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

27 percent lower in Houston, and 18 percent lower in Los Angeles. Energy demand was 8 percent, 23 percent, and 15 percent lower, respectively.

While the cost of the unit was not part of the team's analysis, Katipamula estimates it would take at least a few years for the latest technology to pay back the increased investment in the newer units. The team's analysis did not include a look at some of the unit's additional features, such as its potential to save energy used for heating.

"The savings depend very much on the particular conditions the climate, the size of the store, the materials used in the construction, and so on," said Katipamula. "We've developed Energy Plus software models that allow building designers or owners to calculate for themselves the cost-effectiveness of installing a newer unit that meets the DOE rooftop challenge."

While "cost-effectiveness" might seem to break down into simple dollars and cents, that is often not the case for commercial buildings. Payback differs dramatically depending on whose investment is at stake; oftentimes, tenants pay the energy costs, and they often have no choice in what equipment a building owner or builder chooses to use. Katipamula says that offering incentives to builders is one way to increase their stake in using cost-efficient equipment.


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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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