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

Tue Apr 5 01:44:17 PDT 2011

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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-- 
_________________________________________________

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
_________________________________________________