. The steam-engine and other heat-motors. curve s37Ymay be found. The curve when drawn to the usual scale ispractically a straight line and mav be so assumed. That being the Q case the value of e^e5 = T.+T* 2 If this steam expands adiabatically the line Tafs2mi indicates J the thermal changes that occur. When the temperature dropped to h the intersecting of the vertical and the saturated steam lines show that at that instant the steam is dry saturated steam. 1 Further expansion to ti is followed by the condensation of a part of the steam equal in amount to of a pound. 442 THE STEAM-ENGINE AND
. The steam-engine and other heat-motors. curve s37Ymay be found. The curve when drawn to the usual scale ispractically a straight line and mav be so assumed. That being the Q case the value of e^e5 = T.+T* 2 If this steam expands adiabatically the line Tafs2mi indicates J the thermal changes that occur. When the temperature dropped to h the intersecting of the vertical and the saturated steam lines show that at that instant the steam is dry saturated steam. 1 Further expansion to ti is followed by the condensation of a part of the steam equal in amount to of a pound. 442 THE STEAM-ENGINE AND OTHER HEAT-MOTORS. m±t\ If the fraction equation Mi x, its value may be obtained from the or eoe5 = e0ei +€^5 = eoe3 +e3^4 +64e5, whence x may be determined. The efficiency of the added heat is theoretically ** 3. If the practical gain were no greater than this superheaters wouldnot repay their cost and trouble. Superheated Steam in Compound Engines.—It is practical tosuperheat steam to such a temperature that it will be superheated. eiexe5 Fig. 231. at exhaust-opening in the high-pressure cylinder, but it wouldnot be practical, nor is it indeed necessary, to have the initialtemperature so high that the steam is superheated at cut-off inthe low-pressure cylinder. It is better to divide the superheatinginto two stages and put superheating coils in the receiver betweenthe two cylinders. Elsewhere it has been pointed out that anymoisture in the steam from the high-pressure cylinder should beseparated out so that the superheating is only applied to drysaturated steam. It was further pointed out that the receiver SUPERHEATED STEAM AXD STEAM-TURBIXES. 443 steam should be superheated from 50 to LOO degrees; this wouldrequire square feet of pipe surface to the Durability of Superheaters.—Superheaters are best preservedby keeping a continual supply of steam flowing through amount of this steam should be proportional to the amountof coal burning on the grate. I
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