密闭空间分离式两级热电制冷器瞬态特性分析  

Analysis on transient characteristics of separated two-stage thermoelectric cooler in confined space

作　　者：孟凡凯[1] 徐辰欣 陈华伟[1] MENG Fankai;XU Chenxin;CHEN Huawei(College of Power Engineering,Naval University of Engineering,Wuhan 430033,China)

机构地区：[1]海军工程大学动力工程学院,湖北武汉430033

出　　处：《华中科技大学学报（自然科学版）》2024年第4期64-70,共7页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(11974429);海军工程大学自主研发计划资助项目(2022502210)。

摘　　要：基于有限时间热力学,建立了工作在密闭空间中的分离式两级热电制冷装置瞬态模型,给出了瞬态性能的计算方法,得到了制冷空间温度、模块温差、输入功率、制冷系数等随时间的变化规律.分析了热电制冷器的工作电流和热电臂长度等关键参数对制冷空间稳定温度、制冷量和制冷系数的影响,并与串联式两级制冷器性能进行了对比.结果表明:相比串联式两级热电制冷器,分离式制冷器的初始制冷系数提高了3.57%,无热源非绝热模型和有热源非绝热模型在300 s处制冷系数分别提高了5.72%和4.11%,空间温度分别降低了5.58%和3.09%;通过对工作电流的优化,无热源绝热模型和非绝热模型空间温度可分别降低至-29.03℃和8.98℃.Based on finite time thermodynamics,a transient model of separated two-stage thermoelectric cooler working in a confined space was established.The calculation method of transient performance was given,and the variation rules of space temperature,module temperature difference,input power,and coefficient of performance with time were obtained.The effects of key parameters such as the working current and the length of the thermoelectric leg on the stable temperature,cooling rate and coefficient of performance of the cooling space were analysed,and compared with two-stage cooler in series.Results show that compared with the two-stage thermoelectric cooler in series,the initial coefficient of performance of the separated cooler is increased by 3.57%.The coefficients of performance of the non-adiabatic model without heat source and the non-adiabatic model with heat source are increased by 5.72%and 4.11%at 300 s,respectively,and the space temperature is decreased by 5.58%and 3.09%respectively.The space temperature of adiabatic model and non-adiabatic model without heat source can be reduced to-29.03℃and 8.98℃respectively by optimization of working current.

关 键 词：两级热电制冷器 分离式 瞬态特性 密闭空间 性能优化 有限时间热力学 

分 类 号：TB66[一般工业技术—制冷工程]