الفهرس 
الفصل الأوليوجد فقط 14 صفحة متاحة للعرض العام
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المستخلص
Energy efficiency and the reduction of carbon dioxide emissions that cause global warming are among the most critical issues discussed and applied in many countries around the world. Improving energy efficiency is one of the most constructive and cost-effective ways to address the challenges of high energy prices. Thermal insulation in educational buildings is the main tool for improving energy efficiency where the internal thermal environmental quality could be created for the users (student-teacher). Therefore, the research focuses on studying how to enhance thermal comfort, optimize electricity consumption, and reduce carbon dioxide emissions by using cement mortar mixed with Nano Cellulosic fibers as thermal insulation and eco-friendly material, to achieve lower thermal conductivity coefficients in the walls and ceilings of educational buildings, and in the perforated walls added to provide shading in the southern corridors exposed to direct sunlight. A practical study was conducted to calculate the values of the coefficient of thermal conductivity for various types of cement mortar including different concentrations of Nano Cellulosic fibers extracted from sugarcane bagasse (agriculture waste materials). The percentages of 10%, 20%, and 30% of Nano cellulosic fibers were added to cement mixtures. The differences in the physical properties (heat capacities, density, and coefficient of thermal conductivity) were measured after 28 days of sample preparation, and the values were compared to the ones of the current situation. The best alternative was then chosen. Simulation of thermal loads of the external envelope of the educational building exposed to the different climatic conditions before and after the insulation has been carried out by the Design-Builder program. It was found that with the use of the heat-insulating material (Nano cellulosic fibers) mixed with the cement mortar layer of the educational building, the value of the heat transfer coefficient (W/m2.K) was decreased by 47.2%. Therefore, it contributed to achieving thermal comfort in school buildings and a significant saving in electrical energy consumption used for cooling and heating in the private school buildings, in addition to a reduction in carbon dioxide emissions. It is highly recommended to use Nano Cellulosic fibers as a thermal insulator and eco-friendly material in the external envelope of local educational buildings (walls, ceilings, and the perforated walls added to the southern corridors) to achieve sustainability in educational buildings in Egypt.