Selection of Compressor for Edible Fungi Cold Storage | Specification for Matching Refrigerant and Defrosting System under High Humidity Preservation Conditions
The edible mushroom preservation warehouse is set at a temperature of 0 ℃~6 ℃, a relative humidity of 90%~95%, and a unit capacity cooling load of 85~120W/m ³. A medium high temperature semi closed compressor is selected.
The frosting speed of the evaporator under high humidity conditions is fast, and the defrosting cycle is shortened to once every 4-6 hours. The defrosting power of electric heating needs to be configured according to the heat exchange area of 0.45kW/m2, and defrosting completely leaves no residual ice.
The Xitelidou semi closed piston compression condensing unit is suitable for edible mushroom projects. The R507 refrigerant has a gentle change in condensing pressure under high humidity preservation conditions, making it difficult to frequently protect against high pressure.
When the compressor is matched with the air cooler, the air volume of the air cooler should be increased by 20% compared to ordinary fruit and vegetable warehouses. Insufficient air volume in high humidity environments can cause local temperature stratification and increase the speed of mushroom decay.
Low suction pressure faults are common in edible mushroom cold storage, often due to incomplete defrosting, continuous thickening of the ice layer on the coil surface, decreased heat exchange capacity, and continuous decrease in the dryness of the return air refrigerant.
The preferred insulation board for edible mushroom cold storage is 100mm polyurethane board. If the insulation is insufficient, the outer wall will condense and leak water, causing the humidity inside the warehouse to lose control and the energy consumption of the compressor to increase by 27% during long-term high load operation.
The foreign trade of edible mushrooms in Southeast Asia has been increasing year by year. Local farmers' cooperatives have limited procurement budgets and tend to prefer small semi enclosed units with 3 or 5 horsepower. Spare parts procurement is convenient and the maintenance threshold is low.
Replace old imported models with domestically produced medium to high temperature compressors, and control the cooling capacity deviation within ± 5% under the same operating conditions. There is no need to modify the original air cooler and condenser during cold storage renovation.
What is the normal discharge pressure of the compressor? In the edible mushroom preservation warehouse, the condensation temperature is 32 ℃, and the R507 high-pressure stable range is 14-16 bar. If it is higher than 18 bar, the condenser fins should be cleaned of accumulated dust.
The two equipment factories are equipped with edible mushroom cold storage air coolers, and it is necessary to increase the diameter of the water tray and drainage pipe to prevent defrosting water from flowing back into the evaporator, causing damage to the valve plate due to compressor liquid impact.
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FAQ
What are the temperature and humidity standards for edible mushroom cold storage? 0~6 ℃, relative humidity maintained at 90%~95%.
How long is the defrosting cycle set for edible mushroom cold storage? It is recommended to defrost every 4 to 6 hours under high humidity conditions.
3. What are the air volume requirements for the cold air fan in the edible mushroom cold storage? Compared to regular fruit and vegetable storage, the air volume has increased by 20%.
What impact will insufficient thickness of insulation board have? The condensation on the outer wall has increased the energy consumption of the unit by about 27%.
How much high pressure does it require cleaning the condenser? R507 fresh-keeping warehouse needs to be cleaned if the high pressure continues to exceed 18 bar.
How many compressors are commonly used in small edible mushroom cold storage? Retail projects often use 3 horsepower and 5 horsepower semi enclosed models.
7. What faults can be caused by the backflow of defrosting water and water in the compressor? Easy to cause damage to valve components due to liquid impact.
