Question

Two hundred kg/min of steam enters a steam turbine at 350 ° C and 40bar through a 7.5-cm diameter line and exits at 75 ° C and 6.5bar through a 5-cm line. The exiting stream may be vapor, liquid, or “ wet steam ”. (a) If the exiting stream were wet steam at 6.5bar, what would its temperature be? (b) How much energy is transferred to or from the turbine? (Neglect Δ E p but not Δ E k .)

Answer 1

a) If exiting stream may be vapor, liquid or wet steam there would not be any change in the temperature as per the phase change the temperature and pressure remains constant during the phase change so here at exit point when temperature maintaining 75 C and 6.5 bar pressure the wet steam also maintains same conditions of temperature and pressures by phase rule.