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Experimental Study on the Effect of Insertion of Copper Lessing Rings in Phase Change Material (PCM) on the Performance of Thermal Energy Storage Unit
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Abstract

One of the most suitable materials to be used in latent heat thermal energy storage system (LHTES) are Phase change materials, but a problem of slow melting and solidification processes made many researchers focusing on how to improve their thermal properties. This experimental work concerned with the enhancing of thermal conductivity of phase change material. The enhancing method was by the addition of copper Lessing rings in phase change material (paraffin wax). The effect of diameter for the used rings was studied by using two different diameters (0.5 cm and 1cm). Also, three volumetric percentages of rings addition (3%, 6% and 10%) were tested for each diameter. The discharging process was done with four velocities for each case. The obtained results indicated that the maximum volumetric percentage gave a diminished time for melting and maximized the heat transfer in both PCM and air sides as compare with the case of no rings, but the effect of these rings had lower effect on the solidification time. In case of 1 cm rings diameter minimum time for melting was obtained for both 3% and 6% volumetric percentages as compared with the same percentages in case of 0.5 cm diameter rings, while the latter with 10% volumetric percentage overcomes the 1 cm diameter rings for the same previous percentage. Also it can be seen that the minimum velocity (v=1m/s) gave the utmost outlet temperature and with the maximum one (v=3m/s), the minimum solidification time achieved.

Keyword: Thermal energy storage systems, Latent heat storage, Phase change materials, Heat transfer enhancement.

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Publication Date
Sun Jan 05 2014
Journal Name
Journal Of Educational And Psychological Researches
دور المؤسسات التربوية في ترسيخ قيم النزاهة لدى الناشئة
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   The research aims to identify the role of educational institutions in instilling the values ​​of integrity among emerging in word and deed and identifies research in educational institutions that have a significant impact in the emerging figures such as (family , school , media , mosque , civil society organizations , youth clubs .Have been identified the most important search terms of ( values ​​,educational institutions , Integrity) also touched search particular concern values ​​education and its impact on emergent behavior , then separate search in the role of each educational institution to establish moral values ​​in general and the values ​​of integrity, particularly in the behavior of emerging

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Publication Date
Sun Jul 03 2005
Journal Name
Political Sciences Journal
تحديات العولمة للهوية العربية ودور الجامعات العربية في مواجهتها
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تحديات العولمة للهوية العربية و دور الجامعات العربية في مواجهتها

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Publication Date
Sun Jul 07 2013
Journal Name
Journal Of Educational And Psychological Researches
دور الاسرة العراقية في غرس المنظومة القيمية لدى ابنائها
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The family is e Social first come into contact with filial friction direct and continuing as is the social environment the first to grow the patterns of socialization that make up the life of the individual in the future , especially in forming the personality of both social and cultural , the family's work to lay the foundations of standards called the system value , which is ( religious teachings - customs - traditions - norms ) and is on its way interaction values ​​between family members as well as the transfer of expertise , knowledge and models of behavioral by parents to their children , which will be in accordance with the type of interactions and social relations is also affected dev

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Publication Date
Wed Nov 28 2018
Journal Name
Arab Science Heritage Journal
الصناعة الصناعة في بغداد للفترة (334هـ /935م -555هـ/ 1160م)
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The industries in Baghdad, the most important economic activities in the era albeit and Seljuk to the availability of manpower and resources which encourage the establishment of these industries in Baghdad.

These industries seam as simple crafts, but they may have influenced the nature of the social and economic life in the Baghdadi community during the foreign authority on Iraq and general in Baghdad in particular.

 

 

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Publication Date
Sun Jun 20 2021
Journal Name
Baghdad Science Journal
Ontological Methodologies for Counselling Intervention: Do’a and Zikr Al-Mā’thur Corpus
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Do’a and Zikr al-Mā’thur (authentic supplications and remembrance of ALLAH ‘Azza wa Jalla) can be suggested to Muslims to help them deal with challenges or issues in life. Counselling cases affect a person’s feelings. Do’a and Zikr al-Mā’thur are often applied as a counselling intervention. Unfortunately, the authentic Do’a and Zikr al-Mā’thur are dispersed in many resources not visible to users, and the fact that not all online resources offer access to accurate Do’a and Zikr al-Mā’thur to users and the dubious Do’a and Zikr al-Mā’thur frequently credited to the Prophet (pbuh). The goal of this research is to develop an ontology

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Publication Date
Sun Jan 03 2010
Journal Name
Journal Of Educational And Psychological Researches
تطوير أداء الجامعة في التقدم العلمي والتكنولوجي والتنمية البشرية
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      ان تحقيق التطوير المطلوب في التعليم الجامعي يستلزم القيام ببحوث علمية تساعد في الوصول الى معادلات سليمة لأحداثه، وتجنب سلبيات التغيير غير المدروس وغير المخطط علميا ، والبحث الحالي هو محاولة في هذا الأتجاه، ويهتم بوضع خطوط عريضة تتضمن مجموعة الآراء والأفكار والتوجهات ذات الاهمية لتطوير دور التعليم العالي في تنمية العلم والتكنولوجيا، والتنمية البشرية ، أيضا في توجيه

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Publication Date
Wed Oct 31 2018
Journal Name
Arab Science Heritage Journal
التراتيب التراتيب الإدارية في تاريخ خليفة بن خياط (240هـ)
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خليفة بن خياط بن خليفة الشيباني ألليثي العصفري البصري، أبو عمرو، ويعرف بشَبَابه، الفقيه، المُحدَث، الأديب، المؤرخ، النسَابة، وهو سليل أسرةِ اشتهر أبناؤها بالعلم، وأنجبت عدداً من العلماء الأفاضل، الذين عرفوا في ميادين مختلفة، فالجد والأب والحفيد، علماء محدَثون، وبرزوا في علوم عدة ، كان متقناً وعالماً بأيام الناس.

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Publication Date
Mon Nov 19 2018
Journal Name
Arab Science Heritage Journal
مفهوم مفهوم التاريخ الطبيعي لحشرة النحل في التراث الإسلامي
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The insects like other creatures in the wide world, and there are more than a million class and type of these objects, some of which human haunted since the old to the present day.

 In this study highlight the insect bee addressing her life and behavior, and the novelty of her and wonders what mystified by the minds of men that her world is full of mysteries and surprises drew the attention of workers in the natural history of the study and scrutiny of methods and different characteristics of scientists as she gives more than it takes. It appeared that the Islamic heritage has singled out these insects with something of interest and precise detail, but that God Almighty made suras from the Koran carrying insect name two Sura

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Publication Date
Sun Jul 03 2005
Journal Name
Political Sciences Journal
المنازعات والحروب الاهلية في العالم الثالث نموذجاً الصومال وافغانستان
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المنازعات والحروب الاهلية في العالم الثالث نموذجاً الصومال وافغانستان

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Publication Date
Mon Oct 22 2018
Journal Name
Arab Science Heritage Journal
تطور تطور التعليم اليهودي في بغداد خلال العهد الملكي
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That the Jewish minority in Iraq, were considered among the Iraqi people, building.

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