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US Army Corps of Engineers® Cold Regions Research & Engineering Labórate UBRAEI AUG2T W0 -DrT^TöT^ecrämäüon ..K w ag igcsa. Two-Dimensional AnalyslroTNatural Convection and Radiation in Utilidors Paul W. Richmond June 1999 n an Abstract: Central heating plants are often used on large building complexes such as university campuses or military bases. Utilidors can be used to contain heat distribution lines and other utilities between a utility sta­tion and serviced buildings. Traditional thermal analy­sis of utilidors is one-dimensional, with heat transfer correlations used to estimate the effects of convection, radiation, and two-dimensional geometric effects. The expanding capabilities of computers and numerical methods suggest that more detailed analysis and pos­sibly more energy-efficient designs could be obtained. This work examines current methods of estimating the convection and radiation that occur across an air space in square and rectangular enclosures and compares them with numerical and experimental data. Cover: Construction of a utilidor at Eielson AFB, Alaska. (Photo courtesy of Dr. Gary Phetteplace.) How to get copies of CRREL technical publications: Department of Defense personnel and contractors may order reports through the Defense Technical Information Center: DTIC-BR SUITE 0944 8725 JOHN J KINGMAN RD FT BELVOIRVA 22060-6218 Telephone 1 800 225 3842 E-mail help@dtlc.mil msorders@dtic.mll WWW http://www.dtic.mil/ All others may order reports through the National Technical Information Service: NTIS 5285 PORT ROYAL RD SPRINGFIELD VA 22161 Telephone 1 800 553 6847 or 1 703 605 6000 1 703 487 4639 (TDD for the hearing-impaired) E-mail orders@ntis.fedworld.gov WWW http://www.ntis.gov A complete list of all CRREL technical publications is available from USACRREL (CEERD-IM-HL) 72 LYME RD HANOVER NH 03755-1290 Telephone 1 603 646 4338 E-mail techpubs@crrel.usace.army.mil For information on all aspects of the Cold Regions Research and Engineering Laboratory