All rads were tested with fans pushing. Shrouds were not used other than on PA160 as requirement for fan mounting (as shrouds don't exist for PA120 series)
Doubt pulling over pushing would make any significant difference to the avg user.
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Originally Posted by Cathar
The differences between pull and push have always been very minor, ~2% or so by those who have actually measured in the instances where pull was found to be better.
For the PA rads I noticed that push was better, and again by a small margin, ~2%. We're not talking BIG differences here.
I suspect that the reasons for why are two-fold (or perhaps more-fold).
1) The air coming off the fan blades is fairly turbulent. This is perhaps helping out the more open-finned radiators slightly. Perhaps those who measured better performance in pull-mode were noticing that against more densely finned radiators where laminar flow is fairly quickly established once the air enters the fins (ignoring the effects of fin louvring here).
2) The Thermochill radiators have a better default fan stand-off distance from the core, and so the differences between shrouded and unshrouded are fairly small as noted, as well as perhaps evening the score between pull and push modes somewhat?
I'm just reporting what I saw. Again, the differences were not big, and it may be measurement error, but I saw the same phenomena repeated across the various PA prototype cores I have here. Go figure.
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