[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [TRNSYS-users] Possibility of running simulation in Fortran Environment
Dear Areemit Narongwit,
I am not entirely sure how to answer your question. From a technical
point of view, I imagine that you could rewrite enough of the TRNSYS
subroutines so that they would work within the framework of your existing
Fortran program. However, TRNSYS has a lot of routines that deal with the
overhead of a simulation (making time progress, reading the input file to
determine the structure of the system that you are trying to simulate,
determining convergence, plotting, printing, reading weather data, etc.) It
seems as though the process of rewriting all of those capabilities would be
quite time consuming.
The stored variable concept in TRNSYS is not too terribly complex.
Basically there are three operations.
1. reserving the required amount of space in the storage structure, which
is done during simulation initialization by calling the subroutine
setStorageSize().
2. placing variables into storage at an appropriate time by calling the
setStorageVars() subroutine.
3. retrieving variables from storage at an appropriate time by calling the
getStorageVars() subroutine.
the most common sequence of operations is as follows. Say that you want to
store 2 variables. Reserve 4 spots in the storage structure. The first two
spots will hold the values of the two variables at the end of the previous
time step (which are the same as the values of the two variables at the
beginning of the current time step). The second two spots will hold the
most recently calculated values of the two variables. At each time step,
directly after reading the current input values, call getStorageVars in
order to retrieve the values of the two variables at the end of the
previous time step. Just before you set the outputs at each time step, call
setStorageVars to set the most recently calculated values of the two
variables. At the very last call in each time step (when INFO(13) = 1)
replace the first two storage spots with the variables in the second two
storage spots.
There is an example component that shows how to use storage available for
download at http://www.trnsys.com by following the "freebies" link on the left.
Kind regards,
David
At 02:31 7/14/2006, Narongwit Areemit wrote:
Dear Sir,
As i am very new to TRNSYS as well as this mailing list. Please forgive
me if what i ask have already been asked before. According to my research
mean, we would like to calculate the results involving buildings with
hygroscopic material considering the moisture capacity of the building
components together with solar desiccant system. As long as i am
concerned, TRNSYS and TESS libraries provide me components enough to
perform the calculation of solar desiccant system, but , i am not so sure
about the hygroscopic material simulation. Fortunately, i used to make a
hygroscopic simulation program on Fortran environment. So it would be
great if i can combine my program together with TRNSYS. But the thing is,
in order to transform my program into TRNSYS components, it seems to be a
number of difficulties involving the stored variable concept in TRNSYS.
So, would it be possible to, reversely, use the Fortran source code of
TRNSYS, components as a subroutine to run together with my program on
Fortran environment without dealing with DLL or other interfaces thing?
Looking forward to hearing from you. and i would like to express my
gratitude in advance
Best regards
Areemit Narongwit
The University of Tokyo
_______________________________________________
TRNSYS-users mailing list
TRNSYS-users@engr.wisc.edu
https://www.cae.wisc.edu/mailman/listinfo/trnsys-users
****************************************************************************************
Thermal Energy System Specialists (TESS), LLC
David BRADLEY 2916 Marketplace Drive - Suite 104
Partner Madison, WI 53719
Phone: (608) 274-2577 USA
Fax: (608) 278-1475
E-mail: bradley@tess-inc.com
Web Pages: http://www.tess-inc.com and http://www.trnsys.com
"Providing software solutions for today's energy engineering projects"
****************************************************************************************