Thermodynamics HW Solutions 858

Thermodynamics HW Solutions 858 - Chapter 10 Boiling and...

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Chapter 10 Boiling and Condensation 10-81 Saturated steam at 270 kPa pressure and thus at a saturation temperature of T sat = 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. Assumptions 1 Steady operating conditions exist. 2 The tube is isothermal. 3 The vapor velocity is low so that Re vapor < 35,000. Properties The properties of water at the saturation temperature of 130 ° C are h fg = 2174 × 10 3 J/kg and ρ v = 1.50 kg/m 3 . The properties of liquid water at the film temperature of TT T fs = + = () / sat 2 (130 + 110)/2 = 120 ° C are (Table A-9), ρ μ νμ l l ll l pl l k = == × 9434 0 232 10 0 246 10 4244 0683 3 3 6 . . /. . kg / m kg / m.s m/ s C J / kg. C W/m. C 2 Steam 270.1 kPa Condensate 110 ° C D tube = 3 cm L tube = 6 m Analysis The condensation heat transfer coefficient is determined from C W/m 3345 2 ° =
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