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[EnergyPlus_Support] Re: spectral composition of solar radiation

Jean wrote: "When building an ASHRAE designcase window, which I gather is based on obsolete/retracted calculation methods, I have to get the glazing values per European standards here in Germany, and then I switch the rating environmental conditions to NFRC to see the resulting U-Values for use with the simple glazing system in e+, correct?".
I think you are right. Is such a work possible only using the software Windows 6? Do you need to know the exact properties of every layer that compose the window?
I think I have the same experience: if I insert the properties of the different layers of the windows in EnergyPlus (or in DesignBuilder) I get U-values that are greater than the values declared according to European technical standards.
Regards


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Jean marais" <jeannieboef@...> wrote:
>
> I see with Window 6, one can switch standard Thermal Calculations between EN673 and ISO15099, thereof the convection calcs between ISO and other for blinds...but not for optical calcs. However the environmental conditions can be switched between NFRC, CEN and userdefined.
> 
> When building an ASHRAE designcase window, which I gather is based on obsolete/retracted calculation methods, I have to get the glazing values per European standards here in Germany, and then I switch the rating environmental conditions to NFRC to see the resulting U-Values for use with the simple glazing system in e+, correct?
> 
> I noticed this whilst trying to get to standard european u-values such as 1.1 W/m2-K using the glazing database for double pane windows. This was basically imposible using NFRC mode.
> 
> But it seems the spectral weighting remains an open point.
>



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