Answer to Question #221990 in Mechanical Engineering for Omelatum

Question

A steam turbine receives 362,500 kg/h of steam throttled at 8.7 MPa and 410 leaves the pressure 0 turbine shell at 2 MPa with 7.58 degrees of superheat. Reheated steam is at 1.9 MPa and 410 C. Condensate is at 78 0 C. For generator output of 100 MW at 94% efficiency, calculate (a) the combined thermal efficiency, (b) the actual condition of exhaust steam, (c) the thermal efficiency of the ideal engine, (d) the combined engine efficiency, and (e) the ideal thermal efficiency of the cycle without pressure drop through reheater

Answer 1

mass rate = 362,500 kg/hr

P_e = 8.7 MPa

T_e = 410°C = 410 + 273 = 683K

P_o = 2MPa

T_o = 758°C

P_r = 1.9MPa

T_r = 410°C

Thermal Efficiency = $\dfrac{758-410}{758}= 45.9\%$