Academics – Applied Heat : 2021/DEC/06
Question
Q6) An LNG carrier has five spherical tanks each of diameter 36m. They contain liquefied gas at a temperature of -163℃. The tanks are insulated with 60 cm thickness of material of fibre glass with a thermal conductivity of 0.04 W/mK
The outside surface heat transfer coefficient is 8 W/(m2 k) and the outside air temperature is 29℃.
(a) Calculate the total rate of heat gain. (7)
(b) Find the external surface temperature. (4)
(c) Calculate the total percentage mass evaporated each day. (5)
NOTE: r = 1000 kg/m3 Latent heat of evaporation is 515 kJ/kg
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