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Fast thermal cycling of acetanilide and magnesium chloride hexahydrate for indoor solar cooking

机译：乙酰苯胺和六水合氯化镁的快速热循环，用于室内太阳能烹饪

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摘要

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 C_8H_9NO (T_m = 116℃) and magnesium chloride hexahydrate MgCl_2-6H_2O (T_m = 116.7℃) 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, MgGl_2·6H_2O 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 MgCl_2·6H_2O is not compatible with either aluminum or stainless steel.
机译：太阳能炊具大致分为直接式或聚焦式，间接式或盒式和高级太阳能炊具。聚焦和箱式太阳能灶具适用于户外应用。先进的太阳能炊具的优点是可在室内使用，从而解决了其中一个问题，该问题阻碍了太阳能炊具的社会接受度。先进的太阳能炊具采用了额外的太阳能装置，这增加了成本。因此，太阳能炊具必须包含储热介质以存储热能，以备日晒时使用。本研究的主要目的是研究商品级乙酰胺C_8H_9NO（T_m = 116℃）和六水合氯化镁六水合物MgCl_2-6H_2O（T_m = 116.7℃）的熔融/凝固快速循环对其热物理性质的影响；例如熔点和熔化潜热，可用作太阳能炊具的存储介质。已经执行了500个循环。使用差示扫描量热技术测量热物理性质。还通过使用SIM技术通过表面调查对循环过程中嵌入PCM中的铝和不锈钢样品进行了研究，以研究所选相变材料（PCM）与包含材料的相容性。可以推断出，对乙酰苯胺是一种有前途的PCM，可用于室内烹饪以及在法律强度的太阳辐射期间，与铝作为一种包含材料具有良好的相容性。然而，由于相分离问题，MgGl_2·6H_2O在热循环过程中（即使采用额外的水原理）也不稳定。因此，不建议将其作为太阳能炊具内部的用于室内烹饪的存储材料。还表明MgCl_2·6H_2O与铝或不锈钢均不兼容。

著录项

  • 来源
    《Energy Conversion & Management》 |2009年第12期|3104-3111|共8页
  • 作者

    A.A. El-Sebaii; S. Al-Amir; F.M. Al-Marzouki; Adel S. Faidah; A.A. Al-Ghamdi; S. Al-Heniti;

  • 作者单位

    Physics Department, Faculty of Science, King Abdul Aziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia Department of Physics, Faculty of Science, Tanta University, Tanta, Egypt;

    Physics Department, Faculty of Science, King Abdul Aziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia;

    Physics Department, Faculty of Science, King Abdul Aziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia;

    Physics Department, Faculty of Science, King Abdul Aziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia;

    Physics Department, Faculty of Science, King Abdul Aziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia;

    Physics Department, Faculty of Science, King Abdul Aziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    phase change materials; thermal cycling; compatibility; salt hydrates; acetanilide;

    机译：相变材料;热循环;兼容性;盐水合物;乙酰苯胺;

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