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Transient heat transfer in heat exchangers

  1. Jul 5, 2010 #1
    Considering an engine generating thermal heat at 140 kw and when the generation starts the thermal equilibrium of the engine will be distrubed , a radiator is installed to cool the engine this radiator cool the engine through flow of water and water is cooled inside a heat exchanger with air .
    I set a transient equation to my system but I am still unable to solve it please check my equation if it is correct and if there is anything missing .

    Qgen+mdot.cp water.(Tentring water - T exiting water)=[tex]\rho[/tex]C .V . dTengine/dt
    P.S:ignoring radiation trasfer.
    Qgen = 140 kw .
    mdot water=0.37m3/s.
    cpwater=4.1855 J/(g·K)
    C cast iron=0.46
    Initial conditions:
    at t=0sec Tengine = 45 Deg Twater entring = 30 deg c
    How can I design a radiator for such system , after solving the equation I still have 2 unknowns Thot air and T2 engine .
    From the above how can I identify the area of my heat exchanger ?
    Last edited: Jul 5, 2010
  2. jcsd
  3. Jul 5, 2010 #2
    Pleas I would like to know where I am wrong
  4. Jul 7, 2010 #3
    Nobody want to help me ?!
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