汤姆逊效应对热电发电机驱动热电制冷机装置性能的影响  

The influence of Thomson effect on the performance of thermoelectric generator-driven thermoelectric cooler device

作　　者：冯元力[1,2,3] 陈林根[1,2,3] 孟凡凯[1,2,3] 孙丰瑞[1,2,3] 

机构地区：[1]海军工程大学热科学与动力工程研究室,湖北武汉430033 [2]海军工程大学舰船动力工程军队重点实验室,湖北武汉430033 [3]海军工程大学动力工程学院,湖北武汉430033

出　　处：《节能》2017年第7期12-18,共7页Energy Conservation

基　　金：国家自然科学基金(项目编号:51576207;11305266)

摘　　要：建立了包含汤姆逊效应的热电发电机驱动热电制冷机(TEG-TEC)装置热力学模型,运用非平衡热力学理论和数值计算方法进行了性能分析,对比考虑和不考虑汤姆逊效应2种情况,分析了汤姆逊效应对装置性能的影响。结果表明,汤姆逊效应使TEG-TEC装置性能降低,且降低幅度随热电发电机高温热源温度或制冷空间温度升高而减小。当热电发电机热节点温度和热电制冷机冷节点温度分别取450K和285K,热电单元比取0.5时,汤姆逊效应使制冷率降低29.98%,使制冷系数降低23.02%,使极限制冷温差降低11.35%。考虑到汤姆逊效应的影响,应当将有限数量的热电单元适当多地分配到热电发电机中。文中结论为实际TEG-TEC装置的设计和运行提供了理论指导。The thermodynamic model of thermoelectric generatordriven thermoelectric cooler( TEG-TEC) device with Thomson effect is established. Performance of the device is analyzed by applying nonequilibrium thermodynamic theory and numerical calculation method.The influences of Thomson effect on the performance are analyzed by comparing the performance characteristics of models with and without Thomson effect. The results showed that,Thomson effect degrade the performance of TEG-TEC device, and the degradation of performance decreases with the increase of thermoelectric generator heat source temperature and cooling space temperature. Thomson effect decreases the cooling load by 29. 98%,decreases COP by 23. 02%,decreases limit cooling temperature by 11. 35% when hot junction temperature of TEG is 450 K, cold junction temperature of TEC is 285 K, and ratio of number of thermoelectric elements is 0. 5. In the design of the device,limited-number thermoelectric elements should be more allocated appropriately to TEG when consider Thomson effect. The results can provide some theoretical guidelines for the design of TEG-TEC devices.

关 键 词：热电发电机 热电制冷机 联合热电装置 汤姆逊效应 性能分析 非平衡热力学 

分 类 号：TK01[动力工程及工程热物理]