Re: [TRNSYS-users] Building simulation - Zones temperature dynamics

[Mariam Elnour <mariam.elnour@outlook.com>]

Dear David,

    Thank you for your reply and help. It makes sense now. I will try your suggestion. 

Thanks again and best regards,

Mariam

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From: David BRADLEY <d.bradley@tess-inc.com>
Sent: Wednesday, May 6, 2020 5:35 PM
To: TRNSYS users mailing list at OneBuilding.org <trnsys-users@lists.onebuilding.org>
Cc: Mariam Elnour <mariam.elnour@outlook.com>
Subject: Re: [TRNSYS-users] Building simulation - Zones temperature dynamics

 

Mariam,

 The wall transfer function coefficients are computed with a certain time base. When you run a simulation in which your time step is a lot smaller than the wall time base you start to see the times at which the wall transfer function coefficients are updated, which produces this step-like plot. Depending on the construction of the walls in your building, you can probably reduce the wall timebase and get rid of the steps. The time base is set in TRNBuild's output manager. I'd suggest using a 0.25h time base.

kind regards,

 David

 

On 05/06/2020 04:42, Mariam Elnour via TRNSYS-users wrote:

Dear colleagues,

    I am simulating a 3-floor building to observe the change in the zones' temperature.   In reference to the plots below, I noticed that the temperature transition has a stair-like behavior. The simulation step is 0.015 hr (1 min). I would appreciate your help with this as I don't seem to figure what is causing it? 

     

Regards,

Mariam

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David BRADLEY
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