calc Tr of aluminum object? - Electronic Circuits Projects Diagrams Free

justDIY · 9th January 2008, 05:04 AM

Is there a way to calculate the thermal resistance of an aluminum object?

I have these cool bowls made from cast aluminum. they're about 1/8" thick material, and about 4" square and 1.5" deep.

i'd like to just get a rough ballpark to see if further testing is feasable (which may otherwise deface the bowl) or if it's a non starter

here's the object in question

http://projects.dimension-x.net/pict...wl/topdown.jpg

stevez · 9th January 2008, 01:13 PM

It is possible to estimate the thermal performance - estimate suggests a level of inaccuracy. It's also possible to more accurately calculate the thermal performance. The "estimate" takes some work - the calculation quite a bit more and/or some fairly expensive software.

It might be simpler to experiment to see how it performs. How much effort should be applied is likely determined by your specific needs.

justDIY · 9th January 2008, 08:40 PM

the object in the bowl is a 9 watt rgb star, so thats how much heat I'm dealing with. Junction temp not to exceed 85C. Lumileds claims I need a Tr of 11 ... but my math says 7.

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9th January 2008, 05:04 AM	(permalink)
justDIY	calc Tr of aluminum object? Is there a way to calculate the thermal resistance of an aluminum object? I have these cool bowls made from cast aluminum. they're about 1/8" thick material, and about 4" square and 1.5" deep. i'd like to just get a rough ballpark to see if further testing is feasable (which may otherwise deface the bowl) or if it's a non starter here's the object in question http://projects.dimension-x.net/pict...wl/topdown.jpg __________________ If you don't have a planet, what good are gold bars? want to contact me directly? gmail gordonthree check out my project website: http://projects.dimension-x.net Favorite numbers: 09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0

9th January 2008, 01:13 PM	(permalink)
stevez	It is possible to estimate the thermal performance - estimate suggests a level of inaccuracy. It's also possible to more accurately calculate the thermal performance. The "estimate" takes some work - the calculation quite a bit more and/or some fairly expensive software. It might be simpler to experiment to see how it performs. How much effort should be applied is likely determined by your specific needs. __________________ stevez

9th January 2008, 08:40 PM	(permalink)
justDIY	the object in the bowl is a 9 watt rgb star, so thats how much heat I'm dealing with. Junction temp not to exceed 85C. Lumileds claims I need a Tr of 11 ... but my math says 7. __________________ If you don't have a planet, what good are gold bars? want to contact me directly? gmail gordonthree check out my project website: http://projects.dimension-x.net Favorite numbers: 09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0