[TRNSYS-users] TRNbuild and wall materials

[David BRADLEY]

Aisha,
   It can be done but it requires some manual modifications of the 
TRNSYS input file (*.dck) outside of the Studio. Below are the basic 
steps that you need to follow:

1. first, you need to make a *.b17 file for each one of the cases that 
you want to run in your parametric study. Save each one with a different 
name.
2. Open the *.dck in TRNEdit and find the ASSIGN statement that 
corresponds to the *.b17 file. It should look something like the following:

ASSIGN "building\DHS_Baseline(v2).b17" 31

3. Following the syntax given, make an ASSIGN statement for each of the 
cases that you want to run. Give a different number to each one but 
search through the *.dck and make sure that the numbers that you choose 
are not used in another ASSIGN statement. For example:

ASSIGN "building\DHS_Baseline(v2)_case1.b17" 31
ASSIGN "building\DHS_Baseline(v2)_case2.b17" 32
ASSIGN "building\DHS_Baseline(v2)_case3.b17" 33
ASSIGN "building\DHS_Baseline(v2)_case4.b17" 34

4. Find the section that defines Type56. It might look something like:

UNIT 5 TYPE 56     DHS ICE
*$UNIT_NAME DHS ICE
*$MODEL .\Loads and Structures\Multi-Zone Building\Type56.tmf
*$POSITION 479 301
*$LAYER Main #
*$#
PARAMETERS 3
31        ! 1 Logical unit for building description file (.bui)
0        ! 2 Star network calculation switch

5. you need to add a CONSTANTS statement before the definition of Type56 
so that the logical unit number containing the building description file 
is given by a variable name instead of by a numerical value. You will 
have something like the following (changes are noted in red):

CONSTANTS 1
LU_56 = 31

UNIT 5 TYPE 56     DHS ICE
*$UNIT_NAME DHS ICE
*$MODEL .\Loads and Structures\Multi-Zone Building\Type56.tmf
*$POSITION 479 301
*$LAYER Main #
*$#
PARAMETERS 3
LU_56        ! 1 Logical unit for building description file (.bui)
0        ! 2 Star network calculation switch

6. lastly, create a parametric table in TRNEdit that has as many runs a 
you have cases and which redefines the value of the constant LU_56 for 
each run according to the numbers that you chose for your ASSIGN 
statements in step 3.
Kind regards,
  David


On 11/28/2014 08:42, Ayesha Mohammed Al Qubaisi wrote:
>
> Dear all,
>
> I would like to do a parametric study in which I can change the wall 
> materials defined in TRNbuild and see the change on the building 
> loads.( Cooling loads)
>
> can someone let me know how to do this easily ?
>
> For the meantime, I do this manually, by changing it in TRNbuild every 
> time.
>
> Please let me know ?
>
> Thank you for your time,
>
> Aisha
>
>
>
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> TRNSYS-users at lists.onebuilding.org
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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 at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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