I have been tasked with finding the heat transfer across a composite wall on Mars.
On the left of the wall there is air maintained at Earth atmospheric conditions and room temperature (101 KPa, $21^\circ C$). On the right there is Martian air, residing at approximately 1 Kpa and $0^\circ C$ perhaps with a light breeze of 4 m/s.
The diving wall is made up of an internal sheet of aluminium, 5cm thick, and a slab of Martian soil 50cm thick.
From left to right, heat enters the wall through convection + radiation, travels through the wall via conduction, and leaves the wall through conduction and radiation. I believe if I can compute R values for each of these, I can combine them in parallel and series to find an overall R coefficient in order to find the power required to maintain the temperature at 21 C.
My struggle is to find the correct R values for convection and radiation, most importantly because I do not know how to find the convective heat transfer coefficients. I have looked through literature but not found anything useful. Any advice?