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Question 7.2 An un-lagged furnace has a wall temperature of 500C and a surface area of 7 m. Calculate the heat loss by radiation

Question 7.2 An un-lagged furnace has a wall temperature of 500C and a surface area of 7 m. Calculate the heat loss by radiation to the surroundings which are at a constant temperature of 20C. You can assume that the furnace is a Grey body with emissivity of 0.75. The Stefan-Boltzmann constant has a value of 56.7 x 10 W.m.K. (104.09 kW)

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