Handbook of thermodynamic tables and diagrams; a selection of tables and diagrams from Engineering thermodynamics . 0 Upper Line=Temperature for Saturation,Lower Line=At)SQlute Pressures Chart 36.—Heat per Pound of Steam above Feed Temperature. Evaporation per Hourper Boiler Horse-power. Factor of Evaporation. Each of the upper curves gives directly the total heat per pound of steam above 32°and the distance between them and the lower curve intercept, that for any feed-water tem-perature, by a vertical distance. If, therefore, AB be the total heat for the steam above32° at 100 lbs. per sq. in.
Handbook of thermodynamic tables and diagrams; a selection of tables and diagrams from Engineering thermodynamics . 0 Upper Line=Temperature for Saturation,Lower Line=At)SQlute Pressures Chart 36.—Heat per Pound of Steam above Feed Temperature. Evaporation per Hourper Boiler Horse-power. Factor of Evaporation. Each of the upper curves gives directly the total heat per pound of steam above 32°and the distance between them and the lower curve intercept, that for any feed-water tem-perature, by a vertical distance. If, therefore, AB be the total heat for the steam above32° at 100 lbs. per sq. in. absolute and 20° superheat and DE the heat of Hquid at 200° temperature above 32°, then AC, the vertical distance between these two points, is theheat per pound of steam above the feed temperature 200° F. for 100 lbs. steam with 20°superheat. This can be marked on a slip of paper and read off on the extra scale to theright in terms of, heat in , or factor of evaporation, or actual weight of water thatmust be evaporated per hour to give a boiler horse-power. 188 HANDBOOK OF THERMODYNAMIC. 5 6 7 8 9 10 11 12 13 14 15 16 Evaporation From & at 212°F, per Square Foot of Heating Surface per Hour, Chart 37.—^Heat Balance for Locomotive Boiler Workine Under Various Rates of Evaporation, TABLES AND DIAGRAMS 189 eoi o o / o / y / / o / /J o y X n— o^ i^ 10 15 20 Lbs. Air per Lb. of Coal HX) 700Plue Gas Temperature 800 Co 1005^ o Boiler ^ Thornj-croft Boiler S s 8054 s V ^ S n 5^ •^ ^., N ?&Q >-v + ?^ RO^, 90^. X ^ \ N, \J V >» ?s V. X V ^ X >^ <^ xFurnace TemperatunoFlue Gas «« 1 Furnace Temperatur e mi i^ 00 :i5|oO 2^ 27^30 2^00 2900 755^ =3 V 555^ 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16Lbs. Water Evaporated from and at 212°F. per Sq .Ft . Heating Surf, per Hr. •^ A y / / y / / / 10 11 % CO2 in Flue Gases 12
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