It is known that on clear nights a thin layer of water

Chapter 12, Problem 12.142

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It is known that on clear nights a thin layer of water onthe ground will freeze before the air temperature dropsbelow 0C. Consider such a layer of water on a clearnight for which the effective sky temperature is?30Cand the convection heat transfer coefficient due to windmotion is h?25 W/m2?K. The water may be assumedto have an emissivity of 1.0 and to be insulated fromthe ground as far as conduction is concerned. Neglect-ing evaporation, determine the lowest temperature thatthe air can have without the water freezing. Accountingnow for the effect of evaporation, what is the lowesttemperature that the air can have without the waterfreezing? Assume the air to be dry.

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