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TECHNICAL PAPERS: Heat Exchangers

Simulation Algorithm for Multistream Plate Fin Heat Exchangers Including Axial Conduction, Heat Leakage, and Variable Fluid Property

[+] Author and Article Information
I. Ghosh, S. K. Sarangi

Cryogenic Engineering Centre, Indian Institute of Technology, Kharagpur-721 302, India

P. K. Das1

Mechanical Engineering Department, Indian Institute of Technology, Kharagpur-721 302, Indiapkd@mech.iitkgp.ernet.in

1

Corresponding author.

J. Heat Transfer 129(7), 884-893 (Dec 27, 2006) (10 pages) doi:10.1115/1.2717938 History: Received June 26, 2006; Revised December 27, 2006

The effect of axial conduction through heat exchanger matrix, heat exchange with the surroundings, and variable fluid properties are included in the simulation algorithm of multistream plate fin heat exchangers. The procedure involves partitioning of the exchanger in both axial and normal directions, writing conservation equations for each segment, and solving them using an iterative procedure. In the normal direction, the exchanger is divided into a stack of overlapping two-stream exchangers interacting through their common streams. In the axial direction, the exchanger is successively partitioned to 2k segments, the final value of k being determined by the point where further partitioning has only marginal effect. The effects of axial conduction, heat leakage, and variable fluid properties are illustrated with the help of multistream heat exchanger examples solved by the above-mentioned technique.

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Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

A multistream plate fin heat exchanger seen as a stack of overlapping two-stream sub-exchangers

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Figure 2

Division of a three-stream exchanger into two-stream sub-exchangers

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Figure 3

Two-stream co-current heat exchanger with transverse heat addition and axial heat exchange with the neighboring segments

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Figure 4

Two-stream counter-current exchanger with transverse heat addition and axial heat exchange with the neighboring segments

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Figure 5

Flow diagram describing the iterative scheme to calculate outlet temperatures in a given section with known inlet condition of the fluid streams

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Figure 6

Temperature distribution of three-stream heat exchanger in absence of secondary effects for (a) counter-current–co-current and (b) co-current–counter-current arrangement of the example in Ref. 23

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Figure 7

Effect of axial conduction on a multistream plate fin heat exchanger performance (example II in Ref. 17) simulated using the area splitting and successive partitioning method

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Figure 8

Effect of axial conduction on a three-stream plate fin heat exchanger performance simulated using the area splitting and successive partitioning method. Specifications of the exchanger are given in Table 2.

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Figure 9

Heat leak from the insulated top end plate

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Figure 10

Heat leak from the insulated side bar in the ith layer

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Figure 11

Effect of external heat load on a four-stream plate fin exchanger performance (specifications given in Table 3)

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Figure 12

Effect of external heat load on a three-stream plate fin exchanger performance (specifications given in Table 4)

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Figure 13

Heat exchanger performance with and without variable fluid properties

Tables

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