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Carnot engine problem

  1. Mar 8, 2010 #1
    1. The problem statement, all variables and given/known data
    The exhaust temperature of a Carnot heat engine is 401◦ C.
    What is the intake temperature if the efficiency of the engine is 40.2 %?
    Answer in units of ◦ C.


    2. Relevant equations

    e = 1 - Tc/Th (all in Kelvin)


    3. The attempt at a solution
    0.402 = 1 - Tc/ (401+273) = 1 - Tc/674
    Tc = 0.598 * 674 = 403.052
    Tc in C = 403.052-273 = 130.052

    But somehow this answer seems to be wrong on the quest. This is my last problem ..please help? What am I doing wrong? Am I missing something?
     
  2. jcsd
  3. Mar 8, 2010 #2

    rock.freak667

    User Avatar
    Homework Helper

    You were given Tc to get Th, not the other way around like you did.
     
  4. Mar 8, 2010 #3
    Thanks .. that worked.
     
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