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Originally Posted by Cathar
Hmmm, we see the curves from your testing that the C/W remains relatively fixed across broad heat-load differences...
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Have not seen any such curves or indications for radiators.
Only curves are where (Twi-Tai)* is fixed and actual parameters(Q,Twi,Two,Tai and Tao) involved in the rate-equation* are allowed to float(in accordance with the laws of physics). All that is being indicated is that W is behaving like Q(except at high coolant flow where dP*Flow(water) correction becomes significant and has to applied to W) and obeying the Laws of Physics. Gives no indication of the "C/W" [(Twi-Tai)/W] variation with Q.
For wbs on dies, Bill's early work(e.g
this does include indications but shows no definitive curves. Here (Tdie-Twi)* change with Q(I understand to be heater wattage(super-insulated and heat-loss-to-ambient adjusted) is measured..These data (would prefer using data as collective noun but...Rome....) suggest measured Q is behaving like the rate-equation's Q***. Additionally since (Twi-Two) is correctly predicted(as shown
here) it suggests to me that C/W((Tdie-Twi)/C) is behaving similarly to U. Further data sets (like
these) may possibly reveal that this only approximate.
* (Twi-Tai)=C and (Tdie-Twi)=C in C/W
** Q=UA((Twi -Tao) - (Two - Tao))/ln(Twi -Tao)/(Two -Tai)
*** Q=UA(Two -Twi)/lin((Tdie - Twi)/(Tdie-Two))