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" Quantitative Analysis of in Dental Plaque Samples of Moroccan School Children with and Without Periodontitis "
Kum, John M.
Albandar, Jasim M.
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Latin Dissertation
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| Language of Document
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English
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| Record Number
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1104059
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| Doc. No
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TLpq1314816677
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| Main Entry
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E. M. A. Mokheimer
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Syed Hussain
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| Title & Author
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Modeling, analysis and optimization of the thermal performance of air conditioners\ Syed HussainE. M. A. Mokheimer
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| College
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King Fahd University of Petroleum and Minerals (Saudi Arabia)
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| Date
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2009
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| student score
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2009
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| Degree
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M.S.
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| Page No
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149
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| Abstract
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A large amount of the operating costs in a building is determined by the energy requirements of its air conditioning system. Coupled with the demand for more energy efficient units desired by both manufacturers and consumers, results in a dire necessity to have air conditioning units that are more energy efficient than the existing ones. In order to achieve the above mentioned features, a tool must be designed to simulate the thermal behavior of the air conditioners. The main objective of this work is to develop a mathematical model for air conditioning unit and coding it into Engineering Equation Solver (EES), a computer program. Once the mathematical model is coded, the thermal performance of three different air conditioning units is evaluated. These air conditioning units are then optimized for maximum Energy Efficiency Ratio (EER) by varying the design parameters by proposing modifications or enhancements in the existing unit. These modifications in the design increase the cost of the air conditioning unit. The AC units indicate an increase of 41.79, 32.52, and 28.24% in the EER corresponding to 38.14, 35.95, and 39.94% increase in the retail cost of AC units I, II, and II respectively. Later, the economics of these modifications is studied based on the measured terms such as the energy savings and the operating cost by evaluating the pay-back-period (PBP). The PBP for the AC units I, II, and III with maximum increase in the EER was evaluated to be 0.91, 0.86, and 1.26 years respectively at an electricity price of 0.2 SAR/kWh. Lastly, the effect of the proposed design modifications on the national economy and environment is evaluated. The results indicate an annual total national energy savings of 25,405.91 GWh, annual total national savings in natural gas (Methane) equivalent to be 5,742.17 million cu. mt, in gasoline and crude oil equivalents to be 40.64 and 38.28 million barrels, in USusd 2,679.61million.
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| Subject
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Applied sciences
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Mechanical engineering
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