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Old 06-30-2010, 12:54 PM   #1
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Help with operating pressures and flows in new residential system


I am an aerospace engineer and have some commercial HVAC experience but limited somewhat on residential. I am building a new system for an old house. I will runn 100% flex for the output and some flex for the returns as well.

1. is there a standard operating plentum pressure for residential systems to target?
2. Does anyone have any flow numbers for flex with a foil liner? I know this stuff is more restrictive than galv but I gotta use it on this install.
3. Is there a general rule of thumb for return sizing? ie, return flow = 120% of output?

My over all plan is to create an output plentum in the attic and add start collars as needed to run the 8 registers. Size has not been determined yet but units are 2.5T which is a shade big for the house but the house leaks and will be added on later...

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Old 07-01-2010, 07:56 AM   #2
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Help with operating pressures and flows in new residential system


Duct sizing is suppose to be based on system ASP, and TEL of the duct work.

Available Static Pressure.

Total Equivalent Length.

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