Zukünftige Energie- und Industriesysteme
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Urban GHG emissions and resource flows : methods for understanding the complex functioning of cities
(2015)
This paper sums up the recent developments in concepts and methods being used to measure the impacts of cities on environmental sustainability. It differentiates between a dominant trend in research literature that concentrates on the accounting and allocation of greenhouse gas (GHG) emissions and energy use to cities, and a re-emergence of studies focusing on the direct and indirect urban material and resource flows. The availability of reliable data and standard protocols is greater in the GHG accounting field and continues to grow rapidly.
Bei der Großen Transformation handelt es sich laut Wissenschaftlichen Beirat Globale Umweltveränderungen (WGBU) um einen ganzheitlichen Wandel des fossilen ökonomischen Systems in Richtung klimaverträglicher Nachhaltigkeit und höherer Lebensqualität. Schon heute lebt mehr als die Hälfte der Menschheit in Städten - in Deutschland sind es über 80 %. In der Transformationsforschung spielen daher Städte eine zentrale Rolle. In Bottrop finden derzeit zwei großangelegte ökologische Transformationsprozesse statt. Zum einen wird die Emscher im Norden der Stadt renaturiert. Der bisher als Abwasserkanal genutzte Fluss erstreckt sich über das gesamte Ruhrgebiet und wird in einer insgesamt 20 Jahre langen Umbauphase zu einem naturnahen Gewässer zurückgeführt. Zum anderem ist Bottrop Gewinner des Wettbewerbs InnovationCity Ruhr. Im Frühjahr 2010 rief der Initiativkreis Ruhr einen Wettbewerb aus, bei dem die Klimastadt der Zukunft gefunden werden sollte. Ziel von InnovationCity Ruhr ist es die CO2-Emmissionen in Bottrop bis 2020 zu halbieren und somit eine Vorbildfunktion zur klimafreundlichen Wandlung für das gesamte Ruhrgebiet einzunehmen. Die erfolgreiche Implementation solcher Transformationsprozesse ist laut WBGU von der Akzeptanz, Legitimation und Partizipation der Bevölkerung abhängig. Diese Forschungsarbeit zeigt mittels einer Methodentriangulation von Interviews mit acht Bottroper Bürgerinnen und Bürger sowie der Anwendung einer Collagenmethode, welche Einstellungen und Präferenzen die Bottroper Bevölkerung in Bezug zum urbanen Leben hat. Dabei steht die Frage im Mittelpunkt: Was bedeutet Lebensqualität für die Bottroper und wie lässt sich diese mit der Großen Transformation vereinbaren? Anschließend werden sowohl Anknüpfungspunkte als auch Interessenkonflikte zu den Transformationsprozessen Emscher-Umbau und InnovationCity Ruhr aufgedeckt. Diese Masterarbeit ist in Zusammenarbeit des Wuppertal Instituts mit der Universität Duisburg Essen im Studiengang "Urbane Kultur Gesellschaft und Raum" entstanden.
Urbane Suffizienz
(2013)
The German Energiewende is a deliberate transformation of an established industrial economy towards a nearly CO2-free energy system accompanied by a phase out of nuclear energy. Its governance requires knowledge on how to steer the transition from the existing status quo to the target situation (transformation knowledge). The energy system is, however, a complex socio-technical system whose dynamics are influenced by behavioural and institutional aspects, which are badly represented by the dominant techno-economic scenario studies. In this paper, we therefore investigate and identify characteristics of model studies that make agent-based modelling supportive for the generation of transformation knowledge for the Energiewende. This is done by reflecting on the experiences gained from four different applications of agent-based models. In particular, we analyse whether the studies have improved our understanding of policies' impacts on the energy system, whether the knowledge derived is useful for practitioners, how valid understanding derived by the studies is, and whether the insights can be used beyond the initial case-studies. We conclude that agent-based modelling has a high potential to generate transformation knowledge, but that the design of projects in which the models are developed and used is of major importance to reap this potential. Well-informed and goal-oriented stakeholder involvement and a strong collaboration between data collection and model development are crucial.
For some time, 3D printing has been a major buzzword of innovation in industrial production. It was considered a game changer concerning the way industrial goods are produced. There were early expectations that it might reduce the material, energy and transport intensity of value chains. However for quite a while, the main real world applications of additive manufacturing (AM) have been some rapid prototyping and the home-based production of toys made from plastics. On this limited basis, any hypotheses regarding likely impacts on industrial energy efficiency appeared to be premature. Notwithstanding the stark contrast between early hype and practical use, the diffusion of AM has evolved to an extent that at least for some applications allows for a preliminary assessment of its likely implications for energy efficiency.
Unlike many cross-cutting energy efficiency technologies, energy use of AM may vary substantially depending on industry considered and material used for processing. Moreover, AM may have much greater repercussions on other stages of value chains than conventional cross-cutting energy efficiency technologies. In case of AM with metals the following potential determinants of energy efficiency come to mind:
- A reduction of material required per unit of product and used during processing;
- Changes in the total number and spatial allocation of certain stages of the value chain; and
- End-use energy efficiency of final products.
At the same time, these various streams of impact on energy efficiency may be important drivers for the diffusion of AM with metals. This contribution takes stock of AM with metals concerning applications and processes used as well as early evidence on impacts on energy efficiency and combine this into a systematic overview. It builds on relevant literature and a case study on Wire Arc Additive Manufacturing performed within the REINVENT project.