A double pipe heat exchanger is constructed with a 5-nom sch 40 commercial steel outer pipe and a…

A double pipe heat
exchanger is constructed with a 5-nom sch 40 commercial steel outer pipe and a
2½-std type M copper inner tube. The heat exchanger is 2-m long. Water flows in
the tube at an average temperature of 30°C and a flow rate of 5 kg/s. A 30%
ethanol-water solution flows in the annulus with an average temperature of 5°C
and a mass flow rate of 12 kg/s. For a clean heat exchanger, determine the,

a. UA product of the heat
exchanger (W/K)

b. Pressure drop through
the tube and annulus (kPa)In an effort to increase the heat transfer rate with
a heat exchanger of the same footprint,

A double pipe heat
exchanger is constructed with a 5-nom sch 40 commercial steel outer pipe and a
2½-std type M copper inner tube. The heat exchanger is 2-m long. Water flows in
the tube at an average temperature of 30°C and a flow rate of 5 kg/s. A 30%
ethanol-water solution flows in the annulus with an average temperature of 5°C
and a mass flow rate of 12 kg/s. For a clean heat exchanger, determine the,

a. UA product of the heat
exchanger (W/K)

b. Pressure drop through
the tube and annulus (kPa)In an effort to increase the heat transfer rate with
a heat exchanger of the same footprint, it is proposed to replace the single 2
= -std type M inner tube with three 1-std type M tubes in a triangular
arrangement as shown in Figure P5.42. The water flow rate is split evenly
between the three tubes. For this modified design, determine the

c.UA product of the heat
exchanger (W/K)

d. Percent increase in the
UA product in the modified design compared to the original design

e. Pressure drop through
the tubes and annulus (kPa)

f. Percent increase in the
pressure drop through the inner tubes and annulus in the modified design
compared to the original design