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jesus3426
jesus3426
14.09.2019 • 
Engineering

Avertical piston-cylinder device initially contains 0.1 m3 of air at 400 k and 100 kpa. at this initial condition, the piston is resting on a stop. the piston-cylinder device is connected to a supply line with air at 400 k and a pressure of 500 kpa. the valve between the supply line and the piston-cylinder device is opened and is left open until the pressure in the piston-cylinder device reaches 500 kpa. the piston is observed to start moving when the pressure in the cylinder is 200 kpa and the piston continues to rise until it reaches a second stop. at the second stop, the piston-cylinder volume is 0.2 m3 . the final temperature and pressure in the piston-cylinder device are 440 k and 500 kpa, respectively. molecular weight of air = 28.97 kg/kmol. determine heat transfer (kj) during the entire process. indicate whether it is into the system or out of the system.

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