Monthly Archives: December 2013

A Closer Look at Energy Conservation Measures – Occupancy Sensors to Control Lights

Continuing with my blog series, I present to you a case study in which we provided energy audit and retro-commissioning services. The next couple of posts will be highlighting an energy conservation measure (ECM) that we identified and our subsequent recommendations. The first ECM is Installing Occupancy Sensors to Control Lights.

Our team surveyed lighting and lighting controls throughout the facility. Existing lighting controls throughout the building were manually operated light switches. This method of control allows for lighting operation that does not always align with occupancy hours. These additional hours of unoccupied operation results in wasted energy.

A lighting survey was also conducted and we were able to identify the exact areas where lighting illumination hours could be reduced by utilizing occupancy sensors. Our recommendation was to install vacancy sensors that automatically turn off lighting fixtures in these spaces after a designated period of inactivity. In addition, tying back to our implementation blog post earlier, we recommended that owner’s pre-acceptance orientation take place to communicate operational sequences and maintenance requirements to the facility staff.

Overall, we calculated a savings of 41,198 kWh of annual energy savings, which amounts to $7,168 with a simple payback of 7.4 years.

Do you have sensors installed in your facility? Have you experienced a decrease in your energy bill? Share your experiences and/or questions below.

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