. The steam-engine and other heat-motors. r from t\ to it at that temperature and then superheat it under aconstant pressure (corresponding to T2) to some temperature Ta is #, = + .305(7\>-32)-(*i-32) + AS(TS-T2) ,orH=H2 + A8(T*-T2). Intensity of Superheating Required.—If L= latent heat of steamentering a cylinder, .4 = its weight in pounds per stroke, x = the 436 THE STEAM-ENGINE AND OTHER HEAT-MOTORS percentage of initial condensation, then xAL = the amount of heatlost by the steam in condensing. i \ ~~ri \ i i i I fi V- \ £ V \ V3 .4 \ A > \ \\ \ 5-
. The steam-engine and other heat-motors. r from t\ to it at that temperature and then superheat it under aconstant pressure (corresponding to T2) to some temperature Ta is #, = + .305(7\>-32)-(*i-32) + AS(TS-T2) ,orH=H2 + A8(T*-T2). Intensity of Superheating Required.—If L= latent heat of steamentering a cylinder, .4 = its weight in pounds per stroke, x = the 436 THE STEAM-ENGINE AND OTHER HEAT-MOTORS percentage of initial condensation, then xAL = the amount of heatlost by the steam in condensing. i \ ~~ri \ i i i I fi V- \ £ V \ V3 .4 \ A > \ \\ \ 5- I £ * V, \ ^ \ *?> ^ \ o ?/ % fi N \\ \ S>J 6, n •»x x% *•»*. V / -- ^^ >.„ - ~~ ~~ — -_- .- 55^ J- / 2i ?41 J5_ 01 nr *- — — _ ~- Z- _- — ~T- -; <; £.-Fig. 228.—Cp of Superheated Steam. (Knoblauch and Jacobs.) 752°F<. Fig. 229.—Separately Fired Superheater. If superheated steam had to possess that number of thermalunits in excess of those it possesses as saturated steam, it is evident SUPERHEATED STEAM AND STEAM-TURBINES. 437 that the necessary temperature of the superheated steam wouldbe obtained from the equation MA(Ta-Tj-xAL, or (T8-T2)=^ where Ts is the temperature of the superheated steam,T2 is the temperature of the saturated steam. If the above were true there would be very little gained bythe use of superheated steam, as we would simply substitute one
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