Experimental study of natural convection heat transfer in a microencapsulated phase change material slurry
Experimental study of natural convection heat transfer in a microencapsulated phase change material slurry
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DOI：
10.1016/j.energy.2009.06.028
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发表时间：
2010-06
期刊：
影响因子：
9
通讯作者：
B. Diaconu;S. Varga;Armando C. Oliveira
中科院分区：
文献类型：
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作者：
B. Diaconu;S. Varga;Armando C. Oliveira
以Rubitherm RT6为微胶囊剂，研制了一种高浓度（45%w/w）的相变材料微胶囊浆料。它的蓄热和传热特性进行了实验研究，以评估其适合集成到一个低温蓄热系统的太阳能空调应用。差示扫描量热法测试已经进行了评估的蓄冷能力和相变温度范围。建立了一个实验装置，以量化的自然对流换热发生从垂直螺旋盘管浸没在MEPCS。首先，使用水进行测试，以获得自然对流传热的相关性，然后与MEPCS获得的结果进行比较。结果发现，在相变区间内的MEPCS的传热系数的值显着高于水，在相同的温度条件下。
A new microencapsulated PCM (Phase Change Material) slurry (MEPCS) at high concentration (45% w/w) was developed based on microencapsulated Rubitherm RT6. Its heat storage and heat transfer characteristics have been experimentally investigated in order to assess its suitability for integration into a low temperature heat storage system for solar air conditioning applications. Differential scanning calorimetry tests have been conducted to evaluate the cold storage capacity and phase change temperature range. An experimental setup was built in order to quantify the natural convection heat transfer occurring from a vertical helically coiled tube immersed in the MEPCS. First, tests were carried out using water in order to obtain natural convection heat transfer correlations and then a comparison was made with the results obtained for the MEPCS. It was found that inside the phase change interval the values of the heat transfer coefficient for the MEPCS were significantly higher than for water, under identical temperature conditions.