KODUCTION. 



p t x - q 



Initial 165 366 .990 1185.0 2.726 



Final 2 126 ;v, 899.1 *J7 -4 



-m^itl into work 285. 9 



implc 4. Required tht of discharge from a nozzle which 



takes steam at 1 50 ; jxmnN by the gauge and expands down to 26 inches 

 of vacuum; thr initial priming being .01 and the barometer being at 



3 ini 



< availal : the same as that for the previous problem, namely, 



285.9 E.T.I, for an adiabatic expansion. .The velocity without fr 



1 be 



V - V2 X 32.2 X 778 X 285.9 - 3786. 



If an allowance of ten JXT rent U made for friction the velocity 

 will be 



V - V 2 x 32.2 ^5.9 - 3500. 



The sj>< In me at exit can be found as follows: The heat that 



would be changed into work with an allowance of ten per cent for friction 

 will be 



0.90 X 285.9 - 257.2 B.T.U. 

 Subtracting from the initial 'tents leaves 



1185 - 257 - 928 B.T.U. 



for the heat at i26F. at the discharge, and this property is 



found for the 1 ntropy i .60; the correspond i : <>lume is 142 cubic 



Example 5. Suppose that the con -f example 3 are applied 



to a stcam-turhim- which has four pressure stages. For adiabatic expan- 

 thi' available heat JKT stage will be 



285.9 + 4 - 7' 4 B.T.U. 



This quantity may be subtracted four times successively from the 

 initial heat contents and the results will be the heat contents for the 



