[Equest-users] Normal and Horizontal Solar Radiation - Convertion weather from EPW to BIN

[Joe Huang]

What solar parameters are you comparing?  EPW contains extraterrestrial 
total horizontal, extraterrestrial direct normal, total horizontal, 
direct normal, and diffuse horizontal.  BIN contains total horizontal, 
and direct normal only.  The extraterrestrial values are not used in 
building simulations, and diffuse horizontal can be calculated as (total 
horizontal - direct normal * sin (solar angle) ).  Therefore, as far as 
simulation programs go, all use the same basic data. There should be no 
difference except for round-off errors between the total global 
horizontal and direct normal between EPW and BINM.

Joe
Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 108D
Moraga CA 94556
yjhuang at whiteboxtechnologies.com
http://weather.whiteboxtechnologies.com
http://www.whiteboxtechnologies.com
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"

On 5/28/2013 3:56 PM, Dante Garcia wrote:
>
> Good morning,
>
> I have tried to find some differences that I have when I converted 
> from .EPW to .BIN using eQ-WFC (Weather File Conversion). And I found 
> a difference in the Solar Radiation.
>
> I don't know why this software create Normal and Horizontal Solar 
> Radiation Data?, and How it influence in results?
>
> Also, is there any other way to have Lima Weather file?
>
> Thanks you,
>
> P.S.: Temperature and Wind are equal in both, converted data and 
> original data.
>
> *Dante Garcia | LEED Green Associate*
>
>
>
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