[EnergyPlus_Support] Earth tube model

[Dusko Nikolic <dulen@xxxxxxxxxx>]

I can't figure out what is b in equation for average soil surface 
temperature Tm. Have a look at attached pdf

Also there is cos(FI)I  and  sin(FI)I    (FI is instead of capital greek 
fi. can't get symbol font in email. :))

there is explanation for (FI)S -> phase angle difference between the air 
and soil surface temperature
and (fi)I -> phase angle between the insolation and the air temperature

but what is (FI)I?

Thanks


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Attachment not found:
d:\eudora\attach\Earth tube.pdf