a) Explanation Draw the T − s diagram for ideal steady-flow Ericsson engine as shown in Figure (1). Write the expression to calculate the entropy change during the process 3-4. s 4 − s 3 = − − q o u t , 34 T 0 (I) Here, heat output during the process 3-4 is q o u t , 34 and surrounding temperature is T 0 . Write the expression to calculate the maximum pressure at state 4. s 4 − s 3 = c p ln T 4 T 3 − R ln P 4 P 3 Here, in process 3-4 temperature T 4 and T 3 are equal. s 4 − s 3 = c p ln T 4 T 3 ↵ 0 − R ln P 4 P 3 = − R ln P 4 P 3 (II) Here, temperature at state 4 is T 4 , temperature at state 3 is T 3 , pressure at state 3 is P 3 , pressure at state 4 is P 4 , gas constant is R and the specific heat of air at constant pressure is c p . Conclusion: From Table A-1, “Molar mass, gas constant, and critical2point properties”, obtain the value of gas constant ( R ) for air as 0 b) To determine The net work output per unit mass of air. c) To determine The thermal efficiency of the cycle

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Author: CENGEL

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Chapter 9.12, Problem 77P

To determine

The maximum pressure in the cycle.

To determine

The net work output per unit mass of air.

To determine

The thermal efficiency of the cycle

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Chapter 9.12, Problem 76P

Chapter 9.12, Problem 78P

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The maximum pressure in the cycle.

Solution Summary: The author explains the maximum pressure in the cycle and the entropy change during the process 3-4.

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The maximum pressure in the cycle.

The net work output per unit mass of air.

The thermal efficiency of the cycle

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Chapter 9 Solutions