[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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

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@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

 


_______________________________________________
TRNSYS-users mailing list
TRNSYS-users@cae.wisc.edu
https://mailman.cae.wisc.edu/listinfo/trnsys-users


-- 
***************************
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@tess-inc.com

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