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소구경 배관내 아이스슬러리의 유동형상 및 압력강하 특성에 관한 실험적 연구(2)
이동원,윤찬일,주문창 대한설비공학회 2002 설비공학 논문집 Vol.14 No.5
Pressure drop were experimentally investigated for ice slurry flowing in the acrylic pipes with inner diameter of 24 mm. Ice slurry was made from 6.5% ethylene glycol-water solution, and the pipes is consisted of horizontal, vertical (upward and downward) and <TEx>$90^{\circ}$ elbow pipe. The ice Packing factor (IPF) and the flow rate of the experiments were varied from 0 to 30% and from 5 to 70kg/min respectively The measured pressure drop in various pipe positions were compared with those for the solution flow (IPF=0). The pressure drop was larder than that for solution flows as the IPF increased when the flow rate was low or very high. Sharp increases in pressure drop were observed for the cases when IPF is more than 70% in horizontal and vertical pipes, whereas the pressure drop increased with the IPF simultaneously in an elbow pipe.
김정배,이순명,윤응상,이진국,주문창,이동원,곽희열,백남춘 한국태양에너지학회 2007 한국태양에너지학회 논문집 Vol.27 No.3
This study shows the results on thermal performance test with domestic solar collector for low-temperature applications using KS, then reveals the efficiency difference between KS and EN standard. Using the test results, this study presents the status of thermal performance with domestic solar collector including flat-plate, single evacuated, and double evacuated (with mirror or U-tube) solar collector.
저에너지태양주택의 여름철 피크시간대 전력부하제로화를 위한 축냉이용운전
이경호(Kyoung-Ho Lee),주문창(Moon-Chang Joo),백남춘(Nam-Choon Baek) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.11
This paper describes an experimental demonstration of control method for reducing cooling energy demand during on-peak period by use of building thermal mass and buffer thermal storage for heat pump. The demonstration test was performed at a low-energy solar house demonstration house. The house employed high-insulation and high performance windows to reduce energy demand and renewable energy systems such as solar heating, solar PV, and ground-source heat pump. The control method is to change the setpoint temperatures for indoor space and heat pump prior to and during the on-peak period. The lower and higher setpoints were 24℃and 28℃ for indoor space cooling and 10℃ and 20℃ for heat pump by considering indoor comfort and availability for cooling of chilled water. Two test days in similar weather conditions were compared. Test results showed that cooling electric demand was zero during on-peak period and cooling energy consumptions for the whole test days were nearly same.