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Engineering · Mechanical Engineering
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The base of a room has concrete slab 5m long, 3m wide and 0.35m thick. During the winter, temperatures are nominally 19 °C and 7°C at the top and bottom surfaces, respectively 19°C 0.3 m 7°C (a) Assuming heat is transferred by conduction only, and the concrete has a thermal conductivity of 1.4 W/mK, what is the rate of heat loss through the slab. 6 marks] (b) If the basement is heated by an electrical resistance heater operating at an efficiency of 0.90 and electrical energy is priced at £0.01/MJ, what is the daily cost of the heat loss through the concrete slab.

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