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Dear TRNSYS-Users,
if you use Type 56
without TRNflow, a constant value for the air density is used as written in
PROPERTIES.
If you use TRNFLOW, the air
density is temperature depended including the calculated mass flows.
Marion
Dipl.-Ing.
Marion Hiller
TRANSSOLAR:
KlimaEngineering - Technologien für energieeffizientes Bauen und Nutzerkomfort
in Gebäude
Munich - New York - Stuttgart + 49.711.67976.0
Transsolar
Energietechnik GmbH, Curiestrasse 2, 70563 Stuttgart
Amtsgericht Stuttgart - HRB 23347, Steuernummer 99073/00911, USt-IdNr.:
DE152272639
Geschäftsführer:
Dipl.Ing. Matthias Schuler, Dipl.Ing. Thomas Auer,
Dipl.Phys. Stefan Holst, Prof.
Dipl.-Ing. Bleicher
Von: Mohamed Ayman
[mailto:ayman.mohamed@aalto.fi]
Gesendet: Mittwoch, 2. November
2011 12:19
An: 王洋; trnsys-users@cae.wisc.edu
Betreff: Re: [TRNSYS-users] air
Density in TRNBuild
Hi Wang
The air density changes
with temperature in Trnbuild.
Best Regards
Ayman Mohamed
From:
trnsys-users-bounces@cae.wisc.edu
[mailto:trnsys-users-bounces@cae.wisc.edu]
On Behalf Of ??
Sent: Wednesday, November 02, 2011
1:14 PM
To: trnsys-users@cae.wisc.edu
Subject: [TRNSYS-users] air
Density in TRNBuild
Which experts can tell me a question about air density?
In TRNbuild PROPERTIES
about air density 1.2 kg/m^3: Is it a initial value? If outdoor temperature
changes in TrnFlow, this air density value will change as the teperature or it
is a constant?
2011/11/1 <trnsys-users-request@cae.wisc.edu>
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Today's Topics:
1. Re: Information (David BRADLEY)
---------- 已转发邮件 ----------
From: David BRADLEY
<d.bradley@tess-inc.com>
To: "Adriana Gómez
Aldana" <adrigomezaldana@gmail.com>
Date: Tue, 01 Nov 2011 11:35:52 -0500
Subject: Re: [TRNSYS-users]
Information
Adriana,
I had thought that I sent
a response about this. In case it did not get to you, here it is again:
...
It would help to know a bit more about the configuration of your
system: what are you drying, is the material in a big lump, is it spread out on
shelves, is it moving, does it occupy most of the available space in the
chamber or a comparatively small part of the space, etc.)
I think you could probably use the Type56 multi-zone building model
for the drying chamber itself.
I would guess that you would need to write a new model for the
material that you are drying. If the material is quite spread-out then this
might be easily enough characterized by a first-order differential equation and
you even might be able to use Tess Type693. Type693 is intended to model a
thermal lumped capacitance that heats and cools according to a first-order
differential equation but I imagine that pricipals are basically the same
whether you are talking about thermal capacitance or moisture capacitance.
If the product is not spread out, if important moisture gradients
develop within it as it dries, or if its drying process is exothermic (like it
is for compost) then I think you would need to write your own model or
collaborate with someone who could write the model for you. In order to write
the model you would need to have access to a FORTRAN compiler such as Intel
Visual Fortran v11.x
Once you have the model of the drying substance, you would connect its
moisture loss to a moisture gain input of the building (drying chamber) model.
Kind regards,
David
On 10/30/2011 20:45, Adriana Gómez
Aldana wrote:
I am a TRNSYS user since it
is one of the tools for my phD thesis. Currently, I am working in a solar
drying problem and I would like to know if there is a special module to
simulate the drying chamber. If it is possible to acquire this module, I would
be very thankful if you can explain me how is the procedure to access it.
Thanks for your attention,
phD Student - Engineering
Department
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--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
P:+1.608.274.2577
F:+1.608.278.1475
d.bradley@tess-inc.com
http://www.tess-inc.com
http://www.trnsys.com
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