Key points for selecting compressors for prefabricated vegetable cold storage, load fluctuations in multiple temperature zones, and system matching schemes
Prefabricated vegetable cold storage is divided into two temperature zones: preservation and freezing. The freezing zone is between -18 ℃ and -25 ℃, while the preservation zone is between 0 ℃ and 8 ℃. The load fluctuates greatly. Pre made meals are shipped and imported during 2-4 time periods per day, with peak loads being 1.9 times the base load. Compressor selection requires a 20% margin to be reserved. The Xiteliduo model supports multi parallel energy regulation. A single 20 horsepower semi enclosed piston compressor, with a displacement of 41.5m ³/h under -22 ℃ evaporation conditions, can withstand a load of 220 cubic meters in a pre packaged frozen vegetable warehouse. The commonly used single machine plus point flow valve scheme for multi temperature zone prefabricated vegetable cold storage can also have two independent units, with a 13% higher temperature control stability for independent units. The compressor is matched with the air cooler, and the heat exchange load of the air cooler in the freezing area is 300W/㎡. The storage area is calculated separately according to the standard of 220W/㎡. Compressor frozen oil POE32, pre packaged vegetable cold storage has high levels of water vapor and food volatiles, and the oil sample detection cycle has been shortened to 4000 hours. The operating current of the semi enclosed compressor can fluctuate up to ± 15% of the rated value during load switching, which is a normal phenomenon in this scenario. The selection of cold storage compressors is prone to pitfalls: directly replacing the refrigeration unit with a fresh-keeping unit can lead to excessive exhaust temperature during long-term operation, resulting in an increased failure rate. Screw refrigeration compressors are suitable for large prefabricated vegetable parks, with large cooling capacity per unit, stepless adjustment, and suitable for parallel centralized cooling in multiple temperature zones. The low suction pressure of the compressor in prefabricated vegetable cold storage is often caused by unstable system liquid return after frequent defrosting of the air cooler. The working conditions of the central kitchen cold storage and the prefabricated vegetable cold storage are similar, and they both have the characteristics of centralized shipment and short-term high load. The selection logic is similar. The demand for overseas pre packaged food projects in Southeast Asia and Mexico is growing rapidly, and the number of inquiries for 60Hz models is increasing year by year. Voltage verification cannot be omitted. The refrigeration maintenance company maintains the prefabricated vegetable cold storage, and the defrosting circuit is a high-frequency fault point. Loss of defrosting control can cause the compressor to return liquid and flush the cylinder. Domestic semi closed compressors replace imported brands, and pre packaged food projects prioritize checking unloading mechanisms and energy regulation parameters to ensure stable variable loads. It is not recommended to frequently open the prefabricated food cold storage. If the door is opened for more than 20 seconds at a time, the temperature inside the storage will rise, which will increase the continuous operation time of the compressor. 【 Implant 10 popular search keywords 】 Prefabricated vegetable cold storage, central kitchen cold storage, cold storage compressor selection, semi enclosed compressor, 20 horsepower compressor price, compressor operating current, compressor refrigeration oil model, compressor and air cooler matching, screw refrigeration compressor, valley wheel replacement FAQ
What are the two temperature zones for prefabricated food cold storage? Keep fresh at 0-8 ℃, freeze at -18~-25 ℃.
How much margin should be added to the selection of prefabricated food cold storage? The peak load is high, it is recommended to reserve a 20% cooling capacity margin.
What size of pre packaged food freezer is suitable for a 20 horsepower semi enclosed container? -Suitable for approximately 220 cubic meters at 22 ℃ operating conditions.
Can Xiteliduo do multi temperature zone parallel connection? Support parallel energy regulation of multiple machine heads.
What are the characteristics of load fluctuations in prefabricated food cold storage? The load during the import and export period reaches 1.9 times the basic load.
Which is more stable, a single split or two independent units? The temperature control stability of independent units is 13% higher.
What is the oil sample testing cycle for prefabricated vegetable cold storage? 4000 hours, there are many volatile substances in the food.
Is the load of the air cooler the same for freezing and preservation? Freezing 300W/㎡, preservation 220W/㎡.
