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인젝터 하이브리드 팽창 시스템을 이용한 히트펌프의 성능향상 연구
노철우(Chul Woo Roh),한경호(Kyeongho Han),김민수(Min Soo Kim) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.6
In this study, we propose an injector-hybrid expansion system (IHES) and its operating control methods in a R410A heat pump system. The use of injector in a heat pump system is the first try in the world. By the injector operation, the mass flow rate of refrigerant in a heat pump system is boosted by 150 % of the mass flow rate in a steady-state operating condition. The temporary increased mass flow rate increases heating and cooling capacity as well as heating and cooling coefficient of performance (COP). Test results show that the heating capacity was increased by about 5% and the heating COP was increased by about 6.2% with using the IHES.
황해 중부에서 저층 트롤에 어획된 어류의 종조성 및 양적변동
주현(Hyun Joo),추보라(Bora Chu),이성훈(Seonghoon Lee),유태식(Taesik Yu),한경호(Kyeongho Han) 한국해양바이오학회 2020 한국해양바이오학회지 Vol.12 No.1
Fish, caught by bottom trawling in the middle of the Yellow sea (east of Korea), in the spring and summer of 2016 were assessed for species composition and fluctuation in their abundance. The fish were studied at four research stations (St.) and were found to be composed of 46 species, 31 families, and 14 orders. The dominant species caught were Engraulis japonicus, Larimichthys polyactis, Johnius grypotus, Liparis tanakae, and Larimicthys crocea. All the species were assessed for their numbers, richness, diversity, and dominance to gain a measure of the biodiversity. The highest number of individuals was recorded at St. 4 (50,053 individuals), while the lowest number of individuals was recorded at St. 1 (44,090 individuals). The evenness index was the highest at St. 2 (E = 0.65) and lowest at St. 3 (E = 0.62). The diversity index was the highest at St. 4 (H’ = 2.31) and lowest at St. 3 (H’ = 2.23). Furthermore, the dominance index was the highest at St. 3 (D = 54.9%) and lowest at St. 2 (D = 47.7%).