[esp-r] Re: boundary conditions for nonsymmetric constructions

[Achim Geissler]

Dear Daisy

higher cooling loads for a double skin facade as opposed to a single  
skin facade with external blind is to be expected. The facade air gap  
will usually have higher temperatures than ambient. Thus, conduction  
is increased.

Best
Achim

On Apr 28, 2010, at 4:24 PM, 王菊花 wrote:

> When I define the boundary conditions which apply to each surface in  
> the model by selecting check via vertex contiguity facility.It scans  
> the polygons of a model looking for surfaces in
> various zones which are close matches
> in terms of shape and position.After that,I began to take the action  
> simulation.It warned that Surface X has a nonsymmetric construction  
> interior.It faces Y  which is composed of interior (which may not  
> match).Here,X and Y are surfaces matching in terms of shape and  
> position.They are the same surface actually separating two adjacent  
> zones.They just have opposite directions for the two zones.And  
> interioris the name of construction defined by myself.I wonder  
> whether the warnings affect simulation results?
> I am simulating thermal performance of external respiration double  
> skin facade.I built zones for airgap between the two curtain  
> walls.But it turned out that cooling load in summer with double skin  
> facade for south wall is bigger than cooling load with single skin  
> facade for south wall.I can't explain this.I am thinking whether It  
> is caused by the wrong surface connections &boundary conditions  
> described above?
> I am expecting your kind answers.Thank you in advance!Daisy.
>
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achim.geissler at intergga.ch




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