Re: [EnergyPlus_Support] Calculating Direct Normal Radiation

["Michael J. Witte" <mjwitte@xxxxxxxx>]

The hour in an EnergyPlus weather file (epw) is standard clock (legal) time at 
the specified longitude and time zone.  It is not adjusted for daylight savings 
or "summer" time.

Illuminance for daylighting is calculated within EnergyPlus based on the direct 
normal, diffuse horizontal, and present weather (2 fields) in the weather file 
using models described in the Engineering Reference.

Mike


On 18 Feb 2008 at 12:30, Nuno Costa Brandão  wrote:

> Dear All,
> 
> I´m calculating the component "Direct Normal Radiation" for my weather
> file. Although EnergyPlus can calculate it, I would like to compare
> the value with collected data and make a hand calculation just to be
> close in understanding this process calculation.
> 
> The component ""Hour" described in "Data File Description" from the
> "Auxiliary Manual" within the Weather Converter calculations, stands
> for  "Legal Real Time" our "Real Solar Time"? I need to know this so I
> can compute correctly the solar height.
> 
> In the "Auxiliary Manual" the "Illuminance" variable values are
> described as a "not use" variable in EnergyPlus calculations. What I
> would like to know is, if the software really takes into account this
> values in "Daylight" calculations. I have them to include in the
> weather file but I´m not sure if they are needed. 
> 
> Thanks for help
> Nuno 
> 
> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
> 
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
> 
> Attachments are not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
> 
> EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the
> Documentation link and press the "search" button.
> 
> Yahoo! Groups Links
> 
> 
> 
> 


========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx



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Attachments are not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
 
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