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Advanced daylight modeling of façade systems for energy and comfort analysis
David Geisler-Moroder, Bartenbach GmbH, Aldrans, Austria
Tuesday, Oct. 29, 2019 · 12:16 p.m. · 12m 32s
BSDF characterization concepts for advanced façade systems - Typology & application based requirements to BSDF resolution - Proposed method for generating BSDFs for daylight systems
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thank you i'm gonna miss the castle i'm from pardon well i'm liking design company
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and i'm like two percent some worker doing within an um
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i. e. task within an international project um as well also doing
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that to hear that at a presentation here the basic work behind
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that was done together with guys from albion elf eleanor and toning
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i'm giving a short background why are we
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a partner doing research doing basic research at the
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background for for providing our design it for providing
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or people working with architects with them like just
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findings latest knowledge um short background in our company
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pardon off um assassins that the lighting design company
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um route nineteen ninety employees with fourteen lighting design
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we look at it in austria um closed in spoke and uh that's the place where we we have our office
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um that's what we have dedicated to do a lot of the lighting design obviously and um
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in our company is that as a set as it about forty people in the lighting design
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so the rest um that's about twenty five falls in the r. and b. group to be quite
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a big r. and d. department doing a research
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and development behind it's um to support our designers
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um and also to do developments for industry to
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provide service for industry um in our um company
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can some colours missing that no matter um different divisions that we have um and
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doing different parts of two worked alongside not officially signed obviously for the lighting design work
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um but also the research and development is a big part i'm packing up um those designs and
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from from these groups from these people working there we can choose for every project what is the right
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constellation that we need for that project so for for small projects we we do everything from there
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planning to the installation um we might do on the
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artificial lighting and and to complete lighting solution here but
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for something like the mac or cocked are we need everything from artificial lighting design daylight inside research
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and also um materials consultation perceptual psychology would also doing now
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off um today and at present something that is um uh the technical
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project we're doing within the id a um it's
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called the credit solutions for the lighting and electric lighting
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um it's an international task with them fifteen uh countries participating and about twenty
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to um uh companies or research institute's i'm joining um
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very short that's your structure to task and um i'll talk about that
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part c. here that's the sub just see um well i'm responsible for is
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the design support for practitioners it's about tool standards
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and guidelines and um what we're doing here is um
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uh basically looking looking on uh what is the latest research what is
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the latest developments that are out there uh and shouldn't need to find
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a way on to that desktops and on to do what pleases i'm
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off to practitioners so that they have tools attentive standards that entity can
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better perform the sign in terms of integration of like to come
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to that eleven design um and one special case we've referred that
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before here that they lighting simulations and delighting analysis uh as an
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important part in designing buildings in in designing the overall energy consumption
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but also for visual in a non visual effects reflecting um instill this this sum up
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parts missing they are um which is that that part to here to standardisation of yes yes
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um data standardisation of the characterisation of the systems so what is behind that um
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may short a. b. s. d. f. what is it yes yes if you
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compare these two renderings um it's basically just driving the same situation it's a room
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um with the initial blinds install the toughest thought once we have the geometry of the initial blinds
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and once we have to be us yes so that is it is a representation it to data
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it's the database that data um format behind how
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to describe um a day lighting system a facade
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system to implement in a a a a lighting design soft how can we think about that we
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for for example in a um a four cars we know pretty much everything
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how to do uh we have every everything standard that we know how to describe
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every technical part of the car we also have that for electric lighting we know and i yes file and all
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them that file how that needs to look like to have
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a proper description of the lunar um for the lighting systems
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there is some uh got track this that is
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currently use but there's no standardisation opted for gas
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so this is where we are targeting to work on the standardisation procedure and to work on
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standards how to best describe the lighting systems
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um for for for socks and for building envelopes
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why do we need to um we've seen that uh quite some time today in the morning and not also
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that um uh and we'll simulations for day lighting are are more and more common and are also needed to do
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calculations of daylight autonomy of ali and and will um they let
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player probabilities things like that um and for that we obviously need something
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here we see that because they have a windows and no calculation methods
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we cannot do ray tracing for um every single our far of the eight
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thousand seven hundred sixty hours in the year so we need to have a
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efficient calculation methodology it's that metric space not that have been developed over the last years
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um and all these methodologies they needed description of today learning system via
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beast yes that that's either for the three phase not that we see here
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it's quite a rough a coarse resolution um or we can go
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for the do a detailed calculation in adding heading back a very um
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precise representation with the high priest solution because they have 'em into five this method would
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be see you so that's the application will we do need that and this is also
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i'm a part where we need some kind of standardisation we need the
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first thing is we need to say okay what is the kind of
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representation what is the resolution what is the data format that we
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need and uh on the other hand what is the kind of simulation
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methodology sent methods that we should use and algorithms that we should used
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to come up with different um evaluations and different they live in metrics
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what we did as a background for that ace um i ran a
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sensitivity analysis on different classes of the lighting system sent a facade systems
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so from click placing or venetian blinds or daylight
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redirecting systems like directing films um or shapes fabrics
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um we did a a a whole bunch of simulation studies on that
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i'm investigating how various resolutions how various um
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data sets for this for the same system influences the results um either here for example
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i'm doing a a calculation and vertically luminance that gets high
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which is the basis for the chippy did they like their probability calculation
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or also the main basis for um calculating non visual effects of like
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so we see it like pick two examples of for example some of that
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sensitivity analysis for example i'm representing clique leasing free b. s. d. f. either
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compared to geometry so this is the ground truth that we're having
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with um a very rough resolution with lines or a very finders solution
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and we see that there are situations out there where we get quite a
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big difference so if we look at that i'm in a in a bar chart
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we see that for example in in march we get quite some variation in the and
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and medically luminance values which you also see into um it should be in the and um
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looking looking uh to that also from the other side we don't have the direct sun in your in the view
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um and here we are for example in the part where that the main reaching for a like a probability somewhere between
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zero point three five and two point four five um wait
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really changes between discomfort um uh uh situations and comfort situations
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and we exactly here in d. c. variation so doing dave relation with two different groups
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annotations of the system might and in a very different um evaluation of the overall scenario
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i'm also doing that for the nation blinds there
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are some some outliers as well we see for example
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here we have the representation that just over estimates by
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far to clear potential of that system so if you
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by accident choose this kind of representation of the system you
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might just get a very wrong um insulation of your situation ups
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um so from that we try to put the data for which kind of
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classes of system one for which i'm methodology we should use um which kind of
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use the f. description to ah quite some established format out there at the moment
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um different in resolution uh to use the different kind of softer different institutions um
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they are currently let's let established methods but they are not standardised yep
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and um what we need to come up with in the end is to
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have for every single class of systems what i should be for is for like
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pick that we should lines here we have different simulation task that
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we wanna do if we only want it calculated to lead factor
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um that means we're using a a overcast sky model for the simulation
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um we don't need a very high resolution file system to to
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perfectly simulate but for example if you go down to a point
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in time clear metric calculation which means that is illuminate space calculation
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we need a very high and very fine resolution for the system
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um so this connections and does some into relations
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we need to define for all kind of different
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systems that are out and of all classes of systems
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um so will we will start with those six some classes
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that so we we clustered into transparent systems it's
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no matter of clear all electronic playthings or films
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i'm from the point of view from the characterisation through pierced yes it's the same it's you have a very strong
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see through component um and for that we are here
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can be class that and the same can be you
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this all any n. should go uh and we'll go into
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the revision of that ice a standard uh ten nine sixteen
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there's um it's that calculation of the impact of the lighting on the energy useful lighting
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into is already a daylight calculation methodology define their how to do that and this will
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be updated to include and no calculation and with that we also need to specify how
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can systems how can they let systems be um incorporate in b. p.
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a simulated within this calculation methodology um there is a
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task force i'm not working on this within the i. so
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and that's in in close collaboration with r. i. e. a. um task group
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so this um task or this this update of this uh ice a standard should be out within the
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say next one and a half or two years um and then says then we really
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want to try to have a a clear specification which kind of used to have to use
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for which simulation task and for which um they liked last
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i'm a short thanks to the funding agencies in austria and i'm happy to take questions
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