摘要
运行于户外周期性环境条件下的热控系统在工业领域有重要应用价值,降低系统能耗和提高温控效果是其性能改进关键所在.为此,采用实验和仿真手段研究了热控系统围护结构中相变材料(PCM)对系统热控效果的影响.典型气象日研究结果表明,相较于聚苯乙烯,PCM在广州地区能显著降低系统能耗(75.4%)、目标表面温度波动幅度(76.1%)和轴向温差(56.9%),在南京和吐鲁番地区可分别降低目标表面温度波动幅度41.3%和30.6%,但对系统能耗和目标轴向温差无改善;典型气象年结果表明,PCM在广州地区同样表现出热控优势,但热控效果对控温设定点、PCM相变范围和环境温度波动有很强的依赖性,当所选PCM相变范围包含控温设定点且与环境温度波动范围一致时,PCM能最大限度提高热控效果.
Thermal control systems operating under periodic outdoor ambient conditions have numerous important applications in the industrial fields,and reducing system energy consumption and enhancing temperature control effects are key to their performance improvement. Therefore,the influences of phase change material( PCM) in the envelope of a thermal control system on thermal control effects were studied by means of experiment and simulation.The results of the typical meteorological day show that,compared with polystyrene,PCM can significantly reduce system energy consumption( by 75. 4%),surface temperature fluctuation( by 76. 1%) and axial temperature difference( by 56. 9%) of the object in Guangzhou. In Nanjing and Turpan,the surface temperature fluctuationcan be reduced by 41. 3% and 30. 6% respectively,no improvement is observed in system energy consumption and axial temperature difference. The results of the typical meteorological year indicate that PCM also exhibits the advantages of thermal control in Guangzhou,but thermal control effects are strongly dependent on the temperature control setpoint,phase change range and the fluctuation of the ambient temperature. When the phase change range of the selected PCM covers the setpoint and the fluctuation range of the ambient temperature,PCM can maximize thermal control effects.
基金
国家自然科学基金(51576188)资助
关键词
周期性环境条件
热控系统
相变材料
能耗
控温效果
periodic ambient conditions
thermal control system
phase change material
energy consumption
temperature control effect
