2300_les08 - III. Evaluating Properties F. Property Tables...

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1 lesson 8 III. Evaluating Properties F. Property Tables 1. What’s in the tables and why •specific volumes, v (m 3 /kg) (as v, v i , v f , v g ) •pressure, P (kPa) •temperature, T (C) •internal energy, u (kJ/kg) (as u, u i , u f , u g , u ig , u fg ) •enthalpy, h = u + Pv (kJ/kg) (as h, h i , h f , h g , h ig , h fg ) •entropy, s (kJ/kg K) (as s, s i , s f , s g , s ig , s fg ) The functional relationships between the properties are complex and are therefore tabulated for convenience. i = saturated solid (ice) f = saturated liquid (fluid) g = saturated vapor (gas) ig = value for g - value for i fg = value for g - value for f These subscripts are only used in two-phase regions. lesson 8 III. Evaluating Properties 1. What’s in the tables and why Boiler Turbine Pump Condenser out , T W ± out Q ± in Q ± in , P W ± Vapor- liquid mix. Liquid Liquid Vapor 4 1 2 3 log(v) log(P) 1 3 4 2 Simple, ideal vapor power cycle (Rankine cycle, Ch. 10, p. 553). Shaded area is net work out. Saturated liquid line Saturated vapor line
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2 lesson 8 III. Evaluating Properties 2. Saturated liquid and vapor states (saturation dome) a. Table A-4, properties as a function of T sat b. Table A-5, properties as a function of P sat c. When both the liquid and vapor phases are present, define the quality, x, as the weight fraction of vapor. d. Use the quality to calculate the properties of the mixture. f g fg fg f g f fg f total vapor liq vapor total v v v xv v xv v ) x 1 ( v v v v AC AB m m x m m m = + = + = = = = + = P or T v AB C v f v g v Quality is a function of the horizontal distances on P-v and T-v diagrams.
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2300_les08 - III. Evaluating Properties F. Property Tables...

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