کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7045487 1457092 2018 30 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Investigation of PCM charging for the energy saving of domestic hot water system
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Investigation of PCM charging for the energy saving of domestic hot water system
چکیده انگلیسی
In this paper an investigation on the charging process of a phase change material (PCM) integrated in a domestic hot water system is presented. In order to increase the amount of the stored energy in a limited portion of time during maximum solar radiation it is preferred to reduce the melting time of the PCM used in the heat exchanger. Therefore the effect of mass distribution of a PCM in a multi-tube heat exchanger is studied. Paraffin RT50, is used as the PCM and water as the heat transfer fluid (HTF) carries the energy gained in solar flat plate collector. Enthalpy porosity method is applied for modeling the phase change process and an experimental result is used to validate the model. There are six different cases in order to examine the effect of mass distribution on the melting time to reach the minimum value. Temperature and heat flux versus time as well as liquid fraction contours and behavior of the charging process are described. The results show that by distributing the PCM mass in a specific arrangement in which 40% of PCM mass is in inner tube, 52% reduction in melting time is achieved hence solar energy can be used more efficiently in the time of maximum solar radiation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Thermal Engineering - Volume 137, 5 June 2018, Pages 659-668
نویسندگان
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