| Influence of Zeotropic Mixtures' Temperature Gliding on the Performance of Heat Transfer in Condenser or Evaporator |
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| 作者姓名： | 赵力 高攀 |
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| 作者单位： | School of Mechanical Engineering Tianjin University，Tianjin 300072，China，School of Mechanical Engineering，Tianjin University，Tianjin 300072，China |
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| 基金项目： | Supported by National Natural Science Foundation of China( No. 50476062) . |
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| 摘 要： | Many zeotropic refrigerant mixtures are proposed as alternatives to some chlorofluorocar-bons (CFCs) and hydrochlorofluorocarbons ( HCFCs). An advantage of zeotropic mixtures is the possibility of reduction in entropy generation by matching the temperature glidings of refrigerant and heat-transfer fluid in both condenser and evaporator. Zeotropic mixtures are compared with pure re-frigerants to evaluate their exergetic losses. On the other hand, the special phenomena which result from temperature gliding are proved by experiments. A simple equation is obtained, to evaluate dif-ferent zeotropic mixtures' exergetic losses. The maximum flow rate of heat-transfer fluids is found in order that refrigerants phase change can be completed. Lastly, some examples of zeotropic mix-tures ( R407C, R405A and R414B) are given, and their exergetic losses and maximum flow rate of heat-transfer fluids in condenser are forecasted.
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Influence of Zeotropic Mixtures' Temperature Gliding on the Performance of Heat Transfer in Condenser or Evaporator |
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| ZHAO Li,GAO Pan.Influence of Zeotropic Mixtures'''' Temperature Gliding on the Performance of Heat Transfer in Condenser or Evaporator[J].Transactions of Tianjin University,2005,11(6). |
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| Authors: | ZHAO Li GAO Pan |
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| Institution: | School of Mechanical Engineering, Tianjin University, Tianjin 300072, China |
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| Abstract: | Many zeotropic refrigerant mixtures are proposed as alternatives to some chlorofluorocar-bons (CFCs) and hydrochlorofluorocarbons ( HCFCs). An advantage of zeotropic mixtures is the possibility of reduction in entropy generation by matching the temperature glidings of refrigerant and heat-transfer fluid in both condenser and evaporator. Zeotropic mixtures are compared with pure re-frigerants to evaluate their exergetic losses. On the other hand, the special phenomena which result from temperature gliding are proved by experiments. A simple equation is obtained, to evaluate dif-ferent zeotropic mixtures' exergetic losses. The maximum flow rate of heat-transfer fluids is found in order that refrigerants phase change can be completed. Lastly, some examples of zeotropic mix-tures ( R407C, R405A and R414B) are given, and their exergetic losses and maximum flow rate of heat-transfer fluids in condenser are forecasted. |
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| Keywords: | zeotropic mixtures temperature gliding exergetic loss maximum flow rate |
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