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50. The net work is figured from the (positive) isothermal expansion (Eq. 1914) and the
(negative) constantpressure compression (Eq. 1948).
Thus,
W
net
=
nRT
H
ln(
V
max
/
V
min
) +
nR
(
T
L
–
T
H
)
where
n
= 3.4,
T
H
= 500 K,
T
L
= 200 K and
V
max
/
V
min
= 5/2
(same as the ratio
T
H
/T
L
).
Therefore,
W
net
= 4468 J.
Now, we identify the “input heat” as that transferred in steps 1
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Unformatted text preview: and 2: Q in = Q 1 + Q 2 = nC V ( T H – T L ) + nRT H ln( V max / V min ) where C V = 5 R /2 (see Table 193). Consequently, Q in = 34135 J. Dividing these results gives the efficiency: W net /Q in = 0.131 (or about 13.1%)....
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This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics, Work

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