[TRNSYS-users] Irradiance/Illuminance calculations in TRNSYS

[David BRADLEY]

Caroline,
   The answer depends a bit on which weather reading/processing 
component you are using. If you are using Type15 and are reading TMY2 
and TMY3 files then the component outputs the following (read from the 
data) in the following units:

Global horizontal illuminance (lux)
Direct normal illuminance (lux)
Diffuse illuminance on horizontal (lux)
Zenith luminance (cd/m2)

   This assumes that Type15 is reading a full TMY2 or TMY3 format file. 
If the data in the file is in some non standard units or if the 
illuminance and luminance data fields are blank (or more likely set to 
some default value to indicate that the data isn't present) then the 
Type15 outputs won't be valid.
Kind regards,
  David




On 11/13/2013 05:25, Caroline Paradise wrote:
> It has been suggested to me that I can extract illuminance data from 
> TRNSYS using the weather data that is stored within the software but 
> I'm not sure of the exact data I've now got. A calculation has been 
> run for Helsisnki for example and the output was 168 hours worth of 
> data which by the looks of things is in watts/m2 although it can't 
> seem to find an explanation of what I'm looking at in the programme 
> documentation. I am interested in data from across the year so I was 
> also wondering how I might be able to get more data. Any support with 
> this would be much appreciated.
> Regards,
>
> Caroline
>
>
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> TRNSYS-users at cae.wisc.edu
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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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