Ben Picker, Emerson Commercial & Residential Solutions
Stemming operational costs, particularly rising energy costs, is almost always a top priority for convenience store chains. But family-owned Kelley’s Market, based in Rockford, Ill., had another consideration regarding its choice of refrigeration equipment when designing and building a new store in the company’s hometown: being a good neighbor.
As the refrigeration contractor walked company leaders through opportunities for improvements in energy efficiency, maintenance and product protection, one aspect of scroll outdoor refrigeration unit technology caught their attention: the ultra-quiet operation. They are up to 11 to 16 dB quieter than traditional outdoor units — roughly the difference in volume between a vacuum cleaner and a friendly conversation.
Family-owned businesses are often very community-minded. If Kelley’s Market could reduce noise in their neighborhood and in their store, they wanted to learn more.
Improving the Customer Experience While Saving Energy
Kelley’s Market was founded in 1926 by entrepreneurs Walter Williamson and Nate Kelley as the Kelley Williamson Co. Still family owned and an ExxonMobil distributor, they have been operating convenience stores and fuel stations for more than 90 years, with nearly 50 Kelley’s Market stores in operation throughout Illinois and Wisconsin. The trademark of their stores reflects their family values: they pride themselves on running crisp, clean stores offering top-quality products and outstanding service.
Among the current management of Kelley’s Market decision makers are astute businesspeople highly focused on operational issues such as energy efficiency, maintenance and product protection. Thus, they put a high value on a refrigeration solution that was both attractive and quiet for the best possible customer — and neighbor — experience.
What they found was outdoor walk-in refrigerator technology that offered energy-efficiency levels that could lower their energy bills by nearly 33 percent; built-in diagnostics that would enable faster, more accurate service; and ultra-quiet, variable-speed fan motors and internal baffling that could cut compressor noise by more than 50 percent.
The scroll outdoor refrigeration units range in power from three-quarters to 6 HP, making them a great fit for the needs of Kelley’s Market, with one unit powering their walk-in freezer, one for their walk-in cooler, and one dedicated for a merchandising display case.
By using the outdoor units instead of the usual self-contained or other indoor refrigeration systems, they would increase efficiency by removing heat load from the building’s air conditioning system — helping to cut both the demand and cost from their HVAC system as well.
The units incorporate multiple advances in refrigeration into a single-unit solution, including efficient and ultra-quiet, variable-speed, permanent split capacitor (PSC) fan motors; larger condenser coils for more efficient heat transfer; high-efficiency fan blade design; internal electronics to help optimize energy performance; an exclusive enhanced vapor injection (EVI) circuit to add capacity and system efficiency to freezers and other low-temperature refrigeration equipment; and built-in diagnostics that both enable rapid, precise servicing and help protect the compressor
The new technology is encased in a lightweight, slim enclosure that could be wall mounted. For Kelley’s Market, this meant they could place their units in locations previously not available, without the need to rent a crane for installation. Startup and commissioning for Kelley’s Market was trouble-free. And the clean design of the outdoor units offered a more attractive atmosphere for neighbors and customers alike — a big plus for Kelley’s Market.
Walking Into Savings
The scroll outdoor refrigeration units at the new Kelley’s Market store in Rockford represented the company’s first foray into scroll compressor technology. From the first day the store opened, the company saw major operational benefits. In the first year, the refrigeration units delivered energy savings of 29 percent compared to their legacy store technology. Inside the store, the three scroll units are expected to save about $2,500 in energy costs per year — a significant future consideration for a company operating nearly 50 stores.
Energy savings are obvious in their monthly bill. Efficiency savings show up in the smooth operation of the store, and by the reduction of the costs of routine and unexpected maintenance. Here, the built-in diagnostics play multiple roles.
Built-in diagnostics continuously monitor the units for fault codes so that service technicians can be called in immediately and directed to a problem, helping to save maintenance time and circumvent critical refrigeration downtime and repair expenses. To avoid unneeded service, the diagnostics can help predict or provide early warnings against common nuisances and failure issues, such as liquid flood-back conditions.
Integrated controls optimize the variable-speed PSC fan motor speed to help maximize the heat transfer to the unit’s larger condenser, making additional energy savings and perfect temperature control automatic. The integrated smart systems can combine for optimum performance to help lower total lifecycle costs to go along with the major energy savings.
Inside and outside the market, and throughout the store’s neighborhood, the energy efficiency and optimum performance of the scroll outdoor refrigeration units result in a quiet hum — just the way the locals want it.
Ben Picker is product manager of Copeland Condensing Units at Emerson Commercial & Residential Solutions. With more than 14 years of design and engineering experience related to condensing units, he is responsible for growing and supporting Copeland condensing unit sales through a distribution network of more than 400 wholesalers.
Editor’s note: The opinions expressed in this column are the author’s and do not necessarily reflect the views of Convenience Store News.