To optimize cooling efficiency (stable -18℃~-25℃, low energy loss) and meet environmental regulations, the following refrigerants are preferred for 200㎡ pork freezers, selected based on temperature adaptability, safety, and eco-friendliness:

1. R404A (Traditional Medium-Low Temperature Choice)

• Advantages: Matches the -18℃~-25℃ range perfectly, with high cooling efficiency and mature compatibility with piston/screw compressors (common in 80~180kW systems). It’s widely used, so maintenance and refrigerant replenishment are convenient.
• Considerations: A HFC refrigerant with high GWP (Global Warming Potential), facing phased restrictions in some regions (e.g., EU F-Gas Regulation). Suitable for short-to-medium-term use or areas with lenient eco-rules.

2. R449A/R452A (Eco-Friendly Alternatives to R404A)

• Advantages: Low GWP (≈1/3 of R404A), compliant with strict environmental standards. Same cooling capacity and compressor compatibility as R404A, ensuring no drop in refrigeration effect while reducing carbon footprint. Ideal for long-term operations or eco-sensitive areas.
• Considerations: Slightly higher cost than R404A, but cost-effective for compliance-driven projects.

3. R717 (Ammonia, for Large-Capacity High-Efficiency Needs)

• Advantages: Near-zero GWP, ultra-high cooling efficiency (superior heat transfer for -20℃+ deep freezing). Perfect for 120~180kW screw compressor systems (large 200㎡ cold storages with 5m height/1000m³ volume).

• Considerations: Toxic and flammable, requiring professional installation, leak detection, and safety measures. Only suitable for cold storages with dedicated maintenance teams.

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