Naturally ventilated earth timber constructions
- Earth, timber, fibre boards and insulation materials based on wooden and other natural fibres offer a variety of properties beneficial for eco innovative constructions that are able to improve the energy and resource efficiency of buildings. Due to their porosity, natural building materials are vapour active and are able to buffer moisture. In combination with highly insulated and airtight but vapour permeable building envelopes, modern earth-timber constructions provide stable indoor humidity levels and can therefore be naturally ventilated while achieving highest energy efficiency standards. Experimental evidence suggests that monitored pilot buildings in Berlin do show healthy indoor air humidity levels (around 50%) in wintertime, while mechanically ventilated buildings demonstrate significantly lower values (around 25%), which have to be considered as uncomfortable and unhealthy. The application of building materials being poor in chemical emissions, particularly volatile organicEarth, timber, fibre boards and insulation materials based on wooden and other natural fibres offer a variety of properties beneficial for eco innovative constructions that are able to improve the energy and resource efficiency of buildings. Due to their porosity, natural building materials are vapour active and are able to buffer moisture. In combination with highly insulated and airtight but vapour permeable building envelopes, modern earth-timber constructions provide stable indoor humidity levels and can therefore be naturally ventilated while achieving highest energy efficiency standards. Experimental evidence suggests that monitored pilot buildings in Berlin do show healthy indoor air humidity levels (around 50%) in wintertime, while mechanically ventilated buildings demonstrate significantly lower values (around 25%), which have to be considered as uncomfortable and unhealthy. The application of building materials being poor in chemical emissions, particularly volatile organic compounds (VOC) and radon, improves the indoor air quality further, so that intermittent ventilation twice a day will be sufficient to provide healthy indoor air quality. The air quality in critical rooms (e.g. small bedrooms), demonstrating a smaller air volume, should be monitored if appropriate ratios of room size to occupancy level cannot be realised. Through night time ventilation in summer, vapour active earth-timber constructions provide evaporative cooling (humidity adsorption at night time and desorption during the day). As a result, indoor temperatures of earth-timber buildings range around 8 °C below the outside temperature peak, when an appropriate glazing ratio is reflected. The EU funded research project H-house is investigating various construction materials regarding water vapour adsorption as well as emission and absorption of harmful substances. Based on this investigation new wall constructions are designed to provide a healthier indoor environment.…
Autor*innen: | A. Klinge, E. Roswag-Klinge, C. Ziegert, Patrick Fontana, Matthias RichterORCiD, Johannes Hoppe |
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Persönliche Herausgeber*innen: | G. Habert, A. Schlueter |
Dokumenttyp: | Beitrag zu einem Tagungsband |
Veröffentlichungsform: | Verlagsliteratur |
Sprache: | Englisch |
Titel des übergeordneten Werkes (Englisch): | Expanding boundaries: Systems thinking for the built environment - Sustainable Built Environment (SBE) |
Jahr der Erstveröffentlichung: | 2016 |
Herausgeber (Institution): | ETH Zürich |
Verlag: | vdf Hochschulverlag und der ETH Zürich |
Verlagsort: | Zürich |
Erste Seite: | 674 |
Letzte Seite: | 681 |
DDC-Klassifikation: | Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten |
Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Sanitär- und Kommunaltechnik; Umwelttechnik | |
Freie Schlagwörter: | Airtight building; Building materials; Climate control through building elements; Hygroscopic earthen and wooden materials; Low emissions; Natural ventilation |
Veranstaltung: | Sustainable Built Environment (SBE) Regional Conference - Expanding Boundaries: Systems Thinking for the Built Environment |
Veranstaltungsort: | Zurich, Switzerland |
Beginndatum der Veranstaltung: | 15.06.2016 |
Enddatum der Veranstaltung: | 17.06.2016 |
DOI: | 10.3218/3774-6 |
ISBN: | 978-3-7281-3774-6 |
Verfügbarkeit des Dokuments: | Datei im Netzwerk der BAM verfügbar ("Closed Access") |
Datum der Freischaltung: | 25.08.2016 |
Referierte Publikation: | Ja |
Datum der Eintragung als referierte Publikation: | 05.05.2017 |