333 Boden- und Energiewirtschaft
Refine
H-BRS Bibliography
- yes (28) (remove)
Departments, institutes and facilities
- Fachbereich Wirtschaftswissenschaften (15)
- Fachbereich Ingenieurwissenschaften und Kommunikation (9)
- Institut für Technik, Ressourcenschonung und Energieeffizienz (TREE) (9)
- Internationales Zentrum für Nachhaltige Entwicklung (IZNE) (8)
- Fachbereich Angewandte Naturwissenschaften (1)
- Institut für Verbraucherinformatik (IVI) (1)
Document Type
- Article (13)
- Part of a Book (7)
- Conference Object (7)
- Contribution to a Periodical (1)
Year of publication
Keywords
- Litho-Jet method (2)
- Compressor modeling (1)
- Elektrizitätswirtschaft (1)
- Energiehandel (1)
- Erdgasgewinnung (1)
- GERG gas law (1)
- Heat Generator (1)
- Hydrogen storage (1)
- Joule Machine (1)
- LC-HRMS (1)
Atmospheric aerosols affect the power production of solar energy systems. Their impact depends on both the atmospheric conditions and the solar technology employed. By being a region with a lack in power production and prone to high solar insolation, West Africa shows high potential for the application of solar power systems. However, dust outbreaks, containing high aerosol loads, occur especially in the Sahel, located between the Saharan desert in the north and the Sudanian Savanna in the south. They might affect the whole region for several days with significant effects on power generation. This study investigates the impact of atmospheric aerosols on solar energy production for the example year 2006 making use of six well instrumented sites in West Africa. Two different solar power technologies, a photovoltaic (PV) and a parabolic through (PT) power plant, are considered. The daily reduction of solar power due to aerosols is determined over mostly clear-sky days in 2006 with a model chain combining radiative transfer and technology specific power generation. For mostly clear days the local daily reduction of PV power (at alternating current) (PVAC) and PT power (PTP) due to the presence of aerosols lies between 13 % and 22 % and between 22 % and 37 %, respectively. In March 2006 a major dust outbreak occurred, which serves as an example to investigate the impact of an aerosol extreme event on solar power. During the dust outbreak, daily reduction of PVAC and PTP of up to 79 % and 100 % occur with a mean reduction of 20 % to 40 % for PVAC and of 32 % to 71 % for PTP during the 12 days of the event.
Reliable and regional differentiated power forecasts are required to guarantee an efficient and economic energy transition towards renewable energies. Amongst other renewable energy technologies, e.g. wind mills, photovoltaic (PV) systems are an essential component of this transition being cost-efficient and simply to install. Reliable power forecasts are however required for a grid integration of photovoltaic systems, which among other data requires high-resolution spatio-temporal global irradiance data.
Das Peren-Theorem
(2018)
Der Artikel beschäftigt sich mit der Analyse des Wassersektors in Sub-Sahara Afrika. Der Schwerpunkt der Arbeit bildet eine länderübergreifende und -vergleichende Analyse der Tarifstruktur, der Subventionspraxis und der Kostendeckungsbeiträge der Wasserversorgungsbetriebe in dieser Region. Die Kosten wie auch die Tarife sind im globalen Vergleich außerordentlich hoch und genügen nur unzureichend ökonomischen und sozialen Leistungsindikatoren. Der afrikanische Kontinent weist einerseits extreme Schwankungen der Wasserverfügbarkeit verbunden mit unzureichenden Wasserspeicher-Kapazitäten, Infrastrukturnetzen und Wasseranschlüssen sowie eine sehr dünne Besiedlungsdichte auf, so dass die durchschnittlichen Kosten der Wasserversorgung sehr hoch sind. Andererseits sind hohe technische und ökonomische Ineffizienzen, einhergehend mit einer nicht zielgenauen Subventionspraxis der Wasserversorgungsbetriebe zu verzeichnen. Zusätzliche Infrastrukturinvestitionen sowie ein effizientes integriertes Wasser-Ressourcen-Management sind notwendig, um hier Abhilfe zu schaffen und eine nachhaltige Wasserversorgung zu gewährleisten.
Smart home systems change the way we experience the home. While there are established research fields within HCI for visualizing specific use cases of a smart home, studies targeting user demands on visualizations spanning across multiple use cases are rare. Especially, individual data-related demands pose a challenge for usable visualizations. To investigate potentials of an end-user development (EUD) approach for flexibly supporting such demands, we developed a smart home system featuring both pre-defined visualizations and a visualization creation tool. To evaluate our concept, we installed our prototype in 12 households as part of a Living Lab study. Results are based on three interview studies, a design workshop and system log data. We identified eight overarching interests in home data and show how participants used pre-defined visualizations to get an overview and the creation tool to not only address specific use cases but also to answer questions by creating temporary visualizations.
Currently, there is a global problem of an increasing need of energy. There will be less fossil fuel, which will be more expensive in the future. The regenerative energies are becoming more and more important. The subject deals the problem of economical feasibility of geothermal energy systems. Its goal is to analyze necesary conditions and aspects of realizing geothermal energy systems in comparison to and competition with traditional energy sources. The geothermal energy recovery is economically advantageous if the investment costs, esp. the drilling costs, could be reduced significantly. It only seems possible to open up a big opportunity for realizing geothermal energy systems by using a rock melt drilling technology, to reduce the investment costs significantly.
Der Weltklimavertrag versucht, sowohl auf das Umsteuern bei klimaschädlichem Wirtschaften in den Industrieländern (und einigen Schwellenländern) als auch auf das Vermeiden von klimaschädlicher Ausgestaltung des Wirtschaftens in den Schwellen- und Entwicklungsländern eine Antwort zu geben. Doch noch ist diese Antwort zu abstrakt.
Solar energy is one option to serve the rising global energy demand with low environmental impact.1 Building an energy system with a considerable share of solar power requires long-term investment and a careful investigation of potential sites. Therefore, understanding the impacts from varying regionally and locally determined meteorological conditions on solar energy production will influence energy yield projections. Clouds are moving on a short term timescale and have a high influence on the available solar radiation, as they absorb, reflect and scatter parts of the incoming light.2 However, the impact of cloudiness on photovoltaic power yields (PV) and cloud induced deviations from average yields might vary depending on the technology, location and time scale under consideration.
Nachhaltigkeit aus institutionenökonomischer Perspektive am Beispiel der Schiefergasförderung
(2014)
Introduction: Some Basic Remarks on Sustainable Forest Management, Environment and Global Ethics
(2010)
The small and remote households in Northern regions demand thermal energy rather than electricity. Wind turbine in such places can be used to convert wind energy into thermal energy directly using a heat generator based on the principle of the Joule machine. The heat generator driven by a wind turbine can reduce the cost of energy for heating system. However the optimal performance of the system depends on the torque-speed characteristics of the wind turbine and the heat generator. To achieve maximum efficiency of operation both characteristics should be matched. In the article the condition of optimal performance is developed and an example of the system operating at maximum efficiency is simulated.
Windkraft Offshore
(2010)
Nach jetzigen Projektionen wird Afrika als einziger Kontinent das UN-Milleniumsziel einer ausreichenden Wasserversorgung nicht erreichen. Notwendig ist eine umfangreiche Analyse des Wasser-Sektors der afrikanischen Staaten, um Ursachen zu ermitteln und entsprechende Handlungsempfehlungen abzuleiten. Im Mittelpunkt der vorliegenden Untersuchung steht eine länderübergreifende und -vergleichende Analyse der Kosten, Tarifstrukturen und der Subventionspraxis der Wasserversorgungsbetriebe in Sub-Sahara Afrika. Dazu wird ein entsprechendes Bewertungs- und Benchmarkingsystem aufgestellt, das anhand ökonomischer Leistungsprinzipien und -indikatoren eine unternehmensund sektorspezifische Analyse ermöglicht und darüber hinaus die Voraussetzungen für einen internationalen Vergleich schafft.