Seafood Quick Freezing Warehouse Quick Freezing Tunnel Compressor | Key Points for Supporting Double Stage Units for High Load Rapid Freezing
The seafood quick freezing tunnel requires the product center temperature to drop to -18 ℃ within 30 minutes, and the evaporation temperature to remain stable at -40 ℃~-45 ℃. Double stage semi closed compressors are commonly used to build the refrigeration unit.
The thermal shock during loading and unloading of goods in the frozen tunnel is extremely strong, and the heat load of a single door opening can be increased by 40%. It is recommended to reserve 25% of the selected cooling capacity margin to prevent the rebound of warehouse temperature and prolong the freezing time.
The Xitelide two-stage semi closed piston compressor is suitable for the quick freezing production line of seafood processing workshops. R404A is the most commonly purchased refrigerant for Southeast Asian seafood processing projects, and the spare parts circulation channel is mature.
The wind speed requirement for the frozen tunnel air cooler is 2.5-3.5m/s, and the heat transfer area of the evaporator is increased by 40% compared to ordinary meat cold storage, ensuring that the heat of aquatic products is quickly carried away under high-speed airflow.
Low suction pressure of compressors is common in quick freezing production lines, mostly due to the dense loading of goods blocking the air duct, resulting in insufficient heat exchange in the evaporator after the air volume decreases, and the dryness of the return air refrigerant continues to decrease.
The selection of the condenser for the quick freezing unit needs to be adapted to tropical climates. The ambient temperature in Southeast Asia during summer is usually 38-42 ℃, and the condensation heat exchange area is increased by 30% according to standard operating conditions to control high pressure.
The humidity in the seafood processing workshop exceeds 85% for a long time, and the electrical box of the compressor needs to be sealed to prevent moisture. The probability of rusting of the wiring terminals in humid environments increases by 2.3 times.
The viscosity grade of the frozen oil in the two-stage quick freezing unit is fixed, and the viscosity under low-temperature conditions cannot be too high. Excessive viscosity will cause insufficient oil supply to the high-pressure stage and accelerate the wear rate of the bearings.
Many cold storage owners mistakenly choose single-stage low-temperature compressors for their newly built seafood quick freezing projects, resulting in a single-stage pressure ratio exceeding the limit, exhaust temperatures consistently exceeding 120 ℃, and valve disc lifespan shortened by half.
The foreign trade orders for seafood processing along the African coast have been increasing year by year, and local maintenance resources are limited. Buyers prefer piston two-stage units with strong universal parts, which have lower maintenance thresholds compared to screw units.
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FAQ
What are the cooling requirements for the seafood freezing tunnel? The temperature of the product center drops to -18 ℃ within 30 minutes.
2. What is the reserved cooling capacity for the selection of frozen tunnels? Due to the large thermal shock during loading and unloading, it is recommended to reserve a 25% margin.
3. Recommended wind speed range for frozen tunnel air coolers? 2.5 to 3.5 meters per second, ensuring fast heat exchange.
4. Does high humidity in the workshop affect the electrical performance of compressors? When the humidity exceeds 85%, the probability of terminal corrosion increases by 2.3 times.
5. Is a single-stage low-temperature compressor suitable for quick freezing tunnels? Not suitable, pressure ratio exceeds the limit, exhaust temperature is too high.
How to choose a quick freezing condenser in tropical regions? The heat exchange area is increased by 30% on the standard basis.
What is the mainstream export refrigerant for quick freezing projects? Priority is given to R404A compressors in Southeast Asian aquaculture projects.
