Sökresultat

As the future energy goals of the building industry involve reducing the energy intensity in buildings as well as increasing the share of renewable energy sources, a suitable approach would be energy renovating existing buildings and further utilizing renewable energy production technology to reach Net-Zero Energy Building (NZEB) standard. This study is therefore investigating the economic feasibi

Som ett resultat av ökad efterfrågan på elektricitet från urban elektrifiering, den växande ekonomin och global uppvärmning står Indonesien inför stora utmaningar. För att lyckas med hållbar storskalig elektrifiering krävs stora mängder litiumjonbatterier som kan balansera elnätet. Den ökande efterfrågan på dessa har lett till brist på batterimineraler vilket försvårar situationen för landet. Sa

Popular Abstract in English Heme is a small red-colored molecule consisting of an iron atom bound to a chemical structure called porphyrin. Heme is essential for many organisms, including humans, because it is a cofactor in a variety of proteins that are needed to sustain metabolism. The probably most famous heme protein is hemoglobin which gives blood its red color. The heme cofactor in hemoglobiHeme proteins form a large and diverse group of proteins which are involved in a variety of biological functions. The heme prosthetic group enables them to carry out redox reactions, transport electrons, bind gaseous molecules, and function as sensors. Despite their importance only little is generally known about heme protein biogenesis. The Gram-positive bacterium Enterococcus faecalis is found i

To reduce carbon emissions, logistics companies take measures to achieve the climate neutrality target to reach “Green Logistics.” As one of the valuable measures, gradually replacing present fossil fuel vehicles with electric vehicles for parcel delivery and linehaul transportation is scheduled at the terminals of logistics companies. The charging load of a fully electrified vehicle fleet challen

Sveriges framtida elsystem står inför en stor omställning, där kärnkraft successivt kommer att fasas ut, samtidigt som det sker en stor utbyggnad av vindkraft. Vindkraftens sjunkande priser, tillsammans med Sveriges mål om ett 100 % förnybart elsystem år 2040, gör det till en attraktiv resurs. En omställning från en leveranstrygg elproduktion baserad på kärnkraft, till en mer variabel med vindkrafSweden's future electricity system is facing a transformation, where nuclear power will gradually be phased out, while there is a large expansion of wind power. The declining wind power prices, together with Sweden's goal of a 100% renewable electricity system in 2040, makes it an attractive resource. However, a change from a secure supply of energy from nuclear production, to a more varia

Just nu pågår en omfattande global energiomställning mot en ökad andel förnybar energi för att minska koldioxidutsläppen och motverka de negativa klimatförändringarna. I denna energiomställning har grön vätgas pekats ut som en viktig pusselbit på grund dess potential till att minska koldioxidutsläppen enormt genom att användas i stora mängder inom bland annat stålindustri, jordbruk och transportse

Popular Abstract in English Fuel cells have been considered as alternative power source to petroleum oil. Especially, fuel cells have potentials to provide no pollutant emission (e.g., CO2, NOx, SOx) out of the power generation. For instance, once the fuel cells are installed instead of combustion engine in the cars used for commuting, transportation and leisure, the amount of pollutant emission cFuel cells are considered as a promising alternative environmentally benign power source to the existing ones depending on petroleum oil. Especially, proton-exchange membrane fuel cells (PEMFCs) have been intensively developed during the last decade because of their wide application windows including various portable, stationary and transportation applications. The market has been and will be main

Hybrid solutions that combine multiple renewable energy sources, such as solar power and hydro power, are gaining popularity as a means of meeting the growing energy demands while minimising environmental impacts, but also as an opportunity of connecting solar power plants to the grid in areas where this might not be possible unless large investments are made. This master thesis aims to evaluate t

The interest in self-consumption of PV electricity from grid-connected residential systems is increasing among PV system owners and in the scientific community. Self-consumption can be defined as the share of the total PV production directly consumed by the PV system owner. With decreased subsidies for PV electricity in several countries, increased self-consumption could raise the profit of PV sys

The transition towards renewable energy and electrification is expected to accelerate in the coming decades. This change is being studied by several actors, in Sweden most notably by Svenska kraft- nät, the Swedish TSO. They have recently constructed four different scenarios, two of which explore a future with a doubling of electricity consumption from year 2022 to year 2045. These two scenarios h

Framtidens energilagring banar väg åt förnyelsebar elenergi Andelen förnyelsebar elenergi på marknaden ökar ständigt. En negativ aspekt med dessa källor är att vi inte kan kontrollera när energin skall vara tillgänglig – vindkraften behöver vind och solkraften behöver strålande sol. För att överkomma dessa motsättningar och göra energin mer tillförlitlig behöver vind och solenergi kompletteras meIn this study, different membranes were tested for their use in a vanadium redox flow battery (VRB). The membranes were first tested under charge-discharge operation of the VRB over four charge-discharge cycles at different current densities (20 mAcm-2, 40 mA cm-2 and 60 mAcm-2) and the corresponding cell performance was evaluated in terms of total energy efficiency (EE), coulombic efficiency (CE)

Hur akviferlagers miljöpåverkan beskrivs i ansökningar och hur det påverkar tillstånd Akviferlager är den större och effektivare kusinen till jord- och bergvärme. Systemet använder sig av grundvattnet och ger både värme och kyla. Miljöriskerna är större än för enskilda villors jord- och bergvärme. Men hur väl utvärderas detta? Det finns ett hundratal akviferlager i Sverige som betjänar allt frå

In order to decrease the dependence on fossil fuels it is of paramount importance that renewable sources are used as effectively as possible. Therefore it is necessary to store excess energy when supply is higher than de-mand. One way to do so is by storing the energy as compressed air in a porous aquifer. The Lund Sandstone in the Kyrkheddinge area, Skåne, southern Sweden, has previously been inv

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

I takt med att andelen förnybar el ökar så ökar även efterfrågan på flexibilitet i elnätet. Flexibilitet behövs bland annat för att tillhandahålla frekvensreglering. Om elförbrukningen och elproduktionen tillfälligt är i obalans kommer frekvensen i elnätet att avvika från sitt börvärde. För att skydda mot dessa obalanser upphandlar Svenska Kraftnät flera olika frekvensregleringstjänster. Som ett rAs the penetration of variable renewable energy is increasing, the demand for flexibility in the electrical grid is on the rise. One way in which flexibility is needed is to provide frequency regulation. If electricity consumption and production momentarily are unbalanced there needs to. The Swedish TSO, Svenska Kraftnät, procures multiple different frequnecy regulation services to protect against