In article d99a4d77-d1a4-47b3-82f4-
, says...

On Sep 10, 5:38*am, Richard wrote:

What is the water temperature? It might be possible to simply use a
heat exchanger to dump heat into the water. In thory, it would even be
possible to get the coolant to circulate without a pump.

When it's 112 in the shade?
Water temp was about 87.

Is that water temperature at the surface? What is the water
temperature ten feet down?

Another approach might be to use a water bed. That 87 degree water is
about ten degrees cooler that your body and in a water bed without
foam insulation between you and the waterbed mattress will feel down
right chilly. Doing something like that could keep you comfortable
while you sleep and reduce the power needed in a 24 hour period.

The question that comes to my mind is "how big is the boat". A water
bed is a large almost-free surface and it could to really bad things to
stability.