• Title/Summary/Keyword: 냉각 덕트

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Experiment for Duct Development to Cool Components in Vehicle Engine Room (차량 엔진룸내 부품 냉각용 덕트 개발을 위한 실험)

  • Lee, Suk Young
    • Journal of Energy Engineering
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    • v.27 no.4
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    • pp.98-102
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    • 2018
  • In order to improve the durability of components in the vehicle engine room, an experiment to improve the air cooling effect of components by installing a cooling duct using intake air aiming at four components, such as generator, battery, ECU and power steel oil, Respectively, experimental results show that the overall component temperature has been reduced, and the reduced temperature difference is in the order of generator, ECU, power steel oil and battery. In order to improve the temperature difference due to these components, it is necessary to optimize the design through the flow analysis in the duct in the future.

연소실 냉각성능 개선을 위한 경사슬롯 막냉각에서의 유동 및 열전달 특성

  • 이세영;함진기;조형희
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 1999.10a
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    • pp.30-30
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    • 1999
  • 추진기관의 연소실과 같이 큰 열부하를 받는 경우 막냉각은 연소실을 보호하기 위해서 사용되는 대표적인 냉각기법이다. 막냉각의 성능을 극대화하기 위해서는 냉각유체를 2차원 슬롯을 통해서 분사시키는 것이 가장 효율적이지만 여러 가지 이유 때문에 실제 적용에 있어서는 슬롯입구 부근에 작은 구멍을 만들어 이로부터 분사되는 유체를 통해서 냉각시키게 된다. 본 연구에서는 주어진 덕트에서 분사율, 분사방법, 슬롯의 형상에 따른 슬롯 출구에서의 유동장 및 온도장 측정과 함께 물질전달 방법을 이용하여 슬롯 립(slot lip) 내벽에서 자세한 국소 열/물질전달계수를 구하였다. 분사율 0.5와 1.0에 대해서 주유동과 같은 방향으로 분사시켜줄 경우와, 유동을 제한시켜 주고 이차유동의 방향을 각각 주유동과 같은 방향과 반대방향으로 분사시키는 방법에 대하여 실험하였으며, 슬롯 입구에 경사슬롯을 설치하여 냉각유체를 분사시키는 방법에 대해서 실험하였다.

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Greenhouse Cooling Using Air Duct and Integrated Fan and Pad System (일체형 팬 앤 패드 시스템과 에어 덕트를 이용한 온실 냉방)

  • Nam, Sang-Woon;Kim, Young-Shik
    • Journal of Bio-Environment Control
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    • v.20 no.3
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    • pp.176-181
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    • 2011
  • The fan and pad evaporative cooling system is one of the main cooling methods in greenhouses. Its efficiency is very high, but it has some disadvantages as temperature gradient in greenhouse is large. This study was conducted to reduce the internal temperature gradients in the fan and pad cooling greenhouses. Experiments on cooling performance were carried out in a greenhouse equipped with air duct and integrated fan and pad system as an idea of this study. It showed that the cooling efficiency of an integrated fan and pad system was 75.7% in the first stage and 88.6% in the second stage. When this cooling system was operated for an unshaded and a shaded greenhouse, there were cooling effects of $5.7\sim7.6^{\circ}C$ and $7.4\sim9.7^{\circ}C$ to the control greenhouse, respectively. Maximum temperature differences in a cooling greenhouse, with a length of 18m, were $1.6\sim1.7^{\circ}C$ for shaded conditions and $2.3\sim2.7^{\circ}C$ for unshaded conditions. This greenhouse cooling method, with air duct and integrated fan and pad system, can reduce about 40~50% of the internal temperature gradients in the usual fan and pad cooling greenhouses.

Internal Flow Characteristics of a Steelworks Sintering Cooler by the Duct Shape of Cooler Fan Outlet (제철소 소결냉각용 축류송풍기 출구 덕트 형상에 따른 내부유동특성)

  • Choi, Young-Do;Kim, Kyoung-Hoon
    • The KSFM Journal of Fluid Machinery
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    • v.17 no.5
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    • pp.72-77
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    • 2014
  • Because of overload working condition of sintering cooler, the cooler fan often suffers the break or damage of rotor blade and fixing shaft. Therefore, internal flow characteristics of a steelworks sintering cooler fan by the duct shape of the cooler fan outlet, such as duct outlet opening ratio, duct height and dividing wall shape on the duct outlet flow pattern are examined in detail. The results show that relatively short duct wall height and attachment of dividing wall shape improves flow patterns considerably.

Flame deflector design of test facility to propulsion system model (추진기관 시스템 시험설비의 화염유도로 설계)

  • Jeon, Sung-Bok;Lee, Jae-Ho;Lee, Kwang-Jin;Cho, Nam-Kyung
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2012.05a
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    • pp.597-602
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    • 2012
  • Flame deflector is an important plan item for protecting propulsion system model, test facility, and life. This study suggests the way of flame deflector design in test facility evaluating performance of 75 ton and 300ton PSM. The flame deflector height was designed as 30m using a slope way in establishment location of facility. The flame deflector suitability was considered according to the shape of open and closed type. Also the cooling duct was made as modeling in accordance with core and side injection type.

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Integrity Evaluation of Control Rod Assembly for Sodium-Cooled Fast Reactor due to Drop Impact (낙하충격에 의한 소듐냉각고속로 제어봉집합체의 건전성 평가)

  • Lee, Hyun Seung;Yoon, Kyung Ho;Kim, Hyung Kyu;Cheon, Jin Sik;Lee, Chan Bock
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.41 no.3
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    • pp.233-239
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    • 2017
  • The CA (Control Assembly) of an SFR has a CRA(Control Rod Assembly) with an inner duct and control rod. During an emergency situation, the CRA falls into the duct of the CA for a rapid shut-down. The drop time and impact velocity of the CRA are important parameters with respect to the reactivity insertion time and the structural integrity of the CRA. The objective of this study was to investigate the dynamic behavior and integrity of the CRA owing to a drop impact. The impact analysis of the CRA under normal/abnormal drop conditions was carried out using the commercial FEM code LS-DYNA. Results of the drop impact analysis demonstrated that the CRA maintained structural integrity, and could be safely inserted into the flow hole of the damper under abnormal conditions.

Detailed Measurement of Heat/Mass Transfer in a Rotating Two-Pass Duct (II) - Effects of Duct Aspect Ratio - (이차 냉각 유로를 가진 회전덕트에서 열/물질전달 특성 (II) - 덕트 종횡비에 따른 영향 -)

  • Kim Kyung Min;Kim Yun Young;Rhee Dong Ho;Cho Hyung Hee
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.28 no.8 s.227
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    • pp.921-928
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    • 2004
  • Measurements of local heat/mass transfer coefficients in rotating two-pass ducts are presented. Ducts of three different aspect ratios (W/H), 0.5, 1.0 and 2.0, are employed with a fixed hydraulic diameter ($D_h$) of 26.7 nm. $90^{\circ}$-rib turbulators are attached on the leading and trailing walls symmetrically. The rib height-to-hydraulic diameter ratio ($e/D_h$) is 0.056, and the rib pitch-to-rib height ratio (p/e) is 10. The experimental conditions are the same as those of the previous part of the study. As the rib height-to-duct height ratio (e/H) increases, the core flow is more disturbed and accelerated in the midsections of ribs. Therefore, the obtained data show higher heat/mass transfer in the higher aspect ratio duct. Dean vortices also augment heat/mass transfer in the turn and in the upstream region of the second pass. However, the effect becomes less significant for the higher aspect ratio because the surface area increases in the present geometric condition. The effect of rotation produces heat/mass transfer discrepancy.

Development of Temperature Control Technology of Root Zone using Evaporative Cooling Methods in the Strawberry Hydroponics (증발 냉각방식을 이용한 딸기 수경재배의 배지 온도조절 기술 개발)

  • Kim, Ki-Dong;Ha, Yu-Shin;Lee, Ki-Myung;Park, Dae-Heum;Kwon, Soon-Gu;Park, Jong-Min;Chung, Sung-Won
    • Journal of Bio-Environment Control
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    • v.19 no.4
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    • pp.183-188
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    • 2010
  • It is necessary to develop an efficient and affordable cooling technology and apply the practical system to rural farmhouse, control to adequate growth environment by adjusting temperature of root zone. A study on managing medium temperature of the hydroponics for strawberry cultivation was conducted and feasible evaporative cooling system for the media cooling were as follows: Characteristics of temperature drop were investigated for the evaporative cooling devices using microporous film duct, felt mulching on media surface, and water permeable sheet in culture tank. The evaporative device with water permeable sheet in culture tank was the most efficient and economic on media cooling system.

A study on the cooling method for LCD projection TV with 3 projection lens (3투사렌즈방식 LCD 프로젝션 TV의 엔진 냉각에 관한 연구)

  • Kim, Chul-Hwan;Joe, Yeo-Uk
    • Proceedings of the KSME Conference
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    • 2004.11a
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    • pp.1253-1257
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    • 2004
  • We have developed new rear LCD Projection TV engine with 3 projection lens. It has high brightness and contrast ratio, however poor cooling conditions. If optical components close to light source, optical components are damaged on high temperature, especially the blue among RGB colors is weakest by heat In this study, a new enhanced cooling method of LCD projection TV with 3 lens is shown: the best suited design of duct and relations between LCD panel and polarizer lifetime with changed area of duct.

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A study of method to refrain from the winding temperature rising of three-phase induction motor (고압전동기 권선온도 냉각설비 개선 사례 연구)

  • Choi, In-Seok;Hong, Jeong-Jo;Lee, Eun-Chun;Hong, Young-Jae;Hong, Hyun-Pyo
    • Proceedings of the KIEE Conference
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    • 2015.07a
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    • pp.831-832
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    • 2015
  • K-water에서는 대청댐 하류의 용수를 취수하여 대청광역 계통에 1일 98만㎥을 공급할수 있는 현도취수장을 운영하고 있다. 취수장에는 고압전동기 10대가 운영되고 있으며, 장시간 연속운전 및 하절기 주위온도 상승 등으로 권선온도가 상승되어 설비의 안전성 문제가 제기되어 왔다. 취수펌프동 실내온도 및 고압전동기 권선온도 저감을 위해 펌프동 배기시스템 운영시간 변경 및 고압전동기 냉각 흡기덕트 설치 등의 개선 노력으로 권선온도 저감은 물론 에너지절감 및 기기의 수명연장 등 설비 운영의 안전성을 확보한 연구결과이다.

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