CCHRB Events / Programs
Regular CCHRB Meetings:
CCHRB meets regularly at the  Petterino's Restaurant at 150 North Dearborn Street (corner of Dearborn and Randolph).  CCHRB meetings are open to its members and their previously registered guests only.

Date: Thursday April 13, 2017 from 6:00 to 8:00 PM 
          (Reception begins at 5:15 PM)

Presentation Title: Building Science – Methods to Manage and Mitigate Stack Effect in Super & Megatall Towers 

​Mehdi Jalayerian, PE 
Executive Vice President & Chief of Innovation
Chicago, Illinois

Tyler Jensen, PE 
Senior Associate
Chicago, Illinois

Presentation Abstract: 
​Stack effect is the movement of air into or out of buildings due to air buoyancy. Buoyancy is caused by a difference in temperature and humidity between the indoors and outdoors. Uncontrolled airflow and pressure related to stack effect always exists - especially in supertall and megatall towers - but is exacerbated by outdoor ambient conditions. This presentation reviews parametric simulation of stack effect conditions for realistic configuration of megatall towers. Stack effect will be reviewed parametrically to establish design basis considering a tower’s response related to geographic design conditions, envelope construction, lobby configuration, space pressurization, sky-lobbies, observation level access, and stairwell compartmentation. The financial and disruptive risks of stack effect can be effectively mitigated if analyzed holistically and addressed early in the design of supertall and megatall towers.  

CCHRB Annual Seminars:

Aerial of Yongsan Towers 
Architect: Adrian Smith and Gordon Gill 
© Adrian Smith + Gordon Gill Architecture

Chicago Committee on High Rise Buildings
Burj Dubai (image from SOM.COM)
Skyline of Chicago (photo by Abbas Aminmansour)