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Energy Analysis Of Closed Systems

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A 4 x 5 x 7 m room is heated by the radiator of a steam heating system. The steam radiator transfer heat at a rate of ....

Please show all work step by step and include all applicable formulas.

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Energy Analysis Of Closed Gas Systems

I need some help with this question:
A mass of 2.4kg of air at 150 kPa and 12 degrees C is contained in a gas-tight, frictionless piston-cylinder device. The air is now compressed to a final pressure of 600 kPa. During the process heat is transferred from the air such that the temperature inside the cylinder remains constant. Calculate the work input during this process.

Answer: 272 kJ.

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