LED Refrigerated and Freezer Case Lighting
"Lighting, Cold Case Display": LED vs. Linear Fluorescent
Strip lights mounted inside commercial refrigeration and freezer cases, typically replacing fluorescent lighting. They offer additional savings because they work well with occupancy sensors and can turn off when no one is around.
Item ID: 89
Technical Advisory Group: 2009 Lighting TAG (#1)
Lighting for commercial refrigerated and freezer cases has typically been provided by fluorescent luminaires that use an omnidirectional light source to deliver directed illumination. Unlike traditional fluorescent lighting, LED refrigerated display case lighting can take advantage of the inherent directionality of LEDs to direct all of the available light onto the shelves where it is needed, eliminating wasted light and energy.
LED refrigerated display case lighting systems are widely available from a number of manufacturers. The U.S. Department of Energy (US DOE) is encouraging research, development and market penetration of the technology and is providing resources for objective, ongoing information about the technology. The DesignLights Consortium includes categories for LED vertical and horizontal refrigerated display case lighting.
Studies conducted by the Sacramento Municipal Utility District (SMUD) and other California utilities show that energy savings over traditional refrigerated display case lighting using fluorescent sources may be significant—up to 60 - 70% depending on controls, design light levels and fixture efficiency. Additional refrigeration system cooling energy savings result from the lower heat load in the case. Lamp life could be significantly longer than for other systems in use, potentially providing maintenance savings that can be significant for retail applications. Additionally, the US DOE predicts continued improvement in efficacy and decline in price for LED lighting.
Baseline Description: Four 8-foot 54W fluorescent lamps
Baseline Energy Use: 1488 kWh per year per unit
Based on a fixture serving a refrigerated case with four 8-foot 54W fluorescent lamps drawing 60W each and operating 6200 hrs. per year.
Manufacturer's Energy Savings Claims:
Currently no data available.
Best Estimate of Energy Savings:
"Typical" Savings: 61%
Energy Savings Reliability: 6 - Approved Measure
You do not normally get this much savings with LED vs. fluorescent, but you may be able to get by with lower wattage LEDs because of the light color, directionality and because LEDs operate better in cold temperatures than fluorescent. Already in lighting calculator, so rated ESR 6.
Note: This is a deemed measure under the October 1, 2014 BPA "Energy Efficiency Implementation Manual". The deemed amount varies depending upon whether T12 or T8 lighting is replaced. Also on LED power density per linear foot.
Energy Use of Emerging Technology:
580.3 kWh per unit per year
Energy Use of an Emerging Technology is based upon the following algorithm.
Baseline Energy Use - (Baseline Energy Use * Best Estimate of Energy Savings (either Typical savings OR the high range of savings.))
Potential number of units replaced by this technology:
Rough estimate based on one fixture/unit (containing four 8 ft 54 W lamps) per 1,000 square feet of food retail floor area in the Pacific Northwest. Commercial Building Stock Assessment, NEEA, 2009 http://neea.org/resource-center/regional-data-resources/commercial-building-stock-assessment
An estimate of refrigerated door market size was made for the state of California. The focus of this technology is on medium and larger size grocery stores. A typical medium size grocery store on the average has about 35 reach-in glass doors. The number of low temperature reach-in glass doors in a large grocery varies from 65 to 100, with an average of about 80 (SCE, 2009). California is estimated to have 12,460 medium size stores and 6,893 large grocery stores. This leads to an estimate of 987,540 glass doors in the state of California. Assuming that the Northwest has grocery stores that serve about the same local population each as those in California, it is estimated that 987,540 x (4/11.75) or 336,183 doors exist (where 4 and 11.75 are the Northwest and California portion of the national population). Assuming 3 doors per refrigerated case leads to an estimate of 112,060 refrigerated cases in the Northwest. When equipped with fluorescent lamps and ballasts, each 5-door case has a power requirement of about 352 Watts (about 70.4 Watts per door) (Bisbee, 2008).
Regional Technical Potential:
0.09 TWh per year
Regional Technical Potential of an Emerging Technology is calculated as follows:
Baseline Energy Use * Estimate of Energy Savings (either Typical savings OR the high range of savings) * Technical Potential (potential number of units replaced by the Emerging Technology)
Currently no data available.
Simple payback, new construction (years): N/A
Simple payback, retrofit (years): N/A
Cost Effectiveness is calculated using baseline energy use, best estimate of typical energy savings, and first cost. It does not account for factors such as impacts on O&M costs (which could be significant if product life is greatly extended) or savings of non-electric fuels such as natural gas. Actual overall cost effectiveness could be significantly different based on these other factors.