Hello all!
Earlier this year I installed an
Isotherm air-cooled holding plate system in my
icebox. I plan on using the
boat for weekend trips every now and then, and thought it would be nice to have some sort of built in
refrigeration when doing it.
The
compressor I mounted under the quarterberth just aft, in a large-ish space with admittedly poor ventilation. It worked okay for a while, though the box never really got as cold as I would have liked (the holding plate never really frosted over, even when I left the unit running on max for 24h+). It didn't seem to be a problem with ventilation, the
compressor space never heated up very much. The box is ~4 cubic feet and the old system was sized for a bit larger, but that might have been generous given the 36 year old
insulation behind my
icebox.
Anyways, it quit working recently. I left it run all night recently and when I came back the next day the plate was still room temperature. The compressor didn't sound any different so I'm wondering if the system
lost its
coolant (r134a) somehow.
When I picked this system, I opted against water-cooling due to the increased complexity. I'm reconsidering that now, especially because I feel it would be much more efficient with the cold
water here in
San Francisco Bay. Here's the
draft plan:
Intake: The compressor mounts near the thru-hull for the
engine raw water intake. I'm thinking I can tee off of that. Actually, I'd tee after the
engine strainer and include a check valve to prevent the engine pulling
water through the compressor when it's on. I would have to make sure the fridge is not turned on without the thru-hull being open - which does worry me a little if I decide to leave it running when not aboard.
Output: Run a hose from the compressor aft to a small thru-hull high up in the transom, with another check valve to prevent backflow in a following sea.
Alternative: Another idea was to add
plumbing to my freshwater tank and use that water for heat exchange instead of
raw water. It'd be a lot of extra hoses and the freshwater isn't as cold as seawater, but it might
work?
Think this is worth doing?