One of the options to increase the energy efficiency of buildings in the cooling season, is to extract heat from the building envelope during the night by natural or forced ventilation. The exploitation of this technique by architects and designers requires the development of guide lines and a predesign tool showing how the potential cooling power depends on the influence of opening sizes and positions and on the interaction with the thermal mass.
In order to speed up the development of health, energy-efficient buildings, the City of Stockholm has formulated a programme for the building of apartment houses. The programme describes the characteristics the buildings should possess in order to achieve the political objectives of energy efficiency, health safety and reduced impact on the environment. These characteristics are described in the form of general functional requirements which provide a good deal of freedom in the choice of technical solutions,.
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