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.
جاء التقويم ليكون مكملا للعمليات التعليمية يساعد على الوقوف على نتائجها وسبل النهوض بها والوقوف على المعوقات التي تقف امام مسيرتها وقد عنيت عمليات التقويم باهتمام كبير من قبل القائمين على العمليات التعليمية اذ عقدت العديد من المؤتمرات والندوات واجريت العديد من الدراسات عالميا ومحليا من اجل الوقوف على هذه العملية المهمة الداعمة للتعليم والنهوض بمستويات المتعلمين ، ومن بي
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Here is a professional and precise English translation of the text, formatted for clarity and academic/report standards: ## Translation Sustainable management of irrigation water is one of the most critical challenges facing the agricultural sector in Iraq, including the Al-Mahmoudiya district. As a vital rural and agricultural area, Al-Mahmoudiya relies on agriculture as a primary source of livelihood, particularly for cultivating grains, vegetables, and certain horticultural crops. Farmers in the district mainly depend on the Tigris and Euphrates rivers and their branching canals, as well as groundwater in certain areas. However, the prevailing irrigation methods remain traditional, leading to significant water waste and low water-use e
... Show MoreObjectives: To assess patients' satisfaction to nursing care at hemodialysis units and determine the relationship
between patients' satisfaction and patients' demographic data.
Methodology: A descriptive study was carried out at hemodialysis units of Baghdad teaching hospitals from Feb.
4
th
, 2010 through Sep. 5
th, 2010. A purposive (non-probability) sample of (150) patients ta hemodialysis units ni
Baghdad teaching hospitals was selected. The data were collected through the use of constructing questionnaire
and by means of an interview technique with the patients; the questionnaire consists of two parts (1)
demographic data (2) patients' satisfaction to nursing care. The validity of the study questionnaire w
المقدمة Introduction شهد العالم في العقود الأخيرة تطورًا مذهلًا في تقنيات الثورة الرقمية، وفي مقدمتها الذكاء الاصطناعي، الذي يُعد اليوم أحد أكثر مظاهر الكيانات الرقمية تقدمًا وإثارة للجدل. فقد تجاوز الذكاء الاصطناعي كونه أداة برمجية تُستخدم لإتمام مهام بسيطة، وأضحى فاعلًا رقميًا له تأثير حاسم في مجالات متعددة، كالصحة، والصناعة، والتعليم، والعدالة، والأمن، والعلاقات الاجتماعية، وغيرها. وقد بات من المألوف الحد
... Show Moreمارس العراقيون القدماء في حضارة ما بين النهرين الوانا من الانشطة الرياضية والتدريبات البدنية لتطوير لياقتهم البدنية حتى اصبحت تلك الممارسات جزءا من حياتهم ورافقت احتفالاتهم الدينية والاجتماعية والعسكرية، وكان للموسيقى حضور في العديد من المشاهد الرياضية كما كان استحضار العازفين والاتهم الموسيقية مع الجيوش دلالة على دورها الكبير في المشهد العسكري، لذا جاء هدفا البحث في تسليط الضوء على الادلة والشواهد الاث
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المستخلص يتضمن البحث شرح موجز لمفهوم نظم المعلومات الجغرافية وعلاقتها مع علم الاثار والتاكيد على اهميتها في هذا المجال وكيفية الاستفادة من هذه النظم في مجال التنقيب عن الاثار مع الاستعانة بالعمل الحقلي المنجز في موقع تنقيبات جامعة الموصل عند تل قوينجق لتوضيح كيفية الاستفادة من مجموعة من مصادر وبرامج نظم المعلومات الجغرافية لسد بعض متطلبات عملية التنقيب عند تل قوينجق في مدينة نينوى الاثرية لعام 2011.
This study aims to identify the degree of Arabic language teachers at the secondary stage possessing the teaching competencies necessary to develop the skills of literary savor among their students from the perception of educational leaders in Bisha Province. To achieve the objectives of the study, the descriptive approach was used by adopting a comprehensive survey method. The study sample consisted of (48) school principals and Arabic language supervisors in Bisha Province who supervise the teaching of Arabic language at the secondary level in Bisha Province. The necessary data was collected using a questionnaire. The results of the study revealed that the evaluation of the study sample for the degree to which Arabic language teachers
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In this research, estimated the reliability of water system network in Baghdad was done. to assess its performance during a specific period. a fault tree through static and dynamic gates was belt and these gates represent logical relationships between the main events in the network and analyzed using dynamic Bayesian networks . As it has been applied Dynamic Bayesian networks estimate reliability by translating dynamic fault tree to Dynamic Bayesian networks and reliability of the system appreciated. As was the potential for the expense of each phase of the network for each gate . Because there are two parts to the Dynamic Bayesian networks and two part of gate (AND), which includes the three basic units of the
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This research investigates modern linguistics in terms of the “universality” concept, through which linguistics shifted its attention from the description of the phenomenon into finding an interpretation of it. Then it investigates what needs interpretation in the language