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Energy and Exergy Analysis on Modified Closed Wet Cooling Tower in Iraq

The present study involves experimental analysis of the modified Closed Wet Cooling Tower (CWCT) based on first and second law of thermodynamics, to gain a deeper knowledge in this important field of engineering in Iraq. For this purpose, a prototype of CWCT optimized by added packing under a heat exchanger was designed, manufactured and tested for cooling capacity of 9 kW. Experiments are conducted to explore the effects of various operational and conformational parameters on the towers thermal performance. In the test section, spray water temperature and both dry bulb temperature and relative humidity of air measured at intermediate points of the heat exchanger and packing. Exergy of water and air were calculated by applying the exergy destruction method on the cooling tower. Experimental results showed a significant performance improvement when using packing on the CWCT. It can be observed that the thermal efficiency for the CWCT with packing under a heat exchanger and CWCT with packing above the heat exchanger are approximately 40% and 25% higher than that of the CWCT without packing respectively. As another part of the experiment results, it is indicated that the exergy destruction is directly proportional to air flow rate, cooling water flow rate, inlet cooling water flow rate and inlet Air Wet Bulb Temperature (AWBT) whereas, it is inversely proportional with spray water flow rate. In comparison with the cooling capacity of the tower, it was found that the exergy destruction approximately less than 20%. Exergy efficiency behavior is inversely proportional with the behavior of the exergy destruction. Empirical correlations are obtained to predict water film heat transfer coefficient and air-water mass transfer coefficient considering the influences of operational parameters.

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Publication Date
Fri Sep 30 2022
Journal Name
Journal Of Economics And Administrative Sciences
A Comparative Study for Estimate Fractional Parameter of ARFIMA Model

      Long memory analysis is one of the most active areas in econometrics and time series where various methods have been introduced to identify and estimate the long memory parameter in partially integrated time series. One of the most common models used to represent time series that have a long memory is the ARFIMA (Auto Regressive Fractional Integration Moving Average Model) which diffs are a fractional number called the fractional parameter. To analyze and determine the ARFIMA model, the fractal parameter must be estimated. There are many methods for fractional parameter estimation. In this research, the estimation methods were divided into indirect methods, where the Hurst parameter is estimated fir

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Publication Date
Wed May 18 2016
Journal Name
Al-academy
Aesthetic dimension to the formation of postmodern: إيهاب احمد عبد الرضا

Find taught dimension aesthetic in the formation of post-modernism, which is one of the themes of aesthetics in the stream of postmodernism, is problematic because of the lack of provisions and fixed values reinforce the concept of beauty, and put done technical plastic in the circle of evaluation and judgment aesthetic, this research as an attempt to reveal the aesthetic concepts that can be drawn from artistic experiments in the formation of post-modernism, through the development of those concepts viable mainstream.
Search contains four chapters: the first chapter includes a general approach to the research, has been showcasing the research problem and the importance of research and goal of Search: detection dimension aesthetic in

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Publication Date
Sun Jan 13 2019
Journal Name
Arab Science Heritage Journal
سياسة النبي محمد (ص) الحكيمة في معالجة أحداث غزوة بني المصطلق

 تعد دراسة التراث العلمي العربي من الدراسات التي تلقي الضوء على التطور التاريخي للعلوم العربية وما أنجزته العقلية العربية في هذا الميدان للمدة التاريخية التي ابتدأت بعصر صدر الإسلام وانتهت بالخلافة ويرى الكثير من العلماء سواء كان

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Publication Date
Wed Mar 22 2023
Journal Name
مجلة الجامعة العراقي ة
اتجاهات معاصرة في ط ا رئق التدريس التعلم النشط أنموذج ا

يعد التعلم النشطعملية نشطة ذهنية يبذٌل بها العقل الجهد الكافي لإِكتشاف المعرفة فالمعلمليس ناقلاً فيه للمعرفة ،) وانما مرشداً وموجهاً والمتعلم محور العملية التدريسية فيه،إِي عمليةإِبداع يختار منها المعلمما يستطيع الابداع فيه وتركيبه)حارص، 2015:6 والتعلم النشط طريقة تعاونية يشترك فيها جميع المتعلمين بالأنشطة والواجبات المتنوعة التي تسمح لهم بالأصغاء الإِيجابي والتحليل السليم للمادة والتفكي ا رلابداعي اذ تت

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Publication Date
Sun Jan 01 2023
Journal Name
كتاب المؤتمر العلمي الانساني الثاني لكلية الحكمة الجامعة
اهمية شبكة المعلومات الدولية لتدريسيي مادة اللغة العربية في جامعة بغداد

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Publication Date
Mon Feb 01 2010
Journal Name
(مجلة الأستاذ )،الصادرة عن (كلية التربية ابن رشد /جامعة بغداد)
علم المعاني في كتاب ( البلاغة والتطبيق ) للدكتور أحمد مطلوب ( تنبيهات وإضاءات )

تنظر المجلة

Publication Date
Tue Jan 01 2008
Journal Name
Journal Of Educational And Psychological Researches
البواعث النفسية في رسم لوحة التشبيه - عند شعراء ما قبل الإسلام -

        مما توصل إليه البحث  :

            إن الدوافع النفسية تنفرد في تجسيد الأحاسيس والمشاعر في نتاج الشاعر , من خلال رؤيته لتلك الحالة , فتسهم في صورة المقارنة في التشبيه , فتبعث في المتلقي حالة التأمل والمقارنة بين الحالتين اللتين تجمع بين مكوناتهما صفة واحدة فتصل إلى حالة التلاحم , ويكون ذلك باعثا لرسم صورة التشبيه ال

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Publication Date
Wed Jul 01 2015
Journal Name
Journal Of Educational And Psychological Researches
مدخل في سيكولوجيــة طب الاسنــان علم نفس طب الاسنــان (Psychology Dentistry )

When we study the history of dentistry we can investigate some methodology styles which  lead us to psychology – dentistry or take the relationship between psychology and dentistry, and this type of specialization  which is Medical psychology has its own methodology and subjects, as the historical sequence in this filed lead to how evolution occurred in this branch of medicine, which was accompanied by many factors , and this factor that contributed to the consolidation of the misconceptions about the social, family and the media culture and gave a distorted picture of Dentistry and the attending physician or dentist  and show  him as someone tough , ruthless and violent in his dealings and style , these pro

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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 Jun 16 2019
Journal Name
Al–bahith Al–a'alami
Journalistic recruitment for the Infographics news sites Bairaq hussien jumhaa al ruba

The aim of the research is to find out the methods of employing the : Infographics in the news sites due to the different communicative roles of the : Infographics . To achieve the research objective, the researcher used the survey method: the method of analyzing the content to analyze the : Infographics material from the selected sample of the news sites. What was said ? And how was it said? Through the design of a content analysis form that includes a number of studied analysis Infographics of the study.

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