Re: [TRNSYS-users] Chilled ceiling

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

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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