| Loss in B. t. u. per pound | = | W | ( | 212 | - | t | + | 970.4 | + | .47 | (T - 212) | ) | (33) |
| Where | W | = | per cent of moisture in coal, |
| t | = | the temperature of air in the boiler room, [Pg 260] | |
| T [Pg 261] | = | temperature of the flue gases, | |
| .47 | = | the specific heat of superheated steam at the atmosphericpressure and at the flue gas temperature, | |
| (212-t) | = | B. t. u. necessary to heat one pound of water from thetemperature of the boiler room to 212 degrees, | |
| 970.4 | = | B. t. u. necessary to evaporate one pound of water at 212degrees to steam at atmospheric pressure, | |
| .47(T-212) | = | B. t. u. necessary to superheat one pound of steam atatmospheric pressure from 212 degrees to temperature T. | |
Portion of 15,000 Horse-power Installation of Babcock & Wilcox Boilers, Equipped with Babcock & Wilcox Chain Grate Stokers at the Northumberland, Pa., Plant of the Atlas Portland Cement Co. This Company Operates a Total of 24,000 Horse Power of Babcock & Wilcox Boilers in its Various Plants
(B) Loss due to heat carried away in the steam produced by the burning of the hydrogen component of the fuel. In burning, one pound of hydrogen unites with 8 pounds of oxygen to form 9 pounds of steam. Following the reasoning of item (A), therefore, this loss will be:
| Loss in B. t. u. per pound | = | 9H | ( | (212 - t) | + | 970.4 | + | .47 | (T - 212) | ) | (34) |
| Where | H | = | the percentage by weight of hydrogen. |
This item is frequently considered as a part of the unaccounted for loss, where an ultimate analysis of the fuel is not given.
(C) Loss due to heat carried away by dry chimney gases. This is dependent upon the weight of gas per pound of coal which may be determined by formula ([16]), page [158].