9-134 An air-standard cycle with variable coefficients is executed in a closed system and is composed of the following four processes: 1-2 v = constant heat addition from 100 kPa and 27°C to 300 kPa 2-3 P = constant heat addition to 1027°C 3-4 Isentropic expansion to 100 kPa 4-1 P = constant heat rejection to initial state a) Show the cycle on P-v and T-s diagrams. b) Calculate the net work output per unit mass. c) Determine the thermal efficiency. | |
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