Towards a Sustainability Framework for Hydrogen Refuelling Stations: a Risk-based Multidisciplinary Approach

Sustainable hydrogen technology is becoming increasingly important as the world moves towards cleaner and more sustainable sources of energy. Hydrogen is a clean and versatile energy carrier that has the potential to play a critical role in the transition to a low-carbon economy. However, to realize this potential, significant technological advancements are needed in the production, storage, and distribution of hydrogen. To achieve these advancements, a multidisciplinary approach is required that involves technical, organizational, social, and economic factors. Sustainable hydrogen technology development is a complex and multifaceted process that requires the integration of various perspectives and expertise. A framework is needed to bring together these perspectives and develop a common approach to assessing risks and opportunities associated with hydrogen technology. This contribution proposes a framework addressing system modelling and analysis issues in clean hydrogen production and storage, with a focus on uncertainties that can impact social, economic, and environmental sustainability of hydrogen production and refueling facilities. By using risk-based performance and degradation models, the framework helps prevent and mitigate accidents and builds organizational safety culture and procedures while better communicating with the public. The framework also identifies optimal operational modes for increasing the feasibility of hydrogen refueling stations, ultimately leading to the development of more efficient, reliable, and lower-cost hydrogen-based technologies. The development of a common risk-based framework promotes sustainable hydrogen technology and identifies new opportunities for growth and collaboration. The framework is developed collaboratively through an international research network. By integrating multiple perspectives and disciplines, the framework can provide a roadmap for the development of sustainable hydrogen technology and create opportunities for future growth and development in the field

Technical and economic evaluation of freshwater production from a wind-powered small-scale seawater reverse osmosis system (WP-SWRO)

WOS: 000369458900006Wind-powered desalination is an attractive and sustainable method for providing potable water in isolated arid and coastal zones and islands. In this study, a techno-economic analysis of a wind-powered small-scale seawater reverse osmosis system (WP-SWRO) is presented. Levelised unit costs for electricity and water (LCOE and LCOW) were estimated for Gokceada Island, Turkey. The energy requirement of the system showed that water can be produced at a cost between US$2.962 and US$6.457 $/m(3) for all wind turbines (with rated capacities ranging from 6 kW to 30 kW) at various discount rates when considering off-grid operations. For a grid connected-wind turbine system, the levelised cost of water was predicted to be in the range from US$0.866 to US$2.846/m(3). The levelised costs of electricity are predicted to be US$0.077 to US$0.155/kWh for an 8% discount rate using a 30-kW wind turbine based on the turbine-specific cost. According to the results from an emission reduction analysis, using a 30-kW wind turbine for a reverse osmosis system permits a reduction of 80.028 tonnes of CO2 annually. The results show that wind-powered potable water production is economically and technically reasonable for the site. (C) 2015 Elsevier B.V. All rights reserved

Hydrogen generation from small-scale wind-powered electrolysis system in different power matching modes

WOS: 000283977100003This study presents a techno-economic evaluation on hydrogen generation from a small-scale wind-powered electrolysis system in different power matching modes. For the analysis, wind speed data, which measured as hourly time series in Kirklareli, Turkey, were used to predict the electrical energy and hydrogen produced by the wind hydrogen energy system and their variation according to the height of the wind turbine. The system considered in this study is primarily consisted of a 6 kW wind-energy conversion system and a 2 kW PEM electrolyzer. The calculation of energy production was made by means of the levelized cost method by considering two different systems that are the grid-independent system and the grid-integrated system. Annual production of electrical energy and hydrogen was calculated as 15,148.26 kWh/year and 102.37 kg/year, respectively. The highest hydrogen production is obtained in January. The analyses showed that both electrical energy and hydrogen production depend strongly on the hub height of wind turbine in addition to the economic indicators. In the grid-integrated system, the calculated levelized cost of hydrogen changes in the range of 0.3485-4.4849 US$/kg for 36 m hub height related to the specific turbine cost. The grid-integrated system can be considered as profitable when the excess electrical energy delivered by system sold to the grid. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved

Efficacy and Safety Data for Rituximab (Anti-CD20) in the Treatment of Pemphigus Vulgaris: A Retrospective, Single-Center Study

Objective: The aim of the study was to evaluate the efficacy and safety of rituximab treatment in patients with pemphigus vulgaris

Nekrobiosis Lipoidica in a Pediatric Patient

Necrobiosis lipoidica is a rare chronic granulomatous disease that has historically been associated with diabetes mellitus, but recently it is thought to be secondary to microangiopathic changes. We report a necrobiosis lipoidica case of a five-year-old girl with diabetes since the age of two, because it is exceptionally unusual in pediatric diabetes. Necrobiosis lipoidica should be considered in pediatric patients with slowly expanded erythematous plaques and patches. This will help protect the patient from other important diabetic microangiopathic complications, such as nepropathy and retinopathy and also malignant progression, such as squamous cell carcinoma

Determining the best model for estimation the monthly mean daily global solar radiation on a horizontal surface - A case study in Nigde, Turkey

WOS: 000218198200011Knowledge of the local solar radiation is important for many applications of solar energy systems. The global solar radiation on horizontal surface at the location of interest is the most critical input parameter employed in the design and prediction of the performance of solar energy systems. In this study, 3 empirical sunshine based models are compared correlating the monthly mean daily global solar radiation on a horizontal surface with monthly mean sunshine records for Nigde, Turkey. Models are compared using coefficient of determination (R-2), the root mean square error (RMSE), the mean bias error (MBE) and the t-statistic. According to our results, all the models fitted the data adequately and can be used to estimate the specific monthly global solar radiation. The t-statistic was used as the best indicator; this indicator depends on both, and is more effective for determining the model performance. The agreement between the estimated and the measured data were remarkable and the method was recommended for use in Nigde, Turkey