DIY ventilation heat exchanger

[Ko_deZ]

Originally Posted by Drake

I have only found large commercial "wheel" ERV's in the US. Anyone know of a "residential" sizes one? Ko deZ what is the brand name? 93% of what? How can two passing air flows do more than reach equilibrium? The same with relative humidity of the air flows. Without a HP extracting it.

In the US, I have no idea. In Norway, Villavent are quite popular.
93% heat recovery. 0C outside, 20C inside gives me incoming air at approx 18.5C.
piwoslav got it right. Countercurrent flow. Check out heat exchanger in wikipedia, loads of good info there.