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浙江大学学报(工学版)  2023, Vol. 57 Issue (1): 55-62    DOI: 10.3785/j.issn.1008-973X.2023.01.006
机械与能源工程     
含发热元件密闭空间热电制冷器瞬态特性
孟凡凯(),徐辰欣,孙悦桐
海军工程大学 动力工程学院,湖北 武汉 430033
Transient characteristic of thermoelectric cooler with heating element in confined space
Fan-kai MENG(),Chen-xin XU,Yue-tong SUN
College of Power Engineering, Naval University of Engineering, Wuhan 430033, China
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摘要:

为了研究密闭空间中发热元件对热电制冷器瞬态特性的影响,基于有限时间热力学理论,建立工作在含发热元件制冷空间中的热电制冷器计算模型. 采用热阻网络分析方法,分析不同工况下关键参数对热电制冷器瞬态特性的影响,得到制冷空间温度、制冷系数、制冷量等性能参数随时间的变化规律. 分别改变发热元件功率、工作电流、冷却水流速和填充系数,对比分析不同工况下的最低制冷温度和制冷系数变化,得到热电制冷器工作参数的瞬态特性. 搭建水冷式热电制冷器的测试平台,开展密闭空间热电制冷器的瞬态特性测量实验. 结果表明,当发热元件功率分别为0.95、4.85和13.3 W时,仿真计算温降分别为8.96、8.33和6.94 K,实验测得温降分别为6.75、5.63和4.00 K,温度变化趋势一致,验证了计算模型.

关键词: 热电制冷瞬态特性制冷温度密闭空间发热元件    
Abstract:

A transient model of thermoelectric refrigerator working in a cooling space with a heating element was established based on the finite-time thermodynamic theory in order to analyze the influence of heating element on the transient characteristics of thermoelectric cooler in confined space. The influence of key parameters on the transient performance of the thermoelectric refrigerator under different working conditions was analyzed by using the thermal resistance network analysis method. The variation laws of performance parameters such as cooling space temperature, cooling coefficient and cooling capacity with time were obtained. The heating element power, working current, cooling water flow rate and filling coefficient were changed respectively. The changing laws of the minimum cooling temperature and the cooling coefficient under different working conditions were compared and analyzed. The transient characteristics of the working parameters of the thermoelectric cooler were obtained. A test platform for a water-cooled thermoelectric cooler was constructed. The transient characteristic experiment of thermoelectric cooler in confined space was developed. Results showed that the simulation temperature drop was 8.96, 8.33 and 6.94 K respectively when the heating element power was 0.95 W, 4.85 W and 13.3 W. The experimentally measured temperature drop was 6.75, 5.63 and 4.0 K, respectively. The temperature trend of experiment and simulation was consistent. The experimental results verified the computational model.

Key words: thermoelectric cooling    transient characteristic    cooling temperature    confined space    heating element
收稿日期: 2022-04-11 出版日期: 2023-01-17
CLC:  TB 66  
基金资助: 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(425317T01C)
作者简介: 孟凡凯(1982—),男,副教授,硕导,从事热电发电技术、热电制冷技术、电子设备热分析技术、低温余热利用技术等研究. orcid.org/0000-0003-4659-3609. E-mail: mfk927@qq.com
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引用本文:

孟凡凯,徐辰欣,孙悦桐. 含发热元件密闭空间热电制冷器瞬态特性[J]. 浙江大学学报(工学版), 2023, 57(1): 55-62.

Fan-kai MENG,Chen-xin XU,Yue-tong SUN. Transient characteristic of thermoelectric cooler with heating element in confined space. Journal of ZheJiang University (Engineering Science), 2023, 57(1): 55-62.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2023.01.006        https://www.zjujournals.com/eng/CN/Y2023/V57/I1/55

图 1  制冷空间与制冷器的示意图
图 2  热电制冷器热阻网络
α/(10?4 V·K?1) λ/(W·m?1·K?1) μ/(10?4 V·K?1) σ/(10?4 m·Ω?1) A/mm2
4.241 8 1.647 4 1.008 9 9.038 1 1.612 9
表 1  热电模块的物性参数和几何参数
图 3  制冷空间温度与时间的关系
图 4  制冷量与时间的关系
图 5  端面温度与时间的关系
图 6  制冷系数与时间的关系
图 7  最低制冷温度与工作电流的关系
图 8  制冷系数与工作电流的关系
图 9  最低制冷温度与冷却水流速的关系
图 10  制冷系数与冷却水流速关系
图 11  最低制冷温度与填充系数的关系
图 12  制冷系数与填充系数的关系
图 13  制冷量与填充系数的关系
图 14  密闭空间水冷式热电制冷器实验装置的结构图
图 15  密闭空间水冷式热电制冷器的实验装置
图 16  制冷空间温度随时间的变化
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