Re: [TRNSYS-users] Error simulation time step

[Sinchote Keeratianant <cole_sin@hotmail.com>]

Dear Jeff,

Thank you for your comment.

My modeling was made simulation every hour in the whole year.  I try to follow your idea, but unfortunately the system still show the same error.

Sinchote Keeratianant

M.Eng Energy&Technology Management Student

The Joint Graduate School of Energy and Environment (JGSEE)

+(66)87-513-3561

cole_sin@hotmail.com

---

From: Jeff Thornton <thornton@tess-inc.com>
Sent: 17 July 2018 1:29 AM
To: TRNSYS users mailing list at OneBuilding.org
Cc: Sinchote Keeratianant
Subject: Re: [TRNSYS-users] Error simulation time step

 

Would you control the real system that you are modeling to make decisions only once an hour?  That’s what you are replicating by having an hour timestep.  Add pipes, reduce your timestep to ~1 minute and you’ll start to see results that you’d see if you built this system.

Jeff 

Sent from my iPhone

On Jul 16, 2018, at 1:58 AM, Sinchote Keeratianant via TRNSYS-users <trnsys-users@lists.onebuilding.org> wrote:

Dear TRNSYS users,

     I use TRNSYS 18 for solar absorption cooling system as in Fig.1. While i set the simulation time step was 5 minutes, the system can simulate. However, when i changed the simulation time step into 30 minutes or 1 hour, the system cannot operate. The TRNSYS program show 2 error that below(as see in Fig.2)

1.)TRNSYS Messsage 203 ---> A convergence problem was encountered. Modification of the TOLERANCES control card may cure the problem.

2.)TRNSYS Messsage 450 ---> The maximum number of warnings allowed per simulation has been exceed. Please fix these warnings or increase the limit on the number of warnings allowed per simulation  

    Then i wonder that why i cannot set the simulation time step at any time. Does anyone have any idea or solution? 

Thank you for your comment.

 

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                                                                      Figure 1

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                                                                     Figure 2

Sinchote Keeratianant

M.Eng Energy&Technology Management Student

The Joint Graduate School of Energy and Environment (JGSEE)

+(66)87-513-3561

cole_sin@hotmail.com

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