where CO_{2}, O, CO and H are the percentage by volume as determined by the flue gas analysis and C is the percentage by weight of carbon in the dry fuel. Hence the weight of gas per pound of coal will be, (11×14.33+8×4.54+7(0.11+81.02)) (-----------------------------)×78.57 = 13.7 pounds. ( 3(14.33+0.11) ) Therefore the loss of heat in the dry gases carried up the chimney = 13.7×0.24(480-81) = 1311 B. t. u., = 9.22 per cent. (D) The loss due to incomplete combustion as evidenced by the presence of CO in the flue gas analysis is: 0.11 ----------×.7857×10,150 = 61. B. t. u., 14.33+0.11 = .43 per cent. (E) The loss due to unconsumed carbon in the ash: The analysis of the ash showed 17.9 per cent to be combustible matter, all of which is assumed to be carbon. The test showed 10.00 of the total dry fuel fired to be ash. Hence 10.00×.179 = 1.79 per cent of the total fuel represents the proportion of this total unconsumed in the ash and the loss due to this cause is 1.79 per cent × 14,600 = 261 B. t. u., = 1.83 per cent. The heat absorbed by the boilers per pound of dry fuel is 11.71×970.4 = 11,363 B. t. u. This quantity plus losses (A), (B), (C), (D) and (E), or 11,363+22+618+1311+61+261 = 13,636 B. t. u. accounted for. The heat value of the coal, 14,225 B. t. u., less 13,636 B. t. u., leaves 589 B. t. u., unaccounted for losses, or 4.15 per cent. The heat balance should be arranged in the form indicated by Table 58. TABLE 58 HEAT BALANCE B. T. U. PER POUND DRY COAL 14,225 +----------------------------------------------------------------------+ |+--------------------------------------------------------------------+| || |B. t. u.|Per Cent|| |+--------------------------------------------------+--------+--------+| ||Heat absorbed by Boiler | 11,363 | 79.88 || ||Loss due to Evaporation of Moisture in Fuel | 22 | 0.15 || ||Loss due to Moisture formed by Burning of Hydrogen| 618 | 4.34 || ||Loss due to Heat carried away in Dry Chimney Gases| 1311 | 9.22 || ||Loss due to Incomplete Combustion of Carbon | 61 | 0.43 || ||Loss due to Unconsumed Carbon in the Ash | 261 | 1.83 || ||Loss due to Radiation and Unaccounted Losses | 589 | 4.15 || |+--------------------------------------------------+--------+--------+| ||Total | 14,225 | 100.00 || |+--------------------------------------------------+--------+--------+| +----------------------------------------------------------------------+