Landscape Architect & Specifier News

JUL 2014

LASN is a photographically oriented, professional journal featuring topics of concern and state-of-the-art projects designed or influenced by registered Landscape Architects.

Issue link:

Contents of this Issue


Page 59 of 157

60 Landscape Architect and Specifier News fountains for people and pets. Pittsburgh wanted a prominent centerpiece for the plaza, something to capture attention and the imagination. How did Ned Kahn come up with idea for his art piece? "There is already so much solid-looking architecture surrounding the site," he explained. "I started thinking about the opposite, something that would maybe suggest the ghost of a building, that would dematerialize and dissolve into the landscape and the atmosphere." The translation of that concept is the arresting rise of 64 stainless steel, 32-ft. tall poles from the plaza, a piece of public art by Ned Kahn called "Cloud Arbor," made possible through a gift from the Charity Randall Foundation. Koolfog is responsible for the "clouds." The company specializes in outdoor cooling and humidification, fog effects, outdoor heaters and scenting systems to make outdoor areas more comfortable and engaging. Fog effects are generally generated by either heated or chilled fog machine systems. The heated kind use inert gas or an electric pump to bring mineral oil or glycol based "fog juice" into a heat exchanger where it vaporizes. Chilled fog machines employ dry ice, which create thick clouds that hang around close to the ground, but dissipate as they rise. Koolfog, by contrast, uses high- pressure pumps and water, couple with high-pressure misting and humidification nozzles engineered to deliver water particles above There are 64 stainless steel, 3-inch dia., 32-ft. tall poles, however, the poles positioned within a center spherical band on the ground plane create the cloud effects. The most upper and lower portions of the spherical band have 4 poles with 18 nozzles each; the upper-middle and lower-middle sections of the sphere have 8 poles with 24 nozzles each; and the center band of the sphere has 12 poles with 22 nozzles, for a total of 528 nozzles. Each nozzle required machining holes in the poles. The nozzles are flush to the pole surface for a clean aesthetic look. integrated into the poles is stainless steel tubing with nozzle adapters. To prevent freezing, heat trace and insulation wraps the atomization lines. Everything was inserted and fastened within the poles prior to arriving on site. All the poles were angled inward at installation to facilitate the desired cloud effect. PhOTO: ChriS SiEfErT, ChiLdrEN'S MuSEuM Of PiTTSBurgh (Continued on page 62)

Articles in this issue

Archives of this issue

view archives of Landscape Architect & Specifier News - JUL 2014