Re: [EnergyPlus_Support] ConductionFiniteDifference Algorithm in E+ V7

[Linda Lawrie <linda@xxxxxxxxxxxxxx>]

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
> >
> > 
> >
> > Links:
> > ------
> > [1]
>
> http://energyplus.helpserve.com
> > [2]
>
> http://www.energyplus.gov
> > [3]
>
> http://groups.yahoo.com/group/EnergyPlus_Support/
> > [4]
> > 
> >
>
> http://groups.yahoo.com/group/EnergyPlus_Support/join;_ylc=X3oDMTJmaDlicjRlBF9TAzk3NDc2NTkwBGdycElkAzMzODc0ODgEZ3Jwc3BJZAMxNzA1MDA3Mzg5BHNlYwNmdHIEc2xrA3N0bmdzBHN0aW1lAzEzMjY3NjczNzI
> -
> > [5]
> > 
> >
>
> mailto:EnergyPlus_Support-digest@xxxxxxxxxxxxxxx?subject=EmailDelivery:Digest
> > [6]
> > 
> >
>
> http://groups.yahoo.com/group/EnergyPlus_Support;_ylc=X3oDMTJkN2c4NmhyBF9TAzk3NDc2NTkwBGdycElkAzMzODc0ODgEZ3Jwc3BJZAMxNzA1MDA3Mzg5BHNlYwNmdHIEc2xrA2hwZgRzdGltZQMxMzI2NzY3Mzcy
> > [7]
>
> http://docs.yahoo.com/info/terms/
> > [8] 
> >
>
> mailto:EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx?subject=Unsubscribe

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