ETFE Membrane Facade Funtzio Nagusia: Kanpo-azal Bikoitzeko Fatxada by Petr Franta

ETFE Membrane Facade Funtzio Nagusia: Kanpo-azal Bikoitzeko Fatxada by Petr Franta is a highly esteemed winner of the very prestigious 2022 Brontzezko Saria A' Design Award in Arkitektura, Eraikin eta Egitura Diseinua Competition Category.

BrontzeArkitektura· 2022

ETFE Membrane Facade Funtzio Nagusia: Kanpo-azal Bikoitzeko Fatxada

by Petr Franta

Client: Ctu

Brontzezko Saria A' Design Award Winner in Arkitektura Category

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The Design

About ETFE Membrane Facade Funtzio Nagusia: Kanpo-azal Bikoitzeko Fatxada

Testu Liburua: ETFE Mintzazko Fatxada ikerketa eta irakaskuntzarako eraikin baterako diseinatutako kanpo-azal bikoitzeko fatxada da. Kanpo-azala etilenozko tetrafluoroetilenoz egindako koltxoi gardenez osatuta dago, soldatuak, hiru metroko zabalera eta hirurogeita bi metrora arteko luzera dutenak, etengabeko aire-presiopean mantenduak eta diagonalean instalatuak bigarren mailako altzairuzko egitura batean, aluminiozko grapen bidez. Fatxadaren barrunbeak eguzki-biltzaile gisa jarduten du, eta aire beroa aireztapen-unitateetara eramaten da, energia-erabilera %30era arte murriztuz. Mintza euri-urarekin garbitzen da eta kaleko trafikoaren aurkako babes akustikoa gehitzen du.

The Recognition

About the Brontzezko Saria A' Design Award

ETFE Membrane Facade Funtzio Nagusia: Kanpo-azal Bikoitzeko Fatxada Brontzezko Saria A' Design Award irabazlea da, sormenak, asmamenak eta zorroztasunak bereizten dituzten diseinu bikainei ematen zaien aitorpen oso prestijiotsua. Brontze-mailako irabazleak trebetasunez beteriko eta nabarmenki sortzaileak diren artefaktuak dira, beren diseinatzaileen esperientzia zabala, irudimena eta ekimena egiaztatzen dutenak. ETFE Membrane Facade Funtzio Nagusia: Kanpo-azal Bikoitzeko Fatxada oso estimatua, miretsia eta maitea den objektua izatea espero da, nabarmenki profesionala eta berritzailea dena. Brontzezko Saria A' Design Award irabazi duen diseinu honek artearen, zientziaren, diseinuaren eta teknologiaren praktika onenak biltzen ditu eta xehetasunei ematen dien arretagatik bikaina da. ETFE Membrane Facade Funtzio Nagusia: Kanpo-azal Bikoitzeko Fatxada beharrak bikain asetzen dituen, desirak ukitzen dituen, sentimenduak xarmatzen dituen eta jakin-mina erakartzen duen lana da.

Behind the Design

Press Kit

Credits, team members and technical details provided by the designer.

Unique Properties: Applying Double Skin Facade with ETFE Ethylen Tetrafluor Ethylen transparent membrane assembly for energy saving up to 30 percent. Acting as solar collector with recuperation of hot air on the top floors in winter season.
Additional acoustic protection on busy traffic streetscape.
Aesthetics, added value as large span between structural members.
Self cleaning exterior of the facade ETFE membrane with additive chemical component rejecting dirt as automatic cleaning of the facade with rain water.
Dimensions & Packaging: Pneumatic ETFE membrane cushions are 3 m wide and up to 62 m long, installed diagonally and kept under constant air pressure 300 Pa.
Cushions are anchored on secondary structural steel system with aluminium extrusion clamps structurally designed for wind load.
Acoustical properties in combination with triple glazing system 47 dB adds 10 dB to 57 dB in composite calculation.
Area of ETFE membrane facade is divided in two parts 1294 m2 and 570 m2.
Height of facade 20 m. Length of facade is 68 and 30 m.
Tags: ETFE, Ethylen TetraFluor Ethylen membrane, Double skin pneumatic facade,
Production Technology: 3 m wide ETFE Ethylen Tetrafluor Ethylen cushions in south and west facade with seam in aluminium profiles on the secondary steel structure are welded cushions and kept under constant air pressure 300 Pa.
Weight is 1% of glass installation of outer skin.
Recuperation of hot air from facade as solar collector, energy saving up to 30%.
Self cleaning exterior ETFE membrane with additive chemical component rejecting dirt cleaning of the facade with rain water.
ETFE 50-years lifespan of the material.
Design Challenge: Turning of the corner of diagonally placed pneumatic cushion of ETFE membrane detail in double skin facade.
Special aluminium extrusion detail was developed (with live size models) especially for this project to allow the twisting diagonal clamp with 1000 mm radius, placed on secondary steel tubing. We had to comply with European standards DIN different for aluminium and steel. Large mock-ups, samples and models were part of the design process to make sure that the membrane does not wrinkle.
Research: Design research was very complex with scientists, structure engineers in applications ETFE membrane around the world (London, Munich, New York) - design datas with manufacturers, designers.
We searched design and structural properties of Ethylen TetraFluor Ethylen transparent membrane facades for building types use, duration in life span, wind load on pneumatic cushions, aluminium clamps detailing, secondary steel structure detailing, transparency properties, weight, width versus span dimensions.
Inspiration: Presentation of 8 x 6 m sample of ETFE membrane cushion with pneumatic equipment for Allianz Arena in Munich by Herzog De Meuron Architects. It was used for football stadium, in England for museum in Leicester by Nicolas Grimshaw and other non transparent use. After researching those study cases around the world, later came to me the idea to use transparent double skin membrane for office type building for scientists, using transparent film membrane in double skin facade instead of glass.
Project Duration: Project design started in 2008 in Prague with presentation to Technical university scientists committee.
Realized in years from 2015 to 2017 on Czech Technical University in Prague campus for Czech Institute of Informatics, Robotics and Cybernetics of the CTU in Prague.
Operation Flow: Applying double skin facade with ETFE membrane assembly for energy saving with recuperation of hot air on the top floors, saves 30 percent of an energy consumption.
From double facade acting as solar collector hot outside air is sucked into the ventilation HVAC units on each floor from two places - from south facade for the winter and transition period and from the north facade in the summer. (Solar collector - double facade between the glass facade and the outer facade of the ETFE facing south).
Patents: Design of pneumatic cushions fasade with ETFE Ethylen TetraFluor Ethylen trademark Taiyo Europe.
Team Members: Architect: Petr Franta
Architect: Stepan Sekera
Architect: Petr Sobotka
Image Credits: Image #1 Photographer Jiří Ryzsavy
Image #2 Photographer Jiří Ryzsavy
Image #3 Photographer Jiří Ryzsavy
Image #4 Photographer Jiří Ryzsavy
Image #5 Photographer Jiří Ryzsavy