Documents disponibles écrits par cet auteur

Experimental analysis and modeling of hydronic radiant ceiling panels using transient-state analysis / Néstor Fonseca 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. 958-967 Titre : Experimental analysis and modeling of hydronic radiant ceiling panels using transient-state analysis Titre original : Analyse expérimentale et modélisation des panneaux plafonniers refroidissants hydroniques à l'aide de l'analyse du régime transitoire Type de document : texte imprimé Auteurs : Néstor Fonseca, Auteur Année de publication : 2011 Article en page(s) : pp. 958-967 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Radiation  Ceiling  Heating  Cooling  Experimentation  Commissioning  Modelling Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The model developed in this investigation considers the hydronic panels as a transient-state heat exchanger connected to a detailed lumped transient model of the building. The behavior of the hydronic ceiling system and the interactions with its environment has been experimentally and numerically evaluated. This article presents the results of a study performed to develop a transient model of hydronic ceiling panels in heating or cooling modes and its environment (window, building structure, internal thermal loads and ventilation). Only the dry regime is considered in this case. Using as inputs the hydronic ceiling and room dimensions, material properties and the transient measurements of the air temperature at the adjacent zones, climatic conditions, supply air and water temperatures and mass flow rates, the model permits to estimate the water exhaust temperature, ceiling average surface temperature, resultant and dry air room temperatures, hydronic ceiling power and internal surface temperatures of the room in order to compare with measurements taken during the commissioning process. Two transient tests in heating and cooling modes are used to the experimental validation. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S014070071100020X [article] Experimental analysis and modeling of hydronic radiant ceiling panels using transient-state analysis = Analyse expérimentale et modélisation des panneaux plafonniers refroidissants hydroniques à l'aide de l'analyse du régime transitoire [texte imprimé] / Néstor Fonseca, Auteur . - 2011 . - pp. 958-967. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 4 (Juin 2011) . - pp. 958-967 Mots-clés : Radiation  Ceiling  Heating  Cooling  Experimentation  Commissioning  Modelling Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The model developed in this investigation considers the hydronic panels as a transient-state heat exchanger connected to a detailed lumped transient model of the building. The behavior of the hydronic ceiling system and the interactions with its environment has been experimentally and numerically evaluated. This article presents the results of a study performed to develop a transient model of hydronic ceiling panels in heating or cooling modes and its environment (window, building structure, internal thermal loads and ventilation). Only the dry regime is considered in this case. Using as inputs the hydronic ceiling and room dimensions, material properties and the transient measurements of the air temperature at the adjacent zones, climatic conditions, supply air and water temperatures and mass flow rates, the model permits to estimate the water exhaust temperature, ceiling average surface temperature, resultant and dry air room temperatures, hydronic ceiling power and internal surface temperatures of the room in order to compare with measurements taken during the commissioning process. Two transient tests in heating and cooling modes are used to the experimental validation. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S014070071100020X

Experimental study of thermal condition in a room with hydronic cooling radiant surfaces / Néstor Fonseca in International journal of refrigeration, Vol. 34 N° 3 (Mai 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 3 (Mai 2011) . - pp. 686-695 Titre : Experimental study of thermal condition in a room with hydronic cooling radiant surfaces Titre original : Etude expérimentale sur les conditions thermiques dans une pièce refroidie à l'aide de surfaces hydroniques rayonnantes Type de document : texte imprimé Auteurs : Néstor Fonseca, Auteur Année de publication : 2011 Article en page(s) : pp. 686-695 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Radiation  Ceiling  Heating  Cooling  Experimentation  Commissioning Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This paper presents a new approach for experimental analysis of chilled or heated ceiling systems and its environment (ventilation, windows and thermal loads distribution). The work is aimed at giving a better insight to crucial parameters as the contact thermal resistance, fin effectiveness of ceiling panels, mass flow rate, supply water temperature, thermal load distribution, fenestration and ventilation system effects on the radiant ceiling capacity and comfort conditions. The experimental methodology and its discussion are also presented. A test chamber is adapted in a way to reproduce as good as possible the characteristics of a hospital room with a cooling ceiling system. The convection and radiation heat transfer coefficients to room and losses through the ceiling void are also studied. Experimental data are used to fit the uncertain parameters mentioned and improve the capacity and performance of the ceiling system, but also to evaluate the design of this HVAC system and the applicable control strategies. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S014070071000294X [article] Experimental study of thermal condition in a room with hydronic cooling radiant surfaces = Etude expérimentale sur les conditions thermiques dans une pièce refroidie à l'aide de surfaces hydroniques rayonnantes [texte imprimé] / Néstor Fonseca, Auteur . - 2011 . - pp. 686-695. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 3 (Mai 2011) . - pp. 686-695 Mots-clés : Radiation  Ceiling  Heating  Cooling  Experimentation  Commissioning Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This paper presents a new approach for experimental analysis of chilled or heated ceiling systems and its environment (ventilation, windows and thermal loads distribution). The work is aimed at giving a better insight to crucial parameters as the contact thermal resistance, fin effectiveness of ceiling panels, mass flow rate, supply water temperature, thermal load distribution, fenestration and ventilation system effects on the radiant ceiling capacity and comfort conditions. The experimental methodology and its discussion are also presented. A test chamber is adapted in a way to reproduce as good as possible the characteristics of a hospital room with a cooling ceiling system. The convection and radiation heat transfer coefficients to room and losses through the ceiling void are also studied. Experimental data are used to fit the uncertain parameters mentioned and improve the capacity and performance of the ceiling system, but also to evaluate the design of this HVAC system and the applicable control strategies. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S014070071000294X