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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 Dec 23 2018
Journal Name
Arab Science Heritage Journal
قراءة قراءة نقدية في موارد كتاب الضوء اللامع للسخاوي (ث 902هـ)
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The book (Al-Thaw’ Al-Lami’) (Bright Light) by AlSakhawi is one of the most important historical sources in the Hijri ninth century. In this book, the author mentioned the biographies of most famous scientists and other authors browsing the most prominent scientific

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Publication Date
Tue Nov 13 2018
Journal Name
Arab Science Heritage Journal
توظيف توظيف التراث في المونودراما المسرحية (نصوص د. علي حداد أنموذجاً)
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Arabic humanity heritage had considered as a treasure of artistic, literary aspects, which is full of energies to embody investment by suitable historical ideology.

Theatre, art can be used, corresponded to make special essay reflecting a desire to establish cultural notification.

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Publication Date
Sat Feb 02 2019
Journal Name
Journal Of The College Of Education For Women
اسلوب القسم الظاهر واثره في بناء النص القراني سورة العاديات ..........انموذجا
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Publication Date
Sun Jan 02 2005
Journal Name
Political Sciences Journal
عرض اطروحة (نهضة الامة العربية والاسلامية في فكر مالك بن نبي)
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نهضة الامة العربية والاسلامية في فكر مالك بن نبي

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Publication Date
Thu Nov 21 2024
Journal Name
مؤتمر
استراتيجية الأمن السيبراني ودورها في تحقيق أهداف التنمية المستدامة: العراق انموذجاً
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Publication Date
Tue Dec 01 2020
Journal Name
Al-khwarizmi Engineering Journal
Applying Trade-off Curve to Support Set-Based Design application at an Aerospace Company
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Companies compete greatly with each other today, so they need to focus on innovation to develop their products and make them competitive. Lean product development is the ideal way to develop product, foster innovation, maximize value, and reduce time. Set-Based Concurrent Engineering (SBCE) is an approved lean product improvement mechanism that builds on the creation of a number of alternative designs at the subsystem level. These designs are simultaneously improved and tested, and the weaker choices are removed gradually until the optimum solution is reached finally. SBCE implementations have been extensively performed in the automotive industry and there are a few case studies in the aerospace industry. This research describe the use o

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Publication Date
Sun Apr 01 2018
Journal Name
Journal Of Educational And Psychological Researches
Educational and psychological adjustment among hostel's students at Omer al-mokhtar University
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Educational and psychological adjustment considered to be one of the effective and serious matters at people dealings and behaviors. Generally, psychological adjustment reflects positively on an individual mental health and their capability to be creative at their field. In contrast to those people who lack this feature. As for educational adjustment, it refers to the compatibility and harmony between an individuals and people around. Thus, these features should be available among students particularly those who stay in students' hostel since they live far from their families. The findings of study revealed that there is Educational and psychological adjustment between male and female. Besides, significant differences were showed

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Publication Date
Sun Jan 01 2017
Journal Name
المجلة القانونية العلمية المحكمة
الدور القانوني للحوافز الضريبية في تحقيق التراكم الراسمالي(العراق ومصر انموذجا)
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Publication Date
Mon Nov 26 2018
Journal Name
Arab Science Heritage Journal
مرويات مرويات الفكر الغيبي في مصر المملوكية ( 648- 923هـ/ 1250- 1517م)
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This research has been devoted to the study narratines of the metaphysical concepts in Egypt during the Mamluk era ( 648-923 AD/1250-1517 AH). The study consists of three sections and an  introductionwhich highlights the study at that time for its great impaction public life in Egypt.

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Publication Date
Thu Mar 01 2007
Journal Name
Journal Of Economics And Administrative Sciences
مقارنة الأساليب المستخدمة في تحديد عدد المركبات الرئيسية مع التطبيق العملي
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The principal components analysis is used in analyzing many economic and social phenomena; and one of them is related to a large group in our society who are the university instructors. This phenomenon is the delay occurred in getting university instructor to his next scientific title. And as the determination of the principal components number inside the principal components depends on using many methods, we have compared between three of these methods that are: (BARTLETT, SCREE DIAGRAM, JOLLIFFE).

     We concluded that JOLLIFFE method was the best one in analyzing the studying phenomenon data among these three methods, we found the most distinguishing factors effecting on t

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