Closed systems a closed system involves no mass flow

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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 system as 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.

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