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review_all - General Approach to Problem Solving Sketch the...

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General Approach to Problem Solving • Sketch the process. Define your system. Label all known and unknown quantities. • Choose a model for the working substance. • Write down the mass balance equation. • Write down the energy balance equation. • Write down the entropy balance equation. • Use specialized or combined forms as needed. Control volume or system Mass entering (1) Mass leaving (2) Q W
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Models of Working Substances Solid/ liquid Table A-3 C p = C v = C Gases Phase-change fluids refrigerants) Tables A-2 to 8 Mixtures (advanced) Perfect gas Pv = RT C p = constant C v = C p –R Table A-2a for C p . u = C v T, h = C p T . P and T are absolute. Ideal gas Pv = RT C p = f(T) Table A-2b,c. C v = C p –R Table A-17 to 25 for u and h. P and T are absolute. Real gas Figures A-15 RT Pv Z v v ) P , T ( f Z actual ideal actual R R = = = c R c R P P P T T T = = P and T are absolute. = = T
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This note was uploaded on 09/02/2010 for the course PHYS 2300 taught by Professor Silcox during the Fall '09 term at Utah.

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review_all - General Approach to Problem Solving Sketch the...

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