Very High Efficiency Dedicated Outside Air Systems
Dedicated outside air systems (DOAS) separate heating and cooling from the ventilation system to allow for optimal control of each of these critical building functions. Building on the DOAS concept, a very high efficiency DOAS includes heat recovery ventilation and focuses on increased equipment efficiency and optimized system design. When compared to a code-minimum system upgrade, very high efficiency DOAS can reduce commercial building energy use by an average of 36%, and HVAC energy use by an average of 65%.
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High-Performance HVAC Can Reduce Energy Use in Commercial Buildings by an Average of 36%
Dedicated outside air systems (DOAS) separate heating and cooling from the ventilation system to allow for optimal control of each of these critical building functions. Building on the DOAS concept, a very high efficiency DOAS includes heat recovery ventilation and focuses on increased equipment efficiency and optimized system design. This approach has been proven to yield significant energy and cost savings in new and existing commercial buildings while providing better indoor air quality and improved occupant comfort.Resources
Innovative HVAC Approach Helps Airport's Energy Savings Take Off
Although a two-story, 1930s airport terminal building in Seattle underwent a major renovation in 2002, the HVAC was largely untouched. The duo of large, multizone rooftop units (RTUs) were left in place, with a third unit of the same type added during the renovations. This inefficient HVAC system wasted energy and money, led to inconsistent temperatures, and caused severe occupant discomfort.Case Studies
High-Performance HVAC Gets to Work for Utility Office
Flathead Electric’s district office is a single-story 1960s-vintage building with offices at the front and a combination of storage space and garage bays for utility trucks in the back. Their former HVAC system had been pieced together from several years of changes and modifications and it was no longer providing indoor comfort or an adequate level of heating efficiency. Flathead Electric took advantage of an innovative approach to HVAC they knew all to well—a very high efficiency dedicated outside air system (also referred to as very high efficiency DOAS).Case Studies
Trapper Creek Dorm Snares Energy Savings for Good
The Trapper Creek Dormitory is a federal government work campus in rural Montana. When restricted airflow caused summertime overheating, ventilation issues, and unsafe C02 levels in their dormitories, the facility managers decided to partner with Ravalli Electric Co-op and Bonneville Power Administration to implement a high-performance HVAC conversion.Case Studies
Legal Firm Objects to Older Building's Inefficiencies and Discomfort
Local law firm Immix Group purchased the upper floor of a 1909, two-story historic building in the once-industrial area of Northwest Portland. Vacant for nearly three years, the 12,000-square-foot space presented many comfort challenges. Air leaked between floors, the fresh air dampers were all closed shut, and the oversized existing HVAC system was aging and inefficient.Case Studies
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