Keeping perishables cool or cold may seem as obvious as putting them away in a store's many refrigerated or frozen cases. But maintaining those cases at peak efficiency with minimum cost remains a far from trivial exercise. Fortunately, the technology supporting the in-store refrigeration process continues to improve. From energy-free doors, propylene glycol refrigeration systems and superheat optimizers to scroll compressors and leak-detection kits, retailers have a wide range of tools ...

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