This study aims to use an integration of GIS and multi-criteria evaluation for combined-cycle power plant site selection and compares two aggregation methods for Iran. The information layers of the criteria are prepared in the GIS environment and then the layers standardised using fuzzy functions in IDRISI. All layers are combined using two conventional methods of fuzzy logic and weighted linear combination; from this information, the suitability maps were created. Results show that only 2.0% of the region under study is scored high-suitable using the fuzzy logic, while 21% of the area is considered as highly suitable when the weighted linear combination is used. Despite this significant difference, both approaches recommend the ideal place in the north and northwest of the study area. In conclusion, integrating GIS and multi-criteria evaluation is a comprehensive approach that improves and strengthens the suitability of site selection studies.

In this paper, a multi-objective optimization procedure, based on life cycle assessment is presented to optimize the common wall structures in climate of Tehran, Iran. Energy and water embodied in materials, energy dissipation through the wall, cost of material and global warming emission are taken into account as the objective functions. A common wall made of aerated brick (AB), concrete (C) (As the main wall structure) and an insulation layer of expanded polystyrene (EPS) is considered in the optimization process. Main wall orientations (south, west, east, north and roof) are examined in this paper. The effects of insulation position (inside or outside of the wall) on the optimum structure and insulation thickness are also investigated. The results are compared with previously published results, in which the optimization process was based on only energy consumption and cost of insulation materials. A comparison is also made with the minimum requirements of national regulations for buildings.