Performances saisonnières des groupes de production d'eau glaçée

Philippe Rivière 1
1 CEP/Paris
CEP - Centre Énergétique et Procédés
Abstract : In Europe, the energy efficiency of chillers is rated at full load for standard conditions of operation. In order to develop a European performance index that integrates the variation of operating conditions, the part load performances of chillers must be known, as well as the conditions for which chillers operate during a season. Different chillers have been tested in stationary conditions. It appears that the nowadays lack of characterization of chillers performances at reduced capacity leads to manufacturing mistakes that decrease the energy efficiency of chillers. Performances of chillers at reduced temperature and reduced capacity are modelled for the chillers that have been tested. A test loop to rate the chillers performances in dynamic conditions has been built. This loop enables to study chillers performances when cycling (on-off mode). It appears that the major efficiency loss linked to this functioning mode comes from the parasitic sleep power electric consumption. Moreover, the facility has been used also for capacity staged chillers. Control faults have been identified that also contribute to decrease the chillers performances. By coupling to the models of chillers developed, hourly load curves of dynamic building and air conditioning system simulations for an office building, seasonal performances are calculated for various climates and systems. The results emphasizes that nominal rating performance should not be used as an efficiency indicator for chillers. A method of reduction of the hourly load curves has been developed. It enables to define a seasonal performance index for European chillers.
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Philippe Rivière. Performances saisonnières des groupes de production d'eau glaçée. Mécanique des fluides [physics.class-ph]. École Nationale Supérieure des Mines de Paris, 2004. Français. ⟨NNT : 2004ENMP1224⟩. ⟨pastel-00001483⟩

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