References of "Kummert, Michaël"
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See detailComparing vertical ground heat exchanger models
Bertagnolio, Stéphane ULg; Bernier, Michel; Kummert, Michaël

in Journal of Building Performance Simulation [=JBPS] (2012)

The main objective of this article is to establish a set of test cases for analytical verification and inter-model comparison of vertical ground heat exchanger (GHX) models used in building simulation ... [more ▼]

The main objective of this article is to establish a set of test cases for analytical verification and inter-model comparison of vertical ground heat exchanger (GHX) models used in building simulation programs. Several test cases are suggested. They range from steady-state heat rejection in a single borehole to varying hourly loads with relatively large yearly thermal imbalance in multiple borehole configurations. The usefulness of the proposed test cases is illustrated with different GHX models. This comparison exercise has shown that analytical one-dimensional (1D) models compare favourably well with three-dimensional (3D) models for relatively short-simulation periods, where axial effects are not significant. Cyclic heat rejection/collection tests proved to be useful to characterize the accuracy and the computational performance of different load aggregation algorithms. Finally, different spatial superposition methods have been compared for various bore field sizes and configurations and various loads. [less ▲]

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See detailDevelopment and application of test cases for comparing vertical ground heat exchangers models
Bernier, Michel; Kummert, Michael; Bertagnolio, Stéphane ULg

in Proceedings of the 10th International IBPSA Conference, Beijing, China (2007, September)

The main objective of this paper is to establish a set of test cases for analytical verifications and intermodel comparisons of ground heat exchanger (GHX) models used in building simulation programs ... [more ▼]

The main objective of this paper is to establish a set of test cases for analytical verifications and intermodel comparisons of ground heat exchanger (GHX) models used in building simulation programs. Several test cases are suggested. They range from steady-state heat rejection in a single borehole to varying hourly loads with large yearly thermal imbalance in multiple borehole configurations. The usefulness of the proposed test cases is illustrated by running them with different GHX models. This comparison exercise has shown that 1-D models compare favourably well with the more elaborate 3-D models for relatively small simulation periods. The cyclic heat rejection/collection test has revealed some small deficiency in the load aggregation scheme of a particular model. Finally, the use of the asymmetric (cooling dominated) load profile test case for a bore field composed of 100 boreholes revealed that the borehole wall temperature predicted by two GHX models can differ by as much as 10oC after a 30 year simulation. [less ▲]

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See detailOptimal heating control in a passive solar commercial building.
Kummert, Michaël; Andre, Philippe ULg; Nicolas, Jacques ULg

in Solar Energy (2001), 69(6), 103-116

A smart heating controller has a twofold objective: to save as much energy as possible while maintaining an acceptable comfort level in the building. Due to very large time constants in the building ... [more ▼]

A smart heating controller has a twofold objective: to save as much energy as possible while maintaining an acceptable comfort level in the building. Due to very large time constants in the building response, it has to anticipate internal and external disturbances. In the case of a passive solar commercial building, the need for anticipation is reinforced by important solar and internal gains. Indeed, large solar gains increase the energy savings potential but also the overheating risk. Optimal control theory presents an ideal formalism to solve this problem: its principle is to anticipate the building behaviour using a model and a forecasting of the disturbances in order to compute the control sequence that minimises a given cost function over the optimisation horizon. This cost function can combine comfort level and energy consumption. This paper presents the application of optimal control to auxiliary heating of a passive solar commercial building. Simulation-based and experimental results show that it can lead to significant energy savings while maintaining or improving the comfort level in this type of building [less ▲]

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See detailDevelopment and test of modern control techniques applied to solar buildings”
Kummert, Michaël; Andre, Philippe ULg

Report (1999)

Contribution au rapport final du projet européen "Development and test of modern control techniques applied to solar buildings”. Chapitre 5 sur le contrôle prédictif

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See detailBuilding and HVAC optimal control simulation. Application to an office building.
Kummert, Michaël; Andre, Philippe ULg; Nicolas, Jacques ULg

in Proceedings of the Third International symposium on HVAC (1999)

This paper describes the methodology to apply discrete-time optimal control to a building and its HVAC installation. Simulation-based results concerning a passive solar commercial building are presented ... [more ▼]

This paper describes the methodology to apply discrete-time optimal control to a building and its HVAC installation. Simulation-based results concerning a passive solar commercial building are presented and discussed. The simulation environment includes the TRNSYS TYPE 56 as reference building model and HVAC detailed models to test the controller with realistic control signals. The optimal controller's sensitivity to meteorological forecasting quality and to other factors is analysed. Its performance is compared to results obtained with a conventional control system to assess the relevancy of optimal control for this application. [less ▲]

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