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대체냉매 R410A를 사용한 공조용 열교환기의 관내 유동 및 증발 열전달 특성에 관한 연구
정효창(Hyo-Chang Jung),민중기(Joong-Ki Min),박근연(Kun-Yeun Park),정모(Mo Chung),배철호(Chul-Ho Bai),윤백(Baek Youn),김영생(Young-Saing Kim),길성호(Seong-Ho Gil) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
Evaporation heat transfer in Smooth, Hex-type and B-type tubes of outer diameter 9.52 ㎜ with an alternative refrigerant of R410A(R32/R125, 50/50wt%) has been experimentally studied for a system pressure range of 0.65 ~ 0.75 ㎫. The heat transfer coefficients and the pressure drop are measured and presented as a function of quality and mass flux for the tubes. The average evaporation heat transfer coefficients for the Hex-type tube are higher than those for B-type and smooth tube. The pressure drops for the B-type tube are higher than those for the Hex-type. The evaporation heat transfer coefficients and pressure drops in Hex-type and B-type tubes for R410A are correlated as functions of quality and the Martinelli parameter.
한승혜,김용호,서호석,황규동,정효창,손지형,이승현,Han Seung-Hea,Kim Yong-Ho,Seo Ho-Seok,Hwang Gyu-Dong,Jung Hyo-Chang,Son Ji-Hyung,Lee Seung-Hyun 대한한방내과학회 2003 大韓韓方內科學會誌 Vol.24 No.4
Objective: The purpose of this study is to inspect recovery state of patients suffering from nausea and vomiting, who received auricular acupuncture. On the other hand, we are going to examine effects of auricular acupuncture through the study of treatises on nausea and vomiting. Nausea and vomiting are ordinary symptoms of dispositional or functional disease. The symptoms often appear without obvious disorders that can be detected on various inspection. Methods: Auricular acupuncture needling was given to the patients who had reported the symptoms of nausea and vomiting. They were hospitalized at the korean oriental internal medicine of National Medical Center from Dec. 2002 to Aug. 2003. Result: Relatively quick response of treatment was acquired after auricular acupuncture on nausea and vomiting. Conclusion: This study shows that auricular acupuncture is effective in reducing nausea and vomiting without regard to causal disease.