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Homework Help: Carnot Engine temperature

  1. Apr 6, 2010 #1
    1. The problem statement, all variables and given/known data
    Two heat engines operating on Carnot cycles are arranged in series. The first engine A receives heat at 927 deg C and rejects heat to a reservoir at a temperature T. The second engine B receives the heat rejected by the first engine, and in turn rejects heat to a reservoir at 27 deg C.


    2. Relevant equations
    Calculate the temperature T, in deg C, for the situation where:
    a)The work outputs of the two engines are equal
    b)The effeciencies of the two engines are equal


    3. The attempt at a solution
    I have completely lost the plot with this and really need help!
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Apr 6, 2010 #2

    Andrew Mason

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    Science Advisor
    Homework Helper

    What is the efficiency of a Carnot engine? Write out the efficiencies of each engine. For A, it can be expressed in terms of Th (927C) and T. For B, it is expressed in terms of T and Tc (27C).

    What is the work generated in terms of the engine's efficiency? (Hint: efficiency is output / input).

    AM
     
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