[TRNSYS-users] Chilled ceiling
David Bradley
bradley at tess-inc.com
Fri Jan 2 14:13:09 PST 2009
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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Thermal Energy System Specialists (TESS), LLC
David BRADLEY 22 N. Carroll Street - Suite 370
Partner Madison, WI 53703
USA
P: +1.608.274.2577
F: +1.608.278.1475
E-mail: bradley at tess-inc.com
Web Pages: http://www.tess-inc.com and http://www.trnsys.com
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