At a steam power plant, steam engines work in pairs, the heat output of the first...

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Physics

At a steam power plant, steam engines work in pairs, the heatoutput of the first one being the approximate heat input of thesecond. The operating temperatures of the first are 770 âˆ˜C and 460âˆ˜C, and of the second 435 âˆ˜C and 280 âˆ˜C.
A) If the heat of combustion of coal is 2.8Ã—107J/kg, at whatrate must coal be burned if the plant is to put out 860 MW ofpower? Assume the efficiency of the engines is 65% of the ideal(Carnot) efficiency
B)Water is used to cool the power plant. If the watertemperature is allowed to increase by no more than 4.5âˆ˜C, estimatehow much water must pass through the plant per hour.

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3.6 Ratings (546 Votes)

a the coal rate Note that the sum of the work of each engine equals 860MW so W1 W2 860000 kW eq 1 thermal efficiency of heat engines is work output divided by heat input e WQa See Answer

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