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Fix COSTT error in pvl_klucher1979.m #14

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Merged
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Aug 20, 2018
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Fix COSTT error in pvl_klucher1979.m #14

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5 changes: 5 additions & 0 deletions pvl_klucher1979.m
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Expand Up @@ -72,9 +72,14 @@
GHI(GHI < 1E-6) = 1E-6; % Prevent division by 0
% Dec 2012: A bug was identified by Rob Andrews (Queens University) in this equation in PV_LIB
% Version 1.0. Fixed in Version 1.1.
% COSTT is cos(angle between sun vector and array normal)
COSTT = cosd(SurfTilt).*cosd(SunZen) + sind(SurfTilt).* ...
sind(SunZen).*cosd(SunAz-SurfAz);

% Aug 2018: Restrict COSTT>=0, so that circumsolar irradiance is not added
% to total sky diffuse when the sun is behind the array
COSTT(COSTT<0) = 0.0;

F = 1 - ((DHI./GHI).^2);
SkyDiffuse = DHI ...
.* (0.5 .* (1 + cosd(SurfTilt))) ...
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