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Document Type |
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Project |
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Document Title |
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Optional positional and efficiency in the addition reactions of cyclic amines alpha - Kituniral. الاختيارية الموضعية والفاعلية في تفاعلات الإضافة الحلقية لإمينات الألفا - كيتونيتريل. |
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Document Language |
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Arabic |
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Abstract |
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Interested in this research to develop a new method to isolate the buildings heat to reduce the energy used in air conditioning buildings, In the first part the report reviews the importance of providing energy in the Kingdom of Saudi Arabia, in addition to reviewing the most important methods used in the insulation of buildings and methods of measuring the coefficient of thermal conductivity in solids. And has been reviewed the most important research on the use of materials, variable phase to be used to create a layer that stores heat during the day and fired through the night and turned out from this review that all current applications are for energy storage and not to prevent transmission, as well as difficult to analyze the mathematical process of change phase and that because of the so-called free boundary layer. And to assess the current methods of thermal insulation and by using pieces of polystyrene to fill the spaces inside the brick molds have been addressed and the building unit 20 × 20 × 20 cm square by nine holes, each 5 × 5 × 20 cm athletes. Where is the work of a mathematical model includes equations of heat transfer and thermal conductivity pregnancy in the walls of bricks' and the mathematical analysis that the air currents to help the internal heat transfer through the walls of buildings, and that the method of insulation used is currently developing pieces of polystyrene has helped in reducing the heat load by only 15% and when testing the unity of the building and the percentage of low heat load due to the use Albolestsrin to 26%. Began to study the use of variable-phase analysis of athletes to the heat transfer in a slide when a surface to a temperature change over time, similar to changing conditions in the air outside and in the light of this study and using the wax-type Rubitherm RT 42 melting point 43 5 m and was chosen thickness of the insulating wax so be less than 30 mm, were then measurements laboratory on a waxy 15 × 15 × 25 mm 3 was raised temperature by a light source of $ 650-Watt, and observed the arrival of the wax to the degree of roasting high and is what should be avoided when developing capsules wax, has been manufacturing three capsules of the same type of wax size, each 2 × 5 × 20 cm 3 and placed inside the holes and the construction unit and was heated, clear measurements that the temperature of the heated surface reached 8.60 5:00 p.m. in the case of building blocks the existence of spaces of air and rose to 7.67 17:00 the presence of polystyrene material, and decreased to 53 5 m in the case of the use of wax capsules, in all the experiments were the intensity of light falling on the surface of the hot and the construction unit 1070 W / m 2 and the surface is exposed to cold cooling pregnancy-free. |
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Publishing Year |
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1407 AH
1987 AD |
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Added Date |
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Wednesday, April 30, 2008 |
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Researchers
| صالح طاهر أزمرلي | ozmarli, saleh taher | Investigator | Doctorate | |
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