Analysis of HVAC outdoor design conditions under background of climate warming—Based on Standard for weather data of building in Xinjiang

In order to improve the HVAC outdoor design conditions of buildings in Xinjiang, the Xinjiang local standard DB65/T 8024-2024Standardforweatherdataofbuildinghas been compiled. Based on the original meteorological data of 104 meteorological observation stations in Xinjiang, the compilation group statistically analyses the changes of outdoor design conditions of building HVAC system. The results show that the global warming causes the extreme minimum temperature of some cities in Xinjiang to increase by 5.23 ℃ and the outdoor design temperature for heating to increase by 3.67 ℃ compared with the statistical period from 1951 to 1980, and five cities and counties have shifted to warmer thermal design zones. The precipitation in Xinjiang from April to September accounts for more than 50% of the annual average precipitation, and 87 cities (or districts) and counties belong to dry climate zones, which are suitable for evaporative cooling technology. The outdoor design temperature for summer ventilation is affected by the time difference. The outdoor design temperature for summer ventilation at 17:00 in the hottest month in Xinjiang is about 4.33%-9.41% higher than that at 14:00, and 92 cities (or districts) and counties have the highest outdoor design temperature for summer ventilation at 17:00 in the hottest month. It is suggested that the monthly average temperature at 17:00 (Beijing time) in the annual hottest month should be used as the outdoor design temperature for summer ventilation in Xinjiang.