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| Thermodynamic Analysis and Comparison on Low Temperature CO_2-NH_3 Cascade Refrigeration Cycle | |
| 作者姓名： | 查世彤 马一太 申江 李敏霞 |
| 作者单位： | Refrigeration and Air-Conditioning Engineering Department，Energy Research Institute，Refrigeration and Air-Conditioning Engineering Department，Energy Research Institute Tianjin University of Commerce，Tianjin 300400，China，Thermal Energy Research Institute，School of Mechanical Engineering，Tianjin University，Tianjin 300072，China，School of Mechanical Engineering，Tianjin University，Tianjin 300072，China，Tianjin University of Commerce，Tianjin 300400，China，School of Mechanical Engineering，Tianjin University，Tianjin 300072，China |
| 摘 要： | Intheapplicationsofindustrialandcommercialrefrig erationsystem ,iftherequiredrefrigerationtemperatureisverylow ,theconventionalvaporcompressionsystemisdiffi culttomeettherequirementbecausewhenthedifferencebe tweentheevaporatingtemperatureandthecondensingtemper atureissohighthatitishardtofindarefrigeranttomeettheneedsasthecondensingpressureisnottoohighandtheevap oratingpressureisnottoolow .Whentherefrigeratingtemper atureisverylow ,thecascaderefrigerationcycleissuitabletobeused .Itcannotonlysat… |
Thermodynamic Analysis and Comparison on Low Temperature CO2-NH3 Cascade Refrigeration Cycle |
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| ZHA Shi-tong ,MA Yi-tai,SHEN Jiang,LI Min-xia.Thermodynamic Analysis and Comparison on Low Temperature CO_2-NH_3 Cascade Refrigeration Cycle[J].Transactions of Tianjin University,2003,9(3). | |
| Authors: | ZHA Shi-tong MA Yi-tai SHEN Jiang LI Min-xia |
| Institution: | 1. Refrigeration and Air-Conditioning Engineering Department, Tianjin University of Commerce, Tianjin 300400, China;Thermal Energy Research Institute, School of Mechanical Engineering, Tianjin University, Tianjin 300072,China 2. Thermal Energy Research Institute, School of Mechanical Engineering, Tianjin University, Tianjin 300072,China 3. Refrigeration and Air-Conditioning Engineering Department, Tianjin University of Commerce, Tianjin 300400, China |
| Abstract: | This paper is focused on the cascade refrigeration cycle using natural refrigerant CO 2-NH 3. The properties of refrigerants CO 2 and NH 3 are introduced and analyzed.CO 2 has the advantage in low stage of cascade refrigeration cycle due to its good characteristics and properties. The thermodynamic analysis results of the CO 2-NH 3 cascade refrigeration cycle demonstrates that the cycle has an optimum condensation temperature of low stage and also has an optimum flow rate ratio.By comparing with the R13-R22 and NH 3-NH 3 cascade refrigeration cycles, the mass flow rate ratio of CO 2-NH 3 is larger than those of R13-R22 and NH 3-NH 3, the theoretical COP of CO 2-NH 3 cascade refrigeration cycle is larger than that of the R13-R22 cascade cycle and smaller than that of the NH 3-NH 3 cascade cycle. But the real COP of CO 2-NH 3 cascade cycle will be higher than those of R13-R22 and NH 3-NH 3 because the specific volume of CO 2 at low temperature does not change much and its dynamic viscosity is also small. |
| Keywords: | CO 2-NH 3 cascade refrigeration cycle thermodynamic analysis |
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