Polarbear Building: Solar thermal system with textile membranes in combination with an innovative heat storage system

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1 INNOVATIONS FROM NATURE Polarbear Building: Solar thermal system with textile membranes in combination with an innovative heat storage system Thomas Stegmaier, Jamal Sarsour, Heinrich Planck TUD Workshop Shaping Cities for the New Challenges Wien, March 2013 Supported by the Ministerium für Umwelt, Klima und Energiewirtschaft of the state of Baden-Württemberg, Germany and the European fund for regional development

2 State of the art Textile membrane constructions have typical properties: material efficiency light weight transluzenzy mobil but insufficient heat insulation demand on heat insulation, energy harvesting Aim Light weight, textile buildings for conditioned rooms in combination with solar thermal energy harvesting

3 Energy supply in great amount sun as energy source / global radiation in Germany kwh / day m² Munic 3,2 Hamburg 2,6 East sahara 7,0 energy densitiy at equator - average: W/m² average yearly sun radiation in kwh/m² source: DWD

4 Polar bear Natural archetype: Fur and skin of the polar bear Technical relevant characteristics: dense heat insulated fur with colourless hairs black epidermis with absorber function => heat losses only through eyes and mouth Polar bear (Ursus maritimus) black skin of polar bear limited heat losses

5 Bionic inspired transparent heat insulation on textile base with selective coating (Infra Red reflection) transparent heat insulation absorber air heat insulation

6 Energy independant building: Polar Bear Building sun radiation Aim of development: multi functional skin systems with fiber based materials long time heat energy storage system use of sun energy energy management heat energy storage TAO-Trans-Atmospheric Operations GmbH

7 Energy concept sun radiation outer skin radiation permeable insulation heat transporting layer for air absorber: heated up by radiation inner insulation insulation ventilation thermo chemical storage

8 Calculations assumptions for solar active roof solar radiation W/m² (sunny summer days in europe) one dimensional radiation/heat exchange in channels (e.g. 50cm width, 5m length, 2cm hight), air temperature 140 C at 20 ambient temperature after collector of 5 m with W/m² sun radiation

9 Calculations Calculations for storage storage material: sorption storage (suitable for C desorption temperature) 60 kg silicagel per storage tower (dry weight) resulting in: max. 25% weight loading max. adsorption enthalpie 625kJ/kg = 0,174 kwh/kg heating with 100% humidity in air temperature increase up to 25 K at exit of storage system for heating produced heat is transfered by heat exchanger from process air to fresh ambient air

10 Upscaling in different steps

11 Analysed flexible solar thermal systems 3-layer-system: - transparent temperature-resistant foil / - black spacer warp knitting / - black absorber fabric - heat insulation 5-layer-system: - transparent temperature-resistant foil / - with spacer warp knitting / - transparent temperatue-resistant foil / - black spacer textile / - black absorber- fabric - heat insulation

12 Result of experimental analyses 160 air temperature [ C] ,1 m/s 0,2 m/s 0,3 m/s 0,4 m/s Start 10min 20min 30min 40min 50min 60min radiation time W/E10/800W/m²h

13 Setup of 10m experimental channel in Filderstadt - how fixing the distances of layers? - how span? - efficiency? - lack air by sucction!

14 Function of energy storage system concept sorptions-storage-heating energy storage (loading/drying): Hot heat dryed air advantage: longtime storage time (seasonal storage) wet air, loss of water in storage material and cooling of air by desorption Energy gain Energy transfer energy output (heating): dry, warm air wet cold air, add of water in storage material, heating of air ab absorption Energy transfer

15 concept collector storage collektorline collector line Collector line Isolierte Leitungen für den Wärmetransport LOADING storage module storage module STORAGE Hot air Speicher Speicher Speicher Modul Speicher Modul storage Modul Modul module HEATING storage storage module module Outside air or inner air Vent. Inner air Outside air

16 location building position

17 Polar Bear Building Polar Bear Building: cross section from east

18 Polar Bear Building Polar Bear Building: view from south

19 Polar Bear Building Polar Bear Building: view from north

20

21

22 High thermal insulation of textile skin

23 Solar thermal energy harvesting in winter time

24 Benefits, success Social benefits Environmental friendly, sustainable Strengthen of solar thermal energy use Strengthen of region Economical benefit new market for energy harvesting flexible roofs and facades worldwide Top engineering planning Manufacturing of roof and wall areas Make up and setup Innovative energy concept for a worldwide market Innovations Membrane with heat transport skin Membrane as energy producer Use of sorption storage system for free of loss heat storagie

25 Support Support program Main focus of support program Suport - EFRE - state Volume of invest Environmental technology Ministerium für Umwelt, Klima und Energiewirtschaft Innovation, knowledge based economy and cluster Euro Euro Euro 1,4 Mio. Euro

26 Companies involved: Construction companies: Lageplan: Schnurgerüst: Erdarbeiten Stahlbeton: Erdanker: Stahlbau: Holzbau: Seilnetz Werkplanung: Seilnetz: Vermessung Hils Vermessungsbüro Volles Flachs Bauunternehmung Glienke Gerätebau GmbH Metallbau Zeh Sanders Tischlerei Officium, Design Engineering Carl Stahl GmbH Material producers ETFE foil: Membrane: Textile: Nowofol Serge Ferrari Friedola

27 Thanks to: Ministerium für Umwelt, Klima und Energiewirtschaft Baden-Württemberg European Union Projektträger Karlsruhe (PTKA-BWP) L-Bank Project partners: TAO-Trans-Atmospheric Operations GmbH

28 Thanks for your attention! Dr. Thomas Stegmaier Tel.: +49 (0)7 11/ Fax: +49 (0)7 11/ Körschtalstrasse 26 D Denkendorf Supported by the Ministerium für Umwelt, Klima und Energiewirtschaft of the state of Baden-Württemberg, Germany and the European fund for regional development

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