A New Way to Duct HRVs revisited
I find Martin’s article A New Way to Duct HRVs pretty fascinating. It seems pretty sensible for a well sealed/insulated home, however the postscript from Dr. Straube says that 10cfm of conditioned air wouldn’t help with regulating the temperature in a closed off bedroom. I guess that makes sense at that rate.
My question is: what rate WOULD air have to be introduced to a closed bedroom to even out the temperature? 50cfm? 100cfm? I’m sure it depends on a few factors, but what’s a ballpark rate for a 150 sq ft bedroom in pretty good house?
I like what Martin envisioned: conditioned air from a single mini-split and fresh air from a cheap Panasonic HRV dumped into a living room, and then supplied to the bedrooms via short ducts. I would think a quiet Panasonic fan per room could push enough conditioned air into the bedrooms (return air accomplished with jump ducts) to keep the temperatures comfortable and the air fresh. These fans could even be operated with a bedroom door switch, ensuring that no extra power is used when the bedroom doors are open. Thoughts?
As always, thanks to GBA for all the quality information.
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