Quote:
Originally posted by Les
Neat
Big Momma* no problem
Works with Alien Fudge Factor(0.0159722222222222222222222222222222)
Use Bill's http://forums.overclockers.com.au/sh...threadid=58005 to correct for 3/8" barb to 0.488"ID(Works with my sums).
Experimental Big Momma* ~ 1.1mH2O at 7.5LPM
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Hmm. I need to add something explaining 'one pass' vs 'two pass'. It looks like you setup the spreadsheet for Big Momma with only one pass. Because the water flows down one set of seven parallel tubes and up another set of six parallel tubes, the pressure drops for the two sets of tubes will be in series rather than parallel.
I think the flow resistance of the 3/8" barbs, swamps the resistance of the heatercore itself so much, that whether the heatercore were one pass or two would make a few percent difference in the total pressure drop of the two systems. (No time for a more in depth look right now.)
It does look like it would be reasonable to add a factor to the spreadsheet accounting for the ID's of barbs that have been added to the heatercore.
Quote:
Originally posted by Les
Tried a Wider HC( re Bills comment)
Radiator E* 30 Tubes(9/8"wide) 2 pass (0.4" ID entry) , (2 Pass ?)
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Radiator E is a single pass, but regardless, I would expect a substantially different set of fudge factors to be required to approximate the PQ behavior of Rad E. Too big a difference in the flat tubes. I think it would take data from a group of three rads, with flat tubes identical to Rad E's tubes, but different overall lengths and/or configurations. That gives you three equations using the three unknowns. (The fudge factors.)