Thermodynamics HW Solutions 836

Thermodynamics HW Solutions 836 - Chapter 10 Boiling and...

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Chapter 10 Boiling and Condensation 10-53 Saturated ammonia vapor at a saturation temperature of T sat = 10 ° C condenses on the outer surface of a horizontal tube which is maintained at -10 ° C. The rate of heat transfer from the ammonia and the rate of condensation of ammonia are to be determined. Assumptions 1 Steady operating conditions exist. 2 The tube is isothermal. Properties The properties of ammonia at the saturation temperature of 10 ° C are h fg = 1226 × 10 3 J/kg and ρ v = 4.870 kg/m 3 (Table A-11). The properties of liquid ammonia at the film temperature of 10 + (-10))/2 = 0 ° C are (Table A-11), TT T fs =+ () / sat 2 ( = C W/m 5390 . 0 C J/kg 4617 C /s m 10 2969 . 0 s kg/m 10 896 . 1 kg/m 6 . 638 2 6 4 3 ° = ° = × = × = = l pl l l l k ν μ ρ Analysis The modified latent heat of vaporization is J/kg 10 1288 = C )] 10 ( C[10 J/kg 4617 0.68 + J/kg 10 1226 ) ( 68 . 0 3 3 sat * × ° ° × × = + = s pl fg fg T T C h h Ammonia 10 ° C Condensate -10 ° C D tube = 2 cm L tube = 8 m Noting that the tube is horizontal, the condensation heat transfer coefficient is determined from
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This note was uploaded on 01/24/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.

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