@inproceedings{PaulsenHoffstadtKrafftetal.2020,
  author    = {Paulsen, Svea and Hoffstadt, Kevin and Krafft, Simone and Leite, A. and Zang, J. and Fonseca-Zang, W. and Kuperjans, Isabel},
  title     = {Continuous biogas production from sugarcane as sole substrate},
  series = {Energy Reports},
  volume    = {6},
  booktitle = {Energy Reports},
  number    = {Supplement 1},
  publisher = {Elsevier},
  doi       = {10.1016/j.egyr.2019.08.035},
  pages     = {153 -- 158},
  year      = {2020},
  abstract  = {A German-Brazilian research project investigates sugarcane as an energy plant in anaerobic digestion for biogas production. The aim of the project is a continuous, efficient, and stable biogas process with sugarcane as the substrate. Tests are carried out in a fermenter with a volume of 10 l. In order to optimize the space-time load to achieve a stable process, a continuous process in laboratory scale has been devised. The daily feed in quantity and the harvest time of the substrate sugarcane has been varied. Analyses of the digester content were conducted twice per week to monitor the process: The ratio of inorganic carbon content to volatile organic acid content (VFA/TAC), the concentration of short-chain fatty acids, the organic dry matter, the pH value, and the total nitrogen, phosphate, and ammonium concentrations were monitored. In addition, the gas quality (the percentages of CO₂, CH₄, and H₂) and the quantity of the produced gas were analyzed. The investigations have exhibited feasible and economical production of biogas in a continuous process with energy cane as substrate. With a daily feeding rate of 1.68gᵥₛ/l*d the average specific gas formation rate was 0.5 m3/kgᵥₛ. The long-term study demonstrates a surprisingly fast metabolism of short-chain fatty acids. This indicates a stable and less susceptible process compared to other substrates.},
  language  = {en}
}
@article{Kuperjans1996,
  author    = {Kuperjans, Isabel},
  title     = {Exergetische und exergo{\"o}konomische Analyse thermischer Prozesse},
  series = {Arbeitsbericht / Institut f{\"u}r Wirtschaftswissenschaften, Rheinisch-Westf{\"a}lische Technische Hochschule Aachen},
  journal   = {Arbeitsbericht / Institut f{\"u}r Wirtschaftswissenschaften, Rheinisch-Westf{\"a}lische Technische Hochschule Aachen},
  number    = {06},
  year      = {1996},
  language  = {de}
}
@inproceedings{KasparGroebelKuperjansetal.2013,
  author    = {Kaspar, K. and Groebel, Simone and Kuperjans, Isabel and Dielmann, Klaus-Peter and Selmer, Thorsten},
  title     = {Charakterisierung der Bioz{\"o}nose von Biogasfermentern in Abh{\"a}ngigkeit verschiedener Substrate},
  series = {Biogas 2013 : 6. Innovationskongress, 23. - 24.05.2013, Osnabr{\"u}ck, Tagungsband},
  booktitle = {Biogas 2013 : 6. Innovationskongress, 23. - 24.05.2013, Osnabr{\"u}ck, Tagungsband},
  publisher = {Profair Consult+Project},
  address   = {Hildesheim},
  issn      = {978-3-9813776-3-7},
  pages     = {69 -- 74},
  year      = {2013},
  language  = {de}
}
@inproceedings{AugensteinHerbergsKuperjansetal.2005,
  author    = {Augenstein, Eckardt and Herbergs, S. and Kuperjans, Isabel and Lucas, K.},
  title     = {Simulation of industrial energy supply systems with integrated cost optimization},
  series = {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},
  booktitle = {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},
  editor    = {Kjelstrup, Signe},
  publisher = {Tapir Academic Press},
  address   = {Trondheim},
  isbn      = {82-519-2041-8},
  pages     = {627 -- 634},
  year      = {2005},
  language  = {en}
}
@inproceedings{KueppersGroebelKuperjansetal.2011,
  author    = {K{\"u}ppers, Christine and Groebel, Simone and Kuperjans, Isabel and Dielmann, Klaus-Peter},
  title     = {Molekulargenetische Analysen zur Optimierung der Biogasgewinnung},
  series = {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},
  booktitle = {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},
  publisher = {Profair Consult+Project},
  address   = {Hildesheim},
  isbn      = {978-3-9813776-1-3},
  pages     = {45 -- 48},
  year      = {2011},
  language  = {de}
}
@inproceedings{AugensteinHerbergsKuperjans2006,
  author    = {Augenstein, Eckardt and Herbergs, S. and Kuperjans, Isabel},
  title     = {Planung und Bewertung der Geb{\"a}udeenergieversorgung mit TOP-Energy},
  series = {Heizungs- und Raumlufttechnik : 1. Fachtagung Leonberg, 31. Januar bis 1. Februar 2006. - (VDI-Berichte ; Nr. 1921)},
  booktitle = {Heizungs- und Raumlufttechnik : 1. Fachtagung Leonberg, 31. Januar bis 1. Februar 2006. - (VDI-Berichte ; Nr. 1921)},
  publisher = {VDI-Verl.},
  address   = {D{\"u}sseldorf},
  isbn      = {3-18-091921-3},
  pages     = {57 -- 60},
  year      = {2006},
  language  = {de}
}
@inproceedings{KuperjansSchreiberDetermannetal.1998,
  author    = {Kuperjans, Isabel and Schreiber, M. and Determann, L. and Schreiber, R.},
  title     = {Entscheidungsunterst{\"u}tzung bei der Gestaltung der betrieblichen Energieversorgung und -nutzung},
  series = {Innovationen bei der rationellen Energieanwendung : neue Chancen f{\"u}r die Wirtschaft ; Tagung Dortmund, 3. und 4. M{\"a}rz 1998. - (VDI-Berichte ; 1385)},
  booktitle = {Innovationen bei der rationellen Energieanwendung : neue Chancen f{\"u}r die Wirtschaft ; Tagung Dortmund, 3. und 4. M{\"a}rz 1998. - (VDI-Berichte ; 1385)},
  publisher = {VDI-Verl.},
  address   = {D{\"u}sseldorf},
  isbn      = {3-18-091385-1},
  pages     = {79 -- 94},
  year      = {1998},
  language  = {de}
}
@incollection{AugensteinGuerzenichKuperjansetal.2004,
  author    = {Augenstein, Eckardt and G{\"u}rzenich, D. and Kuperjans, Isabel and Wrobel, G.},
  title     = {TOP-Energy : softwaregest{\"u}tzte Analyse und Optimierung industrieller Energieversorgungssysteme},
  series = {Entwicklungslinien der Energietechnik 2004},
  booktitle = {Entwicklungslinien der Energietechnik 2004},
  edition   = {CD-ROM-Ausg.},
  publisher = {VDI},
  address   = {D{\"u}sseldorf},
  year      = {2004},
  language  = {de}
}
@inproceedings{AugensteinKuperjansLucas2002,
  author    = {Augenstein, Eckardt and Kuperjans, Isabel and Lucas, K.},
  title     = {EUSEBIA - Decision-Support-System for Technical, Economical and Ecological Design and Evaluation of Industrial Energy Systems},
  series = {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},
  booktitle = {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},
  editor    = {Tsatsaronis,, Georgios},
  publisher = {Techn. Univ., Inst. for Energy Engineering},
  address   = {Berlin},
  isbn      = {3-00-009533-0},
  pages     = {446 -- 453},
  year      = {2002},
  language  = {en}
}
@article{KuperjansGuerzenichRoosen2005,
  author    = {Kuperjans, Isabel and G{\"u}rzenich, D. and Roosen, P.},
  title     = {Kostenfunktionen im WWW : Unterst{\"u}tzung der Auslegung energietechnischer Anlagen und deren Verschaltungen},
  series = {Gasw{\"a}rme international (GWI)},
  volume    = {54},
  journal   = {Gasw{\"a}rme international (GWI)},
  number    = {1},
  issn      = {0020-9384},
  pages     = {19 -- 21},
  year      = {2005},
  language  = {de}
}
@inproceedings{KumaranGopinathanRazalietal.2013,
  author    = {Kumaran, P. and Gopinathan, M. and Razali, N. M. and Kuperjans, Isabel and Hariffin, B. and Hamdan, H.},
  title     = {Preliminary evaluation of atomization characteristics of improved biodiesel for gas turbine application},
  series = {IOP Conference Series: Earth and Environmental Science (EES)},
  volume    = {16},
  booktitle = {IOP Conference Series: Earth and Environmental Science (EES)},
  number    = {1},
  publisher = {Institute of Physics Publishing (IOP)},
  address   = {London [u.a.]},
  issn      = {1755-1315},
  doi       = {10.1088/1755-1315/16/1/012014},
  pages     = {012014/1 -- 012014/4},
  year      = {2013},
  language  = {en}
}
@inproceedings{AugensteinKuperjans2001,
  author    = {Augenstein, Eckardt and Kuperjans, Isabel},
  title     = {Softwaregest{\"u}tzte Analyse und Konzeption betrieblicher Energieversorgungsanlagen},
  series = {Fortschrittliche Energiewandlung und -anwendung : Schwerpunkt: dezentrale Energiesysteme ; Tagung Bochum, 13. und 14. M{\"a}rz 2001. - (VDI-Berichte ; 1594)},
  booktitle = {Fortschrittliche Energiewandlung und -anwendung : Schwerpunkt: dezentrale Energiesysteme ; Tagung Bochum, 13. und 14. M{\"a}rz 2001. - (VDI-Berichte ; 1594)},
  publisher = {VDI-Verl.},
  address   = {D{\"u}sseldorf},
  isbn      = {3-18-091594-3},
  pages     = {313 -- 322},
  year      = {2001},
  language  = {de}
}
@article{KuperjansEsserMeyeretal.2000,
  author    = {Kuperjans, Isabel and Esser, J. and Meyer, J{\"o}rg and Donner, O.},
  title     = {Gestaltung und Bewertung von Energieanlagen unter {\"o}kologischen, wirtschaftlichen und technischen Gesichtspunkten},
  series = {Umweltwirtschaftsforum : UWF},
  volume    = {8},
  journal   = {Umweltwirtschaftsforum : UWF},
  number    = {3},
  issn      = {0943-3481},
  pages     = {53 -- 58},
  year      = {2000},
  language  = {de}
}
@article{AugensteinHerbergsKuperjans2006,
  author    = {Augenstein, Eckardt and Herbergs, S. and Kuperjans, Isabel},
  title     = {TOP-Energy : ein Werkzeug zur Optimierung der Geb{\"a}udeenergieversorgung},
  series = {KI : K{\"a}lte, Luft, Klimatechnik},
  journal   = {KI : K{\"a}lte, Luft, Klimatechnik},
  number    = {5},
  issn      = {1865-5432},
  pages     = {198 -- 201},
  year      = {2006},
  language  = {de}
}
@article{PauksztatKuperjansMeyer2005,
  author    = {Pauksztat, Anja and Kuperjans, Isabel and Meyer, J{\"o}rg},
  title     = {Formeln statt Zahlen : Referenzwerte Formeln zur energetischen Bewertung von Produktionsanlagen},
  series = {BWK : das Energie-Fachmagazin},
  volume    = {57},
  journal   = {BWK : das Energie-Fachmagazin},
  number    = {12},
  issn      = {0006-9612},
  pages     = {52 -- 55},
  year      = {2005},
  language  = {de}
}
@article{PauksztatKuperjansMeyer2005,
  author    = {Pauksztat, Anja and Kuperjans, Isabel and Meyer, J{\"o}rg},
  title     = {Produktbezogene Referenzwerte f{\"u}r Energieeffizienz und CO2-Emissionen},
  series = {Energiewirtschaftliche Tagesfragen : et ; Zeitschrift f{\"u}r Energiewirtschaft, Recht, Technik und Umwelt},
  volume    = {55},
  journal   = {Energiewirtschaftliche Tagesfragen : et ; Zeitschrift f{\"u}r Energiewirtschaft, Recht, Technik und Umwelt},
  number    = {6},
  issn      = {0013-743X},
  pages     = {374 -- 376},
  year      = {2005},
  language  = {de}
}
@inproceedings{KuperjansAugenstein2001,
  author    = {Kuperjans, Isabel and Augenstein, Eckardt},
  title     = {„EUSEBIA - Software zur Analyse und Verbesserung der betrieblichen Energiewirtschaft},
  series = {Optimierung in der Energieversorgung : Tagung Veitsh{\"o}chheim, 9. und 10. Oktober 2001. - (VDI-Berichte ; 1627)},
  booktitle = {Optimierung in der Energieversorgung : Tagung Veitsh{\"o}chheim, 9. und 10. Oktober 2001. - (VDI-Berichte ; 1627)},
  publisher = {VDI-Verl.},
  address   = {D{\"u}sseldorf},
  isbn      = {3-18-091627-3},
  pages     = {267 -- 268},
  year      = {2001},
  language  = {de}
}
@inproceedings{KuperjansSeitzWilhelm1998,
  author    = {Kuperjans, Isabel and Seitz, C.-W. and Wilhelm, H.-G.},
  title     = {Realisierung einer Fernw{\"a}rmeversorgung mit Kraft-W{\"a}rme-Kopplung f{\"u}r den Wohnwertpark Br{\"u}hl},
  series = {Energiemanagement in Kommunen und {\"o}ffentlichen Einrichtungen : Tagung Stuttgart, 16. und 17. September 1998. - (VDI-Berichte ; 1424)},
  booktitle = {Energiemanagement in Kommunen und {\"o}ffentlichen Einrichtungen : Tagung Stuttgart, 16. und 17. September 1998. - (VDI-Berichte ; 1424)},
  publisher = {VDI-Verl.},
  address   = {D{\"u}sseldorf},
  organization    = {Gesellschaft Energietechnik},
  issn      = {3-18-091424-6},
  pages     = {129 -- 138},
  year      = {1998},
  language  = {de}
}
@article{RuppHandschuhRiekeetal.2019,
  author    = {Rupp, Matthias and Handschuh, Nils and Rieke, Christian and Kuperjans, Isabel},
  title     = {Contribution of country-specific electricity mix and charging time to environmental impact of battery electric vehicles: A case study of electric buses in Germany},
  series = {Applied Energy},
  volume    = {237},
  journal   = {Applied Energy},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {0306-2619},
  doi       = {10.1016/j.apenergy.2019.01.059},
  pages     = {618 -- 634},
  year      = {2019},
  language  = {en}
}
@article{HoffstadtPohenDickeetal.2020,
  author    = {Hoffstadt, Kevin and Pohen, Gino D. and Dicke, Max D. and Paulsen, Svea and Krafft, Simone and Zang, Joachim W. and Fonseca-Zang, Warde A. da and Leite, Athaydes and Kuperjans, Isabel},
  title     = {Challenges and prospects of biogas from energy cane as supplement to bioethanol production},
  series = {Agronomy},
  volume    = {10},
  journal   = {Agronomy},
  number    = {6},
  publisher = {MDPI},
  address   = {Basel},
  issn      = {2073-4395},
  doi       = {10.3390/agronomy10060821},
  year      = {2020},
  abstract  = {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.},
  language  = {en}
}