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Abstract When we evaluate the performance of building, we choose the strengths and weaknesses elements which enable us to progress the design process and get the best elements that help us to live in nice premises associated with a good nature, easy-to-use and having the best exploitation career, and the elements of evaluation are many including the evaluation basis on good ventilation and thermal comfort inside the space and the integration between form and function and the easy accessing to the building, ... and other many elements that serve and help increasing the efficiency of the building. from those elements which the assessment is based on, is the component of energy consumption that the less the energy consumption the more the economic value of the building and its maintenance to be less as well, from here it is appear to us the importance of actual use of natural lighting as a lighting source in the building spaces, especially in regions and countries having very light and bright climate so the electrical power to be saved in the work time during the day, and it worth mentioning that the majority of office buildings in Egypt work in the moming only, therefore the use of natural lighting as an alternative to the industry lighting is an economic saving for the country. The importance of light is in identifying of features (or when seeing things surrounding us), that some things to be appeared through reflecting lights from those things to our eyes. Often been recognized that natural lighting is an important source of saving energy and provides visual and psychological comfort for the occupants of office buildings, that working in the day time with natural light is very comfortable to eyes and linked with nature and in addition its increase the labor productivity, (Tzempelikos, A. et al., 2007) and all the world as well get tired of consumption continuous electric power uses within buildings, particularly the huge buildings as offices Companies. Lighting is divided into two sections, artificial light: It is various kinds and forms, like white or fluorescent lighting and others ... and is a major consumer of energy in buildings, secondly: natural lighting, which comes from a natural source (the sun), and it is changing and depending on time, location, season, distance from the equator and the weather. (Millet, S.M. and Barrett, c.r, 1996) The natural light is divided into visible light and invisible ultraviolet, like infrared and the basic of our conversation here is the visible light. (Danny H.W. Li. et al., 2007; and SMITH, G.B. et al., 1998) Natural lighting is an important feature in the design which appears the beauty of environmental and the human factors together. Lighting design today (which can be seen a single subject under continuous design) can be explored from different views, it is not a general feature of different design that would address natural lighting by different people during the design process, in extreme cases, ”building scientists” to study the energy and environmental impacts of natural lighting, explore the ”designers” of formal and aesthetic results, and the title of ”behaviorists” is the humanitarian consequences of natural lighting installed and the problem is that the integration of disparate issues, natural lighting, it seem may include many of the considerations (and perhaps working people), many accept that the design includes natural lighting of the working environment, designed hardener, and other human factors. In spite of this, stress that the natural lighting within the context |