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This one goes into the off-the-grid energy subseries.
The interesting thing here is that for 5 watts of fan power, he is able to divert warm air into an area for climate control. Now, the idea I have is to use warm water and a heat exchanger to heat the air to go into the "coffin" set up in my van.
I think a way to do that has already been covered. It involves wrapping a copper tube around and around, and that's your heat exchanger. You run the air across it an the water through it.
It would really be nice if chilled water can be run through it too, for climate control in the summer.
So, the new thing here is the use of the small fan.
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