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See detailDesign and calibration of a two-camera (VNIR and SWIR) hyperspectral acquisition system for the characterization of metallic alloys from the recycling industry
Barnabé, Pierre ULg; Dislaire, Godefroid ULg; Leroy, Sophie ULg et al

in Journal of Electronic Imaging (2015), 24(6),

The conception of a prototype combining two hyperspectral cameras, one ranging from visible to near-infrared and the other covering short-wave infrared, is presented. The prototype aims at the ... [more ▼]

The conception of a prototype combining two hyperspectral cameras, one ranging from visible to near-infrared and the other covering short-wave infrared, is presented. The prototype aims at the characterization of millimeter-sized metallic alloys particles, originating from end-of-life vehicles and waste electrical and electronic equipment recycling. This paper is meant to serve as a support for a similar project by presenting difficulties encountered and available solutions. The calibration steps necessary to obtain quality reflectance data are also described. Classification results obtained on 100 metallic fragments dataset are finally presented. [less ▲]

Detailed reference viewed: 23 (4 ULg)
Peer Reviewed
See detailDesign and characterization of novel forms of human 16K prolactin, an antiangiogenic factor
Mainfroid, Véronique; Struman, Ingrid ULg; Weiner, Richard I. et al

Poster (1998, January)

Detailed reference viewed: 13 (1 ULg)
Peer Reviewed
See detailDesign and develoment of a digital transducer
Lewis, CP; Kraft, Michael ULg; Hesketh, TG

in Proc. AEROTECH 95 (1995)

Detailed reference viewed: 14 (0 ULg)
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See detailDesign and development of new polyamides by ring-opening polymerization for high performance composite materials
Tunc, Deniz; Carlotti, Stéphane; Lecomte, Philippe ULg et al

Poster (2013, May 16)

Detailed reference viewed: 79 (11 ULg)
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See detailDesign and dimensioning of hydrogen transmission pipeline networks
de Wolf, Daniel ULg

in European Journal of Operational Research (2013), 229(1), 239-251

Detailed reference viewed: 15 (1 ULg)
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See detailDesign and Evaluation of a High-Density Energy Storage Route with CO2 Re-Use, Water Electrolysis and Methanol Synthesis
Léonard, Grégoire ULg; Giulini, Davide; Villarreal-Singer, Diego

in Computer Aided Chemical Engineering (2016), 38

The energy transition corresponding to more electricity generation from variable and decentralized renewable energy sources requires the development of electricity storage technologies ranging from ... [more ▼]

The energy transition corresponding to more electricity generation from variable and decentralized renewable energy sources requires the development of electricity storage technologies ranging from seconds to seasons. The power-to-fuel process provides a way to store electricity as a liquid energy vector, leading to high energy density and cheap long-term storage at ambient conditions. In the present work, we study the powerto- methanol process combining CO2 capture, water/CO2 co-electrolysis and methanol synthesis. An Aspen Plus model focussing on the electrolysis and methanol synthesis sub-processes is presented. The energy conversion efficiency is improved from 40.1 to 53.0 % thanks to heat integration using the pinch method. Further works include the experimental demonstration of this technology as well as the development of control strategies for its regulation. [less ▲]

Detailed reference viewed: 87 (3 ULg)
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See detailDesign and evaluation of a high-density energy storage route with CO2 re-use, water electrolysis and methanol synthesis
Léonard, Grégoire ULg; Giulini, Davide; Villarreal-Singer, Diego

Poster (2016, June)

In the context of the Energy Transition, electricity storage ranging from seconds to seasons is needed to increase the integration of variable renewables sources. The power-tofuel process uses a liquid ... [more ▼]

In the context of the Energy Transition, electricity storage ranging from seconds to seasons is needed to increase the integration of variable renewables sources. The power-tofuel process uses a liquid energy vector with high energy density for long-term energy storage. In the present work, we simulate the power-to-methanol process in Aspen Plus. Then, we use heat integration to increase the conversion efficiency from 40.1 to 53.0 %, evidencing large improvement potential thanks to process integration. Further work includes experimental design and development of control strategies. [less ▲]

Detailed reference viewed: 20 (0 ULg)
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See detailDesign and evaluation of a semantic enrichment process for bibliographic databases
Lacasta, Javier; Nogueras-Iso, Javier; Falquet, Gilles et al

in Data & Knowledge Engineering (2013), 88

The limited semantics of thesauri and similar knowledge models hinder the searching and browsing possibilities of the bibliographic databases classified with this type of resources. This work proposes an ... [more ▼]

The limited semantics of thesauri and similar knowledge models hinder the searching and browsing possibilities of the bibliographic databases classified with this type of resources. This work proposes an automatic process to convert a knowledge model into a domain ontology through the alignment with DOLCE, an upper level ontology. This process is facilitated by an intermediary alignment with Wordnet, a lexical model. The process has been tested with the thesauri and bibliographic databases of Urbamet and the European Urban Knowledge Network. The Urbamet model has been used to create an atlas of urban related resources with advanced search capabilities. [less ▲]

Detailed reference viewed: 47 (8 ULg)
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See detailDesign and evaluation of new hydrogels for biomaterial purposes
Grandfils, Christian ULg; Barakat, I; Fairon, N et al

Conference (2003, October 23)

Detailed reference viewed: 9 (1 ULg)
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See detailDesign and evaluation of new reinforced hydrogel membranes for biomaterial purposes
Fairon, N; Grandfils, Christian ULg; Barakat, I et al

Poster (2003, October 23)

Detailed reference viewed: 11 (1 ULg)
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See detailDesign and Experimental investigation of a Small scale organic Rankine using a scroll expander
Declaye, Sébastien ULg; Quoilin, Sylvain ULg; Lemort, Vincent ULg

in Proceeding of the 13th International Refrigeration and Air Conditioning Conference at Purdue (2010, July 11)

The world is facing a historical increase in energy demand and energy consumption. As consequence the conventional fossil fuels are depleting faster with an inherent pollution causing sever damages to our ... [more ▼]

The world is facing a historical increase in energy demand and energy consumption. As consequence the conventional fossil fuels are depleting faster with an inherent pollution causing sever damages to our environment. Renewable energy sources are considered as a solution to both environmental issue and energy demand. At the same time a lot of waste heat is witnessed in processes in industries and other thermal devices such internal combustion engines. Our objective is to propose a solution to recover this heat wasted. The organic Rankine cycle appeared to us as a solution. This paper presents a study carried out on a prototype of small scale organic Rankine cycle (ORC) driven by two waste heat hot air streams. The prototype was designed using a diaphragm pump, a set of plate heat exchangers and an oil-free scroll compressor adapted to run in expander mode. The available literature on Organic Rankine Cycles only proposes theoretical studies of fluid selection for a given application. This study aims at comparing fluids experimentally. Therefore, several fluids (including R245fa and R123) were tested in the prototype and the performance was measured. The tests were performed to study the performance of the ORC system and the expander over a wide range of working conditions. The temperature of the heat sources varied between 150°C and 200°C. The maximum expander shaft power was above 2kW and maximum expander efficiency was 70%. These tests allowed to point out the critical characteristics that should be taken into account while selecting the components for the design of an ORC. [less ▲]

Detailed reference viewed: 446 (33 ULg)
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See detailDesign and experimental validation of an adaptive control law to maximize power generation of a small-scale waste heat recovery system
Hernandez Naranjo, Jairo Andrés ULg; Desideri, Adriano ULg; Gusev, Sergei et al

in Applied Energy (2017), 203

Increasing the energy efficiency of industrial processes is a challenge that involves, not only improving the methodologies for design and manufacturing, but optimizing performance during part-load ... [more ▼]

Increasing the energy efficiency of industrial processes is a challenge that involves, not only improving the methodologies for design and manufacturing, but optimizing performance during part-load operation and transient conditions. A well-adopted solution consists of developing waste heat recovery (WHR) systems based on Organic Rankine Cycle (ORC) power units. The highest efficiency for such cycle is obtained at low superheating values, corresponding to the situation where the system exhibits time-varying nonlinear dynamics, triggered by the fluctuating nature of the waste heat source. In this paper, an adaptive control law using the Model Predictive Control (MPC) framework is proposed. This work goes a step beyond most of the existing scientific works in the field of ORC power systems, since the MPC controller is implemented in a lab-scale prototype, and its performance compared against a gain-scheduled PID strategy. The experimental results show that the adaptive MPC outperforms the gain-scheduled PID based strategy, as it allows to accurately regulate the evaporating temperature, while keeping vapor condition at the inlet of the expander i.e., the superheating, in a safe operating range, thus increasing the net power generation. [less ▲]

Detailed reference viewed: 24 (7 ULg)
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See detailDesign and fabrication of a micromachined electrostatically suspended gyroscope
Damrongsak, Badin; Kraft, Michaël ULg; Rajgopal, S. et al

in Proceedings of the Institution of Mechanical Engineers - Part C - Journal of Mechanical Engineering Science (2008), 222(1), 53--63

The current paper describes the design and fabrication of a micromachined electrostatically suspended gyroscope. Electrostatic levitation is employed to suspend the rotor, eliminating the mechanical ... [more ▼]

The current paper describes the design and fabrication of a micromachined electrostatically suspended gyroscope. Electrostatic levitation is employed to suspend the rotor, eliminating the mechanical bearing and thus friction effects between the rotor and the substrate, hence improving long-term stability. The rate of rotation can be measured by detecting the torque-induced displacement of the spinning rotor using capacitive interface circuits. The device structure and its basic operating principle are described, as well as theoretical background and design considerations. The fabrication process of the gyroscope relies on glass/silicon/ glass stack bonding and deep dry etching and is outlined in detail. Initial prototypes realized with this fabrication process are presented and described. [less ▲]

Detailed reference viewed: 18 (0 ULg)
Peer Reviewed
See detailDesign and Fabrication of a self-aligning gas/liquid micropump.
Schabmueller, CGJ; Koch, M; Kraft, Michael ULg et al

in Proc. SPIE Micromachining and Microfabrication Conference - Microfluid Devices and Systems III (2000)

Detailed reference viewed: 14 (2 ULg)
Peer Reviewed
See detailDesign and Fabrication of a self-aligning gas/liquid micropump.
Schabmueller, CGJ; Koch, M; Kraft, Michael ULg et al

in Proc. SPIE Micromachining and Microfabrication Conference - Microfluid Devices and Systems III (2000)

Detailed reference viewed: 23 (2 ULg)
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See detailDesign and fabrication of a variable wall thickness two-stage scroll expander to be integrated in a micro-solar power plant
Dickes, Rémi ULg

Master's dissertation (2013)

Improving access to energy in developing countries without exacerbating climate change requires novel technical strategies. MicroCSP power plants using organic Rankine cycles (ORCs) are one example of a ... [more ▼]

Improving access to energy in developing countries without exacerbating climate change requires novel technical strategies. MicroCSP power plants using organic Rankine cycles (ORCs) are one example of a promising approach for meeting this challenge. Specifically, expander development has been identified as a critical component for enhancing the performances of small ORC units. The goal of this project is to develop an optimized two-stage scroll expander to be integrated in a MicroCSP power plant designed to supply remote, off-grid areas. The expansion requirements are firstly defined so as to meet production specifications. Then, employing a deterministic model and a selection process, optimal scroll geometries are chosen for both expansion stages. The deterministic model is executed with Matlab and accounts for the relevant physical phenomena i.e. radial and flank leakages, throttling losses at the intake and exhaust processes, friction between the two scrolls and mechanical losses in the different bearings. A performance enhancement of about 6\% of the isentropic efficiency is predicted in comparison with baseline practice. A CAD model of a single-stage prototype is developed in Solidworks following the main architectural features of a compliant HVAC scroll compressor. This CAD is updated and improved with the optimal scroll geometries and some parts are 3D printed to verify their mechanical assembly. Toolpaths to control CNC machines are generated using the CAM program HSMXpress and the parts constituting the expander prototype are manufactured in a machine shop. In conclusion, the properties of the enhanced scroll expander are evaluated in the context of a typical Micro-CSP plant. A simple steady state model in EES is developed to quantify how three parameters (T_ev, T_cond and eta_exp) influence the power plant overall sunlight to electricity conversion efficiency (a gain of 0.73% is predicted). This project underscores the importance of optimizing the expansion process and identifies further research pathways to progress towards this goal. [less ▲]

Detailed reference viewed: 319 (46 ULg)