On 9/10/2011 12:25 PM, pyotr filipivich wrote:
on Sat, 10 Sep 2011 04:38:19 -0500
typed in rec.crafts.metalworking the following:
On 9/10/2011 4:10 AM, Robert Roland wrote:
On Sat, 10 Sep 2011 01:24:45 -0500,
wrote:

I'm trying to cool the boat for a few days at a time...

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.

That's a 25 degree (F) [13 C] differential. Remember, heat pumps
"move" the heat from one area to another. In essence, a heat pump
would be trying to "heat all outdoors" - or the entire lake, as the
case may be.

One calorie per gram (of water) per degree - it is going to take a
lot of calories out of your boat to raise the temp of the lake from
48C to 49C. That is what you have to work with.



Ah yes, the global-warming types would have a fit - and I'd have to
wear a heavy coat (at least!).