then use that ice throughout the day to provide cooling via chilled-water heat exchanger coils. Their IceBank system has been installed in over 4,000 businesses around the world. According to Calmac CEO Mark McCracken, NYC buildings using this technology, such as Rockefeller Center, have received payback in three years instead of the usual seven for this type of project. Not only does it save money, it's also greener because ice storage reduces the need for inefficient peaker plants to respond to daytime peaks in electric demand, drawing power at night instead, when wind power is most abundant and least utilized. Night time is also when chillers operate most efficiently since condensers are discharging heat into cooler outside air.
RP Siegel, PE, has a master's degree in mechanical engineering and worked for 20 years in R&D at Xerox Corp. An inventor with 50 patents, and now a full-time writer, RP finds his primary interest at the intersection of technology and society. His work has appeared in multiple consumer and industry outlets, and he also co-authored the eco-thriller Vapor Trails .