Re: [EnergyPlus_Support] Re: condfd Vs ctf

["Michael J. Witte" <mjwitte@xxxxxxxx>]

Known_Issues-V2-0-0.htm may be found in the root EnergyPlus folder, by default 
this is c:\EnergyPlusV2-0-0

Regarding the differences between CTF and CondFD, I do not have any other 
suggestions at this point.

Mike


On 8 Jun 2007 at 15:52, basill_xw wrote:

> hello,Mike. I juse did the modification as you tell me. I replace 
> all Regular-R materials with equivalent materail:Regular. But there 
> still have a big difference between the two results.Maybe there are 
> some other reasons.
> And I have read #7236 carefully , but didn't find the information 
> about the condfd algorithm. 
> I am a new user of e+. Where can i find the "Known_Issues-V2-0-
> 0.htm"? 
> thanks for your reply!
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte" 
> <mjwitte@...> wrote:
> >
> > This is a known issue (see #7236 in Known_Issues-V2-0-0.htm).  The 
> problem does 
> > not occur in all models.  We are investigating why and when it 
> happens.  One 
> > thing we do know is that Material:Regular-R can cause problems.  
> So, one thing 
> > to try is to replace all Material:Regular-R objects with 
> equivalent 
> > Material:Regular.
> > 
> > Mike
> > 
> > 
> > On 6 Jun 2007 at 4:24, basill_xw wrote:
> > 
> > > I will simulate a building containing PCMs.So I would like to 
> test 
> > > energy+ calculations using CondFD instead of CTF for a buliding 
> without 
> > > PCMs.
> > > I created a buliding model(about 10 thermal zones) wihtout 
> heating and 
> > > cooling equipments in 
> > > designbuilder V1.3. First I finished the simulation with CTF 
> algorithm
> > > (time step in hour is 6).Sencond I finished the simulation with 
> Condfd
> > > (time step in hour is 60). And both algorithms reach convergence 
> during 
> > > the warmup days.
> > > Then I compared the two results,there is a big difference 
> between the 
> > > two results. The amplitude of indoor temperature(from Condfd 
> algorithm)
> > > is much smaller than the amplitue of indoor temperature(from CTF 
> > > algorithm).
> > > And I have done the same work in e+ v2.0. There is the same 
> problem.
> > > 
> > > Does anybody know why ?
> > > thank for your help in advance!
> > > 
> > > 
> > > 
> > > 
> > > The primary EnergyPlus web site is found at:
> > > http://www.energyplus.gov
> > > 
> > > The group web site is:
> > > http://groups.yahoo.com/group/EnergyPlus_Support/
> > > 
> > > Attachments are not allowed -- please post any files to the 
> appropriate folder
> > > in the Files area of the Support Web Site.
> > > 
> > > EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf 
> under the
> > > Documentation link and press the "search" button.
> > > 
> > > Yahoo! Groups Links
> > > 
> > > 
> > > 
> > > 
> > > 
> > 
> > 
> > ========================================================
> > Michael J. Witte, GARD Analytics, Inc.
> > EnergyPlus Testing and Support      
> > EnergyPlus-Support@...
> >
> 
> 
> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
> 
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
> 
> Attachments are not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
> 
> EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the
> Documentation link and press the "search" button.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 






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