Liquefied natural gas (LNG) is transported around the globe using ships similar to that shown in Figure QA3. This ship has four pressurised cylindrical steel tanks each of radius of 20 m. The tanks are internally insulated with 30 cm of polyurethane foam which keeps the LNG at a constant -162 ºC. Take the effective sky temperature is 265 K and the net radiative thermal energy exchange with the sky as 1x10^6 W. (a) Calculate the surface temperature of the end (facing the sun) of a tank. (b) Calculate the conductive heat transfer through the end (facing the sun) of a tank. DATA FOR QUESTION: Thermal conductivity, polyurethane foam = 0.02 W/mK Stefan’s Constant = 5.67x10^-8 W/m^2K^4 Emissivity, steel = 0.95
Liquefied natural gas (LNG) is transported around the globe using ships similar to that shown in Figure QA3. This ship has four pressurised cylindrical steel tanks each of radius of 20 m. The tanks are internally insulated with 30 cm of polyurethane foam which keeps the LNG at a constant -162 ºC. Take the effective sky temperature is 265 K and the net radiative thermal energy exchange with the sky as 1x10^6 W. (a) Calculate the surface temperature of the end (facing the sun) of a tank. (b) Calculate the conductive heat transfer through the end (facing the sun) of a tank. DATA FOR QUESTION: Thermal conductivity, polyurethane foam = 0.02 W/mK Stefan’s Constant = 5.67x10^-8 W/m^2K^4 Emissivity, steel = 0.95
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Question
Liquefied natural gas (LNG) is transported around the globe using ships similar to that
shown in Figure QA3. This ship has four pressurised cylindrical steel tanks each of
radius of 20 m. The tanks are internally insulated with 30 cm of polyurethane foam
which keeps the LNG at a constant -162 ºC. Take the effective sky temperature is 265
K and the net radiative thermal energy exchange with the sky as 1x10^6 W.
(a) Calculate the surface temperature of the end (facing the sun) of a tank.
(b) Calculate the conductive heat transfer through the end (facing the sun)
of a tank.
DATA FOR QUESTION:
Thermal conductivity, polyurethane foam = 0.02 W/mK
Stefan’s Constant = 5.67x10^-8 W/m^2K^4
Emissivity, steel = 0.95
answers:
a) 375K
b) 22.1kW
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