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After enlarging the holding plate on my refrigeration system, we increased the capacity of our existing air-air heat exchanger by adding a raw water cooling loop and running the refrigerant through a separate heat exchanger. A small pump was added with a relay switch that turns it on whenever the compressor runs, but can be switched off if desired. Raw water is drawn by tapping into the existing galley sea water supply... no added through hull needed.
So far so good, but I need to test it for another summer. The pump increases the energy draw, but improves the heat exchange efficiency especially with high ambient air temperatures, so hopefully it’s a consumption wash. The larger holding plate does a much better job of chilling.
-Phil
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