连接超导装置和外部电源的电流引线,是制冷系统的主要漏热源,决定着超导装置的运行效率。为实现漏热的最小化,对珀尔贴电流引线(Peltier current lead,简称PCL)进行了传热分析;引入热电参数的温度特性,建立了PCL的二维模型;采用有限元...连接超导装置和外部电源的电流引线,是制冷系统的主要漏热源,决定着超导装置的运行效率。为实现漏热的最小化,对珀尔贴电流引线(Peltier current lead,简称PCL)进行了传热分析;引入热电参数的温度特性,建立了PCL的二维模型;采用有限元法对传导冷却下的PCL进行漏热分析与结构优化,得到了电流引线的最优几何参数。分析发现引线室温端的漏热大约为低温端的2倍;忽略热电参数的温度特性将使几何参数偏离最佳值,造成额外的制冷负荷。展开更多
The effective properties of thermoelectric composites are well known to depend on boundary conditions, which causes the macro performance of thermoelectric composite to be difficult to assess. The overall macro-perfor...The effective properties of thermoelectric composites are well known to depend on boundary conditions, which causes the macro performance of thermoelectric composite to be difficult to assess. The overall macro-performance of multilayered thermoelectric medium is discussed in this paper. The analytical solutions are obtained, including the heat flux, temperature, electric potential, and the overall energy conversion efficiency. The results show that there are unique relationships between the temperature/electric potential and the electric current/energy flux in the material, and whether the material is independent of or embedded in thermoelectric composites. Besides, the Peltier effect at the interface can significantly improve the overall energy conversion efficiency of thermoelectric composites. These results provide a powerful tool to analyze the effective behaviors of thermoelectric composites.展开更多
文摘连接超导装置和外部电源的电流引线,是制冷系统的主要漏热源,决定着超导装置的运行效率。为实现漏热的最小化,对珀尔贴电流引线(Peltier current lead,简称PCL)进行了传热分析;引入热电参数的温度特性,建立了PCL的二维模型;采用有限元法对传导冷却下的PCL进行漏热分析与结构优化,得到了电流引线的最优几何参数。分析发现引线室温端的漏热大约为低温端的2倍;忽略热电参数的温度特性将使几何参数偏离最佳值,造成额外的制冷负荷。
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11232007 and 11202099)the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)+1 种基金State Key Laboratory of Mechanics and Control of Mechanical Structures,China(Grant No.MCMS-0215G01)the Fundamental Research Funds for the Central Universities,China(Grant No.NS2016008)
文摘The effective properties of thermoelectric composites are well known to depend on boundary conditions, which causes the macro performance of thermoelectric composite to be difficult to assess. The overall macro-performance of multilayered thermoelectric medium is discussed in this paper. The analytical solutions are obtained, including the heat flux, temperature, electric potential, and the overall energy conversion efficiency. The results show that there are unique relationships between the temperature/electric potential and the electric current/energy flux in the material, and whether the material is independent of or embedded in thermoelectric composites. Besides, the Peltier effect at the interface can significantly improve the overall energy conversion efficiency of thermoelectric composites. These results provide a powerful tool to analyze the effective behaviors of thermoelectric composites.