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Re: [EnergyPlus_Support] Re: Finite difference method error



Liam:

If you haven't posted your input file elsewhere, and you are able to, could you?  I'd like to have a look, as I am also working with the finite difference algorithms.

Thanks,
Edwin Lee
EnergyPlus Development Team

On Fri, Oct 23, 2009 at 07:03, YuanLu Li <yli006@xxxxxxxxxxx> wrote:
 

Is the longer axis of the building, North-South, or East West?
 
Are the two zones joined with a partition or separate?

The sun and wind are turned off.  What do you think would be the external conditions?  DesignDay, sizing and normal run period may give different answers.
 
Turn the building around at different orientation angles and see how the values changes.  

 Dr. Li  



 
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: tincandanedo@xxxxxxxxx
Date: Thu, 22 Oct 2009 23:03:48 +0000
Subject: [EnergyPlus_Support] Re: Finite difference method error

 
This is interesting... Have you tried changing the time step? Another possibility is that the system hasn't reached steady state. Finally, is it possible to change the size of the control volume?

José Candanedo

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "liambrn" <liambrn@...> wrote:
>
> I have created two adjacent zones with identical wall constructions, geometry and boundary conditions. I turned sun and wind exposure off. The temperatures are free floating. However, I'm seeing a difference of about 3C between the two zones throughout the day. The zones remain within ~0.2C using the ConductionTransferFunction method. Thoughts?
>
> Thanks.
>
> Liam O'Brien
>



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