with regard to the importance of scientific decision-making in power plants prioritization to produce electrical energy (power) from renewable energies (purified), in this paper, research with specialists opinions with respond to questionnaires provided upon three efficient operational criterion in position of three presented power plant in country which used wind, solar water energies for prod...

In this paper, dual-rotor counter-rotating (CR) configurations of vertical axis wind turbines (VAWTs) are briefly inspected and divided into three types. This investigation was focused on one these types—the CR-VAWT with co-axial rotors, in which two equal rotors placed the same shaft, displaced from each other along it rotated opposite directions. For three-blade H-Darrieus properties design t...

The present study investigates the impact of rotor solidity and blade profile on self-starting characteristics performance H-Darrieus wind rotors (H-rotors) through subsonic tunnel experiments. Three symmetrical (NACA 0018) three unsymmetrical (NREL S823) H-rotors were analyzed to determine coefficient static torque (Cts) power (Cp) across solidities (σ = 0.25, 0.3, 0.35) two free stream speeds...

In this paper a roll-walking motion of a robot with a multi-rotor drive system is considered. The robot represents a rigid body with the multi-rotor drive system which consists of pairs of conjugate rotors located on the main axes. The multi-rotor drive system allows using conjugate spinups and captures of conjugate rotors to perform roll-walking motion of the robot. To perform a single step of...

production of electricity for promotion of people’s welfares is inevitable.there are about 54000 mw of various power plants in iran. the type of power plants includes gas, steam, combined, hydro and a very minute amount of wind mills. the per capita electricity production is about 2200 kwh. power plants can impose adverse environmental impacts during construction and utilization phases. envir...

most of electricity is generated by thermal power plants in iran. shahid rajaee thermal power plant consists of four 250mw natural gas and fuel oil burning units that is located at 100 km west off tehran. as a result of fuel oil burning in winter time, boilers air heaters are washed and cleaned frequently. the wastewater originating from air heater washing contains suspended solids and differen...

This paper proposes an approach for improving the plant efficiency by reducing the heat rejection temperature of power cycle using Kalina Cycle System 11 (KCS11) which is integrated at the steam condenser of a 500 MWe SubC (subcritical) coal-fired power plant. It is modelled by using power plant simulation software ‘Cycle Tempo’ at different plant operating conditions. Results show t...

Abstract This paper describes the development, design and function of a test rig for measurement small wind turbines in tunnel presents first exemplary measurements performance characteristics various horizontal vertical rotors. A central part this is developed control system with an electronic load, which enables automated recording measured values evaluation power coefficients (c p ) tip-spee...