| 摘要: |
| 为了提高小型自复叠制冷装置中CO2和丙烷的分离效率，在循环中增设了分凝器。分析了CO2浓度、冷凝器出口蒸汽干度及分凝器高压侧出口温度对带有分凝器的自复叠制冷循环性能的影响。结果表明，当CO2质量浓度从0.22上升到0.31时，实验和理论计算的蒸发温度分别升高了6.8 K和5.7 K，相应的COP分别提高了68.3%和24.9%。当冷凝器出口蒸汽干度从0.5增加到0.9时，蒸发温度先降低后升高，在干度等于0.7时达到了211.37 K的最低值；COP陡降了98.8%。此外，分凝器高压侧出口温度升高8.21 K导致蒸发温度升高了1.41 K，COP增加了21.3%。 |
| 关键词: 自复叠制冷循环 分凝器 天然制冷剂 CO2 丙烷 |
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| Performance of a Small-sized Auto-cascade Refrigerator with a Fractionation Heat Exchanger |
| Zhang Li,Xu Shiming,Du Ping,Yang Chunguang,Gao Hongyan,Shu Weihua |
| (School of Energy and Power Engineering, Dalian University of Technology;School of Mechanical and Power Engineering, Dalian Ocean University;Panasonic Appliance Cold Chain (Dalian) Co., Ltd.) |
| Abstract: |
| A fractionation heat exchanger was employed to improve the separation efficiency of CO2 and propane in the small-sized auto-cascade refrigeration cycle. The effects of CO2 mass concentration, vapor quality at condenser outlet and the outlet temperature on the high-pressure side of the fractionation heat exchanger were analyzed. Results show that as CO2 mass concentration grows from 0.22 to 0.31, the evaporating temperatures of the experiment and theoretical calculation are raised by 6.8 K and 5.7 K, respectively. And the corresponding COP is increased by 68.3% and 24.9%, respectively. Simulation data also reveal that as the vapor quality increases from 0.5 to 0.9, the evaporating temperature reaches the minimum of 211.37 K and COP drops sharply by 98.8% at a vapor quality of 0.7. In addition, when the outlet temperature on the high-pressure side of the fractionation heat exchanger is raised by 8.21 K, the evaporating temperature and COP are increased by 1.41 K and 21.3%, respectively. |
| Key words: auto-cascade refrigeration cycle fractionation heat exchanger natural refrigerant CO2 propane |
