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Paraffin wax and various nanoparticles (CuO, Al2O3 and Fe3O4) were used as matrix and heat conduction enhancer of phase change materials (PCMs), respectively. The dispersant Span 80 was added into the nanocomposite to provide stable PCMs. Based on analyses of melting and freezing curves and infrared thermal imaging tests, the phase change latent heat, viscosity, and thermal conductivity of the nan

High efficiency, low total harmonic distortion (THD), and near-unity power factor are essential for low voltage battery charging systems to satisfy modern power quality requirements. In this study, an isolated totem-pole power factor correction (PFC) integrated buck converter has been designed and analyzed for low-voltage battery charging applications. The proposed topology combines a bridgeless t

How can participation inform bottom-up driven energy system transition? Broken Loop Current Situation • Dependence on fossil fuels • Creation of hazardous wastes • Dependence on not secure energy prices • Dependence on foreign country supply • High CO2 and other GHG emissions Marina Nart Program: MSc. in Environmental Studies and Sustainability Science (LUMES) Supervisors: Henner Bush and Bodil El

https://www.graduateschool.sam.lu.se/sites/graduateschool.sam.lu.se/files/marina_poster-1.pdf - 2026-06-26

The development of the renewable energy sources and the amount installations in Sweden and also in other countries have increased a lot the last years, this is especially true for solar- and wind power. Main reason for the increase of the renewable energy sources is to decrease the usage of fossil fuels and thus to decrease the impact on the climate. The integration of the renewable energy sources

Power systems operate at a specific frequency and constantly require a balance between production and consumption of electricity in order to maintain the frequency within a certain interval. Larger frequency deviations can cause blackouts or damage equipment connected to the grid. Balancing functions that stabilise the grid are referred to as \textit{ancillary services}, which in Sweden include th

Batterilager i elnätet blir vanligare och större, till den grad att det är aktuellt med direk- tanslutning till transmissionsnätet. Som en del av elektrifieringen kan batterier spela en viktig roll för nätets stabilitet − de kan snabbt och exakt leverera mycket effekt, både in i och ut ur nätet. Detta gör dem särskilt lämpade för snabba reserver, såsom FCR-D och FFR. I varje punkt i elnätet finns

We use energy in almost every aspect of our lives. Yet, often, we do not know the source of electricity that powers our homes or heats our food. In this episode, we explore energy communities as a form of decentralised and democratic energy production. Community energy sees people coming together to take control of their energy needs, by finding alternative ways to organise and govern the energy sWe use energy in almost every aspect of our lives. Yet, often, we do not know the source of electricity that powers our homes or heats our food. In this episode, we explore energy communities as a form of decentralised and democratic energy production. Community energy sees people coming together to take control of their energy needs, by finding alternative ways to organise and govern the energy s

Weakly coupled relaxors based on compositions (1-x) BaTiO 3 -xBiMeO 3 , where Me is a metal ion, have attracted at