Hydrogen - A sustainable energy carrier
Abstract Hydrogen may play a key role in a future sustainable energy system as a carrier of renewable energy to replace hydrocarbons. This review describes the fundamental physical and chemical properties of hydrogen and basic theories of hydrogen sorption reactions, followed by the emphasis on state-of-the-art of the hydrogen storage properties of selected interstitial metallic hydrides and magnesium hydride, especially for stationary energy storage related utilizations. Finally, new perspectives for utilization of metal hydrides in other applications will be reviewed.
Abstract In Denmark solar fractions up to about 50% are seen for large scale solar district heating systems. The feasibility of higher solar fractions has been investigated in a case study. There is no direct subsidy for solar heating in Denmark, but the taxes on the alternative (fuels) affects the feasibility of solar heating for any district heating plant. The results show that solar heat can be provided at competitive costs compared to what is seen at many Danish district heating plants. The utility in the case study has not yet decided on a solar district heating system size.