VDI 4710 Blatt 4:2015-09

This standard allows to specify design points (summer and winter) for air temperature, water vapour content, and enthalpy, to be used in the calculation of heating, ventilating and air-conditioning (HVAC) systems in Europe, and can serve as a basis for the analysis of annual energy consumption according to the individual-frequency method. In addition to information regarding the correlations between the air temperature and the water vapour content, a wind statistic including wind speeds and wind directions is provided for each station, thus delivering insight into any non-standard heat transfer conditions to be expected. At the suggestion of REHVA, a compilation of data from 122 stations in Europe, allowing the same processing quality in the vicinity of the stations as for the German stations, is presented here on the basis of the same time period as for Germany (1991 to 2005). For these 122 European stations, the same procedure and basic analysis have been chosen. It is a harmonised proposal which, although surely not meeting all national procedures of system design, provides a good synopsis of the respective climatic situation.