Collection schemes based on DC technologies appear as a possible alternative to present layouts of offshore wind farms to reduce the installation and operational costs. Within these internal DC collection schemes, series connection can be particularly attractive when a sufficiently high number of...
Society is critically dependent on a reliable electricity supply to maintain its functionality. Electricity supply interruptions lead to direct consequences for the electricity users and will in general have an impact on dependent infrastructures and their services. This chapter describes a...
The main purpose of the work presented in this paper was to experimentally examine possible water tree enhancement caused by dynamic mechanical tension. The experiments were performed using samples of 12 kV XLPE cables exposed to static and dynamic tension. A test rig was designed allowing...
This work aims to analyze the torrefaction process with Norwegian birch and spruce as feedstocks. Torrefaction experiments were performed in a macro-TGA (thermogravimetric analysis) reactor with provisions for continuous volatile measurements through micro-GC (gas chromatography) and FTIR (Fourier...
A topology-correct transformer model, which covers core operation under heavy saturation conditions, is presented. A method of accounting for magnetic fluxes outside the core and windings is proposed. Representation of the magnetization curve at high flux densities is considered. The equivalent air...
Offshore wind turbines have potential to supply offshore oil and gas platforms in the North Sea with electric energy. For remote located facilities it is attractive to pursue a solution where the wind turbines and oil platform operate in an isolated system. To study the operational properties of a...
The timing and selection of CO2 sources will affect the cost of achieving projected CCS based emission reductions. Performed process simulations and cost estimations clearly point out the impact of CO2 concentration and steam supply when capturing CO2 from an atmospheric gas stream with MEA-based...
ABSTRACT In this work the ash sintering behaviors and effects of aluminosilicates based additives (kaolin, zeolite 24A and zeolite Y) during combustion of wheat straw and barley husk were investigated. The sintering degrees of fuel ashes and corresponding mixtures with additives were evaluated...
A method for computer simulations of snow drift around man made structures is described. Particles are tracked in space and time based on a Lagrangian-Eulerian description of particle and wind velocities, respectively. Calculation of the wind phase is governed by the general Navier-Stokes equations...