用Langevin理论研究回热式室温磁制冷循环性能  

Research on Performance of Regenerative Room-Temperature Magnetic Refrigeration Cycle Through Magnetocaloric Parameter Deduced by Langevin Theory

作　　者：张艳[1] 俞炳丰[1] 高强[1] 王从飞[1] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《西安交通大学学报》2005年第3期247-251,共5页Journal of Xi'an Jiaotong University

摘　　要：在Langevin理论的基础上,结合统计力学、热力学知识推导出新的磁热参数表达式.以铁磁材料 Gd为例进行计算,分别与实验值、原磁热参数的计算值进行了比较,表明在室温范围内,磁热参数的新表达式与原表达式基本一致,提供了新的磁制冷循环研究途径.并依此参数的新表达式对回热式室温磁制冷循环进行数值计算.结果表明:高温热源温度越高,循环性能系数越小;随着低温热源温度的增加,高温热源温度的最大值升高;磁场强度越强,循环性能系越大,但其增长率减小.A new expression of magnetocaloric parameters, much more brief than original ones, was deduced using Langevin theory along with statistical mechanics and thermodynamics. The computation was conducted for Gadolinium. The comparisons between experiments and the results calculated from the original parameters were performed. The results show that the two sets of parameters are accordant well in the range of room temperatures. Moreover, a numerical simulation was carried out for the regenerative room-temperature magnetic refrigeration cycle based on the new parameters. The simulation results indicate that the coefficient of performance (ΕCOP) decreases with the increase of TH of the high-temperature heat reservoir. In addition, the maximum of TH increases while TL of low-temperature heat reservoir increases. A higher magnetic field can improve ECOP but the increase rate of ΕCOP reduces.

关 键 词：室温磁制冷 回热式 热源温度 循环性能 低温热源 数表 热力学 表达式 统计力学 最大值 

分 类 号：TB611[一般工业技术—制冷工程] TB61