[TRNSYS-users] discrete time step and the simulation time step
王洋
wanghongyang1767 at gmail.com
Fri Oct 22 06:26:51 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
2010/10/20 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. discrete time step and the simulation time step
>> (=?GB2312?B?zfXR8w==?=)
>>
>>
>> ---------- 已转发邮件 ----------
>> From: 王洋 <wanghongyang1767 at gmail.com>
>> To: trnsys-users at cae.wisc.edu
>> Date: Tue, 19 Oct 2010 22:25:59 +0200
>> Subject: [TRNSYS-users] discrete time step and the simulation time step
>> 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>
>>>
>>>> Send TRNSYS-users mailing list submissions to
>>>> trnsys-users at cae.wisc.edu
>>>>
>>>> To subscribe or unsubscribe via the World Wide Web, visit
>>>> https://www-old.cae.wisc.edu/mailman/listinfo/trnsys-users
>>>> or, via email, send a message with subject or body 'help' to
>>>> trnsys-users-request at cae.wisc.edu
>>>>
>>>> You can reach the person managing the list at
>>>> trnsys-users-owner at cae.wisc.edu
>>>>
>>>> When replying, please edit your Subject line so it is more specific
>>>> than "Re: Contents of TRNSYS-users digest..."
>>>>
>>>> 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
>>>>>>
>>>>>>
>>>>>
>>>>
>>>> _______________________________________________
>>>> TRNSYS-users mailing list
>>>> TRNSYS-users at cae.wisc.edu
>>>> https://www-old.cae.wisc.edu/mailman/listinfo/trnsys-users
>>>>
>>>>
>>>
>>
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>>
>>
>
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