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Air change rate - fresh air flow rates


daz1984

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Hi all, 

 

Trying to calculate the air change rate, the basic formula I've found on google specifically asks for fresh air flow rate. Is there any assumptions made with this figure? I'm not even sure where to start on calculating an accurate figure. We do have a log burner in the lounge so I assume this would maybe cause some fresh air flow? Bathroom fans? But in terms of quantifying a figure I'm at a loss.

 

For some context I'm trying to calculate what size, roughly, ASHP I would require - i appreciate this has been covered many times. I've found a spreadsheet on here so i'm trying to work through that for predicted heat loss.

 

Apologies if this has been covered elsewhere, maybe I'm searching inaccurately.

 

Cheers

Daz

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