摘要
优化匹配出口阻抗是热声制冷机获得最佳性能的关键点之一。本文提出了一种电机调相式热声制冷机方案,它利用直线发电机提供热声制冷机高效工作所需的相位,同时回收制冷机出口膨胀功并转换成电能,提高整机效率。与现有技术相比,本方案的热声制冷机具有制冷效率较高、结构简单的优点,适用于冷量比较大、制冷温度较高、膨胀功相对较多的情形。此外,还可满足热驱动热声冷电联产的应用需求。本文基于经典热声理论,先计算分析了直线发电机入口阻抗、制冷机入口压比对制冷性能的影响。在此基础上搭建实验台进行了初步实验,在平均压力3 MPa、工作频率55 Hz下,获得了110 K制冷量158.3 W,制冷机相对卡诺效率为16.1%,将回收的电功计入后整机效率达到了31.4%。
Optimizing outlet impedance of tliermoacoustic cryocooler is one of the key to obtain the best cryocooler performance.In this paper,a tliermoacoustic cryocooler with linear motor type phase adjuster is proposed.The linear motor can not only provide a proper phase angle required by a good operation of the tliermoacoustic cryocooler,but also convert the expansion work into electricity.Thus,the efficiency of the whole system can be greatly improved.Compared with current technology,this device may have advantages on higher cooling efficiency and simpler structure,which is suitable for large cooling power,high cooling temperature and much expansion work fields.Moreover,it is believed to meet the requirement for heat-driven combined cooling and power application.Based on classical tliermoacoustic theories,we analyze the influence of inlet impedance of linear alternator and inlet pressure ratio of cryocooler on the cryocooler performance.On this basis,we build a test platform and construct preliminary experiments.With an average pressure of 3 MPa and a working frequency of 55 Hz,the cryocooler can obtain a cooling power of 158.3 W at 110 K with a relative Carnot efficiency of 16.1%.When electric power is included,a total exergy efficiency of 31.4%is achieved.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2016年第3期459-465,共7页
Journal of Engineering Thermophysics
基金
国家自然科学基金项目(No.51476183)
北京市自然科学基金(No.3132034)
关键词
热声制冷机
直线发电机
调相
压比
thermoacoustic cryocooler
linear alternator
phase adjusting
pressure ratio
