a thermal power station operates on the following cycle . Water is pumped into a
ID: 1819205 • Letter: A
Question
a thermal power station operates on the following cycle . Water is pumped into a boiler where it is converted to high pressure , hightemperature steam turbine that addition from the combustion of coal . the steam is expanded in a steam turbine is condensed back to water in a condenser by rejecting heat before it is pumped back to the boiler .a) identify the signs of the heat and work transfer interaction occurring during the cycle , taking the water/steam as the system ?
b) if 5000 MW of thermal energy are added to the water in the boiler , 3500 MW are rejected in the condenser , and the additional heat losses from the cycle are 500 MW , what is the net power plant ? what is the thermal efficiency of the power plant ?
c) if the pump power is 1000 kW , what is the turbine power output ?
Explanation / Answer
a)1-2 process (pump) Work done on the system so work is negative 2-3 Process (boiler) heat transfer is positive 3-4 process(Work done by the system so work is positive) 4-1 Process (turbine) heat transfer is negative ------------------------------------------------------------------------------------------------------- b) Net =5000-3500-500=1000 MW Efficiency =1-(Qc/QH) =1-(3500/5000) =0.3 heat transfer is negative ------------------------------------------------------------------------------------------------------- b) Net =5000-3500-500=1000 MW Efficiency =1-(Qc/QH) =1-(3500/5000) =0.3Related Questions
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