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See detailExperimental performance characterization of a new single room ventilation device with heat recovery
Gendebien, Samuel ULg; Georges, Emeline ULg; Prieels, Luc et al

in Proceedings of the 34th AIVC conference (2013, September)

Nowadays, important efforts are made to reduce the residential building energy consumption. In this context, a growing interest for heat recovery ventilation has been observed during the last decades. The ... [more ▼]

Nowadays, important efforts are made to reduce the residential building energy consumption. In this context, a growing interest for heat recovery ventilation has been observed during the last decades. The present paper focuses on a new single room ventilation with heat recovery. Double flow ventilation is achieved through the integration of the unit into windows ledges. The developed device is particularly suitable compared to traditional centralized heat recovery ventilation units for retrofitted houses due to the absence of air extracting and air pulsing ducts through the house. The first part of the paper consists in describing the characteristics and properties of the developed device (volume, components, flow configuration, advantages and drawbacks). In the second part of the paper, an experimental approach is presented to characterize the unit. The criteria of performance are based on: - Thermal effectiveness of the unit (testing of a recovery heat exchanger), - Hydraulic aspects (flows delivered by the unit vs energy supplied to the unit), - Acoustic aspects. The overall performance of the unit can be established based on the experimental results described here above. Cartography of performance (ratio between the recovered heat and the supply electrical power) can be drawn, depending on the flow rates delivered by the unit and the indoor/outdoor temperature difference. The last part of the paper compares the new system with natural, simple exhaust ventilation and traditional centralized systems in terms of primary energy, consumer price and carbon dioxide emissions. Results show that the presented device seems more competitive than natural and simple exhaust ventilation for the Belgian climate. The single room ventilation investigated in this paper also shows better performance than most of the centralized ventilation systems tested on site. [less ▲]

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See detailExperimental procedure and statistical data treatment for the kinetic study of selective hydrodechlorination of 1,2-dichloroethane into ethylene over a Pd-Ag sol–gel catalyst
Pirard, Sophie ULg; Pirard, Jean-Paul ULg; Heyen, Georges ULg et al

in Chemical Engineering Journal (2011), 173(3), 801-812

The kinetics of selective hydrodechlorination of 1,2-dichloroethane into ethylene over a Pd- Ag/SiO2 catalyst was studied using an a priori experimental design with five independent variables—temperature ... [more ▼]

The kinetics of selective hydrodechlorination of 1,2-dichloroethane into ethylene over a Pd- Ag/SiO2 catalyst was studied using an a priori experimental design with five independent variables—temperature and partial pressures of 1,2-dichloroethane, hydrogen, ethylene and hydrogen chloride. A Langmuir–Hinshelwood model including two types of active site and the 1,2-dichloroethane adsorption as the rate-determining step was found to fit correctly with experimental data, according to the analysis of variance and the analysis of pondered residuals. The study allowed for catalytic deactivation. The rigorous experimental and statistical approach followed to carry out such a kinetic study is explained in detail. [less ▲]

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See detailExperimental production of hypocalcemia by EDTA infusion in calves : a critical appraisal assessed from the profile of blood chemicals and enzymes
Desmecht, Daniel ULg; Linden, Annick ULg; Godeau, J. M. et al

in Comparative Biochemistry and Physiology. A : Comparative Physiology (1995), 110A(2), 115-130

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See detailExperimental quantification of the local strains in bone TE scaffolds by the combined use of micro-CT imaging, in-situ loading and local strain mapping
Kerckhofs, Greet ULg; Moesen, Maarten; Loeckx, Dirk et al

in Proc. ECCOMAS - International Conference on Tissue Engineering 2009. . 2009, Bártolo, P. (Eds.) (2009)

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See detailExperimental reactivation of equine herpesvirus-3 following corticosteroid treatment.
Barrandeguy, M.; Vissani, A.; Olguin, C. et al

in Equine Veterinary Journal (2008), 40(6), 593-5

State of latency, well known for several herpesviruses, has been proposed for equine herpesvirus-3 (EHV-3) and supported by epidemiological observations. No detailed assessment about reactivation ... [more ▼]

State of latency, well known for several herpesviruses, has been proposed for equine herpesvirus-3 (EHV-3) and supported by epidemiological observations. No detailed assessment about reactivation, patterns of excretion and reexcretion has been formally reported. An experimental reactivation study by corticosteroid treatment in previously naturally infected horses was therefore carried out. Two polo mares with clinical and virologically confirmed history of equine coital exanthema were injected with dexamethasone and prednisolone on 3 successive days. Clinical signs, body temperature and clinical samples for virological and serological studies were obtained daily. Mares did not show any systemic clinical signs or hyperthermia. EHV-3 shedding, seroconversion and the presence of a small lesion were observed in one of the mares under study 2 weeks after corticosteroid treatment. The results demonstrate that this virus exhibits a latency-reactivation behaviour similar to that of other alpha herpesviruses. Reactivation of latency may have an important bearing on the appearance of clinical signs in mares and/or stallions during the breeding season without the actual evidence of transfer from mare to stallion or vice versa. [less ▲]

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See detailExperimental reproduction of bluetongue virus serotype 8 clinical disease in calves.
Dal Pozzo, Fabiana ULg; De Clercq, Kris; Guyot, Hugues ULg et al

in Veterinary Microbiology (2009), 136(3-4), 352-8

Cattle are commonly subclinically infected following natural or experimental infection with bluetongue virus (BTV). The introduction of BTV serotype 8 (BTV-8) in Europe has been characterized by the ... [more ▼]

Cattle are commonly subclinically infected following natural or experimental infection with bluetongue virus (BTV). The introduction of BTV serotype 8 (BTV-8) in Europe has been characterized by the manifestation of clinical signs in infected cattle. In order to study the pathogenesis of BTV-8 in this host, an animal model able to reproduce the clinical manifestations of the disease is required. In this work, two calves were subcutaneously and intravenously injected with a low passage cell-adapted strain of BTV-8. Both calves showed typical bluetongue clinical signs, including pyrexia, ocular discharge, conjunctivitis, oral mucosal congestion, development of ulcers and necrotic lesions on the lips and tongue, submandibular oedema, coronitis and oedema of the coronet and pastern region. A score was assigned depending on the severity of the lesions and a total clinical score was calculated for each animal daily and at the end of the experiment. Both calves became viraemic 24h post-infection and seroconversion occurred between 7 and 11 days P.I. In this study we present the development of a protocol of infection in calves able to reproduce the severity of the lesions observed with BTV-8 in field conditions. [less ▲]

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See detailExperimental research on the determination of the main parameters affecting the behaviour of reinforced concrete columns under fire conditions
Dotreppe, Jean-Claude ULg; Franssen, Jean-Marc ULg; Bruls, Alois et al

in Magazine of Concrete Research (1996), 48(6), 117-127

The design of reinforced concrete columns under fire conditions is generally made on the basis of national and international recommendations. The CEB/FIP recommendations have been used for many years ... [more ▼]

The design of reinforced concrete columns under fire conditions is generally made on the basis of national and international recommendations. The CEB/FIP recommendations have been used for many years. Recently, in the framework of the Eurocodes, the document ENV 1992-1-2 (Eurocode 2-1-2), Structural fire design, has been approved by Commission CEN/TC250/SC2 of the European Committee for Standardization. In the CEB/FIP documents and in Eurocode 2-1-2 the main part is devoted to design from tabulated data containing the dimensions of the cross-sections and values for the concrete cover. The use of simplified calculation methods is not current practice for concrete elements, while they are widely used in the case of steel. The determination of the temperature distribution in the cross-section does not facilitate the development of a simplified method. Furthermore, in columns there is a wide scatter of experimental results. In order to gain additional information, an extensive experimental research programme on the behaviour of reinforced concrete columns under fire conditions, financially supported by the Belgian Funds for Fundamental Collective Research (FRFC-FKFO), has been performed at the Universities of Liege and Ghent. In this article the results of this research are presented and the influence of the main parameters is analysed. [less ▲]

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See detailExperimental Results of Flat Fresnel Doublets made of PMMA and PC
Languy, Fabian ULg; Fleury-Frenette, Karl ULg; Lenaerts, Cedric ULg et al

Conference (2012, April)

To reduce the chromatic aberration lots of imaging systems like cameras and telescopes turn to achromatic doublets. On the other hand, to be cheaper, lighter and thinner, more and more systems like ... [more ▼]

To reduce the chromatic aberration lots of imaging systems like cameras and telescopes turn to achromatic doublets. On the other hand, to be cheaper, lighter and thinner, more and more systems like projectors and headlights use Fresnel lenses. To combine high performances and low cost, the use achromatic Fresnel doublets has been investigated. [less ▲]

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See detailExperimental Results of Hybrid and Refractive Achromatic Doublets Made of PC and PMMA
Languy, Fabian ULg; Lenaerts, Cedric ULg; Loicq, Jerôme ULg et al

Conference (2012, November 12)

To combine achromatic system with cost-effective technology, we propose the use or hybride (refractive/diffractive) and refractive doublets Fresnel lenses. These two technologies have been compared ... [more ▼]

To combine achromatic system with cost-effective technology, we propose the use or hybride (refractive/diffractive) and refractive doublets Fresnel lenses. These two technologies have been compared experimentally from an optical point of view [less ▲]

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See detailExperimental study and modeling of a low temperature Rankine Cycle for small scale cogeneration
Quoilin, Sylvain ULg

Master's dissertation (2007)

An experimental study is carried out on an ORC recovering heat from hot air at a temperature ranging from 150 to 200°C. The expander used for this study is a volumetric scroll expander. The working fluid ... [more ▼]

An experimental study is carried out on an ORC recovering heat from hot air at a temperature ranging from 150 to 200°C. The expander used for this study is a volumetric scroll expander. The working fluid selected is R123 because of its high efficiency in ORC applications. A model of each component of the cycle is proposed and validated. The whole cycle is simulated in order to have a good understanding of its behavior under different working conditions. The model is then used to optimize the cycle, starting from a basic case and improving it in a realistic way to evaluate the system potential. [less ▲]

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See detailExperimental study and modeling of an Organic Rankine Cycle using scroll expander
Quoilin, Sylvain ULg; Lemort, Vincent ULg; Lebrun, Jean ULg

in Applied Energy (2010), 87(4), 1260-1268

This paper presents both a numerical model of an Organic Rankine Cycle (ORC) and an experimental study carried out on a prototype working with refrigerant HCFC-123, and whose heat sources consist in two ... [more ▼]

This paper presents both a numerical model of an Organic Rankine Cycle (ORC) and an experimental study carried out on a prototype working with refrigerant HCFC-123, and whose heat sources consist in two hot air flows. The ORC model is built by interconnecting different sub-models: the heat exchanger models, a volumetric pump model and a scroll expander model. Measured performance of the ORC prototype is presented and used to validate the ORC model. This model is finally used to investigate potential improvements of the prototype. [less ▲]

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See detailExperimental study and modeling of sorption isotherms of Kabar Sid El Cheikh Capparis spinosa L. from Bechar (South west Algeria)
Said, Bennaceur; Belkacem, Draoui; Bennamoun, Lyes ULg et al

in Energy Procedia (2012), 18

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See detailExperimental study and modeling the behavior of a solar water heater tested at the regions of Adrar, Algeria
Bennaceur, Said; Draoui, Belkacem; Benhamoun, Mohamed et al

in International Journal of Advanced Renewable Energy Research (2012), 1(8), 460-466

Detailed reference viewed: 27 (6 ULg)
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See detailExperimental study and modelling of cooling ceiling systems using steady-state analysis.
Fonseca, N.; Lebrun, J.; Andre, Philippe ULg

in International Journal of Refrigeration (2010), 33

Detailed reference viewed: 49 (15 ULg)
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See detailExperimental Study and Statistical Modeling of an Injection Scroll Compressor Operating with R407c.
Quoilin, Sylvain ULg

E-print/Working paper (2014)

This working paper describes an experimental study carried out on a refrigeration scroll compressor with and without vapour injection. The test rig designed for that purposed allows evaluating the ... [more ▼]

This working paper describes an experimental study carried out on a refrigeration scroll compressor with and without vapour injection. The test rig designed for that purposed allows evaluating the performance over a wide range of operating conditions, by varying the supply pressure, the injection pressure, the exhaust pressure, the supply superheating and the injection superheating. 97 Steady-state points are measured, with a maximum isentropic efficiency of 64.1% and a maximum consumed electrical power of 13.1 kW. A critical analysis of the experimental results is then carried out to evaluate the quality of the data using a machine learning method. This method based on Gaussian Processes regression, is used to build a statistical operating map of the compressor as a function of the different inputs. This statistical operating map can then be compared to the experimental data points to evaluate their accuracy. [less ▲]

Detailed reference viewed: 54 (9 ULg)
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See detailExperimental study of a heat exchanger for an in-flight oxygen collection launcher
Hendrick, Patrick; Bizzarri, Didier; Dardenne, Laurent et al

in 14th AIAA/AHI International Space Planes and Hypersonic Systems and Technologies Conference (2006, November)

In the scope of an ESA-funded theoretical and experimental study (in the GSTP3 program) on heat exchangers intended to provide in-flight oxygen collection capability to a reusable or a semi-reusable TSTO ... [more ▼]

In the scope of an ESA-funded theoretical and experimental study (in the GSTP3 program) on heat exchangers intended to provide in-flight oxygen collection capability to a reusable or a semi-reusable TSTO launcher with an oxygen collection phase in supersonic cruise, two subscale models of an air-hydrogen precooler and a test set-up are currently being developed in Belgium and in Spain. The vehicle we foresee for this application is described in previous conference papers as well as the work on our ESA-funded airborne air separator, which is the other critical element of the oxygen collection plant. This current paper is concentrating only on the theoretical but mainly the technological and experimental aspects of such an air precooler. The experimental and technical aspects include choices and main trade-offs that have had to be made during the design process by the different partners (Techspace Aero, von Karman Institute, Iberespacio, University of Liège, Royal Military Academy of Belgium and University of Brussels). After we fixed the requirements at system level and at the precooler level, a simulation work of generic heat exchangers is presented including the problem of frost formation and its influence on the heat exchanger performance. A few advanced heat exchanger designs are analysed resulting in a more detailed parametric and performance analysis of two advanced configurations. A detailed study of the most advantageous heat exchangers materials is shown resulting in the selection of the alloys for the two breadboards. The manufacturing processes for these two breadboards are defined, based on trials on small scale models inspired from the two technology candidates. Perspectives are also given for the mechanical and thermodynamic testing of the two breadboards. [less ▲]

Detailed reference viewed: 39 (1 ULg)