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My past post might be helpful.
Each external surface has its own sky view factor (Fsky). φ is the tilt angle of the surface. For vertical wall, cosφ=0, and Fsky≈0.354. For horizontal roof, cosφ=1, and Fsky=1.
The relevant part of Engineering Reference is here.
My past post might be helpful.
Each external surface has its own sky view factor (Fsky). φ is the tilt angle of the surface. For vertical wall, cosφ=0, and Fsky≈0.354. cosφ=0. For horizontal roof, cosφ=1, and Fsky=1.cosφ=1. Each external surface has its own sky view factor (Fsky).
The relevant part of Engineering Reference is here.