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A Air conditioning can be supplied through forced air or a water-based chiller provides air conditioning. The A chiller circulates chilled water through a water distribution system to the cabins, to cool them in summer. All pipes should be insulated to prevent condensation. (Similarly, if you opt for forced air, the ducts should be insulated.)
This The spreadsheet calculator is adapted from Air Conditioning Your Home <ref>http://www.nrcan.gc.ca/energy/publications/efficiency/residential/air-conditioning/6051</ref>, published by the Energy Office of Natural Resources Canada (NRCAN) and available from its web site. It appears to fall within the general range of the other methods, based on area alone. Most rules of thumb are designed for single rooms, or two rooms joined. The author's calculator considers numerous more factors:
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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.
Calculating air conditioning is more complex than heating and so the answers are more varied. The next below table gives three sets of estimates to illustrate the issue.
Column A gives a series of BTU values derived from the buyenergyefficient.org web site <ref>http://buyenergyefficient.org/</ref>.
Except for the last two data points, methods A and C are in good agreement, but make your own judgement.
* Number of occupants