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Old 10-05-2009, 05:57 PM
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Cooling 1g of water from 25 C to 0 C takes 25 calories. Freezing 1g of water at 0 C takes 80 calories, a total of 105 calories.

1 Watt is 859 calories/hour, so at 100% efficiency, 1 Watt could freeze 8.1 grams of water per hour. Figure on a refrigerator being around 30-40% efficient, so say 2-3 grams.

Note that Watts are a unit of power - what you are looking for is watts-hours, which is a unit of energy.