@article{Benim2022, author = {Benim, Ali Cemal}, title = {Introducing the "Mathematical Modelling and Numerical Simulation of Combustion and Fire" Section of the Journal Fire}, series = {fire}, volume = {5}, journal = {fire}, number = {6}, publisher = {MDPI}, issn = {2571-6255}, doi = {10.3390/fire5060178}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-40257}, year = {2022}, language = {en} } @article{PfeiffelmannOzmanBenimetal.2022, author = {Pfeiffelmann, Bjorn and Ozman, Cansu and Benim, Ali Cemal and Joos, Franz}, title = {Analysis of the effect of nonuniform surface temperature distribution on the performance of a thermoelectric generator}, series = {Sustainable Energy Technologies and Assessments}, volume = {53}, journal = {Sustainable Energy Technologies and Assessments}, number = {A}, publisher = {Elsevier}, issn = {2213-1388}, doi = {10.1016/j.seta.2022.102375}, year = {2022}, language = {en} } @article{AliFarooqShahzadetal.2022, author = {Ali, Ramzan and Farooq, A. and Shahzad, A. and Benim, Ali Cemal and Iqbal, A. and Razzaq, M.}, title = {Computational approach on three-dimensional flow of couple-stress fluid with convective boundary conditions}, series = {Physica A: Statistical Mechanics and its Applications}, volume = {553}, journal = {Physica A: Statistical Mechanics and its Applications}, publisher = {Elsevier}, issn = {0378-4371}, doi = {10.1016/j.physa.2019.124056}, year = {2022}, language = {en} } @inproceedings{Prusas2022, author = {Prusas, Benedik}, title = {Simulation of Germany's security of supply: long-term forecasting of electric load profiles using machine learning.}, series = {ENERDAY 2022 - 16th international conference of energy economics and technology, 30.9.2022, Dresden}, booktitle = {ENERDAY 2022 - 16th international conference of energy economics and technology, 30.9.2022, Dresden}, publisher = {Technische Universit{\"a}t Dresden}, address = {Dresden}, year = {2022}, language = {en} } @inproceedings{GroteRammSchoenig2022, author = {Grote-Ramm, Wolfgang and Sch{\"o}nig, Felix}, title = {Model Predictive Control of Solar Receivers}, series = {25th Cologne Solar Colloquium (DLR)}, booktitle = {25th Cologne Solar Colloquium (DLR)}, publisher = {DLR Institut f{\"u}r Solarforschung}, pages = {17}, year = {2022}, language = {en} } @inproceedings{DeckertMohya2022, author = {Deckert, Carsten and Mohya, Ahmed}, title = {Self-directed versus guided learning - searching for the sweet spot with lesson activities in Moodle}, series = {SEFI 50th Annual conference of The European Society for Engineering Education. "Towards a new future in engineering education, new scenarios that european alliances of tech universities open up."}, booktitle = {SEFI 50th Annual conference of The European Society for Engineering Education. "Towards a new future in engineering education, new scenarios that european alliances of tech universities open up."}, publisher = {Universitat Polit{\`e}cnica de Catalunya}, address = {Barcelona}, isbn = {978-84-123222-6-2}, doi = {10.5821/conference-9788412322262.1132}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-51759}, pages = {234 -- 242}, year = {2022}, abstract = {In times of a pandemic many university courses have to be taught in an online learning format to respect the requirements of social distancing. Online learning takes place between the poles of self-direction by the student and guidance by the lecturer. In this paper a first-semester course in industrial economics for engineers, which was taught in the self-directed learning format of flipped classroom, was enhanced with lesson activities in the Learning Management System (LMS) Moodle as a means of guided learning with student-content interaction. The paper describes the design and the evaluation of the lesson activities. For the evaluation a student survey to gather the opinions and self-assessments of the students was conducted, and statistical data from Moodle on the performance of the students were collected. The results of the student survey show an overall positive evaluation of the lesson activities by the students who participated in the lesson activities. Furthermore, the results of the statistical data about the students' performance show a relation between participation in the lesson activities and exam success. As a caveat, however, the results also show that the majority of the students chose not to participate in the lesson activities.}, subject = {Selbstgesteuertes Lernen}, language = {en} } @inproceedings{MuellerAdam2022, author = {M{\"u}ller, Benedikt and Adam, Mario}, title = {Multikriterielle Auslegung Deutschlands bislang gr{\"o}ßter solarthermischen Anlage zur Integration in ein Bestandsfernw{\"a}rmenetz}, series = {RET.Con 2022. - 5. Regenerative Energietechnik Konferenz, 10. - 11. Februar 2022, Nordhausen}, booktitle = {RET.Con 2022. - 5. Regenerative Energietechnik Konferenz, 10. - 11. Februar 2022, Nordhausen}, address = {Neuhausen}, organization = {HS Nordhausen}, year = {2022}, language = {de} } @article{PangNovelliKaminskietal.2022, author = {Pang, Jacky Yat Sing and Novelli, Anna and Kaminski, Martin and Acir, Ismail-Hakki and Bohn, Birger and Carlsson, Philip T. M. and Cho, Changmin and Dorn, Hans-Peter and Hofzumahaus, Andreas and Li, Xin and Lutz, Anna and Nehr, Sascha and Reimer, David and Rohrer, Franz and Tillmann, Ralf and Wegener, Robert and Kiendler-Scharr, Astrid and Wahner, Andreas and Fuchs, Hendrik}, title = {Investigation of the limonene photooxidation by OH at different NO concentrations in the atmospheric simulation chamber SAPHIR (Simulation of Atmospheric PHotochemistry In a large Reaction Chamber)}, series = {Atmospheric Chemistry and Physics}, volume = {22}, journal = {Atmospheric Chemistry and Physics}, number = {13}, publisher = {Copernicus}, issn = {1680-7324}, doi = {10.5194/acp-22-8497-2022}, pages = {8497 -- 8527}, year = {2022}, abstract = {Abstract. The oxidation of limonene by the hydroxyl (OH) radical and ozone (O3) was investigated in the atmospheric simulation chamber SAPHIR (Simulation of Atmospheric PHotochemistry In a large Reaction Chamber) in experiments performed at different nitric oxide (NO) mixing ratios from nearly 0 up to 10 ppbv. For the experiments dominated by OH oxidation, the formaldehyde (HCHO) yield was experimentally determined and found to be (12 ± 3), (13 ± 3), and (32 ± 5) \% for experiments with low (∼ 0.1 ppbv), medium (∼ 0.3 ppbv), and high NO (5 to 10 ppbv), respectively. The yield in an ozonolysis-only experiment was (10 ± 1) \%, which agrees with previous laboratory studies. The experimental yield of the first-generation organic nitrates from limonene-OH oxidation is calculated as (34 ± 5) \%, about 11 \% higher than the value in the Master Chemical Mechanism (MCM), which is derived from structure-activity relationships (SARs). Time series of measured radicals, trace-gas concentrations, and OH reactivity are compared to results from zero-dimensional chemical box model calculations applying MCM v3.3.1. Modeled OH reactivity is 5 to 10 s-1 (25 \% to 33 \% of the OH reactivity at the start of the experiment) higher than measured values at the end of the experiments under all chemical conditions investigated, suggesting either that there are unaccounted loss processes of limonene oxidation products or that products are less reactive toward OH. In addition, model calculations underestimate measured hydroperoxyl radical (HO2) concentrations by 20 \% to 90 \% and overestimate organic peroxyl radical (RO2) concentrations by 50 \% to 300 \%. The largest deviations are found in low-NO experiments and in the ozonolysis experiment. An OH radical budget analysis, which uses only measured quantities, shows that the budget is closed in most of the experiments. A similar budget analysis for RO2 radicals suggests that an additional RO2 loss rate constant of about (1-6) × 10-2 s-1 for first-generation RO2 is required to match the measured RO2 concentrations in all experiments. Sensitivity model runs indicate that additional reactions converting RO2 to HO2 at a rate constant of about (1.7-3.0) × 10-2 s-1 would improve the model-measurement agreement of NOx, HO2, and RO2 concentrations and OH reactivity. Reaction pathways that could lead to the production of additional OH and HO2 are discussed, which include isomerization reactions of RO2 from the oxidation of limonene, different branching ratios for the reaction of RO2 with HO2, and a faster rate constant for RO2 recombination reactions. As the exact chemical mechanisms of the additional HO2 and OH sources could not be identified, further work needs to focus on quantifying organic product species and organic peroxy radicals from limonene oxidation.}, language = {en} } @article{AlvarezCarslawDusanteretal.2022, author = {Alvarez, Elena G{\´o}mez and Carslaw, Nicola and Dusanter, S{\´e}bastien and Edwards, Pete and G{\´a}bor Mihucz, Viktor and Heard, Dwayne and Kleffmann, J{\"o}rg and Nehr, Sascha and Schoemacker, Coralie and Venables, Dean}, title = {Techniques for measuring indoor radicals and radical precursors}, series = {Applied Spectroscopy Reviews}, volume = {57}, journal = {Applied Spectroscopy Reviews}, number = {7}, publisher = {Informa UK Limited}, issn = {0570-4928}, doi = {10.1080/05704928.2022.2087666}, pages = {580 -- 624}, year = {2022}, abstract = {Radicals and their precursors play a central role in the chemical transformations occurring in indoor air and on indoor surfaces. Such species include OH, HO2, peroxy radicals, nitrous acid, reactive chlorine species, NO3, N2O5, Criegee intermediates, and glyoxal and methylglyoxal. Recent advances on instrumental analysis and modeling studies have demonstrated the need for a wider range of measurements of radical species and their precursors in indoor air. This work reviews measurement techniques and provides considerations for indoor measurements of several radicals and their precursors. Techniques to determine the actinic flux are also presented owing to the relevance of photolytically-initiated processes indoors. This review is also intended to provide pointers for those wanting to learn more about measurements of radicals indoors.}, language = {en} } @article{BausNehr2022, author = {Baus, Lukas and Nehr, Sascha}, title = {Potentials and limitations of direct air capturing in the built environment}, series = {Building and Environment}, volume = {208}, journal = {Building and Environment}, publisher = {Elsevier}, issn = {0360-1323}, doi = {10.1016/j.buildenv.2021.108629}, year = {2022}, abstract = {This concept study presents an approach for resolving the trade-off between energy-efficient building operation and the provision of hygienically harmless indoor air quality. A novel coupling of HVAC-systems (heating, ventilation and air conditioning systems) with DAC-technology (direct air capturing technology) is proposed to separate CO2 in the exhaust air of buildings and recirculate the CO2-depleted air back into the building. In a mainly theoretical approach, the corresponding potentials and limitations of the novel HVAC/DAC-coupling in recirculation mode are evaluated. For that purpose, CO2-loads in the feed and exhaust air of four buildings located in Germany were measured using calibrated non-dispersive infrared (NDIR) sensors with pyroelectric detection principle. Subsequent numerical model simulations resort to typical meteorological data as well as building operation parameters grouped in different scenarios. The measurement and simulation results were assessed with regard to: (i) the unique possibilities of a HVAC/DAC-coupling in recirculation mode for the improvement of indoor air quality, (ii) the energy saving potentials through reduced air conditioning requirements enabled by a HVAC/DAC-coupling in recirculation mode, and (iii) the potential allocation of CO2 separated from building exhaust air for energetic and/or material reutilization in decentralized systems. In conclusion, a HVAC/DAC-coupling in recirculation mode can not only reduce the energy demand of buildings but also facilitates access to unutilized CO2-resources transported in the built environment and additionally offers the potential to improve indoor air quality. However, a suitable DAC module for operation in indoor air is not yet commercially available.}, language = {en} } @inproceedings{BatosHellenbroichKieletal.2022, author = {Batos, Andrej and Hellenbroich, Jean Maurice and Kiel, J{\"u}rgen and Jahr, Andreas}, title = {Entwicklung einer smarten, elektronisch gesteuerten Dosiereinheit f{\"u}r den gezielten und sparsamen Einsatz von Pflanzenschutzmitteln}, series = {Fachtagung VDI MECHATRONIK 2022}, booktitle = {Fachtagung VDI MECHATRONIK 2022}, editor = {Bertram, Torsten and Corves, Burkhard and Janschek, Klaus and Rinderknecht, Stephan}, publisher = {Universit{\"a}ts- und Landesbibliothek Darmstadt}, address = {Darmstadt}, doi = {10.26083/TUPRINTS-00020963}, url = {http://nbn-resolving.de/urn:nbn:de:tuda-tuprints-209637}, year = {2022}, abstract = {Feldspritzen verf{\"u}gen {\"u}ber entlang eines Spritzgest{\"a}nges angebrachte D{\"u}sen, die ein Pflanzenschutzmittel-(PSM-)Tr{\"a}gerfl{\"u}ssigkeits-Gemisch verteilen. Da die D{\"u}sen nur ein PSM-Gemisch applizieren und h{\"a}ufig nicht einzeln ansteuerbar sind, wird nicht bedarfsgerecht verteilt und u. U. stellenweise zu wenig, zu viel oder nicht das optimale PSM appliziert. Dieser Beitrag stellt das Labormodell einer High-Speed-Dosiereinheit zur Vermischung dreier PSM mit der Tr{\"a}gerfl{\"u}ssigkeit vor, mit der Pflanzen individuell und mit der minimal n{\"o}tigen PSM-Menge behandelt werden. Sie arbeitet unabh{\"a}ngig vom hydraulischen System der Tr{\"a}gerfl{\"u}ssigkeit, ist reaktionsschnell und {\"u}beraus dosiergenau. Basierend auf einer Applikationskarte, die den Pflanzenstatus enth{\"a}lt, und der GPS-Position werden Ausbringvolumen, -zeitpunkt, -position und PSM-Art in einem ISOBUS-Terminal bestimmt und an ein Steuerger{\"a}t weitergegeben, das die Dosiereinheit ansteuert. Neben der neuentwickelten Hardware und Steuerung werden erste Pr{\"u}fstandergebnisse vorgestellt.}, language = {de} }