Hi Beatriz! Hi David!
Probably I don't understand the question... I'm
simulating a building with an underground cellar simply using type56 multizone
model. In PREBID in fact is possible to define walls with boundary
condition; the userdefined temperature of the boundary allows to create an input
of type 56 to link with the outputs of type501 ground temperature model (with
calculates Tsoil(z,t) according to the ASHRAE). In this way simulation
looks like run with good results.
Kind regards
Maurizio
Sorce
Department of Energy and
Environmental Research (DREAM) Università degli Studi di
Palermo
----- Original Message -----
Sent: Thursday, March 04, 2004 3:23
PM
Subject: Re: underground structures
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
---------------------
**************************************************************************************** Thermal
Energy System Specialists (TESS) David
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and http://www.trnsys.com
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