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4. A steam boiler is made of copper plate 7 mm thick. The inner surface is exposed to steam/water at 200ºC, and the outer surface to combustion gases at 350ºC. (a) calculate the rate of heat flow across 1 m2 of the boiler; (b) calculate the mass of water evaporated to steam per second, per square metre; If a layer of lime scale 0.5 mm thick, forms on the inside of the metal. (c) calculate the new heat flow rate per square metre and evaporation rate.(kcopper = 393 W/mK, klimescale = 1 W/mK)


4. A steam boiler is made of copper plate 7 mm thick. The inner surface is exposed to steam/water at 200ºC, and the outer surface to combustion gases at 350ºC. (a) calculate the rate of heat flow across 1 m2 of the boiler; (b) calculate the mass of water evaporated to steam per second, per square metre; If a layer of lime scale 0.5 mm thick, forms on the inside of the metal. (c) calculate the new heat flow rate per square metre and evaporation rate.(kcopper = 393 W/mK, klimescale = 1 W/mK)


Grade:upto college level

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