Chapter 10 Boiling and Condensation10-81 Saturated steam at 270 kPa pressure and thus at a saturation temperature of Tsat= 130°C (Table A-9) condenses inside a horizontal tube which is maintained at 110°C. The average heat transfer coefficient and the rate of condensation of steam are 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 water at the saturation temperature of 130°C are hfg= 2174×103J/kg and ρv= 1.50 kg/m3. The properties of liquid water at the film temperature of TTTfs=+=()/sat2(130 + 110)/2 = 120°C are (Table A-9), ρμνμlllllpllk==×==×=°−−94340 232 100 246 1042440683336../..kg / mkg / m.sm/sCJ / kg. CW/m. C2Steam 270.1 kPa Condensate110°CDtube = 3 cmLtube= 6 mAnalysisThe condensation heat transfer coefficient is determined from CW/m33452°⋅=⎥⎦⎤⎟⎠⎞⎜⎝⎛
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