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Highest possible efficiency of an engine

  1. Sep 18, 2014 #1
    1. The problem statement, all variables and given/known data
    The highest theoretical efficiency of an engine is

    e=(TH-TC)/TH

    where TH is the highest and TC is the lowest temperature during the circuit process. In a test car with a stirling engine the highest temperature during the circuit process is 700 °C and the lowest temperature is 100 °C. Calculate the highest possible efficiency.

    2. Relevant equations
    e=(TH-TC)/TH

    3. The attempt at a solution
    1 – 100/700 = 85,7%

    But apparently the answer should be 61,7%. What other factors needs to be included here?
     
    Last edited: Sep 18, 2014
  2. jcsd
  3. Sep 18, 2014 #2

    billy_joule

    User Avatar
    Science Advisor

    Do you know the SI unit for temperature?
     
  4. Sep 18, 2014 #3
    Ah yes. Of course. Thank you!
     
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