Marlis Morschel

Hochschule Rhein-Waal · Faculty of Technology and Bionics

Durch die geplante CO2-Strafsteuer in Europa und den USA stehen Automobilhersteller seit einiger Zeit unter erhöhtem Druck, den Kraftstoffverbrauch ihrer Neufahrzeugflotten zu senken, um Strafzahlungen zu reduzieren oder gar zu vermeiden. Zur Einhaltung der CO2-Zielvorgaben wird an etlichen kraftstoffsparenden Technologien, wie Elektrifizierung des...

Many factors, like shortage of oil or environmental pollution, lead to the need for a new and highly efficient engine generation in passenger vehicles. Plug-in hybrid electric vehicles (PHEVs) are a promising approach. Most car manufacturers therefore offer at least one hybrid vehicle. Even in these highly efficient vehicles, there is still an amou...

Waste-heat regeneration of automotive combustion engines poses one promising application for thermoelectric generators (TEG). Nevertheless, the variation of the combustion temperature during operation leads to cyclic loads on TEGs and therefore to varying stress inside the module. This stress may lead to fatigue and reduce the high durability of TE...

Any heat flow not carried by electrons has to be minimized in order to achieve high efficiency thermoelectric (TE) materials. While the impact of phonon transport properties is commonly taken into consideration, photon transport properties are neglected in the TE community. Inside TE materials at high temperatures and carrier concentrations, a sign...

In thermoelectric applications, optimized thermal contacts are essential to enable efficient and homogeneous flow of heat currents. Thermomechanical stresses may lead to surface deformation, which alters the thermal contact. As a result, the heat current density is reduced and no longer homogeneous. Also an undesired temperature gradient perpendicu...

Most of the cooling units are electrically driven compression chillers. Besides having a poor total energy balance, they cause a great stress to the power network in summer. A good alternative are cooling units using heat as driving force. Here a thermal driven ammonia based resorption process with reduced system pressure is investigated. Resorptio...

High temperature thermoelectric generators (TEG) enable elevated conversion efficiencies, but require suitable materials and smart packaging. However, internal thermal bypasses given by the setup of the modules may reduce the efficiency when compared to the theoretical prediction. In a classical TE-module two ceramic plates are separated by the len...