Abstract Using the ground to produce condensate water for drinking and irrigation is A new application. This study simulates numerically the use of humid air flow in a buried pipe in the ground to obtain fresh water. The temperature difference between the humid air and the environment (ground) is exploited in this condensation process. The finite difference method is employed with pressure Correction method on staggered grid to simulate the flow of humid air through Buried pipes. The condensation occurs due to the decrease of the humid air Temperature below the dew point, as a result of the heat exchange between the humid air and the ground. The amount of condensation depends upon the flow Velocity, absolute humidity, Relative humidity and pipe geometry. For a selected pipe geometry of 22m long, and 0.2m diameter, the amount of condensation is about 26 kg/hr (0.006944kg/s). The results of the current study are in agreement to within ±10% of the results given by Jenney Lindblom.
مروان عبد السلام الهمشيري (2010)

شهدت مدينة طرابلس الكبرى قفزة نوعية في العديد من التعاقدات لتنفيذ مشاريع تنموية في البنى التحتية والاسكان وما يتطلب من مشاريع مرافقة إلا أنها في الآونة الاخيرة ومع بداية هذا العقد عانت أغلب تلك المشاريع من العديد من المشاكل، مما انعكس سلباً على كافة مراحل التنفيذ، لذلك تم القيام بهذه الدراسة هذه الدراسة للوقوف على أسباب التأخير في تلك المشاريع، وبالتالي العمل على إثراء المكتبة الليبية بالبحوث الميدانية التي تتناول موضوع أسباب التأخير في إكمال المشاريع الإنشائية، ويمكن أن تلفت الدراسة الحالية اهتمام الباحثين إلى معرفة الاسباب والتي أدت إلى التأخير في المشاريع، ودراسة كل سبب من ناحية ظروف حدوثه، وأهم النتائج المؤثرة سلبا على المشروعات، ونسق مساهمتها في التأخير، ومن خلال هذه الدراسة تم التعرف على الأسباب التي أدت للمساهمة في عرقلة تنفيذ المشاريع ببلدية طرابلس الكبرى، لأجل التركيز عليها مستقبلاً بهدف تفادي حدوثها. arabic 177 English 0
رجب عبدالله عبدالقادر حكومة, عبدالوهاب احمد دريبيكة(1-2019)

Abstract In spite of their widely-spread use across the globe, the domestic solar water heaters are still subject to essential, technical difficulties that need to be deeply studied. Such technical impediments are latent in how appropriate to each other the different, mutually-dependent components of the system are; and how appropriate they are to the prevailing meteorological conditions of the application site which is still under research and development. This thesis presents a clear-cut, straightforward mathematical model that determines the basic factors influencing such systems, and, in specific, discusses the optimum design month as well as the optimum tilt angle of the solar collector, bearing in mind the contribution of the energy obtained to meet the targeted load. Furthermore, the study considers the required thermal capacity that should be provided by the solar collector. To avoid assumptions that could be unjustified in practice, and to get as precise results as possible, the study was thoroughly based on normalized mathematical parameters. In the case where the total demand for energy used in water heating is to be fully satisfied by the solar energy system, provided that the required temperature of the heated water is 45oC and consumption is 100 (litre/day) per person for a given house, the results of the study concluded that according to the climate information of Tripoli city, 32.68°N latitude, the optimum design month is December, the optimum tilt angle is 75°, and the solar collector area fulfilling the following specifications: Glazed type, Fr () = 0.58, and Fr UL= 4.00 (W/m2oC) is 2.83 square meters. On the other hand, the results suggest an optimum tilt angle of 50°, which is the same angle obtained by the traditional technique, and solar collector area of 1.6 square meters if up to 80% of demand is to be covered by solar energy.
علاء بلقاسم العلوني (2010)