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Homework Help: Formula for otto cycle ang carnot engine

  1. Oct 17, 2007 #1
    hi i just want to know the formula of the otto cycle for the folowwing parameter:
    compression ratio,cycle work,heat added,heat rejection,thermal efficiency and mean effective pressure.

    and also may i know the formula for getting the pressure (bar) and the volume(m3/kg) temperature(K) for carnot engine, the cycle efficiency, heat added and work cycle?

    tanx for your help
  2. jcsd
  3. Oct 17, 2009 #2
    formula for otto cycle and carnot engine
    otto cycle thermal efficiency = 1- 1/ r^(gamma-1) where r = compression ratio =Cp/Cv
    heat added= Cv(T3-T2) kj/Kg
    Heat rejected =Cv(T4-T1)KJ/Kg
    m e p= Cv[(T3-T2)]-(T4-T1)]/(V1-V2)
    Carnot engine thermal efficienc= workdone/heat added = (R ln V3/V2)[Th-Tl]/R Th lnV3/V2
    w= [R ln v3/v2][Th-Tl] where Th = highest temp Tl = lowest temp.
    efficiency=( TH-TL)/TH
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