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制冷劑的壓縮過程分兩段進(jìn)行避免了因壓縮比增加而導(dǎo)致壓縮機(jī)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(jí)壓縮制冷循環(huán)中制冷系數(shù)cop及制冷量較單級(jí)壓縮機(jī)均有所提高使運(yùn)行更經(jīng)濟(jì)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