I gotta ask, with water temps like you mention, are you in Corpus
Christi Bay?

MarshallE wrote:
My boat is a 1942 Wheeler 83 ft. long. She is one of the few remaining
cutters used in WWII and participated at Normandy.

I am thinking about using a high pressure residential air handler/evaporator
made by Unico. My goal is to run 2" PVC pipe for the duct wrapped with foam
rubber insulation.

I am hoping that there is a heat/cool transfer engineer that can help with
the research.

Marshall

"Glenn Ashmore" wrote in message
news:VDxEg.10485$ok5.2712@dukeread01...
Try Alaska Copper
http://www.alaskancopper.com/cuni/pd...ess_tubing.pdf They have
a
90/10 copper/nickel tube that is probably the best material for exposed
condensers.

You need to do a lot of research to roll your own A/C condenser. The tube
size and length is a compromise between pressure drop, heat transfer and
oil
movement. The surface area has to be sufficient to transfer enough heat.
If it is to long and small diameter the pressure drop will be to high. If
it is short and large diameter the refrigerant moves to slow so the oil
will
drop out and be trapped in the condenser which will starve the compressor
of
lubrication.

--
Glenn Ashmore

I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com

"MarshallE" wrote in message
...
Hi,

What is the normal metal tubing used for keel coolers and how long
should
it
last?

I am having a heck of a time locating a seawater condenser and have
about
decided to make from scratch.

I want to A/C using 5 tons for my boat.

thanks for help and opinions,

Marshall