热管式热电冷却通道结构设计与参数影响分析

Structural design and parameter influence analysis of heat pipe thermoelectric cooling channel

本文设计了一种热端基于热管散热的热电冷却通道结构,基于有限时间热力学理论,导出了热电制冷模块热端、冷端和管内冷源温度与管道长度关系的微分方程,得到了沿程温度变化规律。以制冷率密度和制冷系数为性能指标,通过数值模拟的方法,分析了输入电流、热源参数、热电模块参数、热管换热器参数等关键运行参数和设计参数对装置制冷性能的影响,并讨论了汤姆逊热对装置制冷性能的影响。结果表明:对于宽度为80 mm的管道,管内冷媒水流速为0.8 m·s^(-1),每米流程冷媒水温度下降0.24℃左右。考虑汤姆逊热时装置最大制冷率密度和最大制冷系数分别可达1.82 W·cm^(-2)和5.43,分别提升了13.75%和20.40%。

In this paper,a thermoelectric cooling channel structure based on heat pipe heat dissipation at the hot end was designed.Based on the finite-time thermodynamics theory,the differential equations of the relationship between the temperatures of the hot end,the cold end and the cold source in the tube of the thermoelectric refrigeration module and the length of the tube were derived,and the variation law of the temperature along the tube was obtained.Taking the cooling density and coefficient of performance(COP)as performance indicators,the influence of key operating parameters and design parameters such as input current,heat source parameters,thermoelectric module parameters and heat pipe heat exchanger parameters on the refrigeration performance of the device was analyzed by numerical simulation.In addition,the influence of Thomson heat on the refrigeration performance of the device was also discussed.The results show that for the pipe with a width of 80 mm,when the flow rate of frozen water in the pipe is 0.8 m s^(-1) and the length of the pipe is 10 m,the temperature of frozen water in each meter process decreases by about 0.24℃.Compared with ignoring Thomson heat under the same working condition,when considering Thomson heat,the maximum cooling density and maximum COP of the device can reach 1.82 W·cm^(-2) and 5.43,which are increased by 13.75%and 20.40%,respectively.