نشریه انرژی ایران
سال ششم شماره 2 (پیاپی 27، اسفند 1380)

Regarding the limited resources of the fossil energy in the world and increases of the energy consumption level. We have to search for new sources of energy. New sources of energy like wind power; sun power, etc. could have special position in this regard. Using the energy of wind beside the other energy sources for pumping water in villages of the country, which have agricultural potentials. Will cause the development of agriculture., employment, prevention of immigration of the rural population into the cities, etc. In this article we will study using the wind energy in agriculture and irrigation

One of the recent challenges in the petroleum refineries is the reduction of sulfur content of gas oil to the new lower limits (in the European community the diesel sulfur content has been limited to 0.05 wt% since Oct 1996. For the near future this content will be lowered to 0.035 wt %). This purpose can be achieved by hydrodesulfurization process (HDS) in trickle bed reactors as specific multiphase reactors. In the most of trickle bed reactors, reactions are carried out on the surface and within the pores of cobalt molybdom over alumina support (CoMo/Al2O3). Catalyst. [1] In this work a mathematical model for the effectiveness factor of HDS catalyst has been developed, based on the mass balance equations inside the catalyst pellet to gather with a kinetic model for dibenzothiophene as representative of sulfur component of gas oil. Also, for solution non-linear algebraic equations in catalyst pellets has been used orthogonal collocation method and modified Powel dogleg numeric methods.

Anaerobic Digestion is one of the various methods for energy generation from Biomass. This technology is feasible in Iran due to a number of advantages such as appropriate composition of Municipal Solid Waste (MSW), simple technology, and avoiding environmental problems. Anaerobic Digestion technology is initially identified in this paper, then, MSW in Iran is studied as a feed for Anaerobic Digestion. Finally, current worldwide techniques for Anaerobic Digestion of Solid Waste (such as Dranco, Kompogas, Valorga, Biocell and BTA) are mentioned and investigated at a glance.

Input-Output table is an expression of economic performance of a country by the period of one year. This table will divide the economy into three parts and will indicate the current transaction of commodities or activities between economic sectors. The rows of the table will show the flow of the production and their distribution between sectors and the columns will indicate purchases and cost of the sectors. If in a input-output table, intersectional transaction matrix includes energy and non-energy activities, then we can easily explain the relation of energy sector with other economic sectors. Using such a table can help us to compute total energy intensity (direct and indirect energy intensity) and also within that we can evaluate the inflammatory impact of energy prices adjustment. Updating the energy input-output table for the year 1994, has been followed by Modeling & Coordination department of energy planning bureau, Ministry of energy and with cooperation of Iran Statistical center’s experts. Summary outcomes of this research has been presented in this paper. The information of this table shows that, 68% of energy consumption in 1994 has been used as an intermediate input. Also the share of energy in intermediate expenditure was about 5.8 percent.

The basic design is made for a 250 kw solar power plant. The main element of the plant is the collectors. Base on system simulation, a parabolic collector constructed and tested for one year. The model is first validated with experimental measurement and a detail numerical model is also developed to study effects of various optical properties of mirrors and receiver on the thermal performance of the collectors. It is observed that due to poor optical properties of the present collector, it would not be able to produce hot oil with desired temperature. Improving the material of the mirrors and the receiver tube, thermal performances exceed substantially from the design conditions. By considering available optical properties simulation is made to estimate yearly steady and unsteady behavior and the performance of the power plant for three locations: Shiraz, Yazd and Lar in Iran. Comparison of the yearly performance of the cycle shows that unsteady behavior reveals different results and simulations approach a reliable technique to study such cycle