Documents disponibles écrits par cet auteur

Performance analysis of desiccant dehumidification systems driven by low-grade heat source / Jongsoo Jeong 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. 928-945 Titre : Performance analysis of desiccant dehumidification systems driven by low-grade heat source Titre original : Analyse de la performance des systèmes à déshumidification à déshydratant avec une source de chaleur à basse température Type de document : texte imprimé Auteurs : Jongsoo Jeong, Auteur ; Seiichi Yamaguchi, Auteur ; Kiyoshi Saito, Auteur Année de publication : 2011 Article en page(s) : pp. 928-945 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Desiccant  wheel  Optimization  Dehumidification  Desiccant  Air  conditioning  Silica  gel Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : If a desiccant dehumidification system can be driven by a heat source whose temperature is below 50 °C, exhaust heat from devices such as fuel cells or air conditioners can be used as its heat source, thereby saving energy. Therefore, in this study, we used a previously validated simulation model to determine the minimum heat source temperature for driving a desiccant dehumidification system. We considered four desiccant dehumidification systems that can be driven by waste heat—conventional desiccant-type systems (wheel type and batch type with only desiccant), a system with a precooler, double-stage-type systems (a type with two desiccant wheels and a four-partition desiccant wheel type), and a batch-type system with an internal heat exchanger. We found that among these systems, the last system can be driven by the lowest heated air temperature—approximately 33 °C—which is considerably lower than that of the conventional system. DEWEY : 621.5 ISSN : 0410-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S014070071000229X [article] Performance analysis of desiccant dehumidification systems driven by low-grade heat source = Analyse de la performance des systèmes à déshumidification à déshydratant avec une source de chaleur à basse température [texte imprimé] / Jongsoo Jeong, Auteur ; Seiichi Yamaguchi, Auteur ; Kiyoshi Saito, Auteur . - 2011 . - pp. 928-945. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 4 (Juin 2011) . - pp. 928-945 Mots-clés : Desiccant  wheel  Optimization  Dehumidification  Desiccant  Air  conditioning  Silica  gel Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : If a desiccant dehumidification system can be driven by a heat source whose temperature is below 50 °C, exhaust heat from devices such as fuel cells or air conditioners can be used as its heat source, thereby saving energy. Therefore, in this study, we used a previously validated simulation model to determine the minimum heat source temperature for driving a desiccant dehumidification system. We considered four desiccant dehumidification systems that can be driven by waste heat—conventional desiccant-type systems (wheel type and batch type with only desiccant), a system with a precooler, double-stage-type systems (a type with two desiccant wheels and a four-partition desiccant wheel type), and a batch-type system with an internal heat exchanger. We found that among these systems, the last system can be driven by the lowest heated air temperature—approximately 33 °C—which is considerably lower than that of the conventional system. DEWEY : 621.5 ISSN : 0410-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S014070071000229X

Performance analysis of four-partition desiccant wheel and hybrid dehumidification air-conditioning system / Jongsoo Jeong in International journal of refrigeration, Vol. 33 N° 3 (Mai 2010) 

Public ISBD [article]  in International journal of refrigeration > Vol. 33 N° 3 (Mai 2010) . - pp. 496-509 Titre : Performance analysis of four-partition desiccant wheel and hybrid dehumidification air-conditioning system Titre original : Analyse de la performance d'une roue déshydratante à quatre segments et d'un système de conditionnement d'air à déshydratant hybride Type de document : texte imprimé Auteurs : Jongsoo Jeong, Auteur ; Seiichi Yamaguchi, Auteur ; Kiyoshi Saito, Auteur Année de publication : 2010 Article en page(s) : pp. 496-509 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Air  conditioning  Desiccant  system  Desiccant  wheel  Geometry  Modelling  Simulation  Performance  Silica  gel Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A desiccant dehumidification system with air can decrease energy consumption because it can be driven by low-grade waste heat below 80 °C. If this system can be driven by low-temperature heat sources whose temperature is below 50 °C, exhausted heat from fuel cells or air conditioners that exist everywhere can be used as heat sources. This could lead to considerable energy saving. This study provides a detailed evaluation of the performance of a four-partition desiccant wheel to make a low-temperature driving heat source possible and achieve considerable energy saving by the simulation and experiment. Further, the study investigates the in-depth performance of a hybrid air-conditioning system with a four-partition desiccant wheel by simulation. As a result, it was clear that there exists an optimum rotational speed to maximize the dehumidification performance and that the hybrid air-conditioning system improves COP by approximately 94% as compared to the conventional vapour compression-type refrigerator. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700709002783 [article] Performance analysis of four-partition desiccant wheel and hybrid dehumidification air-conditioning system = Analyse de la performance d'une roue déshydratante à quatre segments et d'un système de conditionnement d'air à déshydratant hybride [texte imprimé] / Jongsoo Jeong, Auteur ; Seiichi Yamaguchi, Auteur ; Kiyoshi Saito, Auteur . - 2010 . - pp. 496-509. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 3 (Mai 2010) . - pp. 496-509 Mots-clés : Air  conditioning  Desiccant  system  Desiccant  wheel  Geometry  Modelling  Simulation  Performance  Silica  gel Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A desiccant dehumidification system with air can decrease energy consumption because it can be driven by low-grade waste heat below 80 °C. If this system can be driven by low-temperature heat sources whose temperature is below 50 °C, exhausted heat from fuel cells or air conditioners that exist everywhere can be used as heat sources. This could lead to considerable energy saving. This study provides a detailed evaluation of the performance of a four-partition desiccant wheel to make a low-temperature driving heat source possible and achieve considerable energy saving by the simulation and experiment. Further, the study investigates the in-depth performance of a hybrid air-conditioning system with a four-partition desiccant wheel by simulation. As a result, it was clear that there exists an optimum rotational speed to maximize the dehumidification performance and that the hybrid air-conditioning system improves COP by approximately 94% as compared to the conventional vapour compression-type refrigerator. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700709002783

Static characteristics and efficient control of compression- and absorption-type hybrid air conditioning system / Jongsoo Jeong 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. 674-685 Titre : Static characteristics and efficient control of compression- and absorption-type hybrid air conditioning system Titre original : Caractéristiques statiques et régulation performante d'un système de conditionnement d'air hybride à compression / à absorption Type de document : texte imprimé Auteurs : Jongsoo Jeong, Auteur ; Kiyoshi Saito, Auteur ; Sunao Kawai, Auteur Année de publication : 2011 Article en page(s) : pp. 674-685 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Air  conditioning  Gas  engine  Absorption  Compression  Waste  heat Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A gas engine driven hybrid air conditioning system was constructed; it consisted of a gas engine, a single-stage compression-type refrigerator, and a single-effect absorption-type refrigerator that can be driven by shaft power and waste heat, respectively, from the gas engine. Its efficiency is greatly enhanced as compared to a conventional gas engine heat pump because it utilizes waste heat from the gas engine. This study used simulation and experiments to elucidate the static characteristics of this air conditioning system and develop a control system to drive this combined system efficiently. In the simulation results, the system COP at the design point was about 1.87 and, at 50% partial load operation, the performance increased by 14% because of the simultaneous manipulation of the input gas flow rate and hot water flow rate. The validity of the simulation was confirmed by experiments carried out using the actual constructed machine. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711000077 [article] Static characteristics and efficient control of compression- and absorption-type hybrid air conditioning system = Caractéristiques statiques et régulation performante d'un système de conditionnement d'air hybride à compression / à absorption [texte imprimé] / Jongsoo Jeong, Auteur ; Kiyoshi Saito, Auteur ; Sunao Kawai, Auteur . - 2011 . - pp. 674-685. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 3 (Mai 2011) . - pp. 674-685 Mots-clés : Air  conditioning  Gas  engine  Absorption  Compression  Waste  heat Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A gas engine driven hybrid air conditioning system was constructed; it consisted of a gas engine, a single-stage compression-type refrigerator, and a single-effect absorption-type refrigerator that can be driven by shaft power and waste heat, respectively, from the gas engine. Its efficiency is greatly enhanced as compared to a conventional gas engine heat pump because it utilizes waste heat from the gas engine. This study used simulation and experiments to elucidate the static characteristics of this air conditioning system and develop a control system to drive this combined system efficiently. In the simulation results, the system COP at the design point was about 1.87 and, at 50% partial load operation, the performance increased by 14% because of the simultaneous manipulation of the input gas flow rate and hot water flow rate. The validity of the simulation was confirmed by experiments carried out using the actual constructed machine. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711000077