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Optimal control of the gas-cooler pressure of a CO2 heat pump using EEV opening and outdoor fan speed in the cooling mode / Changhyun Baek in International journal of refrigeration, Vol. 36 N° 4 (Juin 2013) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 4 (Juin 2013) . - pp. 1276–1284 Titre : Optimal control of the gas-cooler pressure of a CO2 heat pump using EEV opening and outdoor fan speed in the cooling mode Titre original : Régulation optimale de la pression du refroidisseur de gaz d'une pompe à chaleur au CO2 à l'aide de l'ouverture du détendeur électronique et de la vitesse du ventilateur externe, en mode refroidissement Type de document : texte imprimé Auteurs : Changhyun Baek, Auteur ; Jaehyeok Heo, Auteur ; Jongho Jung, Auteur Année de publication : 2013 Article en page(s) : pp. 1276–1284 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : CO2  heat  pump;  Gas-cooler  pressure;  Refrigerant  charge;  Electronic  expansion  valve  opening;  Outdoor  fan  speed;  Compressor  frequency Résumé : The objective of this study is to investigate the control methods of the gas-cooler pressure in a CO2 heat pump. The cooling performance of the CO2 heat pump was measured by varying the refrigerant charge amount, EEV opening, compressor frequency, and outdoor fan speed at various outdoor temperatures. The effects of the EEV opening and the outdoor fan speed on the gas-cooler pressure and the COP were analyzed by using the experimental data. In the standard cooling condition at the compressor frequency of 45 Hz, the optimum gas-cooler pressure and the maximum COP were 9200 kPa and 3.04, respectively, at the optimum EEV opening of 41% and outdoor fan speed of 500 rpm. As the compressor frequency increased from 45 Hz to 55 Hz at the standard cooling condition, the optimum outdoor fan speed increased from 500 rpm to 700 rpm. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713000327 [article] Optimal control of the gas-cooler pressure of a CO2 heat pump using EEV opening and outdoor fan speed in the cooling mode = Régulation optimale de la pression du refroidisseur de gaz d'une pompe à chaleur au CO2 à l'aide de l'ouverture du détendeur électronique et de la vitesse du ventilateur externe, en mode refroidissement [texte imprimé] / Changhyun Baek, Auteur ; Jaehyeok Heo, Auteur ; Jongho Jung, Auteur . - 2013 . - pp. 1276–1284. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 4 (Juin 2013) . - pp. 1276–1284 Mots-clés : CO2  heat  pump;  Gas-cooler  pressure;  Refrigerant  charge;  Electronic  expansion  valve  opening;  Outdoor  fan  speed;  Compressor  frequency Résumé : The objective of this study is to investigate the control methods of the gas-cooler pressure in a CO2 heat pump. The cooling performance of the CO2 heat pump was measured by varying the refrigerant charge amount, EEV opening, compressor frequency, and outdoor fan speed at various outdoor temperatures. The effects of the EEV opening and the outdoor fan speed on the gas-cooler pressure and the COP were analyzed by using the experimental data. In the standard cooling condition at the compressor frequency of 45 Hz, the optimum gas-cooler pressure and the maximum COP were 9200 kPa and 3.04, respectively, at the optimum EEV opening of 41% and outdoor fan speed of 500 rpm. As the compressor frequency increased from 45 Hz to 55 Hz at the standard cooling condition, the optimum outdoor fan speed increased from 500 rpm to 700 rpm. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713000327