نشریه انرژی ایران
سال چهاردهم شماره 1 (پیاپی 50، بهار 1390)

Solar energy applications in Iran for supplying domestic hot water, space heating and cooling have Attracted considerable attentionin last decade. In this paper, a solar absorption chiller is designed to serve asa common typical office building in Tehran with floor area of 1300 m^2. Moreover, the rate of solar absorption chiller energy consumption in comparison with conventional absorption chillers is considered. The daily cooling system schedule is considered during May 5 to October 7 from 8:00 to 17:00. This study demonstrates that the single effect absorption chillers with hot water supply and solar evacuated tube collector for cooling application are the most significant compatible and suitable chillers and solar collectors. The power of this absorption chiller’s generator is 236 kW, of which 41% is supplied by evacuated tube collectors. Achieving this purpose requires utilizing 104 collectors which everyone compromises of 22 tubes with total absorber area of 184 m^2. With this replacement the investment payback rate would be 10.5 years.

Considering the importance of scientific decision-making for planning, in this article a decision making framework for long term electricity generation planning, has been studied. For this purpose, using LEAP software, some scenarios have been designed for 20 years power generation planning in Iran. These scenarios are evaluated using Analytical Hierarchy process (AHP), which is based on expert opinions. Because the energy resources in Iran can be categorized as fossil, nuclear and renewable resources, three scenarios, each based on one of resources,have been designed. Different criteria for evaluating scenarios were extracted from various papers. Also in order to consider local conditions in decision making, Indigenous criteria were extracted from visions, policies and laws of Iran. Finally experts’ opinions were collected and scenarios wereprioritized by Expert Choice software. The results indicate according to the opinion of expert group, fossil resources are the most appropriate scenario for Iran power planning and renewable scenario is the second priority. According to this study the least important issue for energy planning is environmental issue, Whereas technical issues and economic issues respectively are the most effective factors for decision-making in Iran.

This paper describes the model of aproton exchange membrane fuel cell (PEM fuel cell)for a one kilowatt UPS system. One of the critical issues to overcome in the PEM fuel cells is the water management. In this paper a steady state, two dimensional, isothermal model in a single PEM fuel cell using individual computational fluid dynamics code is presented. Different membranes are compared to investigate the effect of operating condition on the polarization curve of fuel cell. The maximum power of fuel cell with Gore-select membrane is the highest and the model predicts that the amounts of different fluxes of water are strong function of current density, which is related to external load. The model prediction polarization curves are compared with model predictions data reported in the validated open literature and a good compatibility is observed.

In the past few years, renewable energy sources specially wind farms have become more and more attractive for electrical utilities. Feasibility study is the first step in constructing Wind power plants. It evaluates thepossibility ofestablishingawindpower plant which is closely related to technical and economical aspects. Furthermore, site location and type of wind turbine play a prominent role in this study. Also, many topics such as the estimation of annual generation energy; capacity and number of turbines, interconnection method between wind power plant and network (the national or regional), should be determined in this study. In this paper Feasibility study for construction of a 10 MW power plant has beeninvestigated based entirely on the regional wind potential (MoravehTappeh), and meteorological data. All of statistical analysiswereperformed using COMFAR software.

Nowadays due to High cost of fuel, people are encouraged to use renewable energy sources (e.g. solar energy, wind energy). The reasons are that renewable energy sources are clean and infinite. In this paper wind-PV-fuel cell and battery banks are used to supply the demand of the micro-grid. The natural gas is used to produce hydrogen for fuel cells. So in this paper the effect of the cost of fuel on optimal size of each component in micro-grid has been evaluated. In this paper the sum of the total capital, operational and maintenance and replacement costs of distribution energy resource, penalty for interrupted loads and the cost of fuel are minimized.

Despite of global technological advancements, the world is still facing many challenges. One of the main challenges is the energy. Because oflimitedfossil fuel resources for supplying energy, we have to use renewable energy resources. solar energy is an alternative to fossil fuel in electric power generation. Usingsolar cell has unique advantages such as no environmental pollution, no industrial pollution, no need for network, distributed generation and very low maintenance costs. One of the main consumers of electrical energy in Iran is oil industry. considering the location of oil plants and no connection to electrical network such as oil wells in mountains, usingphotovoltaic cell isa good solution. This paper tries to Analyze design parameters of a photovoltaic system then analysisof financial and pollution of this system by retscreen Software. In this paper it has been tried to calculate the electricity consumption and costs of a typical oil unit then use of RETSCREEN software for financial and pollution analysis.

In this paper, wind energy resources in west Iran have been analyzed and estimated. Along with intense economic development and increasing energy consumption, clean, domestic and renewable energy can be the best option for future plans. The most important barrier for a wider deployment of renewable resources in Iran is the fossil fuel price which is the lowest in the world. Recently, government have decided to remove subsides for fossils, Therefore fossil fuel priceswill increase and this causes green energy price to be feasible. Wind power energy due to better economic conditions and very low environmental pollution today is very attractive. In this study we have used Geographic Information System (GIS) to determine the potential of wind energy resources in the west of Iranand explain the Multiple Criteria Decision Making method and site selection Criteria for wind resources assessment. In this research the desired criteria with equal importance have been investigated, these criteria include technical, environmental, economic and geographic standards. The results of this study are favorable for electricity production from wind, according to international standards in three states of west of Iran. Results have shown that 3% of study area has capacity for installing large wind turbines. Assuming that use of Gamesa G58 turbine model we can produce up to 1897 megawatts of wind power, which is26% of electrical supply region in 2026.