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NotesFirstLawClosedSystem

NotesFirstLawClosedSystem - Lecture(First law closed...

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Lecture (First law closed systems) J.C. Ordonez 1 Some notes on the First Law of Thermodynamics for a closed system The first law of thermodynamics is a statement of the conservation of energy. For a closed system we have: W Q E Σ Σ = Let’s discuss in some detail each term of the above equation: Energy Change: : E represents the change in energy experienced by the system. If the system experience a change from state 1 to state 2, we have: 1 2 E E E = In general we can write the energy change of a system as: ( ) other potential kinetic energy ernal int change 1 2 1 2 E ) E ( ) E ( U U E E + + + = 43 42 1 In many cases in thermodynamic analysis the changes in kinetic, potential and other forms of energy storage are negligible compared with the change in internal energy. In those cases, U E 1 2 1 2 U U E E You (the analyst) should decide when the assumption of negligible kinetic and potential energy changes is a valid one.
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Lecture (First law closed systems) J.C. Ordonez 2 HEAT interactions: Q : represents the net heat interactions. WORK interactions: W : represents the net work interaction. As we mentioned in class, there is a sign convention for the work and heat interactions. We will consider that work done BY the system to be
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