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A three-dimensional, non-isothermal and two-phase flow model for proton exchange membrane (PEM) fuel cells is developed. In the cathode catalyst layer, a spherical agglomerate model with consideration of catalyst layer structure and liquid water effect is applied to determine the electrochemical kinetics. The size and structure of the agglomerates are determined by the following parameters, i.e.,

A polymer electrolyte fuel cell (PEFC) produces electrical energy according to the electrochemical reactions carried out inside the cell. During the energy conversion, water molecules are also produced at the cathode side, which affects the gas diffusion layer (GDL) diffusion parameters. The generated water-drops from the reaction may give partial or total blockage of the reactant gases and also m

With the increased concern about energy security, air pollution and global warming, the possibility of using polymer electrolyte fuel cells (PEFCs) in future sustainable and renewable energy systems has achieved considerable momentum. A computational fluid dynamic model describing a straight channel, relevant for water removal inside a PEFC, is devised. A volume of fluid (VOF) approach is employed

Electrification usually implies more than just swapping fuels or components and must be studied at a system level to ensure reliable, robust and resilient operation. Renewable electricity appears as the most promising alternative to replace fossil fuels in most applications in order to reduce GHG emissions. Moreover, it constitutes a virtually unlimited resource that is present in some form almost

https://www.iea.lth.se/en/research/electrification - 2026-06-19

Senior lecturer Contact details Email: jens [dot] uhlig [at] chem [dot] lu [dot] se Phone: +46 46 222 77 20Organisation Chemical Physics Service point: 1 WebpageJens Uhligs profile in Lund University research portalOther affiliations Member of Strategic Research Area NanoLund: Centre for Nanoscience Profile area member Lund Laser Centre, LLC Profile area member LTH Profile Area: Nanoscience and Se

https://www.chemphys.lu.se/jens-uhlig - 2026-06-20

Professor Contact details Email: anders [dot] irback [at] mgeo [dot] lu [dot] seOrganisation Department of Earth and Environmental Sciences (MGeo) Service point: 16 WebpageAnders Irbäcks profile in Lund University research portalOther affiliations Assistant director Centre for Environmental and Climate Science (CEC) Manager Centre for Environmental and Climate Science (CEC) Assistant head of depar

https://www.cec.lu.se/anders-irback - 2026-06-20

This thesis evaluates the ability of three hand-calculation models for estimating overpressure from hydrogen vapour cloud explosions. The models were the TNT, TNO and OHVE models. The aim was to assess their performance in realistic release environments and identify their strengths and limitations. Model predictions were validated against experimental data from three experimental setups: a refuell

The steel and chemical production industries are the largest industrial emitters of greenhouse gases in the European Union, together accounting for half of the EU’s industrial greenhouse gas (GHG) emissions. A promising strategy for achieving deep GHG emissions reductions is the electrification of these two industries, which would depend on the rapid expansion of renewable electricity supply. Such

Öresundskraft – A bright internship NGEA51, January 20 – March 20 2020 Isabell Plars At the start of 2020, I did an internship at Öresundskraft in Helsingborg. Öresundskraft is an energy company owned by the city of Helsingborg. The purpose of Öresundskraft is to supply the citizens of Helsingborg with energy in the form of both electricity and heat. Öresundskraft is also involved in a lot of inno

https://www.nateko.lu.se/sv/sites/nateko.lu.se.sv/files/oresundskraft_2020.pdf - 2026-06-21

Growing concerns about climate change and depleting fossil feedstocks are driving a shift within the chemical industry from energy-intensive processes to more environmentally sound and sustainable processing using renewable feedstocks. One such process is the utilization of lipases for the chemo-enzymatic epoxidation of vegetable oils and fatty acids. The lipase mediated route for production of fa

The catalytic copper site in nitrite reductase contains a Cu2+ ion bound to three histidine (His) ligands and a solvent molecule. Sites from various sources show a conspicuous variation in the structure. In some proteins, it is close to tetrahedral (even more so than are blue copper proteins), whereas in other proteins, it has a structure more similar to that expected for a type 2 copper site. We

This paper presents a study of the pH dependence of the activity and stability of a set of family 11 xylanases for which X-ray structures are available, using the PROPKA approach. The xylanases are traditionally divided into basic and acidic xylanases, depending on whether the catalytic acid is hydrogen bonded to an Asn or Asp residue. Using X-ray structures, the predicted pH values of optimal act

Concerns about energy-related emissions and energy dependence and security while also achieving the SDGs are fuelling the rising interest in socio-technical transitions towards more sustainable energy systems. Community energy projects have been proposed as a tool for this transition to renewable energy, but little is known about its potential to foster the wider transformation of the energy syste

We present the results of the commissioning of a 28-pole 2 T Hybrid Wiggler at the electron storage ring of the Brazilian Synchrotron Light National Laboratory (LNLS). The wiggler will be used mainly for protein crystallography and was optimized for the production of 12 keV photons. We describe the effects of the insertion device on the storage ring lattice, such as the correction of the linear tu

The plasma–surface interface has sparked interest due to its potential of creating alternative reaction pathways not available in typical gas–surface reactions. Currently, there are a limited number of in situ studies investigating the plasma–surface interface, restricting the development of its application. Here, we report the use of in situ ambient pressure X-ray photoelectron spectroscopy in ta

INTRODUCTIONBoreal forests are crucial for mitigating global climate change by capturing and storing large amounts of atmospheric carbon dioxide. However, previously unmanaged primary boreal forests are being rapidly transformed to managed secondary forests to meet the rising global demand for materials and energy. Understanding the effects of boreal primary to managed secondary forest transformat

Earlier work has derived the storage complexity of the bounded distance decoder (BDD) for binary-channel convolutional codes. We extend this work to the Gaussian noise channel and to partial-response codes. We show that the storage requirement similar to(2(1-R) - 1)(-t) paths for rate-R convolutional codes over the binary channel becomes similar to2(2Rt) over the Gaussian channel, where the decode

The majority of the power production in the world today is based on combustion of coal, oil and natural gas. Most countries have agreed that the amount of CO2 emitted to the atmosphere will have to be decreased to keep the global warming at sustainable levels. One way of reducing the CO2 emitted to the atmosphere is by introducing hydrogen co-firing. The hydrogen may be produced from renewable sou