- Air is heated reversibly at a constant pressure of 1000 kPa until it has a specific volume of 0.8 m?/kg. It is then co
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- Air Is Heated Reversibly At A Constant Pressure Of 1000 Kpa Until It Has A Specific Volume Of 0 8 M Kg It Is Then Co 1 (81.27 KiB) Viewed 35 times
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you should not continue, leave it to someone is capable.
- Air is heated reversibly at a constant pressure of 1000 kPa until it has a specific volume of 0.8 m?/kg. It is then compressed reversibly according to a law, Py = constant, to a pressure of 4200 kPa, then allowed to expand reversibly according to a law, Pyl.3 = constant, and is finally heated at constant volume back to the initial conditions. The work done in the constant pressure process is – 555 J, and the mass of air present is 0.2 kg. You may assume constant specific heat: Cv = 0.834 kJ/kg.K, and k= 1.344. i) Sketch the cycle on a P-v diagram. (4 marks) ii) Calculate the work and heat transfer (with directions) at each stage of the cycle. (15 marks) [Total: 25 marks]
i) energy leaving system is negative (both work and heat transfer) Specific: (in kJ/kg) Total: (in kJ) Stage 1-2 2-3 3-4 4-1 u 8.72 0 -816.49 807.73 W q -2.775 11.50 1145.20-1145.20 -929.90 113.41 0 807.73 Stage 1-2 2-3 3-4 4-1 U 1.744 0.00 -163.30 161.55 W -0.555 229.04 -185.98 0.00 Q 2.299 -229.04 22.682 161.55