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  1. giuppi

    second law efficieny of HE

    3 barg pressure of steam, water available at 80°C. Celsius
  2. giuppi

    second law efficieny of HE

    KoachCSR According to the equation you wrote, you can also write ΔS = (-QH/TH) + (QL/TL) that is QH=QL=Q if we suppose a HE without losses towards ambient, so ΔS = (-Q/TH) + (Q/TL) = Q (1/TL - 1/TH) = Q (TH - TL) / (TH*TL). This states, as I said, that entropy is proportional to the mean...
  3. giuppi

    second law efficieny of HE

    thanks everyone for replies The second law efficency basically is like KoachCSR said, the exergy, so we are referring about entropy. in this Paint file I try to explain better what I mean. I figure A the steam condensates at costant temp and water rise temp. Entropy is proportional to the...
  4. giuppi

    second law efficieny of HE

    Hello everyone! If I need to heat water, for example from 50° to 70° with a shell and tube HE, what is the more efficient primary fluid to be used, in terms of second law efficiency? Hot water or Steam (e.g. 3 bar). I would say hot water but I am not so sure. The system considered is only the...

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