[TRNSYS-users] sloping surfaces

Thu Jul 21 06:21:31 PDT 2011

Dear Marcus,

The error you get with automatic heat transfer calculation is not linked 
with your orientation definition and connection with type56, which seems 
to be fine.

This is due to an external wall or window in Type56, which have its 
convective heat transfer coefficient calculated automaticaly on its back 
side.

To deal with that issue, check all of your wall defintion in Wall type 
manager and be sure that convective heat transfer coefficient of 
backsides of your exernal wall are not defined as automatic.

Best regards
------------------------------------------------------------------------
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Le 21/07/2011 15:01, Marcus.Joppich a écrit :
>
> Hello David,
>
> thank you for your answer. I´ve tried it. The following steps were 
> performed:
>
> I defined 6 orientations of walls to external: Northwest (Wall to 
> external)/ Southeast (Wall to external)/ Northeast (Wall to external)/ 
> Northwest with a slope of 37 degrees (sloping roof)/ Southeast with a 
> slope of 37 degrees (sloping roof)/ Northeast with a slope of 37 
> degrees (sloping roof).
>
> At Type109 I defined 6 surfaces with the following parameters:
>
> Surface1/Slope of surface 0/Azimuth of surface 225
>
> Surface2/Slope of surface 0/Azimuth of surface 135
>
> Surface3/Slope of surface 0/Azimuth of surface 315
>
> Surface4/Slope of surface 37/Azimuth of surface 225
>
> Surface5/Slope of surface 37/Azimuth of surface 135
>
> Surface6/Slope of surface 37/Azimuth of surface 315
>
> Then I connected the outputs with the inputs by Type56.
>
> Is it the right way?
>
> I get a fatal error: "Error in automatic heat transfer calculation  
> for surface   1 or its adjacent surface!: Automatic heat transfer 
> calculation is only allowed on surfaces within a zone.  Please check 
> building input file (.bui)", but I think it has a different reason.
>
> Thank you for your help.
>
> Regards, Marcus
>
> *Von:*David BRADLEY [mailto:d.bradley at tess-inc.com]
> *Gesendet:* Mittwoch, 20. Juli 2011 19:12
> *An:* Marcus.Joppich
> *Cc:* trnsys-users at cae.wisc.edu
> *Betreff:* Re: [TRNSYS-users] sloping surfaces
>
> Marcus,
>  It depends somewhat on what component you are using to model the 
> attic. However, almost without exception, you need to define the slope 
> and azimuth of the attic roof surfaces in your weather component 
> (Type15 probably) and then pass the appropriate solar radiation 
> outputs from that component to the appropriate inputs of your building 
> component.
> Regards,
>  David
>
>
> On 7/20/2011 06:57, Marcus.Joppich wrote:
>
> Hello TRNSYS-users,
>
> I try to simulate few rooms in an attic. I don´t understand how I can 
> describe a sloping surface (like a sloping roof) with TRNSYS. Maybe 
> you can help me.
>
> Thanks for your time.
>
> Marcus
>
>   
>   
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>
>
>
> -- 
> ***************************
> David BRADLEY
> Principal
> Thermal Energy Systems Specialists, LLC
> 22 North Carroll Street - suite 370
> Madison, WI  53703 USA
>   
> P:+1.608.274.2577
> F:+1.608.278.1475
> d.bradley at tess-inc.com  <mailto:d.bradley at tess-inc.com>
>   
> http://www.tess-inc.com
> http://www.trnsys.com
>
>
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