Original Article
Solar Thermal Engineering
Mahdi Rezaei Rad; Rouzbeh Shafaghat; Amirhossein Aghajani afghan; Behrad Alizadeh Kharkeshi
Abstract
This experimental study introduces a solar humidifier-dehumidifier desalination model as a type of open-air-open water (OAOW) system; also, a new condenser with thermoelectric modules is applied in the dehumidifier unit. The experimental tests were done by considering climate conditions in the north ...
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This experimental study introduces a solar humidifier-dehumidifier desalination model as a type of open-air-open water (OAOW) system; also, a new condenser with thermoelectric modules is applied in the dehumidifier unit. The experimental tests were done by considering climate conditions in the north of Iran (Mazandaran province, Babol), and the effect of the inlet air's temperature and flow rate on the system's functional characteristics and condenser was investigated to improve the performance. Sensors measured the data related to the fluid temperature and humidity of the cycle at different points; other data was also gathered by psychrometric chart and EES software. The results section investigates water generation rate, GOR, coefficient of performance (COP), and condenser efficiency. The results showed that the highest water production is 420 g/hr, and the highest GOR is 0.19. Also, the water production rate and COP increase as the inlet air temperature rises. At temperatures lower than 75o Celsius, due to the air saturation, the maximum point of the water production and COP occurs at a flow rate of 0.022 kg/s. at high temperatures, increasing the flow rate raises water production, and on the other hand, the COP in the condenser is 0.8 at the highest point. According to the economic analysis done for the proposed model, the freshwater cost is 0.098-0.049 $/year for one liter.
Original Article
Mojtaba Ghiyasi
Abstract
Data envelopment analysis (DEA) is a mathematical programming approach for the performance basement of the production units from a production economic view. In this paper, we analyze the performance of Iranian wind power plants (IWPP) using DEA. In the second phase of the study, we utilize the inverse ...
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Data envelopment analysis (DEA) is a mathematical programming approach for the performance basement of the production units from a production economic view. In this paper, we analyze the performance of Iranian wind power plants (IWPP) using DEA. In the second phase of the study, we utilize the inverse DEA approach as a valuable method for the future planning of the IWPPs. In this step, we considered five different scenarios from a short-run up to a long-run planning for electricity production by renewable energy. In the short-run we just need more capacity factor rather than capital. Although in the mid-run we did not presume capital extension, the result suggested this. In the end, in the long-run planning extension in not only capacity factor but also more investment in the higher technologies is a requirement for reaching the desired electricity production.
Original Article
Tide, Wave and Hydro Power
Hosein Jokar; Abuzar Abazari; Reza Dorostkar
Abstract
One of the main needs for dhow vessels is fuel for diesel generators that generate electricity, which in turn is used in refrigerators and electronic devices. Concerning the development of new devices for electricity generation such as point absorber wave energy converters, in the present research for ...
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One of the main needs for dhow vessels is fuel for diesel generators that generate electricity, which in turn is used in refrigerators and electronic devices. Concerning the development of new devices for electricity generation such as point absorber wave energy converters, in the present research for the first time, the feasibility of installing such converters on the hull of the dhow vessel and their performance is being examined. These WECs expanded on the sea-free surface level during anchoring time. Depending on the relative angular displacement between the WEC and the dhow hull the electricity is produced. In the present study, the simulations are done based on the diffraction theory in Ansys AQWA. The results showed that for considering four installed WECs, the maximum output power of 400 kilowatts is produced, which is an acceptable amount of energy for supplying the common electronic devices on the dhow vessel. In addition to this, it has been shown that the hybrid system of the dhow and WECs in the anchoring mode has fewer dynamic responses compared to a single dhow without WECs. Such conditions can be utilized for the comfort of the passengers or special operations during the anchoring time. It was also observed that the buoy size does not have a considerable effect on the production power and dynamic response of the platform, while the length of 2 m for the lever and angle of 90 degrees of the incident wave is optimum from the production power point of view.
Original Article
Solar Thermal Engineering
Fatemeh - Ahani; Elham - Sarkardehi; Maryam - Ansarimanesh; Hamed - Moslehi
Abstract
Approximately 40% of fossil energy consumption in Iran is attributed to office and residential buildings. Therefore, optimizing energy consumption and managing energy demand in these buildings is essential. A key aspect of this optimization is the building's outer shell, which plays a vital role ...
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Approximately 40% of fossil energy consumption in Iran is attributed to office and residential buildings. Therefore, optimizing energy consumption and managing energy demand in these buildings is essential. A key aspect of this optimization is the building's outer shell, which plays a vital role in heat control. One effective method for reducing energy consumption in buildings is the implementation of double-skin facades (DSFs), which have demonstrated superior performance compared to single-skin facades. Considering the high energy consumption of office buildings in Iran, this research aimed to minimize energy use in the computer center building at Shahrood University of Technology. The research methodology consisted of a literature review, field measurements, and simulation. The validity of the research data was evaluated against field measurements, and its accuracy was confirmed. Using Design Builder version 7 simulation software, twelve models of double-skin facades were analyzed and categorized into box window facades and shaft boxes, both located on the southern elevation of the computer center building. The results indicate that the double-skin facade featuring a box window reduces the building's energy consumption by 6.4% to 9.7% compared to the single-skin facade. Additionally, the double-skin facade of the shaft box also decreases energy consumption, ranging from 5.5% to 9.3% compared to the single-skin facade.
Original Article
Energy Policy
Hossein Heirani; Seyed Mohammad Shobeiry
Abstract
This paper analyzes the life cycle of Iran's wind energy innovation system through a co-evolutionary framework that examines the interplay between the system and its contextual environment. Our analysis reveals that the system is transitioning from formation to growth, but remains vulnerable due ...
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This paper analyzes the life cycle of Iran's wind energy innovation system through a co-evolutionary framework that examines the interplay between the system and its contextual environment. Our analysis reveals that the system is transitioning from formation to growth, but remains vulnerable due to its high dependence on contextual factors. By examining three historical phases, we demonstrate how political, geographical, and sectoral contexts have critically influenced the system's development trajectory. The research identifies key systemic problems across functional, structural, and contextual dimensions, showing how their dynamics have either facilitated or hindered growth. Based on these findings, we propose policy recommendations focused on infrastructure stabilization, institutional support, and contextual management to overcome barriers and enhance the system's resilience and performance. This co-evolutionary perspective offers policymakers a novel framework for understanding and addressing the complex challenges facing renewable energy innovation systems.
Original Article
Electricity Generation by Green Energy Sources
Kaveh Soleimani; Ataollah Gharechae; Mohammad Javad Ketabdari
Abstract
This research evaluates the feasibility of utilizing wave energy at Chabahar Port as an alternative power source. The first part of the study analyzed seasonal and annual wind and wave characteristics, as well as the directional distributions of winds and waves, utilizing long-term buoy measurements. ...
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This research evaluates the feasibility of utilizing wave energy at Chabahar Port as an alternative power source. The first part of the study analyzed seasonal and annual wind and wave characteristics, as well as the directional distributions of winds and waves, utilizing long-term buoy measurements. The extractable power output was determined based on the wave scatter diagram for Chabahar Port and the power matrix of various existing wave power devices. The average annual wave power at this location is 4.1 kW/m. However, wave power exhibited significant variation across the autumn, winter, spring, and summer seasons, averaging 1.46, 1.48, 4.4, and 6.94 kW/m, respectively. Among the thirteen wave power concepts evaluated, the Wave Dragon and the 1500 kW Pelamis demonstrated the best performance. The Wave Dragon is identified as the preferred wave power device for Chabahar Port, considering its power production capability, seabed compatibility, and adaptability to diverse meteorological conditions. Additionally, RETScreen Expert software was employed to conduct a cost and emissions analysis, indicating that the Wave Dragon and Pelamis can reduce greenhouse gas emissions by 719.7 and 351.6 tons of carbon dioxide, respectively. Consequently, the Wave Dragon offers the most economical power solution for Chabahar Port, with a greater reduction in greenhouse gas emissions.
Original Article
Energy Policy
Seyed Zaman Hosseini; Farhad Hossinzadeh Lotfi; Mahnaz Ahadzadeh Namin
Abstract
Assessment of progress and regression of organizations is necessary to determine their performance and determination of the efficacy of managerial decisions, supply usage, and weak and strong points for the senior managers and decision-makers. They can improve the efficiency of the units based on this ...
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Assessment of progress and regression of organizations is necessary to determine their performance and determination of the efficacy of managerial decisions, supply usage, and weak and strong points for the senior managers and decision-makers. They can improve the efficiency of the units based on this assessment. In this paper, using data envelopment analysis, the performance of regional electric companies of Iran in 2015 and 2016 is assessed. Because of semi-positive and negative indexes, the Slack-Based Measure (SBM) model of efficiency is developed for the 16 regional electric companies of Iran. To determine progress and regression in 2016 compared with 2015, models are proposed to compute the indexes of productivity. Finally, solving the proposed models, the Malmquist productivity index is computed for regional electric companies of Iran with 18 input, intermediate and output indexes and considering the amount of production of renewable energies as one of the important output indexes because of the irrefutable necessity of this kind of energies in the world. Their progress and regression are obtained using the Gams software showing progress in two companies, and regression in 13 companies while one company had neither progress nor regression. Studies performed show that agility of the organizational structure, financial and human resource limitations, sanctions and imbalance between the actual price of production of one kilowatt-hour of electricity and its sale price are most effective factors on the progress and regression of the companies.