| Second Law of Thermodynamics Analysis of TranscriticalCarbon Dioxide Refrigeration Cycle |
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| 作者姓名： | 杨俊兰 马一太 管海清 李敏霞 |
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| 作者单位： | ThermalEnergyResearchInstitute,TianjinUniversity,Tianjin300072,China |
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| 基金项目： | SupportedbytheSpecializedResearchFundfortheDoctoralProgramofHigherEducation (No .D0 2 0 0 10 5) |
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| 摘 要： | In order to identify the locations of irreversible loss within the transcritical carbon dioxide refrigeration cycle with an expansion turbine, a method with respect to the second law of thermodynamics based on exergy analysis model is applied. The effects of heat rejection pressures, outlet temperatures of gas cooler and evaporating temperatures on the exergy loss, exergy efficiency and the coefficient of performance (COP) of the expansion turbine cycle are analyzed. It is found that the great percentages of exergy losses take place in the gas cooler and compressor. Moreover, heat rejection pressures, outlet temperatures of gas cooler and evaporating temperatures have strong influence on the exergy efficiency, COP and the exergy loss of each component. The analysis shows that there exists an optimal heat rejection pressure corresponding to the maximum exergy efficiency and COP, respectively. The results are of significance in providing theoretical basis for optimal design and the control of the transcritical carbon dioxide system with an expansion turbine.
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| 关 键 词： | 二氧化碳 跨界制冷循环 能量分析 膨胀涡轮 能源效率 |
Second Law of Thermodynamics Analysis of Transcritical Carbon Dioxide Refrigeration Cycle |
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| YANG Jun-lan,MA Yi-tai,GUAN Hai-qing,LI Min-xia.Second Law of Thermodynamics Analysis of TranscriticalCarbon Dioxide Refrigeration Cycle[J].Transactions of Tianjin University,2004,10(3):179-183. |
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| Authors: | YANG Jun-lan MA Yi-tai GUAN Hai-qing LI Min-xia |
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| Abstract: | In order to identify the locations of irreversible loss within the transcritical carbon dioxide refrigeration cycle with an expansion turbine, a method with respect to the second law of thermodynamics based on exergy analysis model is applied. The effects of heat rejection pressures, outlet temperatures of gas cooler and evaporating temperatures on the exergy loss, exergy efficiency and the coefficient of performance (COP) of the expansion turbine cycle are analyzed. It is found that the great percentages of exergy losses take place in the gas cooler and compressor. Moreover, heat rejection pressures, outlet temperatures of gas cooler and evaporating temperatures have strong influence on the exergy efficiency, COP and the exergy loss of each component. The analysis shows that there exists an optimal heat rejection pressure corresponding to the maximum exergy efficiency and COP, respectively. The results are of significance in providing theoretical basis for optimal design and the control of the transcritical carbon dioxide system with an expansion turbine. |
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| Keywords: | carbon dioxide transcritical refrigeration cycle expansion turbine exergy analysis |
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