[Ahmedelkiki]

Please I am working on simulation of solar still I wanted to add a solar radiation so I used solar loading and used solar ray tracing and used solar calculator to define my sun direction vector instead of entering it manually the direct and diffused beam I know their values so I define them as constant value for that certain hour so I only use the solar calculator to compute the sun direction vector
My problem is that the sun rays seems to be under the solar still not above it so I want to learn If anyone knows how to probably define the sun direction vector from a certain correlation or from the solar calculator it seems I doesn't understand the mesh orientation how to define it
Thanks