@inproceedings{BungSchlenkhoff2008, author = {Bung, Daniel B. and Schlenkhoff, Andreas}, title = {Optimization of the reaeration potential on embankment stepped spillways in skimming flow regime}, series = {Hydraulic structures : proceedings of the second International Junior Researcher and Engineer Workshop on Hydraulic Structures, Pisa, Italy, 30 July-1 August 2008}, booktitle = {Hydraulic structures : proceedings of the second International Junior Researcher and Engineer Workshop on Hydraulic Structures, Pisa, Italy, 30 July-1 August 2008}, editor = {Pagliara, Stefano}, organization = {International Junior Researcher and Engineer Workshop on Hydraulic Structures <2, 2008, Pisa>}, isbn = {978-88-8492-568-8}, pages = {97 -- 106}, year = {2008}, language = {en} } @inproceedings{Bung2009, author = {Bung, Daniel B.}, title = {Optimierung des potentiellen Sauerstoffeintrags auf Treppenschussrinnen mit gem{\"a}ßigter Neigung}, series = {9. JuWi-Treffen : Beitr{\"a}ge zum Treffen junger Wissenschaftlerinnen und junger Wissenschaftler deutschsprachiger Wasserbauinstitute}, booktitle = {9. JuWi-Treffen : Beitr{\"a}ge zum Treffen junger Wissenschaftlerinnen und junger Wissenschaftler deutschsprachiger Wasserbauinstitute}, editor = {Theobald, S.}, publisher = {Universit{\"a}t Kassel}, address = {Kassel}, pages = {73 -- 78}, year = {2009}, language = {de} } @techreport{HoeflerGross2016, author = {H{\"o}fler, Matthias and Groß, Rolf Fritz}, title = {Optimierung der Oxidationskinetik von Sulfit zu Sulfat durch effiziente feinblasige Bel{\"u}ftung bei Anlagen zur Rauchgasentschwefelung fossil befeuerter Kraftwerke und Industrieanlagen mittels Seewasser ("Optiox")}, pages = {1 Seite}, year = {2016}, abstract = {Das Forschungsvorhaben Optiox besch{\"a}ftigt sich mit der Optimierung eines Bel{\"u}ftungsbeckens zur Rauchgasentschwefelung fossil befeuerter Kraftwerke mittels Seewasser. Unter Neutralisierung der entstehenden Hydroniumionen (H3O+) durch die nat{\"u}rliche Alkalit{\"a}t des Seewassers dissoziiert Schwefeldioxid aus dem Rauchgase im vorgeschalteten Absorber beim Phasen{\"u}bergang von der Gas- in die Fl{\"u}ssigphase zu Sulfiten. Im Bel{\"u}ftungsbecken werden diese Sulfite mittels eingeblasener Luft zu Sulfaten oxidiert, was zu einer geringen Erh{\"o}hung der Sulfatfracht vor Einleitung ins Meer f{\"u}hrt, die unterhalb der nat{\"u}rlichen Schwankungen liegt. Daneben dient das Bel{\"u}ftungsbecken der Konditionierung des Seewassers hinsichtlich pH-Wert und Sauerstoffgehalt und ist mit hoch effizienten Bel{\"u}ftern ausgestattet, deren Spezifikation den jeweiligen Randbedingungen, wie Abscheideleistung des Absorbers, Beckengeometrie sowie lokalen Gegebenheiten angepasst wird.}, language = {de} } @article{HoettgesRitterbachEls1987, author = {H{\"o}ttges, J{\"o}rg and Ritterbach, E. and Els, H.}, title = {Optical Improvement of LDV-Measurement in Pipe Flow / Ritterbach, E.; J. H{\"o}ttges; H. Els}, series = {Laser anemometry : advances and applications; proceedings of the 2. International Conference, Strathclyde, Scotland, 21st to 23rd September 1987 / ed. by John Turner ... UK LDA Users Group}, journal = {Laser anemometry : advances and applications; proceedings of the 2. International Conference, Strathclyde, Scotland, 21st to 23rd September 1987 / ed. by John Turner ... UK LDA Users Group}, publisher = {Springer}, address = {Berlin [u.a.]}, isbn = {3540187561}, pages = {VII, 601 S : Ill., graph. Darst.}, year = {1987}, language = {en} } @article{BungValero2016, author = {Bung, Daniel B. and Valero, Daniel}, title = {Optical flow estimation in aerated flows}, series = {Journal of Hydraulic Research}, volume = {54}, journal = {Journal of Hydraulic Research}, number = {5}, publisher = {Taylor \& Francis}, address = {London}, doi = {10.1080/00221686.2016.1173600}, pages = {575 -- 580}, year = {2016}, abstract = {Optical flow estimation is known from Computer Vision where it is used to determine obstacle movements through a sequence of images following an assumption of brightness conservation. This paper presents the first study on application of the optical flow method to aerated stepped spillway flows. For this purpose, the flow is captured with a high-speed camera and illuminated with a synchronized LED light source. The flow velocities, obtained using a basic Horn-Schunck method for estimation of the optical flow coupled with an image pyramid multi-resolution approach for image filtering, compare well with data from intrusive conductivity probe measurements. Application of the Horn-Schunck method yields densely populated flow field data sets with velocity information for every pixel. It is found that the image pyramid approach has the most significant effect on the accuracy compared to other image processing techniques. However, the final results show some dependency on the pixel intensity distribution, with better accuracy found for grey values between 100 and 150.}, language = {en} } @inproceedings{MohanGrossMenzeletal.2021, author = {Mohan, Nijanthan and Groß, Rolf Fritz and Menzel, Karsten and Theis, Fabian}, title = {Opportunities and Challenges in the Implementation of Building Information Modeling for Prefabrication of Heating, Ventilation and Air Conditioning Systems in Small and Medium-Sized Contracting Companies in Germany - A Case Study}, series = {WIT Transactions on The Built Environment, Vol. 205}, booktitle = {WIT Transactions on The Built Environment, Vol. 205}, publisher = {WIT Press}, address = {Southampton}, issn = {1743-3509}, doi = {10.2495/BIM210101}, pages = {117 -- 126}, year = {2021}, abstract = {FEven though BIM (Building Information Modelling) is successfully implemented in most of the world, it is still in the early stages in Germany, since the stakeholders are sceptical of its reliability and efficiency. The purpose of this paper is to analyse the opportunities and obstacles to implementing BIM for prefabrication. Among all other advantages of BIM, prefabrication is chosen for this paper because it plays a vital role in creating an impact on the time and cost factors of a construction project. The project stakeholders and participants can explicitly observe the positive impact of prefabrication, which enables the breakthrough of the scepticism factor among the small-scale construction companies. The analysis consists of the development of a process workflow for implementing prefabrication in building construction followed by a practical approach, which was executed with two case studies. It was planned in such a way that, the first case study gives a first-hand experience for the workers at the site on the BIM model so that they can make much use of the created BIM model, which is a better representation compared to the traditional 2D plan. The main aim of the first case study is to create a belief in the implementation of BIM Models, which was succeeded by the execution of offshore prefabrication in the second case study. Based on the case studies, the time analysis was made and it is inferred that the implementation of BIM for prefabrication can reduce construction time, ensures minimal wastes, better accuracy, less problem-solving at the construction site. It was observed that this process requires more planning time, better communication between different disciplines, which was the major obstacle for successful implementation. This paper was carried out from the perspective of small and medium-sized mechanical contracting companies for the private building sector in Germany.}, language = {en} } @article{CheenakulaPaulsenOttetal.2023, author = {Cheenakula, Dheeraja and Paulsen, Svea and Ott, Fabian and Gr{\"o}mping, Markus}, title = {Operational window of a deammonifying sludge for mainstream application in a municipal wastewater treatment plant}, series = {Water and Environment Journal}, journal = {Water and Environment Journal}, number = {Early View}, publisher = {Wiley}, address = {Chichester}, issn = {1747-6593}, doi = {10.1111/wej.12898}, pages = {1 -- 12}, year = {2023}, abstract = {The present work aimed to study the mainstream feasibility of the deammonifying sludge of side stream of municipal wastewater treatment plant (MWWTP) in Kaster, Germany. For this purpose, the deammonifying sludge available at the side stream was investigated for nitrogen (N) removal with respect to the operational factors temperature (15-30°C), pH value (6.0-8.0) and chemical oxygen demand (COD)/N ratio (≤1.5-6.0). The highest and lowest N-removal rates of 0.13 and 0.045 kg/(m³ d) are achieved at 30 and 15°C, respectively. Different conditions of pH and COD/N ratios in the SBRs of Partial nitritation/anammox (PN/A) significantly influenced both the metabolic processes and associated N-removal rates. The scientific insights gained from the current work signifies the possibility of mainstream PN/A at WWTPs. The current study forms a solid basis of operational window for the upcoming semi-technical trails to be conducted prior to the full-scale mainstream PN/A at WWTP Kaster and WWTPs globally.}, language = {en} } @inproceedings{DuranParedesMottaghyHerrmannetal.2020, author = {Duran Paredes, Ludwin and Mottaghy, Darius and Herrmann, Ulf and Groß, Rolf Fritz}, title = {Online ground temperature and soil moisture monitoring of a shallow geothermal system with non-conventional components}, series = {EGU General Assembly 2020}, booktitle = {EGU General Assembly 2020}, year = {2020}, abstract = {We present first results from a newly developed monitoring station for a closed loop geothermal heat pump test installation at our campus, consisting of helix coils and plate heat exchangers, as well as an ice-store system. There are more than 40 temperature sensors and several soil moisture content sensors distributed around the system, allowing a detailed monitoring under different operating conditions.In the view of the modern development of renewable energies along with the newly concepts known as Internet of Things and Industry 4.0 (high-tech strategy from the German government), we created a user-friendly web application, which will connect the things (sensors) with the open network (www). Besides other advantages, this allows a continuous remote monitoring of the data from the numerous sensors at an arbitrary sampling rate.Based on the recorded data, we will also present first results from numerical simulations, taking into account all relevant heat transport processes.The aim is to improve the understanding of these processes and their influence on the thermal behavior of shallow geothermal systems in the unsaturated zone. This will in turn facilitate the prediction of the performance of these systems and therefore yield an improvement in their dimensioning when designing a specific shallow geothermal installation.}, language = {en} } @incollection{GrossThulfautRenz2000, author = {Groß, Rolf Fritz and Thulfaut, Christian and Renz, Ulrich}, title = {On-Line Simulation mit LabView: Experimentelle und numerische Analyse homogener Gasphasenreaktionen aus Kraftwerksprozessen,}, series = {Virtuelle Instrumente in der Praxis. Begleitband zum Kongress VIP 2000}, booktitle = {Virtuelle Instrumente in der Praxis. Begleitband zum Kongress VIP 2000}, editor = {Jamal, Rahman and Jaschinski, Hans}, publisher = {H{\"u}thig}, address = {Heidelberg}, isbn = {3-7785-2789-4 (print)}, pages = {103 -- 108}, year = {2000}, abstract = {The institute of heat transfer and air conditioning at the Aachen University of Technology operates several test facilities in order to investigate homogeneous and catalytical processes for the reduction of gaseous pollutants (e.g. nitrous oxide) of flue gases in a tempeature range up to 900°C. One test facility consists of a stainless steel reactor in which the influence of reducing additives can be investigated. The software tool, created with LabVIEW 5.01, offers the possibility to measure, visualize and control all relevant physical quantities and to gain a numerical solution of the problem by solving the one dimensional, steady state conservation equations.}, language = {de} } @book{Kirsch2009, author = {Kirsch, Ansgar}, title = {On the face stability of shallow tunnels in sand. (Advances in geotechnical engineering and tunnelling ; 16)}, publisher = {Logos-Verl.}, address = {Berlin}, isbn = {978-3-8325-2149-3}, pages = {210 S.}, year = {2009}, language = {de} } @article{ZhangValeroBungetal.2018, author = {Zhang, G. and Valero, Daniel and Bung, Daniel B. and Chanson, H.}, title = {On the estimation of free-surface turbulence using ultrasonic sensors}, series = {Flow Measurement and Instrumentation}, volume = {60}, journal = {Flow Measurement and Instrumentation}, publisher = {Elsevier}, address = {Amsterdam}, issn = {0955-5986}, doi = {10.1016/j.flowmeasinst.2018.02.009}, pages = {171 -- 184}, year = {2018}, abstract = {Accurate determination of free-surface dynamics has attracted much research attention during the past decade and has important applications in many environmental and water related areas. In this study, the free-surface dynamics in several turbulent flows commonly found in nature were investigated using a synchronised setup consisting of an ultrasonic sensor and a high-speed video camera. Basic sensor capabilities were examined in dry conditions to allow for a better characterisation of the present sensor model. The ultrasonic sensor was found to adequately reproduce free-surface dynamics up to the second order, especially in two-dimensional scenarios with the most energetic modes in the low frequency range. The sensor frequency response was satisfactory in the sub-20 Hz band, and its signal quality may be further improved by low-pass filtering prior to digitisation. The application of the USS to characterise entrapped air in high-velocity flows is also discussed.}, language = {en} } @inproceedings{Bung2014, author = {Bung, Daniel B.}, title = {Observations on non-aerated flow and air entrainment on moderately sloped stepped spillways}, series = {7th Chinese-German Joint Symposium on Hydraulic and Ocean Engineering : 8. - 12. Sept. 2014, Hannover}, booktitle = {7th Chinese-German Joint Symposium on Hydraulic and Ocean Engineering : 8. - 12. Sept. 2014, Hannover}, organization = {Chinese-German Joint Symposium on Hydraulic and Ocean Engineering <7, 2014, Hannover>}, pages = {1 -- 8}, year = {2014}, language = {en} } @inproceedings{MuellerFischer2009, author = {M{\"u}ller, Karsten and Fischer, B.}, title = {Objective condition assessment of sewer systems}, series = {Strategic asset management of water supply and wastewater infrastructures : invited papers from the 2nd IWA Leading Edge Conference on Strategic Asset Management (LESAM), Lisbon, October [17 - 19] 2007 / ed. by Helene Alegre and Maria do C{\´e}u Almeida}, booktitle = {Strategic asset management of water supply and wastewater infrastructures : invited papers from the 2nd IWA Leading Edge Conference on Strategic Asset Management (LESAM), Lisbon, October [17 - 19] 2007 / ed. by Helene Alegre and Maria do C{\´e}u Almeida}, publisher = {IWA Publ.}, address = {London}, isbn = {9781843391869}, pages = {521 -- 534}, year = {2009}, language = {en} } @techreport{Doering1997, author = {D{\"o}ring, Bernd}, title = {Nutzung erneuerbarer Energien in Landesbauten : Dokumentation realisierter und geplanter Anlagen}, publisher = {Landesinstitut f{\"u}r Bauwesen des Landes Nordrhein-Westfalen}, address = {Aachen}, isbn = {3-930860-51-1}, pages = {66 S.}, year = {1997}, language = {de} } @article{RegerKuhnhenneEbbertetal.2020, author = {Reger, Vitali and Kuhnhenne, Markus and Ebbert, Thiemo and Hachul, Helmut and Blanke, Tobias and D{\"o}ring, Bernd}, title = {Nutzung erneuerbarer Energien durch thermische Aktivierung von Komponenten aus Stahl}, series = {Stahlbau}, volume = {2020}, journal = {Stahlbau}, number = {Volume 89, Issue 6512-519}, publisher = {Ernst \& Sohn}, address = {Berlin}, issn = {1437-1049}, doi = {10.1002/stab.202000031}, pages = {512 -- 519}, year = {2020}, abstract = {Die Versorgung von Neubauten soll m{\"o}glichst weitgehend unabh{\"a}ngig von fossilen Energietr{\"a}gern erfolgen. Erneuerbare Energien spielen daf{\"u}r eine gewichtige Rolle. Eine gute M{\"o}glichkeit, erneuerbare Energien ohne viel zus{\"a}tzlichen Aufwand nutzbar zu machen, ist, bereits vorhandenen Komponenten im Geb{\"a}ude zus{\"a}tzliche Funktionen zu geben. Hier kann bspw. die Fassade oder das Dach solarthermisch aktiviert oder durch Fotovoltaikmodule erg{\"a}nzt werden. Auch Tiefgr{\"u}ndungen k{\"o}nnen neben der statischen Funktion noch eine geothermische Funktion zur Aufnahme oder Abgabe von W{\"a}rme erhalten. Neben der Erzeugung bietet sich auch f{\"u}r die Verteilung der W{\"a}rme oder K{\"a}lte im Geb{\"a}ude die Integration in Bauteile an. Hier kann bspw. der Boden durch eine Fußbodenheizung oder die Decke durch Deckenstrahlplatten aktiviert werden. Im Rahmen der Ver{\"o}ffentlichung wird auf die thermische Aktivierung von Stahlkomponenten eingegangen. Es wird eine L{\"o}sung vorgestellt, die vorgeh{\"a}ngte hinterl{\"u}ftete Stahlfassade (VHF) solarthermisch zu aktivieren. Außerdem werden zwei M{\"o}glichkeiten zur geothermischen Aktivierung von Tiefgr{\"u}ndungen mittels Stahlpf{\"a}hlen gezeigt. Zuletzt wird ein System zur thermischen Aktivierung von Stahltrapezprofilen an der Decke erl{\"a}utert, welches W{\"a}rme zuf{\"u}hren oder bei Bedarf abf{\"u}hren kann.}, language = {de} } @article{HolthausSellheierBlecken2008, author = {Holthaus-Sellheier, Ursula and Blecken, Udo}, title = {Nutzenkosten: DIN 18960-2008 - Leistungsf{\"a}hige Grundlage f{\"u}r die zielorientierte Planung der Lebenszykluskosten / Blecken, Udo ; Holthaus-Sellheier, Ursula}, series = {Bautechnik. 85 (2008), H. 7}, journal = {Bautechnik. 85 (2008), H. 7}, isbn = {1437-0999}, pages = {464 -- 471}, year = {2008}, language = {de} } @article{GieseKirschZiegler2006, author = {Giese, S. and Kirsch, Ansgar and Ziegler, M.}, title = {Numerische Untersuchung von Schervorg{\"a}ngen mit der Diskrete-Partikel-Methode}, series = {Bauingenieur : die richtungsweisende Zeitschrift im Bauingenieurswesen ; offizielle Zeitschrift der VDI-Gesellschaft Bautechnik}, volume = {Bd. 81}, journal = {Bauingenieur : die richtungsweisende Zeitschrift im Bauingenieurswesen ; offizielle Zeitschrift der VDI-Gesellschaft Bautechnik}, number = {H. 5}, issn = {0005-6650}, pages = {232 -- 239}, year = {2006}, language = {de} } @article{KirschPiazzi2009, author = {Kirsch, Ansgar and Piazzi, Lukas}, title = {Numerical investigation of the effectiveness of a bored pile wall for the minimisation of settlement resulting from tunnel driving}, series = {Geomechanics and tunnelling}, volume = {Vol. 2}, journal = {Geomechanics and tunnelling}, number = {Iss. 6}, issn = {1865-7362}, doi = {10.1002/geot.200900063}, pages = {753 -- 765}, year = {2009}, language = {de} } @article{OertelBung2015, author = {Oertel, Mario and Bung, Daniel B.}, title = {Numerische Str{\"o}mungssimulationen von Fließgew{\"a}ssern : Praxisanwendungen und zuk{\"u}nftige Entwicklungen}, series = {Korrespondenz Wasserwirtschaft : KW}, volume = {8}, journal = {Korrespondenz Wasserwirtschaft : KW}, number = {H. 3}, publisher = {Gesellschaft zur F{\"o}rderung der Abwassertechnik}, address = {Hennef}, issn = {1616-430X}, pages = {177 -- 182}, year = {2015}, language = {de} } @inproceedings{OertelBung2014, author = {Oertel, Mario and Bung, Daniel B.}, title = {Numerische Str{\"o}mungssimulation von Fließgew{\"a}ssern - Wo stehen wir und was werden wir im Laufe der n{\"a}chsten Jahre erreichen?}, series = {Simulationsverfahren und Modelle f{\"u}r Wasserbau und Wasserwirtschaft = Simulation techniques and models for hydraulic engineering and water management / 37. Dresdner Wasserbaukolloquium 2014, 13. - 14. M{\"a}rz 2014. (Dresdner wasserbauliche Mitteilungen ; H. 50)}, booktitle = {Simulationsverfahren und Modelle f{\"u}r Wasserbau und Wasserwirtschaft = Simulation techniques and models for hydraulic engineering and water management / 37. Dresdner Wasserbaukolloquium 2014, 13. - 14. M{\"a}rz 2014. (Dresdner wasserbauliche Mitteilungen ; H. 50)}, organization = {Dresdner Wasserbaukolloquium <37, 2014>}, isbn = {978-3-86780-349-6}, pages = {19 -- 30}, year = {2014}, language = {de} }