Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Life cycle optimization of extremely low energy dwellings
A global methodology has been developed to optimize extremely low energy buildings from the point of view of energy use, costs, and environmental impact. A large number of energy saving measures, both on the building envelope and on the heating installations has been taken into account. The focus of the analysis here presented was laid on the determination of the trade-off between energy use and costs over an usage period of 30 years. First, the results of this extensive research project reaffirmed the economic optimum and the hierarchy of energy saving measures that was already found in less extensive earlier work. Analysis of price evolutions also showed that the economic optimum is not only independent of these cost scenarios, it also remains economically viable for all analyzed cases. Also the hierarchy of energy saving measures appeared to be independent of these scenarios. Obviously, the economic viability of some measures, such as the application of heat pumps or mechanical ventilation with heat recovery, will depend on the cost scenarios, but in contrast to what is sometimes assumed, none of the scenarios causes a shift in the hierarchy of energy saving measures. Also concepts for extremely low energy dwellings have been determined, but none of them appeared to be economically viable for the current energy prices or discount rates. Only in case of much higher energy prices, some of these concepts will become cost-effective over 30 years. However, the largest barrier of all these concepts is the extremely high investment cost. Without financial support or incentives, these concepts will be limited to a small number of consumers with a high environmental consciousness that are willing to invest such a large budget in an extremely energy saving house. Finally, in contrast to what is sometimes commonly assumed, there is no reason for great concern about the embodied energy of the energy saving measures. The embodied energy strongly increases with increasing insulation level, but at the same time it leads to large energy savings during the usage phase of the building. Regardless of the applied insulation materials or installation systems, the energy payback time is extremely low for energy efficient dwellings and is mostly lower than 2 years.
Life cycle optimization of extremely low energy dwellings
A global methodology has been developed to optimize extremely low energy buildings from the point of view of energy use, costs, and environmental impact. A large number of energy saving measures, both on the building envelope and on the heating installations has been taken into account. The focus of the analysis here presented was laid on the determination of the trade-off between energy use and costs over an usage period of 30 years. First, the results of this extensive research project reaffirmed the economic optimum and the hierarchy of energy saving measures that was already found in less extensive earlier work. Analysis of price evolutions also showed that the economic optimum is not only independent of these cost scenarios, it also remains economically viable for all analyzed cases. Also the hierarchy of energy saving measures appeared to be independent of these scenarios. Obviously, the economic viability of some measures, such as the application of heat pumps or mechanical ventilation with heat recovery, will depend on the cost scenarios, but in contrast to what is sometimes assumed, none of the scenarios causes a shift in the hierarchy of energy saving measures. Also concepts for extremely low energy dwellings have been determined, but none of them appeared to be economically viable for the current energy prices or discount rates. Only in case of much higher energy prices, some of these concepts will become cost-effective over 30 years. However, the largest barrier of all these concepts is the extremely high investment cost. Without financial support or incentives, these concepts will be limited to a small number of consumers with a high environmental consciousness that are willing to invest such a large budget in an extremely energy saving house. Finally, in contrast to what is sometimes commonly assumed, there is no reason for great concern about the embodied energy of the energy saving measures. The embodied energy strongly increases with increasing insulation level, but at the same time it leads to large energy savings during the usage phase of the building. Regardless of the applied insulation materials or installation systems, the energy payback time is extremely low for energy efficient dwellings and is mostly lower than 2 years.
Life cycle optimization of extremely low energy dwellings
Lebenszyklusoptimierung der Niedrigstenergiehäuser
Verbeeck, Griet (Autor:in) / Hens, Hugo (Autor:in)
Journal of Buildings Physics ; 31 ; 143-175
2007
33 Seiten, 9 Bilder, 6 Tabellen, 43 Quellen
Aufsatz (Zeitschrift)
Englisch
Amortisierung , Bauingenieurwesen , Energieeinsparung , Gebäude , genetischer Algorithmus , Investitionskosten , Kosteneffizienz , Kosten-Nutzen-Analyse , Kostenstrukturanalyse , Lebenszyklusbewertung , Lebenszykluskosten , Methodenentwicklung , Optimalwert , Optimierungsmodell , Produktlebenszyklus , Simulation , Simulationsmodell , Systemoptimierung , Wärmedämmung , Wirtschaftlichkeit , Niedrigenergiehaus
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