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Theoretical Prediction of Optimum Chilled Water Distribution Configuration in Air Conditioning Terminal Unit
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 The distribution of chilled water flow rate in terminal unit is a major factor used to evaluate the performance of central air conditioning unit. In this work, a theoretical chilled water distribution in the terminal units has been studied to predict the optimum heat performance of terminal unit. The central Air-conditioning unit model consists of cooling/ heating coil (three units), chilled water source (chiller), three-way and two-way valve with bypass, piping network, and pump. The term of optimization in terminal unit ingredient has two categories, the first is the uniform of the water flow rate representing in statically permanents standard deviation (minimum value) and the second category is the maximum heat transfer rate from all terminal units. The hydraulic and energy equations governing the performance of unit solved with the aid of FORTRAN code with considering the following parameters: total water flow rate, chilled water supply temperature, and variable valve opening. It was found that the optimum solution of three-way valve case at 8°C water supply temperature, 0.12 kg/s total water flow rate and valve opening order (valve 1: 100%, valve 2: 100% and valve 3: 75%) with total heat rate (987.92 Watt) and standard deviation (1.181E-3). Also, for the two-way valve case the results showed that the optimum condition at 8°C water supply temperature, 0.12 kg/s total water flow rate and valve opening order (valve 1: 75%, valve 2: 75% and valve 3: 50%) with total heat rate and standard deviation (717Watt) and (5.69E-4) respectively.

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Publication Date
Sat Dec 01 2007
Journal Name
Journal Of Economics And Administrative Sciences
سلوك السائح ودوره في تحديد النمط السياحي
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المقدمة

تعد السياحة احد مستلزمات الحضارة الحديثة لما تفرزه من آثار ايجابية ودور متميز في دعم الاقتصاد الوطني وتقليل نسبة البطالة وتنشيط الحركة التجارية بين البلدان، اذ لا يمكن ان نتصور وجود بلد متحضر بلا فنادق ولا سياحة وتقديم مختلف السلع والخدمات سياحية التي يمكن ان تسبع الحاجات والرغبات واذواق السياح من خلال  وجود منشآت سياحية تعكس النمط السياحي القائم على اختلاف انواعه

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Publication Date
Wed May 05 2021
Journal Name
Arab Science Heritage Journal
الشك المعرفي في الاسلام واثره على الغرب
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Epistemological skepticism was present strongly in the Islamic
philosophical heritage. Many texts were received by thinkers and
philosophers calling for

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Publication Date
Mon Jan 07 2019
Journal Name
Arab Science Heritage Journal
سياسة سياسة الخلفاء العباسيين في المجال الزراعي
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       سار العباسيون على نفس النهج الذي كان عليه الأمويين في كثير من الانظمه والتقاليد والسياسات على الرغم من إن الدولة العباسية كانت تمثل بداية لعصر جديد في تاريخ الإسلام(1)،ومن تلك الأنظمة التي ورثوها عن الأمويين  وطوروها هي اهتمامهم بالنظام الزراعي منذ بداية قيام دولتهم وهنا سنحاول تقديم بعض الانجازات

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Publication Date
Sun Oct 04 2009
Journal Name
Journal Of Educational And Psychological Researches
استحصال الخبرات اللغوية للأطفال في مرحلة الرياض
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تنبع أهمية البحث من أهمية الخبرات اللغوية التي يكتسبها الأطفال في مرحلة الرياض لما لها من أهمية بالغة في تطوير النمو اللغوي لطفل الرياض وزيادة ذخيرته اللغوية في المرحلة المستقبلية القادمة.

أن ما يكتسبه الطفل في مرحلة الرياض من ألفاظٍ وكلمات تساعد على تنمية محصوله اللغوي وتمكنهُ من النطق اللغوي السليم وتطوير قابليتهِ على تكوين الجُمل والعبارات السليمة التي تُمهد لدخولهِ المرحلة الابتدائ

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Publication Date
Sun Dec 23 2018
Journal Name
Arab Science Heritage Journal
جغرافية جغرافية المدن في كتب التراث الجغرافي
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The Heritage geographical Arab-Muslim of great value in the history of the evolution of thought geographical The themes of cities, like other subjects heritage books geographical Islamic related to geography descriptive and regional were subject to the style of Arabic writing,

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Publication Date
Tue Dec 31 2019
Journal Name
Arab Science Heritage Journal
القنوات القنوات المحفورة في الصخر لجر المياه
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Archaeological waste in the field of irrigation and watering methods, with its agricultural experience and skills, is one of the most significant achievements of the ancients, and perhaps our study area, the province of Aurès, which is located east of Algeria, bears witness to these achievements in the light of geological, geographic and topographic data. Although the inhabitants of this territory have used many techniques for the various civilizations

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Publication Date
Wed Mar 30 2016
Journal Name
College Of Islamic Sciences
Modern mother planting and its impact on marital happiness
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Islam was keen to get every man and woman a share of those benefits and wanted to marry and urged him. In order to unite efforts and articulates the arrow and clarifies the goal and I have a share in building a sober Islamic society, for all this and other research title is ((modern or planting and its impact on marital happiness)).

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Publication Date
Tue Jun 18 2019
Journal Name
Journal Of Accounting And Financial Studies ( Jafs )
Performance Measurement and Evaluated on The Lean Accounting
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At the last two decades , The environment has witnessed tremendous changes in many fields with the huge competition , various technological development and customer satisfaction , that are reflected in economic units a doption for lean production system.   

   Lean accounting that has appeared as a response for change occurred of economic units adoption for changes occurred of economic units adoption for lean production instead of wide production system , has devised new performance measures suitable for economic units adoption for lean ideas: and helping in providing suitable information about evaluating economic unit performance , these measures are divided into three levels , cell level,value flow level , a

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Publication Date
Mon Jan 01 2024
Journal Name
مجلة جامعة الامام الصادق
النطاق القانوني لاكتساب الحيازة المؤهلة في المصارف
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Publication Date
Wed Nov 14 2018
Journal Name
Arab Science Heritage Journal
المنافع المنافع الحيوانية الواردة في القرآن الكريم
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Quran is a basic reference of production it is as a source to all sciences, Ayat of Quran would mention the importance of benefits of animals.  Quran contain full surrat named in animal names as Al-Baqara that is to clarify its benefits and importance in human’s life.

 

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