Selection Guide for Fin Spacing Inside the Evaporator of Cold Air Fan in Cold Storage: Precise Matching of Different Cold Storage Requirements

I'll explain the differences in fin spacing dimensions, their advantages and disadvantages, and suitable applications for cold storage systems using straightforward engineering terminology, so you can easily select the appropriate model.

I. Core Differences in One Sentence

• Small fin spacing: ensures high heat transfer density and efficiency, but is prone to frosting and airflow obstruction.
• Large fin spacing: Less prone to clogging and frost resistance, but results in smaller unit heat transfer area and slightly lower efficiency.
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I. Core Differences in One Sentence

• Small fin spacing: ensures high heat transfer density and efficiency, but is prone to frosting and airflow obstruction.
• Large fin spacing: Less prone to clogging and frost resistance, but results in smaller unit heat transfer area and slightly lower efficiency.
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II. Comparative Classification of Common Pitch Sizes

1. Small slice thickness: 4.0 mm / 4.5 mm

characteristic

• Dense fins provide a large heat exchange area and high refrigeration efficiency.
• Low wind resistance results in relatively low power consumption of the fan.
• Frosting quickly obstructs the air ducts, necessitating frequent defrosting.

merit

• High heat transfer efficiency with rapid cooling
• Smaller in volume and slightly lower in cost under the same cooling capacity

shortcoming

• Frost blockage is very likely to occur, and a high-humidity environment will cause a rapid decrease in air volume.
• Frequent defrosting, high energy consumption, and significant storage temperature fluctuations

Applicable cold storage

• High-temperature storage: 0°C to +15°C for fruit and vegetable preservation, cool storage, and controlled atmosphere storage
• Dry, low-humidity, frost-free environment
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2. Medium film pitch: 6.0 mm / 8.0 mm

characteristic

• Balancing Heat Transfer Efficiency and Frost Resistance
• The most widely used in the industry, standard equipment for cold storage facilities

merit

• High versatility; thick frost layer does not cause severe wind obstruction
• The defrosting cycle is moderate, and the storage temperature remains stable.

shortcoming

• Obstruction may still occur under extreme low temperature and high humidity conditions
• The heat transfer efficiency is slightly lower than 4.5 mm.

Applicable cold storage

• Medium-low temperature storage: approximately-18°C standard freezer
• Meat refrigeration, aquatic product refrigeration, logistics cold storage
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3. Large spacing: 10.0 mm / 12.0 mm

characteristic

• Sparse fins and wide air passages make it extremely difficult for frost to block the passage.
• Small heat transfer area and low efficiency

merit

• Exhibits strong anti-frosting capability with extended defrosting intervals
• Suitable for low temperature, high humidity, and frequent door opening
• Not prone to ice formation and blockage, with low failure rate

shortcoming

• Low heat transfer efficiency requires a larger heat exchange area for equivalent cooling capacity.
• Larger in size and slightly more expensive

Applicable cold storage

• Low-temperature storage: -25°C to-35°C for quick-freezing and rapid-freezing storage
• High-humidity cold storage: aquatic products, chilled fresh products, slaughtering and cutting rooms
• Cold storage with frequent loading/unloading and high humidity
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4. Variable interplant spacing (larger anteriorly and smaller posteriorly, e.g., 16 mm + 6 mm)

characteristic

• The air intake side has a large blade spacing to prevent clogging, while the air outlet side is densely packed to enhance heat exchange.

merit

• Balancing plugging capability and efficiency for optimal comprehensive performance
• Demonstrates optimal performance under high humidity conditions

shortcoming

• Complex manufacturing process and higher cost

suit

• High humidity rapid freezing, tunnel rapid freezing, and frequent door opening in logistics cold storage facilities

III. Summary

• High temperature preservation with low humidity → Using a 4.5mm small spacing for high efficiency
• Standard freezing at-18°C → Using 6/8mm medium slice spacing, the most common configuration
• For low-temperature quick-freezing and high-humidity goods → use 10/12mm large spacing plates without air blockage
• For humid, cold, and busy warehouses, selecting a gear ratio of 8:16 mm is most suitable.
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