Transactions of the American Society of Heating And Ventilating Engineers
Transactions of the American Society of Heating And Ventilating Engineers
American Society of Heating And Ventilating Engineers
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in. of surface, the total loss would be 0.113 X 36,000 =. 4068 -watts. The total loss per day would be 4068 X 24 X 3600, or 3.52 X 10« joules. One pound of coal has a heating value of approximately 12,500 B.t.u. = 1.32 X 10^ joules. Consequently the loss in pounds of coal per day would be 3.52 X 10* -4- 1.32 X 10% or 26.6. This would be equivalent to about 75 bu. during the heating season. The loss through a bare pipe would be equivalent to 100 -7-137 (see Table 2) of this value, or about 54 bu.... These considerations indicate, therefore, that the pipe system in question covered with 0.33-mm. sheet asbestos will lose during a winter season a quantity of heat equivalent to that obtained from 20 bu. of coal more than the same system would lose if left uncovered. Similar calculations to those just made lead to the following re- sults. A layer of asbestos about 0.4 in. thick, seven layers of sheet asbestos (0.013 in.) applied loosely, or three layers of 0.25 in. air-cell asbestos, will reduce the loss through the bright tin surface thus covered to only 75 per cent of what it would be if the pipe were left bare.
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