4. An ice box contains 0.5 kg of ice at 0C. The outside air temperature is...

 

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4. An ice box contains 0.5 kg of ice at 0C. The outside air temperature is 20C. The latent heat of fusion of ice is 334 kJ/kg. The walls of the box comprise two layers of 1mm thick aluminium with a t a thermal conductivity of 237 W/mK, separated by a 3 mm vacuum layer with a thermal conductivity of 1 mW/mK. The box has dimensions 30 x 50 x 50 cm. a) How long will it take the ice to melt? b) If the vacuum seal breaches and the conductivity rises to 25 mW/mk, how long will it take? 4. An ice box contains 0.5 kg of ice at 0C. The outside air temperature is 20C. The latent heat of fusion of ice is 334 kJ/kg. The walls of the box comprise two layers of 1mm thick aluminium with a t a thermal conductivity of 237 W/mK, separated by a 3 mm vacuum layer with a thermal conductivity of 1 mW/mK. The box has dimensions 30 x 50 x 50 cm. a) How long will it take the ice to melt? b) If the vacuum seal breaches and the conductivity rises to 25 mW/mk, how long will it take?

Answer rating: 100% (QA)

To calculate the time it takes for the ice to melt in the icebox we need to consider the energy transfer through the layers of the box and the heat re... View the full answer