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인성진(Sungjin In),조금남(Keumnam Cho),임병한(Byunghan Lim),김하나(Hana Kim),윤백(Beak Youn) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.11
Environment issues have become a serious problem due to high GWP. Alternative refrigerants such as R-32 and HFO blend have suggested. The present study investigated the capacity, efficiency, discharge temperature of R-32 and HFO blend in a residential heat pump system in order to compare with those R-410A. Optimal refrigerant charge amount for R-32 and HFO blend systems were less by 18∼27% than those for R-410A system. Standard Cooling and Heating efficiency of R-32 system was increased over 5∼10% but discharge temperatures were higher by 6∼8℃ than R-410A system. Standard Cooling and Heating efficiency of HFO blend system was decreased over 2.4∼2.7% but discharge temperatures were higher by 4.8∼11.9℃ than R-410A system. R-32 SEER were increased by 6∼7% that those of R-410A system. SCOP were increased by 8∼9% that those of R-410A system. HFO blend SEER were almost same that those of R-410A system. SCOP were increased by 5∼7% that those of R-410A system. R-32 and HFO blend discharge temperature at SEER, SEER condition were higher by 1∼12℃ than R-410A system.
조진표(Jin-Pyo Cho),오왕규(Wang-Kyu Oh),김내현(Nae-Hyun Kim),윤백(Beak Youn) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The heat transfer and pressure drop characteristics of heat exchangers having louver fins were<br/> experimentally investigated. The samples had small fin pitches (1.0 mm to 1.4 mm), and experiments were<br/> conducted up to a very low frontal air velocity (as low as 0.3 m/s). The heat transfer coefficient curves crossed<br/> over as the Reynolds number decreased. Possible explanation is provided considering the louver pattern<br/> between neighboring fins. Different from the heat transfer coefficient, the friction factor did not show the<br/> flattening characteristic. The reason may be attributed to the form drag by louvers, which offsets the<br/> decreased skin friction at a low Reynolds number. The friction factor increased as the fin pitch decreased and<br/> the louver angle increased.
인성진(Sungjin In),조금남(Keumnam Cho),임병한(Byunghan Lim),김하나(Hana Kim),윤백(Beak Youn) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.6
Alternative refrigerant issue was increased in the past years due to low GWP. In this study, we research the characteristics of R-32, Standard and part load Performance of R-32. Optimal refrigerant charge amounts for R-32 systems were less by 20∼30% than those for R-410A system. Standard Cooling and Heating Energy Efficiency of R-32 system was increased over 5∼10% but discharge temperatures were higher by 6∼8℃ than R-410A system. Part load performances at cooling were increased by 6∼7% that those of R-410A system. Part load performances at heating were increased by 8∼9% that those of R-410A system. R-32 discharge temperature at SEER, SCOP condition were higher by 1∼12℃ than R-410A system.