Within-Kiln Variability of Transmission Heat Losses

Transmission heat losses from an aluminum sandwich wall research kiln were measured using a thermal flux sensor to determine the causes of within-kiln variability in transmissional heat losses. Considerable differences between heat loss for side panels versus roof panels, the door, and floor were measured. The effect of including the variation in component heat loss in calculation of overall transmission heat loss for a commercial kiln was examined. Variability of transmission heat loss throughout a kiln structure was found to be caused primarily by areas of through-conductivity (especially the joints between panels), and to a lesser extent, by the direction of air circulation in the kiln and the location of the heating coils. The inclusion of the effects of joints and edges in calculation of transmission heat loss for a commercial kiln slowed an increase in total heat loss of 95 percent over that calculated neglecting variations in within kiln heat losses.

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