[EnergyPlus_Support] Question about sky temperature and Horizontal Infrared Radiation?

["yhleifei" <yhleifei@xxxxxxxxxxxx>]

Thank Mark Carey and dbcrawley for your help about my question "which 
items is useful in weather data for hvac ? ".
I had another question about sky temperature and Horizontal Infrared 
Radiation Intensity from Sky.
There is an equation at InputOutputReference Page57 : 
sky temperature=(Horizontal IR/sigma)**0.25-273.15 
My question : Could the sky temperature be calculated from the data 
of "Horizontal Infrared Radiation Intensity from Sky {Wh/m2}" in 
weather file ,according the equation?  "Horizontal Infrared Radiation 
Intensity from Sky {Wh/m2}" in weather file be calculated from the 
data of sky temperature ,according the equation? 
I had modifyed a .epw file (CHN_Wuhan_CSWD.epw) ,set the data 
of "Horizontal Infrared Radiation Intensity from Sky {Wh/m2}" in 
weather file as 0,10,100,200,300. 
And i output the "sky temperature ". When i run a case (case600.idf), 
the "Environment:Sky Temperature [C](Hourly)" is -1,-98,-101,-43,-13.
What wrong ?
Case600.idf is for "EnergyPlus Testing with Building Thermal Envelope 
and Fabric Load Tests from ANSI/ASHRAE Standard 140-2004".

Regards
Lei Fei
 


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