ch20-p050

# ch20-p050 - and 2: Q in = Q 1 + Q 2 = nC V ( T H – T L )...

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50. The net work is figured from the (positive) isothermal expansion (Eq. 19-14) and the (negative) constant-pressure compression (Eq. 19-48). 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 19-3). 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.

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