Air, considered an ideal gas, is contained in an insulated piston-cylinder assembly outfitted with a paddle wheel. It is initially at p1 = 10 psi, T1 = 600°F, V1 = 1 ft. The paddle wheel transfers 3 Btu (by work) to the air to a final state of P2 = 5 psi, V2 = 3 ft. You may neglect potential and kinetic energy changes. Mair = 28.97 lbm/bmol. Find the mass of air in the closed chamber [lbm), the temperature at state 2 [OR], and the work done by the air to the piston (Btu).

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cjmejiab cjmejiab · Answer 1 · 2019-11-11T05:04:02+01:00

Our data are,

State 1:

[tex]P_1= 10psi=68.95kPa\\V_1 = 1ft^3=0.02831m^3\\T_1 = 100\°F = 310.93K[/tex]

State 2:

[tex]P_2 =5psi=34.474kPa\\V_2 = 3ft^3=0.0899m^3[/tex]

We know as well that [tex]3BTU=3.16kJ/K[/tex]

To find the mass we apply the ideal gas formula, which is given by

[tex]P_1V_1=mRT_1[/tex]

Re-arrange for m,

[tex]m= \frac{P_1V_1}{RT_1}\\m= \frac{68.95*0.02831}{(0.287)310.9}\\m=0.021893kg=0.04806lbm\\[/tex]

Because of the pressure, temperature and volume ratio of state 1 and 2, we have to

[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]

Replacing,

[tex]T_2 = \frac{P_2V_2}{P_1V_1}T_1\\T_2 =\frac{34.474*0.0844}{68.95*0.02831}*310.93\\T_2 = 464.217K=375.5\°F[/tex]

For conservative energy we have, (Cv = 0.718)

[tex]W = m C_v = 0.718 \Delta T +dw\\dw = W - mv\Delta T\\dw = 3.16-(0.0218*0.718)(454.127-310.93)\\dw = 0.765kJ=0.72BTU[/tex]