(a) Calculate the heat flux through a sheet of brass 7.5 mm (0.30 in.) thick if the temperatures at the two faces are 150C and 50C (302F and 122F); assume steady-state heat flow. (b) What is the heat loss per hour if the area of the sheet is 0.5 m2 (5.4 ft2 )? (c) What is the heat loss per hour if sodalime glass is used instead of brass? (d) Calculate the heat loss per hour if brass is used and the thickness is increased to 15 mm (0.59 in.). 19

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