Development of a dynamic thermal system model for a low inertia reheating furnace: Comparison of test data with predictions

Conference · Thu Jul 01 04:00:00 EDT 1999

OSTI ID:20026792

Yoshino, H; Viskanta, R

The batch, indirectly-fired furnace, called low inertia furnace (LIF), is simulated using a dynamic thermal model. The load consisting of a basket filled with small parts is placed on the hearth (bottom) of the furnace, and the LIF is heated by flat radiant heaters (FRH) which are installed on the sidewalls, the ends and the roof of the furnace. Transient heat transfer in the load, walls, roof and gas are modeled. Natural gas is burned in the heaters, but the combustion and heat transfer processes in the FRHs are not treated. Instead, measured heater surface temperature vs. time is used to drive the dynamic thermal system model. The mathematical model of the furnace integrates the models for heat transfer within the enclosure and walls with the porous medium load model. Radiation heat exchange between the load, the radiant heaters and the furnace walls are analyzed using the radiosity method. Heat transfer in the porous medium is by conduction, radiation and convection between the solid and gas phases. Radiation within the load is considered to be a diffusion process. Two different porous medium models for the load are developed, and the model predictions are compared with test data obtained by the Institute of Gas Technology on a low inertia indirectly-fired furnace. Parametric calculations are performed to identify the important model parameters and validate the models.

• Research Organization: Purdue Univ., West Lafayette, IN (US)
• OSTI ID: 20026792
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
GAS FURNACES
HEAT TRANSFER
MATHEMATICAL MODELS
NATURAL GAS
PARAMETRIC ANALYSIS
RADIANT HEATERS
THERMAL ANALYSIS