Thermodynamics HW Solutions 696

Thermodynamics HW Solutions 696 - Chapter 8 Internal Forced...

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Unformatted text preview: Chapter 8 Internal Forced Convection 8-74 Water is heated in a heat exchanger by the condensing geothermal steam. The exit temperature of water and the rate of condensation of geothermal steam are to be determined. Assumptions 1 Steady operating conditions exist. 2 The inner surfaces of the tube are smooth. 3 Air is an ideal gas with constant properties. 4 The surface temperature of the pipe is 165 C, which is the temperature at which the geothermal steam is condensing. Properties The properties of water at the anticipated mean temperature of 85 C are (Table A-9) kJ/kg 5 . 2066 /s m 10 44 . 3 kg/m 968.1 kg/m.s 10 333 . 08 . 2 Pr C J/kg. 4201 C W/m. 673 . kg/m 1 . 968 C 165 @ 2 7- 3 3 3 = = = = = = = = fg p h C k 14 m Water 20 C 0.8 kg/s 4 cm T s = 165 C T e Analysis The velocity of water and the Reynolds number are m/s 5676 . 4 m) 04 . ( ) kg/m 1 . 968 ( kg/s 8 ....
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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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