Standing 1776 feet tall, the iconic tower’s unique envelope incorporates curtain wall, glass panel wall and cablenet wall. As building envelope consultants, Vidaris assisted the architect in drawing review and mock-ups for exterior wall performance, including blast mitigation. Vidaris was also instrumental in the development and selection of building exterior materials including a high performance thermally advanced curtain wall system, incorporating energy efficient low-e glass. We witnessed the curtain wall fabrication and monitored the installation.
On this signal building, Vidaris performed LEED modeling, energy code compliance, and compliance with Executive Order 111, which requires 20% energy savings compared to the energy code baseline. We also evaluated the thermal modeling of the curtain wall as provided by the manufacturer. To meet these goals, Vidaris, in collaboration with SOM and JBB (the HVAC consultant), analyzed several bundles of efficiency measures that included:
- A high-efficiency envelope
- Efficient lighting with daylight dimming at perimeter
- Water-cooled packaged units, with highest efficiency, allow for different occupancy schedules across diverse tenants
- All buildings on the site must use ConEd steam – and 1 WTC recovers the heat from the steam condensate
- The design included a 1.2 MW fuel cell system. Vidaris studied the operating parameters extensively to verify that the system was optimized for the building load. Unfortunately the fuel cell system was damaged beyond repair by Superstorm Sandy.