Question: (20%) Problem 2: A certain coal-fired power plant has a rated power capacity of P= 650 MW. The output of this plant is W=0.360

(20%) Problem 2: A certain coal-fired power plant has a rated power capacity of P= 650 MW. The output of this plant is W=0.360 where Oy is the energy input as heat from the hot reservoir. TH To W 14% Part (a) Write an equation for the efficiency of a heat engine in terms of QH and the heat Oc exhausted to a low temperature reservoir. =(0.36 QHQH)-Qcl 4 5 6 HOME - Grade Summary Deductions Potential Submissions 10% 90% Attempts remaining: detailed view (5% per attempt) 5% 5% ()789 a b d e f g h 1 23 1 k m P + - 0 END 2 Qc QH S t NO BACKSPACE DEL CLEAR Submit Hint Feedback I give up! Hints: 0% deduction per hint. Hints remaining: 2 Feedback: 0% deduction per feedback. =*14% Part (b) Which would increase the efficiency more, doubling Qy or reducing Qc by half? Reducing Q by half bring about the greater increase in efficiency. * Attempts Remain Feedback is available. 14% Part (c) Calculate the maximum thermal efficiency of the power plant. =0.3600 Correct! 14% Part (d) Calculate the absolute value of the exhausted heat (QC) each second in MJ for the power plant. X Attempts Remain Q=650.0 14% Part (e) If the power plant operates for a full day at its rated capacity, how much energy Q in MJ is needed? 14% Part (f) If, on average, one ton of coal contains Q-25 GJ of energy, how many tons ng of coal would the plant need to operate for a day at its rated capacity? 14% Part (g) How many tons no of this coal is exhausted as wasted heat to Qc in a single day?

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