Semi closed piston unit for dairy cold storage | Stable operation and maintenance plan for high temperature conditions in yogurt and fresh milk storage
The temperature control of the dairy preservation warehouse is 2 ℃~4 ℃, the relative humidity is 80%~85%, the unit storage capacity cooling load is 90~130W/m ³, and it is suitable for medium and high temperature semi closed piston compressors.
Dairy products are highly sensitive to temperature fluctuations, and fluctuations in storage temperature exceeding ± 1 ℃ can accelerate bacterial growth. The temperature difference between compressor start and stop should be controlled within 0.8 ℃ to reduce temperature fluctuations.
The Xitelidou small four cylinder and medium four cylinder semi enclosed models are widely used in dairy cold storage supporting compression condensing units. The R507 refrigerant operates in this range with mild exhaust and good long-term stability.
The cold air fan for dairy cold storage needs to be equipped with anti mold coating. Due to the high water vapor in the workshop, mold can grow on the surface of ordinary fins in 7 days, blocking the air duct and reducing heat transfer efficiency by 24%.
The operating current of the compressor needs to be inspected daily. If the current deviates from the rated value by ± 10% for 2 hours, two core parameters, refrigerant charging amount and expansion valve opening, need to be checked.
The equipment department of dairy factories generally prioritizes the purchase of complete sets of compression and condensation units, facilitating centralized control and maintenance records, and unifying the procurement batches of refrigeration oil and filter cartridges.
The load of this type of cold storage is stable, and the frequency of opening doors is lower than that of prefabricated vegetable cold storage. The maintenance cycle of the compressor can be extended to 3000 hours for detecting frozen oil and 10000 hours for inspecting valve plates.
Many engineering companies apply the parameters of fruit and vegetable cold storage, but the humidity control in the fruit and vegetable storage is too low. Directly copying the plan will cause condensation and dripping in the dairy product storage, and damage to the packaging due to moisture.
Exporting dairy cold storage units to Southeast Asia requires food factories to provide refrigerant safety instructions to avoid the risk of flammable refrigerants. The R32 model has low acceptance in food enclosed cold storage.
Domestic semi enclosed compressors can be replaced with imported models, with compatible installation bases and pipeline interface sizes. When refrigeration maintenance companies renovate old warehouses, the replacement period can be shortened by 60%.
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FAQ
What is the standard storage temperature for dairy preservation warehouses? Conventional control: 2 ℃ to 4 ℃, humidity 80% -85%.
What is the upper limit of temperature fluctuation allowed in the dairy product warehouse? Suggest controlling fluctuations within ± 0.8 ℃.
What are the problems with not having anti mold coating on the fins of the air cooler? Mold grows and blocks the air duct in a high humidity environment for about 7 days.
How long does it take to test the refrigeration oil of the refrigeration compressor in the dairy cold storage? Stable load condition, 3000 hours of sampling and testing.
5. Is the R32 compressor suitable for closed cold storage of dairy products? Most food owners refuse, as it is a combustible refrigerant.
What is the range of cold load values for dairy cold storage? 90 to 130 watts per cubic meter, calculate the unit horsepower as needed.
What are the hidden dangers of directly copying the fruit and vegetable cold storage plan? Low humidity can easily cause condensation and dripping inside the warehouse.
