Super High-Rise Buildings and Comfortable Natural Ventilation

Jie Zhang
Director, Partner
EFC Engineering Consulting Company, Ltd, Shanghai

As populations increase, the height and density of buildings is increasing along with it. However, a large number of high-rise buildings use fixed windows and mechanical ventilation facilities, and as a consequence, people in high-rise buildings are unable to enjoy as much natural ventilation. One of the reasons is that high altitude often comes with high wind speeds, which increases the risk of hardware damage and the possibility of falling from an operable window. The wind field around the high-rise building changes greatly, and it is difficult to get low speed, stable and comfortable natural wind in a high-rise building. The second reason is energy consumption. Because of the stack effect in high-rise buildings, openings at the bottom and the top of high-rise buildings may lead to huge energy consumption in winter and summer. In order to reduce energy consumption, the curtain wall component must be airtight. This also limits the use of natural ventilation elements such as ventilators, whose permeability performance are not as good operable windows.

This presentation references the New Development Bank as a case study. Through the analysis of many possible methods of natural ventilation, combined with the performance of daylighting and sun shading, this presentation makes a case for the benefits provided by natural ventilation of super high-rise buildings, and.explains some design strategies that can increase natural ventilation.

Accompanying PowerPoint Presentation