Steam turbine engines are connected in pairs at a power plant so that the heat output of the first engine is used as the heat input of the second. The operating temperatures of the first engine are 676 °C and 424 °C and of the second, 414 °C and 286 °C. If the plant's target is to produce 1000 MW of power, estimate the rate in kg/s at which coal should be burned. Coal's heat of combustion is 2.8 x 107 J/kg. Assume the efficiency of the engines is 66.7 percent of the ideal (Carnot) efficiency. Begin by finding the efficiency of each engine. Your goal is to find Qh,1, the rate of heat input to the first engine. Use the facts that the total power supplied by the plant is the sum of the power supplied by each engine, that the heat input to the second engine equals the heat output of the first, and that the efficiency of each engine is the ratio of its work output to its heat input

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Steam turbine engines are connected in pairs
at a power plant so that the heat output of the
first engine is used as the heat input of the
second. The operating temperatures of the
first engine are 676 °C and 424 °C and of the
second, 414 °C and 286 °C. If the plant's target
is to produce 1000 MW of power, estimate the
rate in kg/s at which coal should be burned.
Coal's heat of combustion is 2.8 x 107 J/kg.
Assume the efficiency of the engines is 66.7
percent of the ideal (Carnot) efficiency.
Begin by finding the efficiency of each engine.
Your goal is to find Qh,1, the rate of heat input
to the first engine.
Use the facts that the total power supplied by
the plant is the sum of the power supplied by
each engine, that the heat input to the second
engine equals the heat output of the first, and
that the efficiency of each engine is the ratio
of its work output to its heat input.
please answer correct and asap i give thumbs
up promise
Transcribed Image Text:Steam turbine engines are connected in pairs at a power plant so that the heat output of the first engine is used as the heat input of the second. The operating temperatures of the first engine are 676 °C and 424 °C and of the second, 414 °C and 286 °C. If the plant's target is to produce 1000 MW of power, estimate the rate in kg/s at which coal should be burned. Coal's heat of combustion is 2.8 x 107 J/kg. Assume the efficiency of the engines is 66.7 percent of the ideal (Carnot) efficiency. Begin by finding the efficiency of each engine. Your goal is to find Qh,1, the rate of heat input to the first engine. Use the facts that the total power supplied by the plant is the sum of the power supplied by each engine, that the heat input to the second engine equals the heat output of the first, and that the efficiency of each engine is the ratio of its work output to its heat input. please answer correct and asap i give thumbs up promise
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