Kellogg School of Management, Chicago, IL, USA

Kellogg School of Management

The Kellogg School of Management at Northwestern University is a building with 6 stories above grade with 1 story below grade. It houses offices and classrooms, and has a central atrium.
The good building façade is key for this high-performance building. Triple glazing in this highly glazed building (~70% window to wall ratio), in combination with thermally-optimized window frames, minimizes heat losses in the winter. The solar control glazing limits solar gains in the summer, preventing the rooms from overheating and reducing cooling loads. Despite the low solar energy transmission, the visual light transparency of the glazing is high, which creates bright spaces with high daylight availability. Hence, daylight control of artificial lighting also leads to substantial electrical energy savings.
Another system that significantly reduces energy demand for the building is the high efficiency heat recovery system. Due to Chicago’s cold winters and high summer humidity levels, the sensible and latent loads are very high. The design therefore includes enthalpy wheel heat recovery with 75% efficiency.
Radiant panels and radiant sails are used to heat and cool the offices and classrooms. Furthermore, the building has a cooling demand year-round, because of IT-Servers.
These facts are ideal conditions for the implemented energy supply system. A heat shifting strategy balances the diverse thermal loads around the Kellogg building before supplemental energy is drawn from additional sources, i.e. the geothermal system. The geothermal system with heat pumps provides over 50% of the total heating and cooling demand. If additional heating or cooling is still necessary, it is taken from the central plant.
The building achieves 17 of 19 points in LEED v3 - EAc1 Optimize energy performance with this concept. It is a decisive element of the LEED certification.