Energy
- Source:
- U.S. Department of Energy
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Overview: The article describes about Heating & AC Systems. In order to provide the greatest amount of daylight penetration yet minimize solar heat gain, large windows were chosen?7 feet high (2.1 m) in a 9-foot (2.7 m) ceiling?as well as high visible-light transmission glass (0.40 and 0.66) with a good shading coefficient (0.30). These high-performance windows let in light without affecting inside air temperature. They also maximize daylighting, lowering electric lighting needs. Direct-fired natural-gas absorption chiller/heaters, located on the 49th floor, were chosen over electrical and steam-driven chillers for heating and air conditioning.
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