ShopRite is the largest retailer-owned cooperative in the United States, comprised of more than 230 retail grocery stores throughout the Northeast. Each store contains a large number of constant run refrigerated systems, including food product display cases and walk-in storage areas. These systems must maintain regulated temperature setpoints in order to preserve fresh produce and perishables. Inside each system are evaporator fans that operate 24x7x365 days per year.
Groom Energy engineers surveyed the evaporator fans at ShopRite’s Livingston, NJ store, determining that they were driven by shaded pole or permanent split capacitor motors. These motors operated at 17% efficiency, producing 9 watts of output power for 53 watts of input power. This inefficiency also produced unnecessary waste heat, which compressors had to remove in order to maintain established temperature setpoints.
GES engineers calculated that by upgrading the existing motors to newer premium efficiency electronically commutated motors (ECM) ShopRite could achieve significant energy savings, with no change to the system’s operational characteristics. The ECM motors would deliver the same amount of evaporative force, but consume less energy while contributing significantly less heat, which in turn would reduce the compressor loading.Groom Energy planned and implemented a turnkey retrofit with almost 400 ECM motors, carried out over a two-night period so as not
to disrupt store operations. To support this project Groom Energy also secured financial incentives from New Jersey Smart Start, the company’s local utility efficiency program.
|Lifetime Electrical Savings||$388,390|
|Annual Electrical Savings||$41,834|
|Return on Investment||140%|
|Pounds of CO2 avoided annually||16,984|