Application analysis on night mechanical ventilation in northern areas based on EnergyPlus

This paper analysed the energy consumption and economy of office buildings with night mechanical ventilation in Harbin, Beijing and Shenyang based on the energy-consumption software, EnergyPlus. The principle for night mechanical ventilation was given. And the application potential of office buildings with night mechanical ventilation in other areas was estimated. The results show that night ventilation greatly reduces cooling load, and it is more energy-saving and economical. In active cooling stage, the indoor thermal environment of night ventilation is much better than that in the conventional air-conditioning mode. It is about 60 days that night mechanical ventilation may be used in office buildings in Harbin. And it is about 70 days and 40 days for Beijing and Shenyang, respectively. Night mechanical ventilation may be used in office buildings in Urumchi and Lanzhou.