SoftSimConsult Ltd

Stack Effect

Modelling and Analyses

Stack Effect assessments are important for any tall building and moreover in regions with extreme weather conditions. Main aim of the study is to derive the differential pressure to all internal and external doors and operable windows. All main access points should be within acceptable levels of differential pressure in order the guarantee normal operability of all access points. This is completed by improving the building design with introduction of vestibules, mechanically operated doors, introduction of revolving doors, etc.

The main objectives of the stack effect assessments are:

• To understand the air infiltration and exfiltration through the building envelope and point to design weaknesses and construction element specifications.
• To understand internal airflow patterns and flow paths within the building and to mark all access locations that could experience excessive differential pressure levels.
• To derive detailed indoor environment data under different ambient conditions to support the MEP engineers in the optimisation of air conditioning and ventilation systems.
• To assess different mitigation measures to overcome the negative stack effect impact.

Stack Effect Diagram