Yep, look at all the radiators... aren't they mostly black? And a thin
coat of paint would seem to offer very little int he way of heat
transfer resistance. Sean, you out there? How about doing a quick and
dirty analysis of a painted aluminum surface vs an unpainted one? I'll
look to see if I can find the applicable properties of paint for thermal
emissivity (sp?). Black bodies do radiate better than polished ones.
Rough is better than polished because of the increased surface area as
was mentioned.
mayf
Steve Laifman wrote:
> Right on, Mayf,
>
> I am reminded of the Jaguar XK 120M at a Palm Springs race day
> Concour. It had the top brass tank stripped, and polished. Maybe a
> clear coat as well. Looked great, but the Jag cooling system is
> marginal at best, and it would overheat rapidly. The original black
> coloring was for heat radiative emission, and that was destroyed.
>
> "It's the heat, not the humidity" :-)
>
> Steve
>
> ___
> Steve Laifman
> Editor - TigersUnited.com
>
>
>
> drmayf wrote:
>
>> <----- snip ------>
>> All three are needed. Of course, when the horsepower is increased
>> beyond that which the radiator can recover then the motor will run hot.
>> The radiator, via the thermostat is the controller of the heat in the
>> engine. Take for example an engine run in very cold climates... they
>> will hardly warm up because of the heat being carried away via
>> convection and radiation. Needless to say, the system needs to be well
>> designed to do the job at hand.
>>
>> mayf
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