I just got my hands on about 8 cubic feet of coroplast for free through Craigslist. I wonder how big the heat exchanger needs to get before diminishing returns just make it ridiculous? IIRC that Danish paper had one about 3x2x.5 feet and it was 80-something% efficient. I'm not sure I'll get around to doing anything with my coroplast soon but I'll try to come back to this thread whenever I start working on it.
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