Handbook of Ship Calculations Construction And Operation a book of Reference F
Handbook of Ship Calculations Construction And Operation a book of Reference F
Charles Haynes Hughes
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1117. To convert 8. 03 lb. Of water into U. S. Gallons divide by 8. 33, as one U. S. Gallon i weighs 8. 33 lb. Thus |^£ = . 96 gallon o . Oo Pounds of Coal Required to Evaporate One Pound or One Gallon of Water into Steam. Let T = steam temperature, and t = feed water temperature Then units of heat = 1115 + . 3 (T - t) Example. The steam pressure in a Scotch boiler is 160 lb. And the tempera- ture 370°. The feed water temperature is 140°. Find the units of heat required to evaporate one pound o...f water into steam, and the number of pounds of water evaporated by one pound of coal. Units of heat required per pound of coal = 1115 4- . 3 (370° — 140°) = 1086. Assume that one pound of coal gives out 9, 000 units of heat (B. T. U. ) 9000 Then — — = 8. 28 lb. Of water or . 99 gallon are evaporated per pound of coal. Coal Consumption. — The coal required per indicated horse power per hour in good practice is between 1. 5 to 2. 0 lb. Let C = pounds of coal per i. H. P. Per hour H = i.
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