Chapter 10 Boiling and Condensation10-78E Steam at a saturation temperature of Tsat= 100°F condenses on a vertical plate which is maintained at 80°C. The rate of heat transfer to the plate and the rate of condensation of steam per ft width of the plate are to be determined.Assumptions1Steady operating conditions exist.2The plate is isothermal. 3 The condensate flow is wavy-laminar over the entire plate (this assumption will be verified). 4 The density of vapor is much smaller than the density of liquid, ρvl<<. PropertiesThe properties of water at the saturation temperature of 100°F are hfg= 1037 Btu/lbm and ρv= 0.00286 lbm/ft3. The properties of liquid water at the film temperature of TTTfs=+()/sat2=(100 + 80)/2 = 90°F are (Table A-9E), 6 ft80°F CondensateSteam100°Fμνμlllllpllk==⋅==°⋅°621218420 02965099903583../...lbm / ftlbm / ft hft / hC Btu/lbmFBtu / h ft F2AnalysisThe modified latent heat of vaporization is Btu/lbm1051=F)80F)(100Btu/lbm999.0(0.68+Btu/lbm1037)(68.0
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