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Re: [EnergyPlus_Support] Irradiance


First,

   The person who can really answer this question has left the team (Fred W 
retired in July 2004).  We have no replacement person yet -- so from 
looking at the code,  I will try my best.

At 09:44 AM 4/7/2005, Peter G. Loutzenhiser wrote:
>When EnergyPlus performs these calculations, does it
>interpolate (linear or otherwise)the coefficients provided in Table 16 (from
>the Perez Model) or does just use limits and choose the values that 
>correspoint
>to Epsilon?

It does not interpolate.

>  Also, as I look at the original paper (Perez et al., 1990)--does
>Ih represent diffuse horizontal irradiance or global horizontal irradiance?

I do not have a copy of the original paper.    From the Engineering 
Documentation, it appears the Ih is "horizontal solar irradiance" -- but I 
infer from the section "Sky Diffuse Solar Radiation on a Tilted Surface" 
and from the code that we are talking about diffuse irradiance and not 
global for this instance.


Linda

EnergyPlus WebSite: http://www.energyplus.gov
Owner: EnergyPlus_Support list
Member: EnergyPlus Development Team



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