A DPHX is made of a 6-nom sch 40 commercial steel outer pipe and a 5-nomsch 40S stainless steel inner pipe. The fluid in the annular space is cyclohexane that has a volumetric flow rate of 120 gpm and an average temperature of 60°F. The fluid in the inner tube is water at an average temperature of 180°F and flowing at 320 gpm. Cyclohexane is an organic liquid and the water can be assumed to be distilled water. The thermal conductivity of the stainless steel inner pipe is 9.5 Btu/h·ft·°F. Determine the following: a. Convective heat transfer coefficients in the inner pipe and the annulus (Btu/h·ft2·°F). b. Overall heat transfer coefficient for the case of a clean heat exchanger (Btu/h·ft2·°F). c. Overall heat transfer coefficient if fouling is considered (Btu/h·ft2·°F).
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 DPHX is made of a 6-nom sch 40 commercial steel outer pipe and a 5-nomsch 40S stainless steel inner pipe. The fluid in the annular space is cyclohexane
that has a volumetric flow rate of 120 gpm and an average temperature of 60°F. The fluid in the inner tube is water at an average temperature of 180°F and
flowing at 320 gpm. Cyclohexane is an organic liquid and the water can be assumed to be distilled water. The thermal conductivity of the stainless steel
inner pipe is 9.5 Btu/h·ft·°F. Determine the following:
a. Convective heat transfer coefficients in the inner pipe and the annulus (Btu/h·ft2·°F).
b. Overall heat transfer coefficient for the case of a clean heat exchanger (Btu/h·ft2·°F).
c. Overall heat transfer coefficient if fouling is considered (Btu/h·ft2·°F).
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