Mohammadpour Penchah M.,Hormozgan University |
Malakooti H.,Hormozgan University |
Satkin M.,Renewable Energy Organization of Iran
Renewable Energy | Year: 2017
The usual way to collect wind data for wind resource assessment is installing wind masts, which might not be feasible due to the cost or time constraints. Conducting qualified long term numerical simulations is classified as a new method for this purpose. In this study, WRF model experiments are evaluated for simulating wind field over east of Iran. Planetary Boundary Layer (PBL) physical parameterization plays an important role in the structure of simulated low level wind field. Evaluation of PBL schemes over the study area could be an essential issue for reduction of simulated wind errors. The ACM2, MYJ, MYNN2.5, QNSE and YSU PBL schemes are evaluated during July and December 2007. The MYJ PBL scheme showed the best performance for Fadeshk area. We then carried out one-year simulations for the whole of 2007 and simulated wind field and wind energy productions compared to the measurement wind data. Wind distribution during 2007 was simulated well with this PBL scheme, although it showed overestimations over 3 a.m. – 8 p.m. of day and underestimation over 8 p.m. -3 a.m. Relative errors for shape parameter, scale parameter, mean of Weibull distribution and wind power are estimated equal to 13.2%, 5.54%, 4.85% and −0.47% respectively. Overall, model has good performance in simulation of wind energy parameters in this area. © 2017 Elsevier Ltd
Mohammadkarim A.,Islamic Azad University at Tehran |
Kasaeian A.,University of Tehran |
Kaabinejadian A.,Renewable Energy Organization of Iran
International Journal of Renewable Energy Research | Year: 2014
Outlet temperature of the collector for efficiency of water-in-glass evacuated tube solar domestic hot water system with natural circulation is generally more than the flat plate collector systems. Additionally, this type of evacuated tube solar collectors with the free circulation is economically cheaper than heat pipes collector systems, this system is widely used in the world. This paper is dedicated to simulation of evacuated tube solar water heating system with natural circulation under the climatic conditions in Tehran city with TRNSYS software. Diagram of the components used in the simulation of the TRNSYS has fully been studied including Type71 for evacuated tube collector with horizontal tank above it with natural circulation and five nodes in the vertically tank stratified in order to control the temperatures out of the collector. Vertical tank increases the tank temperature out of the collector for the household uses. After the simulation we obtain the regression linear curve of the efficiency of the evacuated tube solar domestic hot water system against heat loss of this system in spring and summer seasons with the solar irradiation and mean and ambient temperature in each selected day.
Rahmatmand A.,Shiraz University |
Yaghoubi M.,Shiraz University |
Raesi M.,Shiraz University |
Niknia I.,Shiraz University |
Kanan P.,Renewable Energy Organization of Iran
Journal of Optoelectronics and Advanced Materials | Year: 2013
Among concentrated solar power (CSP) technologies, parabolic trough technology has been established worldwide due to current advances in technical and economical development of these systems. In this paper, durability and performance of current configuration of Shiraz Solar Power Plant (250 kW) is analyzed using the measurements of important parameters including the oil inlet/outlet temperature of the collector's field, thermal efficiency, direct radiation during 2009-2011 and system major deficiencies regarding installation and operating condition are discussed. In addition, effects of different factors on thermal efficiency of collector's field such as dust deposition and sun tracking are also studied.
News Article | October 6, 2016
Iran's top renewable-energy authority denied that it's signed any agreement covering electricity generation projects with a Swiss developer that has said it obtained power-purchase agreements for 370 megawatts of installations. The Renewable Energy Organization of Iran, which is known as Suna, hasn't signed any deal with MECI Group International, said Jafar Mohamadnejad Sigaroudi, the deputy in charge of planning and development at the organization and an official authorized to speak publicly about the government's activities in the industry.
Esfahanian V.,University of Tehran |
Salavati Pour A.,University of Tehran |
Harsini I.,Islamic Azad University at Karaj |
Haghani A.,Renewable Energy Organization of Iran |
And 3 more authors.
Journal of Wind Engineering and Industrial Aerodynamics | Year: 2013
In this study, a mixed CFD (Computational Fluid Dynamics) and BEM (Blade Element Momentum Method) analysis is implemented for simulating the flow field around a wind turbine rotor to predict the aerodynamic performance such as the Power Curve diagram and the forces and moments imposed on the rotor blades that are essential in structure and/or aeroelastic design. The present approach requires considerable less computational time and memory than three-dimensional simulation of a wind turbine rotor by merely CFD methods, while retains the desirable accuracy. This work consists of two parts: 1-calculating 2D aerodynamic coefficients of several spanwise sections of the blades by CFD methods, using Fluent commercial software. 2-Simulating 3D-flow field through the wind turbine rotor using the BEM technique. To validate the current approach, the Combined Experiment Phase II Horizontal Axis Wind Turbine known as NREL Phase II Rotor is used. The comparison indicates that the combination of CFD and BEM methods is much faster than merely CFD approaches while accurate enough to be used for engineering purposes. © 2013 Elsevier Ltd.
Abdoli M.A.,University of Tehran |
Amiri L.,University of Tehran |
Baghvand A.,University of Tehran |
Nasiri J.,Renewable Energy Organization of Iran |
Madadian E.,McGill University
Environmental Progress and Sustainable Energy | Year: 2014
Anaerobic digestion (AD) treatment of agricultural and animal waste can be considered as a means of enabling environmental remediation. This research investigated two conditions of anaerobic co-digestion of maize waste and cow dung. This was done by placing a mixture of cow dung and maize waste together in a floating drum digester that was run at two different cow dung/maize ratios of 10:1 and 10:5. Batch conditions were on a bench-scale of AD, 5 L in volume, developed to operate under mesophilic (36 ± 1°C). Results showed that biogas and methane yields from mesophilic digestion at the ratio of 10:1 were lower than yields obtained at ratio tested in the second run (10:5). Biogas yields were 250 and 480 L/kg VS for first and second runs, respectively. In the case of methane, these amounts were presented at 130 and 300 L/kg VS. Furthermore, the average methane content of biogas was calculated as 51 and 62%, in first and second runs respectively. The total biogas production of the reactor increased by 92% when substrates were fed in second condition ratio compared to biogas production during the first condition ratio. In continue the effect of adding maize waste on biogas yield from cow dung was evaluated in batch digesters under mesophilic conditions. The addition of maize waste to cow dung presents a viable method to improve biogas yield, as well as a means to use maize waste. Copyright © 2013 American Institute of Chemical Engineers Environ Prog.
News Article | November 24, 2016
Countries all over the world are embracing renewables as a source of affordable clean energy – even countries you might not expect. Countries all over the world are embracing renewables as a source of affordable clean energy – even countries many associate directly with the oil, coal, and gas industries. Thanks in large part to the Paris Agreement, more world leaders than ever are recognizing the many economic benefits of cleaning up their act. Here are six nations whose efforts to become more sustainable in a world shifting away from dirty fossil fuels in favor of clean, renewable energy may come as a bit of a surprise. Saudi Arabia is a nation often thought to be synonymous with oil. But just this year, the Saudi government tightened efficiency requirements for air conditioners, set fuel economy standards for cars, and required insulation for new buildings. The country also announced “Vision 2030,” a 15-year plan to become less reliant on oil exports. The proposal includes replacing 14 percent of the country’s current power generating capacity with domestic solar energy. Russia, the world’s largest producer of crude oil and the second-largest producer of dry natural gas, is making some sustainable changes. Russian President Vladimir Putin has declared 2017 the “Year of the Environment,” providing a great opportunity to bring environmental issues to the Russian public’s eye to create momentum for a green technology revolution in a country that is rich with diverse renewable energy sources and has a highly skilled workforce. South Korea has developed greatly within the last 20-30 years, particularly in the city of Seoul, where Mayor Park Won-Soon believes that locally producing renewable energy can help mitigate the climate crisis. Won-Soon, motivated by the nuclear disaster in Fukushima, Japan, launched a campaign encouraging Seoul’s 10 million residents to change the way they consume energy. Within three years, the city reduced its net energy consumption by four percent. Additionally, Park has created a citywide program to pay for solar panels that would generate power for local apartments, homes, and businesses. The oil-rich nation of Iran is taking steps to begin partially running on renewable energy. In 2014, President Hassan Rouhani committed to adding 5,000 megawatts of renewable electricity to the country’s grid by the year 2020 – enough to power up to two million homes. The government appointed the Renewable Energy Organization of Iran to help it achieve this goal. Currently, nearly 200 megawatts of electricity are generated from renewable resources, predominately wind and solar. Venezuela, home to some of the world’s largest oil reserves, is in the midst of an energy crisis. The nation receives much of its energy from hydropower, with about half of it produced by a single dam. So the nation’s now-three years-long drought has proven crippling. The Foundation for the Development of Electric Service has been helping to alleviate some of the stress by installing solar panels and providing clean drinking water for isolated communities that are off the nation’s electric grid. Following the first phase of the program in 2009, over 800 systems were installed in 550 communities, along with 110 solar powered water purification systems. They have helped an estimated 200,000 people, and the program is still active and running today. Indonesia has experienced major deforestation for several years due to land clearing for its growing palm oil industry. However, thanks to the Roundtable on Sustainable Palm Oil (RSPO), the palm oil industry is being revolutionized. The non-profit is certifying growers to become sustainable, and so far, the RSPO has globally certified over 66 growers and 2.3 hectares, accounting for about 20 percent of the world’s palm oil supply. Where there’s a will there’s a way, and these six unexpected countries are proving that. Do you want to learn more about the potential for solutions and change among many of the world’s other major emitters? Join former US Vice President Al Gore on December 5-6 for the global broadcast event 24 Hours of Reality: The Road Forward as we bring the planet together to fight the climate crisis and make a brighter future a reality. Buy a cool T-shirt or mug in the CleanTechnica store! Keep up to date with all the hottest cleantech news by subscribing to our (free) cleantech daily newsletter or weekly newsletter, or keep an eye on sector-specific news by getting our (also free) solar energy newsletter, electric vehicle newsletter, or wind energy newsletter.
Tizpar A.,Renewable Energy Organization of Iran |
Satkin M.,Renewable Energy Organization of Iran |
Roshan M.B.,Renewable Energy Organization of Iran |
Armoudli Y.,Renewable Energy Organization of Iran
Energy Conversion and Management | Year: 2014
In this paper, wind power potential of Mil-E Nader region is statistically analyzed based on 10 min measured short term wind data. Weibull parameters at 40 m height have been estimated and used to describe the distribution of wind data and its frequencies. Additionally, diurnal and monthly wind speed variations have been calculated. Based on power law model and average wind speed at three heights (10, 30 and 40 m), wind speeds at higher elevations have been extrapolated. Energy analysis has been carried out to find best hub height by comparing energy production of several wind turbines with different classes and hub heights. The energy production analysis showed that the wind turbines with 80 m height have high production in comparison to the others. © 2013 Published by Elsevier Ltd.