The total energy balance sheet of Algeria in the year 2009 shows that the final energy consumption is evaluated as 30.98 million TEP (Ton oil equivalent) and emphasizes a prevalence of energy consumption in the household sector as more than 41% compared with 19% from the industry sector and 33% from transport. In this article, an analysis of the use of the various energy vectors in an individual dwelling (conventional and ecological house) in urban environment is presented. The thermal parameters influencing the building are evaluated, illustrating the potential for energy losses, as well as energy gains for both types of buildings. The results are compared to demonstrate the requirement to use more ecological materials for buildings to realize savings in energy and economic terms to reduce heating and cooling and to minimize emissions of CO 2 , for a more carbon-efficient-sustainable built environment.

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In this paper, we performed a first principle study for new half-Heusler LiSrX(X= N, P, and As) working with WIEN2k code in the frame work of the density functional theory, and the Boltzmann theory. We estimated the exchange-correlation potential by the generalized gradient approximation (GGA). Energetically, the three compounds show a high stability in structure type2, we notice that the lattice constant increased while bulk modulus decreased in replacing the ions of size increasing. Based on our calculations, LiSrN, LiSrP, and LiSrAs compounds are mechanically stable, and show semiconductor nature with indirect band gaps of 1.21, 1.75 for LiSrN and LiSrAs, and direct band gap of 1.94 eV for LiSrP. The thermoelectric properties are calculated for LiSrX (X=N, P, and As) and they found a high power factor for the p-type doping concentration.

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Our country must face a foreseeable shortage of fossil energies and the consequences of their carefree use. Since the consumption of energy is increasing from every year, we are obliged to develop innovating techniques to bring at least partial solutions to the double problems of the use of the resources and fight against pollution. The sector of housing carries a considerable share of the responsibilities in this matter. The objective of a passive house is to privilege thermal comfort while contributing to energy saving. Our vision of "ecological construction" is centred on the concept of "durability of the environment," i.e., the adoption of a lifestyle which makes it possible to preserve, to maintain, and to improve quality of the resources and natural balances, and thus to spare the future. The goal of our project is to carry out the following concept that allows to: minimize the energy needs calorific of the building while providing a good quality air inside; utilize renewable energy for the energy needs of the house; control the impacts of a building on the external environment; create an healthy and comfortable environment for its users; preserve the natural resources by optimizing their use, and; promote with sustainable development.