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Performance characteristics of a simultaneous cooling and heating multi-heat pump at partial load conditions / Youngju Joo 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. 893-901 Titre : Performance characteristics of a simultaneous cooling and heating multi-heat pump at partial load conditions Titre original : Caractéristiques de la performance de plusieurs pompes à chaleur assurant le chauffage et le refroidissement simultanés, fonctionnant en charge partielle Type de document : texte imprimé Auteurs : Youngju Joo, Auteur ; Hoon Kang, Auteur ; Jae Hwan Ahn, Auteur Année de publication : 2011 Article en page(s) : pp. 893-901 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Heat  pump  Heat  recovery  Variable  speed  Electronic  expansion  valve  R410A Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A simultaneous cooling and heating multi-heat pump can improve thermal comfort and energy efficiency through heat recovery at partial load conditions. The performance of a simultaneous heating and cooling multi-heat pump with four indoor units was measured by varying the compressor speed, EEV opening, and fan speed at full and partial load conditions in five operating modes. In the cooling-only and heating-only modes, the heating and cooling capacities were properly controlled by varying the compressor speed. However, in the cooling-main and heating-main modes under partial load conditions, a large imbalance between the cooling and heating capacities was observed even though the compressor speed was optimized. This capacity imbalance under partial load conditions was optimized by adjusting the EEV openings in the mode change unit and the outdoor unit. In addition, in the entire-heat recovery mode, rating compressor speed ratios were proposed under the full and partial load conditions. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711000041 [article] Performance characteristics of a simultaneous cooling and heating multi-heat pump at partial load conditions = Caractéristiques de la performance de plusieurs pompes à chaleur assurant le chauffage et le refroidissement simultanés, fonctionnant en charge partielle [texte imprimé] / Youngju Joo, Auteur ; Hoon Kang, Auteur ; Jae Hwan Ahn, Auteur . - 2011 . - pp. 893-901. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 4 (Juin 2011) . - pp. 893-901 Mots-clés : Heat  pump  Heat  recovery  Variable  speed  Electronic  expansion  valve  R410A Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A simultaneous cooling and heating multi-heat pump can improve thermal comfort and energy efficiency through heat recovery at partial load conditions. The performance of a simultaneous heating and cooling multi-heat pump with four indoor units was measured by varying the compressor speed, EEV opening, and fan speed at full and partial load conditions in five operating modes. In the cooling-only and heating-only modes, the heating and cooling capacities were properly controlled by varying the compressor speed. However, in the cooling-main and heating-main modes under partial load conditions, a large imbalance between the cooling and heating capacities was observed even though the compressor speed was optimized. This capacity imbalance under partial load conditions was optimized by adjusting the EEV openings in the mode change unit and the outdoor unit. In addition, in the entire-heat recovery mode, rating compressor speed ratios were proposed under the full and partial load conditions. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711000041