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[EnergyPlus_Support] Re: Problems on Large Building Simulation
Hello,
Sorry for the late reply.
Actually I had sent the input file to the helpdesk few days ago and got the respond shortly after.
The problem occured because I had entered too many gridpoints in the illuminance map (400 in 20x20 layout) and fenestration surfaces (64 surfaces).
The 32-bit system cannot handle the simulation and I have to run on a 64 bit system.
For information, the Intel T2300 CPU on my computer is a 32-bit processor, so it cannot support a 64-bit OS.
I have try to reduce the gridpoints to 100 (10x10) and the simulation run well in my computer (32-bit). But I haven't simulate the original file in a 64-bit computer, maybe in this week I should have do that.
Thank You
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Linda Lawrie <linda@...> wrote:
>
> Has the original poster sent the input file to the helpdesk for
> assistance?
>
> On Thu, 11 Aug 2011 19:04:40 -0700, Michael Zentner <mz@...> wrote:
> > More RAM will definitely help. 2 Gig is probably not nearly enough for
> > simulations.
> >
> > But the error says "insufficient virtual memory", which is not an ePlus
> > issue.
> >
> > Google "Windows increase virtual memory".
> >
> >
> >
> > On Aug 10, 2011, at 8:55 AM, Linda Lawrie wrote:
> >
> >> You can create it that way -- which will give better coverage for the
> >> internal distribution or you could create one and use the "multiplier"
> >> field to get the 10 factor.
> >>
> >> At 09:52 AM 8/10/2011, kudaputih_gp wrote:
> >>
> >>> Thank you for your explanation.
> >>>
> >>> Sorry, maybe this is a very basic knowledge in building energy
> >>> simulator, but I don't understand what is the meaning of 'lumped
> >>> window'.
> >>>
> >>> Does it mean if we have several windows that located in same side of
> >>> the building wall , say 10, that occupied area of 1 m2 each, we don't
> >>> have to create 10 fenestration surfaces (1 m2 each), but we just
> create
> >>> a 10 m2 fenestration surface ?
> >>>
> >>> Thank you
> >>>
> >>> Laksana Gema P.
> >>> Yogyakarta - Indonesia
> >>>
> >>> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Jean marais"
> >>> <jeannieboef@> wrote:
> >>> >
> >>> > Suggest you register at the energy plus support internet site and
> >>> > submit your file with a ticket to the support. It is very unlikely
> >>> > that your computer is not up for the task. check rather that you
> have
> >>> > the correct version fitting to your operating system and 32 or 64 Mb
> >>> > machine. Try run a simple box, first to see if it completes like you
> >>> > expect. then add some windows the same way as on your big model and
> >>> > try again.
> >>> >
> >>> > Energy Plus can model buildings which are millions of squaremeters
> in
> >>> > Floor Space. It is mainly a energy simulator and windows are usually
> >>> > lumped. lots of complex fenestration slows things down the most of
> >>> > all.
> >>> >
> >>> > Make sure you only run one day.
> >>> >
> >>> > Make sure you have daylighting objects in the zones you are
> >>> > investigating.
> >>> >
> >>> > Take an example file (from the folder with the hundreds of examples)
> >>> > with daylighting (find example using excel lists in same folder) and
> >>> > play with it.
> >>> >
> >>> > Check that you map output grid is set up properly.
> >>> >
> >>> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "kudaputih_gp"
> >>> > <kudaputih_gp@> wrote:
> >>> > >
> >>> > > Hello,
> >>> > > I have a project for my undergraduate thesis. The project is
> >>> > > daylighting optimization of airport terminal building. The
> existing
> >>> > > building has a problem of high cooling load because of direct
> >>> > > sunlight daylighting.
> >>> > >
> >>> > > I plan to add some blinds, shading, or light shelves to reduce the
> >>> > > solar heat gain, but the keep the daylighting illuminance
> >>> > > appropriate with the standards.
> >>> > >
> >>> > > The general topic is energy conservation. I plan to simulate the
> >>> > > existing building using E+ to obtain the initial energy
> consumption.
> >>> > > I also have to simulate the building after I add some blinds,
> >>> > > shading, or light shelves. The result of the simulation is to be
> >>> > > compared.
> >>> > > At present condition, I don't have the data that needed by the
> >>> > > simulation (building dimension, building construction, etc.), but
> I
> >>> > > have obtained some general data such the building area. The area
> of
> >>> > > the building is 20 m x 200 m.
> >>> > >
> >>> > > I have created a small-scale model that the shape resembles the
> >>> > > existing building using OpenStudio and I have tried to simulate
> it.
> >>> > > The simulation is always failed and has the error message "severe
> >>> > > (41): insufficient virtual memory". For information, I use a
> >>> > > computer with Intel Centrino T2300 1,67 GHz and 2 GB RAM. This is
> >>> > > happen when I simulate the model which the size is quite small
> than
> >>> > > the original model. I'm sure when I simulate the original large
> >>> > > model, this message will appear. How to solve this problem? My
> >>> > > friends tell me that I must upgrade my RAM, is it the only
> solution
> >>> > > or is there any better solution?
> >>> > >
> >>> > > I have also been told about this following method. The building is
> >>> > > divided to several zones. Every individual zone must be simulated
> >>> > > separately to overcome this problem.
> >>> > > My questions:
> >>> > > a) Is this can solve the problem? I think the simulation result
> is
> >>> > > far different than the simultaneous simulation, and it will have
> >>> > > significant effect to validity of the result.
> >>> > >
> >>> > > b) Is this usual to simulate a individual portion of the model
> >>> > > then combine it (after several individual simulation) rather than
> >>> > > simultaneous simulation to simulate a very large model?
> >>> > >
> >>> > > c) Does E+ support this (individual zone simulation)? If yes,
> how?
> >>> > >
> >>> > > Thank you....
> >>> > >
> >>> > > Sincerely,
> >>> > > Laksana Gema P.
> >>> > >
> >>> >
> >>>
> >>>
> >>>
> >>>
> >>> ------------------------------------
> >>>
> >>> Primary EnergyPlus support is found at:
> >>> http://energyplus.helpserve.com or send a message to
> >>> 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 currently allowed but be mindful that not everyone has
> >>> a high speed connection. Limit attachments to small files.
> >>>
> >>> EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under
> >>> the Documentation link and press the "search" button.
> >>> Yahoo! Groups Links
> >>>
> >>>
> >>>
> >>
> >>
>
------------------------------------
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