References of "Abrahams, Pauline"
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See detailPositive Energy Houses, envelope and systems integrated optimization by means of dynamic simulations
Abrahams, Pauline ULiege; Scheuren, Claude ULiege; Andre, Philippe ULiege

Conference (2018, December 10)

In the framework of the Interreg IV-A Greater Region project called « VallEnergie » four projects of residential houses with “positive energy performance” were analysed. The main purpose of the study was ... [more ▼]

In the framework of the Interreg IV-A Greater Region project called « VallEnergie » four projects of residential houses with “positive energy performance” were analysed. The main purpose of the study was to define the optimal choices in terms of envelope and energy system in the building in order to reach the high performance level of a “Positive Energy House” (PEH in this paper). The first step was to determine what was meant by the term “Positive Energy House” and to define criteria used to characterize energy and comfort performance of such house. The concept of « Positive Energy house » defined in the project had to be in adequacy with European definition, therefore a complete state of the art of NZEB concept in Europe was carried out. The collected information was used to establish the specifications document of “PEH” in concertation with the project consortium. By means of TRNSYS17 software different sets of variants were assessed by thermal dynamic simulations and compared in order to define the optimal choice of insulation strategy and heating, DHW and Renewable Energy production systems configuration to reach the PEH performance as defined in the specification document of “VallEnergie” project. The paper will present the selected hypotheses of the simulation models, describe the applications that were developed in TRNSYS and discuss the results of the different variants. [less ▲]

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See detailEvaluation of the flexibility potential of buildings in the Greater Region to contribute to the management of the grid: study case for two reference buildings in Belgium
Abrahams, Pauline ULiege; Botquin, Grégoire ULiege; Andre, Philippe ULiege

in Proceedings of the 31st International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (2018, June)

The Interreg Va Pth4GR²ID project (“Power to Heat For the Greater Region’ Renewables Integration and Development”) focuses on the determination of an optimal solution at a technical, economic and ... [more ▼]

The Interreg Va Pth4GR²ID project (“Power to Heat For the Greater Region’ Renewables Integration and Development”) focuses on the determination of an optimal solution at a technical, economic and ecological point of view for the use of heat pumps in Greater Region (Wallonia BE, Luxembourg LU, Grand-Est FR, Rhineland-Palatinate and Saarland DE) as storage solution to absorb the part of local renewable electrical production that could not be injected into the grid (because of grid generation congestion risks). The decision to work with this kind of solution is justified because of the important part of total energy consumed in the residential sector for buildings heating. The present paper focuses on the flexibility potential evaluation of two residential buildings in order to evaluate their contribution to the electrical grid management in the Greater Region. The work is based upon simulations which are run with TRNSYS software. The capacity of buildings to deal with a heating system cut-off strategy during winter is assessed by means of comfort and energy performance indicators. The goal of this study is to assess in which way the selected buildings will respond to a heating cut-off (in case of grid congestion, the heat pumps will be switched off) and to analyse their “flexibility” as a function of design parameters series. The flexibility takes into account the comfort and the energy aspect of buildings performance. The first part of this paper presents the method used to select the reference buildings in Wallonia and the second part is dedicated to the evaluation their flexibility according to several heating management scenarios. This evaluation is realized by means of specific performance indicators which were developed the project. [less ▲]

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See detailCalibration of a building simulation model to evaluate the overheating risk in summer period – case study of a passive house in Belgium
Abrahams, Pauline ULiege; Rehab, Imane; Andre, Philippe ULiege

in 30th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 2017) (2017, July)

A method based upon a calibrated model of building is proposed here to evaluate the performance in terms of thermal comfort during summer in a passive house. A model of the house was developed and this ... [more ▼]

A method based upon a calibrated model of building is proposed here to evaluate the performance in terms of thermal comfort during summer in a passive house. A model of the house was developed and this model was used to determine optimal solutions (cost and efficiency) to reduce or avoid the overheating that could occur in the building. The first step of this work consisted in the calibration of the thermal response of the simulation building model by comparison with the internal temperatures measured in the passive house during summer period. The simulations took into account the occupancy in the house and several other parameters in order to match the temperature sensors data of the house. These parameters were adjusted thanks to sensitivity analysis. An assessment of the accuracy of the simulated model was conducted by computation of sensitivity indicators. When the results of calibration showed a good matching between reference and simulated buildings the simulations were used to assess the best solution to reduce the overheating in passive house rooms which is occurring when the percentage of overheating time is over 5% (Passive House Platform standard in Belgium). [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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