / Milan Malcho / Łukasz J. Orman | DOAJ | 2014

    Free access

    Aluminum foam-phase change material composites as heat exchangers

    Hong,S.T. / Herling,D.R. / Pacific Northwest National Laboratory,US | Automotive engineering | 2007


    Aluminum Foam-Phase Change Material Composites as Heat Exchangers

    Herling, Darrell R. / Hong, Sung-Tae | SAE Technical Papers | 2007


    Experimental Investigation of Ice Phase Change Material Heat Exchangers

    Leimkuehler, Thomas / Stephan, Ryan | AIAA | 2012


    Experimental Investigation of Ice Phase Change Material Heat Exchangers

    Leimkuehler, T. / Stephan, R. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2012