Re: [EnergyPlus_Support] Re: Problems on Large Building Simulation

On Thu, Aug 11, 2011 at 10:04 PM, Michael Zentner <mz@xxxxxxxx> 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.
> >
>

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