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In the Rankine cycle for a steam power plant the turbine entry and exit enthalpies are 2803 kJ/kg and 1800 kJ/kg, respectively. The enthalpies of water at pump entry and exit are 121 kJ/kg and 124 kJ/kg respectively. The specific steam consumption (in kg/kWh) of the cycle is______.
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- 3.6 kg/kW - h
- 2.6 kg/kW - h
- 4.6 kg/kW - h
- 3.1 kg/kW - h
Correct Option: A
Pump work
Wp = h2 – h1 = 124 – 121 = 3kJ/kg
Power output
wt = hu – hs = 2803 – 1800 = 1003 kJ/kg
Net output Wnet = wt – wp = 1003 – 3 = 1000 k
Specific steam consumption
| = | (kg / kW - h) = 3.6 kg/kW – h | Wnet |
