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Shell and Tube Heat Exchanger

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Shell and Tube Heat Exchanger. Frank Faulkenberg. Jimmy Huser ... Minimize heat exchanger shell and tube weight hence the cost ... Tube. Outlet ( C) Inlet ( C) ... – PowerPoint PPT presentation

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Title: Shell and Tube Heat Exchanger


1
Shell and Tube Heat Exchanger
ME 414 Thermal Fluids
  • Frank Faulkenberg
  • Jimmy Huser
  • John Snodgrass
  • Eric Bush
  • David Giles

2
Problem Statement
  • Design a heat exchanger to meet the customer
    requirements for heat transfer and maximum
    dimensions, while optimizing the weight and
    pressure losses in both the tube and shell sides.

3
Project Definition
  • Chemical Specifications
  • Temperature must be reduced from 40C to 25C
  • Mass flow rate is 120,000 kg/hr
  • Material properties closely approximate that of
    water
  • Cooling Water Specifications
  • Treated city water at 20C
  • Mass flow rate is not fixed
  • Exit temperature is function of design

4
Customer Requirements
  • Must cool the chemical from 40 C to 25 C
  • Heat exchanger length can not exceed 7m
  • Heat exchanger shell diameter can not exceed 2m
  • Minimize heat exchanger shell and tube weight
    hence the cost
  • Minimize heat exchanger pressure drop

5
Analysis
  • Matlab
  • Used to run code that takes the input variables
    that affect exchanger performance and returns
    numerical values for the performance of the
    exchanger
  • Minitab
  • Used to statistically analyze the results from
    Matlab to narrow down the input variables to
    those that have the greatest affect of exchanger
    performance.

6
First Trial
  • Total heat exchanger weight 4384.68 kg
  • Desired Heat Transfer Rate 2088969 W
  • Calculated Heat Transfer Rate 2084742 W
  • Difference
    4227.48 W
  • Desired-to-Calculated Ratio 1.00
  • Shell Side Delta-P 9875.34
    Pa
  • Tube Side Delta-P 134.48
    Pa

7
Analyzing data
  • Good
  • Light in weight
  • Good pressure drops
  • Achieved desired-to-calculated ratio

8
Analyzing data
  • Bad
  • Further inspection shows that this design is
    impossible.
  • Shell side outlet cannot be greater than the tube
    side outlet for a parallel heat exchanger.
  • For parallel flow, a shell mass flow rate of
    400000 kg/hr must be used to satisfy this
    condition

9
(No Transcript)
10
Second Trial
  • Parallel flow
  • No baffles
  • About 4 meters in length

11
Analyzing Data
  • Good
  • Yielded very low weight
  • Very low pressure drops
  • Desired heat transfer
  • Bad
  • Impossible design in reality
  • Structurally unsound, tubes would sag

12
Critical Parameter Flow Down
  • 14 parameters
  • 7 factor DOE
  • 4 factor DOE

13
Initial Parameters
  • Tube length
  • Tube diameter (OD)
  • Shell diameter (ID)
  • Mass Flow Rate of cooling water
  • Pipe layout
  • Baffle Spacing
  • Shell material
  • Tube material
  • Shell thickness
  • Tube thickness
  • Flow configuration (counter, parallel)
  • Pipe layout angle
  • Number of Tubes
  • Tube Pitch

14
1st DOE
  • Tube length
  • Tube diameter (OD)
  • Shell diameter (ID)
  • Mass Flow Rate of cooling water
  • Pipe layout
  • Baffle Spacing
  • Shell material

15
7 factor MEPs
16
2nd DOE
  • Tube length
  • Tube diameter (OD)
  • Shell diameter (ID)
  • Mass Flow Rate of cooling water

17
4 factor MEPs
18
4 factor MEPs
19
4 factor MEPs
20
4 factor MEPs
21
4-factor Interaction Plots
22
Pareto Charts
23
Final Design
24
Expected Performance
  • Total heat exchanger weight 4868 kg
  • Desired Heat Transfer Rate 2088969 W
  • Calculated Heat Transfer Rate 2095309 W
  • Difference -6340 W
  • Desired-to-Calculated Ratio 1.00
  • Shell Side Delta-P 9228 Pa
  • Tube Side Delta-P 556 Pa

25
References
  • 1 Jones, Luke. Minitab tutorial.
  • 2 Toksoy, John. Heat Exchanger Project fall
    2006.
  • 3 Toksoy, John. TFD-HE4 Log Mean Temperature
    Difference. fall 2006
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