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DISCUSSION OF RESULTS
In order to arrive at a definite conclusion regarding the respective merits
of the Wilson, Lobo and Hottel empirical equation and the theoretical equation,
the heat absorbed by the oil in the radiant section as predicted by these two
equations has been compared to the actually observed heat absorption.
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The radiant section will be defined as that section in which the heat is
liberated and in which the heat transfer is primarily by radiation from the hot
gas mass and the hot refractory surfaces. The cold or ultimate heat-receiving
surface is considered to consist of those tubes which can "see" to a greater or
less extent the main gas mass. This emphasis has been made because in the case
of certain furnaces the first rows of tubes in the convection section can see
the main gas mass. The plane area * of these tubes, Acp' must
be considered as a part of the radiant section equivalent cold plane surface,
aAcp' In furnaces where the
convection section is placed behind a bridge wall, out of sight of the main gas
mass, the projected area of the convection section is not considered to be part
of the radiant section cold surface. <--
page 4 (part2) -- page 2 -->
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