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Homework Help: Thermodynamics (Ideal Rankine Cycle)

  1. Jul 22, 2010 #1
    1. An ideal reheat Rankine cycle operates between the pressure limits of 10 KPa and 8 MPa, with reheat occurring at 4 MPa. The temperature of steam at the inlets of both turbines is 500C, and the enthalpy of steam is 3185 KJ/kg at the exit of the high-pressure turbine, and 2247 KJ/kg at the exit of the low-pressure turbine. Disregarding the pump work, the cycle efficiency is
    a.) 32 percent b.) 29 percent c.) 49 percent d.) 41 percent

    2. Relevent Equations
    Nrankine = Wnet / Qin = (Qin - Qout)/Qin
    s2 = sf@pressure + x(sfg@pressure)
    h2 = hf@pressure + x(hfg@pressure)

    3. The attempt at a solution
    Not really sure where to start. I did one before this that is just a simple Rankine cycle without the reheat. The reheating is what throws me off. Any help would be appreciated
  2. jcsd
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