TY  - CHAP
A1  - Stollenwerk, Dominik
A1  - Kuvarakul, T.
A1  - Kuperjans, Isabel
T1  - Renewable energy supply for power dominated, energy intense production processes - a systematic conversion approach for the anodizing process
T2  - IOP conference series: Earth and environmental science (EES)
Y1  - 2013
SN  - 1755-1315
SN  - 1755-1307
VL  - Vol. 16
IS  - H. 1
SP  - 012142/1
EP  - 012142/4
ER  - 
TY  - CHAP
A1  - Kumaran, P.
A1  - Gopinathan, M.
A1  - Razali, N. M.
A1  - Kuperjans, Isabel
A1  - Hariffin, B.
A1  - Hamdan, H.
T1  - Preliminary evaluation of atomization characteristics of improved biodiesel for gas turbine application
T2  - IOP Conference Series: Earth and Environmental Science (EES)
Y1  - 2013
U6  - http://dx.doi.org/10.1088/1755-1315/16/1/012014
SN  - 1755-1315
VL  - 16
IS  - 1
SP  - 012014/1
EP  - 012014/4
PB  - Institute of Physics Publishing (IOP)
CY  - London [u.a.]
ER  - 
TY  - CHAP
A1  - Augenstein, Eckardt
A1  - Gürzenich, D.
A1  - Kuperjans, Isabel
A1  - Wrobel, G.
T1  - TOP-Energy : softwaregestützte Analyse und Optimierung industrieller Energieversorgungssysteme
T2  - Entwicklungslinien der Energietechnik 2004
Y1  - 2004
N1  - Themengebiet Energiesysteme
PB  - VDI
CY  - Düsseldorf
ET  - CD-ROM-Ausg.
ER  - 
TY  - CHAP
A1  - Bouvy, C.
A1  - Kuperjans, Isabel
T1  - Mikro-Gasturbinen : eine neue Technologie zur Kraft-Wärme-Kopplung in kleinen und mittleren Unternehmen
T2  - Entwicklungslinien der Energietechnik 2004
Y1  - 2004
N1  - Themengebiet Rationelle Energieverwendung
PB  - VDI-Verlag
CY  - Düsseldorf
ET  - CD-ROM-Ausg.
ER  - 
TY  - CHAP
A1  - Augenstein, Eckardt
A1  - Herbergs, S.
A1  - Kuperjans, Isabel
T1  - Planung und Bewertung der Gebäudeenergieversorgung mit TOP-Energy
T2  - Heizungs- und Raumlufttechnik : 1. Fachtagung Leonberg, 31. Januar bis 1. Februar 2006. - (VDI-Berichte ; Nr. 1921)
Y1  - 2006
SN  - 3-18-091921-3
N1  - Posterbeitrag
SP  - 57
EP  - 60
PB  - VDI-Verl.
CY  - Düsseldorf
ER  - 
TY  - JOUR
A1  - Pauksztat, Anja
A1  - Kuperjans, Isabel
A1  - Meyer, Jörg
T1  - Formeln statt Zahlen : Referenzwerte Formeln zur energetischen Bewertung von Produktionsanlagen
JF  - BWK : das Energie-Fachmagazin
Y1  - 2005
SN  - 0006-9612
SN  - 1618-193X
VL  - 57
IS  - 12
SP  - 52
EP  - 55
ER  - 
TY  - JOUR
A1  - Kuperjans, Isabel
A1  - Gürzenich, D.
A1  - Roosen, P.
T1  - Kostenfunktionen im WWW : Unterstützung der Auslegung energietechnischer Anlagen und deren Verschaltungen
JF  - Gaswärme international (GWI)
Y1  - 2005
SN  - 0020-9384
VL  - 54
IS  - 1
SP  - 19
EP  - 21
ER  - 
TY  - JOUR
A1  - Kuperjans, Isabel
T1  - Exergetische und exergoökonomische Analyse thermischer Prozesse
JF  - Arbeitsbericht / Institut für Wirtschaftswissenschaften, Rheinisch-Westfälische Technische Hochschule Aachen
Y1  - 1996
IS  - 06
ER  - 
TY  - CHAP
A1  - Augenstein, Eckardt
A1  - Herbergs, S.
A1  - Kuperjans, Isabel
T1  - TOP-Energy : softwaregestützte Analyse und Optimierung industrieller Energieversorgungssysteme ; Postershow
T2  - Optimierung in der Energiewirtschaft : Tagung Stuttgart, 27. und 28. Oktober 2005. - (VDI-Berichte ; 1908)
Y1  - 2005
SN  - 3-18-091908-6
SP  - 279
EP  - 282
PB  - VDI-Verl.
CY  - Düsseldorf
ER  - 
TY  - JOUR
A1  - Pauksztat, Anja
A1  - Kuperjans, Isabel
A1  - Meyer, Jörg
T1  - Produktbezogene Referenzwerte für Energieeffizienz und CO2-Emissionen
JF  - Energiewirtschaftliche Tagesfragen : et ; Zeitschrift für Energiewirtschaft, Recht, Technik und Umwelt
Y1  - 2005
SN  - 0013-743X
SN  - 0720-6240
VL  - 55
IS  - 6
SP  - 374
EP  - 376
ER  - 
TY  - CHAP
A1  - Augenstein, Eckardt
A1  - Kuperjans, Isabel
A1  - Lucas, K.
ED  - Tsatsaronis,, Georgios
T1  - EUSEBIA - Decision-Support-System for Technical, Economical and Ecological Design and Evaluation of Industrial Energy Systems
T2  - ECOS 2002 : proceedings of the 15th International Conference on Efficiency, Costs, Optimization, Simulation and Environmental Impact of Energy Systems, Berlin, Germany July 3 - 5, 2002. - Vol. 1
Y1  - 2002
SN  - 3-00-009533-0
SP  - 446
EP  - 453
PB  - Techn. Univ., Inst. for Energy Engineering
CY  - Berlin
ER  - 
TY  - CHAP
A1  - Augenstein, Eckardt
A1  - Herbergs, S.
A1  - Kuperjans, Isabel
A1  - Lucas, K.
ED  - Kjelstrup, Signe
T1  - Simulation of industrial energy supply systems with integrated cost optimization
T2  - Proceedings of ECOS 2005, the 18th International Conference on Efficiency, Cost, Optimization, Simulation, and Environmental Impact of Energy Systems : Trondheim, Norway, June 20 - 22, 2005. - Vol. 2
Y1  - 2005
SN  - 82-519-2041-8
N1  - CD-ROM-Ausg. u.d.T.: Shaping our future energy systems
SP  - 627
EP  - 634
PB  - Tapir Academic Press
CY  - Trondheim
ER  - 
TY  - CHAP
A1  - Kuperjans, Isabel
A1  - Augenstein, Eckardt
T1  - „EUSEBIA – Software zur Analyse und Verbesserung der betrieblichen Energiewirtschaft
T2  - Optimierung in der Energieversorgung : Tagung Veitshöchheim, 9. und 10. Oktober 2001. - (VDI-Berichte ; 1627)
Y1  - 2001
SN  - 3-18-091627-3
SP  - 267
EP  - 268
PB  - VDI-Verl.
CY  - Düsseldorf
ER  - 
TY  - CHAP
A1  - Augenstein, Eckardt
A1  - Kuperjans, Isabel
T1  - Softwaregestützte Analyse und Konzeption betrieblicher Energieversorgungsanlagen
T2  - Fortschrittliche Energiewandlung und -anwendung : Schwerpunkt: dezentrale Energiesysteme ; Tagung Bochum, 13. und 14. März 2001. - (VDI-Berichte ; 1594)
Y1  - 2001
SN  - 3-18-091594-3
SP  - 313
EP  - 322
PB  - VDI-Verl.
CY  - Düsseldorf
ER  - 
TY  - CHAP
A1  - Knoche, K. F.
A1  - Kruska, Martin
A1  - Weber, P.
A1  - Kuperjans, Isabel
ED  - Schulz, Werner F.
T1  - Energiemanagement
T2  - Lexikon Nachhaltiges Wirtschaften. - (Lehr- und Handbücher zur ökologischen Unternehmensführung und Umweltökonomie)
Y1  - 2001
SN  - 3-486-24523-6
SP  - 88
EP  - 92
PB  - Oldenbourg
CY  - München [u.a.]
ER  - 
TY  - THES
A1  - Kuperjans, Isabel
T1  - Verfahren zur Analyse und Bewertung industrieller Energieanlagen
Y1  - 2000
N1  - Aachen, Techn. Hochsch., Diss., 2000
CY  - Aachen
ER  - 
TY  - CHAP
A1  - Kaspar, K.
A1  - Groebel, Simone
A1  - Kuperjans, Isabel
A1  - Dielmann, Klaus-Peter
A1  - Selmer, Thorsten
T1  - Charakterisierung der Biozönose von Biogasfermentern in Abhängigkeit verschiedener Substrate
T2  - Biogas 2013 : 6. Innovationskongress, 23. - 24.05.2013, Osnabrück, Tagungsband
Y1  - 2013
SN  - 978-3-9813776-3-7
SP  - 69
EP  - 74
PB  - Profair Consult+Project
CY  - Hildesheim
ER  - 
TY  - CHAP
A1  - Küppers, Christine
A1  - Groebel, Simone
A1  - Kuperjans, Isabel
A1  - Dielmann, Klaus-Peter
T1  - Molekulargenetische Analysen zur Optimierung der Biogasgewinnung
T2  - Biogas 2011 : 4. Innovationskongress ; Effizienzsteigerung von Biogasanlagen ; Vorstellung der 17 besten Biogas-Innovationen der letzten 12 Monate ; 12. - 13. Mai 2011, im ZUK der Deutschen Bundesstiftung Umwelt ; Tagungsband
Y1  - 2011
SN  - 978-3-9813776-1-3
SP  - 45
EP  - 48
PB  - Profair Consult+Project
CY  - Hildesheim
ER  - 
TY  - JOUR
A1  - Kuperjans, Isabel
A1  - Starke, M.
A1  - Esser, J.
A1  - [u.a.], 
T1  - Analyse und Konzeption von Energieanlagen unter ökologischen, wirtschaftlichen und technischen Gesichtspunkten
JF  - WLB : Umwelttechnik für Industrie und Kommune
Y1  - 2000
SN  - 0341-2679
VL  - 44
IS  - 11/12
SP  - 26
EP  - 29
ER  - 
TY  - JOUR
A1  - Kuperjans, Isabel
A1  - Esser, J.
A1  - Meyer, Jörg
A1  - Donner, O.
T1  - Gestaltung und Bewertung von Energieanlagen unter ökologischen, wirtschaftlichen und technischen Gesichtspunkten
JF  - Umweltwirtschaftsforum : UWF
Y1  - 2000
SN  - 0943-3481
VL  - 8
IS  - 3
SP  - 53
EP  - 58
ER  - 
TY  - CHAP
A1  - Kuperjans, Isabel
ED  - Bourg, Dominique
ED  - Erkman, Suren
T1  - Decision-support-system for technical, economical and ecological design and evaluation of industrial energy systems
T2  - Industrial ecology and sustainability : conferences and workshops ; September 22 - 25, 1999, Troyes, France
Y1  - 2000
PB  - Université de technologie de Troyes Genève : Institute for communication and analysis of science and technology
CY  - [Troyes]
ER  - 
TY  - CHAP
A1  - Kuperjans, Isabel
A1  - Terpitz, J.
A1  - Terruhn, H.
A1  - Wilhelm, H.-G.
T1  - Simulation zur Konzeption und Analyse betrieblicher und kommunaler Nahwärmesysteme
T2  - Betriebliches Energiemanagement : Tagung Cottbus, 30. und 31. März 1999. - (VDI-Berichte ; 1462)
Y1  - 1999
SN  - 3-18-091462-9
SP  - 195
EP  - 204
PB  - VDI-Verl.
CY  - Düsseldorf
ER  - 
TY  - CHAP
A1  - Kruska, Martin
A1  - Kuperjans, Isabel
T1  - Análisis Thermodinámicos : [Capítulo 3.3]
T2  - Uso racional de energía : eficiencia energética y energías renovables. - (Manual para consultores y expertos)
Y1  - 1999
SP  - 3.3-1
EP  - 3.3-15
PB  - Ministerio de Energía y Minas
CY  - Lima
ER  - 
TY  - CHAP
A1  - Kuperjans, Isabel
A1  - Seitz, C.-W.
A1  - Wilhelm, H.-G.
T1  - Realisierung einer Fernwärmeversorgung mit Kraft-Wärme-Kopplung für den Wohnwertpark Brühl
T2  - Energiemanagement in Kommunen und öffentlichen Einrichtungen : Tagung Stuttgart, 16. und 17. September 1998. - (VDI-Berichte ; 1424)
Y1  - 1998
SN  - 3-18-091424-6
SP  - 129
EP  - 138
PB  - VDI-Verl.
CY  - Düsseldorf
ER  - 
TY  - CHAP
A1  - Kuperjans, Isabel
A1  - Schreiber, M.
A1  - Determann, L.
A1  - Schreiber, R.
T1  - Entscheidungsunterstützung bei der Gestaltung der betrieblichen Energieversorgung und -nutzung
T2  - Innovationen bei der rationellen Energieanwendung : neue Chancen für die Wirtschaft ; Tagung Dortmund, 3. und 4. März 1998. - (VDI-Berichte ; 1385)
Y1  - 1998
SN  - 3-18-091385-1
SP  - 79
EP  - 94
PB  - VDI-Verl.
CY  - Düsseldorf
ER  - 
TY  - CHAP
A1  - Pauksztat, Anja
A1  - Kuperjans, Isabel
A1  - de Hesselle, M.
T1  - Referenzformeln für Energiebedarf und CO2-Emissionen in der Glasindustrie
T2  - Energieeffizienz - Chancen für die Zukunft : Tagung Berlin, 14. und 15. November 2006. - (VDI-Berichte ; 1951)
Y1  - 2006
SN  - 3-18-091951-5
SP  - 179
EP  - 190
PB  - VDI-Verl.
CY  - Düsseldorf
ET  - Nichtred. Ms.-Dr.
ER  - 
TY  - JOUR
A1  - Kuperjans, Isabel
T1  - Gute Planung ist alles : Energieeffizienz in der Pharmaproduktion
JF  - Pharma + Food
Y1  - 2011
SN  - 1434-8942
VL  - 2011
IS  - 2
SP  - 8
EP  - 10
PB  - Hüthig
CY  - Heidelberg
ER  - 
TY  - JOUR
A1  - Augenstein, Eckardt
A1  - Herbergs, S.
A1  - Kuperjans, Isabel
T1  - TOP-Energy : ein Werkzeug zur Optimierung der Gebäudeenergieversorgung
JF  - KI : Kälte, Luft, Klimatechnik
Y1  - 2006
SN  - 1865-5432
IS  - 5
SP  - 198
EP  - 201
ER  - 
TY  - JOUR
A1  - Kuperjans, Isabel
A1  - Weitzel, J.
T1  - Energiedesign 2020 : Sichere Strom- und Wärmeversorgung für die Industrie
JF  - TAB: das Fachmedium der TGA-Branche
Y1  - 2015
SN  - 0341-2032
IS  - 3
SP  - 105
EP  - 107
PB  - Bauverlag
CY  - Gütersloh
ER  - 
TY  - CHAP
A1  - Kasper, Katharina
A1  - Schiffels, Johannes
A1  - Krafft, Simone
A1  - Kuperjans, Isabel
A1  - Elbers, Gereon
A1  - Selmer, Thorsten
T1  - Biogas Production on Demand Regulated by Butyric Acid Addition
T2  - IOP Conference Series: Earth and Environmental Science. Bd. 32
Y1  - 2016
U6  - http://dx.doi.org/10.1088/1755-1315/32/1/012009
SN  - 1755-1315
N1  - ICARET 2016, International Conference on Advances in Renewable Energy and Technologies, Putrajaya, MY, Feb 23-25, 2016
VL  - 32
SP  - 012009/1
EP  - 012009/4
ER  - 
TY  - JOUR
A1  - Jablonowski, Nicolai David
A1  - Kollmann, Tobias
A1  - Nabel, Moritz
A1  - Damm, Tatjana
A1  - Klose, Holger
A1  - Müller, Michael
A1  - Bläsing, Marc
A1  - Seebold, Sören
A1  - Krafft, Simone
A1  - Kuperjans, Isabel
A1  - Dahmen, Markus
A1  - Schurr, Ulrich
T1  - Valorization of Sida (Sida hermaphrodita) biomass for multiple energy purposes
JF  - GCB [Global Change Biology] Bioenergy
N2  - The performance and biomass yield of the perennial energy plant Sida hermaphrodita (hereafter referred to as Sida) as a feedstock for biogas and solid fuel was evaluated throughout one entire growing period at agricultural field conditions. A Sida plant development code was established to allow comparison of the plant growth stages and biomass composition. Four scenarios were evaluated to determine the use of Sida biomass with regard to plant development and harvest time: (i) one harvest for solid fuel only; (ii) one harvest for biogas production only; (iii) one harvest for biogas production, followed by a harvest of the regrown biomass for solid fuel; and (iv) two consecutive harvests for biogas production. To determine Sida's value as a feedstock for combustion, we assessed the caloric value, the ash quality, and melting point with regard to DIN EN ISO norms. The results showed highest total dry biomass yields of max. 25 t ha⁻¹, whereas the highest dry matter of 70% to 80% was obtained at the end of the growing period. Scenario (i) clearly indicated the highest energy recovery, accounting for 439 288 MJ ha⁻¹; the energy recovery of the four scenarios from highest to lowest followed this order: (i) ≫ (iii) ≫ (iv) > (ii). Analysis of the Sida ashes showed a high melting point of >1500 °C, associated with a net calorific value of 16.5–17.2 MJ kg⁻¹. All prerequisites for DIN EN ISO norms were achieved, indicating Sida's advantage as a solid energy carrier without any post-treatment after harvesting. Cell wall analysis of the stems showed a constant lignin content after sampling week 16 (July), whereas cellulose had already reached a plateau in sampling week 4 (April). The results highlight Sida as a promising woody, perennial plant, providing biomass for flexible and multipurpose energy applications.
Y1  - 2016
U6  - http://dx.doi.org/10.1111/gcbb.12346
SN  - 1757-1707 (online)
SN  - 1757-1693 (print)
N1  - Special Issue: Perennial biomass crops for a resource constrained world
VL  - 9
IS  - 1
SP  - 202
EP  - 214
PB  - Wiley-VCH
CY  - Weinheim
ER  - 
TY  - CHAP
A1  - Rupp, Matthias
A1  - Kuperjans, Isabel
A1  - Schulze, Sven
ED  - Berns, Karsten
T1  - Energetische und ökologische Bewertung hybrider Antriebe im städtischen Busverkehr
T2  - Commercial vehicle technology 2016 : proceedings of the 4th Commercial Vehicle Technology Symposium (CVT 2016), March 8-10, 2016, University of Kaiserslautern, Kaiserslautern, Germany
N2  - In Anbetracht weltweit zunehmend strengerer klimapolitischer
Ziele steigt auch der Druck für Nutzfahrzeughersteller, effizientere und umweltfreundlichere
Technologien zu entwickeln. Den Blick bei der Bewertung dieser
ausschließlich auf die Fahrzeugnutzung zu richten, ist längst nicht mehr zufriedenstellend.
Im Rahmen dieser Analyse wird ein gegenwärtig auf dem Markt erwerblicher
und in deutschen Städten bereits seit Jahren betriebener Hybridbus
energetisch und ökologisch mit einem konventionell angetriebenen, nahezu baugleichen
Modell entlang des Lebensweges bewertet.
Nach Definition von Ziel und Untersuchungsrahmen wird ein Überblick auf bereits
durchgeführte Lebenszyklusanalysen zu Hybridbussen im Stadtverkehr gegeben
und Schlussfolgerungen für die anschließende Analyse abgeleitet. Diese
wird im Rahmen einer energetischen und ökologischen Bewertung beider Produktsysteme
anhand der Parameter "Primärenergieeinsatz" und "CO2äq Emissionen"
praktiziert. Der Fahrzeugrumpf beider Fahrzeuge des gleichen Modells
wird dabei als einheitlich angenommen, sodass bei dem Vergleich der Herstellung
vereinfacht nur die sich unterscheidenden Komponenten des Antriebstranges
berücksichtigt werden. Die Resultate der Wirkungsabschätzung werden als
Differenz des Hybridbusses gegenüber dem Referenzfahrzeug über die einzelnen
Lebenszyklusphasen dargestellt. Schließlich werden Prognosen getroffen, ab
welcher Strecke die bei der Herstellung erzeugten höheren CO2äq Emissionen
des Hybridantriebstranges gegenüber dem Referenzmodell ausgeglichen werden.
Y1  - 2016
SP  - 227
EP  - 237
PB  - Shaker
CY  - Aachen
ER  - 
TY  - JOUR
A1  - Rupp, Matthias
A1  - Schulze, Sven
A1  - Kuperjans, Isabel
T1  - Comparative life cycle analysis of conventional and hybrid heavy-duty trucks
JF  - World electric vehicle journal
N2  - Heavy-duty trucks are one of the main contributors to greenhouse gas emissions in German traffic. Drivetrain electrification is an option to reduce tailpipe emissions by increasing energy conversion efficiency. To evaluate the vehicle’s environmental impacts, it is necessary to consider the entire life cycle. In addition to the daily use, it is also necessary to include the impact of production and disposal. This study presents the comparative life cycle analysis of a parallel hybrid and a conventional heavy-duty truck in long-haul operation. Assuming a uniform vehicle glider, only the differing parts of both drivetrains are taken into account to calculate the environmental burdens of the production. The use phase is modeled by a backward simulation in MATLAB/Simulink considering a characteristic driving cycle. A break-even analysis is conducted to show at what mileage the larger CO2eq emissions due to the production of the electric drivetrain are compensated. The effect of parameter variation on the break-even mileage is investigated by a sensitivity analysis. The results of this analysis show the difference in CO2eq/t km is negative, indicating that the hybrid vehicle releases 4.34 g CO2eq/t km over a lifetime fewer emissions compared to the diesel truck. The break-even analysis also emphasizes the advantages of the electrified drivetrain, compensating the larger emissions generated during production after already a distance of 15,800 km (approx. 1.5 months of operation time). The intersection coordinates, distance, and CO2eq, strongly depend on fuel, emissions for battery production and the driving profile, which lead to nearly all parameter variations showing an increase in break-even distance.
Y1  - 2018
U6  - http://dx.doi.org/10.3390/wevj9020033
SN  - 2032-6653
VL  - 9
IS  - 2
SP  - Article No. 33
PB  - MDPI
CY  - Basel
ER  - 
TY  - JOUR
A1  - Rupp, Matthias
A1  - Handschuh, Nils
A1  - Rieke, Christian
A1  - Kuperjans, Isabel
T1  - Contribution of country-specific electricity mix and charging time to environmental impact of battery electric vehicles: A case study of electric buses in Germany
JF  - Applied Energy
Y1  - 2019
U6  - http://dx.doi.org/10.1016/j.apenergy.2019.01.059
SN  - 0306-2619
VL  - 237
SP  - 618
EP  - 634
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Hoffstadt, Kevin
A1  - Pohen, Gino D.
A1  - Dicke, Max D.
A1  - Paulsen, Svea
A1  - Krafft, Simone
A1  - Zang, Joachim W.
A1  - Fonseca-Zang, Warde A. da
A1  - Leite, Athaydes
A1  - Kuperjans, Isabel
T1  - Challenges and prospects of biogas from energy cane as supplement to bioethanol production
JF  - Agronomy
N2  - Innovative breeds of sugar cane yield up to 2.5 times as much organic matter as conventional breeds, resulting in a great potential for biogas production. The use of biogas production as a complementary solution to conventional and second-generation ethanol production in Brazil may increase the energy produced per hectare in the sugarcane sector. Herein, it was demonstrated that through ensiling, energy cane can be conserved for six months; the stored cane can then be fed into a continuous biogas process. This approach is necessary to achieve year-round biogas production at an industrial scale. Batch tests revealed specific biogas potentials between 400 and 600 LN/kgVS for both the ensiled and non-ensiled energy cane, and the specific biogas potential of a continuous biogas process fed with ensiled energy cane was in the same range. Peak biogas losses through ensiling of up to 27% after six months were observed. Finally, compared with second-generation ethanol production using energy cane, the results indicated that biogas production from energy cane may lead to higher energy yields per hectare, with an average energy yield of up to 162 MWh/ha. Finally, the Farm²CBG concept is introduced, showing an approach for decentralized biogas production.
Y1  - 2020
U6  - http://dx.doi.org/10.3390/agronomy10060821
SN  - 2073-4395
VL  - 10
IS  - 6
PB  - MDPI
CY  - Basel
ER  - 
TY  - JOUR
A1  - Cheenakula, Dheeraja
A1  - Hoffstadt, Kevin
A1  - Krafft, Simone
A1  - Reinecke, Diana
A1  - Klose, Holger
A1  - Kuperjans, Isabel
A1  - Grömping, Markus
T1  - Anaerobic digestion of algal–bacterial biomass of an Algal Turf Scrubber system
JF  - Biomass Conversion and Biorefinery
N2  - This study investigated the anaerobic digestion of an algal–bacterial biofilm grown in artificial wastewater in an Algal Turf Scrubber (ATS). The ATS system was located in a greenhouse (50°54′19ʺN, 6°24′55ʺE, Germany) and was exposed to seasonal conditions during the experiment period. The methane (CH4) potential of untreated algal–bacterial biofilm (UAB) and thermally pretreated biofilm (PAB) using different microbial inocula was determined by anaerobic batch fermentation. Methane productivity of UAB differed significantly between microbial inocula of digested wastepaper, a mixture of manure and maize silage, anaerobic sewage sludge, and percolated green waste. UAB using sewage sludge as inoculum showed the highest methane productivity. The share of methane in biogas was dependent on inoculum. Using PAB, a strong positive impact on methane productivity was identified for the digested wastepaper (116.4%) and a mixture of manure and maize silage (107.4%) inocula. By contrast, the methane yield was significantly reduced for the digested anaerobic sewage sludge (50.6%) and percolated green waste (43.5%) inocula. To further evaluate the potential of algal–bacterial biofilm for biogas production in wastewater treatment and biogas plants in a circular bioeconomy, scale-up calculations were conducted. It was found that a 0.116 km2 ATS would be required in an average municipal wastewater treatment plant which can be viewed as problematic in terms of space consumption. However, a substantial amount of energy surplus (4.7–12.5 MWh a−1) can be gained through the addition of algal–bacterial biomass to the anaerobic digester of a municipal wastewater treatment plant. Wastewater treatment and subsequent energy production through algae show dominancy over conventional technologies.
KW  - Biogas
KW  - Methane
KW  - Algal Turf Scrubber
KW  - Algal–bacterial bioflm
KW  - Circular bioeconomy
Y1  - 2022
U6  - http://dx.doi.org/10.1007/s13399-022-03236-z
SN  - 2190-6823
N1  - Corresponding author: Dheeraja Cheenakula
VL  - 13
SP  - 15 Seiten
PB  - Springer
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Rupp, Matthias
A1  - Rieke, Christian
A1  - Handschuh, Nils
A1  - Kuperjans, Isabel
T1  - Economic and ecological optimization of electric bus charging considering variable electricity prices and CO₂eq intensities
JF  - Transportation Research Part D: Transport and Environment
N2  - In many cities, diesel buses are being replaced by electric buses with the aim of reducing local emissions and thus improving air quality. The protection of the environment and the health of the population is the highest priority of our society. For the transport companies that operate these buses, not only ecological issues but also economic issues are of great importance. Due to the high purchase costs of electric buses compared to conventional buses, operators are forced to use electric vehicles in a targeted manner in order to ensure amortization over the service life of the vehicles. A compromise between ecology and economy must be found in order to both protect the environment and ensure economical operation of the buses.

In this study, we present a new methodology for optimizing the vehicles’ charging time as a function of the parameters CO₂eq emissions and electricity costs. Based on recorded driving profiles in daily bus operation, the energy demands of conventional and electric buses are calculated for the passenger transportation in the city of Aachen in 2017. Different charging scenarios are defined to analyze the influence of the temporal variability of CO₂eq intensity and electricity price on the environmental impact and economy of the bus. For every individual day of a year, charging periods with the lowest and highest costs and emissions are identified and recommendations for daily bus operation are made. To enable both the ecological and economical operation of the bus, the parameters of electricity price and CO₂ are weighted differently, and several charging periods are proposed, taking into account the priorities previously set. A sensitivity analysis is carried out to evaluate the influence of selected parameters and to derive recommendations for improving the ecological and economic balance of the battery-powered electric vehicle.

In all scenarios, the optimization of the charging period results in energy cost savings of a maximum of 13.6% compared to charging at a fixed electricity price. The savings potential of CO₂eq emissions is similar, at 14.9%. From an economic point of view, charging between 2 a.m. and 4 a.m. results in the lowest energy costs on average. The CO₂eq intensity is also low in this period, but midday charging leads to the largest savings in CO₂eq emissions. From a life cycle perspective, the electric bus is not economically competitive with the conventional bus. However, from an ecological point of view, the electric bus saves on average 37.5% CO₂eq emissions over its service life compared to the diesel bus. The reduction potential is maximized if the electric vehicle exclusively consumes electricity from solar and wind power.
Y1  - 2020
U6  - http://dx.doi.org/10.1016/j.trd.2020.102293
SN  - 1361-9209
VL  - 81
IS  - Article 102293
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - CHAP
A1  - Paulsen, Svea
A1  - Hoffstadt, Kevin
A1  - Krafft, Simone
A1  - Leite, A.
A1  - Zang, J.
A1  - Fonseca-Zang, W.
A1  - Kuperjans, Isabel
T1  - Continuous biogas production from sugarcane as sole substrate
T2  - Energy Reports
Y1  - 2020
U6  - http://dx.doi.org/10.1016/j.egyr.2019.08.035
N1  - 6th International Conference on Energy and Environment Research, ICEER 2019, 22–25 July, University of Aveiro, Portugal
VL  - 6
IS  - Supplement 1
SP  - 153
EP  - 158
PB  - Elsevier
ER  - 
TY  - JOUR
A1  - Hoffstadt, Kevin
A1  - Nikolausz, Marcell
A1  - Krafft, Simone
A1  - Bonatelli, Maria
A1  - Kumar, Vivekanantha
A1  - Harms, Hauke
A1  - Kuperjans, Isabel
T1  - Optimization of the ex situ biomethanation of hydrogen and carbon dioxide in a novel meandering plug flow reactor: start-up phase and flexible operation
JF  - Bioengineering
KW  - methanation
KW  - plug flow reactor
KW  - bubble column
KW  - biomethane
KW  - P2G
Y1  - 2024
U6  - http://dx.doi.org/10.3390/bioengineering11020165
SN  - 2306-5354
VL  - 11
IS  - 2
PB  - MDPI
CY  - Basel
ER  - 
TY  - JOUR
A1  - Hoffstadt, Kevin
A1  - Cheenakula, Dheeraja
A1  - Nikolausz, Marcell
A1  - Krafft, Simone
A1  - Harms, Hauke
A1  - Kuperjans, Isabel
T1  - Design and construction of a new reactor for flexible biomethanation of hydrogen
JF  - Fermentation
N2  - The increasing share of renewable electricity in the grid drives the need for sufficient storage capacity. Especially for seasonal storage, power-to-gas can be a promising approach. Biologically produced methane from hydrogen produced from surplus electricity can be used to substitute natural gas in the existing infrastructure. Current reactor types are not or are poorly optimized for flexible methanation. Therefore, this work proposes a new reactor type with a plug flow reactor (PFR) design. Simulations in COMSOL Multiphysics ® showed promising properties for operation in laminar flow. An experiment was conducted to support the simulation results and to determine the gas fraction of the novel reactor, which was measured to be 29%. Based on these simulations and experimental results, the reactor was constructed as a 14 m long, 50 mm diameter tube with a meandering orientation. Data processing was established, and a step experiment was performed. In addition, a kLa of 1 h−1 was determined. The results revealed that the experimental outcomes of the type of flow and gas fractions are in line with the theoretical simulation. The new design shows promising properties for flexible methanation and will be tested.
KW  - methanation
KW  - plug flow reactor
KW  - bubble column
KW  - bio-methane
KW  - power-to-gas
Y1  - 2023
U6  - http://dx.doi.org/10.3390/fermentation9080774
SN  - 2311-5637
N1  - The article belongs to the Special Issue Fermentation Processes: Modeling, Optimization and Control
VL  - 9
IS  - 8
SP  - 1
EP  - 16
PB  - MDPI
CY  - Basel
ER  -