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- เผยแพร่เมื่อ 7 ธ.ค. 2022
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way to go that was a strong lesson. watched it a couple times and put new batteries in my anemometer. thanks Will
Starting an HVAC program in the fall and I want to get a head start. So helpful!!!
Thank you!
I've just but this thing, and it's not bad at all
can you just take the register grille off so i dont need to guess what the k factor is? if so would i measure the whole opening or would i measure just the air coming out of the round flex duct and get the sq inches of the duct only? thanks
Brother please keep the content comming!
Great video is there a residential flow hood?
Great explanation! Good job and thank you
Awesome video !
Glad you enjoyed it
Damn you just brought it back to Trade school with this one. Now i kinda. Im gonna dig out my notes. Thanx.
They taught ya'll that conversion in trade school?👏👏
Where did the .65 came from ?
🐐
That applies to 8 foot tall ceilings, right? Does it matter if a room has no windows or a lot of them with that 1 CFM per Square foot of floor space?
Just a rule of thumb to get the correct CFM. You will have to factor in ceiling height, windows, computers, vents etc.
@@WWHVAC Would be interesting to see what HVAC is supposed to be using for heat load criteria. I ask because it seems that they could simply throw in numbers to get the outcome they want vs. the formula.
@@Garth2011 Refer to the manual J (www.acca.org/standards/technical-manuals/manual-j ) but just about every major vendor has a load calculator contractors can use here are a few www.johnstonesupply.com/ac-load-calculator www.lennoxpros.com/load-calc www.loadcalc.net/load
Can you calculate this i have
450 fpm coming out of 12x12" Grill. ?
About 293 CFM
The cubic feet per minute (CFM) is determined by multiplying the air velocity (feet per minute or FPM), by the area of the duct in square feet.
First, to switch inches to feet for a 12x12" grill, you would:
12' (1 feet) * 12' (1 feet) = 1 square feet.
Then, you'd multiply how far over the grill the heated (or cooled) air is conveyed per minute (FPM) - across this one square foot of area, which in this case is 450 feet per minute.
Thus 450 FPM * 1 Square feet = 450 CFM.
Therefore, if you got an air flow of 450 FPM this would translate to 450 CFM for a 12x12" grill.
Assuming you have a K factor. like I used in this video.
If K factor (commonly known in HVAC systems as a measure of air flow through a system relative to duct size or a diminishing of air flow in certain conditions), is 0.65 for the cited route (gere the specification of supply grille at equalizing grid of the CAS Helix differential), make the CFM easier to calculate via multiplying a K The analogy mentioned, scales, the FPM specified from developing pressure impulses signatures together more discernably.
So, effectually:
450 CFM * 0.65 = 292.5 CFM
Where'd the 144 come from?
That's how you'll convert inches to feet
@@WWHVAC ohhh ok gotcha. That's right. I forgot some of the stuff they taught at school. Thank you
A 12” by 12” equals a square foot. 12x12=144
Where this dude getting all these random numbers like 144 and 28 and 65?
144 inches in a square foot, .65 is the restrictive value of the grille named by manufacture. the 28 is part of the k factor x the constant. the .28 is then multiplied by the 425 feet per minute fpm or velocity gives you your CFM
Wow! A lot of math!