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

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

Applied Energy, 1991, vol. 40, issue 2, 118 pages

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°.

Date: 1991
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