[TRNSYS-users] discrete time step and the simulation time step
王洋
wanghongyang1767 at gmail.com
Tue Oct 19 13:25:59 PDT 2010
Dear all,
I have some questions to ask you:
To Type 22: The manual said this controller can be used to model a real
feedback controller (e.g. PID) that would adapt its control signal
continuously or use a discrete time step much shorter than the simulation
time step in TRNSYS.
What's meaning of a discrete time step and the simulation time step ?
Do you know how many minutes this Type 22's discrete time step is ? And
what's the min. minutes this Type 22's discrete time step is ?
What's the min. simulation time step in TRNSYS?
many thanks!
br.
wang
2010/10/19 王洋 <wanghongyang1767 at gmail.com>
> Dear all,
>
> I have some questions to ask you:
>
> To Type 22: The manual said this controller can be used to model a real
> feedback controller (e.g. PID) that would adapt its control signal
> continuously or use a discrete time step much shorter than the simulation
> time step in TRNSYS.
>
> What's meaning of a discrete time step and the simulation time step ?
>
> Do you know how many minutes this Type 22's discrete time step is ? And
> what's the min. minutes this Type 22's discrete time step is ?
>
> What's the min. simulation time step in TRNSYS?
>
> many thanks!
>
> br.
>
> wang
>
> 2010/10/19 <trnsys-users-request at cae.wisc.edu>
>
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>> Today's Topics:
>>
>> 1. Re: Trigeneration simulation: printing or convergence problem
>> ? (David BRADLEY)
>> 2. fresnel Collector (farah.gammoh at mirroxx.com)
>> 3. UNSUSCRIBE (info at aacarchitecture.be)
>> 4. Re: type 109 with 5 minutes time step (Dimas Firmanda Al Riza)
>>
>>
>> ---------- 已转发邮件 ----------
>> From: David BRADLEY <d.bradley at tess-inc.com>
>> To: "wim.vansteenkiste at ugent.be" <Wim.Vansteenkiste at UGent.be>
>> Date: Mon, 18 Oct 2010 12:45:26 -0500
>> Subject: Re: [TRNSYS-users] Trigeneration simulation: printing or
>> convergence problem ?
>> Wim,
>> asterisks in the output file are often an indication that the format
>> statement for what was being printed was not correct. I am not sure what
>> component you are using for your output device but if it is either Type25 or
>> Type46 make sure that you are using an "unformatted" mode.
>> Regards,
>> David
>>
>>
>> On 10/16/2010 12:45, wim.vansteenkiste at ugent.be wrote:
>>
>>> Dear TRNSYS-users,
>>>
>>> I'm only been using TRNSYS for 2 months, so I'm quite new at it.
>>>
>>> I'm simulating a trigeneration system: a custom made gas engine model
>>> combined with an absorption chiller.
>>>
>>> TRNSYS doesn't indicate convergence problems after simulating.
>>> Based on plotted values, the simulation seems satisfactory as well.
>>>
>>> I print the output values of every component. When I view these output
>>> values, there seems to be a problem:
>>>
>>> A lot of values aren't printed. Instead of the value,
>>> "***************" appears. This happens for almost every mass flow as
>>> well as for the energy rates in the absorption chiller. The strange
>>> thing is that the values can be plotted, only when I print them I get
>>> this problem. Temperatures and other values are printed correctly.
>>>
>>> Do you have an idea of what could be the cause of this problem?
>>>
>>> Thanks in advance,
>>>
>>> Wim.
>>>
>>>
>>> _______________________________________________
>>> TRNSYS-users mailing list
>>> TRNSYS-users at cae.wisc.edu
>>> https://www-old.cae.wisc.edu/mailman/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:+1.608.278.1475
>> d.bradley at tess-inc.com
>>
>> http://www.tess-inc.com
>> http://www.trnsys.com
>>
>>
>>
>>
>> ---------- 已转发邮件 ----------
>> From: "farah.gammoh at mirroxx.com" <farah.gammoh at mirroxx.com>
>> To: "TRNSYS-users at cae.wisc.edu" <TRNSYS-users at cae.wisc.edu>
>> Date: Mon, 18 Oct 2010 17:58:59 +0200
>> Subject: [TRNSYS-users] fresnel Collector
>> Hello,
>> is there a way to simulate a fresnel collector field using once of the STE
>> models?
>>
>> thanks and best regards,
>> Farah
>>
>>
>>
>> ---------- 已转发邮件 ----------
>> From: "info at aacarchitecture.be" <info at aacarchitecture.be>
>> To: TRNSYS-users at cae.wisc.edu
>> Date: Mon, 18 Oct 2010 21:55:09 +0200
>> Subject: [TRNSYS-users] UNSUSCRIBE
>> Please Unsuscribe following adresses:
>> aac at win.be
>> info at aac-archi.be
>> info at aacarchitecture.be
>>
>> Thanks
>>
>>
>>
>> Marc Vande Perre
>> mv at aacarchitecture.be
>>
>> n.v. AAC Architecture s.a.
>>
>>
>>
>> ---------- 已转发邮件 ----------
>> From: Dimas Firmanda Al Riza <dimasfirmanda at gmail.com>
>> To: hotline <hotline at transsolar.com>
>> Date: Tue, 19 Oct 2010 10:32:47 +0800
>> Subject: Re: [TRNSYS-users] type 109 with 5 minutes time step
>> Dear all,
>>
>> I have problem again with simulation time step,
>>
>> I use Type 9 data reader, with 5 minutes time step data,
>> 1. How to write the simulation start time in (type 9) if I simulate it
>> together with weather data in June (in type 109)?
>> 2. I did a test with my data file, I connect type 9 with online plotter, I
>> put data in type 9 like the note bellow,
>> and I set simulation start time 0 stop time is 120, when I set
>> simulation time step to 5 minutes the simulation error,
>> but when simulation time step to 2.5 minutes, the simulation run,
>> Do I need to set simulation time step in control card below 5 minutes
>> if the data is in 5 minutes interval?
>> 3. I run my complete simulation, with type 9 and type 109, I set
>> simulation time step to 2.5 minutes, i run simulation for a month,
>> but the simulation run only for several hour and then stopped, I got
>> some warning:
>>
>> simulation log:
>> Radiation while sun is down found 1 times (What is this?)
>> only the first 10 warnings with data info are printed
>> check: - Time of first data line
>> - Longitude and Latitude
>> REMARK: these radiation values are set to ZERO !
>>
>> ***** WARNING FROM UNIT 2 TYPE 109 DATA READER
>> RADIATION DATA READ IN FROM FILE ==>Weather UTP - June 1-30 (5 min).109
>> AT LINE # 2 ARE SET TO ZERO SINCE SUN IS DOWN, ORIGINAL VALUE: 28.91
>> W/m²
>>
>> ***** WARNING FROM UNIT 2 TYPE 109 DATA READER
>> RADIATION DATA READ IN FROM FILE ==>Weather UTP - June 1-30 (5 min).109
>> AT LINE # 3 ARE SET TO ZERO SINCE SUN IS DOWN, ORIGINAL VALUE: 28.91
>> W/m²
>>
>>
>> Simulation lst file:
>> *** Warning at time : 61.416667
>> Generated by Unit : Not applicable or not available
>> Generated by Type : Not applicable or not available
>> TRNSYS Message 441 : The inputs to the listed units have not
>> converged at this timestep. The values at the last iteration will be used
>> and the simulation will proceed.
>> Reported information : UNITS: 4 10 11 17
>>
>> *** Fatal Error at time : 61.416667
>> Generated by Unit : Not applicable or not available
>> Generated by Type : Not applicable or not available
>> TRNSYS Message 450 : The maximum number of warnings allowed per
>> simulation has been exceeded. Please fix these warnings or increase the
>> limit on the number of warnings allowed per simulation (LIMITS command)
>> Reported information : Not available
>>
>> *** Warning at time : 61.416667
>> Generated by Unit : Not applicable or not available
>> Generated by Type : Not applicable or not available
>> TRNSYS Message 442 : The listed differential equations have not
>> converged at this timestep. The values at the last iteration will be used
>> and the simulation will proceed.
>> Reported information : DIFFERENTIAL EQUATIONS: 1
>>
>>
>> Please help me to solve this problem, thank you very much
>>
>> Best Regards,
>>
>> Dimas
>>
>>
>> ______________________________________________________________________________________________________________
>> Note:
>> Data in .txt file for type 9 (time interval 5 minutes):
>>
>> 25.07
>> 40.18
>> 42.77
>> 0.00
>> 27.82
>> 27.91
>> 15.28
>> 46.04
>> 30.81
>> 54.12
>> 33.61
>> 54.50
>> 49.43
>> 54.36
>> 85.52
>> 57.23
>> 83.40
>> 83.58
>> 105.23
>> 98.98
>> 96.83
>> 108.26
>> 113.00
>> 121.50
>>
>>
>>
>>
>> On Mon, Oct 18, 2010 at 3:59 PM, Dimas Firmanda Al Riza <
>> dimasfirmanda at gmail.com> wrote:
>>
>>> I have adjusted it by now, and it works! thanks a lot!
>>> I adjust it like below
>>>
>>> <interval> 0.08333 ! Data file time interval between consecutive
>>> lines
>>> <firsttime> 0.08333 ! Time corresponding to first data line
>>> (hours)
>>>
>>> -dimas-
>>>
>>>
>>> On Mon, Oct 18, 2010 at 3:28 PM, hotline <hotline at transsolar.com> wrote:
>>>
>>>> Dimas,
>>>>
>>>> did you also adjust the "Time corresponding to first data line" ?
>>>>
>>>> <firsttime> 1 ! Time corresponding to first data line (hours)
>>>> In addition, you need to set the simulation time step to 5 minutes.
>>>>
>>>> Marion
>>>>
>>>>
>>>>
>>>> ------------------------------
>>>> *Von:* Dimas Firmanda Al Riza [mailto:dimasfirmanda at gmail.com]
>>>> *Gesendet:* Montag, 18. Oktober 2010 02:33
>>>> *An:* trnsys-users at cae.wisc.edu
>>>> *Betreff:* [TRNSYS-users] type 109 with 5 minutes time step
>>>>
>>>> Dear all,
>>>>
>>>> I have 5 minutes time step weather data,
>>>> How to conduct simulation with 5 minutes time step using type 109,
>>>> do I need to change something in the .109 data file?
>>>> I've try to just change the data in .109 file from 1 hour time step with
>>>> my 5 minutes time step data
>>>> but when I run simulation with 5 minutes time step the results become
>>>> weird,
>>>> Thank you very much
>>>>
>>>> Regards,
>>>>
>>>> Dimas Firmanda A.
>>>> MSc student
>>>> Mechanical Engineering Department
>>>> Universiti Teknologi PETRONAS
>>>>
>>>>
>>>
>>
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>
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