. The steam-engine and other heat-motors . at feed-water from t\ to T2,evaporate it at that temperature and then superheat it under aconstant pressure (corresponding to T2) to some temperature Ts is // = + .305(T2-32)-(*1-32) + .48(T,-7Y> ,or Hs=H2+A8(T8-T2). Intensity of Superheating Required.—If L = latent heat of steamentering a cylinder, A = 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. 1 \ li \ l 1 i 1 *2 V 3»> \\ \ 1 c *7^ / * r*
. The steam-engine and other heat-motors . at feed-water from t\ to T2,evaporate it at that temperature and then superheat it under aconstant pressure (corresponding to T2) to some temperature Ts is // = + .305(T2-32)-(*1-32) + .48(T,-7Y> ,or Hs=H2+A8(T8-T2). Intensity of Superheating Required.—If L = latent heat of steamentering a cylinder, A = 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. 1 \ li \ l 1 i 1 *2 V 3»> \\ \ 1 c *7^ / * r* \ V \ #t \ o ?/ -V s V \ s V ^ >&* »N, v- ^ •v. — sr- S^*l^ V / -- .«._ ?*„ - -» — zz z~ - -,- --^;S^>^ s / 21 •47 /h * ?— — — — ~J -- -?^_ ~~ r^ C- •* •Ji er in. At IS. — — — __ ?~; J^- ,c. 14 23 Lbb _^ 0. hs 482° 572° 60;r 212 °F 302 JF Temperature —>Fig. 228.—Cp of Superheated Steam. (Knoblauch and Jacobs.) 752°Ri. Fig. 229.—Separately Fired 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-TURBIXES. 437 that the necessary temperature of the superheated steam wouldbe obtained from the equation ASA(Ts-T2)=xAL, or (Ts-T2)=~£ where Ts is the temperature of the superheated steam,To 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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