[TRNSYS-users] Solar azimuth angle in the south hemisphere

[David BRADLEY]

Héloïse,
   We recommend against using Type109 and instead using Type15. Type15 
was freely available (as a different Type number) for Trnsys16 as well. 
However, I believe that all of the TRNSYS solar radiation processing 
components use the same sign convention:

facing toward the equator (so facing south in the northern hemisphere or 
facing north in the southern hemisphere) = 0
facing away from the equator (so facing north in the northern hemisphere 
or facing south in the southern hemisphere) = +/- 180
facing east = -90
facing west = 90.

so your calculation is correct.
Kind regards,
  David



On 3/14/2011 10:16, Heloise PELEN wrote:
>
> Dear TRNSYS users,
>
> We have a project in the south hemisphere but we are more used to 
> model projects in the north hemisphere.
>
> I have a question about which Azimuth Angle I should take to model the 
> building's orientations.
>
> The Type 109 description read as follow : "The solar azimuth angle is 
> the angle between the local meridian and the projection of the line of 
> sight of the sun onto the horizontal plane. 0  = Facing equator, 90 = 
> Facing west, 180 = Facing north, 270 = Facing east. Refer to the 
> manual for details on the azimuth parameter for tracking surfaces."
>
> In our case, "facing equator" is north, so should the solar azimuth 
> angle be 0 ?
>
> We think we should take the following :
>
> North = 0
>
> South = 180
>
> West = 90
>
> East = -90 or 270
>
> Could you confirm this or correct me if I am wrong ?
>
> Thanks very much !
>
> Regards,
>
> *Héloïse Pelen*
>
> *ETAMINE*
>
> *etamine_mail*
>
> 	
>
> heloise.pelen at etamine.coop <mailto:heloise.pelen at etamine.coop>
>
> 75 rue de la Villette - 69003 Lyon
>
> Std : 04 37 45 34 20 / Fax : 04 37 45 41 38
>
> Ld : 04 37 45 34 13 / Port : 06 65 07 41 77
>
> 	
>
> www.etamine.coop
>
>
> _______________________________________________
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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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