1. A tank having a volume of 1.25 m³ initially contains water as a two-phase liquid-vapor mixture at 250°C and a quality

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1 A Tank Having A Volume Of 1 25 M Initially Contains Water As A Two Phase Liquid Vapor Mixture At 250 C And A Quality 1 (67.64 KiB) Viewed 50 times

1. A tank having a volume of 1.25 m³ initially contains water as a two-phase liquid-vapor mixture at 250°C and a quality of 0.9. Saturated water vapor at 250°C is slowly withdrawn through a pressure-regulating valve at the top of the tank as energy is transferred by heat to maintain the pressure constant in the tank. This continues until the tank is filled with saturated vapor at 250°C. Determine the amount of heat transfer, in kJ. Neglect all kinetic and potential energy effects. TABLE A-2 (Continued) Specific Volume Enthalpy Internal Energy kJ/kg m³/kg kJ/kg Sat. Sat. Sat. Sat. Sat. Liquid Vapor Temp. °℃ Liquid Vapor Liquid Evap. By X 10³ U₂ h₁ hig 250 1.2512 Da U₁ 0.05013 1080.4 0.04221 1128.4 2599.0 1134.4 2602.4 1085.4 1716.2 260 1.2755 1662.5 270 1.3023 0.03564 1177.4 2593.7 1184.5 1605.2 280 1.3321 0.03017 1227.5 2586.1 1236.0 1543.6 290 1.3656 0.02557 1278.9 2576.0 1289.1 1477.1 Press. bar 39.73 46.88 54.99 64.12 74.36 Sat. Vapor ho 2801.5 2796.6 2789.7 2779.6 2766.2