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-   -   Help with operating pressures and flows in new residential system (http://www.diychatroom.com/f17/help-operating-pressures-flows-new-residential-system-75062/)

viper 06-30-2010 11:54 AM

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...

beenthere 07-01-2010 06:56 AM

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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