The problem of correlating the heat-absorption efficiencies of coal-burning equipment has been studied for many years with little more than a modicum of success. It has been consistently pointed out that one of the major problems of correlating data such as these has been the lack of precise furnace data. This paper describes the attempt at using statistics to correlate more reliable furnace data by means of the Broido, Hudson-Orrok, a modified Hudson-Orrok, Wohlenberg, and Hurvich correlations. Results suggest that information about flame temperatures, flame volumes, and emissivities and temperatures of flames and slag-ash-covered boiler-tube walls are necessary before precise correlations can be made.

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