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Homework Help: Thermodynamics: Brayton Refrigeration Cycle with Regenerator

  1. Nov 13, 2016 #1
    I have a brayton refrigeration cycle with a regeneator same as the picture below only with irreversible regenrator, compressor and turbine (And different values).
    The given in my problem are:
    Ti=0 C, T3= 35 C, T5= -80 C, mass flow rate m= 0.4 kg/s
    Turbine efficiency Et=0.85, Compressor efficiency =0.8 and pressure ratio =5
    I found h1=273.3 KJ/Kg, h2=552.27 KJ/Kg, h3= 308.5 KJ/Kg, h5=193 KJ/kg
    I need to find the regenerator effectiveness
    My question are:
    1-How to find h4 and h6
    2-What is the regenrator efficiency in this case

    I know if the regenerator was ideal the h4=h1, but I am unable to find the real h4, maybe it has to do with the turbine efficiency but I only have the real h5 I need h5s to find h4...
    As fir the regenerator effectiveness I thought it would be Et=(h1-h3)/(h4-h3).. as h4 approaches h1, the effectiveness approaches 1
  2. jcsd
  3. Nov 13, 2016 #2
    Also, specific heats are at room temperature
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