Documents disponibles écrits par cet auteur

On-line, auto-tuning control of Electronic Expansion Valves / Alessandro Beghi in International journal of refrigeration, Vol. 34 N° 4 (Juin 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 4 (Juin 2011) . - pp. 1151-1161 Titre : On-line, auto-tuning control of Electronic Expansion Valves Titre original : Détendeurs électroniques : régulation autonome en ligne Type de document : texte imprimé Auteurs : Alessandro Beghi, Auteur ; Luca Cecchinato, Auteur ; Mirco Rampazzo, Auteur Année de publication : 2011 Article en page(s) : pp. 1151-1161 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Automatic  control  Display  cabinet  Evaporator  Dry  expansion  Electronic  expansion  valve  Superheat  Transient  state Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : In this paper, the results of a research project aimed at deriving simple, high-performance, auto-tuning, robust control algorithms for evaporators controlled by means of EEVs (Electronic Expansion Valves) are reported. Control design is performed by resorting to a detailed virtual prototyping environment described in Beghi and Cecchinato (2009). The proposed control scheme consists of two nested loops. In the inner loop, the plant is connected in feedback to a PID controller. It is assumed that the structure of the process model is given but its parameters are unknown. The outer loop is composed of a parameter estimator and an adaptation algorithm that updates the parameters of the PID controller on the basis of the result of a system identification procedure. Performance of the proposed controller is evaluated in the virtual prototyping environment by means of simulations. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002896 [article] On-line, auto-tuning control of Electronic Expansion Valves = Détendeurs électroniques : régulation autonome en ligne [texte imprimé] / Alessandro Beghi, Auteur ; Luca Cecchinato, Auteur ; Mirco Rampazzo, Auteur . - 2011 . - pp. 1151-1161. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 4 (Juin 2011) . - pp. 1151-1161 Mots-clés : Automatic  control  Display  cabinet  Evaporator  Dry  expansion  Electronic  expansion  valve  Superheat  Transient  state Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : In this paper, the results of a research project aimed at deriving simple, high-performance, auto-tuning, robust control algorithms for evaporators controlled by means of EEVs (Electronic Expansion Valves) are reported. Control design is performed by resorting to a detailed virtual prototyping environment described in Beghi and Cecchinato (2009). The proposed control scheme consists of two nested loops. In the inner loop, the plant is connected in feedback to a PID controller. It is assumed that the structure of the process model is given but its parameters are unknown. The outer loop is composed of a parameter estimator and an adaptation algorithm that updates the parameters of the PID controller on the basis of the result of a system identification procedure. Performance of the proposed controller is evaluated in the virtual prototyping environment by means of simulations. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002896

Transcritical carbon dioxide small commercial cooling applications analysis / Luca Cecchinato in International journal of refrigeration, Vol. 34 N° 1 (Janvier 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 1 (Janvier 2011) . - pp. 50-62 Titre : Transcritical carbon dioxide small commercial cooling applications analysis Titre original : Analyse du dioxyde de carbone transcritique dans les petites applications commerciales Type de document : texte imprimé Auteurs : Luca Cecchinato, Auteur ; Marco Corradi, Auteur Année de publication : 2011 Article en page(s) : pp. 50-62 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Capillary  Carbon  dioxide  Commercial  application  High  pressure  Optimisation  Transcritical  cycle Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This paper presents a project to develop an R744 commercial single door bottle cooler that is cost competitive and matches the performance of typical cost optimised R404A and R134a systems. Compressors with different displacement and efficiency values are evaluated for refrigerating systems with fin and tube and steel wire-on-tube gas coolers. Capillary tubes are tested. A methodology to properly sizing them and to optimize the combination of capillary tube and refrigerant charge is developed. The problem of optimal cycle high pressure is addressed and Liao’s approximated solution questioned. Tests demonstrate that the CO2 energy consumption systems are higher than traditional ones especially at ambient temperatures above 25 °C. Carbon dioxide appears to be a feasible option for stand-alone refrigerating equipment in terms of total equivalent warming impact (TEWI) compared to HFC refrigerants with actual single stage R744 compressor technology, only if the refrigeration units operate at medium–low gas cooler inlet temperature. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002276 [article] Transcritical carbon dioxide small commercial cooling applications analysis = Analyse du dioxyde de carbone transcritique dans les petites applications commerciales [texte imprimé] / Luca Cecchinato, Auteur ; Marco Corradi, Auteur . - 2011 . - pp. 50-62. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 1 (Janvier 2011) . - pp. 50-62 Mots-clés : Capillary  Carbon  dioxide  Commercial  application  High  pressure  Optimisation  Transcritical  cycle Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This paper presents a project to develop an R744 commercial single door bottle cooler that is cost competitive and matches the performance of typical cost optimised R404A and R134a systems. Compressors with different displacement and efficiency values are evaluated for refrigerating systems with fin and tube and steel wire-on-tube gas coolers. Capillary tubes are tested. A methodology to properly sizing them and to optimize the combination of capillary tube and refrigerant charge is developed. The problem of optimal cycle high pressure is addressed and Liao’s approximated solution questioned. Tests demonstrate that the CO2 energy consumption systems are higher than traditional ones especially at ambient temperatures above 25 °C. Carbon dioxide appears to be a feasible option for stand-alone refrigerating equipment in terms of total equivalent warming impact (TEWI) compared to HFC refrigerants with actual single stage R744 compressor technology, only if the refrigeration units operate at medium–low gas cooler inlet temperature. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002276