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Optimal thermal-insulation placement of district-heating pipes and their support baffles in air-filled trenches

Author

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  • Jaber, J. O.
  • Babus'Haq, R. F.
  • Probert, S. D.

Abstract

Steady-state conductive-convective heat transfers across a relatively cold, horizontal, rectangular cavity enclosing two relatively hot, horizontal pipes have been determined experimentally. By employing the displacement ratios of the two pipes (designated [`]h' for the hot one and [`]w' for the warm one relative to the mean temperature of the enclosure) as variables, the optimal configuration, i.e. that which achieves the minimum steady-state rate of heat loss from the hot pipe for the considered conditions was deduced to occur when the two pipes were placed one above the other at Eh = 0·70 and Ew = 0·03, and half-way between the vertical walls. The effective resistance of the air in the cavity can be further enhanced via the insertion of two pairs of low-conductivity, radial baffles, each supporting one pipe. The optimal angles of inclination for the baffles for this purpose were achieved at [Theta]h = ±48° and [Theta]w = ±60°.

Suggested Citation

  • Jaber, J. O. & Babus'Haq, R. F. & Probert, S. D., 1991. "Optimal thermal-insulation placement of district-heating pipes and their support baffles in air-filled trenches," Applied Energy, Elsevier, vol. 40(2), pages 111-118.
    • Handle: RePEc:eee:appene:v:40:y:1991:i:2:p:111-118
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