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制冷劑的壓縮過程分兩段進行避免了因壓縮比增加而導致壓縮機容積效率下降而引起的功率消耗增加，在相同的低溫工況下雙級壓縮制冷循環(huán)中制冷系數cop及制冷量較單級壓縮機均有所提高使運行更經濟更可靠

The compression process of the refrigerant is carried out in two stages to avoid the increase of the power consumption caused by the decrease of the volumetric efficiency of the compressor due to the increase of the compression ratio. In the same low temperature condition, the refrigeration coefficient cop and the cooling capacity in the two-stage compression refrigeration cycle are relatively simple. Grade compressors have been improved to make operation more economical and reliable