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Experimental evaluation and performance enhancement prediction of desiccant assisted separate sensible and latent cooling air-conditioning system / Jiazhen Ling 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. 946-957 Titre : Experimental evaluation and performance enhancement prediction of desiccant assisted separate sensible and latent cooling air-conditioning system Titre original : Evaluation expérimentale et prévision de l'amélioration de la performance d'un système de conditionnement d'air à chaleur sensible et latente assisté d'un déshydratant séparé Type de document : texte imprimé Auteurs : Jiazhen Ling, Auteur ; Osamu Kuwabara, Auteur ; Yunho Hwang, Auteur Année de publication : 2011 Article en page(s) : pp. 946-957 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : CO2  Cooling  Desiccant  Heat  exchanger  Latent  heat  R410A  Sensible  heat Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : CO2 and R410A desiccant wheel (DW)-assisted separate sensible and latent cooling (SSLC) air-conditioning systems were tested under the AHRI standard. At a 50 °C regeneration temperature, the coefficient of performance (COP) of the vapor compression cycles improved only 7% from the respective baseline systems for both refrigerants. This paper proposed the idea of applying divided condensers (or gas coolers) to the R410A (or CO2) SSLC system to enhance its performance. It was found that the application of divided heat exchangers to the SSLC system provided sufficiently hot airflow for regenerating the desiccant wheel at both a reduced high side pressure (from 10.4 MPa to 9.7 MPa for CO2, from 3.46 MPa to 3.45 MPa for R410A) and a reduced discharge temperature from the condenser (gas cooler) (4 K lower for both refrigerants). The COP improvement is 36% and 61% to R410A and CO2 baseline systems, respectively. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002835 [article] Experimental evaluation and performance enhancement prediction of desiccant assisted separate sensible and latent cooling air-conditioning system = Evaluation expérimentale et prévision de l'amélioration de la performance d'un système de conditionnement d'air à chaleur sensible et latente assisté d'un déshydratant séparé [texte imprimé] / Jiazhen Ling, Auteur ; Osamu Kuwabara, Auteur ; Yunho Hwang, Auteur . - 2011 . - pp. 946-957. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 4 (Juin 2011) . - pp. 946-957 Mots-clés : CO2  Cooling  Desiccant  Heat  exchanger  Latent  heat  R410A  Sensible  heat Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : CO2 and R410A desiccant wheel (DW)-assisted separate sensible and latent cooling (SSLC) air-conditioning systems were tested under the AHRI standard. At a 50 °C regeneration temperature, the coefficient of performance (COP) of the vapor compression cycles improved only 7% from the respective baseline systems for both refrigerants. This paper proposed the idea of applying divided condensers (or gas coolers) to the R410A (or CO2) SSLC system to enhance its performance. It was found that the application of divided heat exchangers to the SSLC system provided sufficiently hot airflow for regenerating the desiccant wheel at both a reduced high side pressure (from 10.4 MPa to 9.7 MPa for CO2, from 3.46 MPa to 3.45 MPa for R410A) and a reduced discharge temperature from the condenser (gas cooler) (4 K lower for both refrigerants). The COP improvement is 36% and 61% to R410A and CO2 baseline systems, respectively. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002835

Theoretical study on separate sensible and latent cooling air-conditioning system / Jiazhen Ling 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. 510-520 Titre : Theoretical study on separate sensible and latent cooling air-conditioning system Titre original : Etude théorique d'un système de conditionnement d'air fondé sur le refroidissement sensible et latent Type de document : texte imprimé Auteurs : Jiazhen Ling, Auteur ; Yunho Hwang, Auteur ; Reinhard Radermacher, Auteur Année de publication : 2010 Article en page(s) : pp. 510-520 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Air  conditioning  Design  Process  Chilling  Air  Heat  exchange  Separation  Sensible  heat  Latent  heat  Vapour  Compression Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The advantage of separating sensible and latent cooling (SSLC) via the use of separate cycles is saving energy by raising the evaporating temperature of the sensible cooling process. In this study, the pertinent characteristics of the SSLC system using two parallel vapor compression cycles were investigated. The requirement for high air flow rate through the sensible evaporator was the most important hardware design issue, since it might lead to a high air-side pressure drop. To address this issue, a new air distribution method, which could significantly reduce the pressure drop, was proposed to replace the conventional one. The heat exchanger modeling results demonstrated that sensible evaporators of the SSLC system could provide the equivalent cooling capacity at reduced air-side pressure drop to that of the conventional system without increasing the total heat transfer area. Although initial investment of the SSLC system is projected to be higher than the conventional system, the estimated operating cost of the SSLC system is lower than the conventional one because of the low energy consumption. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700709002758 [article] Theoretical study on separate sensible and latent cooling air-conditioning system = Etude théorique d'un système de conditionnement d'air fondé sur le refroidissement sensible et latent [texte imprimé] / Jiazhen Ling, Auteur ; Yunho Hwang, Auteur ; Reinhard Radermacher, Auteur . - 2010 . - pp. 510-520. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 3 (Mai 2010) . - pp. 510-520 Mots-clés : Air  conditioning  Design  Process  Chilling  Air  Heat  exchange  Separation  Sensible  heat  Latent  heat  Vapour  Compression Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The advantage of separating sensible and latent cooling (SSLC) via the use of separate cycles is saving energy by raising the evaporating temperature of the sensible cooling process. In this study, the pertinent characteristics of the SSLC system using two parallel vapor compression cycles were investigated. The requirement for high air flow rate through the sensible evaporator was the most important hardware design issue, since it might lead to a high air-side pressure drop. To address this issue, a new air distribution method, which could significantly reduce the pressure drop, was proposed to replace the conventional one. The heat exchanger modeling results demonstrated that sensible evaporators of the SSLC system could provide the equivalent cooling capacity at reduced air-side pressure drop to that of the conventional system without increasing the total heat transfer area. Although initial investment of the SSLC system is projected to be higher than the conventional system, the estimated operating cost of the SSLC system is lower than the conventional one because of the low energy consumption. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700709002758