Evaluating Specific Internal Energy and Enthalpy A new property:Enthalpy,H Control volume (unit:J,KJ) ”=光 FIGURE 3-25 The combination u+Pv is frequently encountered in the analysis of control volumes. PropertyAll properties 0 For a unit mass,h (unit:J/g,kJ/kg) m'/kg I kJ/kg kJ/kg I kJ/kg K p=0.06bar=0.006MPa (T=36.16C) h u+pu Sat. 23.739 2425.0 2567.4 8.3304 80 27.132 2487.3 2650.1 8.5804 120 30.219 2544.7 2726.0 8.7840 per mole (unit:J/mol,kJ/kmol) 160 33.302 2602.7 2802.5 8.9693 200 36.383 2661.4 2879.7 9.1398 240 39.462 2721.0 2957.8 9.2982 h=u+p而 280 42.540 2781.5 3036.8 9.4464 320 45.618 2843.0 3116.7 9.5859 360 48.696 2905.5 3197.7 9.7180 400 51.774 2969.0 3279.6 9.8435 440 54.851 3033.5 3362.6 9.9633 500 59.467 3132.3 3489.1 10.1336 上游通大学 March 14,2019 2 SHANGHAI JLAO TONG UNIVERSITYMarch 14, 2019 2 Evaluating Specific Internal Energy and Enthalpy A new property: Enthalpy, H Property All properties For a unit mass, h (unit: J/g, kJ/kg) per mole (unit: J/mol, kJ/kmol) (unit: J, kJ)