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Demonstration Assessment of LED Freezer Case Lighting

Total energy savings (including more efficient light source, reduced consumption from occupancy sensors, and reduced demand on the compressor) is estimated to be 2,659 kWh per year for a typical 5-door case. At Eugene electricity rates ($0.0827/kWh), the calculated simple payback from energy savings alone is approximately 6.3 years. Maintenance savings are typically specific to each application and will not be the same for other applications. For this demonstration retrofit, maintenance savings are estimated to further reduce the payback to approximately 5.4 years. A complete simple payback analysis that might also include utility rebates and maintenance savings could be much shorter. Current Eugene-area Utility rebates and Oregon tax credits could further reduce the payback period to about 1.6 years.

It is also important to consider that other potential attributes of the LED application in freezer cases make it a potentially better retrofit than adjusted fluorescent lighting. These include potentially longer life and reduced freezer case heat load that contributes to additional savings with LED technology. The potential for savings from reduced freezer case heat load due to lighting is difficult to measure because of the number of variables affecting individual freezer case installations, so was only estimated in this analysis.

This work was done by E.E. Richman and J.R. Tuenge of the Pacific Northwest National Laboratory.

This Brief includes a Technical Support Package (TSP).

Demonstration Assessment of LED Freezer Case Lighting (reference GDM0008) is currently available for download from the TSP library.

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