But more directly related to your post:
With upward sloping concentric tubes: wouldn't you think that most of the humidity of outgoing air condenses (and flows back outside of the HX) before it gets to the spot where it starts to freeze? So no need to think about the sport where it might start to freeze (as the amount freezing there would be quite small and melt away from time to time, say when outside air gets a bit warmer over the course of a day). I actually like your idea a lot, I would think that it almost entirely removes the need to think of freezing.
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