Consider a horizontal flat roof section having the same dimensions as a vertical wall section. For both sections, the surfaces exposed to the air gap are at 18°C (inside) and -10°C (outside).
(a) Estimate the ratio of the convection heat rate for the horizontal section to that of the vertical section.
(b) What effect will inserting a baffle at the mid-height of the vertical section have on the convection heat rate for that section?