Preferred Language
Articles
/
alkej-265
Experimental Study on the Effect of Insertion of Copper Lessing Rings in Phase Change Material (PCM) on the Performance of Thermal Energy Storage Unit
...Show More Authors

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.

View Publication Preview PDF
Quick Preview PDF
Publication Date
Sun Jul 03 2005
Journal Name
Political Sciences Journal
البنية الاقتصادية الاجتماعية للادارة الجديدة في الولايات المتحدة الامريكية
...Show More Authors

البنية الاقتصادية الاجتماعية للادارة الجديدة في الولايات المتحدة الامريكية

View Publication Preview PDF
Crossref
Publication Date
Sun Jul 07 2013
Journal Name
Journal Of Educational And Psychological Researches
العولمة الثقافية في القيم التربوية لطالبات قسم رياض الاطفال
...Show More Authors

Seemed reflections of cultural globalization are clear on the values of communities those values that preserve each community privacy, so that became members of these communities lack the ability to distinguish clearly between what is right and what is wrong and adoption of ideas and values imported from abroad, regardless of whether positive or negative. The aim of the research was to: - 1 - Detection of cultural globalization in the educational values for students kindergarten section. 2 - To identify the most prominent educational values (social, scientific, aesthetic, moral and spiritual) globalized culture. The current Aqtsralbges on: - Department of kindergarten students to study in the morning College for Girls, Baghdad University

... Show More
View Publication Preview PDF
Publication Date
Mon Jan 01 2018
Journal Name
مجلة دراسات محاسبية ومالية
إدارة المخاطر في الوحدات الإقتصادية الصناعية بإستعمال مخطط باريتو
...Show More Authors

إدارة المخاطر في الوحدات الإقتصادية الصناعية بإستعمال مخطط باريتو

Preview PDF
Publication Date
Wed Mar 15 2023
Journal Name
مجلة بحوث الشرق الاوسط
جدلية العلاقة بين السلطة والعنف في الفكر السياسي الاسلامي
...Show More Authors

View Publication
Publication Date
Wed Feb 01 2006
Journal Name
Political Sciences Journal
ملامح من فكرة القانون الطبيعي في حضارة العراق القديم
...Show More Authors

ملامح من فكرة القانون الطبيعي في حضارة العراق القديم

View Publication Preview PDF
Crossref
Publication Date
Wed Jan 01 2014
Journal Name
Journal Of The College Of Languages (jcl)
La Visión Filosófica en las Célebres Obras Literarias y Dramáticas de Unamuno
...Show More Authors

Desde la Salamanca de doradas piedras que tantas veces cantara, don Miguel de Unamuno dio a la literatura y al pensamiento españoles unas obras que, a pesar de muchos pesares, perdura viva, como viva fue su agónica existencia.  

   El bilbaíno Miguel de Unamuno (1864-1936) es autor de al menos, doce obras teatrales. Su costumbre de mezclar géneros literarios, sin distinguir claramente el drama de la novela dialogada, le llevó a preferir el teatro leído. De ahí que sus estrenos fuesen, frecuentemente, muy posteriores a las ediciones impresas.

Abstract:

   The Bilbao Miguel de Unamuno (1864-1936) is the author of at least twelve plays. His habit of mixing genres,

... Show More
View Publication Preview PDF
Publication Date
Mon Nov 12 2018
Journal Name
Arab Science Heritage Journal
البرجوازية البرجوازية المسلمة في الشرق الادنى خلال العصر العباسي
...Show More Authors

The shortcomings of the Muslim regime were however, became more obvious in later periods. Under the first Abbasids, the Muslims bourgeoisies were still a new class, rising in the social hierarchy of the caliph empire. It became even powerful class and a factor to reckon with

View Publication Preview PDF
Publication Date
Sun Jan 05 2014
Journal Name
Journal Of Educational And Psychological Researches
دور المؤسسات التربوية في ترسيخ قيم النزاهة لدى الناشئة
...Show More Authors


   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

... Show More
View Publication Preview PDF
Publication Date
Sun Jul 03 2005
Journal Name
Political Sciences Journal
تحديات العولمة للهوية العربية ودور الجامعات العربية في مواجهتها
...Show More Authors

تحديات العولمة للهوية العربية و دور الجامعات العربية في مواجهتها

View Publication Preview PDF
Crossref
Publication Date
Sun Jul 07 2013
Journal Name
Journal Of Educational And Psychological Researches
دور الاسرة العراقية في غرس المنظومة القيمية لدى ابنائها
...Show More Authors

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

... Show More
View Publication Preview PDF