Eva Schwenzfeier-Hellkamp

Fachhochschule Bielefeld · Fachbereich Ingenieurwissenschaften und Mathematik

In a world with growing demand for resources and a worsening climate crisis, it is imperative to research and put into practice more sustainable and regenerative products and processes. Especially in the energy sector, more sustainable systems that are recyclable, repairable and remanufacturable are needed. One promising technology is dye-sensitize...

In times of climate change and increasing resource scarcity, the importance of sustainable renewable energy technologies is increasing. However, the photovoltaic (PV) industry is characterised by linear economy structures, energy-intensive production, downcycling and little sustainability. One starting point for sustainable technologies is offered...

Resources are becoming more expensive and less accessible, for instance construction wood or semiconductors. In addition, climate change requires the conversion of the energy system to 100% renewable energy. Therefore, we need resources to prevent the climate crisis from worsening, but at the same time, we are suffering from a worsening resource cr...

The effects of climate change are becoming increasingly clear, and the urgency of solving the energy and resource crisis has been recognized by politicians and society. One of the most important solutions is sustainable energy technologies. The problem with the state of the art, however, is that production is energy-intensive and non-recyclable was...

In times of climate change and dwindling fossil resources, the need for sustainable renewable energy technologies gains importance, increasingly fast. However, the state of the art technologies are energy intensive in their production, like monocrystalline photovoltaic, or even consist of not recyclable composite material, in the case of wind turbi...

Putting renewable energy to good use is necessary to deal with one of the greatest challenges of our time, namely, climate change. One problem, however, is that the technology we are using today turns into toxic waste at the end of its useful life, which in particular concerns the blades of wind turbines. We investigated how the ideas of a circular...

Dye-sensitized solar cells (DSSCs) are most often built on glass or similar rigid substrates. Transferring them onto textile fabrics would enable using DSSCs on large-scale textile architecture or for several textile-based stand-alone solutions, such as loading a mobile phone by a DSSC tent. For this approach, it is not only necessary to work with...

During the last decade, generating renewable energy has become more and more important, and so did solar cells. This led to a swift development of dye-sensitized solar cells (DSSCs). The highest efficiencies are achieved by cells which use synthetic ruthenium-based dyes; however, DSSCs can also be prepared from low-purity and nontoxic materials. Ex...

Since their discovery, dye-sensitized solar cells (DSSCs) have gained large interest by many researchers. While still showing lower efficiencies than common silicon-based solar cells, they have the advantage to be producible by low-cost, low-toxic materials outside a cleanroom. This is why a large number of research groups concentrates on developin...

Dye-sensitized solar cells (DSSCs) belong to the possible technologies on which future clean energy harvesting can be based. Opposite to silicon-based photovoltaics, DSSCs can be produced purely from non-toxic, inexpensive materials. Nevertheless, nowadays most research is performed aiming at increasing the efficiency of DSSCs based on (mostly toxi...

The possibility to create dye-sensitized solar cells (DSSCs) using nontoxic and inexpensive materials under usual lab or industrial conditions, i.e. without a cleanroom, has aroused large interest in this technology during the last decades. DSSCs are known to function well in low light or diffuse light conditions. Therefore, they could be interesti...

As a cost-effective alternative to silicon-based solar cells, dye-sensitized solar cells (DSSCs) have been subjects of research for more than two decades. Currently, researchers attempt to increase the efficiency and durability of the DSSCs to ensure economic use. They focus on the optimization of the manufacturing process, the dye, the electrolyte...

Dye-sensitized solar cells are subject to intensive research nowadays. Their open-circuit voltage, short-circuit current and the efficiency depend on several parameters which can be optimized. Here, examinations are limited to non-toxic substances due to planned future application on textile fabrics, i.e. to TiO2, graphite and natural dyes. During...

The average age of the German population is increasing due to the demographic change and the growing life expectancy. Consequently the number of elderly people will increase in the next decades. Thus not only the demand for age-appropriate living space is rising there is also a demand for assistance systems which support elderly people in their res...

Dye sensitized solar cells (DSSCs) are silicon free, simply producible solar cells. Longevity, however, is a longstanding problem for DSSCs. Due to liquid electrolytes being commonly used, evaporation of the electrolyte causes a dramatic drop in electric output as cells continue to be used unmaintained. Stopping evaporation has been tried in differ...

The contribution reports on results of scientific investigations of the research project “Light concept for the historic city centre Rietberg” by the Bielefeld University of Applied Science. The project was supported by the Federal Ministry of Education and Research (BMBF) and is one of ten showcases. The goal of the study was to investigate whethe...

The contribution concentrates on the potential of LED (Light Emitting Diode) lighting. After a short introduction into light in general, the additive mixture of colour stimuli which lead to white light is explained. The contribution concentrates on white light which is generated by a blue LED chip covered over a yellow phosphor layer. Based on the...

• Eignung eines für den öffentlichen Raum konzipierten dynamischen Sicherheitsleitsystems für den privaten Wohnungsbau analysieren • Am Beispiel des Systems GuideLight von HANNING & KAHL • Betrachtung verschiedener Szenarien sowohl im Alltag als auch im Evakuierungsfall in Bezug auf Orientierung und Sicherheit

At the faculty of Engineering and Mathematic of the Bielefeld University of Applied Sciences was an innovative light control for cowshed conceptualized which considered the circadian rhythm of the milk cattle and will increase its wellbeing. The light control is dependent of the personal detection, which will be realized by two cascaded light barri...

Hintergrundinformationen: - Verstärkter Einsatz von LED-Leuchten im Bereich der Straßenbeleuchtung - Betrachtung von Hauptverkehrsstraßen, da Nebenstraßen häufig mit LED-Beleuchtung ausgestattet sind - Ermittlung der relevanten Kriterien bei der Entscheidung für eine LED-Straßenleuchte - Gegenüberstellung von eingesetzten Produkten und Anforderun...

Die klassische Betrachtung des Preis-Leistungsvergleichs bei der Anschaffung von neuen Produkten sollte bei technischen Produkten die Betrachtung des technischen Risikomanagements enthalten. Der wesentliche Vorteil der Berücksichtigung des technischen Risikomanagements ist, dass die Produkte kontinuierlich und systematisch durch den Hersteller verb...

Datenbank für Fehler und Schäden von LED-Leuchten - PQL-Forschungsprojekt - Aufbau der Fehler- und Schadensdatenbank - Quellen für Fehlerinput - Fehler erfassen in der Datenbank Risikobewertung der Fehlerfälle und abgeleitetes Ranking von Fehlerfällen Leitfaden für LED-Hersteller und LED-Leuchtenhersteller zur Unterstützung der Umsetzung des Risiko...