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.
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
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An automatic text summarization system mimics how humans summarize by picking the most significant sentences in a source text. However, the complexities of the Arabic language have become challenging to obtain information quickly and effectively. The main disadvantage of the traditional approaches is that they are strictly constrained (especially for the Arabic language) by the accuracy of sentence feature functions, weighting schemes, and similarity calculations. On the other hand, the meta-heuristic search approaches have a feature tha
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All the economic units whether productive or service units , strive to achieve specific objectives , their presence and continuity depend on them and the quality of the performance and service present to the society . This units to be able to achieve their objectives , must own basic assets to perform the activities , and apply laws , systems , and instructions , in addition to legal , managerial , and financial authorities . So this units to endeavor maintain this assets , in addition to sound application of laws ,systems . and procedures to enhance their performance . For this purpose arise the role of internal control and internal check in maintenance of assets and sound application of&n
... Show MoreOf good reasoning (the art of unique moral turn him poets of Andalusia in
poetry verse emitter myself, and to achieve a very technical. Either the emitter is
related to the nature of the environment and the composition of personal Andalusia
of appetite for life and interaction with the legibility beautiful, and it was (wit)
feature in them even said they are charming as Bagdad ions , and either art, it made
them this color to show their ability intellectual in the search for bugs, and
stimulate their imaginations in a contract equations in the interpretation and find
justifications for the ideas and meanings Exaggeratedly times, and especially in the
purpose of praise, and novelty in many cases, as in the spinning
This study tested the impact of region and gender on adolescents 'stress perceptions and coping styles. A total sample of 650 adolescents (5 9.4% female) from 2 countries (Iraq - Algeria). Samples of n = 325 were drawn from each country completed questionnaires on stress and coping behaviors in four domains (school, parents, peer, and future). Results revealed that levels of perceived stressfulness of issues in different domains were universally similar among adolescents from the two countries. School-related stress received the highest rankings, Parent- , future-, peer-related stress, ranked (second, third, and fourth) respectively. Differences emerged with respect to coping style depending on region and gender. Coping sty
... Show MoreThe Holy Koran is the highest text in the eloquence, It is one of the
important sources of the linguistic syntactic and eloquent study; it impacts
upon these sciences Avery intense impact through advancing its verses as an
argument in the confirmation of the significance of the term
The holy Koran was and still the fountain of the linguistic studies, as
they tend towards it since the second century of the hegira. So this research is
a study of the expressive terms concerning the rain in the holly Koran, a
linguistic study; it aims to study the term concerning its linguistic and
conjugate significance and its expression concerning the rain through reality
and metaphor.
Since Internet Protocol version 6 is a new technology, insecure network configurations are inevitable. The researchers contributed a lot to spreading knowledge about IPv6 vulnerabilities and how to address them over the past two decades. In this study, a systematic literature review is conducted to analyze research progress in IPv6 security field following the Preferred Reporting Items for the Systematics Review and Meta-Analysis (PRISMA) method. A total of 427 studies have been reviewed from two databases, IEEE and Scopus. To fulfil the review goal, several key data elements were extracted from each study and two kinds of analysis were administered: descriptive analysis and literature classification. The results show positive signs of t
... Show MoreMan is distinguished by his ability to harmonize with himself and with his environment, so he always needs the process of sensation to know what is happening around him, and at the same time he needs perception to know and understand what is happening in his surroundings through sensation, that any realization of the perception of forms in the internal spaces can only take place The mental images that are stored and that differ between individuals according to culture and environment, they differ in the ability to see the depths of space through interior design, and the theory of form (gestalt) is one of the most important theories that extended its interpretations to the field of interior design art as the field in which it can be manifest
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