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second law efficieny of HE
3 barg pressure of steam, water available at 80°C. Celsius- giuppi
- Post #16
- Forum: Heat Transfer & Thermodynamics engineering
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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...- giuppi
- Post #12
- Forum: Heat Transfer & Thermodynamics engineering
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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...- giuppi
- Post #7
- Forum: Heat Transfer & Thermodynamics engineering
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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...- giuppi
- Thread
- Replies: 16
- Forum: Heat Transfer & Thermodynamics engineering
