A counter flow double pipe heat exchanger has an outer pipe of 4-nom sch 40 com-mercial steel and an

A counter flow double pipe
heat exchanger has an outer pipe of 4-nom sch 40 com-mercial steel and an inner
tube of 2-std type M copper. Hard water at an average temperature of 120°F
flows in the tube at a flow rate of 80 gpm. City water flows in the annulus at
a flow rate of 75 gpm and an average temperature of 50°F. The heat exchanger is
a single DPHX with a length of 6 ft. After one year of service, the volumetric
flow rates in the tube and annulus are estimated to experience a 2.5% reduction
due to fouling. The fouling layer is primarily calcium carbonate. Determine the
pressure drop and

A counter flow double pipe
heat exchanger has an outer pipe of 4-nom sch 40 com-mercial steel and an inner
tube of 2-std type M copper. Hard water at an average temperature of 120°F
flows in the tube at a flow rate of 80 gpm. City water flows in the annulus at
a flow rate of 75 gpm and an average temperature of 50°F. The heat exchanger is
a single DPHX with a length of 6 ft. After one year of service, the volumetric
flow rates in the tube and annulus are estimated to experience a 2.5% reduction
due to fouling. The fouling layer is primarily calcium carbonate. Determine the
pressure drop and the power required (watts) to move the water through the:

a. Inner tube for clean
and fouled conditions

b. Annulus for clean and
fouled conditions

c. Determine the increased
power requirement (watts) due to fouling to move the water through the tube.

d. Determine the increased
power requirement (watts) due to fouling to move the water through the annulus.

e. Based on your answers
in Parts (c) and (d), is fouling a concern from a hydraulic point of view?

 

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