Once the water has been pumped through the stadium, it will go back to the basement. Then it will be pumped under the railroad tracks south of the stadium to a series of four cooling towers, which will cool the water through evaporation. Then the water will go back to the chillers to be cooled even more, and the process will start again. The ballpark is taking advantage of a number of refinements in energy efficiency, in areas from lighting to the chillers, to keep down costs. The north-facing orientation of the stadium also will keep costs down.
Most stadiums face east or west.
The tall walls on the eastern and western sides of Bank One Ballpark will keep a lot of the rays out, and the concrete won't have the chance to warm up as much. That wasn't necessarily intentional. The stadium simply fit best on the site in this configuration. And still no one knows how comfortable it will be, especially in the upper deck, which will have about 19,600 seats, or about 40 percent of the total. I think they should make that a policy.