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Heat transfer enhancement in medium temperature thermal energy storage system using a multitube heat transfer array

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  • Agyenim, Francis
  • Eames, Philip
  • Smyth, Mervyn

Abstract

An experimental energy storage system has been designed using an horizontal shell and tube heat exchanger incorporating a medium temperature phase change material (PCM) with a melting point of 117.7°C. Two experimental configurations consisting of a control unit with one heat transfer tube and a multitube unit with four heat transfer tubes were studied. The thermal characteristics in the systems have been analysed using isothermal contour plots and temperature time curves. Temperature gradients along the three directions of the shell and tube systems; axial, radial and angular directions have been analysed and compared. The phase change in the multitube system was dominated by the effect of convective heat transfer compared to conductive heat transfer in the control system. The temperature gradient in the PCM during phase change was greatest in the radial direction for both the control and multitube systems. The temperature gradients recorded in the axial direction for the control and multitube systems during the change of phase were respectively 2.5 and 3.5% that of the radial direction, indicating essentially a two-dimensional heat transfer in the PCM. The onset of natural convection through the formation of multiple convective cells in the multitube system significantly altered the shape of the solid liquid interface fluid flow and indicates the requirement for an in-depth study of multitube arrangements.

Suggested Citation

  • Agyenim, Francis & Eames, Philip & Smyth, Mervyn, 2010. "Heat transfer enhancement in medium temperature thermal energy storage system using a multitube heat transfer array," Renewable Energy, Elsevier, vol. 35(1), pages 198-207.
    • Handle: RePEc:eee:renene:v:35:y:2010:i:1:p:198-207
    DOI: 10.1016/j.renene.2009.03.010
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    References listed on IDEAS

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