Multi-stage compression refrigeration system meets the requirement of ultra-low evaporation temperature for special cold storage. The system adopts two or more compressors connected in series to realize large pressure ratio step by step. Intercooler is arranged between compression stages to reduce suction temperature of the second stage compressor. Compared with single-stage system, multi-stage design lowers compressor discharge temperature under ultra-low temperature condition. It is widely used for material testing cold rooms, deep frozen food storage and biological sample preservation. Refrigeration factory selects stage quantity and compressor combination according to target cold room temperature. Xindacool provides customized multi-stage compression refrigeration solutions for ultra-low temperature industrial cold rooms. Improper intercooler parameter setting reduces system efficiency and brings risk of overheating of high-stage compressor. About 35% of ultra-low temperature system efficiency loss faults relate to abnormal intercooler working state. Oil return design needs special optimization for multi-stage systems to guarantee lubrication for all compressors. System control logic coordinates running status of each compressor to adapt variable cooling load. Multi-stage compression technology ensures stable and safe operation under ultra-low temperature working conditions.
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