Publications of Philippe Andre
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See detailVerification of the energy performance of the "Jacques Geelen" climate chamber of campus d'Arlon, by co-heating and grey box model.
Rehab, Imane; Andre, Philippe ULiege

in Mathur, Jyotirmay; Garg, Vishal (Eds.) Proceedings of BS2015: 14th Conference of International Building Performance Simulation Association (2015)

Building energy performance characterization at design stage is theoretical and could be subject to errors . In operation, it is difficult to verify the reliability of these calculated parameters. The aim ... [more ▼]

Building energy performance characterization at design stage is theoretical and could be subject to errors . In operation, it is difficult to verify the reliability of these calculated parameters. The aim of this paper is to set in, a method of verification based upon full-scale dynamic measurements. It presents a complete experimentation of identification/validation of energy performance parameters, upon the “Jacques Geelen” climate chamber of Arlon campus in Belgium. The experiment uses a co-heating method for identification under stationary regime and grey box model under the dynamic regime. Additionally, a Kalman filter is used to estimate the different disturbances of internal gains in the grey box model. A reliable mathematical model is finally provided for identification of building energy performance parameters. [less ▲]

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See detailLessons Learned from Heat Balance Analysis for Holzkirchen Twin Houses Experiment
Masy, Gabrielle; Rehab, Imane ULiege; Andre, Philippe ULiege et al

in Energy Procedia (2015)

Holzkirchen full scale dynamic experiments were conducted in the framework of IEA Annex 58 research program with the aim to obtain and apply a high quality experimental dataset for model validation of ... [more ▼]

Holzkirchen full scale dynamic experiments were conducted in the framework of IEA Annex 58 research program with the aim to obtain and apply a high quality experimental dataset for model validation of full scale buildings. A first experiment was conducted in August 2013. Two identical houses were submitted to a side by side experiment, one with blinds up, one with blinds down. That first experience lasted 42 days including an initialization period, a Randomly Ordered Logarithmic Binary Sequence of heat inputs (ROLBS), and a re-initialization followed by a free-float period. A second experiment was conducted in April 2014 in one of the two houses, with higher levels of heating power in the South oriented zones and imposed indoor temperatures in the North oriented zones. Simulations were performed with EES Engineering Equation Solver using simplified RC dynamic models. The discrepancies observed between simulated results and measured data were first explained through a deeper analysis of thermal bridges, a better assessment of solar heat gains and a better assessment of the air duct heat losses. In the second experiment, the results revealed an underestimation of the building transmission heat losses. A candidate explanation might be the air stratification which would enhance heat losses on the ceiling side. A modelization of the upper and lower room air layers was introduced. The resulting simulated indoor temperature profiles were in accordance with the measurements. A complete breakdown of heat losses and heat gains was computed for both houses, using measured temperatures as input data for the simulation. [less ▲]

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See detailOptimization-based calibration for dynamic building simulation models : a case study
Monetti, Valentina; Davin, Elisabeth ULiege; Fabrizio, Enrico et al

in Mathur, Jyotirmay; Garg, Vishal (Eds.) Proceedings of BS2015: 14th Conference of International Building Performance Simulation Association (2015)

This study presents an original methodology for calibrating building energy models based on monitored data. An optimization-based approach was applied to a monitored test building coupling the building ... [more ▼]

This study presents an original methodology for calibrating building energy models based on monitored data. An optimization-based approach was applied to a monitored test building coupling the building simulation program EnergyPlus with the optimization software GenOpt. An objective function was set to minimize the difference between the simulated and the monitored energy consumption at the hour time scale, varying the building model parameters selected at the beginning as the most influencing. After calibration, the observed heating energy consumption of the case study matched closely the monitored data, the model accuracy was verified according to the MBE and the Cv(RMSE) limit set by the ASHRAE guideline 14. [less ▲]

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See detailVerification of the energy balance of a passive house by combining measurements and dynamic simulation
Rehab, Imane; Andre, Philippe ULiege; Aparecidia Silva, Cleide et al

in Energy Procedia (2015), 78

Passive houses have, at design stage, to fulfill a number of performance criteria. One of them imposes the normalized theoretical heat demand to be limited to 15 kWh/m², year. In operation, it is very ... [more ▼]

Passive houses have, at design stage, to fulfill a number of performance criteria. One of them imposes the normalized theoretical heat demand to be limited to 15 kWh/m², year. In operation, it is very difficult to check, from simple observations or measurements, the real performance of such a house: different energy vectors may be used to meet the space heating as well as the domestic hot water demand, a storage tank may be used and fed by different energy sources (heat pump, direct electricity, solar thermal). The problem is still more complicated if the house is equipped with PV panels which naturally decrease the apparent electrical consumption. In the frame of the IEA Annex 58 project, a passive house was the object of a detailed analysis aiming at estimating the different terms of the energy balance. Some terms were results of direct in situ measurements and unmeasured terms such as solar and internal gains were estimated by dynamic simulation. The combination of measurements and simulation results allowed a reconstruction of a robust energy balance. The paper provides a detailed description of the approach and of each term of the rebuilt energy balance. [less ▲]

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See detailCalibration of building energy simulation models based on optimization: A case study
Monetti, V.; Davin, Elisabeth ULiege; Fabrizio, E. et al

in Energy Procedia (2015), 78

This study applies an optimization-based approach for calibrating building energy models using monitored data. The calibration was carried out on a test building coupling the EnergyPlus energy simulation ... [more ▼]

This study applies an optimization-based approach for calibrating building energy models using monitored data. The calibration was carried out on a test building coupling the EnergyPlus energy simulation tool with the GenOpt optimization tool. The objective function was set to minimize the difference between simulated and monitored energy consumption. For evaluating the model accuracy, the Mean Bias Error (MBE) and the Coefficient of Variation of the RMSE (Cv (RMSE)) were calculated and found consistent with ASHRAE guideline 14 limits for a model to be considered calibrated. © 2015 The Authors. [less ▲]

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See detailSmart Grid Energy Flexible Buildings through the use of Heat Pumps in the Belgian context
Georges, Emeline ULiege; Masy, Gabrielle; Verhelst, Clara et al

in 3rd International High Performance Buildings Conference at Purdue (2014, July)

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See detailSimulation of a vertical ground heat exchanger as low temperature heat source for a closed adsorption seasonal storage of solar heat
Hennaut, Samuel ULiege; Thomas, Sébastien ULiege; Davin, Elisabeth ULiege et al

in Energy Procedia (2014), 48

Get It @ ULg(opens in a new window)|View at Publisher| Export | Download | More... Energy Procedia Volume 48, 2014, Pages 370-379 2nd International Conference on Solar Heating and Cooling for Buildings ... [more ▼]

Get It @ ULg(opens in a new window)|View at Publisher| Export | Download | More... Energy Procedia Volume 48, 2014, Pages 370-379 2nd International Conference on Solar Heating and Cooling for Buildings and Industry, SHC 2013; Freiburg; Germany; 23 September 2013 through 25 September 2013; Code 104547 Simulation of a vertical ground heat exchanger as low temperature heat source for a closed adsorption seasonal storage of solar heat (Conference Paper) Hennaut, S.a , Thomas, S.a, Davin, E.a, Skrylnyk, A.b, Frère, M.b, André, P.a a University of Liège, Building Energy Monitoring and Simulation, Avenue de Longwy 185, 6700 Arlon, Belgium b University of Mons, Energy Research Cente, Boulevard Dolez 31, 7000 Mons, Belgium View references (9) Abstract This paper deals with the simulation of a vertical geothermal heat exchanger as low temperature heat source for a closed adsorption seasonal heat storage. The seasonal storage should allow reaching a nearly 100 % solar fraction for space heating of a "low energy" building". The selected adsorbent and adsorbate are respectively bromide strontium and water. The studied system, including the building and the ground exchanger, is simulated using the dynamic simulation software TRNSYS. Results show that expected performances are reached with a borehole of 100 m. The evaporation temperatures computed are really close to 0°C which might cause some problems. But an advanced research would maybe impose a deeper borehole to avoid cooling the ground on the long term. [less ▲]

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See detailExperimentation and modelling of a small-scale adsorption cooling system in temperatre climate
Thomas, Sébastien ULiege; Hennaut, Samuel ULiege; Maas, Stefan et al

in Wurtz, Etienne (Ed.) Proceedings of the 13th international conference of the international building performance simulation association (2013, July)

This paper describes the results of monitoring campaigns of a solar driven adsorption air-conditioning system. The energy performance figures of the system are computed and the adsorption chiller is ... [more ▼]

This paper describes the results of monitoring campaigns of a solar driven adsorption air-conditioning system. The energy performance figures of the system are computed and the adsorption chiller is modelled also based on measurement. This renewable energy system is able to reach, on a monthly cooling period, 40% energy savings compared to a classical air-conditioning system. Besides, the model built to handle the adsorption thermal behaviour shows performance slightly lower than the manufacturer’s performance map. [less ▲]

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See detailA Decentralized Mechanical Ventilation System with Heat Recovery: Experimental Assessment of Thermal Comfort and Pollutant Removal Ability
Ajaji, Youness; Andre, Philippe ULiege

Conference (2013)

In decentralized mechanical ventilation, air supply being very close to exhaust, a short-circuit from supply towards the extraction point may occur, increasing energy consumption and decreasing air ... [more ▼]

In decentralized mechanical ventilation, air supply being very close to exhaust, a short-circuit from supply towards the extraction point may occur, increasing energy consumption and decreasing air diffusion quality. To estimate this quality together with thermal comfort, we measured in a climatic chamber, thermal comfort parameters and local ventilation effectiveness for temperature, at 12 locations and 3 heights within the occupied zone, for 4 ventilation regimes and 3 thermal configurations of the climatic chamber. We also assessed the system ability to remove carbon dioxide. The results show that the maximum air velocity measured is 0.12m/s, the predicted mean votes fluctuate from -0.8 to - 0.5 and local ventilation effectiveness is from 0.94 to 1. In addition, the decentralized system maintains carbon dioxide concentration below 1250ppm for most configurations tested. The predicted mean votes are quite low because the heating set point is also quite low: 20°C. We conclude that no thermal discomfort can be felt, the system has a great ability to remove pollutants, and the risk that a short-circuit occurs is low. [less ▲]

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See detailLe confort thermique des bâtiments en région tropicale : application du modèle de Fanger au cas des laboratoires de l'université d'Abomey Calavi (Cotonou-Bénin).
Olissan, Aurélien; Kouchade, Clément; Andre, Philippe ULiege et al

Conference (2013)

Fanger dans ses travaux a lié l'indice PMV, vote de confort moyen exprimé par une population d'une ambiance donnée au bilan thermique de l'individu. Ce modèle a été utilisé dans nos travaux précédents, et ... [more ▼]

Fanger dans ses travaux a lié l'indice PMV, vote de confort moyen exprimé par une population d'une ambiance donnée au bilan thermique de l'individu. Ce modèle a été utilisé dans nos travaux précédents, et a permis de déterminer des conditions de confort dans la région côtière du Bénin. Le présent article a pour but de prendre en compte à travers des enquêtes, la sensation réelle thermique des occupants des ambiances étudiées pour faire une adaptation du modèle de Fanger aux conditions climatiques de la région côtière du Bénin. [less ▲]

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See detailNumerical simulation and performance assessment of an absorption solar air-conditioning system coupled with an office building
Thomas, Sébastien ULiege; Andre, Philippe ULiege

in Building Simulation (2012), 5(3), 243-255

To minimize environmental impact and CO2 production associated with air-conditioning, it is reasonable to evaluate the prospects of a clean energy source. Solar energy, via thermal collectors can provide ... [more ▼]

To minimize environmental impact and CO2 production associated with air-conditioning, it is reasonable to evaluate the prospects of a clean energy source. Solar energy, via thermal collectors can provide a part of the heating needs. Moreover, it can drive absorption chiller in order to satisfy the cooling needs of buildings. The objective of the work is to evaluate accurately the energy consumption of an air-conditioning system including a solar driven absorption chiller. The complete simulation environment includes the absorption chiller itself, the cooling tower, the solar collectors field, heater, storage devices, pumps, heating-cooling distribution, emission system and building. A decrease of primary energy consumption of 22% for heating and cooling is reached when using a solar air-conditioning system instead of classical heating and cooling devices. The modelling of each subsystem is detailed. TRNSYS software modular approach provides the possibility to model and simulate this complete system. [less ▲]

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See detailVentilation performance measurement of a decentralized mechanical system with heat recovery using tracer gas decay method
Ajaji, Youness ULiege; Andre, Philippe ULiege

in Proceedings of the 10th international conference Healthy buildings 2012 (2012, July 12)

In decentralized mechanical ventilation, air supply being very close to exhaust, short-circuiting of the supply air towards the extraction point may occur, increasing energy consumption of the system and ... [more ▼]

In decentralized mechanical ventilation, air supply being very close to exhaust, short-circuiting of the supply air towards the extraction point may occur, increasing energy consumption of the system and decreasing air diffusion quality. To estimate this quality together with thermal comfort, we measured in a climatic chamber effectiveness of a local ventilation prototype using tracer gas decay method, as well as air velocity. The results show that air change efficiencies, are higher than 0.5 for 50%, 80%, 100% ventilation regimes, and fluctuate between 0.41 and 0.43 for 20% one. Local air change indexes are higher than 1 for regimes higher than 50%, and lower than 0.89 for 20% one. All measured velocities are lower than 0.08m/s. We conclude that the prototype achieves an acceptable air diffusion quality for nominal ventilation regime. But it is not acceptable under 20%. Measurements of velocities do not show any thermal discomfort. [less ▲]

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See detailModelling of solar thermo-chemical system for energy storage in buildings
Skrylnyk, Alexandre; Courbon, Emilie; Frère, Marc et al

in Proceedings of Innostock 2012 - The 12th International Conference on Energy Storage - 16th to 18 th May 2012 (2012, May)

The goal of this paper is the demonstration of the methodological design principles within theoretical modelling of thermal heat storage apparatus and simulation of inter-seasonal heat storage system. The ... [more ▼]

The goal of this paper is the demonstration of the methodological design principles within theoretical modelling of thermal heat storage apparatus and simulation of inter-seasonal heat storage system. The designing procedure starts from the modelling of thermal plant behaviour, based on the simplifications in the basic hypothesis. Afterwards, a more detailed modelling, involving dynamic aspects and additional features of plant components, is presented. The accomplishment of the designing procedure follows by the optimisation of key parameters of the thermal storage plant. [less ▲]

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See detailEvaluation de la qualité de ventilation d'un système double flux avvec récupération de chaleur, par la méthode de décroissance du gaz traceur
Ajaji, Youness ULiege; Andre, Philippe ULiege

Conference (2012)

Comme les points de soufflage et d’extraction des systèmes de ventilation double flux locaux sont très proches, des courts-circuits de l’air pulsé, vers le point d’extraction peuvent se produire ... [more ▼]

Comme les points de soufflage et d’extraction des systèmes de ventilation double flux locaux sont très proches, des courts-circuits de l’air pulsé, vers le point d’extraction peuvent se produire, augmentant la consommation d’énergie et alternant la qualité de la diffusion de l’air. Afin d’évaluer cette qualité et le confort thermique, nous avons mesuré, en chambre climatique – en supposant les jets isothermes – les efficacités de renouvellement d’air d’un prototype de ventilation double flux locale, par la méthode de décroissance du gaz traceur CO2. Dans cet article, nous justifions le choix du CO2 comme gaz traceur, nous évaluons les efficacités de renouvellement d’air moyennes et locales du prototype étudié, et nous mesurons les vitesses d’air à l’intérieur de la zone d’occupation. Les résultats montrent que la diffusion de l’air est très satisfaisante pour le régime nominal et au-delà. Elle est insuffisante pour le régime de ventilation 20%, mais peut être améliorée. Les mesures de vitesse d’air ne font apparaître aucun inconfort thermique. La suite de notre travail consistera à évaluer le confort thermique pour des jets non isothermes. [less ▲]

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See detailExperimentation and Simulation of a Small-Scale Adsorption Cooling System in Temperate Climate
Thomas, Sébastien ULiege; Hennaut, Samuel ULiege; Maas, Stefan et al

in Energy Procedia (2012), 30

This paper focuses on the analysis of the operation of a solar cooling system based upon an adsorption chiller. The air-conditioned building studied is a laboratory located in a temperate climate region ... [more ▼]

This paper focuses on the analysis of the operation of a solar cooling system based upon an adsorption chiller. The air-conditioned building studied is a laboratory located in a temperate climate region (Belgium). The monitoring reveals thermal and electrical coefficient of performance (COP) of the cooling system for different time scale (10s to 1 month). The whole system including solar collectors, adsorption machine, recooling unit and hot storage is simulated. The models are then confronted to the measurements. Measurement period is shared between 2011 and 2012. Enhancements have been achieved during winter 2011 to have a more efficient system operation. The aim of this experimental work is to describe, for both measurement periods, the influence of operating conditions on the energy efficiency (thermal behavior and electrical consumption). On the simulation point of view, the main objective is to find accurate models for all the components. The adsorption chiller model is not yet precise enough to evaluate the performance of solar cooling in other conditions. [less ▲]

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See detailLe confort thermique des bâtiments en région tropicale : cas de quelques bureaux du rectorat de l'université d'Abomey Calavi (Cotonou-Bénin).
Olissan, Aurelien; Kouchade, Clément; Andre, Philippe ULiege et al

Conference (2012)

Le confort thermique est défini par l'ASHRAE, comme une condition de bien être psycho-physique de l'individu, par rapport à l'environnement dans lequel il vit et travaille. L'évaluation de cette ... [more ▼]

Le confort thermique est défini par l'ASHRAE, comme une condition de bien être psycho-physique de l'individu, par rapport à l'environnement dans lequel il vit et travaille. L'évaluation de cette caractéristique subjective peut être objectivée et quantifiée au moyen d'indices thermiques. Parmi ceux-ci, c'est le PMV (vote moyen prévisible) qui reflète avec la plus grande précision, l'influence des paramètres physiques dont dépend le confort thermique. Les présents travaux ont pour objectif d'évaluer cet indice de confort thermique en région tropicale à partir des mesures dont les premières campagnes sont réalisées dans certains bureaux du bâtiment du rectorat de l'Université d'Abomey Calavi au Bénin. [less ▲]

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See detailPerformance assessment of a small-scale adsorption chiller integrated to an already existing solar heating system
Thomas, Sébastien ULiege; Andre, Philippe ULiege; Maas, Stefan

in Proceedings of 4th International Conference Solar Air-Conditioning (2011, October 12)

In the context of the solar air-conditioning systems analysis, it is crucial to assess system performance by experimentations in real-time conditions. In this way, it is possible to calculate the energy ... [more ▼]

In the context of the solar air-conditioning systems analysis, it is crucial to assess system performance by experimentations in real-time conditions. In this way, it is possible to calculate the energy savings to minimize environmental impact and CO2 production induced by the operation of such a system in buildings operation. It is proposed to measure the thermal behaviour and the energy performance of a smallscale solar air-conditioning system used to cool a laboratory building in the South of Belgium. The experimental system is recently installed and fully instrumented for both thermal and electrical COP computation. Results of two months operation and data analysis are presented in this work. [less ▲]

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See detailDynamic simulation of residential buildings with seasonal sorption storage of solar energy - parametric analysis
Hennaut, Samuel ULiege; Thomas, Sébastien ULiege; Davin, Elisabeth ULiege et al

in ISES solar world congress 2011 - Proceedings (2011, August 28)

This work focuses on the evaluation of the performances of a solar combisystem coupled to seasonal thermochemical storage using SrBr2/H20 as adsorbent/adsorbate couple. The objective is to determine the ... [more ▼]

This work focuses on the evaluation of the performances of a solar combisystem coupled to seasonal thermochemical storage using SrBr2/H20 as adsorbent/adsorbate couple. The objective is to determine the characteristics required for solar system and storage reactor to reach a 100 % solar fraction for a building with a low heating load. The complete system, including the storage reactor, is simulated, using the dynamic simulation software TRNSYS. The influence of some components and parameters of the system is estimated: weather, collectors and storage reactor parameters. [less ▲]

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See detailPré-dimensionnement par simulations dynamiques d’un réacteur de stockage thermochimique assurant l’autonomie d’un système solaire combiné.
Hennaut, Samuel ULiege; Thomas, Sébastien ULiege; Andre, Philippe ULiege et al

in Congrès Français de Thermique 2011 - Energie Solaire et Thermique - Perpignan - 24-27 Mai 2011 (2011, May 24)

Etude du stockage de l’énergie solaire thermique sous forme thermochimique comme moyen d’assurer l’autonomie thermique d’une habitation basse énergie. La surface de capteurs nécessaire et les ... [more ▼]

Etude du stockage de l’énergie solaire thermique sous forme thermochimique comme moyen d’assurer l’autonomie thermique d’une habitation basse énergie. La surface de capteurs nécessaire et les caractéristiques du stockage sont étudiées par simulation dynamique (TRNSYS), de manière générale et pour des couples adsorbant/adsorbat particuliers (CaCl2/H2O et Charbon actif/Méthanol). Un système solaire combiné avec 14,4 m² de capteurs plans et un stockage thermochimique de 12,35 m³ de CaCl2 permet d’assurer l’autonomie thermique d’une habitation « basse énergie » située en Belgique et une grande part de la production d’eau chaude sanitaire (ECS). [less ▲]

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See detailModel validation of a dynamic embedded water base surface heat emitting system for buildings.
Thomas, Sébastien ULiege; Andre, Philippe ULiege; Franck, Pierre-Yves

in Building Simulation (2011), 4

A numerical model is developed to assess the static and dynamic operations of a new kind of floor heat emitter. Surface floor heating systems are widely used to achieve better comfort conditions in ... [more ▼]

A numerical model is developed to assess the static and dynamic operations of a new kind of floor heat emitter. Surface floor heating systems are widely used to achieve better comfort conditions in residential and tertiary building sector. Classical floor heating systems have a low thermal response while the emitting device studied in this paper is highly reactive. It allows comfort enhancement and energy savings. A finite element method based software COMSOL Multiphysics is applied to solve the heat equation. This work focuses on the thermal behaviour of the emitter itself, but does not include a building model. A test bench has been built for this application to verify the numerical model. Both computational and experimental results demonstrate the benefits of this new heating and cooling device. [less ▲]

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