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 .(adsbygoogle = window.adsbygoogle || []).push({});

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

Rho=7870KG/m3.

v=>volume=0.01m3.

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 ?

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# Transient heat transfer in heat exchangers

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