Ventilation: the situation in Switzerland.

Swiss topography is dominated by the Alps and the Jura in the north-west part and the most densely populated "Midlands" between the two. The climatic conditions vary in a very wide range both in temperature and solar radiation due to the different altitudes and the different climatic conditions north and sourth of the Alps.Accordingly there are roughly three climatic regions. Meteo data are available as hourly values from over 70 automatic meteo stations. Derived values for hand calcualtion methods are regularly published in Swiss technical journals. Design reference years 1981-90 for 16 typical stations are prepared and distributed by EMPA for several building simulation programs.