Parker's Convenience Stores, Savannah, Georgia

Cooling Convenience Stores

Typical Rooftop Cooling System Layout

Parker convenience stores are located in 60 locations in the South. These types of operations struggle with energy efficiency due to the large HVAC systems they must run constantly – and due to the opening and closing of doors, the temperature in the stores fluctuates greatly.

Another drain of energy are the refrigeration units that help keep drinks and other perishable items at the correct temperature. Of course, these units must also run on a constant basis.

EET partnered with the manufacture on a project on two of these stores to show the effectiveness of implementing an energy conservation measure (ECM) into the HVAC and refrigeration systems -CryoGenX4.

The goal of the project was as follows:

• Ability of the equipment to better satisfy fluctuating store and refrigeration loads
• Produce additional cooling redundancy at no extra cost or interruption to store operations
• Improve cooling equipment efficiency, lowering cost to produce each ton of cooling required
• Restore thermal efficiency, allowing cooling equipment to achieve thermostat set points faster
• Reduce unscheduled maintenance issues and extend equipment life by 15% or more
• Reduce overall energy consumption and peak demand charges (KVA)

Validation Results-

The results for the two stores involved in the project were as follows:

• Energy Reduction- 16%
• Capacity Increase 14.4%
• Moisture Removal Increase 18.6%
• Payback 11.9 Months
• 204 Metric tons CO2 Reduced per store
• Lifetime Return on Investment 579%
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• When comparing the combined reduction in compressor runtime hours and compressor amps, the
  resulting 15.6% improvement per RTU works to corroborate the very similar 16% average
  improvement in efficiency generated by the multiple IPMVP tests and the 15.7% reduction in average
  kWh usage.