HOW MANY "CFM'S" I NEED TO OCTAIN A AIR FLOW OF 30

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HOW MANY "CFM'S" I NEED TO OCTAIN A AIR FLOW OF 30

Postby AXEL VAZQUEZ » Wed Apr 20, 2005 9:09 pm

HOW MANY "CFM'S" I NEED TO OCTAIN AN AIR FLOW OF 30 MILES PER HOUR IN A (6' WIDE BY 8' HIGH BY 16' LONG CHAMBER) ?
AXEL VAZQUEZ
 

Re: HOW MANY "CFM'S" I NEED TO OCTAIN A AIR FLOW O

Postby Guest » Wed Apr 20, 2005 10:30 pm

AXEL VAZQUEZ wrote:HOW MANY "CFM'S" I NEED TO OCTAIN AN AIR FLOW OF 30 MILES PER HOUR IN A (6' WIDE BY 8' HIGH BY 16' LONG CHAMBER) ?


You don't specify in which direction. I will assume flow is in the 16' direction so the cross section of the flow is 6' x 8' = 48 sq ft.

30 mph x 22 fps/15 mph = 44 ft/sec.

44 ft/sec across 48 sq ft = 2112 cubic feet per minute. This ignores the fact there will be slight stagnation at the walls, causing a higher velocity in the center and lower velocity around the edge.

You are talking serious fans plus straightening louvers to create this.
Guest
 

Re: HOW MANY "CFM'S" I NEED TO OCTAIN A AIR FLOW O

Postby Guest » Wed Apr 20, 2005 10:53 pm

Anonymous wrote:
AXEL VAZQUEZ wrote:30 mph x 22 fps/15 mph = 44 ft/sec.

44 ft/sec across 48 sq ft = 2112 cubic feet per minute.


Big Oops:
44 ft/sec across 48 sq ft = 2112 cubic feet per SECOND!!!
That's 126.720 cubic feet per minute, sorry about that.
Guest
 

Re: HOW MANY "CFM'S" I NEED TO OCTAIN A AIR FLOW O

Postby dinhj2002 » Fri Jun 17, 2005 7:47 pm

Anonymous wrote:
Anonymous wrote:
AXEL VAZQUEZ wrote:30 mph x 22 fps/15 mph = 44 ft/sec.

44 ft/sec across 48 sq ft = 2112 cubic feet per minute.


Big Oops:
44 ft/sec across 48 sq ft = 2112 cubic feet per SECOND!!!
That's 126.720 cubic feet per minute, sorry about that.



Hi Guest !

Could you explain little bit in detail how/where do you get 22fps/15mph from? I am kind of confuse at this step. Thanks
dinhj2002
 

Postby Guest » Fri Jun 17, 2005 7:52 pm

If you convert x miles per hour to feet per sec, you have

x mph * 5280 ft/1 mi * 1 hr/3600 s = 5280x/3600 ft/sec

Any such conversion involves the fraction 5280/3600, which simplifies to 22/15 if you remove common factors. It is exact.
Guest
 


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