Thomas Prufer wrote:
On 29 Jan 2018 01:38:26 +0000 (GMT), Theo
wrote:

If he can heat exchange into the river, then he might be onto something.
Though the fish probably won't like him for that.

Actually, this will not heat the water: the power comes from the micro hydro, is
extracted, (slowing the river), and via various lossy generators etc., returned
to the river water as heat.

Wouldn't this energy have ended up as heat in the river water anyway?

Likely. But if you're watercooling GPUs through traditional watercoolers
then it'll come out a lot hotter than river water. So it depends how much
water you can use to cool, and how you mix it with the rest of the river.
If you squirt hot water into the river it'll harm the wildlife in the
vicinity, even if it'll cool down as it mixes downstream.

Theo