KNOWN: Dimensions, average surface temperature and emissivity of heating duct. Duct air inlet temperature and velocity. Temperature of ambient air and surroundings. Convection coefficient.
FIND: a) Heat loss from duct.
ASSUMPTIONS: 1) Steady-state conditions.
2) Constant air properties.
3) Negligible potential and kinetic energy changes of air flow.
4) Radiation exchange between a small surface and a large enclosure.
Calculation Reference
Fundamentals of Heat and Mass Transfer - Frank P. Incropera
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