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DOE rooftop challenge winners offer energy, cost savings
Date:10/28/2013

d Katipamula, whose study was supported by DOE's Office of Energy Efficiency and Renewable Energy.

Katipamula and Wang ran extensive simulations analyzing the Rebel's performance compared to other rooftop units. The pair used DOE's Energy Plus building energy simulation software and worked with detailed performance data supplied by Intertek of Cortland, N.Y., which tested the units in the laboratory. Katipamula and Wang also created several new computer models a necessary step because they were testing technology that has never existed before. The Rebel includes variable-speed fans and a variable-speed compressor, which allow it to respond more precisely to conditions inside a building than conventional technology.

The team ran simulations for a typical 75,000-square-foot big-box store in three cities: Chicago, Houston, and Los Angeles. They compared performance of the Rebel to three types of units: those in use today, those that meet current federal regulations for new units, and those that meet more stringent requirements, known as ASHRAE 90.1-2010 standards. DOE designed the Rooftop Challenge to exceed the ASHRAE standards.

The team found that the Rebel reduced energy costs and use as follows:

  • Compared to units in operation today that are ready for replacement, energy costs were 33 percent less in Chicago, 44 percent less in Houston, and 45 percent less in Los Angeles. The Rebel slashed energy demand by 15 percent, 37 percent, and 36 percent, respectively.

  • Compared to new units that meet current federal regulations, costs were cut 29 percent, 37 percent, and 40 percent, in Chicago, Houston, and Los Angeles, respectively. Likewise, energy demand was reduced 12 percent, 30 percent, and 32 percent in those three cities.

  • As expected, savings were a bit less when compared with new units that meet today's strictest ASHRAE standards. Costs to run the Rebel system were 15 percent lower in Chicago,
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Contact: Tom Rickey
tom.rickey@pnnl.gov
509-375-3732
DOE/Pacific Northwest National Laboratory
Source:Eurekalert

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