Over the past 6 years, the country’s energy production has increased as much as 8.29% per year on the average. At the present time, power plants play a major role in the production of greenhouse gases and the optimization of the systems of the newly-constructed po More
Over the past 6 years, the country’s energy production has increased as much as 8.29% per year on the average. At the present time, power plants play a major role in the production of greenhouse gases and the optimization of the systems of the newly-constructed power plants is one of the country’s main environmental challenges. Therefore, the assessment of the construction of energy recovery systems aiming at increasing the efficiency of gas power plants with little pollution can be a great help to the environment. In this study, a techno-economic evaluation of energy recovery systems has been done in Kerman power plant considering air pollution reduction. Fortunately, the potentials for the construction of combined cycle power plants exist in the country. Since such power plants save the fuel and increase the efficiency, they can reduce contaminating gases. The application of energy recovery systems in gas power plants is quite economical and their pay-back rate is 9-10 years. The results of the present study show that with these plants, 152 million liters of gas-oil and 58.3 billion cubic meters of natural gas will be saved over a period of 30 years. As a result, 1.652 million tons of greenhouse gases will be reduced.
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Solar combi-systems have attracted more attention technologically and economically compared with the other thermal applications of the solar energy in the world. The reason why these systems are preferred for the provision of hot water and solar heating is that they nee More
Solar combi-systems have attracted more attention technologically and economically compared with the other thermal applications of the solar energy in the world. The reason why these systems are preferred for the provision of hot water and solar heating is that they need a medium temperature which can be supplied by flat-plate collectors and at a lower cost than that of other types of collectors. In this paper, first the thermal loads of residential apartments (in two cases: with common materials and with materials dictated by the national rules of construction) in Hamedan and Karaj have been computed. Then, suitable solar combi-systems have been designed for each apartment. Subsequently, the rate of thermal energy that can be provided by this system and windows has been calculated. In the next step, considering the heating energy needed by building and studying the expense-efficiency curve of the solar combi-system, the number of solar flat-plate collectors has been calculated, and considering the effect of solar panels shadow and the space limitation of the roof, a hybrid (fossil-solar) system has been proposed. The results show that the average solar energy which can be used varies from 15 1o 45 percents in the cold months of the year. Consequently, considering the annual fuel savings and also the reduction of social costs in cold regions using the solar combi-system as well as the international price of energy, about 43 million Rials will be saved in fuel costs so that the initial high investment expenses will be returned in less than two years. In the same way, about 10 million Rials will be saved in fuel costs in temperate regions; therefore, the initial investment expenses will be returned in four years
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In this research social (external) cost of NOx, SO2 and CO2 emissions from energy sector (powerplants) in Iran were estimated. For the first time, we used benefit transfer method and by adjustinginternational coefficients of social costs, these costs estimated for each More
In this research social (external) cost of NOx, SO2 and CO2 emissions from energy sector (powerplants) in Iran were estimated. For the first time, we used benefit transfer method and by adjustinginternational coefficients of social costs, these costs estimated for each kind of power plants (includingsteam, gaseous, and combined cycle). Different scenarios in this research are consisting of carbontrading, life statistical indexes, etc. At first level we survey 5 selected power plants (for case study) inIran and then the results generalized to all power plants.Social (external) costs for 3 above mentioned gases; each type of power plants and for one kilowatthours of electricity was estimated. The range of social (external) cost for each Kwh of electricity is690 to 1330 Rials. The results define that average social (external) cost per kilowatt hours is about1330 Rials.
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