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[EnergyPlus_Support] Re: model non-standard building facade for thermal analysis
Hi Pedro,
mhh not sure I got what you mean -- but if E+ accepts triangular faces for windows then an hexagon can be split in 6 sub triangles - my conernings with this is how much "computational" time will add to the calculation...
what do you think?
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Pedro Peixeiro <ppeixeiro@...> wrote:
>
> You can try a simpler way to tackle the problem: instead of using single
> heaxagonal surfaces, you can try do it with single rectangles properly
> (dis)aligned to best aproximate your grid. From there, you can specify
> frame withs, inside and outside projections, material properties for
> both the frames and window, and so on. And for even a more simple model
> (which might prove usefull for preliminary studies) you might want to
> create a normal rectangular window with as many horizontal and vertical
> dividers as you need. This way you only model one window, and input the
> number of dividers you need. basically it would be the first approach
> but with the "individual" windows correctly side by side (rather hard to
> explain in words :)).
>
>
>
>
> On 18-05-2011 16:28, artitecture82 wrote:
> >
> > Hi,
> > thanks for your opinion. I suspected was hard...in that case I
> > probably need to find a simplified calculation model that takes into
> > account my geometry easily...especially for shadowing calculations; I
> > will implement it in Java. Do you maybe now a good calc method I could
> > look at for this problem (envelope thermal balance+shadowing)?
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx
> > <mailto:EnergyPlus_Support%40yahoogroups.com>, Pedro Peixeiro
> > <ppeixeiro@> wrote:
> > >
> > > Hi Giulio.
> > >
> > > In my opinion, will be hard to model such a frame. Windows in Eplus are
> > > limited to 3 or 4 vertices. Modelling one hexagonal surface considering
> > > it's a window is impossible. You can try to model each hexagonal as two
> > > windows, but that way you would end up having an _extra frame right
> > > across the hexagonal area_, and two window objects for each hexagonal
> > > window (and if your total window will have that many hexagonal surfaces
> > > as there is in your link, you're in for a lot of windows). If for your
> > > study you really need those frames in that geometry, honestly don't see
> > > any other way to do it.
> > >
> > > Pedro
> > >
> > >
> > > On 18-05-2011 12:49, artitecture82 wrote:
> > > >
> > > > Hi All,
> > > > Im new to E+ and I've usually run very basic analysis for thermal
> > > > analysis of traditional building ... often approximated with boxes
> > and
> > > > few window.
> > > >
> > > > Im doing a personal research as part of my master thesis and Im
> > > > interested to compare the performance of different facades tipologies
> > > > and shapes. The goal of the analysis is given a climate and
> > > > orientation for a typical vertical facade to understand the absorbed
> > > > solar radiation and Temperature and Humidity at the interior boundary
> > > > of the facade within closest zone. So single zone model.
> > > >
> > > > My question are these:
> > > > 1) Im interested to analyse the performance of the only exterior
> > > > facade and not the whole building. Is that possible to model in E+
> > > > ..probably modelling the building as a single box volume and changing
> > > > the parameter/geometry for the facade type I want to analyse?
> > > >
> > > > 2) The geometry input. The scope of the research is actually to
> > > > understand impact of different shapes/self shading combined with some
> > > > metrial properties. So standard flat plane doesnt wotrk in this case.
> > > > Take a look at this pdf
> > > > http://dl.dropbox.com/u/5212179/sampleEnvelope.pdf .
> > > > So typically I will have a frame structure (in this case hexagonal)
> > > > and some glazing. Let say I find an automated process to convert the
> > > > 3d model in E+ coordinates. The problem Im facing is how do you treat
> > > > the frame? as a wall?
> > > > and do I need to assign orientation for each of the frame panel ?
> > > > I need to model the frame because for my assumptions it is important
> > > > to understand the shading potential of facades I am going to study.
> > > >
> > > > Thank you very much in advance for the help and advice.
> > > >
> > > > Best,
> > > >
> > > > Giulio
> > > >
> > > >
> > >
> >
> >
>
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