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Research Papers

Minimum Mass Polymer Seawater Heat Exchanger for LNG Applications

[+] Author and Article Information
P. Luckow1

Department of Mechanical Engineering, University of Maryland, College Park, MD 20742pluckow@umd.edu

A. Bar-Cohen

Department of Mechanical Engineering, University of Maryland, College Park, MD 20742

P. Rodgers

Department of Mechanical Engineering, The Petroleum Institute, P.O. Box 2533, Abu Dhabi, United Arab Emirates

1

Corresponding author.

J. Thermal Sci. Eng. Appl 1(3), 031009 (Apr 23, 2010) (10 pages) doi:10.1115/1.4001239 History: Received August 23, 2009; Revised February 08, 2010; Published April 23, 2010; Online April 23, 2010

The present study explores the thermofluid characteristics of a corrosion-resistant, thermally enhanced polymer composite, seawater-methane heat exchanger module for use in the liquefaction of natural gas on offshore platforms. Several metrics, including the heat transfer rate, the mass-specific heat transfer rate, and the total coefficient of performance (COPT), are used to compare the thermal performance of polymer composites having a range of thermal conductivities with that of corrosion-resistant metals. For operating conditions considered typical of the natural gas liquefaction industry in the Persian Gulf, a 10 W/m K polymer composite is found to provide nearly identical heat transfer rate to that of a corrosion-resistant titanium heat exchanger, almost 50% higher mass-specific heat transfer than for titanium (at 200 W pumping power), and COPT values approximately twice that of a least-material titanium heat exchanger. The results contribute to establishing the viability of using polymer composites for gas-liquid heat exchanger applications involving seawater and other corrosive fluids.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

Grahic Jump Location
Figure 6

Gas/liquid COPT in a counterflow parallel plate heat exchanger. W=L=1 m, Hfin=10 mm, tf=tb=1 mm. Liquid velocity: 1 m/s, Nfins,g=100, Nfins,l=5.

Grahic Jump Location
Figure 7

Gas/liquid thermal performance in a least-material design counterflow parallel plate heat exchanger. W=L=1 m, Hfin=10 mm, tb=1 mm, tf=topt. Liquid velocity: 1 m/s, Nfins,g=100, Nfins,l=5.

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Figure 1

Seawater/methane counterflow heat exchanger

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Figure 2

Least-material fin thickness as a function of heat transfer coefficient and thermal conductivity, Hfin=10 mm

Grahic Jump Location
Figure 3

Gas/Liquid thermal performance in a counterflow parallel plate heat exchanger. W=L=1 m, Hfin=10 mm, tf=tb=1 mm. Liquid velocity: 1 m/s, Nfins,m=100, Nfins,w=5.

Grahic Jump Location
Figure 4

Gas/liquid thermal performance in a counterflow parallel plate heat exchanger. W=L=1 m, Hfin=10 mm, tf=tb=1 mm. Liquid velocity: 1 m/s, Nfins,g=100, Nfins,l=5.

Grahic Jump Location
Figure 5

Gas/liquid thermal performance per unit mass in a counterflow parallel plate heat exchanger. W=L=1 m, Hfin=10 mm, tf=tb=1 mm. Liquid velocity: 1 m/s, Nfins,g=100, Nfins,l=5.

Grahic Jump Location
Figure 8

Gas/liquid thermal performance per unit mass in a least-material design parallel plate heat exchanger. W=L=1 m, Hfin=10 mm, tb=1 mm, tf=topt(tmin=0.1 mm). Liquid velocity: 1 m/s, Nfins,g=100, Nfins,l=5

Grahic Jump Location
Figure 9

Gas/liquid COPT in a least-material design parallel plate heat exchanger. W=L=1 m, Hfin=10 mm, tb=1 mm, tf=topt. (tmin=0.1 mm). Liquid velocity: 1 m/s, Nfins,g=100, Nfins,l=5.

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