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
You might also like to view...
Mars has almost no water.
Answer the following statement true (T) or false (F)
Are the Hawaiian Islands made up primarily of igneous, sedimentary, or metamorphic rock?
What will be an ideal response?
The brakes in a car work because of
a. Archimedes' principle. b. Pascal's principle. c. Bernoulli's principle. d. Torricelli's principle. e. none of these principles.
How much heat is required to melt 5.0 kg of ice at 0°C to water at 0°C?