In these relations, q ·
0 is the specified heat flux in W/m2, h is the convection
coefficient, hcombined is the combined convection and radiation coefficient, T is
the temperature of the surrounding medium, Tsurr is the temperature of the
surrounding surfaces, is the emissivity of the surface, and
is the Stefan–
Boltzman constant. The relations above can also be used for node M on the
right boundary by replacing the subscript “0” by “M” and the subscript “1” by
“M 1”.