Air changes per hour seems arbitrary to me.
We pay an Energy penalty for uncontolled and poorly controlled air change.
I believe that we should strive for Airtight construction.
Our buildings should have only "Intentional openings".
They should have dampereed intake valve(s) and dampered exhaust valve(s).
If the power goes out... then the valves should spring open.
That way at least our buildings are just as safe as conventional leaky builings.
Next, we should consider how much outside air we REALLY need and WHEN the outside air should be brought inside.
Arbitrary example: if a constant 60 cfm is desireable then must we really bring in 1 cubic foot every second?
How about 120 cfm for 30 minutes and not for 30 minutes?
How about 120 cfm for 12 hours and not for 12 hours?
Why not choose the best time(s) of day to bring the air inside depending on conditions outside and conditions inside?
We have the technology.
We pay an Energy penalty for uncontolled and poorly controlled air change.
I believe that we should strive for Airtight construction.
Our buildings should have only "Intentional openings".
They should have dampereed intake valve(s) and dampered exhaust valve(s).
If the power goes out... then the valves should spring open.
That way at least our buildings are just as safe as conventional leaky builings.
Next, we should consider how much outside air we REALLY need and WHEN the outside air should be brought inside.
Arbitrary example: if a constant 60 cfm is desireable then must we really bring in 1 cubic foot every second?
How about 120 cfm for 30 minutes and not for 30 minutes?
How about 120 cfm for 12 hours and not for 12 hours?
Why not choose the best time(s) of day to bring the air inside depending on conditions outside and conditions inside?
We have the technology.
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