Please Anwer all questions & Show Work Consider a gas turbine that has a pressur

Question

Please Anwer all questions & Show Work

Consider a gas turbine that has a pressure ratio of 6 and operates on the Brayton cycle with regeneration between the temperature limits of 20 degree C and 900 degree C. If the specific heat ratio of the working fluid is 13, the highest thermal efficiency this gas turbine can have is 38% 46% 62% 58% 97% Answer 62% A Carnot cycle operates between the temperatures limits of 300 K and 2000 K, and produces 600 kW of net power. The rate of entropy change of the working fluid during the heat addition process is 0 0.300 kW/K 0.353 kW/K 0.261 kW/K 2.0kW/K

Explanation / Answer

efficiency = 1 -(t2/t1)

                = 1 - (300/2000)=0.85

now efficiency = work done/ heat added

       0.85=600kW/heat added

therfore heat added = 705.88 kW

now entropy change s =Q rev / T

here during heat adition

T = 2000 k

therfore

rate of entropy change = 705.88kW/2000K = 0.353 kW/k

answer (C)

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