Infiltration value for cooling load calculation
Infiltration value for cooling load calculation
(OP)
I am looking for a simple answer to a non-simple question.
My cooling load program requires an entry for CFM/SF for infiltration. Building in question is a corrugated steel siding, and visual inspection shows it to be not so tight.
0.1 CFM/SF, maybe higher?
Thanks
PacificSteve
My cooling load program requires an entry for CFM/SF for infiltration. Building in question is a corrugated steel siding, and visual inspection shows it to be not so tight.
0.1 CFM/SF, maybe higher?
Thanks
PacificSteve





RE: Infiltration value for cooling load calculation
Regards,
RE: Infiltration value for cooling load calculation
For heating, infiltration is considered because the air system providing the pressurization may be off. For office type building I typically use 1 cfm per linear feet of wall except I allow much more at doorways, entrances.
RE: Infiltration value for cooling load calculation
RE: Infiltration value for cooling load calculation
I use the chart below for a good starting point on infiltration:
COMMERCIAL BUILDINGS
RANGE 0-1.0 CFM/FT2
TIGHT BUILDING: 0.1 CFM/ FT2
AVERAGE BULDING: 0.3 CFM/ FT2
LEAKY BUILDING: 0.6 CFM/ FT2
RANGE 0-10 ACH
1.0 ACH – 1 EXTERIOR WALL
1.5 ACH – 2 EXTERIOR WALLS
2.0 ACH – 3, 4 EXTERIOR WALLS
3.0 ACH - VESTIBULE
You can use either cfm/ft2 or air changes per hour (ACH) which ever you prefer.