Potential of natural ventilation using upper openings in a large space building

Establishes a stack effect model for large space buildings, calculates the air rate and total heat transfer of the natural ventilation driven by stack effect and upper openings in a typical large space building under different climates of Nanjing, Wuhan and Chongqing, and determines the minimum upper opening areas to meet the requirements of the standard ventilation. Taking Nanjing as an example, measures the temperature stratification in a large space building in September. Simulates the indoor mean temperature of each month and the building cooling loads considering the temperature stratification by EnergyPlus software. The results show that the indoor thermal comfortable hours in May, June and September are more than those in other months, with about 300 hours in each month. In June and September, the heat transfer of natural ventilation is negative in Nanjing, so it is necessary to adopt a suitable natural ventilation strategy to control indoor comfort and save energy.