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한화택(Hwataik Han),신동신(Dong Sin Shin),최창호(Chang-Ho Choi),이대영(Dae-Young Lee),김서영(Seo Young Kim),권용일(Yong-Il Kwon) 대한설비공학회 2008 설비공학 논문집 Vol.20 No.6
A review on the papers published in the Korean Journal of Air-Conditioning and Refrigeration Engineering in 2006 has been accomplished. Focus has been put on current status of research in the aspect of heating, cooling, ventilation, sanitation and building environments. The conclusions are as follows. (1) The research trends of fluid engineering have been surveyed as groups of general fluid flow, fluid machinery and piping, etc. New research topics include micro heat exchanger and siphon cooling device using nano-fluid. Traditional CFD and flow visualization methods were still popular and widely used in research and development. Studies about diffusers and com¬pressors were performed in fluid machinery. Characteristics of flow and heat transfer and pip¬ing optimization were studied in piping systems. (2) The papers on heat transfer have been categorized into heat transfer characteristics, heat exchangers, heat pipes, and two-phase heat transfer. The topics on heat transfer characteristics in general include thermal transport in a cryo-charnber, a LCD panel, a dryer, and heat generating electronics. Heat exchangers investigated include pin-tube type, plate type, ventilation air-to-air type, and heat transfer enhancing tubes. The research on a reversible loop heat pipe, the influence of NCG charging mass on heat transport capacity, and the chilling start-up characteristics in a heat pipe were reported. In two-phase heat transfer area, the studies on frost growth, ice slurry formation and liquid spray cooling were presented. The studies on the boiling of R-290 and the application of carbon nanotubes to enhance boiling were noticeable in this research area. (3) Many studies on refrigeration and air conditioning systems were presented on the practical issues of the performance and reliability enhancement. The air conditioning system with multi indoor units caught attention in several research works. The issues on the refrigerant charge and the control algorithm were treated. The systems with alternative refrigerants were also studied. Carbon dioxide, hydrocarbons and their mixtures were considered and the heat transfer correlations were proposed. (4) Due to high oil prices, energy consumption have been attentioned in mechanical building systems. Research works have been reviewed in this field by grouping into the research on heat and cold sources, air conditioning and cleaning research, ventilation and fire research including tunnel ventilation, and piping system research. The papers involve the promotion of efficient or effective use of energy, which helps to save energy and results in reduced environmental pollution and operating cost. (5) Studies on indoor air quality took a great portion in the field of building environments. Various other subjects such as indoor thermal comfort were also investigated through computer simulation, case study, and field experiment. Studies on energy include not only optimization study and economic analysis of building equipments but also usability of renewable energy in geothermal and solar systems.
프레온 냉동장치의 과열도에 관한 성능 특성 연구 -열교환기 타입별 비교-
홍석주,하옥남,권일욱,윤갑식,홍성인,김진현,김양현 대한설비공학회 2006 설비공학 논문집 Vol.18 No.11
Nowadays heat exchangers that have been applied for freon refrigerating systems, a shell and tube type condenser, but because of their large size, large space for installation and more amount of refrigerants are needed. Therefore, in this study, we will find the most suitable operating condition through the comparison of performance between the shell & tube type and shell & disk type heat exchanger with R22. The experiments are carried out for the condensing pressure of refrigeration system from 1,500kPa to 1,600kPa and for the degree of superheat from 0 to 10℃ at each condensing pressure. As a result of experiment, if the shell & disk type heat exchanger is applied for R22 refrigerating systems, minimized input of refrigerants and space required for installation will be secured, which will have a great contribute to financial improvement for industry.
R134a 냉동장치의 과열도 변화에 의한 성능 특성 연구
김성배,하옥남 朝鮮大學校 機械技術硏究所 2007 機械技術硏究 Vol.10 No.1
Since the use of CFCs and HCFCs refrigerants are to be restricted due to the depletion of ozone layer, this experiment applies the R134a gas to study the performance characteristic from the superheat control for improving the energy efficiency. The experiments are carried out for the condensing pressure of refrigeration system from 1.5MPa to 1.6MPa by 0.05 MPa and for superheat temperature from O℃ to 5℃ by 1℃ at each condensing pressure. As a result of experiment, when the superheat temperature is 1℃ at each condensing pressure, the refrigeration system has the highest performance.
R134a를 이용한 냉동장치의 성능특성에 관한 실험적 연구
김진현(Jin Hyun Kim),김종길(Jong-Kil Kim),김성배(Sung Bae Kim),하옥남(Ok Nam Ha) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Since the use of CFCs and HCFCs refrigerants are to be restricted due to the depletion of ozone layer, this experiment applies the R134a gas to study the performance characteristic from the superheat control for improving the energy efficiency. The experiments are carried out for the condensing pressure of refrigeration system from 1.5 ㎫ to 1.6 ㎫ by 0.05 ㎫ and for superheat temperature from 0℃ to 5℃ by 1℃ at each condensing pressure. As a result of experiment, when the superheat temperature is 1℃ at each condensing pressure, the refrigeration system has the highest performance.
윤갑식(Gab-Sig Yoon) 산업기술교육훈련학회 2017 산업기술연구논문지 (JITR) Vol.22 No.2
Refrigeration system has been widely used in almost all of the industries such as automobile, ship, skyscraper and huge chemical plant, including a small sized fridge. but it is a main effect of global warming. The global warming caused by the ozone layer destruction is a serious problem so to develop good refrigerants is necessary. In this study experiment characteristics of refrigerants, OS-12a and R407 were compared and studied wit h the temperature, pessure and rpm.
박동성(Dong-Seong Park),장현식(Hyun-Sik Chang),주재준(Jae-Joon Joo),문경모(Kyung-Mo Moon),조광운(Kwang-Woon Cho),김양수(Yang-Soo Kim),박주식(Ju-Shik Bak),권일근(Il-Keun Kwon),조면철(Myeon-Chul Cho),양승한(Seung-Han Yang) 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2
The main components of the KSTAR helium refrigeration system (HRS) can be classified into the warm compression system (WCS) and the cryogenic devices according to the operating temperature levels. The WCS itself consists of the compressor station (C/S) and the oil removal system (ORS). The process helium is compressed from 1 bar to 22 bar maximum in the C/S and downstream, the ORS removes the oil mixed in the helium to less than 10 ppbw as per the operation criteria of the cryogenic devices of the KSTAR HRS. After the installation, the pre-commissioning and commissioning activities were started on July, 2007. Before the start-up of the C/S, vibration measurement and the skid reinforcement jobs were performed for stable operation of the C/S. The results of the WCS performance tests met the requirements of the KSTAR HRS but satisfied the vibration level criteria only at the compressors’ full load condition.