@article{ author = {Moieni, S and Javadi, SH and Kokabi, M and Nanshadi, M}, title = {Estimating the Solar Radiotion in Iran by Using the Optimal Model}, abstract ={Sunshine hours are the only long time duration, reliable and available measured information that can be used to reach highly accurate estimates of solar radiation values on the Earth surface. In this paper the sunshine duration is used to estimate monthly average daily solar radiation on a horizontal surface, it can be used to predict solar radiation in different climatic region of Iran. According to the Kopen classification of climate and considering the sunshine hours five climatic regions are identified for Iran. One of the best models that used sunshine duration to estimate monthly average daily solar radiation on a horizontal surface is the Angström model. Angström coefficients depend on geographical and meteorological parameters, The equation developed are employed to calculate the monthly average daily global solar radiation for various location of Iran, By using the pyranometric stations solar radiation data(H) and the daily sunshine hours (n) will be measured sunshine recorders which were achieved by IRIMO and by calculating N,H0 from Angström equations and utilizing spss software ,a regression relation for this five region of Iran has been obtained.}, Keywords = {Renewable Energy, Solar Radiation, optimum Model, Angstrom}, volume = {13}, Number = {2}, pages = {1-10}, publisher = {Iranian National Energy Committee}, url = {http://necjournals.ir/article-1-33-en.html}, eprint = {http://necjournals.ir/article-1-33-en.pdf}, journal = {Iranian Journal of Energy}, issn = {1028-3706}, eissn = {2322-1240}, year = {2010} } @article{ author = {Mahmoodi, A.M and Golnshan, A.A}, title = {Investigation of Thermal Performance of Unglazed Transpired-Plate Solar Collectors in Perpendiclar Wind}, abstract ={Renewable energies have received substantial attention due to exceeding rate of energy demand and diminishing rate of energy resources. In this direction solar energy as the future supplier of part of the world’s energy demand is at the frontier. Using unglazed transpired-plate solar collectors (UTCs) to provide heat for crop drying and ventilation air heating of large spaces such as factories and industrial companies is now promising due to their high efficiency and low cost. In this research the thermal efficiency of such collectors, which are mounted open to the atmosphere and are subjected to wind and solar radiation is investigated. Wind is assumed to blow perpendicular to the perforated absorber plate while the heated air is sucked from the back through the perforations. Different perforation geometries for a number of plate’s material are considered while the wind speed and suction rate is changing. Effective parameters are determined and the effect of each parameter on the thermal performance of the collector is investigated. Heat transfer from the back side of the plate is considered as well. Results show that the overall thermal behaviors of these collectors, in the perpendicular flow, are almost similar to those for parallel flow although some deviations are observed.}, Keywords = {perforated absorber plate, thermal performance, unglazed collectors, solar collectors}, volume = {13}, Number = {2}, pages = {11-22}, publisher = {Iranian National Energy Committee}, url = {http://necjournals.ir/article-1-34-en.html}, eprint = {http://necjournals.ir/article-1-34-en.pdf}, journal = {Iranian Journal of Energy}, issn = {1028-3706}, eissn = {2322-1240}, year = {2010} } @article{ author = {Fadai, D and ShamsEsfandabadi, Z and Abbasi, A}, title = {A Review on the Causes of Failure in Achieving the Goals of Iran’s Renewable Energy Sector in the Fourth Development Plan}, abstract ={Energy crisis is one of the issues which have caused many changes in the development of various technologies. Every-year renewal of this crisis in different countries around the world has led many of them to move towards alternative and renewable energy resources and make changes in their energy consumption basket and future programs in order to develop the application of these resources in their country. Considering Iran’s good potential in renewable energies, and also its plan to go towards real prices of energy carriers to expand the application of these kinds of energies along with the worldwide changes, it is necessary to review the facilities, and policy and administrative structures in the field of renewable energies in the country to speed their development with the help of designing a flexible and dynamic structure and removing the existing obstacles and problems. This article reviews the potential of renewable energies in Iran and the countrys current situation in relation to achieving the goals of the fourth development plan in the field of development of renewable energies application, and discusses the barriers and causes of non-realization of these objectives}, Keywords = {Renewable Energies, the Fourth Development Plan, Energy Policy Making and Planning, Iran.}, volume = {13}, Number = {2}, pages = {23-34}, publisher = {Iranian National Energy Committee}, url = {http://necjournals.ir/article-1-35-en.html}, eprint = {http://necjournals.ir/article-1-35-en.pdf}, journal = {Iranian Journal of Energy}, issn = {1028-3706}, eissn = {2322-1240}, year = {2010} } @article{ author = {Ebrahimi, M and Heidari, M}, title = {Conventional CHP in Comparison With SOFC-CHP Through Second Law of Thermodynamics}, abstract ={SOFC-GT cycle coupled with a steam generator is investigated in this paper through the exergy analysis. Chemical and electrochemical simulation of SOFCs and thermodynamic and exergy models of other components are discussed and results are compared with a GT-Steam generator cycle. Based on simulation results Exergy efficiency of SOFC-GT- Steam generator is higher than conventional GT-Steam generator cycle. Furthermore parametric study is performed and results are presented. Parametric study shows that stack temperature and compressor pressure ratio can increase the efficiency but cell current density and TIT decrease the efficiency. Increase in steam pressure and decrease in Pinch Point, will increase the exergy efficiency.}, Keywords = {Exergy, Energy, SOFC, CHP, HRSG OptQuest Software}, volume = {13}, Number = {2}, pages = {35-48}, publisher = {Iranian National Energy Committee}, url = {http://necjournals.ir/article-1-36-en.html}, eprint = {http://necjournals.ir/article-1-36-en.pdf}, journal = {Iranian Journal of Energy}, issn = {1028-3706}, eissn = {2322-1240}, year = {2010} } @article{ author = {Fakehi, A.H and Ghofrani, M.B and Saboohi, Y}, title = {A Multi-regional Model for Optimal Expansion Planning of Electrical Energy Supply System in the Competitive Environment}, abstract ={During recent years, restructuring of energy systems has been triggered as a drastic movement by many countries. Relevant experiences show that pure market mechanism will not ensure long-term demand satisfaction and optimal expansion of the supply system. Therefore, expansion planning of the energy supply system is considered as a fundamental issue in the restructuring studies. Unlike conventional systems, Competitive condition makes planning more complex in new systems. Analysis of recent studies in long-term energy system development shows that the market equilibrium evaluation is an effective and useful technique that is used to analyze the optimum condition of the energy supply system. In this paper, basically a Nash-Cornet Market Equilibrium model has been suggested to predict long-term expansion of the electricity generation system. Conventional version of this technique is very complex due to high span of existing dataset and variables, so one may not find a clear solution to solve it. Thus, to find an approximate solution for the suggested model, an algorithm based a combination of static and dynamic equilibrium planning methods has been established. Discounted net profit has been considered as a goal function for each generation company to be maximized during the long-term horizon. Implementation of the algorithm and its case study results over a hypothetical power generation system are presented.}, Keywords = {Generation Expansion Planning, Energy Supply System Modeling, Nash-Cornet Equilibrium}, volume = {13}, Number = {2}, pages = {49-66}, publisher = {Iranian National Energy Committee}, url = {http://necjournals.ir/article-1-37-en.html}, eprint = {http://necjournals.ir/article-1-37-en.pdf}, journal = {Iranian Journal of Energy}, issn = {1028-3706}, eissn = {2322-1240}, year = {2010} } @article{ author = {Kargari, N and Mastouri, R}, title = {Comparison of GHG Emission in Different Kinds of Power Plants by LCA Approach}, abstract ={There are no power generation systems without environmental impacts. Environmental impacts are in all stages of power generation process including resource extraction, facilities production, material transportation, power use and waste disposal. Some of the environmental impacts are air pollution (pollutant emissions like PM-10, SO2, NOx, CO, toxic pollutants such as Hg and etc.), greenhouse gas (GHG) emissions, land use, impact on ecosystems (fauna and flora) and impact on human health. Life cycle assessment (LCA) methodology could characterize environmental impacts in all stages of life cycle of power generation. Different power generation systems could be comprised by LCA too. Considering the importance of GHG emission and climate change, this paper attempts to comprise GHG emissions in life cycle of different kinds of power plants (including fossil fuels power plants, nuclear power plants, photovoltaic power plants, wind power plants, hydropower and biomass power plants).}, Keywords = {life cycle assessment (LCA), climate change, greenhouse gases, power plants}, volume = {13}, Number = {2}, pages = {67-78}, publisher = {Iranian National Energy Committee}, url = {http://necjournals.ir/article-1-38-en.html}, eprint = {http://necjournals.ir/article-1-38-en.pdf}, journal = {Iranian Journal of Energy}, issn = {1028-3706}, eissn = {2322-1240}, year = {2010} } @article{ author = {Ghoodarzirad, R}, title = {Analysis of Industrial Energy Consumption of Iran Using Decomposition Analysis}, abstract ={Analysis of energy consumption in different sectors is an important point in energy planning. A recently widely used technique with relatively high capability in field of industrial energy demand modeling is the decomposition analysis. The paper uses this technique to analyze industrial energy consumption of Iran in 2001-2005. Results of the paper show that the production effect was the main factor in variations of industrial energy consumption in this period, and the energy intensity and structural effects placed on the further steps. Furthermore, the energy intensity effect had more effect on the industrial energy conservation than the structural effect.}, Keywords = {Decomposition Analysis- Industry- Production Effect- Structural Effect- Energy Intensity Effect}, volume = {13}, Number = {2}, pages = {79-84}, publisher = {Iranian National Energy Committee}, url = {http://necjournals.ir/article-1-39-en.html}, eprint = {http://necjournals.ir/article-1-39-en.pdf}, journal = {Iranian Journal of Energy}, issn = {1028-3706}, eissn = {2322-1240}, year = {2010} }