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차동안(Dong An Cha),권오경(Oh Kyung Kwon),오명도(Myung Do Oh) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.5
반도체 제조를 위한 공정에서는 과도한 열이 발생한다. 따라서 Chamber 내의 웨이퍼나 주변온도를 일정하게 유지할 수 있도록 온도의 정밀제어가 요구된다. 반도체 칠러는 산업용 칠러와는 다르게 운전조건이 24시간 년중 지속되므로 반도체 칠러는 전력소비량이 대단히 크며, 냉동기의 최적 운전제어를 통한 저소비전력 칠러 개발이 대단히 필요하다. 국내에서 판매되고 있는 반도체 칠러는 수입품에 비해 전력소비가 높아 제품 경쟁력이 낮은 실정이다. 이에 따라 본 연구에서는 국내에서 개발된 반도체 칠러에 관한 실험적 연구를 통하여 칠러의 부하변화 실험, 온도 상승 하강실험, 제어정밀도 실험 등을 통하여 칠러의 에너지절감 방향을 제시하고자 한다. 실험을 통하여 칠러의 냉각능력은 2.1~3.9 ㎾, EER은 0.56~0.93으로 측정되었다. 제어정밀도는 0℃에서 ±1℃, 30℃ 이상 설정에서는 ±0.6℃로 향상되는 것으로 나타났다. Excessive heat may be generated during the semiconductor manufacturing process. Therefore, precise control of temperature is required to maintain a constant ambient temperature and wafer temperature in the chamber. Compared to an industrial chiller, a semiconductor chiller’s power consumption is high because it is in continuous operation for a year. Because of this high power consumption, it is necessary to develop an energy-efficient chiller by optimizing the operation. The competitiveness of domestic products is low because of the high energy consumption. We experimentally investigated a domestic semiconductor by conducting load change, temperature rise and fall, and control precision experiments. The experimental study showed that the chiller had 2.1?3.9 ㎾ of cooling capacity and 0.56?0.93 of EER. The control precisions were ±1°C and ±0.6°C when the setting temperatures were 0°C and 30°C respectively.
수절환 방식을 이용한 지열히트펌프의 난방특성에 관한 연구
차동안(Dong An Cha),권오경(Oh Kyung Kwon),박성구(Sung Gu Park) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
본 연구의 목적으로는 냉매절환방식과 수절환방식에 의해 변화하는 10RT급 물 대 물 지열히트펌프의 성능을 평가하고자 하였다. 지열히트펌프의 성능실험은 압축기 회전수변화, 부하 측 입구온도의 변화, 그리고 지중열원의 온도 변화 등을 통하여 파악하였다. 본 연구에 사용된 히트펌프는 지중열원의 온도가 상승할수록 COP 및 난방능력이 상승하는 것을 확인하였다. 결과적으로, 대항류 형식의 수절환 방식이 냉매절환 방식에 비해 평균적으로 약 5~7%로 COP와 난방능력이 높은 것을 확인하였다. The objective of this study is to investigate the influence of the heating performance for a water-to-water 10RT 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 healing capacity and COP of the heal pump increased with increasing ground heat source temperature. As a result, the water switching method with counter flow, compared to a refrigerant switching method, improves the heating capacity and COP by approximately 5~7% in ave rage, respectively.
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.
EEV를 적용한 열교환방식별 지열히트펌프의 냉난방 특성
차동안(Dong An Cha),권오경(Oh Kyung Kwon),박성구(Sung Gu Park) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.5
본 연구의 목적은 EEV를 적용한 냉매절환과 수 절환에 의해 변하는 10RT급 지열히트펌프의 성능을 평가하고자 하볐다. 지열히트펌프의 냉난방 용량 및 성능실험은 10RT급 물 대 물 지열히트펌프의 EEV의 개도변화를 통하여 파악하였다. 본 히트펌프는 EEV의 개도가 커질수록 COP 및 냉난방능력이 상승하는 것을 확인하였다. 결과적으로, 대항류 수절환 방식이 냉매 절환 방식에 비해 평균적으로 약 5~8% 로 COP와 냉난방능력이 높은 것을 확인하였다. The objective of this study is to investigate the influence of the cooling and heating performance for a water-to-water 10RT ground source heat pump by using the water switching and refrigerant switching method for EEV. The test of water-to-water ground source heat pump cooling, heating capacity and COP was measured by varying the EEV open degree. The cooling, heating capacity and COP of the heat pump increased with increasing EEV open degree. As a result, compared to a refrigerant switching method, the water switching method with counter flow improves the cooling, heating capacity and COP by approximately 5~8% in average, respectively.
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),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.
유체의 유입위치와 회전길이에 따른 이중관 열교환기의 유동특성
차동안(Dong An Cha),이승하(Seung Ha Lee),권오경(Oh Kyung Kwon),설원실(Won Sil Seol) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
The length and position of the inlet port on the double tube heat exchanger is analyzed by CFX ver.11 for studying the characteristic of its flow uniformity. When the boundary conditions of the inlet temperature and mass flow rate were each 20 ℃ and 10 ~ 50 ㎏/min, 3 models that are based on the distance between the inlet port and the center of the heat exchanger(0, 5.025, 10.05 ㎜) were analyzed to find the uniformity of the flow rate. Based on the flow rate, 4 rotating lengths (23.723, 33.890, 44.057, 57.274 ㎜) were used to study the flow distribution according to Reynolds Number. The results show that, when the distance from the inlet to the position of the center of the heat exchanger is 10.05 ㎜ and the rotating length is 57.274 ㎜, the flow uniformity is the most unified.
차동안(Dong An Cha),권오경(Oh Kyung Kwon),박차식(Cha Sik Park) 한국지열·수열에너지학회 2012 한국지열에너지학회논문집 Vol.8 No.2
The objective of this study is to investigate the influence on the heating performance for a water-to-water 10RT 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 heating capacity and COP of the heat pump increased with increasing ground heat source temperature. As a result, compared to a refrigerant switching method, the water switching method with counter flow improves the heating capacity and COP by approximately 5% in average, respectively.
R245fa 냉매용 배열회수형 히트펌프 건조기의 사이클 해석
차동안(Dong-An Cha),배경진(Kyung-Jin Bae),권오경(Oh-Kyung Kwon) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
The objective of this paper is to study performance characteristics of heat pump dryer using R245fa known as the high temperature refrigerant. In this study, the main components of heat pump dryer was modeling as the compressor, condenser, evaporator and expansion device. To compare the performance and analyze the cycle characteristics with operating conditions, the cycle simulation was carried out with evaporator inlet air temperature and velocity. As a result, when the evaporator air inlet temperature was 60℃, the hot air temperature and system COP was 92.2℃, 3.43, respectively.