ENGINEERING RESEARCH INSTITUTE UNIVERSITY OF MICHIGAN ANN ARBOR SUPPLEMENTARY REPORT STUDIES TO EVALUATE HEAT-TRANSFIE COEFFICIENTS OF INSULATED PANELS IV A. B, EPPLE *. Associate Professor of Mechanical Engineering Project 2017 GIFFELS AND VALLET, INC. Detroit, Michigan June, 1954

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ENGINEERING RESEARCH INSTITUTE * UNIVERSITY OF MICHIGAN SUPPLEMENTARY REPORT STUDIES TO EVALUATE BEAT-TRANSFER COEFFICIENTS OF INSULATED PANELS IV This report covers work done under Project 2017-8-9, "leat-Transfer Coefficients of Insulated Panels IV," sponsoredaby Giffels and Vallet, Incorporated. Wheeling Steel Corporation and The Steelcraft Manufacturing Company each submitted a panel for test. The tabulation below gives the results of the tests. Type Drawing Overall Transmission Manurfac tireTr MaufactrPanel Number Rate Btu/Hr//sq ft/OF Steelcraflt Mfg Co, Job A-l1800-C Manufacturing Co. C Sheet 31.154 Wheeling Steel Corp,, B 18-3772,.242 DESCRIPTION OF PANELS AND ASSEBLIES All units were erected on wood supporting aembers to set them approximately two feet above the floor line The Steelcraft panels were assembled by factory representatives and the Wheeling Steel panels were viewed and approved by the General Manager after they were assembled by University sheetmetal workers. Differences in panel construction and assembly may be seen from the following descriptions: Steelcraft Manufacturing Felt strips 1/4-inch thick were used to isolate angles from the panel sides in assembling this box. Perf~orated sheet-mtal channels separated the outside and inside metal facing of individual panels. The 3-inch space _____________________ 1 ___

ENGINEERING RESEARCH INSTITUTE * UNIVERSITY OF MICHIGAN between facings was fi.lled with Fiberglas. Calking compound was also spread on the inside of the corner angles before they were assembled. Wheeling Steel Corp. No felt or calking compound was used in the construction or assembly of this box. As required with the "B" type panel, the top and bottom.extend all the way across the side panels. The metal facings were separated by two inches of Fiberglas and were joined at the sides by a weld in a 1/4-inch hole Of an embossing, A Nepne gaket separated the individual panels from each other at the joint. INSIDE DIENSIOm AND SUTFACE AREAS OF PAEL ASS LISES Length Width He ight Area (sq ft) Steelcraft Mfg, Co, 87 405 46.5 131.3 Wheeling Steel Corp. 87 40.5 46,5 131.3 INSTRUM ATION AND EQ'JIM Instrumentation and equipment are the same as those described in the Report of Studies to Evaluate ilat —Lransfer Coefficients of Ins-ulated Panels I, Project M905 PROCEDURE Procedure followed is also described in report on Project M905. RESULTS The following table is a summary of the principal results used to calculate the overall coefficient of heat'transfer _____________________________________ 2 _____

ENGINEERING RESEARCH INSTITUTE ~ UNIVERSITY OF MICHIGAN SUtMMARY OF RESULTS Sner Istie Ro Inside U Input Air Air Area (Btu)/((Er) _ Btu/l~X' T Oxt ~F Temp. aF S Ft (Sq Ft)/ (_F) Steeltraft Mfg, Co. 15T 161i4 83.5 131*3 *.1 Wheeling Steel p. 1810 1482 9110 1313.242

UNIVERSITY OF MICHIGAN 3 9015 0226 63III 111 3 9015 02826 6636