4. A box with total wall area of 0.6m² and wall thickness 3cm is used to cool drinks. The inner and outer surface of the box are 0°C and 50°C respectively. Determine: (1) The rate of heat flow into the box (ii) The total heat flow in one day (ii) The mass of ice melted Take: Thermal conductivity of the box material to be 0.010 W /(m. K) leat of fusion of ice to be Lf = 3.34 × 105 J/kg %3D 86,400 seconds are in a day.
4. A box with total wall area of 0.6m² and wall thickness 3cm is used to cool drinks. The inner and outer surface of the box are 0°C and 50°C respectively. Determine: (1) The rate of heat flow into the box (ii) The total heat flow in one day (ii) The mass of ice melted Take: Thermal conductivity of the box material to be 0.010 W /(m. K) leat of fusion of ice to be Lf = 3.34 × 105 J/kg %3D 86,400 seconds are in a day.
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Transcribed Image Text:4. A box with total wall area of 0.6m² and wall thickness 3cm is used to cool drinks. The inner
and outer surface of the box are 0°C and 50°C respectively. Determine:
(1)
The rate of heat flow into the box
(ii)
The total heat flow in one day
(ii)
The mass of ice melted
Take:
Thermal conductivity of the box material to be 0.010 W /(m. K)
leat of fusion of ice to be Lf = 3.34 × 105 J/kg
%3D
86,400 seconds are in a day.
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