This particular building is a well-maintained building that performs remarkably well considering its relatively unsophisticated HVAC system. In addition to paying close attention to proper maintenance, the building owner invested in a new DDC controls system approximately 10 years prior to our investigation and then followed through by carefully tuning those controls to eke out more performance than it seemed possible to achieve. As a result, the building maintains an Energy Star rating of 87!
BPT's careful survey of the facility included measurement of major HVAC equipment performance. That information was then incorporated into an energy model with the actual weather patterns for the most recent 12 months and "tuned" to match the actual energy bills, resulting in an excellent correlation between predicted and actual energy use (shown below). This calibrated energy model provided much greater confidence for savings projections.
The commercial building energy audit performed for this facility revealed only one, small low cost improvement opportunity. However, several capital improvement oportunities became apparent and these were promising for further reduction of energy use noticeably, perhaps an additional 10%.