泡沫铁/石蜡复合相变储能材料放热过程及其热量传递规律

doi:10.19799/j.cnki.2095-4239.2019.0280

摘要/Abstract

摘要：

石蜡作为相变储能材料具有储能密度大的优势，但其导热率较低。以石蜡作为相变储能材料、金属泡沫铁作为导热增强材料，通过对泡沫铁/石蜡复合相变储能材料的制备及其放热过程测试，探究了两种厚度金属泡沫铁对石蜡放热过程的强化作用和传热过程。结果表明，泡沫铁能缩短石蜡放热时间，提高放热效率。相比对照组，厚10 mm和15 mm的泡沫铁/石蜡复合相变储能材料相变时间分别缩短了1/3和1/4，相变放热密度分别减小了1.60%和3.26%，两者的相变放热速率是相应对照组的1.44和1.27倍。同时，还对15 mm泡沫铁/石蜡复合相变储能材料放热过程中，对流换热系数与相变时间和材料温度的关系分别进行了模拟，得到相应的理论公式，该公式所求得的模拟值与实际值较接近，可用于预测不同放热时间或材料温度下复合相变储能材料的换热能力。

关键词: 太阳能干燥, 相变储能材料, 石蜡, 泡沫铁, 放热时间

Abstract:

As a phase change material (PCM), paraffin exhibits high energy storage density. However, its thermal conductivity is low. In this study, paraffin wax was used as the PCM, whereas iron foam was used as the thermal-conductivity-enhancing material. The heat transfer performance of two types of iron foam during the paraffin exothermic process was explored by preparing the iron foam/paraffin composite phase change energy storage material and conducting its exothermic process test. The results denote that iron foam can reduce the heat release time of paraffin and improve the heat release efficiency. The phase transition times of the iron foam/paraffin composite PCMs having thicknesses of 10 and 15 mm are reduced by 1/3 and 1/4, respectively, and the phase change heat release densities are reduced by 1.60% and 3.26%, respectively, whereas the phase change heat release rates are 1.44 and 1.27 times that of the corresponding control group. Simultaneously, during the heat release process of 15 mm iron foam/paraffin composite PCM, the relation between the convective heat transfer coefficient, phase transition time, and material temperature was simulated, and corresponding theoretical formulas were obtained. The simulated value obtained by this formula is similar to the measured value. Thus, this formula can be used to predict the convective heat transfer coefficient of composite PCMs under different heat release times or material temperatures.

Key words: solar energy drying, phase change energy storage material, paraffin wax, iron foam, heat release time

中图分类号:

TK 02

万倩, 何露茜, 何正斌, 伊松林. 泡沫铁/石蜡复合相变储能材料放热过程及其热量传递规律[J]. 储能科学与技术, 2020, 9(4): 1098-1104.

WAN Qian, HE Luxi, HE Zhengbin, YI Songlin. Exothermic process and heat transfer of iron foam/paraffin composite phase change energy storage materials[J]. Energy Storage Science and Technology, 2020, 9(4): 1098-1104.

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材料种类	厚度/mm	t_1fj-10/min	t_2fj-10/min	Δt_fj-10/min	T_1fj-10/℃	T_2fj-10/℃
泡沫铁	10	1	55	54	60.0	43.0
纯石蜡	10	1	80	79	60.0	43.0

材料种类	厚度/mm	t_1fj-15/min	t_2fj-15/min	Δt_fj-15/min	T_1fj-15/℃	T_2fj-15/℃
泡沫铁	15	0	78	78	59.0	43.0
纯石蜡	15	0	102	102	59.0	43.0

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