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+// Y.V.C.Rao ,1997.Chemical Engineering Thermodynamics.Universities Press,Hyderabad,India.

+

+//Chapter-5,Example 14,Page 182

+//Title: Power output of turbine

+//================================================================================================================

+clear 

+clc

+

+//INPUT

+P=3;//pressure of superheated steam in MPa

+T_enter=300;//entrance temperature of superheated steam in degree celsius

+T_exit=45;//final temperature at which the steam leaves in degree celsisus

+m=1;//mass flow rate of steam in kg/s

+

+//CALCULATION

+

+//From steam tables corresponding to P and T_enter

+si=6.5422;//entropy of steam at the entrance in kJ/kgK

+hi=2995.1;//entahlpy of steam at the entrance in kJ/kg

+

+//From steam tables corresponding to T_exit

+sf=0.6383;//entropy of saturated liquid in kJ/kgK

+hf=188.35;//enthalpy of saturated liquid in kJ/kg

+sg=8.1661;//entropy of saturated vapour in kJ/kgK

+hg=2583.3;//entahlpy of saturayed vapour in kJ/kg

+

+Xe=(si-sf)/(sg-sf);//calculation of quality of steam at the exit (no unit)

+he=((1-Xe)*hf)+(Xe*hg);//calculation of enthalpy of steam at the exit in kJ/kg

+Ws=-m*(he-hi);//calculation of power output from turbine using the first law of thermodynamics on the control-volume in kW

+

+//OUTPUT

+mprintf("\n The power output from the turbine=%0.1f kW\n",Ws);

+

+

+//===============================================END OF PROGRAM===================================================