| 摘要: |
| 针对R134a/CO2复叠制冷系统搭建实验台，研究不同工况下系统性能参数的变化规律，考查了压缩机效率对系统性能的影响，并与传统R404a系统性能进行比较。研究表明：在高温级冷凝温度48℃，低温级蒸发温度-30℃，冷凝蒸发器传热温差为3℃的工况下，CO2冷凝温度为-2℃时系统COP出现最大值，并在最优值±5℃内系统性能变化不大；不同实验工况下，CO2压缩机绝热效率最大偏差不超过4%，影响系统制冷量的主要因素是压缩机的容积效率；相同工况下，R134a/CO2复叠制冷系统性能可比常规R404a系统性能高3%。 |
| 关键词: 复叠制冷系统 实验研究 R134a/CO2 |
| DOI： |
| 投稿时间：2012-05-23
|
| 基金项目: |
|
| Experimental Research on the R134a/CO2 Cascade Refrigeration System |
| Shen Jiubing,Hu Bin,Qiu Jianwei,Cao Feng,Xing Ziwen |
| (School of Energy and power Engineering，Xi’an Jiaotong University) |
| Abstract: |
| A test rig of the R134a/CO2 cascade supermarket refrigeration system has been built up to get a comprehensive understanding of its performance. The results show that the maximum COP of the system occurred when the condensing temperature of the CO2 cycle was about -2℃, the condensing temperature of R134a and the evaporating temperature of CO2 was settled at 48℃ and -30℃ respectively with a temperature difference of 3℃. Moreover, the COP remained stable while the condensing temperature varied within a certain range of ±5℃. Results also show that the maximum deviation of the compressor adiabatic efficiency is within 4%, the main factor affecting the system cooling capacity is the compressor volumetric efficiency. And the performance of the cascade system could be 3% higher compared with that of conventional R404a refrigeration system at the same condition. |
| Key words: Cascade refrigeration system Experimental research R134a/CO2 |
