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→Air Conditioning
The heat exchanger can be water-air or water-water. A water-air exchanger would have to work against the heat in the engine room, so it makes more sense to use a water-water heat exchanger with a keel cooler as a heat sink. This is overall more efficient (the temperature differential is higher with water), and avoids generating extra heat in the engine room.
Additional cooling for one zone is provided by the Glacier Bay a cold-plate refrigeration system [8]. (A high-efficiency 12-VDC oldcold-plate design was chosen for the refrigeration to reduce AC loads, while not imposing a continuous DC load. Excess capacity may be used for air conditioning.)
Calculating air conditioning is more complex and so the answers are more varied. The next table gives three sets of estimates to illustrate the issue.