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Gosse G.,INSA Lyon | Pezerat C.,University of Maine, France | Bessac F.,CETIAT
Acta Acustica united with Acustica | Year: 2013

The prediction of the noise radiated by finned coils is necessary to design silent heat pumps. Finned coils are made of a huge number of parallel fins multi-coupled by tubes. Modelling the complete structure using Finite and Boundary Element Methods is practically impossible due to very-high computational costs. It seems thus relevant to exploit the periodicity of the structure to get a small-sized model independent of the number of fins. In this paper, the finned coil is reduced to a finite assembly of fins multi-coupled by springs. Using the transfer matrix formulation, the structure is divided into unit elements and propagating waves are identified. The main feature of the approach presented here is to use these waves to compute the acoustic response of the complete periodic structure from the acoustic response of only one unit element. For this purpose, the acoustic pressure radiated by the unit element is computed for each wave travelling in the structure using standard BEM software. The pressure fields are then duplicated according to the phase difference of each wave and all waves contributions are finally summed. A numerical comparison with the direct computation of a complete assembly with FEM and BEM showed a great accuracy with a low computational effort. This approach allows to consider finite structures made of numerous fins without a huge increase of calculation time. © S. Hirzel Verlag · EAA. Source


Aubry A.,University of Lorraine | Aubry A.,Nancy Research Center for Automatic Control | Noel J.,CETIAT | Rahon D.,French Institute of Petroleum | And 2 more authors.
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2013

This paper presents the Plate-Form(E)3 project which is funded by the French National Research Agency (ANR) as a case study highlighting cross-scale models interoperability problems. This project involves public and private French organisations. It deals with the specification of a software platform for computing and optimising the energetic and environmental efficiency for industries and territories. Its aim is the integration of specialised tools for analysing sustainability of any processes. One important topic addressed by this project concerns the interoperability issues when interconnecting these tools (for modelling, simulating, and optimising) into the platform at different modelling scales (territory/plant/process/component). This paper proposes to highlight the interoperability issues led by the heterogeneity of the related tools in the energetic and environmental efficiency context. © 2013 Springer-Verlag. Source


Ginestet A.,CETIAT
Filtration and Separation | Year: 2013

CETIAT has undertaken a long term study looking at the design, performance, and testing of air filters for balanced ventilation systems in dwellings. As a consequence of energy issues and the necessity to reduce the energy consumption of buildings, tighter control of air is now required. In this context, better control of building ventilation is needed and the market for balanced ventilation systems with heat recovery for dwellings is growing. The objective of the study was to determine the pressure drop increase of filters of balanced ventilation systems for dwellings as they are used continuously in the long-term with real outdoor air. A heat exchanger is used at the crossing of the two ductworks between outdoor air and exhaust air, allowing supplied air to be heated during the cold season and cooled during the warm season. Source


Johannes K.,University Claude Bernard Lyon 1 | Kuznik F.,INSA Lyon | Hubert J.-L.,Electricite de France | Durier F.,CETIAT | Obrecht C.,INSA Lyon
Applied Energy | Year: 2015

This paper presents the design and the characterisation of a high powered energy dense zeolite thermal heat storage system using water vapour sorbate. The specification requirements of the system are to supply a heating power of 2kW during 2h in order to shave the electricity peak loads in a house. The open reactor has been designed, built and instrumented with temperature sensors, chilled mirror hygrometer and airflow meter. Several tests have been carried out both during hydration - heat release - and dehydration - heat storage. Tests have also been carried out for different flow rates, relative humidity and temperatures of hydration. The results show that the reactor can supply a constant power of 2.25kW during more than two hours, namely 27.5Wkg-1 of material. © 2015 Elsevier Ltd. Source


Guedel A.,CETIAT | Robitu M.,CETIAT | Chaulet V.,Ziehl Abegg FMV
Journal of Engineering for Gas Turbines and Power | Year: 2013

The objective of this paper is to compare the measured and predicted performances of a tubeaxial fan for several casing configurations that are commonly proposed by fan manufacturers to their clients. This work is motivated by the European Commission Regulation 327/2011, which will impose target energy efficiency for fans driven by electric motors beginning 1 January 2013. The prediction is made with the computational fluid dynamics (CFD) commercial code STAR-CCM+. The agreement between the experimental and numerical results on fan performance curves is very satisfactory, which confirms that CFD simulations may advantageously replace testing in parametric studies since they predict the quantitative differences of aerodynamic performance observed experimentally between the different casing configurations quite well. Numerical simulations may, therefore, help manufacturers to improve the geometry of their fans in order to fulfill the requirements of the regulation. Copyright © 2013 by ASME. Source

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