| 摘要: |
| 本文理论分析了影响CO2微通道蒸发器制冷能力的关键因素，搭建CO2微通道蒸发器测试实验台，采用CO2电子膨胀阀实现过热度调节，重点研究了蒸发器出口过热度对制冷能力以及出风温度的影响。研究表明：相比于其他制冷剂，CO2出口过热度对蒸发器制冷能力的影响较大，蒸发器的性能随出口过热度的减小而提升，随着过热度的减小，制冷能力的提升存在3个具有显著差异的阶段，系统中蒸发器的性能随过热度减小最多提升57.9%。此外，采用了红外线热像仪拍摄和均布热电偶的方法得到出风温度和蒸发器表面温度的分布规律，结果表明出风温度随过热度的减小有更好的均匀性。 |
| 关键词: 微通道蒸发器 过热度 天然制冷剂 CO2 |
| DOI： |
| 投稿时间：2017-06-26
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| 基金项目: |
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| Effect of Superheat on the Performance of CO2 Micro-channel Evaporator |
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Yu Binbin1, Wang Dandong1,2, Chen Jiangping1,2
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| (1.Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University;2.Shanghai High Efficiency Cooling System Research Center) |
| Abstract: |
| As a natural refrigerant, CO2 has received increasing attention from the international community, particularly in the European market, and domestic demand is also increasing. This study analyzes the key factors influencing the cooling capacity of a CO2 micro-channel evaporator, where a CO2 micro-channel evaporator test bench was built and a superheat adjustment was realized using the CO2 electronic expansion valve. The results show that the CO2 superheat has a greater effect on the cooling capacity of the evaporator than other refrigerants, and the evaporator capacity is considerably improved with a decrease in superheat, the rate of increase can be categorized into three obvious periods with different characteristics. The increase in evaporator capacity described in this study can reach up to 57.9%. In addition, thermocouples and infrared thermal imaging were used to obtain the distribution of outlet air temperatures, where the outlet air temperatures achieve better uniformity with a decrease in superheat. |
| Key words: micro-channel evaporator superheat natural refrigerant CO2 |
