To investigate the effectiveness of daytime natural ventilation and night mechanical ventilation on indoor thermal environment, a university library in Hunan Province was selected as object of study. The indoor hourly temperature and invalid time were simulated by Energyplus on daytime natural ventilation and different night mechanical ventilation. The results show that the invalid time of April, May, June, September, and October are 64 h、138 h、333 h、290 h 和 99 h respectively. When it increase night mechanical ventilation of 5 n/h, indoor t...
