Re: [TRNSYS-users] sloping surfaces

[Adrien JEZEQUEL - ITF <a.jezequel@itf.biz>]

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 back sides 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@tess-inc.com]
Gesendet: Mittwoch, 20. Juli 2011 19:12
An: Marcus.Joppich
Cc: trnsys-users@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

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