泡沫铁对石蜡相变储热过程的影响

doi:10.12028/j.issn.2095-4239.2019.0161

摘要/Abstract

摘要：

发展储能材料可提高太阳能的利用效率，石蜡是一种储热密度高、相变潜热大的相变储能材料，但热导率较低。本工作采用泡沫铁来增强石蜡相变储能材料的导热性能，通过对不同厚度相变储能材料的制备及其在干燥介质温度70 ℃条件下升温过程的测试，探究石蜡及泡沫铁/石蜡复合相变储能材料(PCM)的储热性能。结果表明：添加泡沫铁能有效改善石蜡导热系数差的问题，提高储热过程中的传热速率，缩短相变持续时间。相比对照组，厚10 mm和15 mm的复合相变储能材料石蜡质量分数分别减小了5.56%和3.68%，开始相变的时间分别缩短了15 min和17 min，相变持续时间分别缩短了42 min和31 min。10 mm和15 mm的复合相变储能材料的储热密度分别为139.75 J/cm³和143.85 J/cm³，相比对照组分别减小了8.81%和8.01%；储热速率分别为3.05 J/s和3.96 J/s，是相应对照组的1.22倍和1.11倍。

关键词: 相变储能材料, 石蜡, 泡沫铁, 储热密度, 储热速率

Abstract:

The development of energy storage materials can improve the solar energy utilization efficiency. Paraffin wax is a phase change energy storage material that exhibits high heat storage density and latent heat of phase change but low thermal conductivity. Iron foam was used to enhance the thermal conductivity of the paraffin-based phase change energy storage materials (PCMs). Further, the thermal storage properties of paraffin and iron foam/paraffin composite PCM were investigated through by preparing PCMs of different thickness and by testing the temperature increase at a drying medium temperature of 70 °C. The results reveal that the addition of iron foam can effectively improve the thermal conductivity of the iron foam/paraffin composite PCM, increase the heat transfer rate, and reduce the heat transfer duration. When compared with the control group, the mass fractions of paraffin in the composite (with thicknesses of 10 and 15 mm) decreased by 5.56% and 3.68%, respectively, and the time of phase change commencement was reduced by 15 and 17 min, respectively. The phase change duration was reduced by 42 and 31 min, respectively. The heat storage densities of the 10- and 15-mm composite PCM were 139.75 and 143.85 J·cm^-3, respectively, which were 8.81% and 8.01% lower than those of the control group. The heat storage rates were 3.05 and 3.96 J·s^-1, respectively, which were 1.22 and 1.11 times higher than those of the corresponding control group.

Key words: phase change energy storage materials, paraffin, iron foam, heat storage density, heat storage rate

中图分类号:

TK 02

万倩, 肖浩南, 钱京, 何正斌, 伊松林. 泡沫铁对石蜡相变储热过程的影响[J]. 储能科学与技术, 2020, 9(1): 94-100.

WAN Qian, XIAO Haonan, QIAN Jing, HE Zhengbin, YI Songlin. Influence of iron foam on paraffin phase change heat storage process[J]. Energy Storage Science and Technology, 2020, 9(1): 94-100.

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序号	设备名称	型号	生产厂家
1	智能型电热板	SKML-1.5-4	北京昶信科技发展有限公司
2	干燥箱	BPG-9050AH	北京汇安铭科科技发展有限公司
3	温度巡检仪	XSL/D-16ES2V0	北京中旺新业电子技术有限公司
4	传感器	K型铜-康铜热电偶	北京航科金星自动化仪表有限公司
5	导热系数测量仪	DRE-2C	湘潭市仪器有限公司
6	差示扫描量热仪	Q2000	American TA Company

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