외부바람의 영향을 고려한 난방공간에서의 하향토출 에어커튼의 성능

성순경(Sun-Kyung Sung) 대한설비공학회 2009 설비공학 논문집 Vol.21 No.7

Air curtains are widely used for gates of shopping mall, warehouse, cold stores and refrigerated display cabinets. The purpose of the air curtain is to reduce the infiltration of outdoor air and heat loss from the air conditioning space to ambient air. Design data for the air curtain given by previous researchers do not mention the influence of wind speed. Thus, this paper presents a performance of single jet air curtain in heating space when the wind blows toward the opening space of the building. A numerical simulation is used to study the influence of various parameters on the efficiency of the downward-blowing air curtain device which is installed inside of the wall above the door. The performance of the air curtain is evaluated by sealing efficiency which provides the assessment of the energy savings. A new safety factor is also proposed for determination of air curtain jet velocity under the various wind conditions.

제트팬 설치 간격과 재유입 현상 분석을 위한 모형실험

권오상,윤찬훈,윤성욱,김진,Kweon, Oh-Sang,Yoon, Chan-Hoon,Yoon, Sung-Wook,Kim, Jin 한국터널지하공간학회 2006 한국터널지하공간학회논문집 Vol.8 No.4

The domestic standards which used the standards of Road Association of Japan standards presents the distances of between jet-fans by the caliber of jet-fan. However, the Permanent International Association of Road Congress (PIARC) encourages it to be ten times a diameter of the tunnel. The distance of jet-fans installed in bases of two standards differs as much as two times, as so the proper basis after analysis of internal air current is needed since such difference can lead to disadvantage for selection of ventilation configuration. Based on Froude modeling theory, 1/40 scale acrylic model of a tunnel (215mm in diameter and 6.9m in length) and jet-fan (26.3mm and 31.6mm in caliber) was made for the measurement of changes in pressure and velocity due to the extension of tunnel for analysis of internal air current. And we measured the changes in pressure of surroundings of a jet-fan for confirmation of recirculation due to the exterior airs when the jet-fan is on. The results of the model test show that internal air current was not influenced by the caliber of jet-fan and its changes in pressure and velocity were stable in the point where it was nine times of diameter of the tunnel. Also the recirculation when the jet-fan is on could be verified. According to such results, in the cases of installing jet-fan in tunnels, the distances between jet-fans needs to be more than nine times the diameter. 국내에서 제트팬 설치 간격 기준으로 사용되고 있는 일본도로공단 기준은 제트팬의 구경에 따라 설치간격을 제시하고 있지만 국제 상설도로 협회(PIARC)에서는 터널 직경에 10배를 유지할 것을 권장하고 있다. 이 기준들에 의해 결정된 설치 간격은 최대 약 2배 정도의 차이를 나타내고 있으며 이러한 설치 간격의 차이는 터널 환기 방식 선정에 불리한 요건으로 작용될 수 있기 때문에 터널 내부의 기류분석을 통한 적정 설치 간격 기준이 필요하다. 본 논문에서는 Froude 상사이론에 기초하여 아크릴 재질의 축소비 1/40의 모형 터널(직경 215mm, 연장 6.9m)과 모형 제트팬(구경 26.3mm, 31.6mm)을 제작하여 터널 내부에서의 기류분석을 위해 터널연장을 따라서 압력과 속도의 변화를 측정하였고, 제트팬 가동시 제트팬 주위에서 외부 공기의 영향으로 발생될 수 있는 재유입 현상을 확인하기 위해서 제트팬 주변에서 압력변화를 측정하였다. 모형실험 결과에서는 터널 내부기류는 제트팬 구경에 영향을 받지 않고 터널직경에 약 9배 정도가 되는 지점에서 압력과 속도의 변화가 안정되는 것으로 나타났으며 제트팬이 가동되면서 발생되는 재유입 현상을 확인할 수 있었다. 이러한 결과를 통해 터널 내부에서의 제트팬 설치 시에는 터널 직경에 약9배 이상을 확보해야 한다고 판단된다.

수평토출에어커튼의 운전조건에 영향을 받는 차단 성능에 관한 연구

권용일(Yong-Il Kwon) 대한설비공학회 2021 설비공학 논문집 Vol.33 No.3

Air curtains are divided into horizontal and vertical blowing types. Each type is then subdivided according to the presence or absence of a suction port. Regardless of the blowing direction, in order to improve the sealing performance by reducing the amount of outside air intruding into the indoor, an air curtain can be provided with sufficient pressure to allow the blowing air jet to flow into the suction port on the opposite side. However, if the pressure of the air jet reaching the suction port is too high, the air jet reaching and colliding to the suction port is torn into indoors and outdoors, thus deteriorating the indoor air quality and causing energy loss. This study was carried out to evaluate the sealing performance of a horizontal blowing air curtain under various discharge pressures in an open entrance of small commercial space with heating condition. The optimum operating conditions of an air jet blown from the air curtain were also suggested.

에어제트를 이용한 웨이퍼 표면 입자 세정 효과에 대한 연구

박준섭(Joonsub Park),이정훈(Jeonghoon Lee) 대한기계학회 2020 大韓機械學會論文集B Vol.44 No.9

반도체 패키지 공정의 외관 검사 설비 내부에 설치된 에어제트의 유량에 따른 부유성 입자 세정효율에 대하여 실험적으로 고찰하였다. 웨이퍼 강제 오염 평가와 기류 해석을 통해 부유성 입자 세정에 가장 영향을 미치는 인자를 확인하여 최적 조건을 도출하였으며 세정 효율 최적 조건을 얻을 수 있는 방법에 대해 제시하였다. 에어제트 유량을 증가시킬수록 웨이퍼 표면의 입자 세정 효율은 65%까지 상승하다 유지되는 경향을 보였다. 기류 해석 결과, 에어제트와 주변 기구물과의 거리에 따라 웨이퍼 표면 유속이 증가되어 입자 세정 효과가 더욱 우수해지는 것을 확인하였다. 에어제트와 vision 기구물 간의 거리를 최적화한 결과 입자 세정 효율이 최소 10%에서 최대 89%로 나타났으며 실제 양산 공정에 적용한 결과 제품 수율이 급격히 상승함을 확인하였다. This study investigates the cleaning efficiency of floating particles for the flow rate of the air jet installed inside a vision inspection equipment in a production line of a semiconductor package. Parameters affecting the removal of floating particles were determined by an assessment for forcedly polluted particles on wafer and flow analysis for the air jet. Furthermore, these were utilized to find the optimal conditions for an efficient cleaning mechanism. Based on the results, it was observed that as the air jet flow rate increased, the removal rate of floating particles from the wafer surface increased and was maintained at a certain level (65 as a removal efficiency). Numerical analysis allowed us to find optimum conditions and additional parameters for the distance between the air jet and the vision inspection equipment, which helps identify the cleaning mechanism of wafer surface. The cleaning efficiency has been improved from at least 10 % to 89 % depending on the distance between the air jet nozzle and the vision inspection equipment. Based on the results of this experiment, this method was applied to actual mass production process. Consequently, the product yield was found to be dramatically improved; additionally, the quality of appearance was improved in the final products.

우산 빗물 제거용 Air Jet Dryer 장치

권용휘(Yong-Whee Kwon),김선조(Sun-Jo Kim),권용찬(Yong-Chan Kwon),김인환(In-Hwan Kim),임현준(HyunJune Yim) 대한기계학회 2019 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.7 No.3

우산 빗물 받이용 일회용 비닐봉투를 실질적으로 대체할 수 있도록 Air Jet를 이용한 우산의 빗물을 제거 장치를 설계하였다. 우산의 크기와 다양한 모양을 모두 사용 가능하도록 Open형 거치대에 우산의 지지대를 올려놓으면 작동되는 Touch형 스위치를 통해 작동이 용이하도록 설계하였다. 이를 위해 Water Droplet이나 Water Film에 작용하는 외력을 분석하였다. 유동장의 특성은 기본 CFD tool인 Discovery Live를 이용하여 공기 유동장 해석을 수행하였다. Air Jet Reflector는 사용자에게 물방울이 튀기지 않고 반사시키도록 설계하였으며, 그 밖에 배수구, 이동용 바퀴 등을 기본 설계안으로부터 수정하여 보완하였다. 이를 통해 친환경적 Air Jet 우산 빗물 제거기를 구현하였다. 공공 기관이 다수가 사용하는 상업 시설의 입구에 설치하면 1회용 우산 빗물 받이용 비닐의 사용을 획기적으로 감소시킬 수 있다. To practically replace disposable plastic bags for receiving rainwater from umbrellas, a rainwater removal system was designed by using an air jet blower. It was designed to be easy to operate through the touch type switch which was operated by placing the support of the umbrella on the open type holder so that the size and various shapes of the umbrella can be used. For this purpose, the external force acting on the water droplet or water film was analyzed. The flow field was analyzed using the Discovery Live, a basic CFD tool. Air Jet Reflector was designed to reflect water droplets to users, and drainage, wheels, etc. have been modified from the basic design. Through this, an eco-friendly air jet umbrella rain water removal system was developed. When installed at the entrance of commercial facilities used by many public institutions, the use of disposable umbrella rain gowns can be significantly reduced.

공조공간에서 수평토출형 에어커튼의 차단 성능

성순경(Sun-Kyung Sung) 대한설비공학회 2012 설비공학 논문집 Vol.24 No.11

Air curtains are widely used in commercial and public buildings to replace solid doors where traffic of people is predicted. At doorways where the solid door is open continuously or intermittently, an air curtain may be installed in order to reduce the flow of heat and moisture from the enclosed space to the outside. The purpose of this paper is to predict isolation performance of the single-sided air curtain when the wind is blowing. For the study, a numerical simulation is used to find the influence of various jet velocities on the efficiency of the single-sided air curtain device which is mounted at the side of the doorway. The isolation performance of the single-sided air curtain is evaluated by sealing efficiency which provides the assessment of the infiltration air ratio. According to the result of this study, the single-sided air curtain has lower sealing efficiency than downward-blowing air curtain. Therefore, for energy conservation in heating space, the single-sided air curtain is not recommended because of its low effectiveness.

Nylon/아라미드 원사특성이 방호의류용 에어텍스쳐사의 물성에 미치는 영향

김현아 ( Hyun Ah Kim ) 한국감성과학회 2014 감성과학 Vol.17 No.3

본 연구는 에어제트텍스쳐링 장치에서 공급되는 코어사와 이펙트사인 아라미드와 나일론의 구성이 방호의류용 아라미드/나일론 ATY와 아라미드 ATY의 물성변화에 대한 연구이다. 아라미드 필라멘트 표면의 매끄러움 때문에 아라미드 ATY의 강도 저하는 나일론 ATY에 비해 훨씬 높았다. 아라미드/나일론 ATY 강도는 ATY의 이펙트사인 나일론의 강도에 가장 영향을 많이 받았다. 나일론 ATY의 절단신도는 에어제트텍스쳐링 이전의 나일론에 비해 두 배정도 높은 값을 나타내었으며, 아라미드 ATY와 아라미드/나일론 ATY는 에어제트텍스쳐링 이전에 비해 5.9~6.7배 정도로 높았다. 아라미드 ATY의 초기탄성률은 아라미드의 에어제트텍스쳐링 이전에 비해 86.5%정도 감소하였으며, 아라미드/나일론 ATY의 초기탄성률은 아라미드 ATY와 나일론 ATY 초기탄성률의 산술평균치를 나타내었다. 아라미드/나일론 하이브리드 ATY의 습·건열 수축률은 나일론의 영향을 받음을 알 수 있었다. This study investigated the physical properties of aramid/nylon ATY and aramid ATY for protective garments according to the aramid and nylon characteristics fed on the core and effect components of air jet texturing equipment. Tenacity decrease of aramid ATY was much more higher than that of nylon ATY because of slick aramid filament surface. Tenacity of aramid/nylon ATY was most affected by the tenacity of nylon on the effect component of ATY. Breaking strain of nylon ATY was two times higher than that of nylon before air texturing, then, in case of aramid ATY and aramid/nylon ATY, were 5.9-6.7 times higher than those before air texturing. Initial modulus decrease of aramid ATY showed 86.5% of initial modulus of aramid before air texturing, then aramid/nylon hibrid ATY showed arithmetic average value of initial modulus of aramid and nylon ATY. Wet and dry thermal shrinkages of aramid/nylon hybrid ATY were dominated by those of nylon filament the effect component of ATY.

난방공간에서 에어커튼의 토출각도 변화에 따른 성능 변화

성순경(Sun-Kyung Sung) 대한설비공학회 2010 설비공학 논문집 Vol.22 No.2

Air curtains are widely used for gates of shopping mall, warehouse, cold stores and refrigerated display cabinets. The purpose of the air curtain is to reduce the infiltration of outdoor air and heat loss from the air conditioning space to ambient air. The discharge angle of air curtain is very important as the sealing efficiency is affected by it. This paper presents a performance of single jet air curtain in heating space when the discharge angle of nozzle changes. A numerical simulation is used to study the influence of various parameters on the efficiency of the downward-blowing air curtain device which is installed inside of the wall above the door. The performance of the air curtain is evaluated by sealing efficiency which provides the assessment of the energy savings. A condition of discharge angle that has the highest sealing efficiency is proposed.

에어 제트 직기의 메인 노즐 유동에 관한 수치해석적 연구

임채민(C.-M. Lim),이호준(H.-J. Lee),노석홍(S.-H. Noh),이권희(K.-H. Lee),김희동(H.-D. Kim),전두환(D.-H. Chun) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11

An air jet loom as one of shuttleless looms transports a yarn into warps using viscosity and kinetic energy of an air jet. A performance of this picking system depends on the ability of instantaneous inhalation/exhaust, the configuration of nozzle, the operation characteristics of a check valve, and so on. In the recent past many studies have been reported on an air jet discharged from the nozzle exit, but studies for understanding of the flow field characteristics associated with shear layer, and shock wave and boundary layer interaction in the nozzle were not conducted enough. In this paper, computational study was performed to explain the flow field in the air jet nozzle with an acceleration tube of a very small divergent angle. The result obtained from computational study show that the flow field in the air jet nozzle depends on the nozzle configuration and the length of acceleration tube.

수직원관내 에어제트 노즐을 사용하는 에어리프팅에 관한 실험적 연구

조남철(Cho Nam-Cheol),임광빈(Yim Kwang-Bin),김동춘(Kim Dong-Choon),김영중(Kim Young-Joong),이채문(Lee Chae-Moon),김종제(Kim Jong-Je) 한국태양에너지학회 2007 한국태양에너지학회 학술대회논문집 Vol.- No.-

Airlift pumps have some problems and limited applications as pumps for liquid transfer because of low energy efficiency, compared with the centrifugal pump. However, An advantage of airlift pump is in its geometrical simplicity, not having any moving part, so is suitable in lifting fluid including heavy metal and grit. In order to higher lifting head and provide airlifting data, air jet nozzle was used. We have performed experimentally according to various characteristics of pump as change of submerged depth, height of liquid-air mixture in the pipe(total head) and air flow. This paper is verified through experiments that airlift pump shows lifting ability for 3m(Sc=0.3) in comparison with conventional height, 2m(Sc=0.4).