Auteur Jaehyeok Heo
Documents disponibles écrits par cet auteur (7)
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Jaehyeok Heo, Auteur ; Min Woo Jeong, Auteur ; Changhyun Baek, Auteur |The performance degradation of air-source heat pumps cannot be avoided when they operate at both very low and high ambient temperatures. The refrigerant injection technique has rapidly developed in recent years due to its outstanding performance[...]
Article : texte imprimé
Piljoo Kang, Auteur ; Jaehyeok Heo, Auteur ; Rin Yun, Auteur |The condensation heat transfer characteristics of CO2 flowing in a horizontal smooth tube were investigated. The tube diameter was 5.15 mm. The condensation temperature ranged from −10 to 5 °C, and the mass flux was from 600 to 1000 kg m−2 s−1. [...]
Article : texte imprimé
Jaehyeok Heo, Auteur ; Min Woo Jeong, Auteur ; Yongchan Kim, Auteur |A heat pump has received much attention as substitute for the conventional boiler or heating coil because of its high efficiency. For the wide application of the heat pump, the most important design factor is the performance degradation upon its[...]
Article : texte imprimé
Changhyun Baek, Auteur ; Jaehyeok Heo, Auteur ; Jongho Jung, Auteur |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 frequenc[...]
Article : texte imprimé
Jaehyeok Heo, Auteur ; Hoon Kang, Auteur ; Yongchan Kim, Auteur |The refrigerant injection technique has rapidly developed in recent years due to its outstanding performance at low ambient temperatures, and various control methods for a heat pump with injection have been presented. However, most studies on cy[...]
Article : texte imprimé
Jaehyeok Heo, Auteur ; Rin Yun, Auteur ; Yongchan Kim, Auteur |In residential air-source heat pump systems, the refrigerant injection technique has rapidly developed in recent years due to its outstanding performance at low ambient temperatures. A numerical simulation model of a flash tank vapor-injection h[...]
Article : texte imprimé
Piotr A. Domanski, Auteur ; J. Steven Brown, Auteur ; Jaehyeok Heo, Auteur |This paper explores the thermodynamic performance limits of the vapor compression cycle. We have applied evolutionary algorithms to explore the performance of hypothetical refrigerants defined by the thermodynamic parameters used by the extended[...]
