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Find the maximum thermodynamic efficiency

  1. Apr 22, 2016 #1
    1. The problem statement, all variables and given/known data
    If an engine operates between 250°C and 25°C, what is its maximum thermodynamic efficiency?


    2. Relevant equations
    Ec=1-Tc/Th
    3. The attempt at a solution
    1-25/250
    =90%
    or
    1-(25+273)/(250+273)
    =43%

    In this question,which one should I use K or ºC ?
    thank you
     
  2. jcsd
  3. Apr 22, 2016 #2

    SteamKing

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    What does Carnot's Theorem say about this?

    https://en.wikipedia.org/wiki/Carnot's_theorem_(thermodynamics)
     
  4. Apr 22, 2016 #3
    If you always use Kelvin you will avoid ever worrying about this again. Always just convert to Kelvin before doing anything else and you won't go wrong. The only time to use Celsius in thermodynamics or heat transfer is if the question want the answer in Celsisus - in that case convert to Celsius at the very last step after using Kelvin for calculations.
     
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