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heat rejection rates

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PostPosted: Thu Nov 26, 2009 14:16    Post subject: heat rejection rates Reply with quote

Can anybody provide me with heat rejection rates for any of the water cooled V12 engines? Iím particularly interested in racing applications, but would also like to see data on these engines used in ďnormalĒ service.

Actual flow rates and delta T across the radiator would be best, but Iíll settle for BTU per minute if itís derived from hard data.

Thanks in advance!

Aaron Burhoe
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Joined: 15 Aug 2003
Posts: 134

PostPosted: Thu Apr 22, 2010 21:07    Post subject: Reply with quote

I read that specific heat rejection rates were in the 15 BTU/Min/BHP,
less than 10% of fuel energy to cooling. For some liquid cooled WWII aircraft engines. No specifics though, like power settings etc.

You see alot of information about liquid cooling offering more power because of greater heat rejection on the net. I would think the opposite.
That is the reason for cummins experimenting with its Adiabatic Diesel Engine in the 70's. Heat rejection means lost energy. Its best to use all the heat you can, and why the Turbocyclone was getting the excellent fuel consumption numbers it did.
Yes low heat rejection in a gasoline engine means more susceptibility to detonation, and thus loss of power, and possible failure.
The biggest advantage of liquid cooling is better control of the engine temperature. It is much more difficult to control cylinder and head temperatures in an aircooled engine, especially something like the Wasp Major. Sorry to get off topic.
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