U P S I D E H E A T F L U X

• About the Heat Transfer Coefficients

See Also

Select a Heat transfer coefficient hu (SI unit: W/(m2·K)) to control the type of convective cooling to model—User defined (the default), External natural convection,

Internal natural convection, External forced convection, or Internal forced convection. If only convective flux is required on the downside, use the default, which sets hu 0.

•For all of the options, enter an External temperature, Text, u (SI unit: K).

•For all of the options (except User defined), follow the individual instructions in the

Heat Flux section described for the Convective Cooling feature, then select an

External fluid—Air, Transformer oil, or water. If Air is selected, also enter an Absolute pressure, pA (SI unit: Pa). The default is 1 atm.

D O W N S I D E H E A T F L U X

The controls in the Downside Heat Flux section are the same as those in the Upside Heat Flux section except that it is applied to the downside instead of the upside.

Out-of-Plane Radiation

Select the Out-of-plane heat transfer check box on the Heat Transfer

1D

interface to add this feature to 1D and 2D models.

2D

The Out-of-Plane Radiation feature models surface-to-ambient radiation on the upside and downside and adds the following contribution to the right hand side of Equation 13-7 or Equation 13-8:

O U T - O F - P L A N E H E A T TR A N S F E R F E A T U R E S | 431