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设计了蒸发器盘管排列密度可以改变的直接蒸发冰盘管蓄冷装置,在高、中、低三种盘管排列密度情况下,进行了蓄冷槽内载冷剂在自然对流和强制对流下的静态和动态蓄冷实验,研究了盘管排列密度和蓄冷状态对蓄冷速率的影响。结果显示:高密度系统平均蓄冷速率较低密度系统提高27.9%以上,动态系统平均蓄冷速率较静态系统提高2%左右。 相似文献
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In this paper thermal performance of graphite-based sensible heat storage system with embedded helical coil in rectangular shell was studied. Plain water at four flow rates (0.25 LPM–1.0 LPM) and four inlet temperatures (60°C–90°C) was passed through the graphite bed and charging time was measured. Expanded graphite/water suspension and Al2O3/water nanofluid were also used to study charging behavior of graphite. Results showed that charging time of packed bed was reduced with increase in flow rate and inlet temperature of heat transfer fluid. Charging time using expanded graphite/water solution and nanofluid was 14.2% and 21.2% lesser than water.Abbreviations: hi: internal heat transfer coefficient (W m?2 K?1); HTF: Heat transfer fluid; ho: External heat transfer coefficient (W m?2 K?1); LPM: liter per minute; k: thermal conductivity (W m?1 K?1); TSU: Thermal storage unit 相似文献
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以Du Pont公司的商用Teflon FEP A型薄膜为例,通过热脉冲技术、等温表面电位衰减测量和开路热刺激放电电流谱分析等实验结果,讨论了经常温和高温电晕充电后样品厚度对薄膜驻极体的沉积电荷密度、薄膜驻极体的内电场、体电导率以及电荷储存稳定性的影响.通过热脉冲技术组合电导率温度曲线的测量,研究了在不同温度条件下样品厚度对沉积电荷层的平均电荷重心移动的影响.结果表明:在充电参数一定的条件下,随着膜厚的降低,储存电荷密度上升,但电荷稳定性有所下降.因此,合理地调控薄膜厚度,可以有效地优化驻极体的电荷储存能
关键词:
厚度
驻极体
电荷储存能力
电荷稳定性 相似文献