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Best Practice Guide |
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Commercial Office Buildings |
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Central HVAC SystemHeating SubsystemAlthough most boilers are gas- or oil-fired (93 percent of the market), those that are electric typically operate at only 65 to 75 percent efficiency. Consider upgrading to a more energy-efficient system. High-efficiency boilers have up to 90 percent combustion efficiency. The combustion efficiency of a typical boiler or furnace is 75 percent to 80 percent. Older boilers and boilers converted from coal have 60 percent to 70 percent combustion efficiency. Business ExamplesCushman & Wakefield modified the temperature settings and runtimes on boilers at Adobe Towers. This $400 measure resulted in more than a 20 percent reduction in natural gas use over previous years, saving Adobe $42,960 on energy costs. A digital boiler control operator was installed for better temperature in Adobe's East Tower, which saved another $1800 per year. Resources U.S. Environmental Protection Agency, ENERGY STAR Building Manual: Heating and Cooling System Upgrades. |