THE RESEARCH ON MIXED-REFRIGERANT FRACTIONATION REFRIGERATION SYSTEM FOR LOW TEMPERATURE INSTRUMENTS
Mixed-refrigerant fractionation refrigeration system is applied in low temperature instruments in order to let up the volume and reduce the weight of refrigeration system. In this paper, 2-stage condenser-evaporator, high and low temperature regenerators are put together to improve on a combined heat exchanger. For using fluid seal as pumps, U-bend tubes are designed at the liquid outlet of the condenser and every separator. On the basis of these, the condensing pressure, evaporation pressure, minimum evaporation temperature, maximum starting pressure of different ratio non-azeotropic mixed-refrigerant are discussed through experiments respectively. Then the experiments of temperature dropping between the former series-parallel connection and the improved system of single-stage compression, 2-stage fractionation refrigeration system are predicted in a low temperature cooling circulation instrument with 5 liters/-80℃. The results indicate the effect of R134a/R23 is better than the others for its minimum refrigerating temperature and the temperature dropping of the improved system is faster, so it can replace cascade refrigeration system.
refrigeration system fractionation heat exchanger non-azeotropic mixted-refrigerant
Yang SHI Chun xia HU
Zhengzhou Institute of Light Industry, Zhengzhou 450002, China
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21（万方平台首次上网日期，不代表论文的发表时间）