Commercial refrigeration systems are specialized cooling units used in businesses like restaurants, grocery stores, and warehouses to preserve food and other perishable items. These systems maintain low temperatures to prevent spoilage and ensure food safety. They come in various forms, including walk-in coolers, display cases, and ice machines, each designed for specific storage needs. These systems typically use a refrigeration cycle involving a refrigerant, which absorbs heat from the interior and releases it outside. Key components include compressors, condensers, evaporators, and expansion valves. Proper maintenance is essential for efficiency and longevity, helping businesses save energy and reduce costs.