Documents disponibles écrits par cet auteur

Experimental study on a combined double-way chemisorption refrigeration system / L. Xu 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. 914-921 Titre : Experimental study on a combined double-way chemisorption refrigeration system Titre original : Etude expérimentale sur un système frigorifique à sorption chimique utilisant deux lits adsorbants Type de document : texte imprimé Auteurs : L. Xu, Auteur ; R.Z. Wang, Auteur ; T.X. Li, Auteur Année de publication : 2011 Article en page(s) : pp. 914-921 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Sorption  Refrigeration  COP  Adsorption  Resorption Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A combined double-way chemisorption refrigeration system was described and investigated, and the experimental test unit was built, which consists of two adsorption beds: one high-temperature salt bed (HTS bed), which is filled with manganese chloride; and one low-temperature salt bed (LTS bed), which is filled with barium chloride. Moreover, the working performance of double-way chemisorption refrigeration cycle was studied. This cycle uses only one heat input to get two cold outputs, one of which comes from the evaporation heat produced by the refrigerant during the adsorption process, and another of which is from decomposition reaction heat consumed by LTS during the resorption process. The experimental results showed that the coefficient of performance (COP) and specific cooling power (SCP) were 0.703 and 225 W kg−1 respectively at the refrigeration temperature of 15 °C, regeneration temperature of 160 °C and heat sink temperature of 30 °C. Also, the relation between the average global conversion and the COP value were found and analyzed. And the choice of salts and optimum reaction time were discussed either. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711000673 [article] Experimental study on a combined double-way chemisorption refrigeration system = Etude expérimentale sur un système frigorifique à sorption chimique utilisant deux lits adsorbants [texte imprimé] / L. Xu, Auteur ; R.Z. Wang, Auteur ; T.X. Li, Auteur . - 2011 . - pp. 914-921. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 4 (Juin 2011) . - pp. 914-921 Mots-clés : Sorption  Refrigeration  COP  Adsorption  Resorption Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A combined double-way chemisorption refrigeration system was described and investigated, and the experimental test unit was built, which consists of two adsorption beds: one high-temperature salt bed (HTS bed), which is filled with manganese chloride; and one low-temperature salt bed (LTS bed), which is filled with barium chloride. Moreover, the working performance of double-way chemisorption refrigeration cycle was studied. This cycle uses only one heat input to get two cold outputs, one of which comes from the evaporation heat produced by the refrigerant during the adsorption process, and another of which is from decomposition reaction heat consumed by LTS during the resorption process. The experimental results showed that the coefficient of performance (COP) and specific cooling power (SCP) were 0.703 and 225 W kg−1 respectively at the refrigeration temperature of 15 °C, regeneration temperature of 160 °C and heat sink temperature of 30 °C. Also, the relation between the average global conversion and the COP value were found and analyzed. And the choice of salts and optimum reaction time were discussed either. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711000673

Vibration performance of lightweight cold-formed steel floors / R. Parnell in Journal of structural engineering, Vol. 136 N° 6 (Juin 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 6 (Juin 2010) . - pp. 645-653 Titre : Vibration performance of lightweight cold-formed steel floors Type de document : texte imprimé Auteurs : R. Parnell, Auteur ; B. W. Davis, Auteur ; L. Xu, Auteur Année de publication : 2011 Article en page(s) : pp. 645-653 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Floor  vibration  Floor  vibration  performance  Lightweight  floor  Cold-formed  steel  C-shaped  joist  Natural  frequency  Damping  ratio Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A study investigating the modal properties and dynamic response of several laboratory-constructed and in situ floors supported with cold-formed steel C-shaped joists for floors was conducted. The tested floors were typical of residential midrise applications, with oriented-strand board, FORTACRETE, and cold-formed steel deck subfloors, both with and without lightweight concrete topping. Details including span, large lip-reinforced web openings, subfloor, topping, strongback, and framing condition were varied to observe their influence on the fundamental frequency, damping ratio, and deflection. Suggestions for the design and remediation of floors where vibration serviceability is a concern are given. Laboratory tested floor systems were generally found to be the worst-case scenario for the natural frequency and damping ratio. Furniture and finishes were found to not appreciably change the performance of a floor system. The responses of the floor systems tested in this study were evaluated against the ISO 2631 limit for maximum acceleration and Onysko’s static deflection limit, as presented in ATC Design Guide 1: Minimizing Floor Vibration. The in situ floors examined were found to have performed within the acceptable range, as defined by the two criteria. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i6/p645_s1?isAuthorized=no [article] Vibration performance of lightweight cold-formed steel floors [texte imprimé] / R. Parnell, Auteur ; B. W. Davis, Auteur ; L. Xu, Auteur . - 2011 . - pp. 645-653. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 6 (Juin 2010) . - pp. 645-653 Mots-clés : Floor  vibration  Floor  vibration  performance  Lightweight  floor  Cold-formed  steel  C-shaped  joist  Natural  frequency  Damping  ratio Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A study investigating the modal properties and dynamic response of several laboratory-constructed and in situ floors supported with cold-formed steel C-shaped joists for floors was conducted. The tested floors were typical of residential midrise applications, with oriented-strand board, FORTACRETE, and cold-formed steel deck subfloors, both with and without lightweight concrete topping. Details including span, large lip-reinforced web openings, subfloor, topping, strongback, and framing condition were varied to observe their influence on the fundamental frequency, damping ratio, and deflection. Suggestions for the design and remediation of floors where vibration serviceability is a concern are given. Laboratory tested floor systems were generally found to be the worst-case scenario for the natural frequency and damping ratio. Furniture and finishes were found to not appreciably change the performance of a floor system. The responses of the floor systems tested in this study were evaluated against the ISO 2631 limit for maximum acceleration and Onysko’s static deflection limit, as presented in ATC Design Guide 1: Minimizing Floor Vibration. The in situ floors examined were found to have performed within the acceptable range, as defined by the two criteria. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i6/p645_s1?isAuthorized=no