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International Heat Transfer Conference 10

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

HEAT TRANSFER AND PRESSURE DROP IN A GRAPHITE BLOCK HEAT EXCHANGER

G. Schou
Department of Chemical and Materials Engineering, The University of Auckland, Auckland, New Zealand

A. Berndt
Department of Chemical and Materials Engineering, The University of Auckland, Auckland, New Zealand

Joe Deans
Department of Mechanical Engineering, University of Auckland, Auckland, New Zealand

J. Kunzel
Process Equipment Division, SGL Carbon GmbH, Meitingen, Germany

Hans Muller-Steinhagen
Institute for Technical Thermodynamics, German Aerospace Research Centre (DLR), Stuttgart; Institute for Thermodynamics and Thermal Engineering, University of Stuttgart, Germany Pfaffenwaldring 38-40, D-70569 Stuttgart, Germany

DOI: 10.1615/IHTC10.2140
pages 417-422

Аннотация

A test rig has been assembled to investigate the thermodynamic and hydraulic performance of a cylindrical graphite block heat exchanger consisting of three graphite blocks and a steel shell. The flow pattern is triple cross-flow on the shell-side with one pass per block and single pass on the tube-side. Overall heat transfer coefficients and pressure drops have been measured for a range of operating conditions.
Additionally, accurate data have been obtained on the variation of the thermal conductivity of the graphite with orientation, manufacturing process and impregnant content. A three-dimensional finite element model has been set-up to determine the effective thermal resistance of the graphite matrix. This value was then used together with the calculated shell and tube-side heat transfer coefficients to predict the overall heat transfer coefficient.

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