[TRNSYS-users] Chilled ceiling

[David Bradley]

Nguan,
  Your wall type GROUND is set up as a BOUNDARY wall with a constant 
convection coefficient of 11 kJ/h on the inside surface and an 
internally calculated convection coefficient on the back side. The 
convection coefficient for the back (non-zone) side of a BOUNDARY wall 
is usually set as a very small number (0.0001) if the back side surface 
is in direct thermal contact with the boundary temperature (as in the 
case of ground coupling) or to a constant or scheduled value of your 
choosing.
Kind regards,
 David


#TEO NGUAN TECK# wrote:
>
> Hi ALL,
>
>  
>
> I have included chilled ceiling into my model and have encountered an 
> error during simulation.
>
>  
>
> The error message is : */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)!/*
>
>  
>
> Any advice on how to rectify the error? Attached are my files.
>
>  
>
> *Note*: The data used for the chilled ceiling is intended for trial 
> purpose, final values have not been confirmed.
>
>  
>
> More queries on chilled ceiling:
>
> 1)      Are there tutorials available on simulation using active 
> layers and chilled ceiling?
>
> 2)      For simulation using chilled ceiling & active layer, do they 
> handle only the sensible cooling part in TRNSYS? From my 
> understanding, chilled ceilings only handle sensible cooling and 
> external equipment must be used to dehumidify outdoor air.
>
> 3)      Should I model a Dedicated Outdoor Air System (DOAS) to handle 
> the latent cooling or it is not required? [in response to point no. (2)]
>
>  
>
> Any help is deeply appreciated!
>
>  
>
> Nguan Teck
>
> Undergrad
>
> NTU, Singapore
>
> ------------------------------------------------------------------------
>
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>   

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