کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
6534501 1420648 2018 11 صفحه PDF سفارش دهید دانلود رایگان
عنوان انگلیسی مقاله ISI
Preparation and characterization of an inorganic magnesium chloride/nitrate/graphite composite for low temperature energy storage
ترجمه فارسی عنوان
تهیه و تعیین ترکیبات منیزیوم کلرید / نیترات / گرافیت معدنی برای ذخیره انرژی کم دما
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کلمات کلیدی
ماده تغییر فاز غیر معدنی، گرافیت گسترش یافته، افزایش انتقال حرارت، مواد کامپوزیت،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
چکیده انگلیسی
In this study, an inorganic mixture of 40 wt% MgCl2·6H2O and 60 wt% Mg(NO3)2·6H2O was impregnated into two types of the expanded graphite (EG): EG flakes and EG matrix. Different methods of preparation usually used in the organic composite preparation, such as direct blending, vacuum impregnation, ultrasonic impregnation and immersion were applied in this work. Considering the samples with EG matrix, it can be concluded that the optimal result of the encapsulation and ΔH ratio can be reached with the experimental time of 1, 3 and 4 h using the vacuum, ultrasound and immersion methods, respectively. Moreover, the percentage of encapsulation increases with the experimental time and with the EG percentage for the EG matrix and for the EG flakes, respectively. Concerning the supercooling phenomena, the results show that the presence of EG reduces the difference between fusion and crystallization temperature for up to 65%, acting as а nucleating agent. The resulting composite samples (CPCM) were proved to have good latent heat and a significant reduction of the supercooling effect, which eliminates the need to use nucleating agents, that are essential for pure PCM of 40 wt% MgCl2·6H2O and 60 wt% Mg(NO3)2·6H2O. Moreover, using EG suppresses significantly the melting time which indicates the heat transfer enhance of the mixture. This circumstance could allow to empower the utilization of the mentioned mixture in different fields of thermal energy storage at low temperature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solar Energy Materials and Solar Cells - Volume 175, February 2018, Pages 60-70
نویسندگان
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