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Homework Help: Efficiency of Otto Cycle

  1. Oct 17, 2012 #1
    1. The problem statement, all variables and given/known data
    Estimate the change in volume of carbon dioxide if 'r' is increased from 10 to 11 (10% increase).

    Assume 30 million cars, all use 1m^3 of fuel each year

    2. Relevant equations

    Efficiency of an Otto Cycle

    3. The attempt at a solution

    Original η=1-10^(1-gamma)
    Final η=1-11^(1-gamma)

    I then looked up a typical value of gamma (1.3), and worked out the efficiency of each

    Original = 0.4988
    Final = 0.5129

    Not sure if this is right, as you weren't given the value of gamma.

    Then I'm not entirely sure how to work out how much CO2 is produced from each m^3 of fuel, is it just multiplying by the efficiency?
    Or have I gone completely wrong?
  2. jcsd
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