This function computes the buoyancy-driven convective heat flux as
q̇ = h ΔT,
where ΔT is the solid temperature minus the fluid temperature and h is the convective heat transfer coefficient for a wall, computed as
h=1.3 |ΔT|0.3333.
function wall extends Buildings.HeatTransfer.Convection.Functions.HeatFlux.BaseClasses.PartialHeatFlux; end wall;