[TRNSYS-users] Bug found when using variable values as strings in TRNSYS 16.1

keilholz, werner werner.keilholz at cstb.fr
Tue May 17 01:56:01 PDT 2011
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I'm not sure what you mean by " failing to insert the correct variable name ", but there have been versions of TRNSYS where string inputs have been handled differently / incorrectly (depending on who you are). Please try again with the latest version (http://sel.me.wisc.edu/trnsys/user17-resources/index.html )
and if the problem persists, send us an example.

Werner

-----Message d'origine-----
De : trnsys-users-bounces at cae.wisc.edu [mailto:trnsys-users-bounces at cae.wisc.edu] De la part de CHEZE David 227480
Envoyé : lundi 16 mai 2011 10:31
À : keilholz, werner; jochen.doell at ise.fraunhofer.de; trnsys-users at cae.wisc.edu
Objet : Re: [TRNSYS-users] Bug found when using variable values as strings in TRNSYS 16.1

Hi,

I'm opening again an old TRNSYS 16 .tpf file with TRNSYS17 Studio, minor modifications and saving it with TRNSYS17 STudio, inserting constants and equations variables in order to use it as String "inputs" at connecting phase, saving again : 
==>when I write the deck file and open it , it's still failing to insert the correct variable name in the deck (still as initial values)...
 I was used to work a lot with named variables in previous TRNSYS 14.2 trd/dck and I think it should be still available in the present versions.

I'm using 17.00.018, is there already patch version available somewhere ?

Thanks,

David 
 



-----Message d'origine-----
De : trnsys-users-bounces at cae.wisc.edu [mailto:trnsys-users-bounces at cae.wisc.edu] De la part de keilholz, werner
Envoyé : mardi 5 avril 2011 11:49
À : jochen.doell at ise.fraunhofer.de; trnsys-users at cae.wisc.edu
Objet : Re: [TRNSYS-users] Bug found when using variable values as strings in TRNSYS 16.1

Well, it is because of such "bugs" that we make new versions, like this thing called Trnsys 17! :-)

Trnsys 17 now has 3 equation processors to choose from, so you can define the behavior you want. (The 'old' behavior can be useful, to speed up the simulation in cases where the update is not needed at every time step). 

And that's just one of the many great benefits you get by updating!

Werner

-----Message d'origine-----
De : trnsys-users-bounces at cae.wisc.edu [mailto:trnsys-users-bounces at cae.wisc.edu] De la part de Jochen Doell Envoyé : mardi 5 avril 2011 10:44 À : trnsys-users at cae.wisc.edu Objet : [TRNSYS-users] Bug found when using variable values as strings in TRNSYS 16.1

Dear TRNSYS developers,

Maybe this is not new to you, but I may have found a serious bug in TRNSYS 16.1 (16.01.0003).

It is not possible to use a variable value from an equation as an input without connecting the equation and the component. I.e. declaring an input as "string" and entering the variables name does not work!
To be more precise: The component will only take the value the variable has at the first timestep of the simulation.

Best regards,
Jochen


trnsys-users-request at cae.wisc.edu schrieb:
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> ----------------------------------------------------------------------
> --
>
> Today's Topics:
>
>    1. Wind direction in TMY2 (Ratnalee Patil)
>    2. chiller performance with type 42? (Cramer Silkworth)
>    3. TRNSYS models for longwave radiation exchange within	a zone
>       (simge andolsun)
>    4. why the model couldn't converge with a fictif wall	represente
>       direct contact (Yujun TAO)
>   
>
> ----------------------------------------------------------------------
> --
>
> Betreff:
> [TRNSYS-users] Wind direction in TMY2
> Von:
> "Ratnalee Patil" <Ratnalee at innovativedesign.net>
> Datum:
> Mon, 4 Apr 2011 13:36:01 -0400
> An:
> "Wang, Fu Qiao" <FuQiao.Wang at WSPGroup.com.cn>, 
> <trnsys-users at cae.wisc.edu>
>
> An:
> "Wang, Fu Qiao" <FuQiao.Wang at WSPGroup.com.cn>, 
> <trnsys-users at cae.wisc.edu>
>
>
> Dear Fuqiao,
>
> Your guess is correct; N = 0 or 360, E = 90, S = 180, & W = 270. 
> As Matt mentioned, you can find the convention used for wind direction 
> in TMY2 data in Table 3-2 on 
> http://rredc.nrel.gov/solar/pubs/tmy2/tables.html
>
> Regards,
> Ratnalee Patil
> B.Arch., M.A.Sc. Engineering
> Sustainable Design Analyst
> Innovative Design
> 850 West Morgan St.
> Raleigh, NC 27603
> Ph: (919) 832-6303
> Fax: (919) 832-3339
> www.innovativedesign.net
>
>
> -----Original Message-----
> From: Matt Duffy [mailto:duffy at tess-inc.com]
> Sent: Monday, April 04, 2011 8:55 AM
> To: Wang, Fu Qiao; trnsys-users at cae.wisc.edu
> Subject: Re: [TRNSYS-users] TRNSYS-users Digest, Vol 76, Issue 2
>
> Dear fuqiao,
>
> I am not sure, but you can refer to the NREL documents about TMY2 
> weather files. I am confident that the information will be in there.
>
> Best regards,
>
> Matt Duffy
>
>
>
> ----- Original Message -----
> From: "Wang, Fu Qiao" <fuqiao.wang at wspgroup.com.cn>
> Sent: Fri, April 1, 2011 22:13
> Subject:[TRNSYS-users] 答复: TRNSYS-users Digest, Vol 76, Issue 2
>
>
> Dear all
>
> In tmy2 weather data, what is the reference orientation for the angle 
> of the wind velocity? For example, 90 degree, does it mean east, 180 
> degree, means south?
> Thank you very much in advance.
> Cheers
> fuqiao
>
> -----邮件原件-----
> 发件人: trnsys-users-bounces at cae.wisc.edu 
> [mailto:trnsys-users-bounces at cae.wisc.edu]
> 代表 trnsys-users-request at cae.wisc.edu
> 发送时间: 2011年4月2日 1:00
> 收件人: trnsys-users at cae.wisc.edu
> 主题: TRNSYS-users Digest, Vol 76, Issue 2
>
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> ----- End of original message -----
>
>
>   
>
> ----------------------------------------------------------------------
> --
>
> Betreff:
> [TRNSYS-users] chiller performance with type 42?
> Von:
> Cramer Silkworth <silkworth at transsolar.com>
> Datum:
> Mon, 4 Apr 2011 22:32:32 +0200
> An:
> trnsys-users at cae.wisc.edu
>
> An:
> trnsys-users at cae.wisc.edu
>
>
> Hi All,
>
> I have performance data for a chiller from the manufacturer, with thermal capacity and electrical power demand for varying part load fractions, for a series of condenser water temps (60-85F, in 5F increments). Seems like I need type 42, but other than the general description in the documentation, I've no idea how to start using it. Is there a more detailed manual and/or example file?
>
> Thanks,
> Cramer
>
> Cramer Silkworth
> 212 219 2255 | silkworth at transsolar.com Transsolar Inc. | 134 Spring 
> Street Suite 601 | New York, NY 10012
>
> Transsolar Climate Engineering
> Technical consulting for energy efficiency and environmental quality in buildings.
> New York - Stuttgart - Munich
>
>   
>
> ----------------------------------------------------------------------
> --
>
> Betreff:
> [TRNSYS-users] TRNSYS models for longwave radiation exchange within a 
> zone
> Von:
> simge andolsun <simgeandolsun at gmail.com>
> Datum:
> Mon, 4 Apr 2011 21:23:21 -0500
> An:
> trnsys-users at cae.wisc.edu
>
> An:
> trnsys-users at cae.wisc.edu
>
>
> Dear TRNSYS users,
>
> I am trying to understand the differences between the three radiation 
> models listed under "Longwave radiation exchange within a zone" in 
> "Radiation Modes of Thermal Zone" feature of TRNBuild. These models
> are:
>
> 1) Standard model (starnet model)
> 2) Simple model (one node model with combined heat transfer coeff.)
> 3) Detailed model (based on view factors)
>
> The manuals do not refer to these radiation models using the exact 
> names listed in TRNBuild; therefore I am feeling difficulty 
> understanding which of the three models is actually being discussed.
> Could you please briefly explain the primary differences between the 
> calculations of these radiation models? I would also appreciate it 
> very much if you could direct me to the specific sections of the 
> manual (or to the related papers/thesis) that I should read to learn 
> more about each model.
>
> Thanks in advance,
> Best,
> Simge Andolsun
>
>   
>
> ----------------------------------------------------------------------
> --
>
> Betreff:
> [TRNSYS-users] why the model couldn't converge with a fictif wall 
> represente direct contact
> Von:
> Yujun TAO <aleck1314 at yahoo.fr>
> Datum:
> Tue, 5 Apr 2011 07:53:48 +0100 (BST)
> An:
> TRNSYS USERS <trnsys-users at engr.wisc.edu>
>
> An:
> TRNSYS USERS <trnsys-users at engr.wisc.edu>
>
>
> Hello,
> I use a fictif wall without resistance in my work to represente a 
> direct contact between 2 zones, the name in the model jointed here is 
> mur-fictive, i give a very big hi (internal heat convective heat 
> transfer coefficient) et he (external heat convective heat transfer 
> coefficient) to model a good contact, but it couldn't converge. If i give 0 to hi and he, it turns very well.
>
> So i don't understand should give 0 to turn simulation or the wall 
> could not be modelized like this.
> Thanks
> Aleck
>   
> ----------------------------------------------------------------------
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>
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>   

--
_________________________________________________

Dipl.-Ing. (FH) Jochen Döll
Dept. Thermal Systems and Buildings

Fraunhofer-Institut für Solare Energiesysteme ISE Heidenhofstrasse 2, 79110 Freiburg, Germany

Phone:	+49 (761) 4588-5468
Fax:	+49 (761) 4588-9000
Mail:	jochen.doell at ise.fraunhofer.de
Web:	www.ise.fraunhofer.de
_________________________________________________

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