Thermodynamics HW Solutions 848

Thermodynamics HW Solutions 848 - Chapter 10 Boiling and...

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Chapter 10 Boiling and Condensation Review Problems 10-72 Steam at a saturation temperature of T sat = 40 ° C condenses on the outside of a thin horizontal tube. Heat is transferred to the cooling water that enters the tube at 25 ° C and exits at 35 ° C. The rate of condensation of steam, the average overall heat transfer coefficient, and the tube length are to be determined. Assumptions 1 Steady operating conditions exist. 2 The tube can be taken to be isothermal at the bulk mean fluid temperature in the evaluation of the condensation heat transfer coefficient. 3 Liquid flow through the tube is fully developed. 4 The thickness and the thermal resistance of the tube is negligible. Properties The properties of water at the saturation temperature of 40 ° C are h fg = 2407 × 10 3 J/kg and ρ v = 0.05 kg/m 3 . The properties of liquid water at the film temperature of 50 + 20)/2 = 35 ° C and at the bulk fluid temperature of (25 + 35)/2 = 30 ° C are (Table A-9), TT T fs =+ () / sat 2 ( = = T b / in out 2 At 35 C: ° = =⋅ ° ° ρ μ l l pl l
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