A 1-shell-pass and 8-tube-passes heat exchanger is used to heat glycerin (cp = 0.60 Btu/lbm·°F) from 65°F to 140°F by hot water (cp = 1.0 Btu/lbm·°F) that enters the thinwalled 0.5-in-diameter tubes at 175°F and leaves at 120°F. The total length of the tubes in the heat exchanger is 500 ft. The convection heat transfer coefficient is 4 Btu/h·ft2·°F on the glycerin (shell) side and 50 Btu/h·ft2·°F on the water (tube) side. Determine the rate of heat transfer in the heat exchanger (a) before any fouling occurs and (b) after fouling with a fouling factor of 0.002 h·ft2·°F/Btu on the outer surfaces of the tubes.
Heat Exchangers
Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.
Heat Exchanger
The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.
A 1-shell-pass and 8-tube-passes heat exchanger
is used to heat glycerin (cp = 0.60 Btu/lbm·°F) from 65°F to
140°F by hot water (cp = 1.0 Btu/lbm·°F) that enters the thinwalled
0.5-in-diameter tubes at 175°F and leaves at 120°F.
The total length of the tubes in the heat exchanger is 500 ft.
The convection heat transfer coefficient is 4 Btu/h·ft2·°F on
the glycerin (shell) side and 50 Btu/h·ft2·°F on the water
(tube) side. Determine the rate of heat transfer in the heat
exchanger (a) before any fouling occurs and (b) after fouling
with a fouling factor of 0.002 h·ft2·°F/Btu on the outer surfaces
of the tubes.
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