الفهرس 
chapter 1Only 14 pages are availabe for public view
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Abstract
This research could be approached as a new attempt of studying the triple symmetry of which Architecture, Environment and Economy. Doubtlessly the buildings in Egypt suffer from many problems. It mainly exists because of the fact that the architectural design of most of the buildings in Egypt ignores the effect of the surrounding climatic conditions on the indoor climate and thus failing to achieve full thermal comfort for the users through the natural potentialities of the climatic design. This in turn affects their health and the way they perform the usual daily activities within their homes .Some buildings may achieve the thermal comfort, but in order for them to do that, they use financially costly mechanical means, and they may be highly consuming in energy which harms the environment. The research aims at setting a methodology with which to evaluate the economic feasibility of the thermal performance of external walls as a basic element of the building envelope ones, in an attempt to facilitate the process of design-making- decision as for the kind of external walls to be chosen. The research will attempt an answer the question if the building owner will regain the costs he spent for achieving the conditions of the Egyptian energy code in return for reducing the energy consumption and doing without the mechanical air-conditioning appliances., or not. The research has designed a program for the computer helps to choose of the optimum different alternatives of external walls sections in residential buildings in all of the climatic regions in Egypt. Thermal Performance, External Wall Section, economic.