[TRNSYS-users] TRNSYS-users Digest, Vol 29, Issue 46

Wed May 23 22:55:25 PDT 2007

Dear trnsys users

  Does anyone trys to simulate a solar dryer having a dryer bed is there any one inserts anew part that is a dryer bed in trnsys studio if so please I didn't get the equation that express the bed try to write your idea to me
  thanks
  habtamu

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Today's Topics:

1. Convergence failure in the simulation (h8304506 at hkusua.hku.hk)
2. Solar combi system for domestic hot water and space heating
(Timo Sengewald)
3. Errors in rebuilding TRNDll.dll (h8304506 at hkusua.hku.hk)
4. Re: Convergence failure in the simulation (David Bradley)
5. Re: Errors in rebuilding TRNDll.dll (David Bradley)
From: h8304506 at hkusua.hku.hk
To: "group, Trnsys discussion" <trnsys-users at engr.wisc.edu>
Date: Tue, 22 May 2007 10:17:49 +0800
Subject: [TRNSYS-users] Convergence failure in the simulation

Dear all.

I am simulating a GSHP system, but receive warnings that some units do 
not converge at particular time steps. The simulation stops after the 
number of warnings reach a limit. I try to adjust the minimum 
relaxation factor and tolerance of convergence in the control card, 
but it seems to have no improvement. Please advise how I can fix it? 
Thank you!

Yours sincerely,
LEE, Chun Kwong
PhD student
Department of Mechanical Engineering
University of Hong Kong

From: "Timo Sengewald" <Timo.Sengewald at BLS-Energieplan.de>
To: <trnsys-users at engr.wisc.edu>
Date: Tue, 22 May 2007 11:11:11 +0200
Subject: [TRNSYS-users] Solar combi system for domestic hot water and space
heating

    Hello TRNSYS experts!

  Does anybody of you has any experience simulating a solar combi system using a combined tank (hot water tank within heating water tank)? Is there any type which model that kind of tank in tank system?

  Thanks in advance!

  Best Regards

  Timo

________________________________________________
Timo Sengewald

BLS Energieplan GmbH
Elsenstraße 106
D-12435 Berlin
Tel.: +49 30 53 32 81-0
Fax: +49 30 53 32 81-40

www.bls-energieplan.de
  Geschäftsführer: Christoph-F. Lange, Wolfgang Sturm
  Registergericht: Amtsgericht Berlin-Charlottenburg, HRB-Nr. 32021
  Steuernummer: 37/105/2005, USt-IdNr.: DE 136569080

From: h8304506 at hkusua.hku.hk
To: "group, Trnsys discussion" <trnsys-users at engr.wisc.edu>
Date: Tue, 22 May 2007 21:38:40 +0800
Subject: [TRNSYS-users] Errors in rebuilding TRNDll.dll

Dear all.

I have made some changes in the source code for Type108 (5 stage 
thermostat). When I try to rebuild the TRNDll.dll by opening the 
Cvf66.dsw workspace at \Trnsys16\Compilers\Cvf66\ sub-directory using 
Compaq Visual Fortran, a lot of errors are found. I am using Cvf6.5. 
Is it the cause for the errors? Please advise. Thank you!

Yours sincerely,
LEE, Chun Kwong
PhD student
Department of Mechanical Engineering
University of Hong Kong

From: David Bradley <bradley at tess-inc.com>
To: h8304506 at hkusua.hku.hk,
"group, Trnsys discussion" <trnsys-users at engr.wisc.edu>
Date: Tue, 22 May 2007 11:02:46 -0500
Subject: Re: [TRNSYS-users] Convergence failure in the simulation

Chun Kwong,
Convergnce problems are a result of one of two things usually. 
Either there is not enough thermal capacitance in a given flow loop 
(such as a piping network) or the time step is too big. If I recall, 
your simulation was using a 1 hour time step. I would recommend 
starting by reducing that time step to 0.125 hours to see if that 
solves the convergence problems. The bore field and the building in 
your system should be providing adequate thermal capacitance.
Kind regards,
David

At 21:17 5/21/2007, h8304506 at hkusua.hku.hk wrote:
>Dear all.
>
>I am simulating a GSHP system, but receive warnings that some units do
>not converge at particular time steps. The simulation stops after the
>number of warnings reach a limit. I try to adjust the minimum
>relaxation factor and tolerance of convergence in the control card,
>but it seems to have no improvement. Please advise how I can fix it?
>Thank you!
>
>Yours sincerely,
>LEE, Chun Kwong
>PhD student
>Department of Mechanical Engineering
>University of Hong Kong
>
>
>
>
>_______________________________________________
>TRNSYS-users mailing list
>TRNSYS-users at engr.wisc.edu
>https://www.cae.wisc.edu/mailman/listinfo/trnsys-users

****************************************************************************************
Thermal Energy System Specialists (TESS), LLC
David BRADLEY 2916 Marketplace Drive - Suite 104
Partner Madison, WI 53719
Phone: (608) 274-2577 USA
Fax: (608) 278-1475
E-mail: bradley at tess-inc.com
Web Pages: http://www.tess-inc.com and http://www.trnsys.com

"Providing software solutions for today's energy engineering projects"
****************************************************************************************

From: David Bradley <bradley at tess-inc.com>
To: h8304506 at hkusua.hku.hk,
"group, Trnsys discussion" <trnsys-users at engr.wisc.edu>
Date: Tue, 22 May 2007 11:04:24 -0500
Subject: Re: [TRNSYS-users] Errors in rebuilding TRNDll.dll

Dear Chun Kwong,
The compiler version could well be the cause. I recall that there 
were some bugs in the CVF 6.5 compiler that were fixed in release 6.6b.
Kind regards,
David

At 08:38 5/22/2007, h8304506 at hkusua.hku.hk wrote:
>Dear all.
>
>I have made some changes in the source code for Type108 (5 stage
>thermostat). When I try to rebuild the TRNDll.dll by opening the
>Cvf66.dsw workspace at \Trnsys16\Compilers\Cvf66\ sub-directory using
>Compaq Visual Fortran, a lot of errors are found. I am using Cvf6.5.
>Is it the cause for the errors? Please advise. Thank you!
>
>Yours sincerely,
>LEE, Chun Kwong
>PhD student
>Department of Mechanical Engineering
>University of Hong Kong
>
>
>
>
>_______________________________________________
>TRNSYS-users mailing list
>TRNSYS-users at engr.wisc.edu
>https://www.cae.wisc.edu/mailman/listinfo/trnsys-users

****************************************************************************************
Thermal Energy System Specialists (TESS), LLC
David BRADLEY 2916 Marketplace Drive - Suite 104
Partner Madison, WI 53719
Phone: (608) 274-2577 USA
Fax: (608) 278-1475
E-mail: bradley at tess-inc.com
Web Pages: http://www.tess-inc.com and http://www.trnsys.com

"Providing software solutions for today's energy engineering projects"
****************************************************************************************

_______________________________________________
TRNSYS-users mailing list
TRNSYS-users at engr.wisc.edu
https://www.cae.wisc.edu/mailman/listinfo/trnsys-users

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