Determination of outdoor design conditions

Presents the method for determining outdoor design conditions in GB 50736—2012 Code for design of heating ventilation and air conditioning of civil buildings with focuses on the difference of determination methods between China and some developed countries, the selection principle of meteorological stations and the determination thought of the data statistic period. Analyses the variation regularity of meteorological data: the design temperature in winter becomes higher with obvious variances while for most cities the design temperature in summer rises with smaller differences, and for some other cities the temperature reduces to a certain degree.