Dear TRNSYS Users,
When I want to simulate a building, the biggest difficulty is to take into
account the good insolation. For a big building with a lot of balconies,
it's impossible to be accurate in calculation of shading masks, without
using hundreds of type 34. So we have to simplify the phenomena.
I find a new problem (for me) with Type 34 : I simulate a building without
any overhang and wingwall and I find a certain quantity of Qheat = Qheat1
(for example). I want to test wingwall, so I add a type34. At first, I test
a type 34 with all overhang and wingwall lengths equal to 0. The problem is
that I don't find the same quantity of Qheat (Qheat2) for my building.
Qheat1 is bigger than Qheat2.
To refind the same Qheat in the 2 cases, I have to change the Sky Model for
diffuse radiation in the type 109 Wheather data, from the Perez Model to
the Isotropic sky model.
So, what should I think about that ? What is the impact of the Isotropic
sky model on the accuracy of a building simulation ? Is there a way to keep
the Perez Model and to refind the same Qheat in the 2 cases (with and
without type34).
Thanks for your help.
Christophe.
===========================
ENERTECH
F-26160 FELINES SUR RIMANDOULE
tel-fax : 04 75 90 18 54
Email : sidler@club-internet.fr
Web : http://sidler.club.fr
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