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Fachbereich / Studiengang
Algorithmic Design and Resilience Assessment of Energy Efficient High-Rise Water Supply Systems
(2019)
Auf den Sommerfall kommt es an: Maßnahmen zur dauerhaften Begrenzung der Kaltwassertemperatur
(2019)
Baumrigolen und (Stadt-)Bäume zeichnen sich durch eine multifunktionale Wirkung aus. Bäume prägen das Stadtbild, spenden Schatten und kühlen durch Verdunstung. Der Rigolenkörper speichert Wasser, dass unmittelbar in den Untergrund eingetragen und teilweise auch zur Baumbewässerung verfügbar ist. Darüber hinaus kann die Rigole einen Beitrag zur Überflutungsvorsorge leisten.
Das Spektrum technischer Filter zur Niederschlagswasserbehandlung reicht von kompakten Anlagen im dezentralen Maßstab bis zu zentralen Anlagen mit mehreren Hektar angeschlossener Fläche. Die hier vorgestellten zentralen Systeme werden im Aufstromverfahren durchflossen. Der Zufluss wird dabei durch Sedimentation oder eine Sedimentation-Lamellen-Kombination vorbehandelt. Das Spektrum der eingesetzten Filtersubstrate ermöglicht den Rückhalt feiner Partikel (AFS63) bis hin zu gelösten Stoffen. Die Rückhaltewirkung von technischen Filtern kann sehr hoch sein, allerdings muss der Kompromiss zwischen Wirkung und Wartung gefunden werden. Die Überwachung der Systeme ist durch Bilanzierung der Füllstände vergleichsweise einfach. Erste Ansätze für eine Bemessung der Systeme werden vorgestellt.
Biohydrogen production via dark fermentation with pig manure and glucose using pH-dependent feeding
(2020)
For the increasingly important storage of renewably generated electricity, this review explains the construction of a surface and underground pumped storage
power plant. The problems for the construction of an underground pumped storage power plant are further listed. These are geological, environmental and
economic problems as well as a low acceptance by the population. The geological problems are concerns about leaching of minerals and heavy metals as well as the statics of the cavities. Mining companies in Germany are obligated to renaturalize the landscape areas again, which could be realised by a lake. Furthermore, care must be taken to ensure that the mine water does not come into contact with the groundwater. According to a survey by RISP on the subsequent use of the mine areas for an underground pumped
storage power plant, the acceptance of the population is over 70 percent. The economic consideration concludes that the arbitrage profit for a difference between off-peak and peak of 10 €/MWh is about 2.7 M€/a and for 100 €/MWh about 27.3 M€/a. With investment costs of about 630 M€, despite the assumption of 100 €/MWh, more than 20 years are needed for an underground pumped storage power plant to be amortized. The acceptance could be increased by creating a lake as a recreation area as well as being used as an upper storage reservoir. Thus, the cost of renaturation decrease when combined with the creation of the storage basin. The problem of ground conditions can be solved by creating new cavities by means of tunnel boring at an inclination. For static safety as well as against leaching of minerals and heavy metals, the cavity walls can be sealed with reinforced concrete. The technology of underground pumped storage power plants can be used for better utilisation of renewable energies. This is especially in flat and densely populated regions a possibility to store energy, because the main part of the power plant is underground.
Childhood social position and associations between environmental exposures and health outcomes
(2008)
This document presents a comparative analysis of
horizontal and vertical small wind turbines for urban
areas in three power classes up to 10 kW in different
categories. The main objective was to conduct a market
analysis to assess the marketability of these wind
energy systems. The aim was to make it easier for
potential customers to make a decision. However, due
to the limited availability of data, the project encountered
considerable difficulties. As a result, the study
became a comparative assessment, which led to results
that may not be readily transferable to urban environments,
slightly missing the original objective of the
study. The results underline the difficulties associated
with conducting a comprehensive market analysis in
this sector and highlight the need for an independent
series of tests under specific conditions. The paper
concludes with a plea for future research efforts to
adapt data collection methods to urban conditions in
order to improve the relevance and applicability of
such studies in practice.