TY - CHAP A1 - Laux, Christoph A1 - Gotter, Andreas A1 - Neef, Matthias T1 - Experimental investigation of a low pressure steam Rankine cycle for waste heat utilization of internal combustion engines T2 - Proceedings of the 5th International Seminar on ORC Power Systems N2 - High heat losses via exhaust gas and coolant in internal combustion engines (ICE) are the basis for numerous investigations regarding downstream processes for power generation. The most promising concepts are Organic Rankine Cycles (ORC) and Steam Rankine Cycles (SRC). In previous work of the Center of Innovative Energy Systems, Düsseldorf (Germany), the technical and economic feasibility of a low pressure SRC has been investigated and the advantages in comparison to organic Rankine cycles are highlighted. A distinctive feature of the cycle is the use of the ICE coolant heat for evaporation, which limits the cycles maximum steam pressure to values below atmospheric pressure. This work presents first results of a test rig with data reconciliation according to DIN 2048 to validate the simulation results and design calculations. As a basis for the experimental investigations, a gas fired CHP plant was selected. The design of the test rig is optimized for the operation in the laboratory, where the coolant heat is emulated by a tempering device and the exhaust heat of the CHP plant is emulated by a gas burner. With the designed test rig, it is possible to control the volume flow and the temperatures of the coolant and exhaust gas, so that different load conditions of the gas fired CHP plant can be investigated. For initial tests, the turbine in the SRC is replaced by a throttle to achieve the pressure drop of the turbine. The experimental results show, that the exhaust and coolant heat of a 36 kWel CHP plant can be emulated and the performance expectations of the cycle can be met in stable steady-state conditions. Based on the measurement results and the turbine design calculations an electric power output of the cycle of 3.8 kW will be possible, which results in a cycle efficiency of about 6.5 % and an increase of the electrical power output of the CHP plant of about 10 %. The results show that the plant concept is technically feasible and, with further optimization, also represents an alternative to ORC plants in terms of increasing the efficiency of a cogeneration plant. Y1 - 2019 SN - 978-90-9032038-0 PB - The National Technical University of Athens (NTUA) CY - Athens ER - TY - CHAP A1 - Kramer, Tim A1 - Lerner, Igor A1 - Sacher, Patrick A1 - Neef, Matthias A1 - Baier, André ED - Dederichs-Koch, Andrea ED - Mohnert, Andrea ED - Kammasch, Gudrun T1 - Blue Engineering: Was ist das und wie gelingt die Implementierung an meiner Hochschule? T2 - Diversität und Kulturelle Vielfalt - Differenzieren, Individualisieren - oder Integrieren? Wege zu technischer Bildung : Referate der 13. Ingenieurpädagogischen Regionaltagung 2018 and der Hochschule Bochum vom 7.-9. Juni 2018 KW - Blue Engineering KW - Diversität Y1 - 2018 SN - 978-3-9818728-2-8 PB - Ingenieur-Pädagogische Wissensgesellschaft (IPW) CY - Berlin ER - TY - CHAP A1 - Neef, Matthias A1 - aus der Wiesche, Stefan ED - aus der Wiesche, Stefan ED - Joos, Franz T1 - Aufbau und Wirkungsweise von Dampfturbinen BT - Grundlagen, Konstruktion, Betrieb T2 - Handbuch Dampfturbinen KW - Turbinen Y1 - 2018 SN - 978-3-658-20629-1 U6 - https://doi.org/10.1007/978-3-658-20630-7_2 SP - 27 EP - 83 PB - Springer Fachmedien CY - Wiesbaden ER - TY - CHAP A1 - Feseker, Daniel A1 - Kinell, Mats A1 - Neef, Matthias ED - The American Society of Mechanical Engineers, T1 - Experimental Study on Pressure Losses in Circular Orifices With Inlet Cross Flow T2 - Proceedings of the ASME Turbo Expo: Turbine Technical Conference and Exposition - 2017: presented at the ASME Turbo Expo 2017: Turbine Technical Conference and Exposition, June 26-30, 2017 N2 - The ability to understand and predict the pressure losses of orifices is important in order to improve the air flow within the secondary air system. This experimental study investigates the behavior of the discharge coefficient for circular orifices with inlet cross flow which is a common flow case in gas turbines. Examples of this are at the inlet of a film cooling hole or the feeding of air to a blade through an orifice in a rotor disk. Measurements were conducted for a total number of 38 orifices, covering a wide range of length-to-diameter ratios, including short and long orifices with varying inlet geometries. Up to five different chamfer-to-diameter and radius-to-diameter ratios were tested per orifice length. Furthermore, the static pressure ratio across the orifice was varied between 1.05 and 1.6 for all examined orifices. The results of this comprehensive investigation demonstrate the beneficial influence of rounded inlet geometries and the ability to decrease pressure losses, which is especially true for higher cross flow ratios where the reduction of the pressure loss in comparison to sharp-edged holes can be as high as 54%. With some exceptions, the chamfered orifices show a similar behavior as the rounded ones but with generally lower discharge coefficients. Nevertheless, a chamfered inlet yields lower pressure losses than a sharp-edged inlet. The obtained experimental data were used to develop two correlations for the discharge coefficient as a function of geometrical as well as flow properties. Y1 - 2017 UR - https://asmedigitalcollection.asme.org/GT/proceedings/GT2017/50886/Charlotte, North Carolina, USA/241903 SN - 978-0-7918-5088-6 U6 - https://doi.org/10.1115/GT2017-64143 PB - The American Society of Mechanical Engineers CY - New York ER - TY - CHAP A1 - Frank, Lena A1 - Rödder, Maximilian A1 - Neef, Matthias A1 - Adam, Mario T1 - Heizung, Lüftung, Weiße Ware – ein integriertes Systemkonzept für das Haus der Zukunft T2 - Deutsche Kälte- und Klimatagung 2017 Bremen KW - Heizung KW - EnerTEG Y1 - 2017 SN - 9783932715938 SP - 1028 EP - 1041 CY - Stuttgart ER - TY - CHAP A1 - Neef, Matthias A1 - Zielke, Thomas A1 - Fussenecker, Claudia ED - Danish Network for Engineering Education, T1 - Engineering Conferences - An Innovative Course for Master Students in Engineering T2 - Exploring Teaching for Active Learning in Engineering Education N2 - This poster summarizes a few facts, figures and resources related to the Master course ”Engineering Conferences”. KW - Poster Y1 - 2017 SN - 978-87-998898-1-5 PB - Danish Network for Engineering Education (IUPN) CY - Odense ER - TY - CHAP A1 - Neef, Matthias A1 - Zielke, Thomas A1 - Fussenecker, Claudia ED - Danish Network for Engineering Education, T1 - Engineering Conferences - An Innovative Course for Master Students in Engineering T2 - Exploring Teaching for Active Learning in Engineering Education N2 - A course called "Engineering Conferences" is presented that the authors have developed and installed as a mandatory part of the curriculum in Master programs for engineering students. The idea is to go beyond teaching the standards of academic writing and skills for working with scientific publications. By using a learner-centered approach, we get the students engaged in typical activities around an active attendance of a real conference. They write a paper complying with common academic standards, submit the paper and review submissions of their fellow students. Students also produce a poster and have to defend it in a poster session held publicly on campus. In this article, we present our rationale to develop the course and our results from the first semester teaching this course. This includes the presentation of useful resources for teaching and organizing scientific publishing as well as our reflected learning experience regarding the student's understanding of significance for scientific publishing. KW - Engineering Conference Y1 - 2017 SN - 978-87-998898-1-5 SP - 13 EP - 24 CY - Odense ER - TY - CHAP A1 - Zielke, Thomas A1 - Neef, Matthias A1 - Fussenecker, Claudia T1 - Teaching Engineering Conferences T2 - Proceedings of the Canadian Engineering Education Association (CEEA) Conference N2 - This article is on a university course called Engineering Conferences. It has been developed by the authors and installed as a mandatory part of the curriculum in three master’s degree programs for engineering students. The participants of the course are postgraduates with different nationalities, mostly German, and different technical backgrounds. They study Mechanical Engineering, Simulation and Experimental Technology, or International Business Engineering. The basic idea of the course concept goes far beyond simply teaching the standards of academic writing and skills for using scientific publications. By using a learnercentered approach, the students get engaged in typical activities around an active attendance of a real conference. Students learn to locate the field of their bachelor thesis or project report in the world of research communities, scientific journals and engineering conferences. They learn about conferences matching their bachelor/project topic. They write a paper complying with common academic standards, submit it to a mock-up conference, and review submissions of their fellow students. Students also produce a poster and have to defend it in a poster session held publicly on the campus. Engineering Conferences is a course on scientific communication and presentation that also aims at the development of other skills and competences needed in the world of modern engineering. KW - Engineering Conferences Y1 - 2017 CY - Winnipeg ER - TY - CHAP A1 - Laux, Christoph A1 - Goebel, Johannes A1 - Neef, Matthias A1 - Gotter, Andreas T1 - Investigation in the Technical and Economic Feasibility of a Low-Pressure Steam Cycle for the Waste Heat Utilization of a Cogeneration Plant T2 - Proceedings of the ASME Turbo Expo: Turbine Technical Conference and Exposition - 2015 : presented at the ASME 2015 Turbo Expo: Turbine Technical Conference and Exposition, June 15 - 19, 2015, Montreal, Quebec, Canada / sponsored by the International Gas Turbine Institute N2 - This paper deals with the investigation in the technical and economic feasibility of a low-pressure steam cycle for the waste heat utilization of a combined heat and power (CHP) plant. The proposed steam cycle uses a pressure level below atmospheric pressure which allows to use the heat from the motor’s coolant for evaporation. The cycle is designed to increase the maximum electrical efficiency of a gas fired reciprocating engine and to increase operational flexibility for varying heat demand. Since organic Rankine cycle (ORC) plants are already being successfully used for waste heat recovery, advantages of the low-pressure steam Rankine cycle (SRC) over an ORC are highlighted. Many ORC fluids are toxic or flammable and thus have an increased risk potential compared to water. An additional advantage of water compared to ORC fluids is the possibility of superheating above 500 °C. The technical feasibility of the proposed cycle is studied by the detailed design of the individual system components such as turbine, heat exchangers and auxiliary parts. This includes the detailed thermodynamic design of the full cycle for the calculation of plant efficiencies. As a basis for future experimental investigations, a cogeneration plant with an electrical output of 50 kWel was selected as a heat source for the steam cycle. The design geometries of the turbine and the heat exchanger are presented along with efficiency and cost predictions. A subsonic radial turbine with a rotational speed of 155,000 rpm was selected. The maximum turbine output is about 7.5 kW. The use of a flash evaporator is investigated to reduce the size and the costs for the evaporator. The suggested steam cycle helps to increase the electrical efficiency of the CHP plant by 4.5% points from an original 36.5% to 41.0%. The steam cycle itself has an electrical efficiency of approximately 9%. Additionally, the condensation temperature in this steam cycle is high enough to be extracted as useful heat output to generate domestic water with a temperature of 50°C. Y1 - 2015 SN - 978-0-7918-5667-3 VL - 3: Coal, biomass and alternative fuels - cycle innovations - electric power - industrial and cogeneration PB - International Gas Turbine Institute (ASME) CY - New York ER - TY - CHAP A1 - Rödder, Maximilian A1 - Laux, Christoph A1 - Neef, Matthias T1 - Systematic fluid selection in early stages of ORC design: a practical engineering approach T2 - Proceedings of the ASME Turbo Expo: Turbine Technical Conference and Exposition - 2015 : presented at the ASME 2015 Turbo Expo: Turbine Technical Conference and Exposition, June 15 - 19, 2015, Montreal, Quebec, Canada / sponsored by the International Gas Turbine Institute Y1 - 2015 SN - 978-0-7918-5667-3 VL - 3: Coal, biomass and alternative fuels - cycle innovations - electric power - industrial and cogeneration PB - International Gas Turbine Institute (ASME) CY - New York ER - TY - CHAP A1 - Rödder, Maximilian A1 - Spiegel, Thomas A1 - Frank, Lena A1 - Neef, Matthias A1 - Adam, Mario ED - Großmann, Uwe ED - Kunold, Ingo T1 - Integration eines multifunktionalen Wärmepumpensystems als Hardware-in-the-Loop in ein Niederspannungsnetzmodell T2 - Smart Energy and Systems 2019: Digitalisierung - Anwendungen in Technik und Industriegesellschaft, 10. Fachtagung, 04.-05.11.2019, Dortmund KW - energiBUS4home Y1 - 2019 SP - 70 EP - 77 PB - vwh Verlag Werner Hülsbusch Fachverlag für Medientechnik und -wirtschaft CY - Glückstadt ER - TY - CHAP A1 - Neef, Matthias A1 - André, Baier T1 - Blue Engineering: Ingenieur_innen mit ökologischer und sozialer Verantwortung - ein Studierenden-getriebenes, modulares Seminar-Konzept T2 - DGHD-Jahrestagung KW - Poster Y1 - 2019 UR - https://www.researchgate.net/publication/331327194_Blue_Engineering_Ingenieur_innen_mit_okologischer_und_sozialer_Verantwortung_-_ein_Studierenden-getriebenes_modulares_Seminar-Konzept PB - Universität Leipzig CY - Leipzig ER - TY - RPRT A1 - Neef, Matthias A1 - Laux, Christoph T1 - Optimierung des elektrischen Nutzungsgrades eines Blockheizkraftwerks durch Abwärmeverwertung in einem nachgeschalteten Dampfkraftprozess N2 - Abschlussbericht Förderung: Bundesministerium für Bildung und Forschung (BMBF) Förderkennzeichen: 03FH006I2 Projektzeitraum: 31.08.2012 -31.08.2015 Y1 - 2016 U6 - https://doi.org/10.2314/GBV:867675985 CY - Düsseldorf ER - TY - JOUR A1 - Rödder, Maximilian A1 - Frank, Lena A1 - Kirschner, Daniel A1 - Neef, Matthias A1 - Adam, Mario T1 - EnergiBUS4home – Sustainable energy resourcing in low-energy buildings JF - Energy KW - energiBUS4home Y1 - 2018 U6 - https://doi.org/10.1016/j.energy.2018.06.145 N1 - PII: S0360544218312106 VL - 159 SP - 638 EP - 647 PB - Elsevier ER - TY - RPRT A1 - Adam, Mario A1 - Dreher, Martina A1 - Ebling, Dirk A1 - Knopp, Reinhold A1 - Neef, Matthias A1 - Niess, Robert A1 - Pohl, Tobias A1 - Stahl, Wilhelm A1 - van Rießen, Anne A1 - Waldow, Friederike A1 - Weber, Konradin A1 - Weis, Stephanie T1 - LUST Forschungsprojekt - lebenswerte und umweltgerechte Stadt N2 - LUST (lebenswerte und umweltgerechte Stadt) ist ein interdisziplinäres Projekt der Fachbereiche Architektur, Maschinenbau und Verfahrenstechnik sowie Kultur- und Sozialwissenschaften der Hochschule Düsseldorf. Mittelpunkt des Projektes ist die fachübergreifende Entwicklung neuer Konzepte für eine lebenswerte und umweltgerechte Stadt. Es wurde gefördert vom Land Nordrhein-Westfalen im Rahmen des Programms „FH Struktur“. N2 - LUST (Liveable and environment-friendly Urban SiTe) is an interdisciplinary project of the faculties of Architecture, Mechanical and Process Engineering as well as Social Studies and Cultural Sciences at the University of Applied Sciences Düsseldorf. The four-year (2013 – 2016) project is funded by the Ministry of Innovation, Science and Research of North Rhine–Westphalia. The aim is to develop holistic, new concepts for a liveable and environmentally friendly city in a multidisciplinary manner. KW - Stadtentwicklung KW - lebenswert KW - umweltgerecht KW - substainable urban development KW - environmentally friendly KW - liveable Y1 - 2017 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:due62-opus-11458 SN - 978-3-941334-43-4 CY - Düsseldorf ER - TY - JOUR A1 - Laux, Christoph A1 - Gotter, Andreas A1 - Eckert, Frank A1 - Neef, Matthias T1 - Experimental results of a low-pressure steam Rankine cycle with a novel water lubricated radial inflow turbine for the waste heat utilization of internal combustion engines JF - Energy Conversion and Management Y1 - 2022 U6 - https://doi.org/10.1016/j.enconman.2022.116265 SN - 0196-8904 VL - 271 PB - Elsevier ER - TY - CHAP A1 - Jäger, Lukas A1 - Hart, Scott A1 - Reguera, Remo A1 - Grote-Ramm, Wolfgang A1 - Neef, Matthias T1 - Autonome Nachführungssteuerung eines Parabolrinnen-Teststands mittels Microcontroller T2 - Beitrag zur 7. Regenerativen Energietechnik Konferenz, Nordhausen, 08. - 09. Februar 2024 N2 - Parabolrinnen nutzen parabolisch gekrümmte Spiegel, um die direkte Globalstrahlung auf ein Vakuum-Absorberrohr zu konzentrieren. Eine Effizienzsteigerung dieser Technologie wird durch eine vollständige Automatisierung der Sonnennachführung optimiert. Die an einem Parabolrinnen-Versuchsträger der Hochschule Düsseldorf realisierte Steuerung und Berechnung der Nachführung werden kontinuierlich über einen Microcontroller realisiert. Eine Kalibrierung der Parabolrinne im Labormaßstab zur Erkennung des Winkels erfolgt über Infrarotsensoren. Die Berechnung des Sonnenstandes, durch den Algorithmus, kann unabhängig von einer Stromzufuhr durch eine Real-Time-Clock bestimmt werden. Mittels Schrittmotor und Treiber verfährt die Parabolrinne in die errechnete Position. Die Feinausrichtung der Parabolrinne erfolgt über ein Verschattungsmodul und zwei Photowiderstände. Durch den Einsatz von 3D-gedruckten Bestandteilen sind die genutzten Komponenten kostengünstig und können standortunabhängig reproduziert werden. Durch das Zusammenspiel der Komponenten ist ein autonomer Einsatz möglich. KW - Parabolrinnen KW - Sonnenenergie KW - Microcontroller Y1 - 2024 CY - Nordhausen ER -