[TRNSYS-users] Fwd: Error creating the wall transfer function coeffients

Fri Nov 16 04:23:54 PST 2012

Dear leen,

Thanks for your email!
I tried till 9 hours as the TIMEBASE which can work. But could you please
tell me the detailed reasons for that? i.e. why we need so large TIMEBASE 9
hours to meet its Stability Criteria?

Thanks in advance!
Br.
wang

2012/11/15 leen peeters <l.f.r.peeters at gmail.com>

> Can you open in TRNBUILD the 'project' window, and consequently the
> 'outputs', change the timebase for calculation of your transfer function to
> something higher. I think it is standard on 2 hour, change it into 5,
> check. If it works, then try 4, ..... until you reach the lowest possible
> number
>
>
> On Thu, Nov 15, 2012 at 10:28 PM, ÍõÑó <wanghongyang1767 at gmail.com> wrote:
>
>> Dear all,
>>
>> I have a question about *.BUI file. I create a project with about 30
>> zones using TRNSYS 16.
>> Before I created the seventeenth zone using the same exterior wall and
>> floor as well as interior wall etc for the project, it worked well. But
>> when the seventeenth zone created, it appeared an ERROR in TRNBuild: Error
>> creating the wall transfer function coeffients. Please see the attached
>> figure. The second file is its INF file.
>>
>> If you had some relative experience, PLEASE tell me how to solve with
>> this problem.
>>
>> Thanks in advance!
>> Br.
>> wang
>>
>> ---------- Forwarded message ----------
>> From: ÍõÑó <wanghongyang1767 at gmail.com>
>> Date: 2012/11/15
>> Subject: Error creating the wall transfer function coeffients
>> To: trnsys-users at cae.wisc.edu
>>
>>
>> Dear all,
>>
>> I have a question about *.BUI file. I create a project with about 30
>> zones using TRNSYS 16.
>> Before I created the seventeenth zone using the same exterior wall and
>> floor as well as interior wall etc for the project, it worked well. But
>> when the seventeenth zone created, it appeared an ERROR in TRNBuild: Error
>> creating the wall transfer function coeffients. Please see the attached
>> figure. The second file is its INF file.
>>
>> If you had some relative experience, PLEASE tell me how to solve with
>> this problem.
>>
>> Thanks in advance!
>> Br.
>>
>> wang
>>
>> 2012/11/12 <trnsys-users-request at cae.wisc.edu>
>>
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>>>
>>> Today's Topics:
>>>
>>>    1. Re: Type 15-2: Relationship between data arrangements,
>>>       simulation times and convergence (David BRADLEY)
>>>    2. simulation trend opposite to reality (validation)
>>>       (Karol Bandurski)
>>>
>>>
>>> ---------- ÒÑ×ª·¢ÓÊ¼þ ----------
>>> From: David BRADLEY <d.bradley at tess-inc.com>
>>> To: Flynn Ciaran <ciaran.flynn at aalto.fi>
>>> Cc: "trnsys-users at cae.wisc.edu" <trnsys-users at cae.wisc.edu>
>>> Date: Mon, 12 Nov 2012 11:09:38 -0600
>>> Subject: Re: [TRNSYS-users] Type 15-2: Relationship between data
>>> arrangements, simulation times and convergence
>>> Ciar¨¢n,
>>>   Option 1) is incorrect. Type15 is intended to be used with year-long
>>> weather files that have a 1-hour data interval. The component knows from
>>> the simulation start and stop time what day of the year it is, so if you
>>> trick it by setting the simulation start time to hour zero and rearrange
>>> the weather file to start in the middle of the year, what the Type
>>> calculates about the sunup and sundown times and what the data file says is
>>> happening are not going to match at all. Option 2 is the only correct one.
>>> Best,
>>>  David
>>>
>>>
>>> On 11/12/2012 06:32, Flynn Ciaran wrote:
>>>
>>>  Hello,****
>>>
>>> ** **
>>>
>>> I have a couple of questions concerning the relationship between the
>>> arrangement of data in TMY2 weather files, TRNSYS simulation times and
>>> convergence errors. I tried looking at the source code but I could not
>>> figure out the answer..
>>> I am running a simulation for one year, using Type 15-2 for weather,
>>> starting at 1h on July 1st and ending at 24h on June 30th. This leaves
>>> me with two options:
>>> 1) Either I rearrange the tm2 file to start at 1h on the 1st of July
>>> and end at 24h on June 30th, and set the simulation start and stop
>>> times to 0 and 8760h respectively, or
>>> 2) Either I leave the weather file as it is and set the simulation start
>>> and stop times at 4344h and 13104h respectively.****
>>>
>>> ** **
>>>
>>> When I use a provided weather file (e.g. CA-BC-Vancouver-718920.tm2) and
>>> set the simulation time step at 0.1h, I get the following:****
>>>
>>> ** **
>>>
>>> ** **
>>>
>>> Failed convergence time steps****
>>>
>>> Time steps where:
>>> calculated total horizontal radiation > horizontal extraterrestrial
>>> radiation****
>>>
>>> Time steps where:
>>> direct normal radiation > solar constant****
>>>
>>> Time steps where:
>>> calculated horizontal beam radiation > total horizontal radiation****
>>>
>>> 1)****
>>>
>>> 7719****
>>>
>>> 10664****
>>>
>>> 124****
>>>
>>> 3498****
>>>
>>> 2)****
>>>
>>> 6424****
>>>
>>> -****
>>>
>>> -****
>>>
>>> 13****
>>>
>>> ** **
>>>
>>> So my question are:****
>>>
>>> -          Why is TRNSYS giving different error messages if the same
>>> weather data are used ? (I believe that there are no other types in my file
>>> that could explain the reason for this)****
>>>
>>> -          What parameters do the radiation values calculated by TRNSYS
>>> depend on and how are they calculated? ****
>>>
>>> -          What is the best approach in this situation (minimal
>>> radiation errors)?****
>>>
>>> ** **
>>>
>>> Thanks a lot,****
>>>
>>> Ciar¨¢n****
>>>
>>> ** **
>>>
>>> ** **
>>>
>>> ** **
>>>
>>> ** **
>>>
>>>
>>> _______________________________________________
>>> TRNSYS-users mailing listTRNSYS-users at cae.wisc.eduhttps://mailman.cae.wisc.edu/listinfo/trnsys-users
>>>
>>>
>>> --
>>> ***************************
>>> David BRADLEY
>>> Principal
>>> Thermal Energy Systems Specialists, LLC
>>> 22 North Carroll Street - suite 370
>>> Madison, WI  53703 USA
>>>
>>> P:+1.608.274.2577
>>> F:+1.608.278.1475d.bradley at tess-inc.com
>>> http://www.tess-inc.comhttp://www.trnsys.com
>>>
>>>
>>>
>>> ---------- ÒÑ×ª·¢ÓÊ¼þ ----------
>>> From: "Karol Bandurski" <karol.bandurski at put.poznan.pl>
>>> To: <trnsys-users at cae.wisc.edu>, <bldg-sim at lists.onebuilding.org>
>>> Cc:
>>> Date: Mon, 12 Nov 2012 18:22:45 +0100
>>> Subject: [TRNSYS-users] simulation trend opposite to reality (validation)
>>>
>>> Dear All,****
>>>
>>> ** **
>>>
>>> I simulate the dwelling in TRNSYS. Last time a try to validate my model
>>> and I compare simulation results with measurements.****
>>>
>>> *Heat consumption* has been measured in dwelling every week (the same
>>> day of week and the same hour).****
>>>
>>> Trnsys simulation generate results for dwelling¡¯s model with ideal
>>> heating assumptions (set temperature 20/21) ¨CNTYPE2 (sensible *energy
>>> demand*).****
>>>
>>> ** **
>>>
>>> Total *heat consumption (measurements)* of dwelling and *energy demand
>>> (simulation)* of simulated model are quite similar (36 weeks from
>>> September to June), but if we look on weekly results there are bigger
>>> difference with interesting regularity:****
>>>
>>> ** **
>>>
>>> if *heat consumption* decreases from one week to the next, then *energy
>>> demand* increase, and vice versa (I enclose graph).****
>>>
>>> ** **
>>>
>>> Could you tell me what can cause this lack of coincidence?****
>>>
>>> I will be grateful for any hints!****
>>>
>>> ****
>>>
>>> Regards,****
>>>
>>> Karol****
>>>
>>> ** **
>>>
>>> ------------------------------------------------****
>>>
>>> Karol Bandurski MSc.****
>>>
>>> Institute of Environmental Engineering <http://www.ee.put.poznan.pl/>***
>>> *
>>>
>>> Poznan University of Technology****
>>>
>>> www.ee.put.poznan.pl****
>>>
>>> www.put.poznan.pl****
>>>
>>> ** **
>>>
>>> _______________________________________________
>>> TRNSYS-users mailing list
>>> TRNSYS-users at cae.wisc.edu
>>> https://mailman.cae.wisc.edu/listinfo/trnsys-users
>>>
>>>
>>
>>
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>
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