Experimental assessment of heat storage properties and heat transfer characteristics of a phase change material slurry for air conditioning applications
Experimental assessment of heat storage properties and heat transfer characteristics of a phase change material slurry for air conditioning applications
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DOI：
10.1016/j.apenergy.2009.05.002
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发表时间：
2010-02-10
期刊：
影响因子：
11.2
通讯作者：
Oliveira, Armando C.
中科院分区：
文献类型：
--
作者：
Diaconu, Bogdan M.;Varga, Szabolcs;Oliveira, Armando C.
以Rubitherm RT6为微胶囊，在较高浓度(45%w/w)下制备了一种新型微胶囊化相变材料浆料。为了评估其与太阳能空调低温蓄热系统集成的适宜性，对一些蓄热性能和换热特性进行了实验研究。采用差示扫描量热法(DSC)对其冷库容量和相变温度范围进行了评价。相变间隔约为3摄氏度，热滞行为也已确定。建立了一套实验装置，用于定量研究垂直螺旋管在相变材料浆液中的自然对流换热。首先，用水进行了实验，以获得自然对流换热关联式。并与相变材料浆料的计算结果进行了比较。结果表明，在相同的温度条件下，在相变区间内，相变料浆的换热系数大于水的换热系数。(C)2009爱思唯尔有限公司。保留所有权利。
A new microencapsulated phase change material slurry based on microencapsulated Rubitherm RT6 at high concentration (45% w/w) was tested. Some heat storage properties and heat transfer characteristics have been experimentally investigated in order to assess its suitability for the integration into a low temperature heat storage system for solar air conditioning applications. DSC tests were conducted to evaluate the cold storage capacity and phase change temperature range. A phase change interval of approximately 3 degrees C and a hysteresis behaviour of the enthalpy were identified. An experimental set-up was built in order to quantify the natural convection heat transfer occurring from a vertical helically coiled tube immersed in the phase change material slurry. First, tests were carried out using water in order to obtain natural convection heat transfer correlations. Then a comparison was conducted with the results obtained for the phase change material slurry. It was found that the values of the heat transfer coefficient for the phase change material slurry were higher than for water, under identical temperature conditions inside the phase change interval. (C) 2009 Elsevier Ltd. All rights reserved.