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1
Content available remote Superconducting properties of YBCO coated conductors produced by inkjet printing
EN
Current methods of producing YBa2Cu3O7-[delta] coated conductors (YBCO CC) require expensive processing. A new technology combining chemical solution deposition (TFA-MOD) with inkjet printing, demonstrated successfully in this paper as confirmed by Hall probe magnetometry, shows considerable potential as a cost-effective replacement. The flexible control of ink stoichiometry and rheology, and the ease of introducing additions, offered by CSD inkjet printing has the potential to reduce the strong Ic anisotropy of YBCO CCs revealed by goniometric Ic measurements.
PL
Nowa technologia produkcji nadprzewodzących taśm YBa2Cu3O7-[delta], łącząca procedurę chemicznej depozycji roztworu za pomocą drukowania, ma szansę zastąpić obecne, kosztowne metody produkcji. Pomiar magnetometryczny czujnikiem Halla potwierdził nadprzewodnictwo próbki YBCO otrzymanej wyżej wymienioną metodą, która umożliwia łatwą kontrolę stechiometrii i reologii roztworu, a także wprowadzanie dodatkowych komponentów, mających na celu redukcję silnej anizotropii Ic w filmach YBCO, ukazanej przez pomiar goniometryczny.
2
EN
The paper deals with an improved concept of the superconducting (HTS) magnetic bearing. This new solution depends on the application of additional permanent magnet rings placed below the bulk superconductors connected with the rotor. Calculations and measurements of the levitation force between the magnetized HTS and a coaxial MgB2 hollow cylinder are reviewed, proving the validity of the concept of such a superconducting bearing.
PL
W pracy zaprezentowano zmodyfikowaną wersję nadprzewodnikowego (HTS) łożyska magnetycznego. To nowatorskie rozwiązanie polega na zastosowaniu dodatkowych pierścieni z magnesów trwałych umieszczonych poniżej masywnych nadprzewodników wysokotemperaturowych umocowanych do wirnika. Przedstawione w pracy obliczenia oraz wyniki pomiarów sił lewitacji pomiędzy namagnesowanym HTS a cylindrem z MgB2, potwierdzają zalety zaproponowanego rozwiązania.
EN
Integration of advanced electrical machines with electrical power systems and renewable energy is at the heart of the dedicated Liquid Hydrogen Laboratory (LHL) at the University of Cambridge. Generation, storage and use of the hydrogen in conjunction with a patented dynamic energy storage system are an integral part of the proposed combined heat and power (CHP) IEIM Project. The aim of the project is to address intelligent energy infrastructure management IEIM of a smart micro grid, which combines hydrogen and electricity. To build a powerful relational database for the entire physical infrastructure based on combined heat and power elements, a sub-system needs to be established to monitor the status of interconnectivity to the grid. This information will be mapped onto the database to provide a real-time view of the energy network's physical interconnectivity with the grid, significantly reducing the environmental impact of the total electricity supply system. Considering the nature of the heat and power elements fibre optic based sensing techniques will remotely monitor the patching fields and provide an accurate map of the connectivity and constantly monitor changes in real-time.
4
Content available remote Sustainable LH2 energy cycle
EN
Hydrogen energy cycle in a decentralized economy is a subject of discussion and research effort to find justification for usage of liquid hydrogen in conjunction with SOFC and SOEC and superconducting energy storage devices. The renewable energy sources are envisage to provide electricity to split water to H2and O2 using high temperature electrolysis which can be beneficial thanks to the decrease of the energy demand due to the thermodynamics and improved electrochemical kinetics. Additionally O2 and H2 can be effective cryogenic liquids with boiling temperatures of 55K (under lower pressure) and 20K respectively. It is proposed that both gases O2 and H2 can be used in conjunction with recently developed mix gas cryocooler working at very low pressure and providing refrigeration at temperature below inversion temperature of hydrogen (118K). Liquefied hydrogen at temperature of 20K is a very efficient coolant for high temperature superconducting energy storage devices such flywheel and even SMES made from MgB2. The H2 and O2 can be used in SOFC or PFC generating electricity when it is needed. The fact that SOFC is exothermic and SOEC is endothermic, enable realisation of the thermally balanced heat and electricity cycle. It was concluded that combination of the balanced SOFC/SOEC stacks in conjunction with liquefaction of the H2 and O2 products makes the overall LH2energy cycle sustainable and applicable to other modern energy storage devices such as superconducting flywheel.
5
Content available remote Hydrogen as a fuel and as a coolant - from the superconductivity perspective
EN
Superconductors have a great potential in the future development of transportation and energy supply applications. Although MgB2 superconductors that operate at liquid hydrogen temperatures are not yet commercially available, research indicates that these will be feasible in the future. Novel concepts for transportation and energy supply that would be possible using medium temperature MgB2 superconductors include the non-polluting 'cryoplane', a self contained full electric superconducting ship, and cheaper superconducting MgB2 magnets for the fusion, small energy storage and possibly magnetic resonance imaging (MRI) systems. Superconducting conductors based on magnesium borides have been developed in Cambridge that can be fabricated into cables for power transport with minimal losses. Development of liquid hydrogen cooled MgB2 superconducting DC cables are also under consideration. Hydrogen used as a coolant, as well as an energy carrier, may spin off new research and developments in superconducting materials and efficient energy use.
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