TY - CHAP A1 - Schierack, Frank A1 - Priesmeier, U. A1 - Krautz, Hans Joachim A1 - Thielen, W. T1 - Theoretische Voruntersuchungen zum Versuchsbetrieb an der Technikumsanlage mit zirkulierender Druckwirbelschichtfeuerung (ZDWSF 2.Generation) der BTU Cottbus Y1 - 2000 SN - 3-18-091535-9 ER - TY - CHAP A1 - Rombrecht, Hans-Bernd A1 - Krautz, Hans Joachim T1 - The BTU Cottbus PFCBC, 2nd Generation Lab-scale-Plant Experiences and Results Y1 - 2005 ER - TY - CHAP A1 - Martin, Jörg S. A1 - Höhne, Olaf A1 - Krautz, Hans Joachim T1 - Druckaufgeladene Dmpfwirbelschichttroknung als Weg zur Effizienzsteigerung in Braunkohlekraftwerken: Betriebsergebnisse vom Versuchstrockner der BTU Cottbus Y1 - 2005 ER - TY - CHAP A1 - Merzsch, Matthias A1 - Silbermann, Rico A1 - Lechner, Stefan A1 - Krautz, Hans Joachim T1 - Druckaufgeladene Dampfwirbelschicht-Trocknung (DDWT) von Braunkohlen: Neuste Betriebsergebnisse von der BTU-Versuchsanlage Y1 - 2010 ER - TY - CHAP A1 - Lechner, Stefan A1 - Höhne, Olaf A1 - Krautz, Hans Joachim T1 - Pressurized steam fluidized bed drying (PSFBD) of lignite: constructional and process optimization at the BTU test facility and experimental results Y1 - 2009 ER - TY - CHAP A1 - Löffler, Steffen T1 - EBSILON im akademischen Einsatz an der BTU Cottbus Y1 - 2011 ER - TY - GEN A1 - Asegehegn, Teklay Weldeabzgi A1 - Schreiber, Matthias A1 - Krautz, Hans Joachim T1 - Influence of two- and three-dimensional simulations on bubble behaviorin gas-solid fluidized beds with and without immersed horizontal tubes Y1 - 2012 U6 - https://doi.org/10.1016/j.powtec.2011.11.050 ER - TY - CHAP A1 - Ziems, Christian A1 - Krautz, Hans Joachim T1 - Alkalische Elektrolyse - Kernkomponente eines Hybridkraftwerks im Kontext Power to Gas Y1 - 2012 ER - TY - CHAP A1 - Kangwanpongpan, Tanin A1 - Klatt, Matthias A1 - Krautz, Hans Joachim T1 - Challenges of oxyfuel combustion modeling for carbon capture Y1 - 2012 ER - TY - CHAP A1 - Krautz, Hans Joachim A1 - Ziems, Christian T1 - Erneuerbare Energien - Chancen und Herausforderungen für neue Technologien in einer zukünftig nachhaltigen Energiewirtschaft Y1 - 2011 ER - TY - CHAP A1 - Schreiber, Matthias A1 - Krautz, Hans Joachim T1 - Numerical and Experimental Investigation of Tube-to-Bed Heat Transfer in a Bubbling Fluidized Bed of Lignite Particles T2 - 21st International Conference on Fluidized Bed Combustion, Neapel, 2012 Y1 - 2012 ER - TY - CHAP A1 - Ziems, Christian A1 - Tillmann, Christine A1 - Krautz, Hans Joachim T1 - H2-Forschung an der BTU Cottbus T2 - 4. Energiefachtagung, Cottbus, 2012 Y1 - 2012 ER - TY - CHAP A1 - Ziems, Christian A1 - Krautz, Hans Joachim T1 - Alkalische Druckelektrolyse - Schlüsseltechnologie für zukünftige Energie- und Speicherkonzepte T2 - 4. Energiefachtagung, Cottbus, 2012 Y1 - 2012 ER - TY - CHAP A1 - Ziems, Christian A1 - Tannert, Daniel A1 - Krautz, Hans Joachim T1 - Project presentation - Design and installation of advanced high pressure alkaline electrolyzer-prototypes T2 - 19. World Hydrogen Energy Conference, Toronto, 2012 Y1 - 2012 UR - http://www.whec2012.com/wp-content/uploads/2012/06/2012_06_19-Christian-Ziems-Design-and-installation-of-advanced-high-pressure-alkaline-electrolyzer-prototypes_eng_pdf.pdf ER - TY - CHAP A1 - Ziems, Christian A1 - Tannert, Daniel A1 - Krautz, Hans Joachim T1 - First modeling results of an advanced pressurized alkaline electrolyzer for hydrogen production T2 - 19. World Hydrogen Energy Conference, Toronto, 2012 Y1 - 2012 ER - TY - CHAP A1 - Ziems, Christian A1 - Krautz, Hans Joachim T1 - Wasserelektrolyse - Praxiserfahrungen im Modellprojekt T2 - Dena Konferenz "Power to Gas - innovative Systemlösungen für ein zukunftsfähiges Energiesystem entwickeln", Berlin, 2012 Y1 - 2012 ER - TY - CHAP A1 - Ziems, Christian A1 - Krautz, Hans Joachim T1 - High pressure alkaline electrolyzer as a core component for power to gas applications T2 - Dena Konferenz "Power to Gas - innovative Systemlösungen für ein zukunftsfähiges Energiesystem entwickeln", Berlin, 2012 Y1 - 2012 ER - TY - CHAP A1 - Ziems, Christian A1 - Krautz, Hans Joachim T1 - Grid integration of renewable energies and hydrogen research at BTU Cottbus T2 - Dena Konferenz "Power to Gas - innovative Systemlösungen für ein zukunftsfähiges Energiesystem entwickeln", Berlin, 2012 Y1 - 2012 ER - TY - CHAP A1 - Wenske, Michael A1 - Tillmann, Christine A1 - Krautz, Hans Joachim T1 - Aktuelle Entwicklungen der alkalischen Elektrolyse T2 - 4. Energiefachtagung, Cottbus, 2012 Y1 - 2012 ER - TY - CHAP A1 - Merzsch, Matthias A1 - Posselt, Joachim A1 - Wiedemann, Philipp A1 - Lechner, Stefan A1 - Krautz, Hans Joachim T1 - Druckaufgeladene Dampfwirbelschicht-Trocknung (DDWT) von Braunkohlen: Grundlagenuntersuchungen zur verfahrenstechnischen Optimierung der Dampfwirbelschicht-Trocknung von Braunkohlen T2 - Kraftwerkstechnik, Bd. 4, 44. Kraftwerkstechnisches Kolloquium, Dresden Y1 - 2012 SN - 978-3-935317-87-0 SP - 923 EP - 934 PB - TK-Verlag CY - Nietwerder ER - TY - GEN A1 - Kangwanpongpan, Tanin A1 - Franca, Francis H. R. A1 - Correa da Silva, Rodrigo A1 - Smith Schneider, Paulo A1 - Krautz, Hans Joachim T1 - New correlations for the weighted-sum-of-gray-gases model in oxy-fuel conditions based on HITEMP 2010 database T2 - International Journal of Heat and Mass Transfer Y1 - 2012 U6 - https://doi.org/10.1016/j.ijheatmasstransfer.2012.07.032 SN - 0017-9310 VL - 55 IS - 25-26 SP - 7419 EP - 7433 ER - TY - CHAP A1 - Tannert, Daniel A1 - Ziems, Christian A1 - Krautz, Hans Joachim T1 - Overview and initial experiences of a 60 bar alkaline electrolyser prototype T2 - Proceedings of the 14th International Symposium on Heat Transfer and Renewable Sources of Energy, Szczecin-Miedzyzdroje, Poland, September 06-09, 2012 Y1 - 2012 SN - 978-83-7663-121-9 PB - Wydawnistwo Uczelnianie ZUT CY - Szczecinie ER - TY - CHAP A1 - Krause, S. A1 - Krautz, Hans Joachim A1 - Lehmann, J. A1 - Luschtinetz, Thomas A1 - Kruse, T. T1 - Operating regime of a hydrogen-storage-loop power plant of grid relevant dimensions T2 - Proceedings of the 14th International Symposium on Heat Transfer and Renewable Sources of Energy, Szczecin-Miedzyzdroje, Poland, September 06-09, 2012 Y1 - 2012 SN - 978-83-7663-121-9 PB - Wydawnistwo Uczelnianie ZUT CY - Szczecinie ER - TY - CHAP A1 - Ziems, Christian A1 - Tannert, Daniel A1 - Krautz, Hans Joachim T1 - Approaches for simulation of an advanced alkaline water electrolyzer prototype T2 - Proceedings of the 14th International Symposium on Heat Transfer and Renewable Sources of Energy, Szczecin-Miedzyzdroje, Poland, September 06-09, 2012 Y1 - 2012 SN - 978-83-7663-121-9 PB - Wydawnistwo Uczelnianie ZUT CY - Szczecinie ER - TY - CHAP A1 - Aha, Ulrich A1 - Koch, Alexander A1 - Krautz, Hans Joachim T1 - Finding the optimal power plant maintenance strategy with fuzzy input data T2 - 11th International Probabilistic Safety Assessment and Management Conference and the Annual European Safety and Reliability Conference 2012, (PSAM11 ESREL 2012), Helsinki, Finland 25 - 29 June 2012, Vol. 1 Y1 - 2012 SN - 978-1-62276-436-5 SP - 341 EP - 347 PB - IAPSAM & ESRA CY - Red Hook, NY ER - TY - GEN A1 - Merzsch, Matthias A1 - Lechner, Stefan A1 - Krautz, Hans Joachim T1 - Heat-transfer from single horizontal tubes in fluidized beds: Influence of tube diameter, moisture and diameter-definition by Geldart C fines content T2 - Powder Technology Y1 - 2012 U6 - https://doi.org/10.1016/j.powtec.2012.12.002 SN - 1873-328X ER - TY - CHAP A1 - Ziems, Christian A1 - Tannert, Daniel A1 - Krautz, Hans Joachim T1 - Grundlagenforschung zur Optimierung des alkalischen Druckelektrolyseprozesses am 25 bar Einzel-Zell-Versuchsstand - Projektvorstellung T2 - 19. Symposium - Nutzung regenerativer Energiequellen und Wasserstofftechnik, 8. - 10. November 2012 Stralsund Y1 - 2012 SN - 978-3-9813334-5-9 PB - Fachhochschule CY - Stralsund ER - TY - CHAP A1 - Tannert, Daniel A1 - Ziems, Christian A1 - Tillmann, Christine A1 - Krautz, Hans Joachim T1 - Einrichtung und Erfahrungen aus der Inbetriebnahme einer fortschrittlichen alkalischen Druckelektrolyseanlage T2 - 19. Symposium - Nutzung regenerativer Energiequellen und Wasserstofftechnik, 8. - 10. November 2012 Stralsund Y1 - 2012 SN - 978-3-9813334-5-9 PB - Fachhochschule CY - Stralsund ER - TY - CHAP A1 - Kangwanpongpan, Tanin A1 - Nimtz, Michael A1 - Klatt, Matthias A1 - Krautz, Hans Joachim T1 - Numerical Investigations for Oxy-fuel Combustion in 0.4 MWth Pilot Scale Furnace T2 - Geo-Energy International Conference Y1 - 2012 UR - http://dc-app3-13.gfz-potsdam.de/images/dokumente/kangwanpongpan-geoen-poster.pdf ER - TY - GEN A1 - Ziems, Christian A1 - Tannert, Daniel A1 - Krautz, Hans Joachim T1 - Project presentation: Design and installation of advanced high pressure alkaline electrolyzer-prototypes T2 - Energy Procedia Y1 - 2012 U6 - https://doi.org/10.1016/j.egypro.2012.09.087 SN - 1876-6102 VL - 29 SP - 744 EP - 753 ER - TY - THES A1 - Schreiber, Matthias T1 - Modellierung von Hydrodynamik und Wärmeübertragung in blasenbildenden Wirbelschichten zur Trocknung von Braunkohle Y1 - 2013 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:co1-opus-27263 UR - http://opus.kobv.de/btu/volltexte/2013/2726/ ER - TY - THES A1 - Lechner, Stefan T1 - Untersuchungen zur Berechnung und Optimierung des Wärmeübergangs bei der Dampfwirbelschicht-Trocknung am Beispiel von Lausitzer Braunkohlen Y1 - 2012 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:co1-opus-27120 UR - http://opus.kobv.de/btu/volltexte/2012/2712/ ER - TY - CHAP A1 - Wiese, Bernd A1 - Nimtz, Michael A1 - Möller, Fabian A1 - Otto, Christopher A1 - Liebscher, Axel A1 - Schmidt-Hattenberger, Cornelia T1 - Determination of thermodynamics in a CO2 injection well using pressure and distributed temperature sensing T2 - Models – repositories of knowledge, proceedings of Model CARE2011 held in Leipzig, Germany, September 2011 Y1 - 2012 SN - 978-1-907161-34-6 SP - 286 EP - 290 PB - IAHS Publication CY - Wallingford ER - TY - THES A1 - Höhne, Olaf T1 - Grundlagenuntersuchungen zum Einfluss des Systemdrucks auf die Trocknung von Braunkohle in Wasserdampf Y1 - 2012 UR - http://www.cuvillier.de/flycms/de/html/30/-UickI3zKPS3wdUg=/Buchdetails.html SN - 978-3-9540407-6-6 PB - Cuvillier CY - Göttingen ER - TY - CHAP A1 - Wiedemann, Philipp A1 - Krautz, Hans Joachim T1 - Numerical study of gas–solid fluidized beds: Analysis of pressure fluctuations for detection of disturbed fluidization T2 - The 14th International Conference on Fluidization – From Fundamentals to Products N2 - Numerical simulations using the Two Fluid Model are performed for gas-solid bubbling fluidized beds. The possibility to detect disturbances in the fluidization process is investigated by common analysis of pressure fluctuations and variation of the computational domain. Additionally the influences of different particle sizes and superficial gas velocities are studied. The results are compared with bubble properties obtained from a digital image analysis technique KW - Fluidisierung Y1 - 2013 UR - http://dc.engconfintl.org/fluidization_xiv/71 PB - Engineering Conferences International CY - New York ER - TY - GEN A1 - Krautz, Hans Joachim A1 - Nimtz, Michael T1 - Flexible Operation of CCS Power Plants to Match Variable Renewable Energies T2 - Energy Procedia N2 - The German Energiewende is resulting in high grid load changes caused by renewable energies. Therefore flexibility of power plants is getting more and more important. Future CCS power plants are usually equipped with more components than conventional power plants, resulting in a more complex and inert reaction on changes in power output. Additionally, due to the change in price structures and higher fixed and operational costs for CCS power plants, it is harder for them to be economically efficient. This study will show different options to increase the flexibility of CCS power plants and evaluate their benefits. KW - CCS; Flexibility; Post combustion capture; Oxyfuel; Solvent storage; Pipeline Y1 - 2013 U6 - https://doi.org/10.1016/j.egypro.2013.08.034 SN - 1876-6102 VL - 2013 IS - 40 SP - 294 EP - 303 ER - TY - GEN A1 - Krautz, Hans Joachim A1 - Corrêa da Silva, Rodrigo A1 - Kangwanpongpan, Tanin T1 - Flame pattern, temperatures and stability limits of pulverized oxy-coal combustion T2 - Fuel : the science and technology of fuel and energy N2 - The challenges in maintaining a stable oxy-coal flame have been reported in the open literature. In case of pulverized coal combustion, narrower flammable regimes arise not only of differences in the feed gas composition, but also due to changes in the flow dynamics because of reduced volume flow rate through the burners to match similar temperatures and radiative heat transfer within the furnace. The present work focuses on the study of flame structure and stability of pre-dried lignite fired by a staged feed-gas burner. Experimental runs were carried out in a 0.40 MWth laboratory facility, with the objective of investigating the effects of swirl strength and feed gas distribution in the burner registers. To assess the experimental data, a numerical study of the non-reacting flow in the near burner region is performed. Predicted flow pattern and flame images show that the primary fuel jet penetrates the internal recirculation zone, forming an annular doughnut reverse flow region for both firing conditions and resembling a type-1 flame pattern. Temperature measurements indicate that the feed gas distribution among the burner registers control the flame temperature in parallel with the swirl number in both air-fired and oxy-fired environments. The oxy-fuel cases exhibite markedly reduced temperatures on the flame axis. This difference in the core arises not just from the more pronounced penetration depth of the primary jet, but also due to reaction mechanisms including pyrolysis and gasification reactions at the higher concentrations of CO2 and water vapor. Flame stabilization is shown to be strongly dependent on an appropriate distribution of the feed gas and strength of swirling flow in the burner front. The results correlated in terms of swirl number, secondary/tertiary flow ratio and secondary/primary axial momentum point to similarities in the stability limits between air-firing and oxy-firing. KW - Oxy-fuel; Pulverized coal combustion; Flame pattern; Stability limits Y1 - 2014 U6 - https://doi.org/10.1016/j.fuel.2013.07.049 SN - 0016-2361 IS - Vol. 115 SP - 507 EP - 520 ER - TY - GEN A1 - Abang, Roger Atini A1 - Lisk, Alexander A1 - Krautz, Hans Joachim T1 - Fireside corrosion of superheater materials under oxy-coal firing conditions T2 - Energy Procedia N2 - The present study investigates the fireside corrosion behavior of selected superheater materials, namely: T24, P92, VM12-SHC, A800HT, and 7RE10 under oxy-coal combustion atmospheres. Data on mass change, scale thickness, metal loss, surface morphology and micro-structural characteristics of corrosion products were obtained. The alloy specimens were analyzed by SEM-EDX, light microscopy and X-Ray diffraction techniques. The results after 2000 hours of exposure at a metal surface temperature of 600 °C indicate that metal wastage increased with decreasing Cr-content under oxy-coal conditions. Y1 - 2013 U6 - https://doi.org/10.1016/j.egypro.2013.08.035 SN - 1876-6102 VL - 40 SP - 304 EP - 311 ER - TY - GEN A1 - Lechner, Stefan A1 - Merzsch, Matthias A1 - Krautz, Hans Joachim T1 - Heat-transfer from horizontal tube bundles into fluidized beds with Geldart A lignite particles T2 - Powder Technology N2 - This work investigates the heat transfer mechanism in fluidized beds equipped with horizontal heat exchanger surfaces such as single tubes and especially tube bundles. Previous works were performed for varying operating conditions and solids' material properties, leading to a heterogeneous and therefore not applicable spectrum of derived correlations for the influence of tube diameter and tube bundle geometry on heat transfer. Based on a wide range validation of the correlation for the influence of single tube diameter on heat transfer coefficient, tube bundles with different tube diameters and horizontal and vertical spacings and alignments were investigated. Experiments were carried out using electrical heat transfer probes in a 0.15 m2 fluidized bed test facility at ambient conditions. Geldart A lignite and Geldart D solids were used in order to distinguish between predominant particle-convective and gas-convective heat transfer mechanisms. The tube bundle reduction factor on heat transfer coefficient was derived as a key parameter based on dimensionless geometric numbers. This factor predicts the reduction of the heat transfer coefficient compared to that of the single tube due to the particle and gas flow disturbances caused by the immersed tubes. Tube diameter as well as tube bundle geometry were successfully implemented into useful correlations for predicting tube bundles' heat transfer of gas–solid fluidized bed systems operating with fine particles. KW - Fluidized bed KW - Lignite KW - Drying KW - Heat transfer KW - Horizontal tubes KW - Tube bundle Y1 - 2014 U6 - https://doi.org/10.1016/j.powtec.2013.10.041 IS - 253 SP - 14 EP - 21 ER - TY - CHAP A1 - Fischer, Ulrich A1 - Rabann, Bernd A1 - Krautz, Hans Joachim T1 - Wasserstoff – Elektrolyse T2 - Erneuerbare Energien : VBI-Leitfaden Y1 - 2015 SP - 85 EP - 92 PB - Verband Beratender Ingenieure CY - Berlin ET - 1. Auflage ER - TY - GEN A1 - Katzer, Christian A1 - Klatt, Matthias A1 - Lisk, Alexander A1 - Krautz, Hans Joachim T1 - Erste Untersuchungsergebnisse an einem elektrisch zündenden Kohlenstaubbrennersystem T2 - Verbrennung und Feuerung, 27. Deutscher Flammentag, Clausthal-Zellerfeld, 16. und 17. September 2015 Y1 - 2015 SN - 978-3-18-092267-6 SP - 17 EP - 28 PB - VDI-Verlag CY - Düsseldorf ER - TY - GEN A1 - Katzer, Christian A1 - Babul, Konrad A1 - Klatt, Matthias A1 - Krautz, Hans Joachim T1 - Quantitative und qualitative relationship between swirl burner operating conditions and pulverized coal flame length T2 - Fuel Processing Technology KW - Flame length KW - Flame stability KW - Swirl burner KW - Pulverized coal KW - Image processing Y1 - 2017 U6 - https://doi.org/10.1016/j.fuproc.2016.10.013 SN - 0378-3820 VL - 156 SP - 138 EP - 155 ER - TY - CHAP A1 - Ziems, Christian A1 - Fischer, Ulrich A1 - Krautz, Hans Joachim A1 - Luschtinetz, Thomas A1 - Lehmann, Jochen T1 - Project presentation-Novel 3D porous electrode materials for more efficient alkaline water electrolysis-AEL3D T2 - Nutzung regenerativer Energiequellen und Wasserstofftechnik 2016, 23. Symposium Nutzung Regenerativer Energiequellen und Wasserstofftechnik, Stralsund, 3. - 5. November 2016 Y1 - 2016 SN - 978-3-9817740-1-6 SP - 175 EP - 181 PB - Fachhochschule CY - Stralsund ER - TY - CHAP A1 - Fischer, Ulrich A1 - Tannert, Daniel A1 - Voigt, Andre A1 - Ziems, Christian A1 - Krautz, Hans Joachim A1 - Barz, Mirko A1 - Dinkler, Konstantin T1 - Renewable Energy Storage by Hydrogen Production from Water Electrolysis T2 - Technical and Economic Aspects of Renewable Energies - Know-How Transfer as Development Opportunity for Southern Europe Y1 - 2016 SN - 978-3-86387-721-7 SP - 118 EP - 126 PB - Mensch und Buch CY - Berlin ER - TY - CHAP A1 - Fischer, Ulrich A1 - Krautz, Hans Joachim A1 - Wenske, Michael A1 - Tannert, Daniel A1 - Krüger, Perco A1 - Ziems, Christian A1 - Stolten, Detlef A1 - Emonts, Bernd T1 - Hydrogen Hybrid Power Plant in Prenzlau, Brandenburg T2 - Hydrogen Science and Engineering - Materials, Processes, Systems and Technology, Bd. 2 Y1 - 2016 SN - 978-3-5273323-8-0 SP - 1033 EP - 1052 PB - Wiley-VCH CY - Weinheim ER - TY - CHAP A1 - Ziems, Christian A1 - Sakkas, Nikolaos Panagiotis A1 - Posselt, Joachim A1 - Krautz, Hans Joachim ED - Luschtinetz, Thomas ED - Lehmann, Jochen T1 - Development of algorithms for the deployment planning and control of power-to-heat systems for the more efficient use of renewable surplus energy – project details T2 - 24. Energiesymposium Symposium - Nutzung regenerativer Energiequellen und Wasserstofftechnik Y1 - 2017 SN - 978-3-9817740-3-0 SP - 194 EP - 211 PB - Stralsund CY - Hochschule, Inst. für Regenerative EnergieSysteme ER - TY - CHAP A1 - Guerrero, Cinthya A1 - Klatt, Matthias A1 - Krautz, Hans Joachim T1 - Energy transition in Germany: a case study on renewable energy integration and its impact in the operation and efficiency of coal-fired power plants T2 - Southern African Energy Efficiency Convention (SAEEC 2017), 14th and 15th November 2017, Gauteng, Südafrika Y1 - 2017 UR - http://www.saee.org.za/cproceedings2017.aspx#K SN - 978-0-6399125-0-9 ER - TY - GEN A1 - Mieck, Sebastian A1 - Krautz, Hans Joachim T1 - Systematic analysis and preparation of high resolution in-situ measurements for the estimation of PV module parameters T1 - Systematische Analyse und Aufbereitung von hoch-aufgelösten in-situ Messdaten für die Identifikation von Photovoltaik Modulparametern T2 - VGB PowerTech N2 - In the last two decades, a rapid expansion of photovoltaic (PV) power plants of different sizes has taken place. Along with this, the interest from science and industry is growing, exploring the strengths and weaknesses of this technology as well as further developing the efficiency in its production and operation. For planning and operating of PV power plants, valid energy yield forecasts are desirable. These forecasts are also important to draw conclusions for the monitoring of future PV technologies. The analysis, evaluation and processing of meteorological and technical measurement datasets play an essential role. In this article, high-resolution measurement data sets of a mobile, autarkic test system are analyzed firstly. The measured data are checked for plausibility and validity with the corresponding methods. After this observations and phenomena with meteorological cause are described. In a second step, a practicable procedure for the preparation of the measurement data is presented, in order to make it suitable for further calculations, e.g. identification of photovoltaic module parameters for energy yield calculations. The focus is particularly on the flexibility, adaptability and code performance of the processing procedure. Results, evaluations and outlooks on the methods used, measurement data and selected software packages are made. N2 - In den letzten zwei Dekaden ist ein rascher Zubau von Photovoltaik(PV)-Kraftwerken verschiedener Leistungsgrößen zu konstatieren. Damit einhergehend wächst das Interesse aus Wissenschaft und Wirtschaft, Stärken und Schwächen der Technologie zu ergründen sowie die Effizienz in Herstellung und Betrieb weiter zu entwickeln. Für Planung und Betrieb von PV-Kraftwerken sind z.B. valide Ertragsprognosen anzustreben, aber auch Rückschlüsse aus dem Monitoring für zukünftige PV-Technologien zu ziehen. Die Analyse, Auswertung und Verarbeitung von meteorologischen und technischen Messdatensätzen spielt dabei eine wesentliche Rolle. Im diesem Artikel werden zeitlich hoch aufgelöste Messdatensätze eines mobilen, autarken Testsystems in einem ersten Schritt analysiert. Dabei werden die Messdaten auf Plausibilität und Validität mit entsprechenden Methoden überprüft, spezielle Beobachtungen und Phänomene mit meteorologischer Ursache beschrieben. In einem zweiten Schritt wird eine praktikable Vorgehensweise für die Aufbereitung der Messdaten vorgestellt, um diese für weiterführende Berechnungen, z.B. Identifikation von Photovoltaik Modulparametern für Ertragsberechnungen, verfügbar zu machen. Im Vordergrund stehen insbesondere die Flexibilität, Adaptierbarkeit sowie Codeperformanz der Aufbereitungsprozedur. Es werden Ergebnisse, Einschätzungen und Ausblicke zu den verwendeten Methoden, Messdaten, sowie gewählter Software Pakete vorgenommen. KW - Photovoltaic KW - Data preparation Y1 - 2018 SN - 1435-3199 VL - 98 IS - 8 SP - 75 EP - 81 ER - TY - THES A1 - Ojong, Emile Tabu T1 - Characterization of the Performance of PEM Water Electrolysis Cells operating with and without Flow Channels, based on Experimentally Validated Semi-empirical Coupled-Physics Models N2 - PEM water electrolysis is a clean and efficient conversion technology for hydrogen production and energy storage, especially when coupled with renewable energy sources. In spite of its many advantages, the high component and cell manufacturing costs of the conventional PEM electrolysis cell makes the PEM water electrolysis technology commercially less competitive vis-à-vis its peers. An alternative and cost effective cell design has been proposed which has up to a 25 % costs advantage over the conventional cell. In this alternative cell design, the flow channel plate which bears the most material costs in the conventional cell design has been replaced with a 3-D Porous Transport Layer (PTL) structure. While both designs perform comparably the same at low to mid current density (0 – 2 A/cm²), it has been observed that the conventional cell by far out performs the low cost cell at high current density operations, due to increased mass transport limitation in the cell without flow channels. Since industrial and commercial hydrogen production efforts are focused towards high current density operation (> 3 A/cm²), it thus becomes obvious that, in order for the cost effective alternative cell design to establish itself over the conventional cell design, the mass transport issues at high current densities have to be well understood and described. This research work seeks to understand the source of, and to eliminate the mass transport losses in the cost effective alternative cell design in order to get it performing at least as good as the conventional cell design at current densities up to 5 A/cm². To meet this objective, 2-D non-isothermal semi-empirical fully-coupled models of both cell designs have been developed and experimentally validated. The developed validated models were then used as tools to simulate and predict the best operating conditions, design parameters and micro-structural properties of the PTL at which the mass transport issues in the design without flow channels will be at its minimum, so that both cells can exhibit comparable performance even at high current densities. The models developed in this work are based on a multi-physics approach in which thermodynamic, electrochemical, thermal and mass transport sub-models are coupled and solved numerically, to predict the cell polarization and individual overpotentials, as well as address heat and water management issues. The most unique aspect of this work however, is the development of own semi-empirical equations for predicting the mass transport overpotential imposed by the gas phase (bubbles) at high current densities. Also, for the very first time, calculated PEM water electrolysis polarization curves up to 5 A/cm² have been validated by own experimental data. The results show that, the operating temperature and pressure, inlet water flowrate and thickness of the PTL are the critical parameters for mitigating mass transport limitation at high current densities. In fact, it was found that, for the size of the cells studied (25 cm² active area each), when both cells are operating at the same temperature of 60 °C, the low cost cell design will have a comparable performance to the conventional designed cell even at 5 A/cm² current density when; the operating pressure is ≥ 5 bar, the feed water flowrate is ≥ 0.024l/min∙cm², PTL porosity is 50 %, PTL pore size is ≥ 11 µm and PTL thickness is 0.5 mm. At these operating, design and micro-structural conditions, the predicted difference between the polarizations of both cells will be only ~10 mV at 5 A/cm² operating current density. N2 - Die PEM Wasser Elektrolyse gilt als effiziente Technologie zur Herstellung von sauberem Wasserstoff zur Energiespeicherung, besonders bei Kopplung mit erneuerbaren Energien. Trotz der vielen Vorteile führen hohe Kosten für die Produktion konventioneller Komponenten und Stacks zu einer nicht konkurrenzfähigen Technologie. Ein alternatives und kostengünstiges Zelldesign wurde vorgestellt, das, verglichen mit einem konventionellen Design, einen Kostenvorteil von bis zu 25 % hervorbringt. Bei diesem alternativen Zelldesign wird die Platte mit Strömungskanälen, die den größten Kostenanteil birgt, durch eine 3-D poröse Struktur (engl. Porous transport layer, PTL) ersetzt. Während beide Designs vergleichbare Leistungsdaten im niederen und mittleren Stromdichtebereich zeigen (0 – 2 A/cm2), wurde ein signifikanter Unterschied im hohen Stromdichtebereich beobachtet. Hierbei zeigt ein Design ohne Strömungskanäle niedrigere Leistungsdaten, was durch eine gesteigerte Limitierung des Massentransportes erklärt werden kann. Da sich die industrielle und kommerzielle Wasserstoffproduktion in Richtung hoher Stromdichten (> 3 A/cm²) entwickelt, scheint das erforderliche Verständnis von Massentransporteffekten offensichtlich um das kosteneffiziente Design gegenüber des konventionellen Designs voran zu treiben. Diese Forschungsarbeit versucht den Ursprung von Massentransportlimitierung des kostengünstigen Zelldesigns zu verstehen und eliminieren, um zumindest entsprechende Leistungsdaten des konventionellen Designs bis 5 A/cm² zu erreichen. Um diese Zielvorgabe zu erreichen, wurden 2-D nicht-isotherme, semi-empirische, vollstaendig gekoppelte Modelle beider Zelldesigns entwickelt und experimentell validiert. Die entwickelten und validierten Modelle wurden als Werkzeug zur Simulation und Vorhersage der geeignetsten Betriebs- und Designparameter, sowie Eigenschaften der Mikrostrukur der PTL verwendet. Dabei sind die Verluste durch Massentransport, im Design ohne Strömungskanäle, minimal, sodass beide Designs vergleichbare Leistungsdaten bei hohen Stromdichten zeigen. Die hierin entwickelten Modelle basieren auf einem multiphysikalischen Ansatz, worin thermodynamische, elektrische und thermische Effekte sowie Massentransportuntermodelle gekoppelt und gelöst wurden, um sowohl die Zellpolarisation und individuelle Überpotentiale vorherzusagen, als auch Wärme- und Wassermanagement zu adressieren. Das Alleinstellungsmerkmal dieser Arbeit ist jedoch die Entwicklung von semi-empirischen Gleichungen, um die Überpotentiale der Massentransporthemmung, ausgehend von Gasblasen, vorhersagen zu können. Ebenso wurden zum ersten Mal berechnete PEM Wasser Elektrolyse Polarisationskurven bis zu einer Stromdichte von 5 A/cm² mit eigenen Daten validiert. Die Ergebnisse zeigen, dass Betriebstemperatur und Druck, sowie Wasserflußrate am Zelleingang und Dicke der PTL die kritischen Parameter sind, um Massentransportlimitierung bei hohen Stromdichten zu vermeiden. Es wurde sogar gezeigt, dass bei der verwendeten Zellgröße (aktive Fläche = 25 cm²) vergleichbare Leistungsdaten bei 60 °C und 5 A/cm² erreicht werden können, sofern der Betriebsdruck 5 bar übersteigt, die Flussrate des Eduktwassers größer als 0.024 l/min ist, die Porosität der PTL 50 % übersteigt, die Porendurchmesser größer als 11 µm sind und die PTL Dicke bei 0.5 mm liegt. Bei diesen Betriebsbedingungen, diesen Design- und Mikrostrukturparametern wurden Unterschiede zwischen den beiden Zelldesigns von etwa 10 mV bei 5 A/cm² vorhergesagt. KW - PEM Electrolysis KW - Porous Transport Layer KW - High Current Density KW - Mass Transport KW - Modelling KW - Experimental Validation Y1 - 2018 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:co1-opus4-46504 CY - Cottbus ; Senftenberg ER - TY - RPRT A1 - Klatt, Matthias A1 - Pfeiffer, Klaus A1 - Bendig, Martin A1 - Platta, Kristian A1 - Matzekat, David T1 - Betrachtungen zur Mindesterzeugung von Braunkohlekraftwerken im Kontext des Netzbetriebs Y1 - 2018 UR - https://mwe.brandenburg.de/media/bb1.a.3814.de/Studie_konventionelle_Mindesterzeugung_Endbericht.pdf PB - Brandenburgische Technische Universität, Fachgebiet Dezentrale Energiesysteme [u.a.] CY - Cottbus ; Senftenberg ER -