Entropy Balance Equation for Open Systems
Open
System
System
Notice that the integral disappears because Tsys is uniform over the surface at which heat transfer occurs.
SteadyState
0
+
+

Open Systems
Entropy Balance:
=

+
+
Rate at which the entropy of the system changes
Rate at which entropy flows into the system
Rate at which entropy flows out of the system
Rate at which entropy changes due to heat transfer into or out of the system
Rate at which entropy is generated within the system
=
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