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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
Thu Nov 01 2018
Journal Name
Arab Science Heritage Journal
الامانة الأمانة في نظريات الترجمة القديمة والحديثة
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Trust is undoubtedly one of the most important issues in the field of translation studies Therefore, the present study attempts to analyze historical and current theories of translation in the East and West, to specify the position of the Trust and its importance to translators and Translation scholars.

More important of this papers is show that the concept of trust is deferens to this translation theory and that, some believe that trust in translation is For the words quoted, Some people say they trust in quotes, and some neglect of both the target text and And the original value of the source text.

Keywords: translation, translatior,  trust, Source text, target text, Seizure

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Publication Date
Wed Oct 31 2018
Journal Name
Arab Science Heritage Journal
الاعلام الاعلام العسكري ودوره في ترسيخ السلام
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ان علاقة وسائل الإعلام بحل الصراعات وبناء السلام المجتمعي كأحد الموضوعات المهمة التي تربط بين مجالي العلاقات الدولية والدراسات الإعلامية. ويعود مصطلح صحافة السلام إلى السبعينيات من القرن العشرين حيث يقدم هذه المفهوم مدخلا جديدا للإعلاميين يمُكنهم من البحث في الأسباب البنائية والثقافية للصراع ومدى تأثيره على حياة المواطنين وتقديم المضمون الذي يعكس القواسم المشتركة بين كافة أطراف الصراع في مجتمع معين وطر

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Publication Date
Sun Dec 02 2007
Journal Name
Political Sciences Journal
دور طلاب النور في الحياة السياسية التركية
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دور طلاب النور في الحياة السياسية التركية

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Publication Date
Mon Nov 26 2018
Journal Name
Arab Science Heritage Journal
دراسات دراسات في أرض الخِراج وأرض العُشر
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the source of Fiqh do not give areal picture for the efforts which have been done for economic system of the taxes But it gives a special ideas about what must be done.

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Publication Date
Thu Jul 29 2021
Journal Name
Arab Science Heritage Journal
اهل الذمة في كتاب زهر الاداب للقيرواني
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Alqairawany ensured that the book “kitab zahr aladab “referred to giving important in sign to the peaceful coexistence with which the people of non-Islamic

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Publication Date
Sun Dec 02 2018
Journal Name
Arab Science Heritage Journal
نظرة نظرة الى فن الفلاحة في الاسلام
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       This research is marked by "a look at the art of farming in Islam" to sign Mehdi Mohaqiq worthy of translation into Arabic because it is known in the arts and sciences of agriculture in the Islamic heritage, which was known and which has been translated into Arabic, has dealt with the following topics:

- The attention of Muslim scholars to study the works of Greece

- The discretion of the caliphs and the judges and the Senate Agriculture ordered

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Publication Date
Tue Dec 01 2015
Journal Name
مجلة العلوم القانونية
التنظيم القانوني للمنافسة التجارية في التشريع العراقي
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المنافسة التجارية في التشريع العراقي

Publication Date
Wed Dec 20 2023
Journal Name
Arab Science Heritage Journal
المعالم الفكرية في بغداد )شارع المتنبي( أنموذج
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The city of Baghdad has witnessed multiple stages in its
growth and development, and this is reflected in its intellectual
space, which responds to urban, economic, social and political
changes, which was reflected in its fabric and land uses. Baghdad
was characterized by the spontaneous weaving and hierarchy of
streets and alleys, s

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Publication Date
Thu Jul 29 2021
Journal Name
Arab Science Heritage Journal
امارة الحج في عهد ابي جعفر المنصور
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When writing about the Emirate of Hajj in the Arab Islamic State, one must stop at the time period of Caliph Al-Mansour

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Publication Date
Mon Apr 29 2019
Journal Name
Arab Science Heritage Journal
كسر كسر أفق التوقع في الشعر الجاهلي
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It is an effect to draw attention to the aesthetic aspects and dedication And sounding the horizon of expectation among the public- the recipients- and knowing his taste

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