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Keeping temperatures on the ground in the "black"?

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tonyrenshaw268(at)gmail.c
Guest

Posted: Mon Jul 28, 2014 6:30 pm Post subject: Keeping temperatures on the ground in the "black"?

Leafblower??

TR



On 29 Jul 2014, at 9:05 am, rparigoris <rparigor(at)suffolk.lib.ny.us> wrote:



 	  Quote: 	
		   

 

 Hi Group

 

 Has anyone tried to paint Europa radiator (and or inter-cooler) flat black using a leaf blower?:

 

 https://www.youtube.com/watch?v=f1QL9veQaNg

 

 Any help on the ground with cooling of my 914 mono and will be most welcome.

 

 Ron Parigoris

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=427476#427476

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rparigoris

Joined: 24 Nov 2009
Posts: 796

Posted: Mon Jul 28, 2014 9:18 pm Post subject: Keeping temperatures on the ground in the "black"?

Hi Tony 

 	He used a leaf blower to blow the paint into the radiator fins. Watch the video. 

 	Ron Parigoris    [quote][b]

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rob(at)hyperion-ef.com
Guest

Posted: Tue Jul 29, 2014 9:34 am Post subject: Keeping temperatures on the ground in the "black"?

I don't care what these clowns "proved" in that video, it is not supported by the science of heat transfer - at the rather low temperatures encountered in an air to air intercooler the dominant modes of heat transfer are convection and conduction, neither of which is affected in the least by the color of the heat exchanger. At much higher temperatures, say 400°C and hotter, then radiation starts to contribute a bit more to heat transfer compared to convection or conduction. Google “Stefan-Boltzmann” to learn a bit about radiative heat transfer. 

 

Painting the surfaces of the heat exchanged will actually impede heat transfer because the paint is less conductive than the aluminum or copper usually used for this sort of heat exchanger. The thickness of the paint will also slightly reduce the area left for air flow thus further degrading the efficiency of the heat exchanger.

 

“Paint it Black” worked pretty well for the Stones but it won’t for intercoolers.

 

 

Best regards,

 

Rob Housman

Irvine,  California

Europa XS

Rotax 914

S/N A070

Airframe complete

Avionics in progress

 

 

 

--

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