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Re: sensitivity analysis with GenOpt
Dear all
You might want to consider using GenOpt for parametric studies (too). GenOpt
is available from LBL (http://SimulationResearch.lbl.gov)
and may be used for both optimization and sensitivity analysis. It is not
easy to get into it, but once you are familiar with GenOpt you may take advantage
of the many features it offers.
In order to gather results and parameters used from subsequent TRNSYS simulations
in the same file, I have written a primitive type (type180). (GenOpt does
that too, but using type180 provides a bit more flexibility). If anyone is
interested in using this little helper, it is attached (type180.for is the
code and type180.for is some explanation and an extract from the deck that
illustrates the use of the type.) Because it was not my intention to distribute
it, it was not developed to perfection. The feature that is most obviously
lacking is mentioned in file "type180.dck".
Peter
--
Peter Vogelsanger
Systemtechnik und Speicher, Institut für Solartechnik SPF
Hochschule für Technik Rapperswil, Oberseestr.10, CH-8640 Rapperswil
Tel +41 55 222 48 23, Fax +41 55 222 48 44, http://www.solarenergy.ch
Richard Heimrath schrieb:
Hello Jeroen,
here a method for starting trnsys in low priority.
I am using a simple dos-batch-file for starting the simulation.
copy "E:\coolsan\iisibat\bregenz\VAR06\lhb_Var70.dck"
"run.dck"
start /belownormal
/wait C:\trnsys15\trnsys.exe
run.dck /N
copy "E:\coolsan\temp\tair.out" "E:\coolsan\results\VAR06\tair_70.out"
The commando start
can be used with a lot of options and in win xp its possible
to set an priority class for the process (/belownormal /low /high...).
With sunny regards,
Richard
At 03:41 PM 5/4/2004, you wrote:
Hello,
I'm doing sensitivity analysises in the same way as Hilde (with Matlab),
if you want an example of the matlab-file, I can send it to you, Beatriz.
But I also ran into a problem:
I want to use my data-files from type 25 as an input in my next run of trnsys,
but there is always a header line in the type25-files. This data file is
8760 houres, i.e. one year long. I don't have any problems when my simulation
is one year aswell; I just let the data reader skip the first line. But when
I want to run more years in a row, the data reader doesn't skip the first
row anymore and an error is produced.
Does somebody know how I can get rid of the header line in trnsys ? or how
to skip the header line when the second year is started ?
And something else, does somebody know how to put TRNSYS the whole in time
in low priority, i.e. before it starts running ? Everytime it restarts for
the analysis, I have to open the task manager and do it again.
Best regards,
Jeroen
Hilde Breesch wrote:
Dear Beatriz,
I'm working on a sensitivity analysis
too (to identify which parameters have the greatest impact on thermal summer
comfort in a building that is cooled by natural night cooling). I control
the simulation process in Matlab to prepare the input files for Prebid and
Trnsys and to run these programs too.
to run Prebid from an other program:
rename prebid.exe bid.exe and use command line:
\Trnsys15\prebid\bid.exe name_of_file.bui
to run Trnsys:
\Trnsys15\\trnsys.exe name_of_file.dck /n
If you have more questions, you can
send me an e-mail directly.
best regards,
Hilde Breesch
PhD student Buildings & Climatic Control
Ghent University, Department of Architecture & Urban Planning
Plateaustraat 22, B-9000 GENT
tel. +32 9 264 78 61 fax. +32 9 264 41 85
e-mail: Hilde.Breesch@xxxxxxxx
http://allserv.ugent.be/~hbreesch/research
----- Original Message
-----
From: Beatriz Porcar Laynez
To: trnsys@xxxxxxxxxxxxxxxxxxx
Sent: Monday, May 03, 2004 4:01 PM
Subject: sensitivity analysis
Dear TRNSYS users,
I am trying to perform a sensitivity
analysis to identify the parameter to which indoor air Tª is most sensitive.
I am specially interested in a number of particular parameters. Is there
any capability implemented in TRNSYS, which could help to develop this kind
of analysis.
Thanks a lot in advance.
Best regards, Beatriz.
-----------------------------
Beatriz Porcar Laynez
Bioclimatic Architecture Programme
Renewable Energy Department
CIEMAT (Centro de Investigaciones Energéticas
Medioambientales y Tecnológicas)
mailto: beatriz.porcar@xxxxxxxxx
Phone: (+34) 913466344
Mobil phone: 628271620
-------------------------------
DI. Richard Heimrath
Institut fuer Waermetechnik / Institute of Thermal Engineering
Div. Solar Energy and Thermal Building Simulation
TU Graz / Graz University of Technology
Inffeldgasse 25 B, A-8010 Graz
Tel.: +43-316-873-7314
Fax: +43-316-873-7305
E-mail: heimrath@xxxxxxxxxxxxx
Web: www.iwt.tugraz.at