Heat transfer question. Solution is 101W how I get there?

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Heat transfer question. Solution is 101W how I get there?



An electric kettle can be modelled as a plastic cylinder 0.15m in diameter and 0.2m high. The plastic can be taken as being 2mm thick with a thermal conductivity of 1W/mK. Calculate the heat loss from the kettle when the water is at 100°C and the surrounding air is at 20°C. The heat transfer coefficient on the water-side can be taken as 3000 W/m^2.K and on the air side as 10 W/m^2.K?



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