The document provides data on steam flows, pressures, and temperatures at the inlet, extraction, and condensing sections of a turbine. It then calculates the efficiencies of the extraction and condensing sections. For the extraction section, it calculates the inlet steam enthalpy, extraction steam enthalpy and entropy, and isentropic extraction steam enthalpy. Using these values, it determines the extraction section efficiency is 67%. For the condensing section, it states efficiency will be calculated but does not show the calculation.

1. Calculation of Turbine Efficiency
Data Available: -
Inlet steam flow = 67.5 Te/hr
Inlet steam pressure = 108.5 Kg/cm2
g
Inlet steam temperature = 501 °C
Extraction steam flow = 49 Te/hr
Extraction steam pressure = 25 Kg/cm2
g
Extraction steam temperature = 334 °C
Condensed steam flow = 18.5 Te/hr
Condensed steam pressure = -0.91 Kg/cm2
g
Condensed steam temperature = 43.76 °C
Data required on above basis
(P = 108.5 Kg/cm2
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/cm2
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/cm2
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/cm2
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