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 (water & refrigerants) Tables A-2 to 8 & A-11 to 13 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 0 v T 0 p dT C u dT C h This chart was inspired by Subrata Bhattacharjee, The Expert System for Thermodynamics ,