Author
Lieve Helsen
Other affiliations: Energy Institute, University of Copenhagen Faculty of Science
Bio: Lieve Helsen is an academic researcher from Katholieke Universiteit Leuven. The author has contributed to research in topics: Model predictive control & Heat pump. The author has an hindex of 42, co-authored 207 publications receiving 5841 citations. Previous affiliations of Lieve Helsen include Energy Institute & University of Copenhagen Faculty of Science.
Papers published on a yearly basis
Papers
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TL;DR: In this paper, the main beneficial properties of anaerobic digestion are discussed and the potential, opportunities and challenges of these biomasses are discussed, and the typical biogas yield and points of attention are included.
Abstract: It is clear that renewable resources will play a crucial role in limiting the CO2 emissions. Energy from biomass and waste is regarded as one of the most dominant future renewable energy sources, since it can provide a continuous power generation. In this regard, the application of anaerobic digestion is emerging spectacularly. This manuscript lists and discusses the main beneficial properties of anaerobic digestion. Different types of biomass and waste are suitable for anaerobic digestion: the organic fraction of municipal solid waste, waste oils and animal fat, energy crops and agricultural waste, manure and sewage sludge. The potential, opportunities and challenges of these biomasses are discussed. Typical biogas yield and points of attention are included. The manuscript concludes with an overview and discussion of the major research trends in anaerobic digestion, including the analysis of microbial community development, the extension of anaerobic digestion models, the development of pre-treatment techniques and upgrading of the biogas produced.
764 citations
TL;DR: The potential and suitability of these thermochemical technologies for enhanced waste management (EWM) and enhanced landfill mining (ELFM) applications are discussed in this article, with a focus on municipal solid waste (MSW), possibly processed into refuse derived fuel (RDF).
384 citations
TL;DR: This paper provides a unified framework for model predictive building control technology with focus on the real-world applications and presents the essential components of a practical implementation of MPC such as different control architectures and nuances of communication infrastructures within supervisory control and data acquisition (SCADA) systems.
276 citations
TL;DR: In this article, a tool for Integrated District Energy Assessment by Simulation (IDEAS) is developed, which allows simultaneous transient simulation of thermal and electrical systems at both building and feeder level.
214 citations
TL;DR: A possible definition of flexibility and its sources in a thermal network is presented and the need for a more advanced control strategy is shown, by making a distinction between central, distributed and hybrid control.
207 citations
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TL;DR: Strong acids and bases seem to be the best desorbing agents to produce arsenic concentrates, and some commercial adsorbents which include resins, gels, silica, treated silica tested for arsenic removal come out to be superior.
3,168 citations
01 Jan 2008
TL;DR: In this article, the authors argue that rational actors make their organizations increasingly similar as they try to change them, and describe three isomorphic processes-coercive, mimetic, and normative.
Abstract: What makes organizations so similar? We contend that the engine of rationalization and bureaucratization has moved from the competitive marketplace to the state and the professions. Once a set of organizations emerges as a field, a paradox arises: rational actors make their organizations increasingly similar as they try to change them. We describe three isomorphic processes-coercive, mimetic, and normative—leading to this outcome. We then specify hypotheses about the impact of resource centralization and dependency, goal ambiguity and technical uncertainty, and professionalization and structuration on isomorphic change. Finally, we suggest implications for theories of organizations and social change.
2,134 citations
TL;DR: This article gives an up-to-date and accessible introduction to the CasADi framework, which has undergone numerous design improvements over the last 7 years.
Abstract: We present CasADi, an open-source software framework for numerical optimization. CasADi is a general-purpose tool that can be used to model and solve optimization problems with a large degree of flexibility, larger than what is associated with popular algebraic modeling languages such as AMPL, GAMS, JuMP or Pyomo. Of special interest are problems constrained by differential equations, i.e. optimal control problems. CasADi is written in self-contained C++, but is most conveniently used via full-featured interfaces to Python, MATLAB or Octave. Since its inception in late 2009, it has been used successfully for academic teaching as well as in applications from multiple fields, including process control, robotics and aerospace. This article gives an up-to-date and accessible introduction to the CasADi framework, which has undergone numerous design improvements over the last 7 years.
2,056 citations
11 Dec 2012
1,704 citations
TL;DR: In this article, the state of the art in modeling chemical and physical processes of wood and biomass pyrolysis is reported, and the main achievements of numerical simulations are discussed.
1,495 citations