@misc{RaguschJergovicRolleetal.2013, author = {Ragusch, Denny and Jergovic, Michael and Rolle, Siegfried and Giese, Lutz B.}, title = {Beschreibung eines regenerativen Energiesystems mit Wasserstoff- und Brennstoffzellentechnik f{\"u}r Lehre und angewandte Forschung}, series = {Wissenschaftliche Beitr{\"a}ge 2013}, volume = {17}, journal = {Wissenschaftliche Beitr{\"a}ge 2013}, issn = {0949-8214}, doi = {10.15771/0949-8214_2013_1_7}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-3062}, pages = {39 -- 42}, year = {2013}, abstract = {Angesichts der begrenzten Reichweiten fossiler Ressourcen und der durch ihren Verbrauch entstehenden Umweltprobleme, sind regenerative Energien notwendig f{\"u}r eine klimafreundliche Sicherstellung der Energieversorgung der Erde. Ein Hindernis f{\"u}r die breite Einf{\"u}hrung regenerativer Energien ist, dass diese nicht grundlastf{\"a}hig sind. Neue Speichertechnologien und komplexes Energiemanagement k{\"o}nnen hier Abhilfe schaffen. Die in dieser Ver{\"o}ffentlichung vorgestellte Anlage leistet hierzu einen Beitrag, insbesondere in der Ausbildung ben{\"o}tigter Ingenieure und Wirtschaftler. Kernkomponente dieser Anlage stellt die Wasserstoff- und Brennstoffzellentechnik zur klimafreundlichen Erzeugung, Speicherung und R{\"u}ckverstromung von Wasserstoff dar. Mittels regenerativer Energien wird mit einem Elektrolyseur Wasserstoff erzeugt. Die Speicherung erfolgt in Metallhydridspeichern, welche sehr gut an das Druckniveau des Elektrolyseurs angepasst sind. Die R{\"u}ckverstromung erfolgt mittels Brennstoffzellen. Es wird auf die praxisnahen Experimentierm{\"o}glichkeiten dieser Anlage, die ersten Betriebserfahrungen und auf zuk{\"u}nftige Forschungsthemen, eingegangen.}, language = {de} } @inproceedings{GieseFuerkus2020, author = {Giese, Lutz B. and F{\"u}rkus, Stefan}, title = {A Short Approximation Method to Pre-estimate the Electric Yield of Wind Farms}, series = {Conference Proceedings : 1st German-West African Conference on Sustainable, Renewable Energy Systems SusRes : 1st July 2020 - Kara, Togo}, booktitle = {Conference Proceedings : 1st German-West African Conference on Sustainable, Renewable Energy Systems SusRes : 1st July 2020 - Kara, Togo}, doi = {10.15771/978-3-9819225-5-4_SI-2b}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-13256}, pages = {34 -- 40}, year = {2020}, abstract = {Amongst the Renewable Energy Sources (RES) contributing to the worldwide electricity production, wind energy became very important. Germany and several other countries own significant wind potentials. 2\% of a country's area can be used for wind farms, thus Germany could produce easily up to 200 TWhel yearly just onshore. However, often legal and especially financial aspects decide about the speed of development. Careful project preparation guaranteed by professional management is obligatory. Beside factors such as (i) rights to the property and (ii) electric grid connection, (iii) the sufficiency of the wind and peripheral conditions need to be known. A proper wind forecast and yield prognoses are important items. To solve these tasks, professional programs are sold on the markets. To offer a convenient alternative, authors will present software based on Excel named as WindCalc 1.5, which is still under development.}, language = {en} } @inproceedings{Giese2020, author = {Giese, Lutz B.}, title = {Turnaround in Energy Policy - Measures to Reduce the Carbon Dioxide Emission from the Private Sector}, series = {Conference Proceedings : 1st German-West African Conference on Sustainable, Renewable Energy Systems SusRes : 1st July 2020 - Kara, Togo}, booktitle = {Conference Proceedings : 1st German-West African Conference on Sustainable, Renewable Energy Systems SusRes : 1st July 2020 - Kara, Togo}, doi = {10.15771/978-3-9819225-5-4_SIII-1a}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-13248}, pages = {81 -- 86}, year = {2020}, abstract = {The greenhouse gases (GHG) carbon dioxide (CO 2 ), methane (CH 4 ) and nitrous oxide (N 2 O) are considered mainly to be responsible for the additional anthropogenic greenhouse effect, the so-called "global warming". In the private sector, the "Rational Use of Energy" can be a very effective tool (i) to reduce the greenhouse gas emissions, (ii) to decrease the annual energy costs and furthermore (iii) it prepares the integration of Renewable Energy Sources by saving conventional, mostly fossil energy. Aim of this paper is (i) to show that by applying energy saving measures, the primary energy demand and thus the individual (direct) carbon dioxide emission can be reduced in a relevant scale. (ii) It is to give laterally information about (ii.i) the energy market structure and (ii.ii) the legal backgrounds in the EU.}, language = {en} } @inproceedings{GieseReiffStephan2021, author = {Giese, Lutz B. and Reiff-Stephan, J{\"o}rg}, title = {Hydrogen and Usability of Hydrogen Storage Technologies}, series = {2nd German-West African Conference on Sustainable, Renewable Energy Systems (SusRES2021)}, booktitle = {2nd German-West African Conference on Sustainable, Renewable Energy Systems (SusRES2021)}, publisher = {TIB Open Publishing}, address = {Hannover}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-14937}, pages = {97 -- 106}, year = {2021}, abstract = {Science, technology and politics agree: hydrogen will be the energy carrier of the future. It will replace fossil fuels based on a sufficient supply from sustainable energy. Since the possibilities of storing and transporting hydrogen play a decisive role here, the so-called LOHC (Liquid Organic Hydrogen Carriers) can be used as carrier materials. LOHC carrier materials can reversibly absorb hydrogen, store it without loss and release it again when needed. Since little or no pressure is required, normal containers or tanks can be used. The volume or mass-related energy densities can reach around a quarter of liquid fossil fuels. This paper is to give an introduction to the field of hydrogen storage and usage of those LOHC, in particular. The developments of the last ten years have been related to the storage and transport of hydrogen with LOHC. These are crucial to meet the future demand for energy carriers e.g. for mobile applications. For this purpose, all transport systems are under consideration as well as the decentralized supply of rural areas with low technological penetration, e.g. regions of Western Africa which are often characterized by a lack of energy supply. Hydrogen bound in LOHC can provide a hazard-free alternative for distribution. The paper provides an overview of the conversion forms as well as the chemical carrier materials. Dibenzyltoluene as well as N-ethylcarbazole - as examples for LOHC - are discussed as well as chemical hydrogen storage materials like ammonia boranes as alternatives to LOHC.}, language = {en} } @inproceedings{GribovaGiese2021, author = {Gribova, Maria and Giese, Lutz B.}, title = {Sustainably Produced Hydrogen}, series = {2nd German-West African Conference on Sustainable, Renewable Energy Systems (SusRES2021}, booktitle = {2nd German-West African Conference on Sustainable, Renewable Energy Systems (SusRES2021}, publisher = {TIB Open Publishing}, address = {Hannover}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-14940}, pages = {107 -- 116}, year = {2021}, abstract = {The fossil fuels used to provide energy, such as coal, crude oil and natural gas, are largely responsible for carbon dioxide emissions and other so-called greenhouse gases. Hydrogen gas (H2) can make a key contribution to decarbonization. It can be produced using various processes. Several processes are available to produce hydrogen, such as (i) steam reforming, (ii) cracking process or (iii) electrolysis. Depending on the source of origin, there is a distinction made between different "colours". Gray, blue, turquoise, yellow and green hydrogen is avail­able, the latter made using Renewable Energies. However, items such as (i) possible variants of hydrogen, (ii) leading export countries or (iii) provision paths to be preferred in the future will be discussed in this paper.}, language = {en} } @inproceedings{SchmidtGiese2021, author = {Schmidt, Marcus and Giese, Lutz B.}, title = {Bi-facial Open-Space Photovoltaic Systems versus Conventional Systems using Mono-facial Modules}, series = {2nd German-West African Conference on Sustainable, Renewable Energy Systems (SusRES2021)}, booktitle = {2nd German-West African Conference on Sustainable, Renewable Energy Systems (SusRES2021)}, publisher = {TIB Open Publishing}, address = {Hannover}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-14922}, pages = {37 -- 42}, year = {2021}, abstract = {As part of a scientific work within the solar company Sunfarming GmbH, the aim was to find out whether bi-facial modules on open spaces deliver better results economically than conventional mono-facial solar modules. In this context, an already installed 750 kWp PV system with mono-facial solar modules was compared directly with a structurally identical PV system with bi-facial modules, which, however, does not exist in practice but was only simulated with PV software. The second part of the investigation includes the comparison of four different assembly systems or elevation variants in order to determine the system with the best relationship between system yield and costs. The final result of the first investigation showed that the use of bi-facial modules reduced the specific costs per kWh by approximately 5 \%. In order to improve this effect, the use of compact assembly systems is recommended, e.g. five rows of modules per table with horizontal alignment.}, language = {en} } @misc{RaguschJergovićGieseetal.2018, author = {Ragusch, Denny and Jergović, Michael and Giese, Lutz B. and Rolle, Siegfried}, title = {Einsatz der Brennstoffzelle als Netzersatzanlage sicherheitsrelevanter Digitalfunkstationen im Feldtest}, series = {Wissenschaftliche Beitr{\"a}ge 2018}, volume = {22}, journal = {Wissenschaftliche Beitr{\"a}ge 2018}, issn = {0949-8214}, doi = {10.15771/0949-8214_2018_5}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-10251}, pages = {39 -- 45}, year = {2018}, abstract = {Es wird anhand des F{\"o}rderprojekts „Wasserstoff-Netzersatzanlagen der Beh{\"o}rden und Organisationen mit Sicherheitsaufgaben (BOS) des Landes Brandenburg" des Zentraldienstes der Polizei des Landes Brandenburg die Praxistauglichkeit von Brennstoffzellen-Netzersatzanlagen untersucht. Marktreife und kommerziell verf{\"u}gbare Brennstoffzellen wurden in 115 sicherheitsrelevanten Digitalfunkstationen im Fl{\"a}chenland Brandenburg als Ersatz von wartungsintensiven und umweltproblematischen Dieselgeneratoren f{\"u}r die (Not-)Stromversorgung installiert. Diese Netzersatzanlagen sind f{\"u}r eine {\"U}berbr{\"u}ckungszeit von 72 h unter realen Bedingungen ausgelegt und wurden im Feldtest, parallel zum realen Betrieb, {\"u}ber einen l{\"a}ngeren Einsatzzeitraum (ca. 2 Jahre) auf ihre Zuverl{\"a}ssigkeit und Verf{\"u}gbarkeit hin untersucht. Die Anforderungen an und die Realisierung der Brennstoffzellen-Netzersatzanlagen sowie die Feldtest-Versuchsplanung und deren Ergebnisse werden beschrieben und diskutiert. Die Praxistauglichkeit wird mit einer hohen Verf{\"u}gbarkeit {\"u}ber 97 \% und einer Funktionszuverl{\"a}ssigkeit von mehr als 95 \% erfolgreich best{\"a}tigt. Die Entwicklung weiterer Komponenten wird empfohlen.}, language = {de} }