Abstract
Indoor environment affects human’s health directly. In residential buildings, natural ventilation can be applied as an effective
way of ventilation. Different window-opening behavior results in different indoor environment. Five window-opening behavior
of a common residential building in Changsha were compared and analyzed by using Airpak. Energy consumption of building
with different orientation was calculated by DesignBuilder according to the Changsha typical meteorological data. A new
evaluation index was proposed to compare the design schemes with consideration of the performance of natural ventilation and
the building energy consumption. The optimal scheme combination of the building orientation and the opening’s position was
obtained by the index