Calculation of Turbine Efficiency

1. Calculation of Turbine Efficiency
Data Available: -
Inlet steam flow = 67.5Te/hr
Inlet steam pressure = 108.5 Kg/cm
2
g
Inlet steam temperature = 501 °C
Extraction steam flow = 49 Te/hr
Extraction steam pressure = 25 Kg/cm
2
g
Extraction steam temperature= 334 °C
Condensed steam flow = 18.5 Te/hr
Condensed steam pressure = -0.91 Kg/cm
2
g
Condensed steam temperature= 43.76 °C
Data required on above basis
(P = 108.5 Kg/cm
2
g, T = 501°C)
Enthalpy of I/L steam Ei = 804 Kcal/Kg
Entropy of I/L steam Eni = 1.5657 Kcal/Kg °K

(P = 25 Kg/cm
2
g, T = 334°C)
Enthalpy of I/L steam Eex = 737 Kcal/Kg
Entropy of I/L steam Enex = 1.6194 Kcal/Kg °K
(P = -0.91 Kg/cm
2
g, T = 43.8°C)
Enthalpy of I/L steam Ec = 617 Kcal/Kg
Entropy of I/L steam Enc = 1.94887 Kcal/Kg °K
1.Efficiency calculation of extraction section
We calculate first an enthalpy at isentropic condition (P = 25 Kg/cm
2
g, Eni = 1.5657 Kcal/Kg °K)
Eis
η = (Ei - Eex) / (Ei - Eis) * 100
= (804-737) / (804-705) * 100
η = 67 %
2.Efficiency calculation of condensing section