Transient open systems in Thermodynamics | Understanding Thermodynamics | Mechanical Engineering

Introduction to transient open systems in Mechanical Engineering Thermodynamics.
00:00 Intro
01:34 Example with heat added
05:08 Example with boundary work
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This video discusses transient open systems in mechanical engineering thermodynamics.
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[@tshepangtshekoeng3486]

Good day sir. I notice that you say that on the right side of the equation: its superheated steam with its internal energy but you substituted the value of when T=100c with u sat value: 2505.6 instead of using T=150c with u sat value:2582.9 from the superheated table. I see that you substituted v= 1.9367 at T=150c and not v= 1.6729.
ARe we ignoring stage 2 where the water starts to boil and only considering stage 1 at T=20c and at stage 3 at T=150?