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공조기용 Corrugate Fin-Tube 열교환기의 냉난방 및 착상성능
김주혁(Ju Hyok Kim),김홍성(Hong Sung Kim),이한춘(Han Choon Lee),사용철(Yong Cheol Sa),오세기(Sai Kee Oh) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
An outdoor heat exchanger of heat pump is used as an evaporator during heating operations and frost on its surface can grow at low outdoor temperatures. Frost increases the thermal resistance and the air-side pressure drop of evaporators, which decrease system heating performance. In this study, the evaporation, condensation and frosting performance of corrugate fin having an uniform air velocity and heat transfer is examined experimentally. In addition, the heat pump performance with the corrugate fin heat exchanger is compared with the louver fin heat exchanger. Heating capacity and COP of heat pump using corrugate fin increase by 36% and 19%, respectively.
습도센서를 이용한 VRF 시스템의 고효율 쾌적 부하 대응 운전에 관한 연구
장지영(Ji Young Jang),송치우(Chi Woo Song),윤필현(Phil Hyun Yoon),사용철(Yong Cheol Sa) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6
With the increase of energy saving for HVAC in building, the use of VRF system increases gradually. A humidity sensor was applied to a VRF system that can be operated by a single outdoor unit with multi indoor unit. The outdoor temperature, indoor humidity, temperature difference between the set and room temperature were using into optimized control logic. As a test result, the required cooling load decreased as the humidity was lower during cooling operation and the maximum efficiency improvement of about 36% was obtained in the low humidity region at the room temperature condition of 27℃. Also, considering the dew point temperature according to the outdoor temperature and the humidity during heating operation, an automatic frost delay control logic was established and the delay effect of about 12% was obtained at frost test condition
확대 모델을 이용한 루버 휜의 국부 열전달 특성변화에 관한 연구
김정국(Jungkuk Kim),小山繁(Shigeru Koyama),桑原憲(Ken Kuwahara),박병덕(Byung-Duck Park),김동휘(Dong-Hwi Kim),사용철(Yong-Cheol Sa) 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2
The present study was investigated the local heat transfer characteristics and temperature distribution on the louver fin by using the expansion model. Heat transfer rate, frost mass and temperature distribution of the louver fin under frosting condition were experimentally investigated. Local heat transfer rate and heat flux on the louver were analyzed by the conduction heat transfer between top and lower part of the louver. The experimental key parameter was brine inlet temperature(-5, -10, -15℃). The heat transfer performance and frost mass at brine temperature of -15℃ were increased by maximum 3 time than the brine temperature of -5℃. At all experimental case, local heat transfer rate and heat flux of the louver were almost symmetry at the louver number of 6. Especially, local heat transfer rate and heat flux were maximum increased on the louver number of 4 and 8.
류진우(Jin Woo Yoo),정융(Yoong Jeong),김귀택(Gwi Taek Kim),송치우(Chi Woo Song),윤필현(Pil Hyun Yoon),사용철(Yong Cheol Sa),김민수(Min Soo Kim) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6
In air heat pumps, frost naturally forms when the surface temperature of evaporator is lower than ice point. Judging the proper time of defrosting operation is one of the important task for air heat pump systems. Many different method were suggested previously but most of them are not cost-effective or realistic solution. In this study, a new method for determination of defrosting start time was suggested which calculates frost volume at evaporator. The frost volume was calculated with a dry bulb temperature and a humidity of outdoor air, evaporator temperature and degree of superheat (DSH). This method appropriately judge the start time of defrosting at the point within 15 minutes the system performance starts to decrease.