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초소수성 특성을 갖는 다중 구리관의 응축 열전달에 관한 시각화 실험 연구
류한솔(Han Sol Ryu),이민형(Min Hyung Lee),신영훈(Young Hun Shin),이권영(Kwon Young Lee),황운봉(Un Bong Hwang) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
The purpose of this research is to improve the condensation heat transfer performance for improving the efficiency of the condenser. And the research for the improvement of condensation heat transfer performance was conducted by using the hydrophobic coated tubes. In this research, a thermoelectric device called Thermal Electric Cooler (TEC) was used to solve the complexity and the size of the experimental devices, which are the problems of the existing research. The research on the hydrophobic multi-tube and the droplet behavior between the tubes, which were not conducted in the previous research, was conducted. And the heat transfer coefficient and the droplet behavior of hydrophobic tubes was analyzed and compared with those of the bare copper tubes. As a result of the analysis, it can be seen that the hydrophobic coated tube has better heat transfer performance than the bare copper tube. It is predicted that the use of superhydrophobic will solve the energy efficiency problem.
초소수성 특성을 갖는 다중 구리관의 응축 열전달에 관한 시각화 실험 연구
류한솔(Han Sol Ryu),이민형(Min Hyung Lee),신영훈(Young Hun Shin),이권영(Kwon Young Lee),황운봉(Un Bong Hwang) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
The purpose of this research is to improve the condensation heat transfer performance for improving the efficiency of the condenser. And the research for the improvement of condensation heat transfer performance was conducted by using the hydrophobic coated tubes. In this research, a thermoelectric device called Thermal Electric Cooler (TEC) was used to solve the complexity and the size of the experimental devices, which are the problems of the existing research. The research on the hydrophobic multi-tube and the droplet behavior between the tubes, which were not conducted in the previous research, was conducted. And the heat transfer coefficient and the droplet behavior of hydrophobic tubes was analyzed and compared with those of the bare copper tubes. As a result of the analysis, it can be seen that the hydrophobic coated tube has better heat transfer performance than the bare copper tube. It is predicted that the use of superhydrophobic will solve the energy efficiency problem.
초소수성 특성을 갖는 다중 구리관의 응축 열전달에 관한 시각화 실험 연구
류한솔(Han Sol Ryu),이민형(Min Hyung Lee),신영훈(Young Hun Shin),이권영(Kwon Young Lee),황운봉(Un Bong Hwang) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
The purpose of this research is to improve the condensation heat transfer performance for improving the efficiency of the condenser. And the research for the improvement of condensation heat transfer performance was conducted by using the hydrophobic coated tubes. In this research, a thermoelectric device called Thermal Electric Cooler (TEC) was used to solve the complexity and the size of the experimental devices, which are the problems of the existing research. The research on the hydrophobic multi-tube and the droplet behavior between the tubes, which were not conducted in the previous research, was conducted. And the heat transfer coefficient and the droplet behavior of hydrophobic tubes was analyzed and compared with those of the bare copper tubes. As a result of the analysis, it can be seen that the hydrophobic coated tube has better heat transfer performance than the bare copper tube. It is predicted that the use of superhydrophobic will solve the energy efficiency problem.
흡음 석고보드 천장재에 의한 저주파 중량 바닥충격음의 저감 효과
송한솔,류종관,Song, Han-Sol,Ryu, Jong-Kwan 한국음향학회 2018 韓國音響學會誌 Vol.37 No.5
본 연구에서는 흡음 석고보드 천장재에 의한 바닥충격음 저감 효과를 조사하기 위해 잔향실에서의 흡음률 측정과 바닥충격음 성능평가 시험동에서의 바닥충격음 성능평가를 실시하였다. 먼저, 흡음률 측정은 흡음 석고보드, 흡음석고보드+글라스울, 흡음 석고보드 이중 천장재(흡음 석고보드+글라스울+흡음 석고보드)를 대상으로 실시하였다. 측정결과, 흡음 석고보드의 경우 200 Hz과 630 Hz 대역에서 약 0.1~0.5의 흡음률을 나타냈으며, 글라스울을 추가하였을 때 전체 측정 주파수대역(50 Hz ~ 630 Hz)에서 흡음률이 상승하였다. 흡음 석고보드를 추가 설치하였을 때 250 Hz 대역까지 흡음률이 크게 상승하였으나, 315 Hz 이상 대역에서는 흡음률이 감소하였다. 상기 3개의 흡음석고보드 및 일반 석고보드 천장재와 맨슬래브(천장 무) 대상으로 바닥충격음 차단 실험동에서 바닥충격음 차단성능 측정을 실시하였다. 측정결과, 흡음석고보드+글래스울과 흡음석고 보드 이중 천장재의 일반 석고보드 대비 중량충격음의 저감량은 단일평가지수 기준으로 3 dB ~ 4 dB인 것으로 나타났다. 맨슬래브 대비 중량충격음의 저감은 주로 125 Hz ~ 500 Hz 대역에서 발생하였으며 250 Hz 대역에서 최대의 저감량을 나타냈다. This study investigated effects of absorbent gypsum board in the ceiling on low-frequency heavyweight floor impact sound through sound absorption coefficient and floor impact sound measurement. The sound absorption coefficients were measured with sound absorbent gypsum board, glass wool on gypsum board, and a double panel absorbent gypsum board (absorbent gypsum board + glass wool + absorbent gypsum board). Result showed that the absorbent gypsum board had sound absorption coefficient of 0.1 ~ 0.7 from 200 and 630 Hz octave band. The sound absorption coefficient was increased in all frequency range by adding glass wool. Additional absorbent gypsum board increased sound absorption coefficient up to 250 Hz octave band, but decreased over 250 Hz. Heavyweight floor impact sounds were measured in test building for three materials above, gypsum board, and bare slab. Result showed that glass wool on gypsum board and a double panel absorbent gypsum board reduced by 3 dB ~ 4 dB (single number quantity) heavyweight floor impact sound. Comparing with bare slab condition, floor impact sound reduction was mainly found from 125 Hz to 500 Hz octave band, and the maximum reduction was shown in the 250 Hz octave band.
주거 공간에서 고령자 청력손실을 고려한 소음 및 잔향에 따른 음성 전송 성능의 주관적 평가
오양기,류종관,송한솔,Oh, Yang Ki,Ryu, Jong-Kwan,Song, Han-Sol 한국음향학회 2018 韓國音響學會誌 Vol.37 No.5
본 논문은 주거공간에서 고령자 청력손실을 고려한 소음 및 잔향에 따른 음성 전송 성능을 청취실험을 통해 평가하였다. 주거환경 소음으로 바닥충격음, 교통소음, 공기전달음과 배수소음을 대상으로 하였으며, 공동주택의 잔향환경을 모사하기 위해 실내음향 컴퓨터시뮬레이션을 실시하여 충격응답를 추출하였다. 청취실험 음원은 고령자 청력손실(65세 남성)을 반영하기 위해 소음 및 단어 음원의 고주파대역의 음압레벨을 저감시킨 음원(고령자 음원)과 정상청력을 반영한 원음(청년 음원)을 대상으로 하였다. 청취실험은 각각 3개의 소음레벨($L_{Aeq}$ 30, 40, 50 dB)과 잔향시간(0.5, 1.0, 1.5 s)을 갖는 음환경 조건에서 제시된 단어($L_{Aeq}$ 55 dB)의 음성요해도(speech intelligibility)와 듣기 어려운 정도(listening difficulty)를 평가하는 것으로 하였다. 청취실험 결과, 음성레벨이 55 dB($L_{Aeq}$)일 때 잔향시간 1.0 s 이하 조건에서 충격소음(점핑음) 50 dB($L_{i,Fmax,AW}$)와 정상소음(도로, 음악, 배수 소음) 40 dB($L_{Aeq}$) 이하의 소음레벨에서는 고령자 및 청년 음원 모두 90 % 이상의 음성요해도와 30 % 이하의 듣기 어려운 정도를 확보할 수 있을 것으로 판단된다. 고령자 청력손실을 반영한 고령자 음원의 경우 청년 음원 보다 음성요해도는 0 % ~ 5 % 낮았고 듣기 어려운 정도는 2 % ~ 10 % 높은 것으로 나타났다. This study investigated the effect of noise and reverberation on subjective measure of speech transmission performance for elderly person with hearing loss in residential space through listening test. Floor impact, road traffic, airborne, and drainage noise were employed as the residential noise, and several impulse responses were obtained through room acoustical computer simulation for an apartment building. Sound sources for the listening test consisted of residential noises and speech sounds for boh the young (the original sound) and the aged (the sound filtered out by filters with frequency responses of hearing loss of 65 years elderly person). In the listening test, subjects evaluated speech intelligibility and listening difficulty for the presented word ($L_{Aeq}$ 55 dB) at three noise levels ($L_{Aeq}$ 30, 40, 50 dB) and three reverberation times (0.5, 1.0, 1.5 s). Results showed that the residential space with noise level lower than equal to 50 dB ($L_{i,Fmax,AW}$) for jumping noise and 40 dB ($L_{Aeq}$) for road traffic, airborne, and drainage noise had speech intelligibility of 90 % and over and listening difficulty of 30 % and below. Speech intelligibility and listening difficulty for the aged sound source was shown to be 0 % ~ 5 % lower and 2 % ~ 20 % higher than those for the young sound source, respectively.