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Oxygen is contained in a piston-cylinder system initially at a temperature of 40 oC and a...

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Mechanical Engineering

Oxygen is contained in a piston-cylinder system initially at atemperature of 40 oC and a pressure of 150 kPa. Thepiston is 1 m in diameter and initially 20 cm above the base of thecylinder. Heat is added at constant pressure until the piston hasmoved 30 cm, so it's now at 50 cm.

I found the mass of the system to be 0.2898 kg, and T2 =783K.

a) Using the table of properties of oxygen as an ideal gas,calculate the heat added to the system per unit mass, in kJ/kg

b) Repeat this calculation assuming that the specific heat as afunction of temperature is linear over this range of temperatures(ie, assuming the change in temperature is \"small\")

c) Repeat this calculation without this assumption (ie, directintegration of empirical relation)

Answer & Explanation Solved by verified expert
4.3 Ratings (857 Votes)
Assume a pistoncylinder arrangementwith a piston diameter1marea of the piston A0785 12 785 m2at an initial condition temperatureT1 273 40 313 KPressure P1 150 kPa Volume V1 A L1 785 02 0157m3 L1 2 m GIVENHere in this system heat is added atconstant pressure so initial pressure P1 finalpressure P2 150    See Answer
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