The actual heat to the oil is obtained by subtracting the enthalpy of the flue gas leaving the radiant section from the enthalpy of the entering fuel and air, and then subtracting the estimated external losses, plus the direct radiant heat from the combustion chamber absorbed by the first rows of the convection section. The latter item is obtained by a convection section heat balance , gas side versus oil side, in which the heat lost by the gas is considered between the actually measured true gas temperature of the gases entering and leaving the section. A summary of the test data required and a short outline of the method of calculation are included in the Appendix.

Table III gives a summary of the test data and calculations for all eighty-five tests which have been used as an independent check on the validity of the derived theoretical equation. The ratio of the actual heat absorbed by the oil in the radiant section to that predicted by both the empirical and theoretical equations is given for each of the individual tests. The deviations of any test from the average deviations for a given furnace can thus be readily seen. <-- page 3 -- page 1 (part3)-->

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