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

[王菊花]

Dear Achim,

 

   I  accept that  higher cooling loads for a double skin facade as opposed to a single skin facade with external blind is normal.But I  compared cooling load in summer with external respiration double skin facade as opposed to a single skin facade for the south wall.Because of natural ventilation by thermal pressure between the airgap and environment,it is expected that cooling load with external respiration double skin facade is smaller,Assuming they have equivalent shading effect.Right?Thank you for your answers.Daisy.

 

 

 

 





CC: esp-r at lists.strath.ac.uk
From: achim.geissler at intergga.ch
To: luckygrass100 at hotmail.com
Subject: Re: [esp-r] boundary conditions for nonsymmetric constructions
Date: Wed, 28 Apr 2010 22:28:10 +0200

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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