Chapter 10 Boiling and Condensation10-53 Saturated ammonia vapor at a saturation temperature of Tsat= 10°C condenses on the outer surface of a horizontal tube which is maintained at -10°C. The rate of heat transfer from the ammonia and the rate of condensation of ammonia are to be determined. Assumptions1Steady operating conditions exist.2The tube is isothermal. PropertiesThe properties of ammonia at the saturation temperature of 10°C are hfg= 1226×103J/kg and ρv= 4.870 kg/m3(Table A-11). The properties of liquid ammonia at the film temperature of 10 + (-10))/2 = 0°C are (Table A-11), TTTfs=+()/sat2(=CW/m5390.0CJ/kg4617C/sm102969.0skg/m10896.1kg/m6.6382643°⋅=°⋅=×=⋅×==−−lpllllkνμρAnalysisThe modified latent heat of vaporization is J/kg101288=C)]10(C[10J/kg46170.68+J/kg101226)(68.033sat*×°−−°⋅××=−+=splfgfgTTChhAmmonia 10°C Condensate-10°C Dtube= 2 cmLtube= 8 mNoting that the tube is horizontal, the condensation heat transfer coefficient is determined from
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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.