P21_028 - under the two lines, and the net contribution is...

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28. During the adiabatic processes (the vertical lines in Fig. 21-9) there is no heat transfer, so we only consider the isothermal processes (the horizontal lines). We can interpret Eq. 21-2, Q = T S ,a s represent the “area” (with appropriate ± sign) under the horizontal lines. Since a b is in the positive direction while c d
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Unformatted text preview: under the two lines, and the net contribution is the rectangular area between them. This can be seen explicitly as follows: Q net = T H ( S b S a ) + T L ( S d S c ) = ( T H T L ) ( S max S min ) where we have used the fact that S b = S c = S max and S a = S d = S min ....
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