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 therefore able to buffer moisture.In combination with highly insulated and airtight but vapour permeable building envelopes,modern earth-timber constructions provide stable relative humidity levels indoors 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 unhealthy and uncomfortable.The application of building materials being poor of 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,however,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 nighttime ventilation in summer,vapour active earth-timber constructions provide evaporative cooling(humidity adsorption at nighttime 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.
indoor environmental quality climate control through natural materials natural ventilation
Andrea KLINGE Eike ROSWAG-KLINGE Christof ZIEGERT Patrick FONTANA Matthias RICHTER Johannes HOPPE
Roswag Architekten,Germany Ziegert Seiler Ingenieure,Germany Bundesanstalt für Materialforschung und -prüfung(BAM),Germany
国际会议
2017世界可持续建筑环境大会(the World Sustainable Built Environment Conference)
香港
英文
2811-2817
2017-06-05（万方平台首次上网日期，不代表论文的发表时间）