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.
The research revolves around the methodology of the historian Ibn Wasil
(d.697 AH) in dealing with the Mongolian invasion through his book
“Mafrej al-Karroub fi Akhbar Bani Ayyub
Analytical Hierarchy Process (AHP) belongs to the family of Multiple Criteria Decision Making (MCDM) and has, recently, received a wide popularity in decision making regarding supplier selection. The objective of this study is to apply the methodology of AHP on selecting suppliers to supply materials for the Geological Survey and Mining Company (GSMC). Criteria for rating the suppliers and pairwise comparisons were identified by the members of the Tenders Analysis Committee (TAC). In order to judge the internal validity of the AHP, it was applied manually on a sample of fourteen tenders that were analyzed and executed between 2004-2007, then an interactive computerized package was developed
... Show MoreThe Costing Accounting is one the analytic tools which plays important role by support the management in planning& control and decisions-making ,as it became attendant necessity to establish any project whether industrial ,commercial ,service or agriculture ..etc.
The consolidated accounting system has committed the companies to have their active costing system in which the management can obtain their own data, but we found most of the economic units face problems of applying the costing system because of reasons related to the system design itself or might be related to the requirements of the application success.
... Show Moreإمتاز ابن حجر بعلميته ، وغزارة عطائه في وضع كتب قيمة وتصانيف موسوعية فكانت كتبه هذه يشار لها بالبنان .
اعتنى الكثير من العلماء فاحتلت المرأة مكانة متميزة في كتبهم وخصصوا لمعطياتها أجزاء واضحة ضمن مؤلفاتهم ويعد أبن حجر أحد هؤلاء العلماء الافذاذ الذين اعتنوا بالمرأة ، وهذا يعني انه أفرد لها جزءاً خاصاً بها سماه ( كتاب النساء) وهو يقع ضمن الجزء الرابع من كتابه ، على الر
... Show MoreThis study Concentrates on modern variable in the human resources management that is Core Competency.
The field study is two of Public organizations, The first is Educational Baghdad Hospital, the other is the state Company for Batteries industry, the problem of the study determincs some questions and hypotheses. The data was Collected by questionnaire which Contains six Core Competences leader ship, Communication, frontline execution, development, innovation and self management .
The sample contains (26) doctores and (28) heads of departments in the company.
The study points out many conclusions, the main of it, there is significant differences amon
... Show MoreAbstract
Due to increased interest on organizations and the human element, organizational and environmental aspects of the organization Has been analyzed, and behavioral aspects of the members and what is the impact of each on the other, To give the recipe interaction between the organization and its environment, in order to bring about change in behavior appeared the concept of organizational health as a concept in a modern organizations, Either the organization to be stimulating good, healthy, and then called healthy organization Or that the situation be frustrating it is not good and unhealthy, so the cause of tension and anxiety, unhealthy organization is here The research aim to determine the existence of organizatio
... Show MoreAbstract
This study concerned of scientific analysis of sociological directions
among Iraqi scholars graduated before 1960. These directions was divided
between heritage, conflict, critical and symbolic interaction. It is important to
mention that Al-Wardi scholar tried to build a theory in Sociology focused on
the image of Iraqi personality through historical approach used by Arabian
scholar Ibn-Khaldon.