 Thermal design of district-heating distribution networksA.J. Neale, R.F. Babus'Haq, S.D. Probert and M.J. Shilston Applied Energy, 1987, vol. 28, issue 4, 269-282 Abstract: The behaviour of a double-pipe arrangement, consisting of a hot supply pipe and a warm return pipe enclosed within a relatively cold, rectangular, air-filled trench was considered. The minimum rates of steady-state heat losses occurred with the supply and the return pipes at displacement ratios Es = 0·45 and Er = -0·38 respectively; the hot pipe being in the upper region and the warm pipe vertically below it. The pipes were symmetrically placed with respect to the side walls. There is an optimal separation of 11·4 mm ± 1·1 mm for the gap between the supply and the return pipes for the temperature ranges and component sizes employed. This interesting result agrees quantitatively with those from previous experimental studies, but its significance had not been realised previously. By employing this optimal arrangement, a reduction in the total rate of heat loss from the supply pipe was obtained compared with that from this pipe placed anywhere else in the enclosure, but with similar temperatures for the pipes and trench walls as in the optimal arrangement. Date: 1987 Downloads: (external link) Related works: Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text Persistent link: https://EconPapers.repec.org/RePEc:eee:appene:v:28:y:1987:i:4:p:269-282 Ordering information: This journal article can be ordered from Access Statistics for this article Applied Energy is currently edited by J. Yan More articles in Applied Energy from Elsevier |
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