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[EnergyPlus_Support] High Mean Air Temperature in Winter

Hello.

I am trying to model the Living zone of a single storey residential 
building. It is a 5m(X) x 3.6m(Y) x 3.75m(Z) space, with 6.8m2 South 
Window and 1.2m2 West Window, without space heat gain, purchased air 
heating and cooling.
Weather data used is JAPAN_Osaka_IWEC.epw. 

During Winter, the Living Zone MAT gets so high (i.e. 2,4,7,9,10 Jan 
above 30C; 5,6,8 Jan above 25C) that purchased air heating does not 
need to function. As the MAT for Summer during period without cooling 
is around 35C, I wonder how the Winter MAT becomes so high. 

A rough comparison of Zone Transmitted Solar shows it is at least 2 or 
3 times the sum of Direct and Diffuse Solar in Winter, but about the 
same with sum of Direct and Diffuse Solar in Summer. I could not find 
the explanation of how Solar Radiation Transmission through Windows is 
calculated in the Engineering Doc thus just comparing directly though 
they are of different units.

I have uploaded the idf file: HighMeanAirTempInWinter.

Please advice.

Thank you.

Wah







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