Project ForgeThermodynamics
First Law of Thermodynamics
GATE 2017
Medium
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/kW·h) of the cycle is __________.
3.6 kg/kW·h(± 0.1 accepted)
Explanation
Net work = (turbine work) − (pump work) = (2803−1800) − (124−121) = 1003−3 = 1000 kJ/kg. Specific steam consumption = 3600/Wnet = 3600/1000 = 3.6 kg/kW·h.
Source: GATE ME 2017 Session 2 (ME-2) (2017)
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