نشریه انرژی ایران
سال هشتم شماره 3 (پیاپی 31، بهمن 1382)

The present industrial developments and daily growing need of energy, as well as economical and environmental problem caused by fossil fuels consumption, resulted certain constraint for the future demand of energy. During the past two decades great attention has been made to use renewable energy for different sectors. In this regard for the first time in Iran, design and construction of a 250 kW solar power plant in Shiraz, Iran is being carried out and it will go to operation within next year. The important elements of this power plant is an oil cycle and a steam cycle, and several studies have been done about design and operation of this power plant, both for steady state and transient conditions. For the steam cycle, initially a steam turbine was chosen and due to certain limitation it has been replaced by a steam engine. The steam engine is able to produce electricity with hot or saturated vapor at different pressures and temperatures. In this article, the effects of installing a steam engine and changing its vapor inlet pressure and also the effects of sending hot or saturated vapor to generate electricity are studied. Various cycle performance and daily electricity production are determined. The effects of oil cycle temperature on the collector field efficiency, and daily, monthly and annual amount of electricity production is calculated. Results are compared with the steam cycle output when it contains a steam turbine. It is found that with a steam engine it is possible to produce more annual electricity for certain conditions.

Ethyl benzene is the feed of styrene monomer production and its use is rapidly increasing in recent years. It is produced from alkylation of benzene with ethylene. A powerful tool for developing this process is the process simulator. In this Research, alkylation of benzene for production of Ethyl benzene has been simulated. Mass, energy and momentum balance equations for axial flow reactor have been developed. Optimization techniques have been used to improve the kinetic equations presented in literature to satisfy unit conditions. Model predict values, such as reactor temperature, pressure, reactant conversion and products composition are in good agreement with unit experimental results and they can be used with good precision to develop a pilot plant or new unit.

According to the ministry of energy, energy consumption per capita in Iran is more than developed countries. Huge consumption of energy is used in residential & commercial sectors, in which waste of energy can be noticed. This paper discusses the effect of intelligent power control panels in order to energy management in all different buildings. The result of this study shows that implementation of this system in caused eliminating leakage currents, earth fault. Optimum control of heating and cooling systems and reducing of heat lost in building utility. On the other hand, this method is caused minimizing damages and events due to electrical connections. Finally, research’s results shows that energy saving can be about 500,000 BOE/year for 100,000 residential sectors.

This article tries to study the new condition of GTL industry, economically through the survey of effective elements on a GTL projects cash flow. Elements like Oil Price, Gas Inlet Price, Capital and operating cost have investigated comprehensively and their affects on GTL project economy have shown by sensitivity analysis. Financial Indicators like IRR, NPV, Production cost and Payback period have used to economic evaluation of a typical GTL project. The results show that Oil price, Capex and Gas Inlet Price respectively are the most important effective factors on a GTL project cash flow and under certain assumptions a typical GTL project may achieve to the IRR more than 20 percent.

During social and economical developments within last two decade in Iran, which was the result of global advances, the problem of transition of government properties and authority to private sector, has been one of the major concerns of governments policy. This privatization policy also applies to electric power production industry of our country. Since three years ago, privatization of power plants has been started. The goal of this enterprise was mainly to absorb private investments, decrease government’s authority on power production plants, increase efficiency and render competition in production of electric energy. The authors of this abstract having regarded this issue as being a new concept in Iran economical situation and power production, have been given the incentive to search for scientific and technical supports on this matter, express as much as possible the measures of evaluating the power plants from both private sector and governments point of view and find access to relative information from domestic and international sources. To acquire useful ideas in this regard, we prepared survey charts with technical and economical inquiry formats for evaluating a power plant. The survey charts, were filled in and answered by experts, consultant engineers and customers By analyzing the outcome of survey, the subjects of the discussion were determined, In this regard, the authors of this abstract also took advantage of ideas received from consultant engineers. In this abstract, the evaluation measures are divided into technical and economical sections with effective parameters on each section, specified. By using financial measures in a power plant, the method of economic evaluation is outlined.

Nuclear power reactors are, in nature nonlinear and time varying. These characteristics must be considered, if large power variations occur in their working regime. In this paper a robust optimal gain scheduling controller for regulating the power of a nuclear reactor has been designed and simulated. The proposed controller is capable of regulating power levels in a wide power range (10% to 100% power levels). The controller achieves a fast and good transient response. The simulation results show that the proposed controller outperforms the fixed optimal control recently cited in the literature for nuclear power plants.