Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Evaluating building envelopes for energy efficient buildings : Energy- and moisture performance considering future climate change
Buildings account for a signifi cant proportion of the energy use thatgenerates greenhouse gases and consequently drives the ongoing climatechange. As the population of the world increases, the need for buildingsincreases, while the energy use needs to decrease. A reduction in energyuse and increased use of renewable energy are important measures forclimate change mitigation. A fi rst step in decreasing the energy use of abuilding in a Nordic climate is to increase the thermal resistance of thebuilding envelope.The combination of climate change and more insulation in buildingelements will result in a different microclimate within the building elements. External parts in well-insulated building envelopes will have amicroclimate more similar to the exterior climate as the thermal resistanceincreases and moisture may take a longer time to dry out.Today, there are several established ways to calculate and quantify theenergy performance of buildings and building components. As regardscalculation of transmission heat transfer through building envelopes, thereis a lack of knowledge among Swedish engineers and architects. Thereare ambiguities regarding the defi nition of a thermal bridge and the waybuilding elements are quantifi ed in energy calculations.There are models to quantify the moisture performance of a buildingelement, where the focus is to evaluate the risk of mould growth. Regarding other moisture-related problems, such as corrosion, deformations etc.,critical moisture levels are established. However, these levels are not validfor short-term loads. Only models of mould growth take into accountfl uctuations in hygrothermal conditions.Traditionally, durability and robustness of building elements are basedon experience and are not specifi ed in quantitative terms. However, increasing the thermal resistance in combination with climate change will result indifferent hygrothermal conditions within the building envelope. Buildingelements needs to be designed with reference to these aspects.To enable evaluation of ...
Evaluating building envelopes for energy efficient buildings : Energy- and moisture performance considering future climate change
Buildings account for a signifi cant proportion of the energy use thatgenerates greenhouse gases and consequently drives the ongoing climatechange. As the population of the world increases, the need for buildingsincreases, while the energy use needs to decrease. A reduction in energyuse and increased use of renewable energy are important measures forclimate change mitigation. A fi rst step in decreasing the energy use of abuilding in a Nordic climate is to increase the thermal resistance of thebuilding envelope.The combination of climate change and more insulation in buildingelements will result in a different microclimate within the building elements. External parts in well-insulated building envelopes will have amicroclimate more similar to the exterior climate as the thermal resistanceincreases and moisture may take a longer time to dry out.Today, there are several established ways to calculate and quantify theenergy performance of buildings and building components. As regardscalculation of transmission heat transfer through building envelopes, thereis a lack of knowledge among Swedish engineers and architects. Thereare ambiguities regarding the defi nition of a thermal bridge and the waybuilding elements are quantifi ed in energy calculations.There are models to quantify the moisture performance of a buildingelement, where the focus is to evaluate the risk of mould growth. Regarding other moisture-related problems, such as corrosion, deformations etc.,critical moisture levels are established. However, these levels are not validfor short-term loads. Only models of mould growth take into accountfl uctuations in hygrothermal conditions.Traditionally, durability and robustness of building elements are basedon experience and are not specifi ed in quantitative terms. However, increasing the thermal resistance in combination with climate change will result indifferent hygrothermal conditions within the building envelope. Buildingelements needs to be designed with reference to these aspects.To enable evaluation of ...
Evaluating building envelopes for energy efficient buildings : Energy- and moisture performance considering future climate change
Berggren, Björn (Autor:in)
01.04.2013
Hochschulschrift
Elektronische Ressource
Englisch
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