Thermodynamics HW Solutions 855

Thermodynamics HW Solutions 855 - Chapter 10 Boiling and...

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Chapter 10 Boiling and Condensation 10-78E Steam at a saturation temperature of T sat = 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. Assumptions 1 Steady operating conditions exist. 2 The 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, ρ vl << . Properties The properties of water at the saturation temperature of 100 ° F are h fg = 1037 Btu/lbm and ρ v = 0.00286 lbm/ft 3 . The properties of liquid water at the film temperature of TTT fs = + () / sat 2 = (100 + 80)/2 = 90 ° F are (Table A-9E), 6 ft 80 ° F Condensate Steam 100 ° F μ νμ l l ll l pl l k = =⋅ == ° ° 6212 1842 0 02965 0999 0358 3 . . /. . . lbm / ft lbm / ft h ft / h C B t u / l b m F Btu / h ft F 2 Analysis The modified latent heat of vaporization is Btu/lbm 1051 = F ) 80 F)(100 Btu/lbm 999 . 0 ( 0.68 + Btu/lbm 1037 ) ( 68 . 0
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