a steam power plant with a power output of 250 MW consumes coal at a rate of 60 tons/h. If the heating value of the coal is 30,000 kj/kg, determine the overall efficiency of this plant
By definition, the efficiency is the ratio of the production and consumption powers:
The production power is . The consumption power is:
where is the heating value of the coil, and is the rate of coil consumption. Thus, obtain;
Answer. 0.5.
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