bf = projected frame length
U'f = Frame U-factor with calibration panel inserted (use frame tag on indoor frame surfaces in THERM)
U'p = Calibration panel U-factor 190 mm from sightline (use edge tag on indoor calibration panel surface 190 mm from sightline in THERM).
Up = 1-D Calibration panel U-factor (can be calculated by using center of glass tag on indoor calibration panel surface starting at 190 mm from sightline and approximately 1 mm high in THERM)
bp = Calibration panel length for 2-D heat transfer effects (fixed at 190 mm by ISO/CEN 10077)
Lf2D = heat flow through entire cross section incorporating calibration panel (as defined in ISO/CEN 10077)
UCENf = frame U-factor as defined in ISO/CEN 10077
Uf = NFRC type U-factors (frame tag on indoor frame surfaces when the IGU is inserted)
Ueog = Edge of glass U-Factor (Edge tag on indoor side 190 mm from sightline)
bg = Height of the edge-of-glass
Ug = 1-D IGU U-factor (center of glass U-factor) - Take from COG spreadsheet
LY2D = heat flow through entire cross section incorporating IGU (as defined in ISO/CEN 10077)
Y = Linear thermal transmittance
lY = Perimeter length of the sightline