Thanks for taking my question.
I read this thread http://hvac-talk.com/vbb/showthread....ht=passive+HRV
and Carnak and others had a great discussion of passive HRVs.
However, in the end, I still feel like the case has not conclusively been made on passive HRVs.
I'm wondering if you can lay it out simply for me:
I am gutting my house in Winnipeg (6387*C or 11496.6*F HDD) and basically bringing it up to R-2000 standards. (R60 roof, R-24 walls via cellulose & XPS.)
What would be inferior about a passive HRV? My idea is to plumb it so the bathroom and other exhausts go to the HRV core and exhaust from the building. Then, incoming air passes through a motorized damper activated by a combination timer / humidistat and interlocked with the bathroom/exhaust fans and the furnace motor on low speed. Fresh air goes to the furnace supply air. Essentially, the house would only draw air in volume when the exhaust fan was on, but it could allow some air to come in if the exhaust fan was off.
Does this work? It seems this would eliminate the need for expensive extra ducting and extra motors, plus I can take advantage of the ECM motor in my furnace.
If required, We could put some motorized dampers to recirculate furnace air through the HRV if it frosts, but it seems that the Hoyme unit is not succeptible to frosting because it has large diameter tubes.
Here is a Nu-Air Passive HRV. Maybe it is a bit different than the Hoyme that was being discussed:
Nu-Air Passive HRV - NU120 and NU120-MD (Motorized Damper)
Hoyme HAE - Motorless Air Exchanger:
Thanks for your time,