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: (i) The rate of heat flow into the box (ii) The total heat flow in one day (iii) The mass of ice melted Take: Thermal conductivity of the box material to be 0.010 W / (m. K) Heat of fusion of ice to be Lf = 3.34 × 105 J/kg 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: (i) The rate of heat flow into the box (ii) The total heat flow in one day (iii) The mass of ice melted Take: Thermal conductivity of the box material to be 0.010 W / (m. K) Heat of fusion of ice to be Lf = 3.34 × 105 J/kg 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:
(i)
The rate of heat flow into the box
(ii)
The total heat flow in one day
(iii)
The mass of ice melted
Take:
Thermal conductivity of the box material to be 0.010 W / (m. K)
Heat of fusion of ice to be Lf = 3.34 × 105 J/kg
86,400 seconds are in a day.
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