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Sammanfattning Detta arbete har delats in i två delar. Den första delen handlar om olika energilagringstekniker. Den andra delen handlar om att lagra egenproducerad elenergi i ett flerbostadshus. Syftet med första delen har varit att samla information om olika energilagringstekniker i en kunskapssammanställning genom att studera dess funktion, aktuella status och framtidsutsikter. Den andra delen

The incineration furnace at National Veterinary Institute (SVA) in Uppsala, Sweden, generates a large amount of waste heat. Some of this heat is partially recovered and is used for heating one of the main buildings during the furnace operation. However, around 2,000 MWh is wasted annually due to unavailability of any storage system. This work studies in detail four different solutions to utilize t

Bananas are widely consumed fruits with over 140 metric tons produced annually. As much as 336 metric tons of banana pseudo-stems, sheaths, piths, peels and leaves are produced annually. These wastes are usually discarded via composting, aerobic decomposition, incinerated or simply allowed to rot in the fields. However, these treatments may cause serious environmental and ecological problems. Mea

Med ökad andel intermittent elproduktion i Sveriges elproduktionsmix och ett åldrande stamnät ökar behovet av flexibilitet i elsystemet. Lagring av energi, till exempel i vätgas, är ett exempel på en sådan flexibilitetslösning, eftersom energin kan flyttas från tidpunkter med överskott till tidpunkter med högt energibehov. Syftet med examensarbetet är att undersöka energisystemnyttan med ett v äga

Tuning the spectral and directional characteristics of thermal emission is critical for advancing technologies such as thermophotovoltaics (TPVs), passive thermal radiative cooling (PTRC), and solar thermophotovoltaics (STPVs), yet scalable fabrication methods remain limited. Here, femtosecond laser surface processing (FLSP), a top-down ablation and re-solidification approach is employed, to creat

Runt om i världen pågår en omställning av energisystem på internationell, nationell och regional nivå av en omfattning som inte noterats på många årtionden. Omställningen innebär i första hand en övergång från fossila, icke förnybara energikällor till fossilfria, förnybara sådana med huvudsakligt syfte att begränsa de antropologiska klimatförändringarna och andra negativa effekter på miljön. Den fAll around the world, energy systems are transforming at the international, national and regional level and at a rate not seen for many decades. This transformation primarily involves a transition away from fossil, non-renewable energy sources and to fossil-free, renewable ones with the primary purpose of halting the process of anthropological climate change and limiting other adverse effects on t

The proliferation of renewable energy resources is imposing demands on electric distribution infrastructure that traditional low-frequency transformers are not equipped to fulfill. Conventional transformers operate with high energy efficiency but offer zero active controllability with no inherent power quality management and support for hybrid power flows. The solid state transformer (SST), a powe

Vätgas har potential i ett energilagringssystem eftersom det är en energibärare som är väldigt energirik och kan lagras i stor skala. Vätgas kan produceras enkelt via elektrolys av vatten och lagras i stora mängd under högt tryck, vid behov kan vätgasen sedan brännas i en kraftverksprocess och generera elektricitet. Då förbränning av vätgas med syrgas enbart bildar vattenånga kan ett förnybart ene

In the context of a decarbonized future where stringent carbon dioxide (CO2) emissions constraints are imposed on vehicles, hydrogen emerges as a promising solution to address emissions directly at the point of use. This chapter explores the potential of using hydrogen to power vehicles, particularly in the context of heavy-duty (HD) internal combustion engine (ICE) applications. Hydrogen vehicles

This paper presents a new analytical solution for the influence of regional groundwater flow on the performance of borehole heat exchangers. The solution concerns a vertical borehole. The transient thermal response for the fundamental case of a step-change in heat injection rate is given. The solution is remarkably simple and the formulas quite handy considering the complexity of the convective-di

ADVANCING SUSTAINABLE SOLUTIONS 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

https://www.iiiee.lu.se/media-press/podcast-advancing-sustainable-solutions/podcast-episode-guide/energy-communities-transition-towards-more-just-energy-system - 2026-06-03

I takt med att världen blir mer medveten om hur människans beteende påverkar jordens klimat, ställs också högre miljömål. Ett hållbart energisystem är en del av dessa miljömål och att övergå till enbart förnybara energikällor är ett verktyg för att uppnå dessa. Övergången till endast förnybara energikällor riskerar dock att medföra problem, bland annat så kallad effektbrist. Effektbrist är inget nAs the world becomes more aware of how human behavior affects the earth’s climate, higher environmental goals are also set. A sustainable energy system is one part of these environmental goals, and switching to only renewable energy is a tool to reach such goals. However, a system with only renewable energy can be vulnerable at time periods of reduced production of electricity, with a subsequent r

En sammanställning av större geoenergianläggningar i Sverige har i samband med detta arbete gjorts. Arton anläggningar med bergvärme, borrhålslager, högtemperaturlager samt akfiverlager ingår i denna. Utifrån information om dessa anläggningars drift har rekommendationer för mätpunkter getts för att bättre säkra mätning och driftuppföljning. Geoenergi är Sveriges tredje största förnybara energikällShallow geothermal energy is the third biggest renewable source of energy in Sweden. Low-temperature energy stored in the ground and groundwater is collected by a ground heat exchanger with circulating brine and a ground source heat pump, GSHP. It is possible to extract both heating energy and cooling energy in these systems; in the winter the earth is utilised as a heat source, and in the summer

This thesis tries to answer the question of how to properly trade on an intermittent market using a theoretical storage and estimates attainable profit of such a setup. This have been done through evaluating different storage alternatives, analyzing market trends, investigating associated costs for the operation and simulating possible outcomes. Trading with certain rules, an algorithm has been de

Electric power grids have a limited capacity for safe and reliable transfer of power. Due to the ongoing large-scale expansion of variable renewable energy sources, such as wind and solar, there is a growing need for rapid gridcapacity increase.This thesis explores methods for improving and expanding grid capacity through control of converter-interfaced energy resources, including wind and solar pElectric power grids have a limited capacity for safe and reliable transfer of power. Due to the ongoing large-scale expansion of variable renewable energy sources, such as wind and solar, there is a growing need for rapid gridcapacity increase.This thesis explores methods for improving and expanding grid capacity through control of converter-interfaced energy resources, including wind and solar p