@inproceedings{LauxGoebelNeefetal.2015, author = {Laux, Christoph and Goebel, Johannes and Neef, Matthias and Gotter, Andreas}, title = {Investigation in the Technical and Economic Feasibility of a Low-Pressure Steam Cycle for the Waste Heat Utilization of a Cogeneration Plant}, series = {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}, volume = {3: Coal, biomass and alternative fuels - cycle innovations - electric power - industrial and cogeneration}, booktitle = {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}, publisher = {International Gas Turbine Institute (ASME)}, address = {New York}, isbn = {978-0-7918-5667-3}, year = {2015}, abstract = {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.}, language = {en} } @incollection{RoedderLauxNeef2015, author = {R{\"o}dder, Maximilian and Laux, Christoph and Neef, Matthias}, title = {Systematic fluid selection in early stages of ORC design: a practical engineering approach}, series = {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}, volume = {3: Coal, biomass and alternative fuels - cycle innovations - electric power - industrial and cogeneration}, booktitle = {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}, publisher = {International Gas Turbine Institute (ASME)}, address = {New York}, isbn = {978-0-7918-5667-3}, year = {2015}, language = {en} } @inproceedings{RoedderSpiegelFranketal.2019, author = {R{\"o}dder, Maximilian and Spiegel, Thomas and Frank, Lena and Neef, Matthias and Adam, Mario}, title = {Integration eines multifunktionalen W{\"a}rmepumpensystems als Hardware-in-the-Loop in ein Niederspannungsnetzmodell}, series = {Smart Energy and Systems 2019: Digitalisierung - Anwendungen in Technik und Industriegesellschaft, 10. Fachtagung, 04.-05.11.2019, Dortmund}, booktitle = {Smart Energy and Systems 2019: Digitalisierung - Anwendungen in Technik und Industriegesellschaft, 10. Fachtagung, 04.-05.11.2019, Dortmund}, editor = {Großmann, Uwe and Kunold, Ingo}, publisher = {vwh Verlag Werner H{\"u}lsbusch Fachverlag f{\"u}r Medientechnik und -wirtschaft}, address = {Gl{\"u}ckstadt}, pages = {70 -- 77}, year = {2019}, language = {de} } @inproceedings{NeefAndre2019, author = {Neef, Matthias and Andr{\´e}, Baier}, title = {Blue Engineering: Ingenieur_innen mit {\"o}kologischer und sozialer Verantwortung - ein Studierenden-getriebenes, modulares Seminar-Konzept}, series = {DGHD-Jahrestagung}, booktitle = {DGHD-Jahrestagung}, publisher = {Universit{\"a}t Leipzig}, address = {Leipzig}, organization = {Universit{\"a}t Leipzig}, year = {2019}, language = {de} } @techreport{NeefLaux2016, author = {Neef, Matthias and Laux, Christoph}, title = {Optimierung des elektrischen Nutzungsgrades eines Blockheizkraftwerks durch Abw{\"a}rmeverwertung in einem nachgeschalteten Dampfkraftprozess}, address = {D{\"u}sseldorf}, organization = {Hochschule D{\"u}sseldorf}, doi = {10.2314/GBV:867675985}, year = {2016}, abstract = {Abschlussbericht F{\"o}rderung: Bundesministerium f{\"u}r Bildung und Forschung (BMBF) F{\"o}rderkennzeichen: 03FH006I2 Projektzeitraum: 31.08.2012 -31.08.2015}, language = {de} } @article{RoedderFrankKirschneretal.2018, author = {R{\"o}dder, Maximilian and Frank, Lena and Kirschner, Daniel and Neef, Matthias and Adam, Mario}, title = {EnergiBUS4home - Sustainable energy resourcing in low-energy buildings}, series = {Energy}, volume = {159}, journal = {Energy}, publisher = {Elsevier}, doi = {10.1016/j.energy.2018.06.145}, pages = {638 -- 647}, year = {2018}, language = {en} } @techreport{AdamDreherEblingetal.2017, author = {Adam, Mario and Dreher, Martina and Ebling, Dirk and Knopp, Reinhold and Neef, Matthias and Niess, Robert and Pohl, Tobias and Stahl, Wilhelm and van Rießen, Anne and Waldow, Friederike and Weber, Konradin and Weis, Stephanie}, title = {LUST Forschungsprojekt - lebenswerte und umweltgerechte Stadt}, address = {D{\"u}sseldorf}, organization = {Hochschule D{\"u}sseldorf}, isbn = {978-3-941334-43-4}, doi = {10.20385/978-3-941334-43-4}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-11458}, year = {2017}, abstract = {LUST (lebenswerte und umweltgerechte Stadt) ist ein interdisziplin{\"a}res Projekt der Fachbereiche Architektur, Maschinenbau und Verfahrenstechnik sowie Kultur- und Sozialwissenschaften der Hochschule D{\"u}sseldorf. Mittelpunkt des Projektes ist die fach{\"u}bergreifende Entwicklung neuer Konzepte f{\"u}r eine lebenswerte und umweltgerechte Stadt. Es wurde gef{\"o}rdert vom Land Nordrhein-Westfalen im Rahmen des Programms „FH Struktur".}, language = {de} } @article{LauxGotterEckertetal.2022, author = {Laux, Christoph and Gotter, Andreas and Eckert, Frank and Neef, Matthias}, title = {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}, series = {Energy Conversion and Management}, volume = {271}, journal = {Energy Conversion and Management}, publisher = {Elsevier}, issn = {0196-8904}, doi = {10.1016/j.enconman.2022.116265}, year = {2022}, language = {en} } @inproceedings{JaegerHartRegueraetal.2024, author = {J{\"a}ger, Lukas and Hart, Scott and Reguera, Remo and Grote-Ramm, Wolfgang and Neef, Matthias}, title = {Autonome Nachf{\"u}hrungssteuerung eines Parabolrinnen-Teststands mittels Microcontroller}, series = {Beitrag zur 7. Regenerativen Energietechnik Konferenz, Nordhausen, 08. - 09. Februar 2024}, booktitle = {Beitrag zur 7. Regenerativen Energietechnik Konferenz, Nordhausen, 08. - 09. Februar 2024}, address = {Nordhausen}, pages = {8}, year = {2024}, abstract = {Parabolrinnen nutzen parabolisch gekr{\"u}mmte Spiegel, um die direkte Globalstrahlung auf ein Vakuum-Absorberrohr zu konzentrieren. Eine Effizienzsteigerung dieser Technologie wird durch eine vollst{\"a}ndige Automatisierung der Sonnennachf{\"u}hrung optimiert. Die an einem Parabolrinnen-Versuchstr{\"a}ger der Hochschule D{\"u}sseldorf realisierte Steuerung und Berechnung der Nachf{\"u}hrung werden kontinuierlich {\"u}ber einen Microcontroller realisiert. Eine Kalibrierung der Parabolrinne im Labormaßstab zur Erkennung des Winkels erfolgt {\"u}ber Infrarotsensoren. Die Berechnung des Sonnenstandes, durch den Algorithmus, kann unabh{\"a}ngig von einer Stromzufuhr durch eine Real-Time-Clock bestimmt werden. Mittels Schrittmotor und Treiber verf{\"a}hrt die Parabolrinne in die errechnete Position. Die Feinausrichtung der Parabolrinne erfolgt {\"u}ber ein Verschattungsmodul und zwei Photowiderst{\"a}nde. Durch den Einsatz von 3D-gedruckten Bestandteilen sind die genutzten Komponenten kosteng{\"u}nstig und k{\"o}nnen standortunabh{\"a}ngig reproduziert werden. Durch das Zusammenspiel der Komponenten ist ein autonomer Einsatz m{\"o}glich.}, language = {de} }