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Originally Posted by Incoherent
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Fine tune calculations to allow for heat shadowing and other non linearities. Model this.
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You shame me. I have conveniently forgotten to look at this
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Originally Posted by Incoherent
Feel for you Les. Know the feeling.............I am happy MCW6000 is not affected.
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Although area is OK was in grave doubts about Fin efficiency values.
Ditched modifying "Kryotherm to deal with pins" .
New Model
Use Flomerics to calculate "h(convection)"
Consider "Pin Free Area"(Apfa) and "Pin Area"(Apa) separately, use
Fin Efficiency(Fe) Calculator and calculate h(eff) --- h(eff)= (h(conv)*Apfa + Fe*h(conv)*Apa)/(Base Area)
Convert "h(effective)" to Rwb using
Waterloo
Convert Rwb to C/W(T in) using Kryotherm..
Attached predictions for the MCW6000 on 12x12mm and 10x10mm dies
Frightening coincidence with data.
Not sure whether am using correct dimensions for the MCW6000 :-
MCW6000 60x60x5mm bp,
281 (9x2x2mm) pins with 6mm(ID) inlet
Modeled as 60x60x5mm bp,
289(9x2x2)pins in17x17 array
Used Flomerics D=0.006, h=0.009,and r=0.02 to calculate "h(convection)" .
"r=0.02" chosen as value to give minimum Rwb value(beermat Iteration?) - See
"Pick & Mix". The problem is Waterloo only handles isoflux.
Edit: Attached an extract of Excel (Hope it opens)