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ur society is today in a phase of development in environmental and sustainable thinking. Alarming reports show changes in climate caused by our load and exhaust of resources. The energy usage contributes to a big part of it, by its emission of carbon dioxide. The built environment uses around 40 % of the total energy consumption in Sweden and requests to strongly reduce it are presented from both EU and national level. This thesis brings up the subject of green building with a focus on how we can create more energy efficient buildings in projects of new construction. Since the construction industry today often fails to pass on the knowledge between different projects, as a return of experiences, the construction company Skanska suggested the topic for this thesis. The purpose was to study modern green solutions, used in different reference projects to collate and pass on the knowledge and experiences from both production and usage of the solutions, to indemnify the quality of them for energy efficiency. Five green solutions were selected:  Green lighting installation  Solar shields for facades of glass  Heat recovery with MVHR-system  Demand controlled systems  Wall and terrace solution with insulation of PIR.   The different solutions were at first studied theoretically and then, if possible, at the site of the project. Interviews were made with adequate people in the production and the intent with the thesis was to find out experiences of the chosen projects. Since the numbers of eco-certified buildings are increasing, an aim to link the different solutions with certifying systems rose, foremost towards the LEED system (Leadership in Energy and Environmental Design) – in line of Skanska’s environmental initiative. The result from the study of green solutions shows that green thinking and interests of energy efficiency by costumers – of economical or environmental reasons – are increasing. The review also shows the fact of green solutions requires economic investments, but a relatively short payoff time can be earned by reduced costs of energy savings. Trends are affecting how we build, which may not always be at the best from an environmental viewpoint. But the fact is that even if large glass

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Energy and environmental demands regarding buildings have become an increasingly discussed topic, both in Sweden and in Europe as a whole. The general trend indicates that greater efforts are being put into the energy efficiency of the built environment. There are already numerous examples of houses with a low energy demand, and the number of low energy buildings is constantly growing. At the time being, the maximum level for energy demands for housing in Stockholm is 110 kWh/m 2year, but as soon as next year the limit will be changed to 90. The Swedish agency Energimyndigheten is currently conducting a project to interpret the EU Directive on the so-called Nearly zero energy buildings, and the preliminary results indicate that the level of requirements for purchased energy will end up with about 55 kWh / m 2year, which is in line with today’s recommendationsfound in FEBY's Kravspecifikation för Passivhus. Starting with a low-energy house in Henriksdalshamnen in Stockholm, we have analyzed various energy-efficiency measures and their influence on power and energy needs. The financial aspects associated with the measures have been studied using a model of life cycle costs. The measures were initially studied individually to give an idea of how much impact they each had. Three packages of measures were then put together, where the most energyand cost-effective solutions were included. The first package of measures aimed to achieve the standard for Passive houses, and was accomplished by the replacement of windows and an improvement in airtightness. The economic analysis showed that this package was not viable. The second package of measures aimed to as much as possible reduce the building's energy needs and at the same time demonstrate profitability. The results showed a more than halved energy demand and the economic calculations indicated that it even turned a profit. Finally, the possibility of installing energy-producing systems in order to achieve a plus energy house was studied. The idea was to examine whether it was possible to cover up the need for purchased energy by using solar and wind power, while maintaining profitability. The analysis shows that this would be difficult to achieve, primarily because of the high investment costs entailed, and the difficulties associated with the regulations regarding the sale of energy.

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<p>NR 20140804</p>

<p>NR 20140804</p>

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