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자동차용(自動車用) 폐(廢) 라디에이터를 이용한 히트 파이프형 환기배열(換氣排熱) 회수기(回收器)에 관한 연구(硏究)
임용빈,최상조,김정훈,김종수,Im, Yong-Bin,Choi, Sang-Joe,Kim, Jeong-Hoon,Kim, Jong-Soo 한국자원리싸이클링학회 2006 資源 리싸이클링 Vol.15 No.3
최근 실내 공기질에 대한 관심이 집중되고 있으며, 본 연구에서는 자동차용 폐 라디에이터를 재활용하여 진동형 히트 파이프 (pulsating heat pipe : PHP)타입의 환기열 회수기로 제작하고, 그 성능에 대해 평가하였다. 작동유체로는 R-134a를 사용하였으며, 충전율은 내부체적비($\varphi$) 30% 및 40%로 PHP를 제작하였다. PHP의 높은 열전달 성능으로 인해 컴팩트 열교환기로 제작가능하였으며, 기존의 환기열 회수기와 대등한 성능을 보여주었다. 또한 부하변동에 따라 유닛의 개수를 증감할 수 있는 Cassette type일 뿐 아니라, 자동차용 폐 열교환기의 재활용으로 높은 경제성과 효율성이 기대된다. For keeping the indoor air quality, we develop the pulsating heat pipe(PHP) type heat recovery ventilator using an used radiator for vehicles. We compare the PHP type with existing model. There are some merits that are able to change the unit number according to heat load and show us the similar performance to existing models.
다분지 미니 채널 열교환기의 액단상 열전달 특성에 관한 연구
임용빈(Yong-Bin Im),이승훈(Seung-Hun Lee),김정훈(Jeung-Hoon Kim),김종수(Jong-Soo Kim) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.6
This research focused on the multi-pass heat exchanger using the minichannel possessing the spring fin. An air-water was used as working fluid. The characteristics of liquid single phase heat transfer were verified. The compact heat exchanger (heat transfer area density : ß= 2,146 ㎡/㎥), based on the shape of header(Top combining header), 63 minichannels (D<SUB>i</SUB> : 1.4 ㎜, L : 0.25 m) and the air side adopting the copper wire spring fin, was fabricated. The heat transfer area density of the air side was improved up to 161% when compared with the conventional fin-tube heat exchanger that adopts the heat transfer tube with the inner diameter of 5 ㎜. With regard to heat transfer performance, heat transfer rate per unit volume increased up to 142% when compared with the fin-tube heat exchanger adopting the heat transfer tube with the inner diameter of 5 ㎜.
장력 감김으로 부착된 가로방향 휜-미니채널의 공기측 열전달 특성
김종수,임용빈,Kim Jong-Soo,Im Yong-Bin 한국마린엔지니어링학회 2005 한국마린엔지니어링학회지 Vol.29 No.6
Pipes, tubes. and tubular sections with external transverse high fins have been used extensively for heating cooling, and degumidifying air and other gases. This work was performed to investigate an air side heat transfer charactieristics of minichannel with tension wound transverse fin. This estimate was confirmed conversion heat capacity the air side surface area enlargement and heat transfer charactieristics performed available inlet tube side hot water mass flux or outlet tube side air frontal air velocity. The most suitable tension wound transverse finned minichannel was measured extremely low in air side pressure drop and fin effectiveness $3.3\~4.4$. The pressure drop $0.9\~2.8Pa$ was ranged frontal air velocity $0.5\~1.2m/s$. It is also appeared that heat transfer in air side could be better conversion heat area which has been increased $330\%$ of heat capacity compared with the bare tube.
톱니형휜이 부착된 2중 열교환관을 이용한 엔진 배열회수기에 관한 실험적 연구
양태진,김종수,임용빈,Yang Tae-Jin,Kim Jong-Soo,Im Yong-Bin 한국마린엔지니어링학회 2005 한국마린엔지니어링학회지 Vol.29 No.6
In this study, high performance waste heat recovery heat exchanger was developed using the bayonet tube with spiral serrated fins. Especially, heat exchanger of the bayonet tube type was operated well because of double water passes mechanism and characteristics. A cooling water Passes down inner tubes to thimble-form tubes, then flows back up as it boils. The heat exchanger of bayonet tube type was composed of steel tube with 7channels$(I.D_1\;14mm.\;I.D_2\;31.6mm)$ and spiral serrated fins. The performance tests were conducted under the following conditions A cooling water flow rate was 273kg/h and engine l·pm was varied from 750rpm to 3500 rpm. From the experimental result. waste heat recovery was 9.21kW when engine rpm was 3500. and pressure drop was $15\~260mmHg/m^3$ The effectiveness of heat exchanger was about /$0.7\~0.9$. The performance of heat exchanger was evaluated by using the $\varepsilon-NTU$ method. In the study the NTU of the heat exchanger was $1.57\~2.33$.
진동형 히트파이프를 이용한 환기배열 회수용 미니채널 열교환기의 성능 실험
최우석(Woo-Seok Choi),임용빈(Yong-bin Im),최상조(Sang-Jo Choi),김종수(Jong-Soo Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In order to prevent deterioration of indoor air quality, it is needed to install a suitable ventilation facility equipped with heat recovery devices. In this study, the heat recovery ventilator was developed using a concept of pulsating heat pipe (PHP). Air flow rate was 300-1200 CMH, and its frontal air velocities were 0.5-1.5 m/s. The heat pipe type heat exchanger was serpentine type and it was composed of extruded flat aluminum tube with 6 channels (2.5 × 2.75 ㎜) and louvered fin. The heat transfer area was 9.05 ㎡, working fluid was R-134a and charging ratio (Φ) was 40% in volumetric. Heat recovery rate and pressure drop, j-factor, f-factor were major concern of this study. As a result, heat recovery rate was 1140 W(Φ: 40%, air velocity: 1.5 m/s). Also, the performance of heat exchanger was evaluated by using j-factor and f-factor method.