References of "Andre, Philippe"
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See detailIntégration système et simulation
Hennaut, Samuel ULiege; Davin, Elisabeth ULiege; Baiwir, Romain ULiege et al

Scientific conference (2017, September 20)

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See detailAnalysis of HVAC indoor terminal units by using T-Q diagram : an experimental study
Ajaji, Youness; Andre, Philippe ULiege

in Heiselberg, Per (Ed.) CLIMA 2016 - proceedings of the 12th REHVA World Congress : volume 10. (2016, May)

The T-Q diagram is a widely used tool in the industry to optimize the design and the number of heat exchangers in a process. The principle consists in minimizing the quantity ∫TdQ in WK called entransy ... [more ▼]

The T-Q diagram is a widely used tool in the industry to optimize the design and the number of heat exchangers in a process. The principle consists in minimizing the quantity ∫TdQ in WK called entransy dissipation. We performed an experimental study in climatic chamber in order to apply the T-Q diagram method for the choice of the best indoor terminal device in an office submitted to a summer climate in Brussels and for the choice of the operating parameters water flow rate and water temperature. We tested four terminal units coupled to a cooling water tank by using a reversible air-water chiller: a mixing ventilation, a displacement ventilation, the mixing ventilation combined with a low inertia hydronic radiant floor, the displacement ventilation combined with the low inertia hydronic radiant floor. The tests were performed under stationary conditions. We plot the T-Q diagram and we assessed the entransy dissipations for each system and various operating parameters. We measured thermal comfort within the climatic chamber. Tests showed that air systems were less efficient than ventilation combined with radiant floor and that the combination of displacement ventilation with radiant floor was the best system. The study also showed that entransy dissipation values represented the real quality of the indoor terminal units. [less ▲]

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See detailEnergy performance of buildings : bridging the gap between research and practice
Masy, G.; Ajaji, Youness; Abrahams, Pauline ULiege et al

in Heiselberg, Per Kvols (Ed.) CLIMA 2016 - proceedings of the 12th REHVA World Congress : vol. 6 (2016, May)

A method to bridge the gap between research and practice, as far as estimation of the building envelope Heat Loss Coefficient is concerned, is to perform measurement of indoor temperature profiles during ... [more ▼]

A method to bridge the gap between research and practice, as far as estimation of the building envelope Heat Loss Coefficient is concerned, is to perform measurement of indoor temperature profiles during unoccupied periods when the solar heat gains are sufficient to reach significant indoor-outdoor temperature differences. An observation of indoor temperature profiles was conducted during summer 2014 in a passive house located in Belgium. The observation includes periods with and without occupancy. Occupants were asked to describe their behavior regarding windows opening, closing of external blinds, opening of internal doors. Electric devices were listed and the electricity consumption profile was characterized during occupancy and no occupancy. A calibration process is performed in order to reproduce the global heat balance of the whole building and the zone by zone heat balance. The calibrated model provides an estimation of the Building Heat Loss Coefficient. The influence of the assumptions related to occupants’ behavior in summer is confirmed and recommendations are made to better describe that behavior in terms of use of mechanical ventilation, internal doors opening and use of external blinds. [less ▲]

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See detailAbout the use of CO2 as tracer gas for identification of air renewal; combination with co-heating test
Andre, Philippe ULiege; Aparecida Silva; Davin, Elisabeth ULiege et al

in Heiselberg, Per Kvols (Ed.) CLIMA 2016 - Proceedings of the 12th REHVA World Congress : volume 5 (2016)

Three types of tracer gas test are, until now, mentioned in international standards: Injection at constant indoor concentration, injection at constant flow rate and transient injection followed by a ... [more ▼]

Three types of tracer gas test are, until now, mentioned in international standards: Injection at constant indoor concentration, injection at constant flow rate and transient injection followed by a recording of the decontamination curve. A fourth method is proposed in this paper: it is based on the same scenario as the third method, but with weighting of the mass of tracer gas (CO2) injected and integration of the curve of indoor concentration on the whole testing period. The concentration peak is used to identify the “effective” volume of the building zone considered; this volume, associated to the final concentration, is used to calculate the amount of CO2 remaining inside the zone at the end of the test. The total mass of renovation air is then deduced from the corresponding CO2 mass balance. The CO2 can be injected from a bottle or directly produced by combustion on site. In the latter case, the tracer gas method is combined with a co-heating test. It can be done, for example, with a current camping butane cooker: From the weighting of this device and continuous recording of air temperature, CO2 concentration and humidity ratio, three significant (energy, CO2 and water) balances are established in such a way to verify and tune a reference simulation model of the building zone. [less ▲]

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See detailSupport for energy and comfort management in an office building using smart electrochromic glazing : dynamic simulations
Ajaji, Youness; Andre, Philippe ULiege

in Mathur, Jyotirmay; Garg, Vishal (Eds.) Proceedings of BS2015 : 14th conference of IBPSA (2016)

] In this research, we look for a control strategy of the electrochromic windows, depending on the measurement of the vertical outdoor illuminance and the outdoor temperature, for an efficient highly ... [more ▼]

] In this research, we look for a control strategy of the electrochromic windows, depending on the measurement of the vertical outdoor illuminance and the outdoor temperature, for an efficient highly glazed office building in Brussels. We simulate this building in TRNSYS. We implement a Perez model in TRNSYS to assess the vertical diffuse outdoor illluminance. As the building is equipped with a dimmable lighting system, we assess the average indoor illuminance. We simulate the switching dynamics of the elctrochromic window and we implement a control strategy. Finally, we evaluate the primary energy consumption due to HVAC and lighting, the risk of overheating and the average indoor illuminance. [less ▲]

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

in Science and Technology for the Built Environment (2015), 21(6), 800-811

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See detailEtude des besoins énergétiques du chauffage et du refroidissement d'un bâtiment administratif au Maroc.
Yessouf, R.; Mezrhab, A.; Andre, Philippe ULiege

Conference (2015, April)

Le gouvernement marocain vise à réaliser une économie d’énergie primaire d’environ 12%à l’horizon 2020 en mettant en place un plan d’efficacité énergétique dans les différents secteurs économiques. En ... [more ▼]

Le gouvernement marocain vise à réaliser une économie d’énergie primaire d’environ 12%à l’horizon 2020 en mettant en place un plan d’efficacité énergétique dans les différents secteurs économiques. En effet, le secteur de bâtiment est un gros consommateur d’énergie, mais en même temps possède le plus fort potentiel d’amélioration de l’efficacité énergétique au Maroc. C’est dans cette perspective s’inscrit ce travail. En considérant un bâtiment administratif type, l’étude a été effectuée sous le logiciel TRNsys pour calculer le bilan énergétique (besoins annuelles de chauffage et de refroidissement) de cette construction qui ne contient pas des mesures d’efficacité énergétique dans les six zones climatiques du Maroc. [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 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 detailEnergy performance charactirisation of the test case "twin house" in Holzkirchen, based on Trnsys simulation 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)

In the frame of the IEA Annex 58 project, this paper presents an exercise of building energy performance characterization based on full scale dynamic measurements. First focus of the exercise is the ... [more ▼]

In the frame of the IEA Annex 58 project, this paper presents an exercise of building energy performance characterization based on full scale dynamic measurements. First focus of the exercise is the verification and validation of the numerical TRNSYS BES-model of the case study test house in Holzkirchen. Second focus is on the modelling of the house through a second order inverse “grey box” model in order to determine reliable performance indicators which include UA-value, total heat capacity, and solar aperture. Final issue is the comparison of predicted indoor temperatures of free floating period, results of TRNSYS and “grey box” models simulation. [less ▲]

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See detailThermal comfort and visual comfort in an office building equipped with smart electrochromic glazing : an experimental study
Ajaji, Youness; Andre, Philippe ULiege

in Energy Procedia (2015), 78

The study aims to experimentally assess visual comfort and overheating in a highly glazed office equipped with electrochromic windows which are controlled according to an algorithm previously developed ... [more ▼]

The study aims to experimentally assess visual comfort and overheating in a highly glazed office equipped with electrochromic windows which are controlled according to an algorithm previously developed and optimized using dynamic simulation. To assess visual comfort we built two scale models of an office localized in the south of Belgium. The first one is equipped with an electrochromic window, the second one with a reference window. To assess the risk of overheating, experimental tests were performed in a climatic chamber, using an emulation of the dynamic solar gains, the internal gains and the outdoor climate in the buffer zone surrounding the climatic chamber. [less ▲]

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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 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 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 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 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 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 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: An International Journal (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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