Slant Fin heatloss program

Dave_22

When you enter the "door and glass" square footage-doesn't this count infiltration? When I add the real infiltration factor, it doubles the heatload. It's greater than the heat output in my living room which currently has kept up in all whether conditions. It just seems to me that it raises the load higher than what I think it really is. Any thoughts on this??

Dave_22

Infiltration factor

When you enter the "door and glass" square footage-doesn't this count infiltration? When I add the real infiltration factor, it doubles the heatload. It's greater than the heat output in my living room which currently has kept up in all whether conditions. It just seems to me that it raises the load higher than what I think it really is. Any thoughts on this??

Ted_9

Give us examples of the numbers your entering and what they represent.

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Uni R

Infiltration factor

They are different things. Infiltration is a measure of how easily outside air influences the inside space heating requirements. Better windows and doors can at times be completely tight and likewise poor performing walls can be full of holes.

Constantin

Infiltration is a hard-to-estimate variable...

... it depends on the construction techniques used in your home, how diligent the sealing folk were, what kind of insulation you chose, etc. In other words, until you do a blower-door test, you won't know how much air your house does or does not admit for a given ΔP on the outside.

Infiltration can be one of the biggest factors affecting the heat loss/gain of your home. In our case, HVAC-Calc assumed it to be 1/5 of the total heat loss, based "best" construction practices. It will be interesting to note what the actual infiltration rates are because I have the feeling that foam-filled walls will surpass "best" infiltration rates by a long shot. The only remaining issues then are the windows and doors, a necessary evil in most homes. :-)

EBEBRATT-Ed

The square footage factor for doors and windows is calculating the heat loss per square foot of door and window area. Infiltration is for calculating the leakage around the permiter of the doors and windows. The tighter the windows and doors fit (weatherstripping etc) the less infiltration


Ed