There were actually a lot of fixes done in V7 vs V6 for the
Conduction Finite Difference algorithm -- if you see problems send both
CTF and CDF files to the helpdesk.
At 09:53 PM 1/16/2012, saleh saadi wrote:
Thanks Linda for your prompt
reply,
The simulation runs as you said with a severe error but the results I got
from this run are not comparable to CTF algorithm compared to E+ V6 (CFD
vs CTF) results at a time step 1 hr. However, I got good results from E+
V7 at time step of 20 (i.e. 3 minutes interval). Have any body
experienced this?
thanks,
Saleh
From: Linda Lawrie
<linda@xxxxxxxxxxxxxx>
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sent: Monday, January 16, 2012 7:35 PM
Subject: Re: [EnergyPlus_Support] ConductionFiniteDifference
Algorithm in E+ V7
That is a severe but the simulation continues.
If yours crashed, please send to the helpdesk.
On Mon, 16 Jan 2012 18:29:31 -0800 (PST), saleh saadi wrote:
> Dear EnergyPlus Users,
>
> I'm having both E+ V6 and V7 on my machine.
>
> I used the ConductionFiniteDifference (CDF) algorithm in E+ V6 at
a
> time step of 1 (i.e. 1 hr) and compared it to my own code that I
have
> developed. E+ plus V6 gives results that are comparable to the
CTF
> algorithm even at a time step of 1. This is still work!!.
>
> However, the V7 gives an error when the time step is 1(i.e. 1 hr)
> when
> I selected CDF algorithm . It looks like that we are forced to use
a
> time step more than 20 (i.e. less than 3 minutes) to get a
reasonable
> results. I did use time step of 20 as recommended by E+ manual and
it
> worked. However, I need to know if V7 does not support that any
more
> especially Crank-Nicholson scheme (implicit+explicit) is added
> recently.
>
> Regards,
> Saleh NJ AL-Saadi
> University of Colorado at Boulder
> Department of Civil, Environmental and Architectural
Engineering
>
>
>
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