Fast thermal cycling of acetanilide and magnesium chloride hexahydrate for indoor solar cooking
Fast thermal cycling of acetanilide and magnesium chloride hexahydrate for indoor solar cooking
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DOI：
10.1016/j.enconman.2009.08.020
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发表时间：
2009-12-01
影响因子：
10.4
通讯作者：
Al-Heniti, S.
中科院分区：
文献类型：
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作者：
El-Sebaii, A. A.;Al-Amir, S.;Al-Heniti, S.
太阳能炊具大致分为直接或聚焦型，间接或箱式和高级太阳能炊具。聚焦式和箱式太阳灶适用于户外应用。先进的太阳能炊具具有可在室内使用的优点，从而解决了阻碍社会接受太阳能炊具的问题之一。先进的太阳能炊具采用额外的太阳能装置，增加了成本。因此，太阳灶必须含有储热介质，以储存热能供非日照时间使用。本研究的主要目的是研究商业级乙酰苯胺C8 H9 NO（T-m = 116 ℃）和氯化镁六水合物MgCl 2中心点6 H（2）O（T-m = 116.7 ℃）的熔融/固化快速循环对其热物理性质的影响;例如熔点和熔化潜热，用作太阳能炊具内的存储介质。已经进行了500次循环。采用差示扫描量热法测定了其热物理性能。所选择的相变材料（PCM）与包含的材料的兼容性也研究了通过表面调查，使用SIM技术，铝和不锈钢样品嵌入在PCM在循环过程中。乙酰苯胺与铝的相容性良好，是一种很有前途的相变材料，可用于室内和低强度太阳辐射期间的烹饪。然而，由于相分离问题，MgCl 2中心点6 H（2）O在其热循环过程中（即使有额外的水原理）也不稳定：因此，不建议将其作为太阳能炊具内的存储材料用于室内烹饪。MgCl_2中心点6 H（2）O与铝或不锈钢均不相容。(C)2009爱思唯尔有限公司保留所有权利。
Solar cookers are broadly divided into a direct or focusing type, indirect or box-type and advanced solar cookers. The focusing and box-type solar cookers are for outdoor applications. The advanced solar cookers have the advantage of being usable indoors and thus solve one of the problems, which impede the social acceptance of solar cookers. The advanced type solar cookers are employing additional solar units that increase the cost. Therefore, the solar cooker must contain a heat storage medium to store thermal energy for use during off-sunshine hours. The main aim of this study is to investigate the influence of the melting/solidification fast cycling of the commercial grade acetanilide C8H9NO (T-m = 116 degrees C) and magnesium chloride hexahydrate MgCl2 center dot 6H(2)O (T-m = 116.7 degrees C) on their thermo-physical properties; such as melting point and latent heat of fusion, to be used as storage media inside solar cookers. Five hundred cycles have been performed. The thermo-physical properties are measured using the differential scanning calorimetric technique. The compatibility of the selected phase change materials (PCMs) with the containing material is also studied via the surface investigation, using the SIM technique, of aluminum and stainless steel samples embedded in the PCM during cycling. It is inferred that acetanilide is a promising PCM for cooking indoors and during law intensity solar radiation periods with good compatibility with aluminum as a containing material. However, MgCl2 center dot 6H(2)O is not stable during its thermal cycling (even with the extra water principle) due to the phase segregation problem: therefore, it is not recommended as a storage material inside solar cookers for cooking indoors. It is also indicated that MgCl2 center dot 6H(2)O is not compatible with either aluminum or stainless steel. (C) 2009 Elsevier Ltd. All rights reserved.