Question

1. Calculate the efficiency of a fossil-fuel power plant that consumes 360 metric tons of coal each hour to produce useful work at the rate of 740 MW. The heat of combustion of coal (the heat due to burning it) is 28 MJ/kg. (2 significant figures)

2. A heat pump is used to heat a building. The external temperature is lower than the internal temperature. The pump's coefficient of performance is 4.20, and the heat pump delivers 4.58 MJ as heat to the building each hour. If the heat pump is a Carnot engine working in reverse, at what rate must work be done to run it? (3 sig figs)

Answer 1

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