ISUZU Refrigerated trucks typically consist of a chassis, a body, and a refrigeration unit, with the refrigeration unit playing a vital role in the vehicle's operation. Refrigeration units used in refrigerated transport are broadly categorized into two types: standalone and dependent. Choosing the right refrigeration unit based on your transport needs is crucial, as it directly impacts operating costs and efficiency. Understanding the definition, characteristics, and applicable applications of each type will help you make an informed choice.

Standalone refrigeration units are typically self-contained systems, but also available in split configurations mounted on the vehicle's frame. They contain a separate engine and generator, powering the refrigeration system independently of the truck's engine. This allows them to operate regardless of whether the vehicle is running. In contrast, dependent refrigeration units rely entirely on the truck's engine for power, lacking their own power source and unable to operate when the vehicle's engine is off.

The primary advantage of standalone refrigeration units is their operational stability and reliability—critical for temperature-sensitive cargo. They ensure continuous cooling even if the truck stalls or the engine fails, preventing cargo from spoiling. However, due to the need for an additional engine system, these units are more expensive and more complex to maintain. In contrast, dependent refrigeration units are more affordable, simpler in design, and easier to maintain. Their main disadvantage is their complete reliance on the truck engine; if the engine stops, so does cooling. This can lead to temperature fluctuations, especially with frequent door openings or engine failure, increasing the risk of cargo damage.

Given these differences, despite their higher cost, dependent refrigeration units are more suitable for long-distance transport with larger vehicles (such as trucks and semi-trailers over 7 meters in length). Dependent units are more economical and are typically used in smaller vehicles under 7 meters in length. They are well-suited for shorter distances or urban deliveries, where engine operation is more stable and continuous cooling is less critical.

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