San Francisco Federal Building - California (USA)

Work Performed

Design of the natural cross-ventilation system: airflow analysis, definition of the window geometry, opening area.

Definition of the building management system control rules.

Relevant Details

Tall buildings such as the new San Francisco Federal building present new challenges to natural ventilation design and energy efficiency.

In this building, wind-driven cross ventilation will be used in most of the floor plan in floors 6-18. The building volume that is cross-ventilated measures approximately: 107x19x52 m, starting at an elevation of 20 m.

The success of the natural indoor climate control system in this building will affect the working environment of a large number of people and may lead to the increased use of natural ventilation in office buildings.

Innovative designs, such as this building, greatly benefit from engineering analysis using state of the art computer simulation.

Detailed analysis of the ventilation performance of this building allowed for fine tuning of the design and gave increased confidence in the building performance, by providing detailed predictions of the cross-ventilation airflow pattern, the maximum velocities in the occupied volume of the workspace, and the ventilation efficiency and ventilation flow rates for variable wind conditions.

The configuration of the ventilation apertures in the façade, the office furniture design and the building management system control rules were tuned as a consequence of this study.

The control of the operable windows is a crucial feature of the design. EnergyPlus coupled with a control routine was used to calculate the effects of different control strategies and to design the control modes for the building.

Project Data

Architecture: MORPHOSIS

Engineering: Arup LA