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No heat (energy) is required to freeze water (from liquid to solid). Freezing RELEASES energy (heat), as it is an exothermic event. If you want to know how much energy is release, you need to know the heat of fusion for water, and then multiply that by the mass of water being frozen.

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Q: If 30.86g of H2O is frozen (from liquid to solid) how much heat energy is required?
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