[EnergyPlus_Support] Re: condfd Vs ctf

["basill_xw" <basill_xw@xxxxxxxxx>]

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@...
>




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