[en] We present studies of phase dynamics of the silicon rich part of the Fe-Si system performed with Moessbauer spectroscopy. Standard spectra are obtained in very pure samples and these are applied to the studies of commercial 75% ferrosilicon. We find that the semistable high temperature alpha phases, known for considerable concentration of vacancies, needs multiple quadrupole doublets to fit the data. Finally it is shown how the Moessbauer effect can be applied to quality control in ferrosilicon production. (orig.)

[en] The paper presents some new concepts of hydrogen production in Iceland for domestic use and export. A brief overview of the Icelandic energy consumption and available resources is given. The cost of producing hydrogen by electrolysis is calculated for various alternatives such as plant size, load factors and electricity cost. Comparison is made between the total cost of liquid hydrogen delivered to Europe from Iceland and from Northern America, showing that liquid hydrogen delivered to Europe from Iceland would be 9% less expensive. This assumes conventional technology. New technologies are suggested in the paper and different scenarios for geothermally assisted hydrogen production and liquefaction are discussed. It is estimated that the use of geothermal steam would lead to 19% lower hydrogen gas production costs. By analysing the Icelandic fishing fleet, a very large consumer of imported fuel, it is argued that a transition of fuel technology from oil to hydrogen may be a feasible future option for Iceland and a testing ground for changing fuel technology. (Author)

[en] Liquid hydrogen production costs (in Iceland), through conventional technology, are evaluated and compared to imported liquid hydrogen costs; european LH₂ would be 9% less expensive. New technologies are suggested and three different scenarios for geothermally assisted hydrogen production and liquefaction are discussed. Use of geothermal steam for liquefaction would lead to 20% lower liquefaction costs. By analysing the Icelandic fishing fleet, a very large consumer of imported fuel, it is argued that a transition of fuel technology from oil to hydrogen may be a feasible future option for Iceland. 4 figs., 6 refs

No abstract available

[en] Electrolysis at low temperature is currently used to produce Hydrogen. From a thermodynamic point of view, it is possible to improve the performance of electrolysis while functioning at high temperature (high temperature electrolysis: HTE). That makes it possible to reduce energy consumption but requires a part of the energy necessary for the dissociation of water to be in the form of thermal energy. A collaboration between France and Iceland aims at studying and then validating the possibilities of producing hydrogen with HTE coupled with a geothermal source. The influence of the exit temperature on the cost of energy consumption of the drilling well is detailed. To vaporize the water to the electrolyser, it should be possible to use the same technology currently used in the Icelandic geothermal context for producing electricity by using a steam turbine cycle. For heating the steam up to the temperature needed at the entrance of the electrolyser three kinds of heat exchangers could be used, according to specific temperature intervals