Discussion on outdoor air design conditions for summer air conditioning

According to the outdoor meteorological data of China, compares the difference between the humidity ratio calculated based on annual dry-bulb and wet-bulb temperature under the condition of not guaranteeing 50 hours everage per year and the annual statistical humidity ratio under the condition of not guaranteeing 50 hours everage per year. Comprehensively considering the influence of outdoor conditions on indoor thermal environment and the air handling process of different equipment, suggests that corresponding outdoor design conditions should be selected according to different influence factors in air conditioning design. Using the meteorological data from 1971 to 2003 by the China Meteorological Bureau, gains three design indices of 31 China’s main cities in which dry-bulb, wet-bulb and dew-point temperature are respectively used as a key factor.