Compressor selection, operating load and continuous operation control of seafood quick freezing warehouse and quick freezing tunnel
The compressor in the seafood quick freezing warehouse is mainly a low-temperature single-stage or two-stage semi closed piston machine, with an evaporation temperature of -35 ℃ to -42 ℃, ensuring the rapid freezing of seafood. Seafood quick freezing requires the center temperature to drop to -18 ℃ within 240 minutes, and the instantaneous heat load is 2.7 times the static storage load. The selection margin must be increased. The low temperature calibration of the Xiteliduo quick freezing special model is complete. The frozen tunnel compressor operates continuously for 24 hours without interruption, and it is recommended to control the upper limit of the condensing temperature under R404A working condition at 38 ℃ to reduce high temperature attenuation. 10 horsepower low-temperature semi closed compressor, with a displacement of 27.4m ³/h under -35 ℃ evaporation condition, suitable for static load of 80 cubic meters of seafood quick freezing warehouse. The compressor is matched with the air cooler, and the heat exchange temperature difference of the frozen tunnel air cooler is set at 6 ℃. The fan speed is ≥ 2.2m/s, and surface heat exchange is strengthened. Compressor frozen oil POE32, continuous quick freezing condition for 4000 hours replacement, the accumulation rate of seafood volatile impurities in the oil is higher than that of ordinary cold storage. When the exhaust pressure of the compressor exceeds 19 bar, high pressure protection is easily triggered under quick freezing conditions. The higher the tunnel production capacity, the greater the heat dissipation pressure of the condenser. When selecting compressors for seafood projects in cold storage, many construction companies only calculate the load based on static storage capacity, ignoring the instantaneous peak load of the feed, resulting in insufficient cooling. The valve plate of the semi closed compressor wears out faster under continuous freezing conditions. Every 6000 hours, the cover should be opened for inspection, and if the wear exceeds 0.1mm, it should be replaced directly. Southeast Asian seafood processing workshop purchases frozen compressors. The local ambient temperature is above 35 ℃ all year round, and it is recommended to increase the heat exchange area of the condenser by 20%. The refrigeration maintenance company is conducting maintenance on the frozen tunnel unit, with priority given to checking the return oil pipeline. High speed airflow is prone to oil carryover, which can cause poor oil return and lead to shaft holding. R507 can also be used for seafood quick freezing, with a refrigeration capacity about 5% higher than R404A under the same working conditions, and the procurement cost will increase by about 12%. The energy regulation of the frozen tunnel compressor prioritizes segmented unloading, with peak load during the feeding period and load reduction during low peak periods to stabilize the exhaust temperature. Compared to screw compressors, piston semi enclosed quick freezing models have cheaper spare parts and are easier to maintain on-site in overseas seafood processing plants. The air in the seafood freezer contains salt spray, and the condenser fins need to be coated with anti-corrosion. Salt spray corrosion can reduce heat transfer efficiency by 17% within 12 months. 【 Implant 10 popular search keywords 】 Seafood quick freezing, quick freezing tunnel compressor, quick freezing warehouse compressor, cold storage compressor selection, semi closed compressor, normal compressor exhaust pressure, compressor valve plate replacement, compressor refrigeration oil model, compressor and air cooler matching, Bitzer replacement FAQ
What is the standard evaporation temperature for quick freezing of seafood? Mainstream -35 ℃~-42 ℃, fast freezing condition.
How much higher is the freezing load compared to static storage? The instantaneous peak load can reach 2.7 times the static load.
How large is a 10 horsepower low-temperature semi closed freezer suitable for? Static adaptation of 80 cubic meter seafood freezer.
Does the Xiteliduo quick freezing machine support continuous 24-hour operation? Low temperature models are calibrated according to continuous operating conditions.
What is the required wind speed for the frozen tunnel air cooler? Suggest ≥ 2.2m/s to ensure freezing efficiency.
What is the replacement cycle for frozen oil in quick freezing conditions? 4000 hours, impurities accumulate faster.
How to deal with condenser in salt spray environment? Apply anti-corrosion coating to the fins and rinse them regularly.
Should R404A or R507 be prioritized for quick freezing? R507 has slightly higher cooling capacity and a higher price.
