Converts the shading signal to be strictly bigger than 0 and smaller than 1
This model changes the shading control signal to avoid a singularity
in the window model if the input signal is zero or one.
Since the window heat balance multiplies the area of the window by u
or by 1-u (if a shade is present), the heat balance can be singular
for u=0 or for u=1.
This model avoids this singularity by slightly changing the control signal.
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October 28 2010, by Michael Wetter:
First implementation.
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.Buildings.HeatTransfer.Windows.BaseClasses.ShadingSignal