A simplified prediction model was developed to predict indoor thermal environments in atriums with openings. Characteristics of cross ventilation through openings were studied using CFD technique based on the standard k-ε model. According to the simulation results under several conditions modeling strategies were obtained to predict draft airflow volume, inlet airflow angle and the airflow state in atriums. Finally, a simplified prediction model was developed as a computer softwere to calculate indoor thermal environments in atriums with openings. Predicted results on temperature distribution using this software showed a good agreement with CFD results, and it was verified that developed model provides acculate predictions on indoor thermal environments.
