I'm looking for something similar. What I think I'm going to do is a kind of reverse 'pop can solar heater'. I'm going to build tubes out of pop cans and run them through a box. Air from the dryer vent will be pumped into the box on one end and then out the other, heating the air in the pop can tubes. I'll have a fan on the outside of the box blowing air thru the pop can tubes, effectively siphoning off the heated air.
It will require a drain for the condensation that collects, but that can be drained periodically. Sorry, no drawings at the moment!
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