Chapter 10 Boiling and Condensation10-57 Saturated refrigerant-134a vapor at a saturation temperature of Tsat= 30°C condenses inside a horizontal tube which is maintained at 20°C. The fraction of the refrigerant that will condense at the end of the tube is to be determined.Assumptions1Steady operating conditions exist.2The tube is isothermal. 3 The vapor velocity is low so that Revapor< 35,000. PropertiesThe properties of refrigerant-134a at the saturation temperature of 30°C are hfg= 173.1×103J/kg and ρv= 37.53 kg/m3. The properties of liquid R-134a at the film temperature of 20)/2 = 25°C are (Table A-10) TTTfs=+()/sat2(=30 +CW/m.08325.0CJ/kg.1427C/sm101667.0/kg/m.s102.012kg/m12072643°=°=×==×==−−lpllllllkρμνμρAnalysisThe heat transfer coefficient for condensation inside horizontal tubes is R-134a 30°C ondensate20°C CW/m2.509C0)2C)(30J/kg1427(83+J/kg101.173C0)2s)(30kg/m10012.2(C)W/m08325.0)(kg/m)53.371207)(kg/m1207)(m/s81.9(555.0
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This note was uploaded on 01/24/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.