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See detailEnergy consumption of non-retrofitted institutional building stock inLuxembourg and the potential for a cost-efficient retrofit
Hoos, Thorsten UL; Merzkirch, Alexander UL; Maas, Stefan UL et al

in Energy and Buildings (2016), 123(2016), 162-168

The public building stock of a country, consisting of schools, offices, accommodation facilities, single-and multi-family homes, accounts for a high consumption of electrical and heat energy. Therefore ... [more ▼]

The public building stock of a country, consisting of schools, offices, accommodation facilities, single-and multi-family homes, accounts for a high consumption of electrical and heat energy. Therefore, thisstock is often subject to actions with the goal of lowering this energy usage by increasing the efficiencyof those buildings. This is usually done by applying measures to the building envelope like insulationand/or new windows and by using a more efficient HVAC technology. But often, in the initial state, thecurrent energy consumption of such a stock is unknown or only known for single buildings. In this case,the calculation of energy and cost savings is either impossible or not exact. This paper shows a way toquantify and categorize the end-energy for heat use of the public building stock in Luxembourg, whichconsists of a gross area of 1.744 million m2. This analysis was carried out in cooperation with the nationaladministration of public buildings.A certain amount of sample buildings was analyzed and then separated into three groups of low,normal and high end-energy use. The boundaries of these groups were chosen according to literaturevalues, derived from European retrofit projects, which also served as the source for possible renovationcosts. This data was extrapolated to the whole stock. This information serves as a basis for future decisionsconcerning the retrofit of those buildings and makes a calculation of costs possible.As a result, the type of buildings with the highest potential for retrofit measures was identified. Schools,offices and accommodation facilities with a “high” consumption of more than 190 kWh/(m2a) show thehighest economic potential with retrofit costs of 0.04–0.08 D /kWh if their energy consumption is loweredto values of around 90–100 kWh. Other groups of buildings show higher costs of around 0.07–0.19 D /kWh. [less ▲]

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See detailMesstechnische Ermittlung der U-Werte von Altbaufassaden im Vergleich mit Typologiewerten für den Gebäudebestand
Hoos, Thorsten UL; Merzkirch, Alexander UL; Maas, Stefan UL et al

in Bauphysik (2015)

Die Wirtschaftlichkeit von Renovierungsvorhaben an Altbauten hängt im Wesentlichen von der erwarteten Wertsteigerung, der Miethöhe und den zu erreichenden Energieeinsparungen ab. Um diese Einsparungen zu ... [more ▼]

Die Wirtschaftlichkeit von Renovierungsvorhaben an Altbauten hängt im Wesentlichen von der erwarteten Wertsteigerung, der Miethöhe und den zu erreichenden Energieeinsparungen ab. Um diese Einsparungen zu berechnen, wird ein rechnerischer Vergleich zwischen dem aktuellen Verbrauch und dem Verbrauch nach der Sanierung angestrebt. Zahlreiche Studien zeigen auf, dass der rechnerische Energiebedarf von Gebäuden häufig von dem tatsächlichen Verbrauch abweicht. Dies gilt vor allem für vor 1970 errichtete Altbauten. Ein wichtiger Eingangsparameter der Berechnungsmethodik sind die U-Werte der Aussenwände, welche typischerweise vom Energieexperten vor Ort aus Typologien des Gesetzgebers für die jeweilige Wandkonstruktion ausgewählt werden. In dieser Veröffentlichung werden Mess- und Simulationsergebnisse von verschiedenen Wandtypen präsentiert. Die ermittelten Werte lagen zwischen 0.9 und 1,2 W/(m2K) und somit deutlich unter den in Luxemburg angenommenen Typologiewerten von 1,4 bis 2,1 W/(m2K). Die beschriebenen Abweichungen zwischen Energiebedarfsberechnung und tatsächlichem Energieverbrauch können somit zum Teil auf fehlerhafte Annahmen des ausstellenden Experten vor Ort zurückgeführt werden, welche sich an Typologiewerten orientieren. [less ▲]

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See detailWie genau sind unsere Energiepässe?
Merzkirch, Alexander UL; Hoos, Thorsten UL; Maas, Stefan UL et al

in Bauphysik (2014), 1(2014), 40-43

Member States of the European Union are obliged to present a calculation method and certificate for the energy performance for buildings according to the guidelines 2002/91/EG und 2010/31/EU. In ... [more ▼]

Member States of the European Union are obliged to present a calculation method and certificate for the energy performance for buildings according to the guidelines 2002/91/EG und 2010/31/EU. In Luxembourg it is obligatory to add the real final energy consumption to the certificate after 3 years. The measured real final energy consumptions and the calculated ones were compared for 125 single-family homes and 105 multi-family homes with 870 dwellings in total. The mean calculated values for single-family homes were 74 % higher, the mean calculated values for multi-family homes 103 % higher than the actual measured data. The older the buildings, the higher the deviations, as the input parameters, which were partly assumed and partly predefined, diverge between calculations and reality. Sensitive parameters of interest are the indoor room temperature, the U-values, the used assessment for thermal bridges and the air exchange rate. [less ▲]

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