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Heat Transfer 247
Figure 10-170. Outside heat-transfer film coefficient as function of pipe temperature and O.D. (Used by permission: Chapman, F. S., and Hol-
land, F. A. Chemical Engineering, Dec. 20, 1965, p. 79. ©McGraw-Hill, Inc. All rights reserved.)
h c convection heat transfer film coefficient,
2
Btu/(hr) (ft )(°F)
h r radiation heat transfer film coefficient, D O.D. of the insulated or bare pipe, whichever is being
2
Btu/(hr) (ft )(°F) studied.
emissivity of the outside surface of insulated or bare A a area of heat transfer between the insulation or bare
pipe pipe and air, ft 2
T a ambient temperature, °F T °R (degrees Rankine)
