تجزیه و تحلیل عملکرد انرژی از یکپارچه سازی پاکت های ساختمان با نانومواد
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Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)
Journal : International Journal of Sustainable Built Environment, Volume 2, Issue 2, December 2013, Pages 209–223
The energy consumption in Egypt has increased sharply in the past few years, and ultra-energy efficient technologies are desperately needed for the national energy policy. This paper discusses and explores the possibilities offered by the use of nanomaterial technology which integrates with building envelope to improve the Energy efficiency and reduce energy consumption in buildings by the use of energy simulation software. The current study was aimed at testing the thermal performance of the Nano Thermal Model (NTM) and measuring heat-Transfer Rate, especially the quantity of Heat gain/loss through fabric, compared to conventional building envelope materials (baseline model) under typical Egypt-Aswan weather conditions. The results indicate the use of nanomaterials can improve the thermal performance of a building in hot dry climate like Egypt, that especially needed cooling loads during the summer months. It also shows that the nanomaterials integrated with the envelope of the future building will achieve the lowest scientifically and empirically recorded values of heat transition in the field of construction. This lowest rates of the fabric heat transfer through the envelope is up to 72% when comparing the performance of the wholly Nano Thermal Model to the traditional model improved.
The sector of architecture, engineering and construction may accept a wide range of Nanotechnology applications and the nanomaterials. There is an increasing rate of spending and financial support for developing the nanomaterial technology with the target of gaining short run profits for their great commercial value (Ge and Gao, 2008). Architectural Engineering and construction technology which are based on nanomaterials experience a lot of significant changes and constant developments that were the most important results of the chief technologies in the 21st century. Creating all the suitable conditions for achieving accuracy at the molecular and atomic level in materials engineering has led to production of materials of many unique qualities which in turn has provided new and promising solutions for many problems such as; reducing the rate of heat absorption in the outer envelope of the building, fire resistance, avoiding energy loss, resources conservation, reducing pollution, raising the internal environment efficiency, extending the life span of the building materials, lowering the costs of maintenance and processing, reducing and controlling the construction loads and increasing the tensile strength in the structural elements, etc. (Lalbakhsh and Shirazpour, 2011). Therefore, the nanomaterials integrated with the envelope of the building are considered excellent economic alternatives which save a lot of money while raising the efficiency of the constructed environment and addressing the future environmental challenges (Lalbakhsh and Shirazpour, 2011). Nanomaterial technology will serve to provide much more internal and external architectural designs with human senses interaction due to the freedom given to the architects to develop the function and format to meet the various needs of users.
نتیجه گیری انگلیسی
From the comparison among all the previous cases and simulation studies which are summarised in Figure 26, Figure 27 and Figure 28, we can conclude that: - The thermal performance of the Nano paints was totally better than that of the traditional paints. It reduced the rates of the heat exchange process outcome through the outer envelope to 40% in the case of the external and internal surfaces and up to 30% in the case of the external surfaces only. This confirms the possibility of access to convergent rates in the thermal performance in both cases. - Using the Nano insulating layers in the outer walls can achieve better values of fabric heat transfer than walls insulated with the traditional substances (such as polystyrene) which were of the best insulating substances that have high rates of performance. The study concluded that Thermal transmittance coefficient (U-value) is eight (8) times less than traditional insulation materials, which has resulted in reducing rates of fabric heat transfer through the envelope by 45%. - Achieving optimal values of Thermal transmittance coefficient (U-value) of the roof insulation that is nine (9) times less than traditional insulation materials, as well as reducing the outcome of fabric heat transfer between the outer environment and the inner space by 44%. - The significant influence of windows in the building envelope on the thermal performance and heat exchange processes can be achieved by using Nano glass material. They led to reduction in the heat exchange processes over the windows made of single monolayer glass by 81%. This value was 55% with respect to the windows made of dual-layer low-emission glasses, which are of the best types in reducing rates of thermal transition and enhancing the thermal performance of the inner space. - The nanomaterials integrated with the envelope of the future building achieved the lowest scientifically and empirically recorded values of heat transition in the field of construction. The lowest rates of heat exchange in the envelope is up to 72% when comparing the performance of the wholly Nano Thermal Model to the traditional model improved. - Using the nanomaterials can improve the thermal performance of a building, especially needed cooling loads during the summer months, and achieve an ultra-low U-value and advanced performance of fabric gains (Walls: 40% – roofs: 44% – Windows: 81% – Overall: 72%) less than baseline model. - The thermal lag value of the Nano paints (12.05 h) and Nano insulation (walls: 16.48 h – roofs: 12.66) was better than that of the traditional insulation materials. Full-size image (42 K) Figure 26. Achieving the lowest value recorded scientifically of heat transfer values of Nano model which amounted to over 70% when compared to the baseline model. Figure options Full-size image (41 K) Figure 27. Achieving ultra-low U-values and advanced performance of Nano model less than baseline model. Figure options Full-size image (44 K) Figure 28. Increasing the thermal lag values of Nano model compared to the baseline model.