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슐리렌 장치를 활용한 기상 냉매 주입 과정의 유동 가시화
황인찬(Inchan Hwang),이상욱(Sangwook Lee),김민수(Min-Soo Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
In this study, we investigate the flow behavior of refrigerant R134a vapor injection process in a pressurizing chamber. We conducted experiments under various injection pressures using a image processing. In order to observe the flow behavior, the injection process was filmed with short term images through high speed camera. By using schlieren method, we can distinguish R134a and CO₂ by the difference of density of gases. From the injection images, we marked the boundary of R134a according to the change in light intensity levels to investigate injection characteristics such as the tip penetration and cone angle. The results showed that the velocity of injection tip is affected by the injection pressure and the chamber pressure. The cone angle of the injection was also investigated with various pressure conditions. Furthermore, we could observe that the injection stream was depleted as the pressure difference decreases.
슐리렌 장치를 활용한 기상 냉매 주입 과정의 유동 가시화
황인찬(Inchan Hwang),이상욱(Sangwook Lee),김민수(Min-Soo Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
In this study, we investigate the flow behavior of refrigerant R134a vapor injection process in a pressurizing chamber. We conducted experiments under various injection pressures using a image processing. In order to observe the flow behavior, the injection process was filmed with short term images through high speed camera. By using schlieren method, we can distinguish R134a and CO₂ by the difference of density of gases. From the injection images, we marked the boundary of R134a according to the change in light intensity levels to investigate injection characteristics such as the tip penetration and cone angle. The results showed that the velocity of injection tip is affected by the injection pressure and the chamber pressure. The cone angle of the injection was also investigated with various pressure conditions. Furthermore, we could observe that the injection stream was depleted as the pressure difference decreases.
황인찬(Inchan Hwang),김민수(Min Soo Kim) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
Water heating is the large energy user in the residential, commercial, industrial and power sectors. Using water supply heat pump(WSHP) system saves energy for generating hot water. This paper presents algorithm for testing the performance of WSHP under on-design and off-design conditions. We analyze the transient performance of the cycle of using and refilling half of the hot water in a flash tank. Compressor frequency is set as a variable for testing off-design condition. By comparing the tendency with the existing experimental data, the accuracy of the algorithm is determined.
전기 투석을 이용한 KCOOH 액체 제습제 재생에 관한 수학적 모델 개발 및 검증
홍정국(Jeong Kuk Hong),황인찬(Inchan Hwang),노철우(Chul Woo Roh),김민수(Min Soo Kim) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
현재 액체식 제습 시스템의 재생기에서 사용되는 에너지 저감을 위해 전기 투석을 시스템에 결합하려는 시도가 이루어지고 있다. 그러나 LiCl, LiBr, CaCl₂와 같은 액체 제습제는 실험을 통해 검증된 전기 투석 재생 모델이 존재하지만, 독성과 부식성이 없다는 장점을 가진 KCOOH 액체 제습제에 대해서는 전기 투석 재생 실험 및 모델 개발이 수행되지 않았다. 본 연구에서는 전기 투석을 이용한 KCOOH 액체 제습제 재생 시스템의 성능을 예측하기 위한 수학적 모델을 개발하였다. 모델에는 초기 제습제 농도, 스택 전류, 용액 온도, 제습제 체적 유량과 같은 주요 운전 변수의 영향이 포함되었으며, 전류에 의한 이온 이송, 전기 삼투 현상, 농도 삼투 현상이 고려된 Overall Mass Transport 모델이 적용되었다. 개발된 수학적 모델은 높은 정확도로 실험의 주요 결과값을 예측하였다.