a) Explanation Write the expression for the entropy change of helium. s 2 − s 1 = c p ln T 2 T 1 − R ln P 2 P 1 (I) Here, final and initial specific entropy is s 2 and s 1 respectively, initial and final temperature is T 1 and T 2 respectively, universal gas constant of air is R , and initial and final pressure is P 1 and P 2 respectively. Write the expression for the maximum reversible work. w rev,out = c p ( T 1 − T 2 ) − T 0 ( s 1 − s 2 ) (II) Conclusion: Refer to Table A-1, “Molar mass, gas constant, and critical-point properties”, obtain the following properties for the helium. c P = 5.1926 kJ / kg ⋅ K R = 2.0769 kJ / kg ⋅ K Here, specific heat of the helium is c P and gas constant of the helium is R . Substitute 5.1926 kJ / kg ⋅ K for c P , 25 ° C for T 2 , 300 ° C for T 1 , 2.0769 kJ / kg ⋅ K for R , 100 kPa for P 2 , and 1500 kPa for P 1 in equation (I). s 2 − s 1 = ( 5.1926 kJ / kg ⋅ K ) ln 25 ° C 300 ° C − ( 2.0769 kJ / kg ⋅ K ) ln 100 kPa 1500 kPa = ( 5 b) To determine Type of turbine required to achieve the maximum work.

8th Edition

ISBN: 9780100257054

Author: CENGEL

Publisher: YUZU

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Chapter 8.8, Problem 50P

To determine

The maximum reversible work produced by the turbine

To determine

Type of turbine required to achieve the maximum work.

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Chapter 8.8, Problem 48P

Chapter 8.8, Problem 51P

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