ETFE simulation_ EP and Radiance

Hi,

I have been trying to model ETFE cushions for EP and Radiance. For Radiance I am introducing manually results as produced by LBNL but for EP I have my doubts if a representation of a single layer using "windowMaterial" component is enough as ETFE cushions have a different behavior than that of a glass window. Especially when it comes to model more complex ETFEs with extra (shading/printed) layers and varying behavior during time I think that any simulation that is currently available is not representative enough. Any ideas/thoughts?

I am attaching a paper "ENERGY MODELLING OF ETFE MEMBRANES IN BUILDING APPLICATIONS" from H. Poirazis et al explaining the behavior of ETFEs (p. 701) with with a frit intermediate layer as a reference.

Thank you in advance

Tasos

Attachments:

ETFE_Paper from IBPSA.pdf, 235 KB

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Replies to This Discussion

Permalink Reply by byron mardas on December 7, 2015 at 2:22am

Hi Mostapha,

I appreciate the reply. I don't know why I did not think of the TIF>HDR. I will give it another go, to understand exactly how to write the object within .rad. I will let you know how it went.

regards,

Byron

Permalink Reply by Mili Kyropoulou on March 27, 2017 at 7:26am

Hi Mostapha,

I am reading your paper and trying to create a texture mapping for ETFE in Radiance. Have you ever released the custom component you are referring to as "export mesh and mapping from Grasshopper to Radiance"?

Thank you for the paper and work!

Permalink Reply by Mostapha Sadeghipour Roudsari on March 28, 2017 at 10:02am

Hi MK. Unfortunately the answer is no. We should put this also on top of the list once honeybee[+] is out.

Permalink Reply by Theodoros Galanos on February 4, 2016 at 12:56am

Hello!

Reviving this.

I am trying to model an ETFE canopy and I was wondering if someone has radiance material definition created for a ETFE. I will be trying with Window and BSDF file but thought I'd ask first.

Thanks in advance.

Kind regards,

Theodore.

Permalink Reply by Anastasios Kokkos on February 5, 2016 at 5:31am

Hi Theodore,

I tried importing from WINDOW with the new components of the new release and I get results in the right directions. My biggest question mark though was the actual modelling of the cushions in WINDOW as I couldn't find a direct way to model the ETFE layer itself. If you have any updates with this please let me know, I am highly interested :)

Thanks

Tasos

Permalink Reply by Theodoros Galanos on February 5, 2016 at 6:47am

Hi Tasso,

Do you mean you managed to import typical glazing with Window+BDSF? I think I've managed that as well. But yes, the problem in this case is that there is nothing in the database of Window for ETFE. For my part, what I did was a very simple custom radiance material in HB, using quite high numbers of transmittance (smth ETFE is famous for?).

I'm lucky enough to be doing outdoor studies so I mostly care about shading of an area almost 30m below. In which case I'm assuming small impact by modeling them as a simple radiance surface. Sorry I can't help more. I will look into it in the future, perhaps I am lucky and I am able to drill some info out of a supplier.

I also did not use Mostapha's method since it involves a number of custom made components and radiance functions I don't have the time to learn now. However, I was wondering if anyone has modelled ETFE as simple radiance materials to see if I'm close.

@Mostapha

For the printed pattern I used intermediate panel surfaces made from Lunchbox and made them opaque (for the first test). Is this crude method anywhere close to what you're doing? :) Is it smth I can use for a simple outdoor radiation study?

Kind regards,

Theodore.

Permalink Reply by Ibby on June 20, 2017 at 10:27pm