A proposed steam power plant design consists of an ideal Rankine cycle with reheat and regeneration....

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Mechanical Engineering

A proposed steam power plant design consists of an ideal Rankinecycle with reheat and regeneration. Steam enters Turbine 1 at P1and T1 at the rate of m1 and exits at P2. A fraction (y') of thesteam exiting Turbine 1 is diverted to an open feedwater heaterwhile the remainder is reheated to T3 before entering Turbine 2.The condenser operates at P4. Saturated liquid exits the condenserand is fed to Pump 1. The outlet of Pump 1 is fed into the openfeedwater heater. Saturated liquid exits the feedwater heater andis fed to Pump 2. All turbines and pumps are isentropic.

--Given Values--
m1 (kg/s) = 50
P1 (Bar) = 140
T1 (C) = 560
P2 (Bar) = 10
T3 (C) = 500
P4 (Bar) = 0.08

a) Determine the specific enthalpy (kJ/kg) at the inlet ofturbine 1.
  
b) Determine the specific enthalpy (kJ/kg) at the exit of turbine1.
  
c) Determine the specific enthalpy (kJ/kg) at the inlet of turbine2 .
  
d) Determine the specific enthalpy (kJ/kg) at the exit of turbine2.
  
e) Determine the specific enthalpy (kJ/kg) at the condenserexit.
  
f) Determine the specific enthalpy (kJ/kg) at the exit of the lowpressure pump.
  
g) Determine the specific enthalpy (kJ/kg) at the exit of thefeedwater heater.
  
h) Determine the specific enthalpy (kJ/kg) at the exit of the highpressure pump.
  
i) Determine the fraction (y') of flow diverted to the openfeedwater heater.
  
j) Determine the power (MW) produced by turbine 1.
  
k) DeteRmine the power (MW) produced by turbine 2.
  
l) Determine the power (kW) required (a positive number) by the lowpressure pump.
  
m) Determine the power (kW) required (a positive number) by thehigh pressure pump.
  
n) Determine the total rate of heat transfer (MW) supplied to theboiler.
  
o) Determine the thermal efficiency (%) of the power plant.
  

Answer & Explanation Solved by verified expert
4.5 Ratings (962 Votes)
Consider below TS diagram for further discussionTo calculate properties at various points steam table is usedand wherever required interpolation is performeda Specific enthalpy at point1 is enthalpy atP1 140 bar and T1 560 deg C specific enthalpyh1 34875 kJkgb Specific enthalpy at exit of turbine1ie Point 2 can be found by isentopic process 12 as turbineis isentropichence s2 s1 s1 entropy at P1 T1 65968 kJ    See Answer
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