Re:Re:Re: [EnergyPlus_Support] A question about the center-of-glass conductance

[wanglei <wangleihello@xxxxxxx>]

Dear Linda
 
 
    Now I create a single zone model with a south window without Frame and Divide. The window area is 4.5m2.
 
According to the ASHARE winter conditions, I create a HeatDesign Day: 
The outside temperature is -17.8C
The wind speed is 6.71m/s  
 
The indoor temperature is 21.
 
After calculating, the Window Heat Loss is 490.7W ; the Ext Convection Coeff is 23.68W/m2-K; the Int Convection Coeff is 3.076W/m2-K.
 
I use the formula  k=Q/(tin -tout)/A to calculate the window u value
 
The result is 2.8 W/m2-K. In eio file, this value is 3.785 W/m2-K
 
Could you tell me why these two value isn't equal
 
Thank you
 
Lei wang
 
 
 
 

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