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Q6. A fruit juice carrier has 2 spherical tanks each of radius 12 m. They contain liquid at a temperature of 3°C. The tanks are insulated with 600 mm thickness material of fibre glass with a thermal conductivity of 0.04 W /mK.

The outside surface heat transfer coefficient is 2 W /m²K and the outside air temperature is 30°c.

Calculate EACH of the following:

(a) the total rate of heat lost;

(b) the external surface temperature;

(c) the total percentage mass evaporated each 28 days.

Note: Density= 1250 kg/m³ Latent heat of evaporation is 2700 kJ/kg.