CAJ | 학술논문

基于统计理论推导的铁磁材料的磁热参数,建立了不可逆回热式磁Brayton循环数学模型.对于顺磁材料作工质的情形,获得了循环放热量Q_H、制冷量Q_C、回热量及性能系数δ_(COP)的表达式的解析解.以铁磁材料钆作工质为例,数值研究了循环室温区的制冷性能,考察了归一化温度α、回热不平衡量Q_R及磁化过程不可逆度η对循环有效制冷量Q_(eff).C及δ_(COP)的影响,并获得了不同外部磁场H_1条件下循环最大温跨δ_T.max.数值结果显示:Q_(eff).C随α的增加而增加;当α≥0.6或Q_R≥0时,循环均能获得良好的制冷性能;磁化过程的不可逆因素会使得δ_(COP)迅速下降.
기우통계이론추도적철자재료적자열삼수,건립료불가역회열식자Brayton순배수학모형.대우순자재료작공질적정형,획득료순배방열량Q_H、제랭량Q_C、회열량급성능계수δ_(COP)적표체식적해석해.이철자재료구작공질위례,수치연구료순배실온구적제랭성능,고찰료귀일화온도α、회열불평형량Q_R급자화과정불가역도η대순배유효제랭량Q_(eff).C급δ_(COP)적영향,병획득료불동외부자장H_1조건하순배최대온과δ_T.max.수치결과현시:Q_(eff).C수α적증가이증가;당α≥0.6혹Q_R≥0시,순배균능획득량호적제랭성능;자화과정적불가역인소회사득δ_(COP)신속하강.
On the basis of magneto-thermo parameters of ferromagnetic material deduced by the statistic theory,a mathematical model for the irreversible regenerative magnetic Brayton cycle was established.For the case of paramagnetic material,the analytic solution of heat release Q_H,refrigeration capacity Q_C,regenerative heat,and coefficient of performance δ_(COP) were achieved.The numerical study on the refrigeration performance in room-temperature regions of the cycle was conducted for ferromagnetic material,Gadolinium.The influence of dimensionless temperature α,imbalance regenerative heat Q_R.and irreversible degree η on effective refrigeration capacity Q_(eff).C and δ_(COP) was examined,and maximum temperature span δT,max under different external magnetic field H_1 of the cycle was obtained.The numerical results show that Q_(eff),C increases with the increase of α,and the cycle has high refrigeration performance when α≥0.6 or Q_R≥0.In addition,δ_(COP) of the cycle decreases rapidly because of irreversible factors in magnetizing processes.