Meteorological parameters in heating season of typical cities in northwest China

Based on the typical year data provided by the national meteorological observatory, fits the function expressions of outdoor temperature and total solar radiation quantity in overcast, cloudy, partly cloudy and clear days in Xi’an, Xining and Yinchuan. The functions and observed data are well matched. Taking Xi’an as an example，compares the basic heat load, which is obtained with the fitted temperature function, with that worked out using the steady-state method from the current regulation, showing that the former is about 60% of the latter.