Information Technology Reference
In-Depth Information
temperatures of the hot and cold feeds are 140 and 40
◦
F, respectively. Both streams
are at 14.696 psi. Use the Wilson property method.
Workshop 9.2
Use two Heater blocks with a heat stream transferring the heat
between the blocks for the specifications given in Workshop 9.1.
Workshop 9.3
Create an input file duplicating the input of Workshop 9.1. Change
the problem type to simulation. Remove the exchanger specification, that is, the outlet
temperature of the hot stream. Insert the
UA
value calculated in Workshop 9.1 and
insert the overall heat transfer coefficient of 100 Btu/(hr-ft
2
-
◦
R) in the U Methods
form. Run and compare the design to the simulation.
Workshop 9.4
Repeat Workshop 9.3 using a cocurrent heat exchanger. Compare the
results to Workshop 9.3. How do the results compare? What is the primary source of
the differences?
Workshop 9.5
An existing heat exchanger is to be used to cool 145,000 lb/hr of
benzene at 390
◦
F and 400 psia. The coolant is 490,000 lb/hr
n
-dodecane at 100
◦
F
and 200 psia. Aspen Plus's Heatx block is to be used with the detailed option. Search
Aspen Plus's Help for exchanger configuration for general information on exchanger
geometry.
Details of the exchanger design are as follows:
• Tema type E: one shell pass, two tube passes
• Countercurrent flow
• Horizontal alignment
• Hot fluid in the shell
• 2.75-ft inside shell diameter
• 0.5-inch shell-to-bundle clearance
• No sealing strips
•
U
calculated from film coefficients
• No fouling
• 200 tubes, length 32 ft, pitch 1.25 inches, square layout, carbon steel, inside
diameter 0.875 inch; outside diameter 1 inch
• 24 segmental baffles; baffle cut 0.2
• Tubesheet-to-baffle spacing and baffle-to-baffle spacing 1.2 inches
• Tubes in baffle window
• Shell-side nozzles 6 inches
• Tube-side nozzles 8 inches
Use Aspen Plus's defaults when necessary.
Workshop 9.6
Repeat Workshop 9.5 using the Rating Option.
Workshop 9.7
Repeat Workshop 9.5 using the Simulation Option.
