[TRNSYS-users] MULTIZONE BUILDING - SHADING RATIO OF A WINDOW IS LARGER THAN 1 OR LESS THAN 0

[Manfred Schindler]

Hallo everyone,

 

I’m having a problem with the simulation of my 45-zone-model – at timestep
8,75 (0,25 h steps) the error message(s) “MULTIZONE BUILDING - SHADING RATIO
OF A WINDOW IS LARGER THAN 1 OR LESS THAN 0” appears. 

 

For all my windows I have an external shading which is an input from dck.
But I don’t have a separate equation per window. I simplified the
orientations to N-E-S-W have these orientations for each zone à means
4x45=180 shading equations. I checked the equations and the printed values –
are correct – and also set it to constant 0 – still the error messages. 

 

In an existing conversation from the archieve (“2nd error generating
shading/insolation matrix ->  too many shaders on projection plane”) the
problem was solved by adding MIN and MAX function to the shading equations –
with this addition also the iterations in-between, not just the last
iteration, have to be between 0 and 1. But I tried it and it didn’t help.

In the same conversation a previous error was solved by reducing the surface
numbers, because the surface numbers were higher than 999 à could this be
the problem? I have a quite big building with almost 1700 surfaces,
especially a lot of single windows. I could simplify the windows and combine
them per wall-surface to one big window, but I want to check your expertise
first.

 

Kind regards,

Manfred Schindler

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