Proposals for an Extended Form of the Thermal Performance Formula for more Accurate Evaluation of Tank Furnace Data

JSGT 1948 V32 T070-T087

The derivation of the thermal performance formula for a single furnace is examined and the assumptions entailed are discussed. It is pointed out that the working end of the furnace should be taken into account in the evaluation of the heat used in glass making. Similarly, it is suggested that the heat availability of the combustion space be substituted by the “heat retained” by the furnace system as a whole. This is possible by application of Schack's theory of heat exchangers and leads to a re-evaluation of the load correction and to a modified temperature correction. From these considerations an extended formula is derived and subsequently discussed.

H. Brondum-Nielsen