References of "Gendebien, Samuel"
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See detailInvestigation of a single room ventilation heat recovery exchanger under frosting conditions: Modeling, experimental validation and operating strategies evaluation
Gendebien, Samuel ULiege; Parthoens, Antoine ULiege; Lemort, Vincent ULiege

in Energy and Buildings (2019), 186

This paper tackles the issue of frost formation in air-to-air heat recovery devices dedicated to single room ventilation by means of both numerical simulations and experimental approaches. In such heat ... [more ▼]

This paper tackles the issue of frost formation in air-to-air heat recovery devices dedicated to single room ventilation by means of both numerical simulations and experimental approaches. In such heat exchangers, it is commonly known that the formation of a frost layer on the surface generates an additional thermal resistance and a flow section reduction, which leads to an overall degradation of the overall unit performance. This paper proposes a three-zone model, considering a dry, a wet and a frost zone, by determining the location of moving boundaries. Each zone is handled independently and the relative proportion of each zone is determined by means of the exchanger wall temperature. Besides this frost model, a defrost model is also envisaged. Once validated with experimental data collected on a U-flow-type heat exchanger, the developed model is used to implement different strategies to reduce or prevent frost formation in the exchanger. Based on three different criteria, these strategies are compared with each other to evaluate their benefits and drawbacks. The criteria give information on the energy efficiency of the ventilation, on the air renewal quality and on the pressure balance between the inside and the outside of the building. [less ▲]

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See detailDevelopment of multi-zone heat exchanger model under frost and defrost conditions
Parthoens, Antoine ULiege; Gendebien, Samuel ULiege; Lemort, Vincent ULiege

in Proceedings of ECOS 2018 (2018, June)

Global warming is now recognized by the major part of the scientific community. An important issue is the carbon dioxide emissions. The residential area is one major impacting sector, accounting for 30 ... [more ▼]

Global warming is now recognized by the major part of the scientific community. An important issue is the carbon dioxide emissions. The residential area is one major impacting sector, accounting for 30% of the final energy consumed (in Europe). A solution to reduce heat losses due to ventilation is single room ventilation with heat recovery. The objective of this paper is to present the development of a model for the design of a heat exchanger implemented in this kind of unit. The proposed modelling is a multi-zone model with a moving boundary. It allows to consider completely dry, partially wet or completely wet regimes on the stale air side. The boundary between the different zones is determined by means of the exchanger wall surface temperature. This model can be extended to frost conditions by adding a new “frost zone”. The formation of a frost layer on the surface generates an additional thermal resistance as well as a fouling inside ducts. Consequently, it reduces the flow section and the air flow rate for a given fan’s rotational speed. The frost quantity may increase until it blocks the passage ways for exhaust air and stops completely the airflow. The aim of this paper is to introduce the new multi-zone model taking into account the frost formation as well as defrost phase and predicting the impact on the hydraulic and thermal performance. This model is validated on the basis of some experiments done on an actual air-air heat exchanger under frost conditions. These experiments also reveals the limitations of the model. [less ▲]

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See detailDesigning an air-to-air heat exchanger dedicated to single room ventilation with heat recovery
Gendebien, Samuel ULiege; Martens, Jonathan; Prieels, Luc et al

in Building Simulation (2018), 11(1), 103-113

The present paper focuses on the development steps of heat exchangers dedicated to single room ventilation unit with heat recovery (SRVHR) by proposing a numerical approach. A methodology is suggested in ... [more ▼]

The present paper focuses on the development steps of heat exchangers dedicated to single room ventilation unit with heat recovery (SRVHR) by proposing a numerical approach. A methodology is suggested in order to determine the best trade-off between hydraulic and thermal performance given a specific geometry. The methodology consists in a mapping of the coefficient of performance (COP) of the unit. The latter is defined as the ratio between recovered heat and the fan energy use, given a specific indoor/outdoor temperature difference. However, the energy performance should not be the only criterion to be taken into account in the frame of the design steps of a heat recovery exchanger: technical, economic and acoustic aspects should also be considered. This numerical methodology is illustrated by means of a real example of a newly developed heat exchanger dedicated to a SRVHR. The optimization is first performed while using a semi-empirical model (based on the use of correlations and on a spatial division of the studied heat exchanger). The semi-empirical model allows for the creation of a COP map in order to identify the most effective geometry parameters for the heat exchanger. The decision concerning the final geometry is made accounting for the so-called technical, economic and acoustic considerations. A discussion on some parameters needed for the COP establishment is also proposed. [less ▲]

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See detailPerformance analysis of a mini exhaust air heat pump integrated into a low energy detached house: experimental on-site performance
Ransy, Frédéric ULiege; Sartor, Kevin ULiege; Gendebien, Samuel ULiege et al

in Proceedings of the 5th International High Performance Buildings Conference at Purdue (2018)

This paper presents the on-site performance of a mini exhaust air heat pump integrated into a low energy detached house situated in Belgium. The system consists of five components: a simple exhaust ... [more ▼]

This paper presents the on-site performance of a mini exhaust air heat pump integrated into a low energy detached house situated in Belgium. The system consists of five components: a simple exhaust ventilation system, an exhaust air heat pump, a backup electrical resistance for space heating only, a domestic hot water storage tank and fan-coil units to heat the building. In that system, the heat source of the heat pump is the air from the ventilation system and the heat pump heating capacity is limited to 1500 W. During the night, the exhaust air heat pump produces the sanitary hot water, which is stored in a water tank. Consequently, the totality of the domestic hot water is produced by the heat pump. During the day, the heat pump can also be used to heat the building. Nevertheless, only a part of the energy requirements related to heating are covered by the machine, due to the limited heating capacity. The remaining heating requirements are covered by the backup electrical resistance. For this reason, this machine is particularly suitable for apartment buildings characterized by a low heating demand and a significant energy demand related to domestic hot water production. In the first part of the paper, the characteristics of the building case study and the different components of the system are presented. The second part of the paper describes the sensors placed in the building used to measure the on-site performance of the machine. In the third part of the paper, the on-site performance of the machine is presented. The influence of the main variables (exhaust water temperature, supply air temperature, outside temperature) on the performance is also discussed. In the last part of the paper, the performance of the whole system is estimated for a typical meteorological year. The estimation is based on the Energetic Performance of Building certificate of the building, and on empirical relationships established with the on-site performance of the machine. [less ▲]

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See detailComparison of a dynamic model and experimental results of a residential heat pump with vapor injection and variable speed scroll compressor
Dechesne, Bertrand ULiege; Gendebien, Samuel ULiege; Lemort, Vincent ULiege et al

in PROCEEDINGS OF ECOS 2017 (2017, July)

The first part of this paper presents a Modelica-based dynamic model of the system. Finite-volume models are used for the heat exchangers and the evaporator model takes into account frost formation. A ... [more ▼]

The first part of this paper presents a Modelica-based dynamic model of the system. Finite-volume models are used for the heat exchangers and the evaporator model takes into account frost formation. A thermodynamic model of the vapor injection scroll compressor is developed using empirical correlations for the volumetric efficiency, isentropic efficiency and the ratio between the injection and suction mass flow rate. The second part presents experimental results of a vapor injection and variable speed scroll compressor air to water residential heat pump. The unit is a 10kW residential system working with R410a as working fluid and capable of providing floor heating and domestic hot water. It was tested in a controlled environment in order to achieve a wide range of outdoor, including frosting conditions, and indoor conditions. The model predictions and experimental results are compared in order to validate the component models in steady state. The experimental investigations showed that there is room for improvement on the control side of the system and the developed model can be used in order to develop model based control of the injection and outdoor electronic expansion valves. [less ▲]

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See detailPERFORMANCES D’UNE MINI POMPE À CHALEUR RÉVERSIBLE FONCTIONNANT SUR L’AIR EXTRAIT : ÉTUDE NUMERIQUE ET EXPERIMENTALE
Ransy, Frédéric ULiege; Gendebien, Samuel ULiege; Lemort, Vincent ULiege

Poster (2017, May 22)

La majeure partie de la consommation d’énergie des immeubles à appartement dits « basse énergie » est liée à la production d’eau chaude sanitaire et aux pertes par ventilation. De plus, ces immeubles sont ... [more ▼]

La majeure partie de la consommation d’énergie des immeubles à appartement dits « basse énergie » est liée à la production d’eau chaude sanitaire et aux pertes par ventilation. De plus, ces immeubles sont soumis à un risque de surchauffe non négligeable en été. Afin de minimiser leur consommation d’énergie, les systèmes HVAC utilisés dans ces bâtiments se doivent d’être performants et multitâches. Dans cette optique, l’Université de Liège teste actuellement une mini-pompe à chaleur réversible sur air extrait. Cet article présente les résultats expérimentaux obtenus en laboratoire et démontre quelles sont les variables qui influencent les performances de cette machine. Un modèle polynomial est également proposé. [less ▲]

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See detailDEVELOPPEMENT D’UN MODELE DE SYSTEME DE CLIMATISATION AUTOMOBILE MULTI-EVAPORATEURS
Gillet, Thomas ULiege; Gendebien, Samuel ULiege; Lemort, Vincent ULiege et al

Conference (2017, May 22)

La modélisation numérique d’un climatiseur d’automobile multi-évaporateurs, composé de deux évaporateurs et d’un refroidisseur d’eau, a été réalisée à l’aide du logiciel LMS Imagine.Lab Amesim® 1D avec le ... [more ▼]

La modélisation numérique d’un climatiseur d’automobile multi-évaporateurs, composé de deux évaporateurs et d’un refroidisseur d’eau, a été réalisée à l’aide du logiciel LMS Imagine.Lab Amesim® 1D avec le fluide frigorigène R-134a. Un banc d’essai capable de reproduire les conditions extérieures d’un climatiseur automobile a été conçu afin de tester l’architecture de cette machine multi-évaporateurs avec le fluide frigorigène R-1234yf. Les bilans thermiques des premiers résultats expérimentaux sont analysés et présentés. Afin d’illustrer la complexité du contrôle d’une telle architecture en régime dynamique, l’activation d’une vanne électromagnétique dans la boucle batterie du banc d’essais est présentée. Enfin, une perturbation de type échelon a été générée dans le modèle numérique afin de vérifier si les phénomènes transitoires observés expérimentalement sont reproduits. [less ▲]

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See detailExperimental investigation and dynamic modeling of an air-to-water residential heat pump with vapor injection and variable speed scroll compressor
Dechesne, Bertrand ULiege; Gendebien, Samuel ULiege; Lemort, Vincent ULiege et al

in 12th IEA Heat Pump Conference Proceedings (2017, May)

This paper presents experimental results of a residential air source heat pump using a scroll compressor with variable speed and vapor injection. The system is modeled using the Modelica language and a ... [more ▼]

This paper presents experimental results of a residential air source heat pump using a scroll compressor with variable speed and vapor injection. The system is modeled using the Modelica language and a comparison with the experimental results is performed. It was shown that there is still room for improvement on the control of the system. In fact, the tested gain scheduled PID controller showed limitation to maintain a low and steady superheat on both the suction and injection lines due to dynamics associated to the vapor split line or heat exchangers. The presented model of the system could be used in order to develop model based control and increase the system performances. [less ▲]

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See detailEtude expérimentale et numérique d'un échangeur destiné à la récupération de chaleur fatale sur bancs d'essais de moteurs aéronautiques
Gendebien, Samuel ULiege; Guillaume, Ludovic ULiege; Bellolio Domke, Sebastian Andres ULiege et al

in Colloque Inter-universitaire Franco-Québécois (CIFQ 2017), 22-24 mai 2017, Saint-Lô, France (2017, May)

Aujourd’hui, d’importants efforts sont réalisés dans divers secteurs afin de diminuer la consommation en énergie. En ce qui concerne le secteur aéronautique, de nombreux tests sont réalisés sur les ... [more ▼]

Aujourd’hui, d’importants efforts sont réalisés dans divers secteurs afin de diminuer la consommation en énergie. En ce qui concerne le secteur aéronautique, de nombreux tests sont réalisés sur les moteurs afin d’assurer la sécurité du transport aérien. Dans ce contexte, il a été envisagé de récupérer, recycler et valoriser l’énergie produite par le moteur au moyen d’un échangeur placé dans la cheminée d’évacuation des gaz. Pour ce faire, un prototype de modèle réduit d’échangeur récupératif sur gaz de combustion (gaz/eau ou gaz/huile) a été conçu, fabriqué et testé. Ce papier présente les caractéristiques du modèle réduit de l’échangeur développé spécifiquement pour cette application. L’ensemble du banc d’essais et le système de mesure mis en place afin de caractériser les performances de l’échangeur sont décrits. Une analyse des résultats expérimentaux est présentée. Les tests sont notamment divisés en deux parties : établissement des performances en régime monophasique et diphasique. Notons également que les performances hydrauliques de l’échangeur ont été expérimentalement déterminées. Un modèle numérique de type semi-empirique est proposé pour prédire les performances de l’échangeur. Ce dernier nécessite un calibrage des paramètres au moyen des données expérimentales afin de prédire les performances de l’échangeur sous une grande plage de conditions opératoires. Une comparaison entre résultats numériques et expérimentaux est finalement présentée. [less ▲]

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See detailRÉSULTATS EXPERIMENTAUX ET MODÉLISATION DYNAMIQUE D’UNE POMPE À CHALEUR AIR-EAU UTILISANT UN COMPRESSEUR SPIRO-ORBITAL À VITESSE VARIABLE ET INJECTION DE VAPEUR
Dechesne, Bertrand ULiege; Gendebien, Samuel ULiege; Lemort, Vincent ULiege et al

in CIFQ 2017 proceedings (2017)

Cet article présente les résultats expérimentaux d’une campagne de tests et le modèle de simulation dynamique d’une pompe à chaleur résidentielle air-eau fonctionnant avec un compresseur spiro-orbital (« ... [more ▼]

Cet article présente les résultats expérimentaux d’une campagne de tests et le modèle de simulation dynamique d’une pompe à chaleur résidentielle air-eau fonctionnant avec un compresseur spiro-orbital (« scroll ») à vitesse variable et injection de vapeur. Il s’agit d’un système résidentiel de 10kW fonctionnant avec du R410a comme fluide de travail, et capable d’alimenter un système de chauffage et de produire de l'eau chaude sanitaire. Les performances du système à charge partielle, le contrôle de la surchauffe ainsi que la validation en régime étable du modèle de simulation sont présentés. [less ▲]

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See detailProjets de Récupération de chaleur fatale suivis par l’ULg
Lemort, Vincent ULiege; Le, Van Long; Gendebien, Samuel ULiege et al

Conference (2017)

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See detailDescription of a Modelica-based thermal building model integrating multi-zone airflows calculation
Ransy, Frédéric ULiege; Gendebien, Samuel ULiege; Lemort, Vincent ULiege

Conference (2016, May 23)

Nowadays, in newly built housings, energy losses due to the ventilation can represent up to 50 % of the total building energy consumption. As a result, heat recovery ventilation units are widely used in ... [more ▼]

Nowadays, in newly built housings, energy losses due to the ventilation can represent up to 50 % of the total building energy consumption. As a result, heat recovery ventilation units are widely used in order to save primary energy and different control strategies for ventilation systems are investigated. For instance, demand control ventilation sounds like a promising solution to decrease the energy impact of the ventilation system in the residential sector. An accurate building model integrating the influence of ventilation (so called thermo-aeraulic building model) is necessary in order to investigate the control and the impact of the ventilation system on a yearly basis. The aim of the present paper consists in a description of a combined multi-zone airflow network model and thermal building model implemented in the Modelica language. The thermal model is a simplified dynamic model using equivalent thermal resistance and capacity. The airflow network is based on the traditional electrical circuit analogy. The model can be used for ventilation systems design, infiltration rate calculation, inside air quality calculation, energy consumption calculation, etc. The first part of the paper details the multi-zone thermal building model. The results obtained from the model are compared to experimental in situ results collected in the typical single family house test facilities. Those experimental results have been obtained in the frame of the IEA-EBC Annex 58. The second part of the paper introduces the multi-zone airflow network building model. Obtained model results are compared with the results provided by a typical multizone airflow analysis software, for a simple three zones test case. The third part of the paper describes the coupling between both thermal and airflow models. The different numerical problems encountered are described and solutions are discussed. [less ▲]

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See detailIntroduction aux échangeurs de chaleur
Declaye, Sébastien ULiege; Gendebien, Samuel ULiege; Lemort, Vincent ULiege

Conference (2016, April 14)

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See detailA, B, C, D ventilation systems: comparison
Gendebien, Samuel ULiege

Conference (2015, November 19)

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See detailPerformances of a simple exhaust mechanical ventilation coupled to a mini heat pump: modeling and experimental investigations
Ransy, Frédéric ULiege; Gendebien, Samuel ULiege; Lemort, Vincent ULiege

Conference (2015, September 24)

According to the European directive 2012/27/EU of October 2012 on energy efficiency, buildings represented 40 % of the EU’s final energy consumption in 2011. The major part of this energy consumption is ... [more ▼]

According to the European directive 2012/27/EU of October 2012 on energy efficiency, buildings represented 40 % of the EU’s final energy consumption in 2011. The major part of this energy consumption is due to the residential sector for space heating and domestic hot water production. Moreover, buildings are crucial to achieve the EU objective of reducing greenhouse gas emissions by 80-95 % by 2050 compared to 1990. In order to reduce these greenhouse gas emissions, retrofit measures regarding insulation and air-tightness have to be taken. However, such improvements of the building envelope lead to a relative increase in consumption related to ventilation. Indeed, according to Orme (2001), Roulet et al. (2001) and Fouih et al. (2012), the heating demand due to ventilation can reach more than 50 % of the total building heating demand for new and retrofitted buildings. To reduce the energy consumption due to ventilation, exhaust air heat pumps (EAHPs) can be used instead of the traditional heat recovery with an air-to-air heat exchanger. EAHPs recover heat from the exhaust air of the ventilation system to produce domestic hot water and space heating. According to Fehrm et al. (2002), this technology is already widely used in the northern countries such as Germany and Sweden. In fact, according to Fracastoro et al. (2010), efficiencies of EAHPs are higher than those obtained with outside air or geothermal heat pumps in certain conditions, whatever the climate location. Berg et al. (2010) have monitored three houses in Sweden equiped with exhaust air heat pumps. The seasonal performance factor (SPF) values were all within the range 1.4-1.7. This factor takes into account the energy consumption of the heat pumps and the auxiliary heating systems. A 17 kW exhaust air heat pump has also been tested by Mikola et al. (2014). The measured SPF for the heat pump only (without taking into account the auxiliary heating system) was about 2.9-3.4 in winter and 3 in the summer. Exhaust air heat pumps coupled with simple exhaust mechanical ventilation systems have many advantages compared to traditional balanced systems with heat recovery: • Only one fan is necessary and the duct system is simpler. Consequently, EAHPs are suitable for retrofitted buildings. • The heat pump can provide the whole part of the heating demand related to domestic hot water and 50 % of the heating demand related to space heating, according to Fracastoro et al. (2010). • The heat pump can also provide active cooling by inversing the refrigerating cycle. • The heat pump performance is high and remains constant with outdoor temperature changes since the temperature of the heat sink is constant (20°C). As a result, the system is cost-effective. • The system is compact, quiet and requires little maintenance. In the present paper, the energetic performances of an exhaust air heat pump are assessed through numerical and experimental studies. The thermal capacity of the machine is 1.5 kW when the inside air temperature is 20°C and the outside water temperature is 35°C. The heat pump is therefore ideally suited for new or retrofitted buildings. The system including a mechanical exhaust ventilation system and an exhaust air heat pump is first presented. Secondly, the heat pump model used afterwards to determine the heat pump seasonal performance factor is described. Thirdly, the model is calibrated to fit the measurement data. Finally, the heat pump model is coupled to a building model to determine the annual performance of the system. The system is compared to a traditional balanced ventilation system with heat recovery in terms of primary energy consumption, for different heating and DHW production systems (electric heater, heat pump, gas condensing boiler). [less ▲]

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See detailDevelopment of a compact single room ventilation unit with heat recovery dedicated to tertiary buildings
Gendebien, Samuel ULiege; Martens, Jonathan; Prieels, Luc et al

Conference (2015)

In the frame of the European project called Bricker, a new prototype of single room ventilation with heat recovery has been developed. This new unit is supposed to be installed in class rooms of an ... [more ▼]

In the frame of the European project called Bricker, a new prototype of single room ventilation with heat recovery has been developed. This new unit is supposed to be installed in class rooms of an educational institution. This paper deals with the development of the first prototype of this unit. An empirical model of such device is also proposed in order to be coupled with a building model. This aims at determining the seasonal performance of the device and thus the potential energy saving (compared to other technologies) resulting from its use. The first part of the paper presents the specifications and the final characteristics of the developed device. In this context, a by-pass for free cooling in summer conditions as well as the strategies under frosting conditions are described. Secondly, the coefficient of performance (COP) of such device is recalled. In the early stage of the development process, the COP is determined based on the manufacturer data of the heat recovery exchanger and the fans. The coupling between fan curve and the predicted hydraulic performance of the unit allows for determining a first approximation of the fans electrical consumption for several delivered flow rates. The third part of the paper focuses on the experimental investigations carried out in order to determine the flow rate really delivered by the unit. Electrical consumptions of several flow rates are also measured in order to characterize the COP of the unit in those conditions. Finally, a comparison between the measured and the predicted performance based on manufacturer data has been realized in terms of COP. A performance map based on experimental results is proposed in order to be coupled with a building model. [less ▲]

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See detailContributions to the development of a single room ventilation with heat recovery
Gendebien, Samuel ULiege

Doctoral thesis (2014)

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See detailMethodology to characterize a residential building stock using a bottom-up approach: a case study applied to Belgium
Gendebien, Samuel ULiege; Georges, Emeline ULiege; Bertagnolio, Stéphane et al

in International Journal of Sustainable Energy Planning and Management (2014)

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