The plant engineer for a large foundry has been asked to calculate the thermal efficiency of the generating plant used by the company to produce electricity for the aluminum melting furnaces. The plant generates 545.6 GJ of electrical energy daily. The plant burns 50 t (tons) of coal a day. The heat of combustion of coal is about 6.2 × 106 J/kg (joules/kilogram). What was the answer? (Efficiency = W/Jheat)
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