The American Society of Heating, Refrigerating and Air-Conditioning Engineers has released for comment 18 proposed air-side control changes to its energy-use standard, ASHRAE/IESNA Standard 90.1. The proposals are intended to move toward 30% energy-cost savings in buildings. Specific comments can be filed by either July 19 or Aug. 3. Details are available at www.ashrae.org.
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.