Selection of High Temperature Working Conditions, Humidity Control, and Operation and Maintenance Plan for Semi Enclosed Compressors in Edible Fungi Cold Storage
Edible mushroom cold storage belongs to high humidity medium high temperature cold storage, with a storage temperature of 0 ℃~6 ℃ and a relative humidity of 90%~95%, to maintain the freshness of mushroom bodies.
The heat load of edible mushroom cold storage mainly comes from respiratory heat, and the respiratory heat production of mushrooms accounts for 42% of the total load. The load cannot be estimated solely based on the enclosure structure. The Xiteliduo medium high temperature four cylinder model is suitable for this scenario.
A 100 cubic meter edible mushroom cold storage with a total cooling load of approximately 8.1kW, matched with one medium four cylinder semi closed piston compressor, with R507 as the priority.
The compressor is matched with the air cooler, and the air cooler is selected with a large fin spacing anti frost model, with a fin spacing of ≥ 8mm, to reduce frost blockage caused by mushroom water vapor.
Compressor refrigeration oil POE32, high humidity environment system moisture control upper limit 45ppm, excessive moisture accelerates oleic acid hydrolysis.
The operating current of the semi enclosed compressor is high humidity and frequent defrosting, and the current fluctuation is about 5% higher than that of a regular fruit and vegetable storage, which is within the normal range.
Misconception in selecting compressors for cold storage: Choose low-temperature compressors. Low temperature models have low evaporation temperatures, making it difficult to maintain humidity inside the warehouse and causing water loss in the mushroom body.
Under high temperature conditions in the compressor exhaust pressure, the R507 condensation temperature is controlled within 17 bar at 40 ℃, and the high pressure is mostly due to the thick frost layer of the air cooler.
The fresh-keeping unit is the mainstream supporting unit for edible mushroom cold storage, and is not suitable for refrigeration units, as the evaporation temperature of the refrigeration unit is too low.
The maintenance cycle of the compressor is recommended to be 5000 hours for oil sample testing in high humidity edible mushroom cold storage, which is shorter than that of ordinary fruit and vegetable storage.
The refrigeration maintenance company maintains the edible mushroom cold storage, with a focus on checking the defrosting timer and defrosting heating wire. Failure to defrost will quickly cause frost blockage.
The Southeast Asian mushroom cultivation base is purchasing compressors for 60Hz medium high temperature four cylinder models, with a large number of inquiries and rapid expansion of the local edible mushroom industry.
Domestic semi closed compressors replace imports, and edible mushroom projects prioritize checking the cooling capacity under medium and high temperature conditions. Many brands only label low temperature conditions.
The opening frequency of edible mushroom cold storage is high, with more than 6 openings per hour, resulting in an 18% increase in cooling load. It is recommended to have a selection margin of 12%.
R404A can also be used in edible mushroom storage, R507 has smoother temperature control, less humidity fluctuations, and extends the shelf life of mushroom products by about 7%.
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FAQ
1. What is the standard temperature and humidity for edible mushroom cold storage? The storage temperature is 0-6 ℃, and the relative humidity is 90% -95%.
2. What are the main sources of edible mushroom load? Mushroom respiration heat accounts for about 42% of the total load.
3. What size of compressor is required for a 100 cubic meter edible mushroom cold storage? Match with medium to high temperature models with four cylinders.
4. Is Xiteliduo suitable for medium and high temperature four cylinder mushroom storage? Specially adapted for this type of preservation scene.
5. What are the requirements for the fins of edible mushroom air coolers? The spacing between fins should be ≥ 8mm to prevent the frost layer from quickly blocking.
Can low-temperature compressors be used in edible mushroom cold storage? Not recommended, humidity is difficult to maintain.
What is the oil inspection cycle for edible mushroom cold storage? 5000 hours of sampling and testing of frozen oil.
8. What are the differences between R404A and R507 in mushroom storage? R507 temperature and humidity are more stable.
