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The thesis comprises an analysis of the heat transfer phenomenon in solid oxide fuel cells (SOFCs) and a description of various transport phenomena in a solid oxide electrolysis cell. Both devices are encompassed under the solid oxide electrochemical cell concept. Moreover, a CFD model of an SOEC was developed to study the behavior of the cell under different conditions of operating and structural
In a bid to find ways to improve the use and management of electricity within the Swedish residential market, an investigation is being undertaken with the purpose of finding some of the individual factors of this consumption and what are the possibilities of its control. The electricity users within this study are all connected to their supplier via an automatic one-hour metering system that all
In many existing buildings, energy conservation measures have significantly reduced the demands for heat supply. In new buildings, advances in a wide range of technologies have led to even greater reductions. On the other hand, demands for electrical energy have risen noticeably. Unfortunately, it now seems that the use of both heat and electrical energy is starting to increase, especially in non
District heating systems using cogeneration, as well as local fuel-based and electric heating systems for detached houses, are analysed. The analysis includes the whole energy system, from the natural resource to the end user, with respect to primary energy use, emission and cost. The end-use technologies studied are heat pumps, resistance heaters and boilers. It was assumed that the base-load ele
Regional production and utilization of biomass in Sweden is analysed, considering the potential of replacing fossil fuels and producing new electricity. Extensive utilization of biomass will decrease biomass-transportation distances. The average distance for biomass transportation to a large-scale conversion plant suitable for electricity or methanol production will be 30–42 km when the conversion
Even though the design of buildings and technologies have been mainly focused on reducing energy use, there is still a discrepancy between predicted and actual energy saving due to user behavior. There is a need of understanding the behavior and relevant factors of using energy-efficient solutions. Energy-efficient solutions in an indoor environment can be defined as building characteristics such
The aim of this WaterWarmth project Work Package 6.1 report is to present a number of relevant frameworks available to analyse and/or assess the governance of current heating systems and future energy system innovation, in particular with a focus on aquathermal energy (AE) systems. At the basis of the report was a broad survey of the academic and other literature by project researchers on ways to
District heating (DH) is an efficient urban heating solution. Numerous external factors (energy efficiency, fuel-price increases, heat -pump competition and policy changes) are challenging. It is relevant to explore long-term cost-competitiveness of DH. A model has been developed testing three, future DH pathways: (i) phase out of biomass (aligned to the cascading principle of the EU Taxonomy), (i
We prove that for k ≫; 4√n regular resolution requires length nω(k) to establish that an ErdÅ's-Rényi graph with appropriately chosen edge density does not contain a k-clique. This lower bound is optimal up to the multiplicative constant in the exponent and also implies unconditional nω(k) lower bounds on running time for several state-of-the-art algorithms for finding maximum cliques in graphs.
Chemicals is the industrial sector with the highest energy demand, using a substantial share of global fossil energy and emitting increasing amounts of greenhouse gasses following rapid growth over the past 25 years. Emissions associated with energy use have increased with growth in coal-dependent regions but are also commonly underestimated in regions with higher shares of renewable energy. Renew
We prove that unary Sherali-Adams requires proofs of size nΩ(d) to rule out the existence of an nΘ(1)-clique in Erdős-Rényi random graphs whose maximum clique is of size d ≤ 2 log n. This lower bound is tight up to the multiplicative constant in the exponent. We obtain this result by introducing a technique inspired by pseudo-calibration which may be of independent interest. The technique involves
This paper explores how policy makers argue for the importance of digital competence in Swedish teacher education. A policy analysis of key policy documents from the government and from government-affiliated organisations from the time period 2011–2016 is conducted using Carol Bacchi’s ‘what’s the problem represented to be?’ approach. The paper critically examines underlying assumptions and partic
Allteftersom stora framsteg görs i datorernas värld och inom artificiell intelligens ser samhället en allt större implementering av artificiell intelligence-teknologi i människors vardag. En sådan implementering är autonoma, självkörande, fordon. Detta är en teknologi som lovar stora framsteg inom fordonssäkerhet, lägre utsläpp till följd av mindre köbildning och en rad andra samhällsvinster. Det
Mervärdeskatterätten utgör ett fullständigt harmoniserat område inom EU och medlemsstaternas lagstiftning på området är till sin helhet baserad på EU rätten. En uniform tillämpning av momsreglerna i medlemsstaterna är av stor vikt för mervärdesskattesystemets funktion. Skyldigheten att tolka nationell lag i enlighet med EU rätten är därför ett viktigt instrument för att säkerställa en uniform tillThe area of VAT constitutes a completely harmonized area within the EU and the national provisions in this area are to their entirety based on EU law. A uniform application of the VAT provisions throughout the EU therefore becomes essential in order to ensure the proper function of the VAT system. The obligation for national courts to interpret national law in conformity with EU law becomes an imp
