RE: How do you measure system airflow?

RE: How do you measure system airflow?

So much of what we do requires either measuring or approximating airflow measurement on the entire system (over the evaporator coil) what method or methods do you use?

If you absolutely had to get a system air measurement within 5% of reality on every call what method would you use?

BryanOrr Pretend Internet Professor Asked on March 3, 2018 in Residential HVAC.
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15 Answers

@Bryan not enough points to comment yet, but I do a timed traverse method, I have the quick reference sheet from trutechtools that has the position of the holes to drill based on duct dimensions.  Feel free to delete this since I can’t reply to your comment on my post, I did update the post to say that I use a timed-average traverse.

Junior Tech Answered on March 3, 2018.

Cool, I want to run a test at some point of a “true” traverse vs a simplified 3 point timed traverse from the front of the duct measuring one center and one on each side 2″ from the sides. I bet they aren’t much different in residential

on March 3, 2018.

@Bryan Orr, so I understand you correctly, you’re saying for comparison purposes, you would just skip the middle holes (when following the truetechtools guide)?  And check the center plus the two sides… I can test the difference I get on my duct system at home as I’ve already got results from the timed-traverse.

Secondly when you say “true” traverse do you mean the multi-point (I forget the number but like 25 points throughout the duct at certain intervals)?

I would tend to agree that in residential it doesn’t make much difference, but I’ve got my unit’s at home and the shop set-up that I could see what results I get.  

on March 4, 2018.
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