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Story tips from the Department of Energy's Oak Ridge National Laboratory, September 2005

ENERGY-- Modular marvel . . . Hospitals, college campuses and factories are among likely customers for the Modular Integrated Energy System, which boasts 80 percent to 90 percent efficiency compared to the national average of 32 percent. Those figures are based on the lower heating value of natural gas and compared to the efficiency of central power plant electricity generation and transmission. The system combines a 4.5 megawatt combustion turbine generator with a waste heat-fired 2,500-ton absorption chiller/heater to provide cooling, heating and power. ORNL co-developer Jan Berry of the Engineering Science & Technology Division notes that the Modular Integrated Energy System is unique because it is the first of its size to produce electricity and use turbine exhaust as the only source of fuel for an absorption chiller. The natural gas turbine generates electricity that can be used on site or exported to the local utility. This research was funded by DOE's Office of Energy Efficiency and Renewable Energy Distributed Energy Program. [Contact: Ron Walli, 865-576-0226; wallira@ornl.gov].

ENERGY -- The hydrogen juggle . . .

Discovering the ideal material for reversible storage of hydrogen could become a less daunting task because of work by a team led by David Singh of Oak Ridge National Laboratory's Condensed Matter Sciences Division. The challenge is to find a material that is efficient at storing hydrogen yet also has attractive thermodynamic properties that allow the hydrogen to be efficiently retrieved. Many intermetallic compounds are good for one but not both. In a paper published in Physical Review Letters (PRL 95, 056403, July 29, 2005), Singh and colleagues outline an approach found by computational modeling that allows them to tweak intermetallic compounds -- materials composed of two or more elemental metals. Included in the paper are some unexpected findings about materials with
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Contact: Ron Walli
wallira@ornl.gov
865-576-0226
DOE/Oak Ridge National Laboratory
16-Sep-2005


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