The use of hydrogen storage enables long term energy storage in hybrid wind-fuel cell energy system. The aim of this research is to study the feasibility of a wind-hydrogen energy system that produces electricity to households,health post, grinding facility, schools and water pumps in rural areas. The system consists mainly of wind turbines, fuel cells, electrolyzers and hydrogen tanks. The wind resource in the country was studied after selecting five representative cities that are geographically different. These are Addis Ababa, Nazareth, Mekelle, Debre Brehan and Dire Dawa.The system The best system is chosen for each location based on net present cost(NPC) and detail analysis of system performance. The results indicate that the system enables high renewable fraction with up to 8 days of energy autonomy only at moderate increase in NPC over a wind-diesel-battery system.
Nowadays clean and renewable energy supply is one of the biggest challenges for the mankind. Hydrogen is often proposed as a prospective fuel of the future, but there are numerous scientific and technological problems to be solved on the way to the hydrogen economy. One of them is hydrogen production. The most efficient way of hydrogen production would be direct water splitting using solar energy. Photoelectrode materials for solar water splitting cells must fulfill a number of requirements: an appropriate band gap, band edge positions, high specific surface area, long term chemical and mechanical stability, low cost of fabrication. In this work, porous thin film electrodes for photoelectochemical solar water splitting were developed by the dealloying approach. The search for materials with optimal physical and photoelectrochemical properties inevitably involves fabrication and characterization of a large number of samples. In order to accelerate this search, combinatorial and high-throughput methods were used for fabrication and investigation of the thin film materials libraries.
Hydrogen and fuel cell technologies are breaking technologies, potentially penetrating in every segment of social life. It is therefore of paramount importance to understand when and how particular society will face the necessity to trigger the process of implementing these technologies. This is connected with the maturity of particular society. Under the term maturity one can understand the fulfillment of all the necessary conditions for such quantum leap to happen. Finding the correlation between socio-economic indicators, describing the society development level and the ability of this society to implement the new technology, is one way to do this. If such a correlation exists, it would enable one to predict the time window in which particular society should start implementing the new technology. Content of the book is based on the MSc thesis which was supervised by Dr. Stanko Hocevar. This book is written for governments and decision maker who would like to begin with implementation of hydrogen technology and to find the appropriate timing of introducing the regulation and standards framework.
Hydrogen Peroxide Teeth Whitening Strips Double Elastic Gel Strips