Interesting. In 1988, I designed a homemade HRV. I used aluminum flashing as the heat exchange medium, and I use plastic lumber to space the plates apart. (Or at least it was the only form of plastic lumber I could find in 1988.)
You can get my “recipe” for the HRV at a website, which also has links to related energy conservation data for houses: The links and narratives are on the top half of the web page. The actual PDF and Word documents are on the bottom half of the web page, which have the HRV diagrams and text.
This forum would not let me post the actual link.
So, if you go to google, and use these search words: homemade hrv Meinert
You should be able to access the google groups webpage with this information. (When I used these search words, the link was about 6 entries down on the displayed page)
The HRV which I made recovered about 70% of the heat from the exhaust air, which made the incoming air a fairly pleasant temperature, even in the dead of winter.
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