Quote:
Originally Posted by Zwerius
...I have a house that's CO2-neutral (including the electric car BMW i3)...
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Congratulations on CO2 neutrality!!!
You have achieved a goal that most of us haven't even allowed ourselves to dream of... and you have done it, very nice.
Quote:
Originally Posted by Zwerius
If your house was built in 1987, and had a cross-flow HRV, you really are ahead of the game.
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But as you surely know, a lot of improvement has happened since then, with ECM fans and improved HX cores, etc. I would check into what kind of HRVs are being used for Passive Houses. They seem to be at the cutting edge of this kind of thing.
Quote:
Originally Posted by Zwerius
Just curious about the measured flows. Anyone?
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Good point!
I did some experimental work that was posted on the DIY HRV thread, and Mike, the guy I was working with, happened to have a precision air volumetric measuring meter. They're really expensive and he was pretty lucky to have found one used, in good condition, and cheap.
In the DIY HRV thread also, there is a procedure described that uses very large plastic bags, and their volume is estimated and the time-to-fill is measured. I know it sounds very crude, but it should give you a good approximation of air volume rate.
-AC