| R290/CO2自然工质低温复叠式制冷循环理论分析 |
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| 引用本文： | 宁静红,马一太,李敏霞.R290/CO2自然工质低温复叠式制冷循环理论分析[J].天津大学学报(自然科学与工程技术版),2006,39(4):449-453. |
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| 作者姓名： | 宁静红 马一太 李敏霞 |
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| 作者单位： | 天津大学热能研究所,天津300072 |
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| 摘 要： | 介绍了低温环境下采用自然工质R290和CO2的复叠式制冷循环。分析了R290和CO2的物性特征，通过对R290／CO2复叠式制冷循环的理论分析，在一定的蒸发温度和冷凝蒸发器传热温差下，计算出循环存在最优的低温循环冷凝温度和最优质量流量比；为提高循环效率和保证循环的安全运行。应尽可能地升高蒸发温度、降低冷凝温度和减少冷凝蒸发器的传热温差，可以看出R290／CO2的复叠式制冷循环在低温制冷条件下有很好的发展前景．
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| 关 键 词： | 复叠式制冷循环 效率 质量流量比 |
| 文章编号： | 0493-2137（2006）04-0449-05 |
| 收稿时间： | 2004-07-06 |
| 修稿时间： | 2004-07-062004-09-20 |
Theoretical Analysis of R290/CO2 Natural Refrigerants Cascaded Refrigeration Cycle for Low Temperatures |
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| NING Jing-hong,MA Yi-tai,LI Min-xia.Theoretical Analysis of R290/CO2 Natural Refrigerants Cascaded Refrigeration Cycle for Low Temperatures[J].Journal of Tianjin University(Science and Technology),2006,39(4):449-453. |
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| Authors: | NING Jing-hong MA Yi-tai LI Min-xia |
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| Institution: | Thermal Energy Research Institute, Tianjin University, Tianjin 300072, China |
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| Abstract: | A cascaded refrigeration cycle is introduced, which uses natural refrigerants of R290 and CO2 for low temperatures. The properties of R290 and CO2 are analyzed. Through theoretical analysis of R290/CO2 natural refrigerants cascaded refrigeration cycle, an optimum mass flow rate ratio and an optimum condensation temperature of low temperature cycle part are calculated at a definite evaporation temperature and heat-transfer temperature difference of condenser-evaporator. For enhancing the efficiency of cycle and ensuring the operation safety, it is necessary to increase evaporation temperature, decrease condensation temperature, and reduce heat-transfer temperature difference of condenser-evaporator. It can be concluded that R290/CO2 natural refrigerants cascaded refrigeration cycle has a good future. |
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| Keywords: | R290/CO2 |
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