References of "Lebrun, Jean"
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See detailAbout the use of simulation models and of functional tests in commissioning of HVAC systems.
Adam, Ch.; Andre, Philippe ULg; Aparecida, Cl. et al

in Proceedings of the International conference Energy efficient technologies in indoor environment (2005, September)

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See detailPolygeneration and HVAC
Andre, Philippe ULg; Adam, Ch.; Aparecida Silva, Cl. et al

Conference (2005, April)

Decentralized cogeneration may help in energy conservation if a large enough amount of heat can be actually recovered. This restriction is becoming more and more severe because of the growing ... [more ▼]

Decentralized cogeneration may help in energy conservation if a large enough amount of heat can be actually recovered. This restriction is becoming more and more severe because of the growing effectiveness of modern power plants. Re-conversion of heating into cooling is not competitive with the use of modern vapor compression chillers. It may just help to extend a little the time during which the co-generation plant can be effectively used. A co-generation plant should not be sized above 30% of the maximal heating power in order to stay energy efficient. The results of a long term case study are summarized in the paper. These results show the incidence of the plant over-sizing : in this case, the system is consuming more than a classical solution [less ▲]

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See detailRe-commissioning of a VAV air cistribution system.
Andre, Philippe ULg; Aparecida Silva, Cl.; Fonseca, N. et al

Conference (2004, October)

Three years after its start up, the building considered here is not yet providing a satisfactory comfort to its occupants. Too cold and too hot environmental conditions were too often encountered in ... [more ▼]

Three years after its start up, the building considered here is not yet providing a satisfactory comfort to its occupants. Too cold and too hot environmental conditions were too often encountered in different occupied zones, mainly in mid-season and in summertime. The execution of a re- commissioning process would support in resolving these problems. Previous verifications allowed us to confirm that almost all HVAC components considered are technically “correct” and that almost all problems are coming from mistakes committed when installing and tuning these components. The re-commissioning presented in this paper is based on both calculation and experimental data. [less ▲]

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See detailA functional test procedure for the improved commissioning of a VAV system
Andre, Philippe ULg; Lacôte, P.; Aparecida Silva, Cl. et al

Conference (2004, October)

In the context of the IEA40 research project, a specification of a “Functional Test Procedure” was progressively developed using the CA-MET building in Namur as real size test bench for the application ... [more ▼]

In the context of the IEA40 research project, a specification of a “Functional Test Procedure” was progressively developed using the CA-MET building in Namur as real size test bench for the application and validation of the procedure. The target system is a typical VAV system devoted to the ventilation, cooling and air conditioning functions. The procedure consists in a series of operations to be applied to the system, considered as a set of connected components and taking into account the following constraints: - time availability - intrinsic limitations of the system - reference performances The proposed procedure is divided in two sets of actions: - a number of preliminary actions allowing to take the best benefit of the subsequent phases: o identification of available measurement points o identification of actuators characteristics o identification of control strategies o aeraulic network calculations o selection of measurement techniques and experimental design - the verification tasks themselves: The philosophy of the verification process is to bring the system into a number of states whoch allowed each specific checks to be carried out. The organisation of the procedure tries to optimize the time spent for commissioning by logically sequencing the operations according to the following order: - test in manual operation - test in manual stop - test in normal operation - test at maximum flowrate - test at minimum flowrate - test in automatic stop The paper will provide the specific operations to be carried out at each step and will illustrate the whole process with the prototyping work performed on the CA-MET building in Namur. [less ▲]

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See detailCommissioning-orientated building loads calculations. Application to the CA-MET building in Namur (Belgium).
Adam, Ch.; Andre, Philippe ULg; Aparecida Silva, Cl. et al

Conference (2004, October)

The parallel use of whole building simulation and monitoring of building energy consumptions (heating, cooling, lighting and other electricity consumptions) represents a potential “high-level” ... [more ▼]

The parallel use of whole building simulation and monitoring of building energy consumptions (heating, cooling, lighting and other electricity consumptions) represents a potential “high-level” commissioning tool in order to verify, either as a one shot campaign or as a continuous process, the correct operation of a building. The most advanced approaches use on-line building simulation to continuously compare the real performance of the building to a base line provided by simulation. In that context, different levels of building loads calculation can be used, ranging from rough methods like eg degree day methods to detailed multizone building simulation. The former methods use aggregated information about the buildings (“global” parameters like the heat loss coefficient for instance) and provide as outputs average quantities (energy consumption for a given average controlled temperature) while the latter require a high number of parameters and deliver very detailed results (hourly evolution of demands in each zone of the building). A major question concerns the suitability of the different approaches in a commissioning context. This papers illustrates the use of different calculation methods (heating and cooling loads) for the particular case of an office building located in Namur (Belgium), which is the object of an intensive re-commissioning activity for several years. Very global methods are used as well as detailed computer simulations using TRNSYS Multizone building types 46 and 56. In the latter case, the model is calibrated using reference periods and can serve as a baseline indicator of the energy consumption in the building. The complexity of the building (300 m long, modular architecture, presence of an atrium-like internal street) required some simplifications in the modelling associated to a specific methodology to extrapolate the results got from the simulation of a relatively small part of the building to the whole picture. The paper will explain the advantages and disadvantages of each approach, the required information and the limits of the results. The potential use of the different calculation levels for the implementation in a continuous commissioning process will be examinated as conclusion of the work. [less ▲]

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See detailRe-commissioning of the CA-MET HVAC system : a successful case study ?
Andre, Philippe ULg; Cuevas, Ch.; Lacôte, P. et al

Conference (2003, October)

Commissioning is a unique opportunity, for all partners concerned, to learn a lot about the real behavior of a HVAC system. It has to start from comfort and health requirements in occupancy zones, and ... [more ▼]

Commissioning is a unique opportunity, for all partners concerned, to learn a lot about the real behavior of a HVAC system. It has to start from comfort and health requirements in occupancy zones, and going back to the plant through the whole air conditioning system. Focus is given here to the so-called “re-commissioning” and the proposed principles are illustrated by reference to a specific case study: the “CAMET” building. The "CA-MET" is a new ministry office building, designed for an occupancy of about 1000 people and located in the city of Namur, in Belgium. The building is cooled, thanks to a VAV/CAV system. Heating is provided independently by a classical hydronic radiator system. By lack of time, here as usually, the HVAC initial commissioning was done in a hurry… And, as soon as starting his job, the manager received a fair amount of complaints from the building occupants. The building was selected as a "good" case study to illustrate the work developed in the frame of the IEA-ECBCS "annex 40" project… This paper is presenting the methodology used in the first re-commissioning phase, some examples of results and also some general recommendations. [less ▲]

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See detailUse of simulation in the commissioning of an office building
Andre, Philippe ULg; Lacôte, P.; Adam, Ch. et al

in Proceedings of SSB'2002 congress (2002, December)

In the frame of two successive IEA-ECBCS annexes, the « CA-MET » building in Namur was the object of commissioning and re-commissioning activities. First, during the construction of the building and ... [more ▼]

In the frame of two successive IEA-ECBCS annexes, the « CA-MET » building in Namur was the object of commissioning and re-commissioning activities. First, during the construction of the building and installation of the HVAC plant, a systematic survey of the work was carried out in the frame of IEA Annex 34 (“Fault Detection”). Therefore, attention was paid to a specific part of the plant (a typical Air handling Unit) and a number of testing and verifications were performed, as a complement to the normal and ongoing commissioning activities: - testing and balancing of air and water networks - air flowrate measurements - water flowrate measurements - control system analysis The most important faults identified in this part of the project were classified according to the IEA 34 template and, for each of these faults, the possibility of developing an automatic fault detection method was analysed. The paper will report on the most relevant problems and present the automatic fault detection method proposed. In a second step, which occurred during in the early stages of the operational phase of the building, a further verification of specific subsystems was carried out, as part of a re-commissioning activity. This work is being realized in the frame of IEA Annex 40 and ends up with a proposal of systematic verification procedure to be applied, as a first example, to a VAV system. This procedure follows a hierarchical approach (bottom-up), starting with the local VAV loop, going through the AHU and ending with the chilled water production equipment. The paper reports on the application of the procedure to the selected building and will be based upon experimental results obtained during target monitoring campaigns. [less ▲]

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See detailRe-commissioning of an air handling unit
Cuevas, C.; Lebrun, Jean ULg; Lacôte, P. et al

in Proceedings ABT'2002 Congress (2002, November)

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See detailBringing simulation to application. Some guidelines and practical recommandations issued from IEA-BCS Annex 30
Andre, Philippe ULg; Lebrun, Jean ULg; Ternoveanu, A.

in Proceedings "Building simulation 99" (1999, September)

Simulation tools are not yet used as much and as well as they should all along building life cycle ( BLC ). Most important decisions are still taken almost without using these tools. The work done in the ... [more ▼]

Simulation tools are not yet used as much and as well as they should all along building life cycle ( BLC ). Most important decisions are still taken almost without using these tools. The work done in the frame of IEABCS Annex 30 consisted in identifying and eliminating as much as possible the main bottle necks encountered in the use of simulation tools. [less ▲]

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See detailIEA Annex 30 : bringing simulation to application. Conclusions of subtask 1 : model qualification
Andre, Philippe ULg; Bourdouxhe, J.-P.; Lebrun, Jean ULg

in Proceedings of SSB'98 (1998, December)

From 1995 to 1998, IEA Annex 30 "Bringing Simulation to Application" has been adressing the problem of improving the conditions aiming at a more effective use of building and HVAC simulation among ... [more ▼]

From 1995 to 1998, IEA Annex 30 "Bringing Simulation to Application" has been adressing the problem of improving the conditions aiming at a more effective use of building and HVAC simulation among consulting engineers and building practitioners. Therefore, the project gathered both academic research teams and several consulting offices representatives in order to demonstrate, on real Case Studies, what should be done to achieve this goal. The first Subtask of the IEA Annex 30 was dealing with the most fundamental step appearing in the process of simulation use: qualification of the models implemented in the available simulation tools. The objective of the Subtask was to establish a framework allowing any simulation models developper to provide the necessary information making any simulation model user more confident when using such tools. To achieve this objective, Subtask 1 was divided in two parts: - a first part dealing with a survey of the available models and data resources useful for building and HVAC simulation; - a second part dealing with the development and the application on several examples of "model qualification procedures", which provides the required framework. The survey action was mainly focussing on the following items: models, meteorological data, internal gains, HVAC and material databases. The model qualification procedure was first defined as a sequence of operations involving several steps: model documentation, parameters identification, examples of use and sample results, validation (or verification of the models), integration in a data exchange process. This procedure was applied to several building and HVAC models: building thermal zones, cooling coil, chiller and cooling tower. [less ▲]

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See detailIEA Annex 30: Bringing Simulation to Application. Final report
Lebrun, Jean ULg; Andre, Philippe ULg

Report (1998)

Rapport final du projet IEA Annex 30, Bringing Simulation to Application, qui s'est déroule entre 1995 et 1998

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See detailIEA Annex 30 : "Bringing simulation to application". Presentation of Subtask 1 : "Model qualification"
Andre, Philippe ULg; Bourdouxhe, J.-P.; Lebrun, Jean ULg

in Proceedings Clima 2000 (1997)

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