共查询到18条相似文献,搜索用时 196 毫秒
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热电制冷(TEC)已成为制冷领域的一个重要发展方向,但是由于其转换效率过低且材料成本较高,目前难以得到广泛应用。对热电制冷技术进行了简要介绍,并综述了热电制冷技术的研究进展,包括热电材料、结构优化和散热方式。讨论并分析了有机热电材料和无机热电材料的热电性能、不同结构设计所导致的性能系数、不同散热方式对制冷效率的影响。最后,对热电制冷技术的优化进行了简单总结,只有不断提高热电材料的优值系数,并选择合适的结构设计和散热方式,才能使热电制冷技术在各个领域拥有更大的发展空间。 相似文献
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随着电子设备不断向小型化、集成化发展,热电制冷技术作为一种有效的主动冷却方法被广泛用于重要部件的温度控制。为了获得最佳的制冷效果,文中针对散热受限条件下的CCD芯片热电制冷系统非稳态过程,建立了一个数值分析模型。分析结果表明:在散热受限时,热电制冷系统的传热过程长时间处于非稳态过程;在不超过最大制冷电流的条件下,增大制冷电流可以提高制冷效果,但是大的制冷电流可能出现温度回升的现象;虽然热端散热能力的提高可以改善制冷效果,但是存在一个极限值,这与热电制冷器(TEC)的优值系数有关;当系统载荷发生变化时,合理改变制冷电流和热端散热能力可以提高系统的温度稳定性,其中制冷电流对系统温度稳定性的影响更大。 相似文献
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基于热电制冷的大功率LED散热性能分析 总被引:5,自引:0,他引:5
提出了一种新型的基于热电制冷的大功率LED热管理方法。这种大功率LED阵列模块采用板上封装技术制造。为了解决散热问题,采用了热电制冷器将LED芯片产生的热量转移到周围的环境中。利用热电偶测量了大功率LED阵列模块在不同工作条件下的温度分布,LED的光学性能则通过光强分布测试仪来测试。结果表明,这种采用热电制冷的大功率LED阵列封装模块能够显著降低器件的工作温度,与不采用热电制冷器相比,基板温度能够降低36%以上,光学性能测量表明LED阵列模块的发光效率达到30.18lm/W。 相似文献
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高压大功率变频器的两种冷却方式比较 总被引:1,自引:1,他引:0
本文论述了高压大功率变频器环境散热问题,并对密闭式空调冷却和空-水冷却热交换装置两种散热方式作为了对比分析,作者还通过应用实例证明采用空一水热交换装置方案具有良好的综合性价比优势,可节约大量的投资成本和运行费用,符合系统化节能、环保的要求。 相似文献
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M. De Blas J. Appelbaum J. L. Torres A. García E. Prieto R. Illanes 《Progress in Photovoltaics: Research and Applications》2003,11(7):467-479
The use of renewable energy sources is usually a reliable alternative in rural areas and developing countries, where the grid line does not exist or is at a great distance. In this work, the characteristics and working conditions of a refrigeration facility designed for cooling down an expected daily production of 150 l of milk are analyzed. The facility is a stand‐alone, direct‐coupled system where 20 photovoltaic modules, 120 Wp each, power two permanent magnet, direct current motors of 24 V, 650 W. Each motor drives a separate cooling system compressor, which provides the flexibility to operate the equipment with one or two motors and with various interconnections of the PV modules, depending on the available irradiance level and the thermodynamic state of the system. The photovoltaic energy obtained during daylight hours is stored in the form of sensible and latent heat of frozen water in a tank surrounding a milk container. Thermodynamic analysis of the system shows that the autonomy of the system is 2·5 consecutive cloudy days if the available stored ice energy is 80% of the nominal capacity of the water/ice tank. Results of the refrigeration efficiency are similar to those obtained by other commercial refrigeration facilities powered by a photovoltaic array, including batteries. Copyright © 2003 John Wiley & Sons, Ltd. 相似文献
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从基础理论出发,构建出一套从机柜到室外环境的相变换热制冷循环系统,使用制冷剂气泵、制冷剂液泵、蒸发冷凝及重力热管等技术,高效地将服务器散发的热量搬运到室外环境中,整个过程没有中间换热环节,将蒸发温度和冷凝温度的差值做到最小。试验测试结果表明,在全国核心城市数据中心应用此套制冷方案,全年平均能效比达到20以上。同时,该系统还具有峰值能效高、适用性、兼容性等优势,进一步降低数据中心的建设和运行成本。 相似文献
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根据太阳能半导体制冷特点,给出了带储能装置并能进行能量匹配数控的制冷与蓄冷并重、热电制冷装置模块化的太阳能半导体制冷空调系统。在研究较成熟的常温送风空调蓄冷技术和蓄冷材料的基础上,采用示差扫描量热法(DSC法)对KCL共晶盐的相变温度、相变潜热进行实验测试。研究结果表明,KCL共晶盐可作为低温送风空调蓄冷介质,既弥补了太阳能半导体制冷间歇不连续的缺点,又使蓄冷技术能在医药、食品等行业对环境温度有特殊要求(送风温度低于0℃)的场所得到应用,并可扩大到小型移动便携制冷器蓄冷技术应用范围。 相似文献
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Modi Jiang Qingchen Shen Jingyi Zhang Shun An Shuai Ma Peng Tao Chengyi Song Benwei Fu Jun Wang Tao Deng Wen Shang 《Advanced functional materials》2020,30(14)
Human skin shows self‐adaptive temperature regulation through both enhanced heat dissipation in high temperature environments and depressed heat dissipation in cold environments. Inspired by such thermal regulation processes, an interfacial material system with self‐adaptive temperature regulation in the solar‐driven interfacial evaporation system, which can exhibit automatic temperature oscillation to enable pyroelectricity generation while producing water vapor, is reported. The bioinspired interface system is designed with the combination of a thermochromism‐based temperature regulator consisting of tungsten‐doped vanadium dioxide nanoparticles and a polymeric pyroelectric thin film of polyvinylidene fluoride. Under the simulated solar illumination with power density of 1.1 kW m?2, the bioinspired interfacial evaporation system achieves a self‐adaptive temperature oscillation with the maximum temperature difference of ≈7 °C and this system can simultaneously generate water vapor as well as electricity with an evaporation efficiency of 71.43% and a maximum output electrical power density of 104 µW m?2, respectively. The study demonstrates a design of thermal management at the interface of solar‐driven evaporation system to exhibit a self‐adaptive temperature oscillation and offers an alternative approach for the multifunctional harvesting of solar energy. 相似文献