Every energy audit is the same but different, the goal, searching for cost and energy savings is the same. whether its factory or office. And we follow the same published process, yet every energy audit guide attempts to detail how to identify those cost savings, and that is where the document evolves from its clinical, prescriptive list of requirements into vague generalizations because examining data, sometimes imperfect data, to find cost savings is more art than science.
Anyone can count lamps, often delegated to juniors in some firms, but an energy audit that does not maketh. Most commercial buildings rely on central chiller plant to provide chilled water to the air handling units and fan coil units dotted across the building. To find those savings good data from the central chiller plant is essential because it is the largest part of the total energy consumption. In the chart above the most efficient chiller was set to contribute the largest load.
But wait, our research found it did not, the data revealed the secretive life of chillers, and along with all the other information we gathered, meant significant cost and energy savings for this project by arranging for the most efficient chiller to handle the largest load portion of the load (electricity powering air conditioning is the largest cost centre).
About the Author
John A. Herbert is a veteran Building Services engineer, with more than 30 years experience, he was educated in the United Kingdom and has been working across Asia for more than two decades advising international and local companies. He is a Hong Kong Registered Energy Assessor (REA), and a BEAM Professional.