High Steam Pressures in Locomotive Service a Review of a Report to the Carnegie
High Steam Pressures in Locomotive Service a Review of a Report to the Carnegie
W F M William Freeman Myrick Goss
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12. Column 3 gives the number of thermal units in each Ib. Of steam at the several pressures assuming the feed-water in all cases to have had a temperature of 60 F. The values of this col- umn show at a glance the rate of change in the amount of heat required to supply steam at the different pressures embraced by the experiments. Column 4 gives the pounds of water from and at 212 F. Per in- dicated horse-power hour. It equals Column 2 X Column 3-^965. 8. Column 5 gives the pounds of water evapo...rated from and at 212 F. Per pound of coal and is calculated as follows: Assuming that a fair average load for the locomotive tests is 440 horse-power, and that this unit of power is delivered under all pressures, the cor- responding rate of evaporation may be found by multiplying this value by those of Column 4 and dividing by the area of heating- surface; that is, the rate of evaporation = 440 X Column 4 -j- 1322. The equivalent pounds of water per pound of coal is found by sub- stituting the rates of evaporation found for H in the equation, .
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