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Homework Help: Compare efficiencies of petrol/Dieselstirling

  1. Oct 4, 2011 #1
    1. The problem statement, all variables and given/known data

    FOR THE SAME HIGH AND LOW OPERATING TEMPERATURE LIMITS, compare the efficiencies of petrol , Diesel, and stirling engines

    2. Relevant equations



    3. The attempt at a solution
    the efficiency of petrol as i found is : η=1-[1/(r^(δ-1))]
    the efficiency of Diesel : η={1-[1/(r^(δ-1))]}* {((αδ)-1)/(δ(α-1))
    stirling : η= R Ln(v2/v1)(T2-T1)/ Cv(T2-T1)+R T2 Ln (v2/v1)

    So how can i compare them mathematically ?
     
  2. jcsd
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