Re: [TRNSYS-users] (no subject)

[David Bradley <bradley@tess-inc.com>]

Sek,
 There is a feature in TRNBuild that allows you to have Type56 automatically calculate a natural convection heat transfer coefficient for interior floors, walls, and ceilings. You select this option when you are defining the wall and its layers. The assumption is that external surfaces (surfaces on the outside of the building) are governed by forced convection, not natural convection and so if Type56 encounters an outside surface that has the "internal calculation" option selected for the convective heat transfer coefficient calculation method, it generates an error. What you need to do is look for surface 5 in your building (the surface number is displayed next to the "geosurf" field for each wall in the zone view), then check what wall type has been selected for that surface, and make sure that the "back side" convective heat transfer coefficient is set to "user defined" and not to "internal calculation"
Best,
 David


#SEK JUN-YANG# wrote:

Dear All,

 

During my simulation I have encountered an error message that reads: Error in automatic heat transfer calculation for surface 5 or its adjacent surface. Automatic heat transfer calculation is only allowed on surfaces within a zone. Please check building input file (.bui). Please advice. Thank you.

 

Best Regards,

Sek Jun-Yang

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