It rains in New York City, on average, 60 inches a year—second only to Miami. Rather than simply let this precipitation run off the buildings and into storm drains, the WTC will collect and store that rain water for later use in its new high-efficiency evaporative cooling towers and for irrigating greenery within the 16-acre complex. (Since it hasn't been treated, the harvested rainwater cannot be used as a potable source.)
HARVESTING THE HUDSON
New York, as with most areas of the country outside of the confines of Northern California, requires significant air-conditioning service throughout the year. The occupants of the new WTC complex will stay frosty in even the muggiest of Autumnal weather thanks to the new and highly efficient 12,500-ton Central Chiller Plant (CCP) that uses water from the Hudson River to cool the WTC Transportation Hub, National September 11 Memorial and Museum, retail space and other non-commercial areas.
FULL SIZE
Located in the far Southwest corner of the complex—roughly in the same area as the previous plant—the CCP employs water extracted through the River Water Pump Station (RWPS), on the other side of the West Side Highway, to chill (and heat, during the Winter) water for distribution to the rest of the complex.
It will circulate 30,000 gallons of river water every minute. That's enough to fill 750 bath tubs, flush 10,000 toilets, and cool the same amount as approximately 2,500 home air-conditioners.
"It uses the Hudson as a way of both dissipating heat and preheating water," Del Valle explained. "Because water below a certain depth is a pretty constant temperature (about 45-50 degrees Fahrenheit), so what happens is, during the winter it takes less energy to heat and circulate it, and conversely, in the summer it takes less to cool it."
RECYCLING, REDUCING, REUSING
The new World Trade Center is already 75 percent old. Everything from the gypsum boards to the ceiling tiles contains a minimum of 75 percent post-industrial recycled content. This reduces the environmental footprint, not only on-site, but reduces the stress on the natural resources and energy needed to produce them.
At the same time, the WTC construction project recycles an incredible 80 percent of the waste generated at the site. According to Del Valle, "We've exceeded our original target by about 20 percent. The contractors have been really good, we've been watching and documenting how the material is recycled and sent back to the plants. It's really a cycle that's feeding on itself."
Monster Machines is all about the most exceptional machines in the world, from massive gadgets of destruction to tiny machines of precision, and everything in between.
A civilization can distinguish itself by how well it responds to disaster, and 10 years later, 9/11 is as much a story about recovery and rebuilding as it a story of terrible loss and tragedy. As a nation, our political and economic response has been imperfect—possibly even dead wrong—but we're focusing on the mechanical marvels that have helped us bounce back.
http://www.popsci.com
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