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A novel defrosting control method based on the degree of refrigerant superheat for air source heat pumps / Yiqiang, Jiang in International journal of refrigeration, Vol. 36 N° 8 (Décembre 2013) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 8 (Décembre 2013) . - pp. 2278–2288 Titre : A novel defrosting control method based on the degree of refrigerant superheat for air source heat pumps Titre original : Nouvelle méthode de régulation du dégivrage fondée sur la surchauffe du frigorigène, pour une pompe à chaleur aérothermique Type de document : texte imprimé Auteurs : Yiqiang, Jiang, Auteur ; Jiankai, Dong, Auteur ; Minglu, Qu, Auteur Année de publication : 2014 Article en page(s) : pp. 2278–2288 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Defrosting  control  method;  refrigerant;  superheat;  heat  pump;  air-source;  experiment Résumé : When an air source heat pump (ASHP) unit operates for space heating at a frosting environment, periodic defrosting is necessary to maintain a high system performance. To defrost efficiently, it is necessary to find an effective defrosting control method. In this paper, an experiment was carried out on an ASHP unit with a capillary tube as a throttle device, under simulated frosting and defrosting conditions using time control defrosting method, and the experimental results are firstly presented. Secondly, a novel defrosting control method based on the degree of refrigerant superheat (DS) is reported. To validate the novel defrosting control method, a further experiment was conducted on another ASHP unit with an electronic expansion valve (EEV) as a throttle device, under simulated frosting and defrosting conditions. The experimental results demonstrated that when applying the novel defrosting control method, defrosting was initiated before the operating performances of ASHP unit rapidly deteriorated, which was more reasonable. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713001436 [article] A novel defrosting control method based on the degree of refrigerant superheat for air source heat pumps = Nouvelle méthode de régulation du dégivrage fondée sur la surchauffe du frigorigène, pour une pompe à chaleur aérothermique [texte imprimé] / Yiqiang, Jiang, Auteur ; Jiankai, Dong, Auteur ; Minglu, Qu, Auteur . - 2014 . - pp. 2278–2288. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 8 (Décembre 2013) . - pp. 2278–2288 Mots-clés : Defrosting  control  method;  refrigerant;  superheat;  heat  pump;  air-source;  experiment Résumé : When an air source heat pump (ASHP) unit operates for space heating at a frosting environment, periodic defrosting is necessary to maintain a high system performance. To defrost efficiently, it is necessary to find an effective defrosting control method. In this paper, an experiment was carried out on an ASHP unit with a capillary tube as a throttle device, under simulated frosting and defrosting conditions using time control defrosting method, and the experimental results are firstly presented. Secondly, a novel defrosting control method based on the degree of refrigerant superheat (DS) is reported. To validate the novel defrosting control method, a further experiment was conducted on another ASHP unit with an electronic expansion valve (EEV) as a throttle device, under simulated frosting and defrosting conditions. The experimental results demonstrated that when applying the novel defrosting control method, defrosting was initiated before the operating performances of ASHP unit rapidly deteriorated, which was more reasonable. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713001436