Re: underground structures

[David Bradley <bradley@xxxxxxxxxxxx>]

Beatriz,
  My apologies for delaying so long in answering you. There are a
number of ways that you can handle ground coupling in TRNSYS, some built
into the program and others as separate models. We developed a set of six
ground coupling models to which I think you are referring. In all cases,
the models define the slab (or slab and walls in the case of the basement
model) and define a 3D volume of soil surrounding the slab. This so
called "near field" is divided up into nodes and extends away
from and below the slab or basement. Because the user is asked to define
the size of the nodes, the near field can be as large or as small as you
would like. Beyond the near field is the "far field." The
models assume that the far field soil is not affected by heat transfer
from the near field but that the near field may be influenced by the
conditions in the far field. Essentially the far field is an infinite
energy source/sink. The models all perform a 3D conduction problem to
balance energy in the near field at each time step.

The six models are broken down into three pairs of models. The first pair
of models is for simple slab on grade. The second pair is for slab in
grade (soil surrounds the perimeter of the slab) and allows the user to
define any number of fluid filled pipes that may travel through the slab
or through the surrounding near field. The user also defines the path
that the pipes follow. The third pair of models is for basement modeling
in which there is not only a slab but also four walls. 

Within each pair of models, one is designed to interface with the Type56
building model and one is designed to interface with simplified zone
models that do not contain the concept of a boundary wall, which do not
perform internal radiation exchange calculations but which do provide the
user with a zone air temperature. I will send you a second email with a
document that contains the General Description for each of the six models
(I don't want to annoy everyone with the document). If anyone else would
like a copy, please let me know and I will be happy to send it.

Kind regards,
  David

    

At 11:09 AM 3/2/2004 +0100, you wrote:

> Dear
> TRNSYS users:
>
>  
>
> I am a PhD student at the Bioclimatic
> Architecture at CIEMAT, Spain. Now I am studying the thermal behaviour of
> underground wine cellars in Spain and I would like to simulate these
> buildings in TRNSYS.
>
>  
>
> I have seen that there is a Basement
> Model (Type 56 Mode) which could be valuable for my research. I would be
> very grateful if you could send me more information about this module, as
> well as any other module or information related to earth-sheltered or
> underground structures.
>
>  
>
> In addition I would be interested in
> get information about the module: Slab on Grade (Type 56 mode) and
> (Simple Zone Mode) in order to simulate above ground buildings.
>
>  
>
> Thank you in advance, Beatriz.
>
>  
>
> -----------------------------
>
> Beatriz Porcar Laynez
>
> Bioclimatic Architecture
> Program
>
> Renewable Energy 
> Department
>
> CIEMAT
>
> mailto:
> beatriz.porcar@xxxxxxxxx
>
> Phone: (+34) 913466344
>
> ---------------------
>
>

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Thermal Energy System Specialists (TESS)
David BRADLEY                           2916 Marketplace Drive - Suite 104
Partner                                        Madison, WI 53719
Phone: (608) 274-2577 USA
Fax: (608) 278-1475
E-mail: bradley@xxxxxxxxxxxx
Web Pages:  http://www.tess-inc.com     and      http://www.trnsys.com

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