Passive HRV - pressure balance ..a few questions
I would need help or pointers to understand a few things about air in a tight home
and HRV/exhausts/ pressure balancing.
Situation is the following :
Planned to run a DIY central AC at first using some GEO + AC pump..i scrapped that
and will be installing mini splits for AC next year .
Heating is all handled by electrical underfloor heating ...
Still have the 4" PVC ducts going through the house that will be used with 4" fans
in the machine room to "mix" and redistribute air at a moderate level
( the house is faily large and hight, i want air to move around a little to be sure we get fresh air everywhere .. living part is 60' X 45' and almost 40' high )
We are using often ( my wife sells homemade food ) kitchen fans ( 2X 6" ~450cfm each )
and i had bought ( only isntalled 1 yet ) 2 panasonic whisper fans for both bathrooms
( both bath rooms have showers, only the one on the first floor is read and being used for now )
Then i bought a Venmar 3100 HRV back then, never got to install it yet
( still so many leaks..no need yet )
Ducting in my house is very hard, all ICF walls with granite stones, machine room is almost "remote" so i need to try and use what i've got unless absolutely necessary.
Was planning to send both bathroom exhausts on the rooftop " greenhouse".
Not to sure if i want to do this anymore..what do you think ?
using warm humid air to help heat the greenhouse during winter?
The house will be pretty tight when i'll be finished ( all ICF , and will do a PERSIST type walls on the roof exit room ..should be good numbers )
Should i be using the 3100HRV ? i don't mind not to use it,
i have many houses to build in the next few years and i'll be able to reuse it fairly easily.
Should i consider installing passive HRV on both bathroom outputs ?
The current HRV was going to be installed in the mechanical room, and fed in the redistribution system ... but then i won't be able to use it with any bathroom vents , will need to use only from the recirculation system.
Then what about pressure balance ?
When we turn on the 2 kitchen fans, it must depress the hole house ??
do the HRV automatically input some air to balance ?? what happends ?
also the performance of output fans must be very limited in tight house if not much input ??
Need to learn more about all this,
please do not point to central systems, i do not believe in those and will never use any,
but i'd like to read about HRV, bathroom exhaust, pressure balancing etc... as much as possible!
And please tell me what you think would be best for my house ?
BTW ...Zone 6-7 ( quebec )
thanks all for your time :)
Posted Jan 13, 2013 12:45 AM ET
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