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Originally Posted by Les
Interesting.
What definition are you using for "C" in "C/W"? (LMTD, pseudo LMTD, MTD, or "in" TD)
Notwithstanding, data for the 120QP appears to suggest that the calculated ~5watt{~lpmxPa/6) of Frictional Heat(discussed here) at ~3.3gpm(12.5 lpm) may adequately explain the down-turn of the curves at low fannage.
Edit :Fixed link, ta Etacovda. |
Hi Les
"C", per
your preference, is the difference between the coolant inlet temp and the avg fan inlet air temp from 2 sensors 180° apart located in the center of the fan blade area 1/4" from the grille (all tested with grills in place)
to me the downturn at low fannage suggests something completely different, I don't believe the tube velocity is sufficient for appreciable heating