Center Technique des Industries Aerauliques et Thermiques

Villeurbanne, France

Center Technique des Industries Aerauliques et Thermiques

Villeurbanne, France
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Leoni A.,INSA Lyon | Leoni A.,Center Technique des Industries Aerauliques et Thermiques | Mondot M.,Center Technique des Industries Aerauliques et Thermiques | Durier F.,Center Technique des Industries Aerauliques et Thermiques | And 2 more authors.
Refrigeration Science and Technology | Year: 2015

This paper presents a comparative study of predictive methods of frost growth on flat surfaces. The study focuses on the comparison between 4 different existing theoretical models or empirical correlations and a database gathering almost 556 test points available in the literature. Impacts of air velocity, relative humidity and wall temperature are studied. The latter is found to have a significant impact on frost development. Quantitative and qualitative analysis of the predictive methods are proposed. This study leads to the identification of the main issues in the field of modelling of frost deposition on flat plates.


Leoni A.,University Claude Bernard Lyon 1 | Mondot M.,Center Technique des Industries Aerauliques et Thermiques | Durier F.,Center Technique des Industries Aerauliques et Thermiques | Revellin R.,University Claude Bernard Lyon 1 | Haberschill P.,University Claude Bernard Lyon 1
Experimental Thermal and Fluid Science | Year: 2017

This paper proposes new experimental data on frost formation and development on flat plate. The experimental data have been obtained on a 300×300mm2 aluminum plate, with humid air flowing inside a closed-loop wind-tunnel. The effect of environmental conditions has been studied with a sensitivity analysis. Air velocity ranges between 1 and 4 m.s-1, air temperature between 5 and 16 °C, air relative humidity between 50% and 80% and plate temperature between −25 and 0 °C. First, the Lewis analogy boundary layer frequently used to simplify frost phenomenon formulation is checked successfully. Results provided by the sensitivity analysis showed that plate temperature and air relative humidity are the most influential parameters on frost properties (thickness, density and thermal conductivity). Tortuosity, depending on the frost crystal shapes, is also identified as a key parameter which needs deeper investigations. A comparison of experimental data with models from the literature is proposed. Predictive methods have been tested. Reliable predictive methods have been identified for frost thickness and frost conductivity. Correlations for predicting frost density need to be improved. This work also highlights the important role of crystal shape in frost deposition mechanisms. © 2017 Elsevier Inc.


Grant
Agency: European Commission | Branch: H2020 | Program: MSCA-ITN-ETN | Phase: MSCA-ITN-2016 | Award Amount: 3.84M | Year: 2017

A step change in our noise mitigation strategies is required in order to meet the environmental targets set for a number of sectors of activity affecting people through noise exposure. Besides being a hindrance to our daily life and subject to regulations, noise emission is also a competitive issue in todays global market. To address these issues, new technologies have been emerging recently, based on radically new concepts for flow and acoustic control, such as micro-electro-mechanical devices (MEMs), meta-materials, porous treatment of airframe surfaces, airfoil leading-edge or trailing-edge serrations, micro-jets, plasma actuation, Some of these new ideas appear nowadays promising, but it now appears to this consortium that the development and maturation of novel noise reduction technologies is hindered by three main factors. The first factor is an insufficient understanding of the physical mechanisms responsible for the alteration of the flow or acoustic fields. In absence of a phenomenological understanding, modelling and optimization can hardly be successful. Secondly, tight constraints (safety, robustness, weight, maintainability, etc.) are imposed to any novel noise mitigation strategy trying to make its way to the full-scale industrial application. Thirdly, there is an insufficient knowledge about the possibilities that are nowadays offered by new materials and new manufacturing processes. With this project, we intend to setup a research and training platform, focused on innovative flow and noise control approaches, addressing the above shortcomings. It has the following objectives: i) fostering a training-through-research network of young researchers, who will investigate promising emerging technologies and will be trained with the inter-disciplinary skills required in an innovation process, and ii) bringing in a coordinated research environment industrial stakeholders from the aeronautical, automotive, wind turbine and cooling/ventilation sectors.


David C.,Center Technique des Industries Aerauliques et Thermiques | Melvad C.,Danish Technological Institute DTI | Bissig H.,Federal Institute of Metrology | Batista E.,IPQ Instituto Portugues da Qualidade
16th International Flow Measurement Conference 2013, FLOMEKO 2013 | Year: 2013

This paper presents the results obtained in a research inter-comparison organized in the framework of the development of traceable micro flow facilities for liquids within the EMRP project "HLT07 Metrology for Drug Delivery" [1]. The paper presents the protocol of the comparison and the first results revealing some discrepancies between the laboratories. Copyright© (2013) by the International Measurement Federation (IMEKO).


Tatsidjodoung P.,CNRS Laboratory of Design Optimisation and Environmental Engineering | Tatsidjodoung P.,DeVry University | Le Pierres N.,CNRS Laboratory of Design Optimisation and Environmental Engineering | Heintz J.,Center Technique des Industries Aerauliques et Thermiques | And 3 more authors.
Energy Conversion and Management | Year: 2016

This paper addresses the thermal performances of a zeolite-based open sorption heat storage system to provide thermal energy for space heating needs. The study focuses on the experimentation of a significant scale prototype using zeolite 13X/H2O as the reactive pair, and on the development of a 1D mathematical model used to predict both the charging (desorption) and the discharging (adsorption) processes occurring inside the storage unit. The experimental campaigns and the numerical results lead to some promising conclusions on the thermal performances of such a storage unit. With 40 kg of zeolite, a temperature lift of 38 °C on average at the outlet of each zeolite's vessel during 8 h was achieved during the discharging with an airflow inlet at 20 °C, 10 g/kg of dry air of specific humidity and a flow rate of 180 m3/h. Some discrepancies between the experimental and simulation results were observed during both the charging and discharging tests, and were explained. © 2015 Elsevier Ltd.


Leoni A.,INSA Lyon | Leoni A.,Center Technique des Industries Aerauliques et Thermiques | Mondot M.,Center Technique des Industries Aerauliques et Thermiques | Durier F.,Center Technique des Industries Aerauliques et Thermiques | And 2 more authors.
International Journal of Refrigeration | Year: 2016

This paper presents a comparative study of predictive methods of frost growth and densification on horizontal, vertical and parallel flat surfaces. The study treats two aspects of frost formation: thickness and density. It focuses on the comparison between four different existing theoretical models or empirical correlations and a database gathering almost 382 test points available in the literature for average frost thickness. Furthermore, five correlations are compared to 149 data points for average frost density. Impacts of air velocity, relative humidity and wall temperature are studied. The latter is found to have a significant impact on frost development. Quantitative and qualitative analyses of the predictive methods are proposed. This study leads to the identification of the main issues in the field of modelling of frost deposition on horizontal, vertical and parallel flat plates. © 2016 Elsevier Ltd and IIR. All rights reserved.


David C.,Center Technique des Industries Aerauliques et Thermiques | Claudel P.,Center Technique des Industries Aerauliques et Thermiques
Mapan - Journal of Metrology Society of India | Year: 2011

In order to extend the French water flow calibration range, LNE-CETIAT is on progress to build a new reference for flow rate measurements ranging from 10 000 ml. h-1 down to 1 ml. h-1. This new facility based on a gravimetric principle will enable calibration with water temperature between 10 °C and 50 °C. Flow is regulated by the combined use of a tightly regulated "upstream" pressure (0,1 to 10 bar) and the use of capillaries under laminar flow. The expected relative uncertainty for the water flow rate is 0.1 % with a coverage factor k = 2 (95% confidence). The paper described the design and the ongoing implementation of this new calibration facility. © 2011 Metrology Society of India.


David C.,Center Technique des Industries Aerauliques et Thermiques | Claudel P.,Center Technique des Industries Aerauliques et Thermiques
15th International Flow Measurement Conference 2010, FLOMEKO 2010 | Year: 2010

In order to extend the French water flow calibration range, LNE-CETIAT is on progress to build a new reference for flow rate measurements ranging from 10 l.h-1 down to 1 ml.h-1. This new facility based on a gravimetric principle (ISO 4185) will enable calibration with water temperature between 10°C and 50°C. Flow is regulated by the combined use of a tightly regulated "upstream" pressure (0,1 to 10 bar) and the use of capillaries under laminar flow. The expected relative uncertainty for the water flow rate is 0.1% with a coverage factor k = 2 (95% confidence). The paper described the design and the ongoing implementation of this new calibration facility. Copyright © FLOMEKO 2010.


Favreau J.,Center Technique des Industries Aerauliques et Thermiques | Georgin E.,Center Technique des Industries Aerauliques et Thermiques | Savanier B.,Center Technique des Industries Aerauliques et Thermiques
17th International Congress of Metrology, CIM 2015 | Year: 2015

This paper presents physical principles involved and main errors encountered when performing surface temperature measurements, in contact thermometry. Two concepts are defined: direct temperature measurements where the objective is to evaluate the surface temperature that prevailed prior to the application of the sensor and indirect measurements using surface sensors to assess, for example, the internal temperature of a fluid flowing in a pipe or within a wall. It is important to define the quantity of interest, i.e. the measurand, because the same sensor can be used but implemented differently. For example, for direct measurement, sensors can be calibrated on surface temperature calibrator and should be applied directly on the surface that should be measured. Whereas, for indirect measurements, improving the thermal contact can be achieved by using a thermal dough or sensor insulation and calibration should be realized on site. To illustrate these situations and these phenomena, various measurements of industrial surface temperature are provided. For example, it is important, in an industrial mixing process, to control the mixer surface temperature to ensure the quality of the finished mixed product. The temperature of the machine housings has also to be controlled to prevent the risk of burns. Energy audits can also be based on such measures. Surface temperature sensors are more and more present in the controls of heating and air-conditioning systems such as heat pumps, boilers. Surface temperature often help saving time during manufacturing and during maintenance operations. Over the past decade, the performances of such sensors has been much improved. This article outlines the precautions and best practices for implementation of the contact temperature sensors. The environmental effects are studied in order to quantify the impact on the measurements. The concepts developed by Bardon, Cassagne and Sacadura are used to explain the effects present at the interface. The effects of an air flow, the radiation, thermal conductivity of the wall, the fixing system of the sensor are studied for an optimal implementation of relevant solutions. The paper offers an overview of current implementations techniques and possible performance levels. © 2015 Owned by the authors, published by EDP Sciences.


Ginestet A.,Center Technique des Industries Aerauliques et Thermiques | Pugnet D.,Center Technique des Industries Aerauliques et Thermiques | Mouradian L.,Center Technique des Industries Aerauliques et Thermiques
Indoor Air 2014 - 13th International Conference on Indoor Air Quality and Climate | Year: 2014

The objective of our study (3 years) was to determine the performances of commercially available panel mini-pleated filters (G4, M5 and F7) for balanced ventilation systems for dwellings as they are continuously used for long-term (1 year) with real outdoor air. Fractional efficiency (0.2 to 5 μm), pressure drop and dust holding capacity of the filters have been measured as function of time. Results show that all the filters are not equal and that the efficiency of the electret filters decreases as function of time while that of the mechanical effects only filters increases. The influence of the use of a G4 prefilter installed upstream of F7 filters as well as the influence of the pleat width have been shown on the pressure drop of the filters and on the energy consumption of a balanced ventilation system. A new way for testing and classification is proposed for such filters.

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