Re: [EnergyPlus_Support] Daylighting

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

I would recommend modeling each geometric zone as a thermal zone in EnergyPlus. 
 You need to describe all of the wall surfaces anyway, so there is little to be 
saved by making thermal zones with 3 rooms each.  In fact the coordinates for 
the surfaces will be easier to enter if the zones are all just a single room.  

Use Relative coordinates, describe one of the 12 rooms, then use a text editor 
to copy/paste the zone surface descriptions.  Simply change the zone origins in 
the remaining 11 zones and the work is finished.  With 12 zones, you can then 
see the daylighting control output for each zone individually.

Regarding the design lighting level, EnergyPlus does not simulate the 
artificial lighting fixtures.  EnergyPlus only models the illuminance levels 
from daylighting.  It assumes that the LIGHTS objects in the zone are adequate 
to provide the desired illuminance when daylighting is unavailable.  It is up 
to the user to determine the required LIGHTS design power level.

Mike


On 24 Feb 2006 at 10:14, dademarino wrote:

> Dear users Of EnergyPlus,
> 
> I'm using EnergyPlus daylighting model without thermal analysis,plant 
> and system. So I have divided the building in simple geometric and 
> not thermal zones.  I make a simple daylighting analysis only for 
> some zones to estimate the consumptions electrical workers for the 
> inner lighting system and to propose solutions in order to reduce the 
> consumptions
>  
> My problem is:
> I have a daylit zone with a group of 12 equal rooms but the windows 
> in the zone are shadowed by exeterior obstructions like trees and 
> other parts of building. In this Way I can't use zone multipliers.The 
> solution is:
> 
> 1. to describe each room as a separate geometric zone (as written in 
> input output reference but only for thermal and not geometric zone 
> such as my project)
> 
> or 
> 
> 2. to divide these 12 rooms in four similar geometric zones  about 
> shadows from external objects  (each zone with 3 rooms).
> 
> About the second option:  Is design level (Watt) installed in the 
> centre of the ceiling of each equal room or in the centre of the 
> ceiling of zone?In each group of zones Can I define two reference 
> points in two different rooms?
> 
> Thanks in advance,
> 
> Marino Davide.
> 
> 
> 
> 
> 
> 
> 
> The primary EnergyPlus web site is found at:
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> 
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> 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.idf 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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