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ISSN Online: 2377-424X

International Heat Transfer Conference 12
August, 18-23, 2002, Grenoble, France

Model for Heat Transfer in a Float Glass Annealing Lehr

Get access (open in a dialog) DOI: 10.1615/IHTC12.3590
6 pages

要約

Sandia National Laboratories has been working under the sponsorship of DOE Office of Industrial Technology to investigate and improve the control and operation of annealing lehrs used in the production of float glass. This paper presents a fully coupled 3-dimensional model of heat transfer in a float glass annealing lehr that is designed to execute rapidly on a small computer workstation so that it may be used by process engineers to determine optimum set points for lehr operation. The model includes heat conduction and advection in the moving glass ribbon as well as the semitransparent nature of radiative transfer in the glass. The model also accounts for the mass flow of air and heat transfer in the cooling ducts and surface-to-surface radiative exchange between the exterior walls of the ducts and the glass ribbon. Results from the model show the effects of operating conditions on the glass temperature in a typical lehr and illustrates the use of mathematical modeling to improve design, operation, and control. The model executes rapidly enough on a small computer workstation that it may also be suitable for use in real-time model-based control.