Page 41 - ZEB AnnualReport 2015

hand, a double-glazing with aerogel illing energy for space heating. This is due, as lifecycle emissions for a residential building
with a similar U-value has a g-value of 0,75, explained above, to the high solar radiation located in Norway.
which means a window with the same thermal through aerogel windows.
insulation property and higher transparency. For å få bukt med den lave termiske
This is very favourable, as a high g-value The calculation of the lifecycle of greenhouse motstanden i transparente overlater er det
allows for high solar radiation, which in winter gas emissions showed that the building utviklet vindustyper med lere lag glass,
is beneicial for reducing the energy required lifecycle emissions decrease by 9% when hvorav et bredt utvalg er tilgjengelig i dagens
for space heating. the aerogel windows substitute triple-glazed marked. Trelags vinduer med lavenergibelegg
windows. In igure 3, the comparison og argongassfylling er eksempel på en effektiv
However, it must be noted that depending between the use of either aerogel windows energispareløsning. Disse teknologiene har
on the form of the inal product (powder or or triple-glazed windows represents the imidlertid den ulempen at de, som følge av de
monolith), the optical properties of aerogel most signiicant results (space heating, total mange lagene med belegg, drastisk reduserer
varies. While monolithic aerogel shows a building energy use, and building lifecycle andelen solstråling som trenger gjennom
visible transmittance which is comparable to emissions). The values are obtained by glasset. Dette kan være ugunstig på nordlige
glass, granular aerogel shows much lower dividing each result given by the use of breddegrader (som i de skandinaviske
values of visible transmittance, as the material aerogel windows by the same result given by landene) der solstrålingen i vinterhalvåret er
is translucent. In such a perspective, the use the use of triple-glazed windows. In the irst liten både med tanke på tilgjengelighet og
of granular aerogel in residential buildings column the different windows types (granular lyskvalitet. Glass med aerogelˆ er fremmet
may have a limited application due to its aerogel, monolithic aerogel, and triple-glazing) som en teknologi med evne til både å
translucent appearance. and the different glazing ratios (amount of slippe inn mer dagslys og med en bedre
glazed area/total facade area) are shown. It isolasjonsverdi enn tradisjonelle vinduer med
The energy simulations showed that the is possible to conclude, from the results of tre- og irelags glass. Resultatene presentert
substitution of triple-glazing with argon gas this study, that the use of aerogel windows her sammenligner og vurderer utslippene av
with aerogel glazing (either monolithic or is beneicial for the reduction of the building drivhusgasser (GHG) fra tre ulike teknologier

granular) saves up to 20% of the delivered energy need for indoor space heating and the benyttet ved renovering av et boligkompleks

Figure 1. Top left and centre: the West and East façades of the test building, the Myhrerenga Borettslag before renovation. Top right: the original drawing of the
cross section of one the apartment buildings. From Lolli, N., Life cycle analyses of CO2 emissions of alternative retroitting measures, Ph.D. Thesis, Norwegian
University of Science and Technology, 2014.

ZEB annual report 2015 41