764 if the flow through the device is reversible and

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Unformatted text preview: plifies to Steady-flow, single-stream, adiabatic: · Sgen · m (se si) (7–86) which indicates that the specific entropy of the fluid must increase as it flows · through an adiabatic device since S gen 0 (Fig. 7–64). If the flow through the device is reversible and adiabatic, then the entropy will remain constant, se si, regardless of the changes in other properties. EXAMPLE 7–17 Entropy Generation in a Wall Consider steady heat transfer through a 5-m 7-m brick wall of a house of thickness 30 cm. On a day when the temperature of the outdoors is 0°C, the house is maintained at 27°C. The temperatures of the inner and outer surfaces of the brick wall are measured to be 20°C and 5°C, respectively, and the rate of heat transfer through the wall is 1035 W. Determine the rate of entropy generation in the wall, and the rate of total entropy generation associated with this heat transfer process. cen54261_ch07.qxd 11/18/03 9:57 AM Page 325 325 CHAPTER 7 SOLUTION We first take the wall as the system (Fig. 7–65). This is a closed syste...
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