A steam power plant operates on a theoretical reheat cycle as shown below. Steam enters high pressure turbine at 150 bar and 550°C (h3 = 3450 kJ/kg) and expands upto 40 bar (h=3050 kJ/kg). It is reheated at constant pressure to 550°C (h5 = 3560 kJ/kg) and expands through the low pressure turbine to a condenser at 0.1 bar (h= 2300 kJ/kg). Also given, h (at 0.1 bar) = 191.8 kJ/kg. Thermal efficiency (in %) and steam rate (kg/kWh) of the plant neglecting pump work are, respectively

Elements Of Electromagnetics
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176 A steam power plant operates on a theoretical reheat cycle as shown below. Steam enters high
pressure turbine at 150 bar and 550°C (h3 = 3450 kJ/kg) and expands upto 40 bar (h₂=3050 kJ/kg).
It is reheated at constant pressure to 550°C (h₂ = 3560 kJ/kg) and expands through the low
pressure turbine to a condenser at 0.1 bar (h = 2300 kJ/kg).
Also given, h (at 0.1 bar) = 191.8 kJ/kg.
Thermal efficiency (in %) and steam rate (kg/kWh) of the plant neglecting pump work
are, respectively
(a) 44.05 and 4.34
(c) 42.10 and 3.10
24
N
Boiler
Reheater
Σ
Pump
h4
h3 = 3450 kJ/kg
= 3050 kJ/kg Turbine
h
= 3560 kJ/kg
Condenser
6 h₂ = 2300 kJ/kg
(b) 48.10 and 5.12
(d) 44.05 and 2.17
Transcribed Image Text:176 A steam power plant operates on a theoretical reheat cycle as shown below. Steam enters high pressure turbine at 150 bar and 550°C (h3 = 3450 kJ/kg) and expands upto 40 bar (h₂=3050 kJ/kg). It is reheated at constant pressure to 550°C (h₂ = 3560 kJ/kg) and expands through the low pressure turbine to a condenser at 0.1 bar (h = 2300 kJ/kg). Also given, h (at 0.1 bar) = 191.8 kJ/kg. Thermal efficiency (in %) and steam rate (kg/kWh) of the plant neglecting pump work are, respectively (a) 44.05 and 4.34 (c) 42.10 and 3.10 24 N Boiler Reheater Σ Pump h4 h3 = 3450 kJ/kg = 3050 kJ/kg Turbine h = 3560 kJ/kg Condenser 6 h₂ = 2300 kJ/kg (b) 48.10 and 5.12 (d) 44.05 and 2.17
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