Blar i NTNU Open på forfatter "Bock, Robert"
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Aktiv laststyring i mikronett
Lyngved, Kristian; Mickelborg, Thomas; Teigmoen, Anders (Bachelor thesis, 2019)Norway has a large coastal area with many islands that are provided with electricity from expensive sub-sea cables and long transmission lines. In stead of renewing existing infrastructure in remote areas, it could be cost ... -
Electrodialytic Energy Storage System: Permselectivity, Stack Measurements and Life-Cycle Analysis
Krakhella, Kjersti Wergeland; Morales, Marjorie; Bock, Robert; Seland, Frode; Burheim, Odne Stokke; Einarsrud, Kristian Etienne (Peer reviewed; Journal article, 2020)Reverse electrodialysis and electrodialysis can be combined into a closed energy storage system, allowing for storing surplus energy through a salinity difference between two solutions. A closed system benefits from simple ... -
Experimental Study of Thermal Conductivity and Compression Measurements of the GDL-MPL Interfacial Composite Region
Bock, Robert; Shum, Andrew; Khoza, Thulile; Seland, Frode; Hussain, Nabeel; Zenyuk, Iryna V.; Burheim, Odne Stokke (Journal article, 2016)MPL and GDL in a PEM fuel cell assembly are often treated as separate layers in the literature. However, there exists a considerable interfacial region where the two different materials merge. The MPL consists of fine ... -
Heat Sources, Thermal Conductivity and Heat Distribution in Electrochemical Energy Storage Technologies
Bock, Robert (Doctoral theses at NTNU;2018:408, Doctoral thesis, 2018)The work presented in this thesis is based on taking thermal conductivity measurements of a range of materials used in three different electrochemical energy storage technologies. Specifically, two hydrogen technologies, ... -
Heat to H2: Using Waste Heat for Hydrogen Production through Reverse Electrodialysis
Krakhella, Kjersti Wergeland; Einarsrud, Kristian Etienne; Burheim, Odne Stokke; Seland, Frode; Bock, Robert (Journal article; Peer reviewed, 2019)This work presents an integrated hydrogen production system using reverse electrodialysis (RED) and waste heat, termed Heat to H2. The driving potential in RED is a concentration difference over alternating anion and cation ... -
Heat to Hydrogen by Reverse Electrodialysis—Using a Non-Equilibrium Thermodynamics Model to Evaluate Hydrogen Production Concepts Utilising Waste Heat
Solberg, Simon Birger Byremo; Zimmermann, Pauline; Wilhelmsen, Øivind; Lamb, Jacob Joseph; Bock, Robert; Burheim, Odne Stokke (Peer reviewed; Journal article, 2022)The reverse electrodialysis heat engine (REDHE) is a promising salinity gradient energy technology, capable of producing hydrogen with an input of waste heat at temperatures below 100 °C. A salinity gradient drives water ... -
The influence of concentration and temperature on the membrane resistance of ion exchange membranes and the levelised cost of hydrogen from reverse electrodialysis with ammonium bicarbonate
Raka, Yash Dharmendra; Bock, Robert; Karoliussen, Håvard; Wilhelmsen, Øivind; Burheim, Odne Stokke (Peer reviewed; Journal article, 2021)The ohmic resistances of the anion and cation ion-exchange membranes (IEMs) that constitute a reverse electrodialysis system (RED) are of crucial importance for its performance. In this work, we study the influence of ... -
Measuring the thermal conductivity of membrane and porous transport layer in proton and anion exchange membrane water electrolyzers for temperature distribution modeling
Bock, Robert; Karoliussen, Håvard; Seland, Frode; Pollet, Bruno; Thomassen, Magnus; Holdcroft, Steven; Burheim, Odne Stokke (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 ... -
On the porosity-dependent permeability and conductivity of triply periodic minimal surface based porous media
Sauermoser, Marco; Veldurthi, Naresh Kumar; Wölfle, Christoph Hubertus; Svartvatn, Preben Johnsen; Flo Hoem, Svenn Ove; Lid, Markus Joakim; Bock, Robert; Palko, James W.; Torgersen, Jan (Journal article; Peer reviewed, 2023)With the fast development in the field of additive manufacturing, triply periodic minimal surface (TPMS) based porous media have recently found many uses in mechanical property tuning. However, there is still a lack of ... -
Optimization of Microgrids Feasibility Study and Economic Analysis of Rye Microgrid
Berge, Renate Høvik; Haugland, Fredrik Rudfoss; Langseth, Ida Erika Witt (Bachelor thesis, 2019)Mikronett har potensialet til å bli en fremtidlig løsning for å forsyne avsidesliggende steder med energi. TrønderEnergi undersøker denne forretningsmuligheten som en del av REMOTE prosjektet på Froan, en gruppe øyer på ... -
The influence of argon, air and hydrogen gas on thermal conductivity of gas diffusion layers and temperature gradients in PEMFCs
Bock, Robert; Hamre, Bjørnar; Onsrud, Morten Andreas; Karoliussen, Håvard; Seland, Frode; Burheim, Odne Stokke (Journal article; Peer reviewed, 2019)Gas diffusion layers (GDL) in fuel cells have to satisfy a range of conflicting demands. They must deliver good mass transport, but also good electrical and thermal transport. The thermal conductivity of two GDLs was ... -
The influence of graphitization on the thermal conductivity of catalyst layers and temperature gradients in proton exchange membrane fuel cells
Bock, Robert; Karoliussen, Håvard; Pollet, Bruno; Secanell, Marc; Seland, Frode; Stanier, Dave; Burheim, Odne Stokke (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 ... -
Thermal Conductivity and Compaction of GDL-MPL Interfacial Composite Material
Bock, Robert; Shum, A. D.; Xiao, X.; Karoliussen, Håvard; Seland, Frode; Zenyuk, Iryna V.; Burheim, Odne Stokke (Journal article; Peer reviewed, 2018)The microporous layer (MPL) and the gas diffusion layer (GDL) in a polymer electrolyte membrane (PEM) fuel cell assembly are often treated as separate layers in the literature. However, there exists a considerable third ... -
Thermal Conductivity in PEMFC PTLs with Different Gas Content and Corresponding simple PEMFC Internal Temperature Profiles
Hamre, Bjørnar (Master thesis, 2017)More than 50 % of the PEMFC (Polymer Electrolyte Membrane Fuel Cell) energy is released as heat. The aim for this thesis was to contribute to the understanding of the management of that heat. The heat management in the ... -
Thermal conductivity in the three layered regions of MPL coated PTL for the PEM fuel cell
Burheim, Odne Stokke; Crymble, Gregory A.; Bock, Robert; Hussain, Nabeel; Pasuphati, Sivakumar; Du Plessis, Anton; le Roux, Stephan; Seland, Frode; Su, Huaneng; Pollet, Bruno G. (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 ... -
Thermal Gradients with Sintered Solid State Electrolytes in Lithium-Ion Batteries
Bock, Robert; Onsrud, Morten; Karoliussen, Håvard; Pollet, Bruno; Seland, Frode; Burheim, Odne Stokke (Journal article; Peer reviewed, 2020)The electrolyte is one of the three essential constituents of a Lithium-Ion battery (LiB) inaddition to the anode and cathode. During increasingly high power and high current charging anddischarging, the requirement for ... -
Topology Optimization of a Gas Diffusion Layer for Polymer Electrolyte Fuel Cells
Hoem, Svenn Ove Flo (Master thesis, 2021)For å nå det punktet hvor brenselcelleteknologi kan konkurrere økonomisk med og ta markedsandeler fra forbrenningsmotorer og batteridrevne kjøretøy, må energitapene knyttet til drift med høy strømtetthet reduseres. En av ...