Ivar Johan Halvorsen
Ivar Johan Halvorsen
Publikasjoner og ansvarsområder
Low-Frequency EIS intercept as a Diagnostic Tool for PEM Fuel Cells Degradation
Abstract - Several diagnostic tests, such as polarization curves, electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV), were conducted periodically to monitor performance degradation during an accelerated stress test (AST) for catalyst degradation on a single proton exchange mem...
Rejuvenation of Fuel Cells
Control of Reversible Degradation Mechanisms in Fuel Cells: Mitigation of CO contamination
Fuel Cells are subject to several degradation phenomena where some are reversible and some irreversible. Normally all contribute to a reduced cell voltage, but it may be complicated to discriminate the particular causes. A brief overview is given and a method for modelling and controlling the partic...
Handling of variable wireless latency and updating frequency in PI controllers
In closed loop process control with wireless measurements it must be ensured that communication packet dropouts and variable latency is handled properly with respect to the impact on the controlled process. A procedure for automatic adjustment of the controller parameters is presented. The main prop...
Dividing-Wall Column for Fractionation of Natural Gas Liquids in Floating Liquefied Natural Gas Plants
The development of floating liquefied natural gas (FLNG) plants has resulted in a focus on reducing the weight and size of the topside processing facilities for these units. The conventional fractionation of natural gas liquids (NGL) in LNG plants implies a direct sequence of three or more conventio...
Dual Control of low concentration CO poisoning by Anode Air Bleeding of Low Temperature Polymer Electrolyte Membrane Fuel Cells
Fuel impurities, fed to a polymer electrolyte membrane fuel cell, can affect stack performance by poisoning of catalyst layers. This paper describes the dynamic behaviour of a stack, including state-of-the-art membrane electrode assemblies (MEA) of three different manufacturers, at different operati...