基于热管散热的串联式两级热电制冷器制冷性能综合分析

Comprehensive analysis of refrigeration performance of series two-stage thermoelectric refrigerator based on heat pipe heat dissipation

针对基于热管散热的串联式两级热电制冷器,建立了有限时间热力学模型。通过热阻分析的方法建立了热电制冷器的一维热阻网络图并给出了冷热端热阻的具体计算方法。以制冷率、制冷系数、热力学完善度和极限制冷温差为性能指标,用数值算例的方法研究了工作电流、热电单元分配比、热电单元横截面积、热电单元长度、热管几何参数(冷凝段长度和管芯厚度)和制冷温差等关键参数对热电制冷器综合性能的影响规律。

A finite-time thermodynamic model is established for a series two-stage thermoelectric cooler based on heat pipe heat dissipation.The one-dimensional thermal resistance network diagram of the thermoelectric cooler is built based on thermal resistance analysis to calculate the thermal resistance of the hot and cold ends.Taking refrigeration rate,coefficient of performance(COP),thermodynamic perfectibility and extreme cooling temperature difference as performance indicators,a numerical example is used to study the influences of key parameters on the comprehensive performance of thermoelectric coolers.The key parameters include working current,thermoelectric unit distribution ratio,thermoelectric unit cross-sectional area,thermoelectric unit length,heat pipe geometric parameters(condensing section length and tube core thickness),and cooling temperature difference.