Study of the orientation of the building and the walls are made of solar water heater performance using software RETSCREEN (case study: Semnan)

Renewable energy such as solar energy in the world of particular interest to planners and technical intellectuals, political and economic located. Iran also due to the special geographical position in the exploitation of this type of energy has great potential. But a lot of fossil energy resources, cheap energy in the country and also the high cost of new technology for the initial investment, a bulwark against the development of these technologies is emerging. In this paper, considering the geographical conditions in Semnan, with a floor of an office building located in the area check Azad University of Semnan, by software Carrier thermal loads in various positions, including for the different geographical position and for two types of wall building materials were calculated and an optimum of them were selected. Then RETSCREEN Software evaluated by technical, economic, environmental and analyzed. Based on the results of the optimal geographical and wall materials, the savings in natural gas 2332 m3 / year and the reduction of emissions 2.1 Ton / year Co2 is. Also, consider two scenarios internal rate and rate of natural gas to the amount of the initial investment plan of 138312550 Rial and 4618 $, the profitability of 4.2% and 23.5% and payback period of 19.9 and 6.4 years, respectively.