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차동안(Dong-an Cha),권오경(Oh-kyung Kwon),윤재호(Jae-ho Yun) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
Excessive heat may occur during semiconductor manufacturing process. Thus, precise control of temperature is required to maintain constant ambient-temperature and also wafer-temperature in the chamber. Compared to an industrial chiller, semiconductor chiller's power consumption is very high due to its continuous operation for a year. Considering the high power consumption, it is necessary to develop an energy efficiency chiller by optimizing operation control. The competitiveness of the domestic products is low because of its high energy consumption. Therefore, in this study, a domestic semiconductor chiller is experimentally investigated to suggest energy-saving direction by conducting load change, temperature rise and fall and control precision experiments.
차동안(Dong An Cha),권오경(Oh Kyung Kwon) 대한설비공학회 2010 설비공학 논문집 Vol.22 No.11
Excessive heat occurs during semiconductor manufacturing process. Thus, precise control of temperature is required to maintain constant chamber-temperature and also wafertemperature in the chamber. Compared to an industrial chiller, semiconductor chiller’s power consumption is very high due to its continuous operation for a year. Considering the high power consumption, it is necessary to develop an energy efficient chiller by optimizing operation control. Therefore, in this study, a semiconductor chiller is experimentally investigated to suggest energysaving direction by conducting load change, temperature rise and fall and control precision experiments. The experimental study shows the cooling capacity of dual-channel chiller rises over 30% comparing to the conventional chiller. The time and power consumption in the temperature rising experiment are 43 minutes and 8.4 kWh, respectively. The control precision is the same as ±1℃ at 0℃ in any cases. However, it appears that the dual channel’s control precision improves to ±0.5℃ when the setting temperature is over 30℃.
차동안(Dong-An Cha),김재돌(Jae-Dol Kim),장재은(Jae-Eun Jang),윤정인(Jung-In Yoon) 한국마린엔지니어링학회 2002 한국마린엔지니어링학회 학술대회 논문집 Vol.2002 No.-
A solution about noise of every kind happening in the inner part of a building is not very sufficient. Especially, because of diversity about living, consumption of water in a building of every kind is on the increase, and most of used water operate as drainage load. In this process, drainage noise in the drainage pipe laying generated frequently from a bathroom, a kitchen, or a various room of an apartment house like a various generation house, an apartment, villa, and a commercial building like a hotel, a motel is deteriorated a human desire about an easy life in a snug space, and extremely, it is also raise trouble each other. Accordingly, in this study, we work and set up as double structure about PVC pipe laying used of pipe laying materials in drainage pipe laying for a building of every kind, and we furnished data about drainage pipe laying noise reduction through an comparison experiment between data of research materials and that of existing about a specific character of drainage noise generated from drainage of a chamber pot and a bath tub in the building.
차동안(Dong-an Cha),권오경(Oh-kyung Kwon),윤재호(Jae-ho Yun),김대열(Dae-yeol Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
Excessive heat may occur during semiconductor manufacturing process. Thus, precise control of temperature is required to maintain constant ambient-temperature and also wafer-temperature in the chamber. Compared to an industrial chiller, semiconductor chiller's power consumption is very high due to its continuous operation for a year. Considering the high power consumption, it is necessary to develop an energy efficiency chiller by optimizing operation control. The competitiveness of the domestic products is low because of its high energy consumption. Therefore, in this study, a domestic semiconductor chiller is experimentally investigated to suggest energy-saving direction by conducting load change, temperature rise and fall and control precision experiments.
차동안(Dong-An Cha),권오경(Oh-Kyung Kwon),윤재호(Jae-Ho Yun) 대한설비공학회 2011 설비공학 논문집 Vol.23 No.1
The performance of louver-finned flat-tube and fin and tube radiators for computer CPU liquid cooling was experimentally investigated. In this study, 7 samples of radiators with different shape and pass number (1, 2, 10) were tested in a wind tunnel. The experiments were conducted under the different air velocity ranged from 1 to 4 ㎧. The water flow rate through a pass was 1.2 LPM. Inlet temperatures of air and water were 20℃ and 30℃ respectively. It was found that the best performance was observed in the louver-finned flat-tube sample considering pressure drop and heat transfer coefficient.
수절환 및 냉매절환방식에 따른 지열히트펌프의 냉방특성에 관한 연구
차동안(Dong An Cha),권오경(Oh Kyung Kwon),박차식(Cha Sik Park) 대한설비공학회 2012 설비공학 논문집 Vol.24 No.8
The objective of this study is to investigate the influence of the cooling performance for a water-to-water 10 RT ground source heat pump by using the water switching and refrigerant switching method. The test of water-to-water ground source heat pump was measured by varying the compressor speed, load side inlet temperature, and ground heat source side temperature. The cooling capacity and refrigerant mass flow rate of the heat pump increased with increasing ground heat source temperature. But COP of the heat pump decreased with increasing ground heat source temperature. As a result, the water switching method with counter flow, compared to a refrigerant switching method, improves the cooling capacity and COP by approximately 6~9% in average, respectively.
오토캐스케이드 방식을 적용한 극저온 칠러 시스템의 실험적 연구
차동안(Dong-an Cha),권오경(Oh-kyung Kwon),윤재호(Jae-ho Yun),김대열(Dae-yeol Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The purpose of this study is to investigate the performance of an autocascade refrigeration system using the refrigerant mixtures of R-134a(64~72wt%), R-23(20~25wt%) and R-14(8~12wt%) as working fluids by experiment. The experimental apparatus consisted of a autocascade system with a compressor, condenser, evaporator, gas-liquid separator and cascade condenser, etc. Two main causes to this failure were considered as follows. First, the pressure ratio in the compressor was extremely increased at the beginning of the experiment. Second, the outlet temperature in compressor was higher than its limited temperature. For a stable operation of the compressor, a portion of the mixed refrigerant was by-passed at the inlet of the heat exchanger and transferred directly to the suction of the compressor in the modified system. The experimental parameters were changed weight of R-134a(1800g, 2800g), R-23(700, 800, 900g) and R-14(300, 400, 500g). The results showed that the best performance in case of R-134a of 2800g, R-23 of 900g and R-14 of 500g.
세라믹 볼을 이용한 판형열교환기 세정에 관한 실험적 연구
차동안(Dong-An Cha),권오경(Oh-Kyung Kwon),채희만(Hee-Man Chae),권정태(Jeong-Tae Kwon),설원실(Won-Sil Seol) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
To maintain efficiency of heat exchanger, fouling of heat transfer surface is important to remove. This study was to investigate cleaning result of plate heat exchanger using ceramic ball. The fouling is created in heat transfer surface of plate heat exchanger using CaCO₃ as the fouling subject. The fouling concentration varied from 10 mol/m³ to 20 mol/m³. The overall heat transfer coefficient recovered 97.9% for 10mol/m³ case, and 94.3% for 20 mol/m³ case in comparison with initial state. It can be concluded that the cleaning of ceramic ball contribute significantly to the of performance recovery for overall heat transfer coefficient and fouling resistance after cleaning experiment.