Commercial buildings could cut their heating and cooling electricity use by an average of 57 percent with advanced energy-efficiency controls, according to a yearlong trial of the controls at malls, grocery stores and other buildings across the country.
The study, by Pacific Northwest National Laboratory in Richland, demonstrated higher energy savings than what was predicted in earlier computer simulations by the same researchers.
“We’ve long known that heating and cooling are among the biggest energy consumers in buildings, largely because most buildings don’t use sophisticated controls,” said the study's lead researcher, PNNL engineer Srinivas Katipamula.
“But our tests of controls installed at real, working commercial buildings clearly demonstrate how much more energy efficient air-conditioning systems can be.”
The research was supported by DOE’s Office of Energy Efficiency and Renewable Energy and the Bonneville Power Administration.
Sitting on the roofs of many commercial buildings are shiny metal boxes containing heating, cooling, ventilation and air conditioning, or HVAC, units. These are pre-made in a factory and have all their components inside a box, and are called “packaged” HVAC units.
Another kind of commercial HVAC, called air handling units, have long used sophisticated controls to ensure they work as efficiently as possible. But packaged units are often allowed to run for hours on end, even if they aren't needed, and receive little maintenance.
Packaged HVAC units consume the same amount of electricity each year as 8 million U.S. residents, or about 2,600 trillion British thermal units of energy. Those ignored and often-inefficient HVAC systems create higher power bills and contribute to the nation's greenhouse gas emissions, according to PNNL.
In 2011, PNNL researchers set out to adapt the controls already found in air handling HVAC units for use in packaged rooftop HVAC units.
But while the PNNL team was evaluating how these controls could work, they learned a few companies were simultaneously and independently in the process of developing such advanced controls.
During the summer of 2012, the team installed one of the commercially available control kits on 66 rooftop HVAC units at eight volunteer commercial buildings in Washington, Ohio, California and Pennsylvania. The buildings included shopping malls, grocery stores, big-box stores and a medical clinic. The installed devices, manufactured by Transformative Wave of Kent, Wash., were chosen because they most closely resembled the advanced controls PNNL had envisioned.
Katipamula and his colleagues found that, compared with standard operations, the HVAC units using advanced controls cut their energy use by an average of 57 percent. The actual energy savings ranged from 20 to 90 percent.
Larger buildings such as malls, which need bigger HVAC units, saved more energy than smaller buildings. And buildings that ran ventilation fans more, such as stores open long hours, tended to save more energy.
Translating the energy savings into dollars saved depended on local power costs. Nationwide, energy costs an average of 10 cents per kilowatt-hour, though areas with abundant and inexpensive power supplies often pay less and large cities with greater energy needs generally pay more.
When using the national average, researchers found all the field-tested HVAC units would have saved an average of $1,489 annually per unit.
The team calculated it would take a building owner three years to recoup the cost of buying and installing advanced controls with that average cost savings. Commercial buildings often have multiple rooftop HVAC units, so actual savings per building would depend on the number of units used.
But the exact payback period depends on several factors.
To help building owners weigh the costs, the research team developed a table that lays out which specific combinations of an HVAC unit's size, the number of hours its fan runs daily and the local energy rate would result in a three-year or less payback period. The team concluded installing advanced controls in smaller units with a capacity of 15 tons or less could achieve a three-year payback in areas where energy costs 12 cents per kilowatt-hour or more, or where sufficient utility incentives were available.
“I’m proud to see the advanced controls my colleagues and I evaluated not only work in the real world, but produce significant energy savings,” Katipamula said. “We hope commercial building owners will be inspired by these tangible savings and install advanced controls in their rooftop HVAC units.”
Building owners interested in upgrading or replacing their HVAC systems can learn more from the Advanced Rooftop Campaign, which was formed by DOE's Better Building Alliance, ASHRAE (also known as the American Society of Heating, Refrigerating and Air Conditioning Engineers) and the Retail Industry Leaders Association.