Consulting Specifying Engineer Jan/Feb 2015-CSE : Page-30

I t’s no secret that the lowest hanging fruit for energy-saving initiatives has been lighting. Hundreds of millions of tons of CO2 emissions have been saved. In fact, at this point, we see high-efficiency lighting baked into most new construction projects. Many of the larger retrofit projects have been done, as well. This leaves designers and owners looking for other places to find savings. Energy represents over 90% of the cost of filtration. The big cost is not in the cost of the filter itself, but rather the cost of the energy to push air through it. With conventional passive filters, increasing filter efficiency increases the static resistance to airflow, and the energy use. Today there are Ozone-free air clean-ing technologies, like polarized-media Duke Wiser President, Dynamic Air Quality Solutions In fact, in most metropolitan areas, the air outside contains more contaminants than the air indoors. Using today’s Ozone-free polarized-media electronic air cleaners to remove odors and ultrafine particles, rather than bringing in potentially contaminated air, makes both common and financial sense. Dynamic Manufacturing Facility in Carleton Place, Ontario Fortunately, filtration and indoor air quality both offer huge opportunities for energy efficiency. As with lighting, these are areas where designers often defaulted to the methods they used in the past. Commercial buildings consume 40% of all energy in the United States. Over half of that is used to condition and clean the air. And over half of that is fan energy. Clearly, that’s some low hanging fruit. People today expect their indoor air to be free of contaminants. This has led to higher efficiency filters and in some cases more outdoor air for ventilation. Until recently, both of these approaches would normally increase energy use. electronic air cleaners, that operate with a much lower static pressure resistance than conventional high-efficiency filters. They also enjoy a much greater dust-holding capacity, and a service life measured in YEARS instead of months, which gives these air cleaners about 1/3 of the life cycle cost (including energy) of conventional passive filters, while improving overall air quality. With ventilation, air cleaning can help implement the IAQ Procedure of ASHRAE Standard 62 to yield improved air quality and lower energy costs. Over the years, the ban on smoking indoors and the use of low-emitting building materials have improved indoor air quality significantly. “There is still low hanging fruit for energy efficiency.” The savings are there. There’s still plenty of low hanging fruit for improved energy efficiency. (800) 578-7873 ADVERTISEMENT

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