Grasshopper

algorithmic modeling for Rhino

strange irradiation results.

Hello all,

I'm quite new at grasshopper and DIVA.

I am trying some irradiation simulations, for my thesis, on a simple geometry and I am getting some really strange results. The north oriented surface of the roof is getting higher results than expected (for city at north hemisphere), and higher than the south side of the (vertical) roof, (that is abnormal for the latitude).

The expected results should be like that of PVGIS: 

ORIENTATION ANGLE PVGIS DIVA
N 22 649 824
S 22 970 860
FLAT 0 829 867
N 43 504 525
S 43 1020 873
N 90 278 233
S 90 781 707


Can anyone guess the reason, or did anyone face this problem in the past? what do you think I should change?

Attached you may find the .gh file and the climate data file.

Thank you very much for your time.

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Permalink Reply by Jon Sargent on March 30, 2015 at 10:13pm

Looks like you had different numbers of nodes and vectors, and some of the nodes were pointing the wrong way :)

Jon

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Permalink Reply by stergios on March 31, 2015 at 7:03am

Thank you very much for your immediate reply.

It is really useful and now results make sense. :)

Looks like I have to understand enough better some components. ;)

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