Blar i Institutt for energi og prosessteknikk på tidsskrift "International journal of hydrogen energy"
Viser treff 1-20 av 20
-
Cold flow characteristics of a novel bluff body hydrogen burner
(Journal article; Peer reviewed, 2018)The cold flow characteristics of a novel partial premixed bluff body (PPBB) low NOx burner, capable of operating with hydrogen as well as methane-hydrogen blends, were investigated numerically. The PPBB burner features a ... -
Comparing exergy losses and evaluating the potential of catalyst-filled plate-fin and spiral-wound heat exchangers in a large-scale Claude hydrogen liquefaction process
(Peer reviewed; Journal article, 2020)Detailed heat exchanger designs are determined by matching intermediate temperatures in a large-scale Claude refrigeration process for liquefaction of hydrogen with a capacity of 125 tons/day. A comparison is made of ... -
Dissecting the exergy balance of a hydrogen liquefier: Analysis of a scaled-up claude hydrogen liquefier with mixed refrigerant pre-cooling
(Peer reviewed; Journal article, 2020)For liquid hydrogen (LH2) to become an energy carrier in energy commodity markets at scales comparable to for instance LNG, liquefier capacities must be scaled up several orders of magnitude. While state-of-the-art liquefiers ... -
Economic assessment of membrane-assisted autothermal reforming for cost effective hydrogen production with CO 2 capture
(Journal article; Peer reviewed, 2019)A recent techno-economic study (Spallina et al., Energy Conversion and Management 120: p. 257–273) showed that the membrane assisted chemical looping reforming (MA-CLR) technology can produce H2 with integrated CO2 capture ... -
Effect of anion exchange ionomer content on electrode performance in AEM water electrolysis
(Journal article; Peer reviewed, 2020)Anion exchange membrane water electrolysis (AEMWE) has acquired substantial consideration as a cost-effective hydrogen production technology. The anion ionomer content in the catalyst layers during hydrogen and oxygen ... -
Gas Switching Reforming for syngas production with iron-based oxygen carrier-the performance under pressurized conditions
(Journal article; Peer reviewed, 2019)A four-stage Gas Switching Reforming for syngas production with integrated CO2 capture using an iron-based oxygen carrier was investigated in this study. The oxygen carrier was first reduced using dry methane, where high ... -
Graphene Modified Fluorinated Cation-Exchange Membranes for Proton Exchange Membrane Water Electrolysis
(Journal article; Peer reviewed, 2019)One of major current technical challenges in proton exchange membrane water electrolysis (PEMWE) is the limited proton conductivity. Nowadays, graphene is considered one of the most promising candidates for improving the ... -
Highly active porous Co–B nanoalloy synthesized on liquid-gas interface for hydrolysis of sodium borohydride
(Journal article; Peer reviewed, 2018)Porous Co–B nanoalloy is a low-cost and highly active catalyst towards the hydrolysis of sodium borohydride (NaBH4). In this study, a facile and room-temperature hydrogen bubble-assisted method was developed to prepare ... -
Materials for Proton Exchange Membrane water electrolyzer bipolar plates
(Journal article; Peer reviewed, 2017)Titanium based BiPolar Plates (BPPs) are commonly used in Proton Exchange Membrane Water Electrolyzers (PEMWEs) today as they can withstand the harsh operating conditions experienced inside an operating PEM water electrolyzer. ... -
Measuring the thermal conductivity of membrane and porous transport layer in proton and anion exchange membrane water electrolyzers for temperature distribution modeling
(Journal article; Peer reviewed, 2019)Water electrolyzers that use a membrane electrolyte between the electrodes are a promising technology towards mass production of renewable hydrogen. High power setups produce a lot of heat which has to be transported through ... -
Minimum entropy generation in a heat exchanger in the cryogenic part of the hydrogen liquefaction process: On the validity of equipartition and disappearance of the highway
(Journal article; Peer reviewed, 2019)Liquefaction of hydrogen is a promising technology for transporting large quantities of hydrogen across long distances. A key challenge is the high power consumption. In this work, we discuss refrigeration strategies that ... -
NOx emissions and turbulent flow field in a partially premixed bluff body burner with CH4 and H2 fuels
(Journal article; Peer reviewed, 2016)The increased need for fuel flexibility and CO2 capture solutions (CCS) in the power and industrial sectors has led to higher focus on hydrogen containing fuels. The high reactivity and combustion temperature in hydrogen ... -
Opportunities and challenges for thermally driven hydrogen production using reverse electrodialysis system
(Journal article; Peer reviewed, 2019)Ongoing and emerging renewable energy technologies mainly produce electric energy and intermittent power. As the energy economy relies on banking energy, there is a rising need for chemically stored energy. We propose heat ... -
Premixed hydrogen-air flames interacting with a hydrogen porous wall
(Journal article; Peer reviewed, 2018)A laminar one-dimensional hydrogen-air flame travelling and quenching towards a chemically inert permeable wall (PW) is studied. Hydrogen flows through the wall into the premixed H2-air. The S3D numerical code with detailed ... -
Pressure swing adsorption for coproduction of power and ultrapure H2 in an IGCC plant with CO2 capture
(Journal article, 2016)The coproduction of power and ultrapure H2 within an Integrated Gasification Combined Cycle (IGCC) plant implementing CO2 capture offers advantages in terms of flexible operation while retaining good efficiency. The common ... -
Reducing the exergy destruction in the cryogenic heat exchangers of hydrogen liquefaction processes
(Journal article; Peer reviewed, 2018)A present key barrier for implementing large-scale hydrogen liquefaction plants is their high power consumption. The cryogenic heat exchangers are responsible for a significant part of the exergy destruction in these plants ... -
Techno-economic assessment of the novel gas switching reforming (GSR) concept for gas-fired power production with integrated CO2 capture
(Journal article, 2018)The focus of this study is to carry out techno-economic analysis of a pre-combustion capture method in Natural Gas based power plants with a novel reactor concept, Gas Switching Reforming (GSR). This reactor concept enables ... -
The influence of graphitization on the thermal conductivity of catalyst layers and temperature gradients in proton exchange membrane fuel cells
(Journal article; Peer reviewed, 2018)As the proton exchange membrane fuel cell (PEMFC) has improved its performance and power density, the efficiency has remained unchanged. With around half the reaction enthalpy released as heat, thermal gradients grow. To ... -
The Sono-Hydro-Gen Process (Ultrasound Induced Hydrogen Production): Challenges and Opportunities
(Journal article; Peer reviewed, 2019)Producing hydrogen using sound waves offers tremendous opportunities, which could lead to a clean, affordable and reliable energy source. Introducing high-frequency sonic waves to liquid water could provide ... -
Thermal conductivity in the three layered regions of MPL coated PTL for the PEM fuel cell
(Journal article; Peer reviewed, 2015)Thermal conductivity of the polymer electrolyte membrane fuel cell (PEMFC) components has achieved increased attention over the past decade. Despite the fact that the PEMFC itself (between the gas flow plates) is less than ...