Mystery led heat transfer POWER LED
Mystery led heat transfer POWER LED
(OP)
hi everyone
i made a test, i assembled two different type LED (citizen/cree) on the same heat sink, the power of the LED is same (36W) but in the first case i got a temperature (TC) of 70 °c in the second case i got 90 °c....so what the reason of this gap?
how can control this behaviour during the cfd analysis?
thanks
i made a test, i assembled two different type LED (citizen/cree) on the same heat sink, the power of the LED is same (36W) but in the first case i got a temperature (TC) of 70 °c in the second case i got 90 °c....so what the reason of this gap?
how can control this behaviour during the cfd analysis?
thanks





RE: Mystery led heat transfer POWER LED
Why do you want a reason for the temperature difference? Do you think one result is wrong or that they should be less different (how much less)? I guess temperature in an LED depends strongly on the thermal resistance of it's internal parts, which might be different for each one.
RE: Mystery led heat transfer POWER LED
RE: Mystery led heat transfer POWER LED
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm
RE: Mystery led heat transfer POWER LED
RE: Mystery led heat transfer POWER LED
To model different thermal resistances, you could put an artificial resistive layer between the LED and the heatsink. Then tune that material's thermal conductivity to give the total thermal resistance you want. That's if you can't model the LED accurately with its actual material properties. Don't forget contact resistance of the interfaces between heatsink and LED, and any other contacting parts in the heat path. All these factors would affect the temperature of the part generating the heat.
RE: Mystery led heat transfer POWER LED
are you able to use siemens nx for cfd analisys?