Energy Edge Solutions

Key Food



Supermarket Case Study

40,000 square foot supermarket. Located in New York City. 100+ store chain. Founded in 1937.

Business Situation

This supermarket runs 24 hours a day, 7 days a week. The store operates more than 200 horsepower of refrigeration systems which accounted for approximately 60% of the overall energy used. The lighting system consisted primarily of T12 magnetic ballast linear fluorescent fixtures which made up approximately 20% of the annual energy costs of the facility. The HVAC system consists of 9 roof top units and accounted for approximately 16% of the facility’s energy usage. The remaining facility loads include office equipment, kitchen equipment, cash registers, etc. The store’s energy costs were exorbitant and management realized that according to the US EPA, every $1 in energy costs saved in a grocery store equates to approximately $59 in in additional top line revenue.

Process

As a first step Energy Edge Solutions (EES) conducted a comprehensive whole building investment-grade energy audit and engineering study of Key Food’s facilities. The audit included an intense review of the following areas:

Utility Bills: EES reviewed the previous 12 months of utility data for the facility.

Designs: EES reviewed all available electrical one line and mechanical drawings.

Facility Energy Behavior: EES reviewed with the customer the current energy behavior of the staff including temperature set points, setting back temperatures when the facility is closed, turning off lights, office equipment, etc. after hours.

Building Envelope: EES checked weather stripping, insulation, open doors and areas around frequently trafficked areas, etc.

Lighting Systems: EES reviewed the current lighting systems to determine if the most efficient lighting options were being used and if occupancy sensors, timers and dimmers had been placed into operation. EES also looked for areas that were over lit and areas that could take advantage of natural sunlight.

Heating, Ventilation and Cooling Systems: EES looked at the HVAC/R systems to determine operating efficiency, maintenance schedules, filter replacement frequency, age, and upgrade and treatment options.

Motors and Equipment: EES itemized all electrical loads across the facility (including HVAC, production and refrigeration equipment) and their respective run times. Actual electrical measurements such as amperage, voltage, THD%, power factor, etc were taken at all loads as well as at the main. Load, duty cycles, operating efficiency, age, replacement and treatment options, etc. were all determined.

Solution

Energy Energy Edge Solutions (EES) recommended a whole facility approach to energy cost reduction including all available energy conservation opportunities to significantly reduce the facility’s expenses. EES also showed the customer how each different option would impact energy consumption as well as the project cost and return on investment. Based on EETC’s analysis and the store’s selection of available options, the customer was guaranteed a minimum kWh reduction of 16.09%. The maximum guaranteed project payback was 31 months. EES takes complete responsibility for all turnkey installations including the procurement of all equipment, labor, project management, pre- and post- inspections, waste removal, recycling, certifications, permits, administrative rebate work, etc.

Benefits

EETC measures the success of all projects in accord with the International Performance Measurement and Verification Protocol, Option C (www.IPMVP.org) as approved by the U.S. Department of Energy. EES compiles a statistical measurement and verification report quarterly for customers which includes utility bill analysis, base and verification period comparison, building simulation/ modeling, inclusion of all factors of influence, statistical correlation, regression analysis, etc. The measurement and verification process is ongoing and currently the turnkey project is exceeding the guaranteed savings and providing the store with a 39% return on investment.

Products and Services Recommended and/or Employed

  • Lighting retrofit of all T-12 and HID fixtures with T-8 fixtures with high efficiency electronic ballasts
  • De-lamping with Miro 4 polished aluminum reflectors
  • Energy management system for air conditioning loads
  • Lighting controls
  • Anti-compressor short cycling for heating systems
  • Anti-compressor short cycling for cooling systems
  • Occupancy sensors across office spaces
  • Recommended changes in staff energy behavior
  • Solar heating for swimming pools
  • Vend misers for vending machines
  • Variable frequency drives for pump motors
  • Thermal qualities simulation for refrigeration
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