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This paper develops a simple modeling tool for designer green buildings. The designer can explore the nature of building, shape, fenestration, orientation and fabric thermal properties to minimize a buildings’ environmental effect. Aspects of heating, lighting, natural and mechanical ventilation with heat recovery systems can also be investigated. The model is best used to check that buildings will observe with the regulations or used as an early design aid rather than a detailed design simulator of building performance. The program should therefore be of particular interest to architects, building surveyors and building controllers rather than building service engineers. A project pilot program in Algeria has been lunched based on low energy consumption. It has been increasingly realized that the preservation of the environment is a guarantee of durability and stability of the process of economic and social development. Daily life in domestic buildings (heating, air conditioning) is responsible for more than 30% of emissions of greenhouse effect gases. It also appears that a suitable building construction and an adequate implementation can both reduce energy bills and household expenditure. Acting on buildings and environment, is to give all Algerians possibilities to live in an ecological habitat. That is why measures will be implemented which affects both existing buildings (over 7 million homes on 1 January 2007) during their rehabilitation and the new buildings as well. A large number of residential constructions do not seem responding to thermal comfort and energy savings needs. This can be explained by the absence of specific thermal regulations and, also, by the lack of know-how and an insufficient knowledge on the topic by the builders. A thermal calculation method has been developed taking into account the new HPE ‘High Performance Energy’ a voluntary process, which promotes high quality research in a sustainable development perspective. It is also essentially based on a new way of behaving in an indoor environment comfort, in order to reduce to the minimum the cost of energy used to heat the new or existing buildings. The recommendations of the centre of thermal regulations developed for the Algerian climate are taken as references in the choice of the computer model elaborated in our study as a tool. A personal program, named “EnergyArch” that models both outside and inside parameters acting on the building, using the thermal simulation of the architectural parameters and the climatic factors of the region.
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