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

[Linda Lawrie <linda@xxxxxxxxxxxxxx>]

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@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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>>> 
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>>> 
>> 
>>