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Q6. An LNG carrier has 3 spherical tanks each of diameter 50 m. They contain liquefied gas at a temperature of -163°C. The tanks are insulated with 60 mm thickness of material of fibreglass with a thermal conductivity of 0.02 W/mK.

The outside surface heat transfer coefficient is 4 W/m²K and the outside air temperature is 18°C.

Each tank contains a liquid volume of 60000 m³.

(a) Calculate the total rate of heat lost.

(b) Find the external surface temperature.

(c) Calculate the total percentage mass evaporated each day.

Note: p = 1000 kg/m³ Latent heat of evaporation is 515 kJ/kg.