786
VOI.. 28, NO. 7
INDUSTIIIAI, AND ENGINEEIIING CHEMISTRY
Mellon Institute and arc the arerage results of a number of test.s on each type of material. For convenience in ea,lculating heat losses for various ruean t.emperature conditions, the conductivity of a few of these insulations is r&en in Figure 3. The thickness of insalation required to prevent sweating on the above air duct for any of the insulat.ions whoso conductivities are included will be found to be directly proportional to conductivities of the insulations chosen and the insulation used in calculating the table. In conclusion, the author wishes to express his thanks to
It. \\-. Ortmiller who determined the conductivities of the various insulations. Literature Cited ~ ~xnt1. ~phys. i~ ~ b~anPcinl . , , R ~9 (1922). ~ ~ . (3 lieilmnn, R. H., Trans. Am. SOC.Mcch. Enzrs., F ~ S Yt e m (1) a r i s t h
Power. 51. 257 (1929). (')
HotteL 'I. 'L 'hid., 53(19b),
(1931).
February 11, 1936. Presented before the Symposium on Hest Transmission lield under the auspice8 of the Division of Industrial and Engi. neerinq Chemirtiy of tho Ameiiesn Chemiod Sooiety st Yale University, xer corm., neeember 30 and 31. lo:
