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Unformatted text preview: ntropy transfer between an extended system and the
surroundings, the boundary temperature of the extended system is simply
taken to be the environment temperature. Closed Systems
A closed system involves no mass flow across its boundaries, and its entropy
change is simply the difference between the initial and final entropies of the
system. The entropy change of a closed system is due to the entropy transfer
accompanying heat transfer and the entropy generation within the system
boundaries. Taking the positive direction of heat transfer to be to the system,
the general entropy balance relation (Eq. 7–76) can be expressed for a closed
Closed system: Qk
Tk Sgen ∆Ssystem S2 S1 (kJ/K) (7–79) The entropy balance relation above can be stated as: the entropy change of a
closed system during a process is equal to the sum of the net entropy transferred through the system boundary by heat transfer and the entropy generated within the system boundaries.
For an adiabatic process (Q 0), the entr...
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This document was uploaded on 11/28/2012.
- Spring '09