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A carnot engine having a perfect gas aas...

A carnot engine having a perfect gas aas the working substance is driven backwards and is used for freezing water already at `0^(@)C`. If the engine is driven by `500W` electric motor with an efficiency of `60%` how long will it take to freeze `15kg` of water? The working temps of the engine are `15^(@)C` and `0^(@)C`. The system involves no energy losses. Given latent heat of ice `=333xx10^(3)J kg^(-1)`.

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A refrigerator is driven by 1000 W electric motor having an efficiency of 60% . The refrigerator is considerd as a reversible heat engine operating between 273K and 303K . Calculate the time required by it to freeze 32.5 kg of water at 0^(@)C . Heat losses may be rejected. Latent heat of fusion of ice = 336xx10^(3)J kg^(-1) .

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