Principe de la régulation automatique de la combustion : Essais effectués avec deux photodiodes dans un brûleur

Report (2005)

Influence de l'addition de dimethoxymethane (DMM) sur les émissions d'une flamme de brûleur au mazout : Partie III

Report (2004)

Etude expérimentale de l'influence de la pression d'injection du combustible sur les émissions de polluants

Report (2004)

Influence de l'addition de dimethoxymethane (DMM) sur les émissions d'une flamme de brûleur au mazout : Partie II

Report (2004)

Influence de l'addition de dimethoxyméthane (DMM) sur les émissions d'une flamme de brûleur au mazout

Report (2004)

Combustion control by means of a photodiode

in Proceedings of the 25th Task Leaders Meeting (TLM) of the IEA Implementing Agreement "Energy Conservation and Emissions Reduction in Combustion" (2003, September)

The objective of this work was to assess the feasibility of a photodiode to control combustion, instead of a spectrometer (which is an expensive sensor to be used in commercial burners). For that purpose ... [more ▼]

The objective of this work was to assess the feasibility of a photodiode to control combustion, instead of a spectrometer (which is an expensive sensor to be used in commercial burners). For that purpose, the flame emission has been measured in a hot-water boiler fired with light fuel-oil, whose nominal output power goes up to 370 kW. The parameters investigated were: overall air excess, combustion air distribution, burner power and atmospheric conditions. High influence of air distribution on the flame emission was detected by the diode, since it modifies directly the mixing quality reducing rich-fuel regions where soot can be formed. Low influence of air excess and burner power was found. When these parameters increase, the flame emission decreases. This behavior is explained by the better mixing attained at high burner power and at high air excess. However the high emission level observed at low firing rate can be reduced with a good burner adjustment. With the photodiode, it was possible to find the optimum air excess value where NO, CO and soot are as low as possible. As the photodiode measures locally in the flame, results were compared with images obtained with a CCD camera. Finally, these results are in good agreement with those obtained previously with the spectrometer. [less ▲]

Photodiodes for Combustion Control (V2)

Report (2003)

Modelling of an air condenser working in critical zone for engine cooling by refrigerant loop

in 6th Edition of Vehicle Thermal Management Systems (VTMS) Conference (2003, May)

A general and simple model of a condenser for engine cooling by refrigeration loop is presented. The model assumes that the condenser is divided into three distinct zones on the refrigerant side: the ... [more ▼]

A general and simple model of a condenser for engine cooling by refrigeration loop is presented. The model assumes that the condenser is divided into three distinct zones on the refrigerant side: the vapor superheated zone, the two-phase zone and the sub-cooled liquid zone. The model inputs are the dry bulb air supply temperature, the air mass flow rate, the refrigerant supply over-heating, the sub-cooling and the refrigerant mass flow rate. The model is able to give mainly the pressure and temperature in each zone and, of course also, the heat flow and the exhaust enthalpy. The model gives also the geometrical repartition or area percentage of each zone. Adjustable coefficients are used with each correlation to fit the experimental results. An example of identification and validation is presented. The condenser has been tested up to 40 bar with R134a and the model accuracy is within ±2K in condensing temperature prediction. [less ▲]

A Photodiode for Combustion Control (1)

Report (2003)

Etude expérimentale du refroidissement diphasique indirect d’une pile à combustible

Report (2002)