Saturated methyl chloride at 430 kPa(abs) condenses on a horizontal 10*10 bank of tubes. The 5 cm-OD tubes are equally spaced and are 10 cm apart center-to-center on rows and columns. If the surface temperature of the tubes is maintained at 7°C by pumping water through them, calculate the rate of condensation of methyl chloride in kg/(m s).
GIVEN
? Saturated methyl chloride condensing on a ten-by-ten bank of horizontal tubes
? Pressure = 430 kPa
? Tube outside diameter (D) = 5 cm= 0.05 m
? Tube center-to-center spacing (s) = 10 cm= 0.1 m
? Methyl chloride properties given above
? Tube surface temperature (Ts) = 70C
FIND
? The rate of condensation (
m
/L) in kg/(m s)
ASSUMPTIONS
? Steady state
? Laminar flow condensation
? Interfacial shear is negligible
? Tube surface temperature is uniform and constant
? Vapor density is negligible compared to the liquid density
SKETCH
The average heat transfer coefficient for a vertical row of tubes including liquid subcooling is given by Equation (9.24)
Where N = the number of tubes in a vertical row = 10
Assuming the vapor density is negligible compared to the liquid density
The rate of heat transfer is
The rate of condensate flow is given by
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