• Title, Summary, Keyword: 충진재

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Performance Characteristics of Small Sized Cross-flow Cooling Tower (소형 직교류형 냉각탑의 성능 특성에 관한 연구)

  • Sarker, M.M.A.;Kim, E.P.;Kim, J.D.;Jun, C.H.;Moon, C.G.;Yoon, J.I.
    • Journal of the Korea Society For Power System Engineering
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    • v.9 no.2
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    • pp.93-98
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    • 2005
  • The performance of cooling tower is dependent on the thermal performance of the packings. It's assessed by heat transfer rate and fan power. In this study, new packing was developed for application in compact type cross-flow cooling tower. The packing characteristic curve and the pressure drop curve were obtained by measuring packing characteristic values and pressure drops of small sized filler in comparison to existing mid-large sized filler. The heat transfer characteristics on small sized filler are about 66% higher than existing mid-large sized filler. The pressure drop characteristics on small sized filler are about two times of the pressure drop characteristics on existing mid-large sized filler.

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Effects of Fillers on Mixing and Mechanical Properties of Polymer Concrete (충진재가 폴리머 콘크리트의 배합과 역학적 성질에 미치는 영향)

  • 연규석;김광우;김기성;김관호
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.35 no.2
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    • pp.81-91
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    • 1993
  • This study was performed to evalute effects of fillers on the mixing characteristics and mechanical properties of polymer concrete. Two types of unsaturated polyester polymer and two types of epoxy resin were used as binder material, and the portland cement, a fly ash and heavy calcium carbonate were used as filler. Following conclusions were drawn from the research results. 1. Working life of polymer concrete was not affected by filler types, but affected significantly by polymer types and quantities of hardener and catalysts. 2. Without concerning polymer types, use of heavy calcuim carbonate as filler was the best in improving workability.3. The highest strength was achieved by heavy calcium carbonate in using unsaturated polyester resin and by fly ash in using epoxy resin type.4. Elastic modulus was in the range of 2.05X 10-5~2.6X 10-5gf/cm$^2$, which was approximatly 60% of that of cement concrete. Heavy calcium carbonate with unsaturated polyester resin and fly ash with epoxy resin showed relatively higher elastic modulus.

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The Experimental Study of the Hybrid Cooling Tower using Cross and Counter Type Fills (직교.대향류 충진재를 이용한 하이브리드 냉각탑에 대한 실험적 연구)

  • Jun, C.H.;Lee, H.S.;Lee, H.C.;Moon, C.G.;Kim, J.D.;Kim, Eun-Pil;Yoon, J.I.
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • pp.236-237
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    • 2005
  • An experimental study on the Hybrid Cooling Tower has been done having a rated capacity of 3RT. Counter flow type fill, cross flow type fill and hybrid-type fill which is combined with two type fills as previously stated having a height of 0.3m have been used in the 0.8m${\times}$0.4m${\times}$1.9m dimensional tower respectively. The heat exchanger is consisting of 2 or 3 rows. The relevant temperatures and the velocities were selected based on the typical Korean weather for the year round operation of the tower. The cooling capacity of the tower is explained with respect to varying air inlet velocities, wet-bulb temperatures, and air to cooling water volume flow rate ratio (L/G ratio). The capacity of the hybrid-type fill was much superior to other fills, but hybrid-type fill shows higher pressure drop.

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The Studies on the Fabrication and Properties of Friction Materials toy Aluminium Alloy Disk (알루미늄 합금 디스크용 마찰재의 제조 및 그 특성에 관한 연구)

  • 손태관;장상희;제갈영순
    • Composites Research
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    • v.16 no.4
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    • pp.22-28
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    • 2003
  • This article deals with the manufacture and test results of asbestos-free friction material for Aluminium at toy disk. In order to obtain optimum formulation, various formulations of fibres, matrix, modifiers, fillers, etc were designed and evaluated. The constant friction and brake dynamometer tests were performed to know weak and strong point for each friction material. The C21 formulation of various tested formulations exhibited superior friction constant(0.38∼38), fade rate (18%) by JASO C406 test mode and maximum wear 1.6 mm. disc wear 0.08 mm by JASO C427 test mode. The surface morphology of AL alloy disk(before and after test) was observed by Scanning Electron Microscope(SEM) and Image Analyzer.

PROPERTIES OF LIGHT-CURED COMPOSITE RESINS CONTAINING $SrF_2$, GLASS FILLER ($SrF_2$계 충진재를 함유한 광중합형 복합레진의 특성)

  • Kim, Hee-Jung;Kim, Kyung-Nam;Choi, Byung-Jai;Lee, Jong-Gap
    • THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY
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    • v.28 no.1
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    • pp.54-66
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    • 2001
  • The aim of this study was to investigate the fluoride release and some mechanical properties including 3-point bending strength, amount of abrasion, surface hardness, water sorption/solubility and cytotoxicity of the newly developed composite resins containing 8, 16, 24 wt% $SrF_2$ glass filler (VF8, VF16, VF24) and four commercially available composite resins, Heliomolar(HE), Verdonfil(VE), Z100(ZH) and Aelitefil(AE). To investigate cytotoxic effect, agar overlay assay was done. Amount of fluoride released into distilled water was measured over a 62-days period from VF8, VF16, VF24 and HE. Results were as follows: 1. Experimental composite resins showed similar mechanical properties to commercial composite resins, but 3-point bending strength and surface hardness of experimental composite resins were inferior to ZH. 2. Over a 62-day Period, the amount of fluoride released was ordered: VF24>VF16>VF8>HE. In experimental composite resins, the amount of fluoride released was 9-23 times greater than HE and seemed to be proportional to the content of $SrF_2$ glass filler. 3. Experimental composite resins and all control composite resins showed mild cytotoxicity. This study showed significantly greater fluoride release from newly developed composite resins than control(HE) and addition of $SrF_2$ glass filler did not decrease mechanical properties or increase cytotoxicity of composite resin. The results from this study imply that newly developed composite resin have adequate mechanical properites, mild cytotoxicity and some potential for secondary caries prevention.

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Research on Heat and Mass Transfer Coefficient in the Packing Layer With a Solar Desiccant Heating/Cooling System (태양열 데시컨트 냉난방시스템 중 충진층에 있어서의 열 물질전달에 관한 연구)

  • Yohana, Eflita;Choi, Kwang-Hwan;Kim, Bu-Ahn;Kim, Dong-Gyu;Paek, Ki-Dong;Kim, Ji-Won
    • Journal of the Korean Solar Energy Society
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    • v.26 no.3
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    • pp.17-24
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    • 2006
  • 최근에 에너지절약 차원에서 종래의 공조방식을 대신할 새로운 냉난방시스템 개발이 요구되고 있는데, 본 논문에서는 태양열 집열기를 이용하는 데시컨트 시스템 중 제습역할을 실질적으로 담당하는 제습기의 충진층 부분에서의 열 및 물질전달에 관한 일련의 해석 결과를 발표하고 있다. 제습과정에서 액체흡수제는 충진층에서 열 뿐만 아니라 물질전달을 수반하게 되는데, 이 결과 건물에 냉방 및 난방효과를 가져다 준다. 따라서 이 충진층의 최적 설계가시스템의 효율을 극대화하기 위해서는 무엇보다도 중요한데, 이를 위해서는 충진층에서의 열 및 물질전달 양상을 규명하여야 한다. 따라서 금번 실험에서는 공기와 액체흡수제와의 접촉면적을 넓히기 위해서 충진재로써 3cm(직경) ${\times}$ 3cm(높이)인 시판중인 플라스틱 재질을 사용하고, 실질적으로 40cm(너비)${\sim}$40cm(깊이)${\times}$40cm(높이)의 충진층을 직접 제작하여 실험을 행하였다. 그 결과, 공기측 열 및 물질전달 계수는 공기 온도와 밀접한 관계를 갖고 있으며, 또한 물질전달계수는 열전달계수와 같은 경향을 보이고 있음을 알 수 있었다.

Engineering Properties of Lightweight Foaming Grouting Materials for Underground Cavities (지반 공동의 충진을 위한 발포성 경량그라우트재의 공학적 특성)

  • Han, WooJin;Lee, Jong-Sub;Byun, Yong-Hoon
    • Journal of the Korean Geoenvironmental Society
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    • v.19 no.2
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    • pp.5-12
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    • 2018
  • Underground cavities could induce road subsidence, which have been frequently observed in urban areas. Therefore, adequate backfilling materials and the restoring methods of the cavities are required to prevent the road subsidence. The objective of this paper is to evaluate the suitability of backfilling methods using foaming lightweight grouting materials considering the flow values, unit weights, and air contents at slurry and expanded states, and unconfined compressive strengths. The grouting materials consist of water, cement, and foaming agent whose proportions of water, cement, and foaming agent are 25: 25: 1.0 and 25: 25: 1.2. The flow values of the two materials are greater than 200 mm, and their unconfined compressive strengths at 28 days age are smaller than 1.3 MPa. From the results, the two proportions of materials are expected to be effectively used as a backfilling material. However, the material components should be carefully mixed because poor mix of these materials could induce non-homogeneous distribution of air bubbles. The unexpectedly non-homogeneous distribution of air bubbles may induce significant cracks or additional cavities.

Three Dimensional Mathematical Simulation for Predicting the Shelf Life of Tofu Packaged in a Semi-rigid Plastic Container (플라스틱 용기 포장 두부의 유통기간 예측을 위한 3차원 수치모사)

  • Kim, Jai-Neung;Lee, Youn-Suk
    • Korean Journal of Food Science and Technology
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    • v.41 no.3
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    • pp.272-277
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    • 2009
  • In this research, three dimensional mathematical models were developed to predict the shelf life of tofu packaged in a semi-rigid plastic container. A model combining oxygen transfer through the package and oxygen consumption within the package was considered. According to the results, the model simulations estimated that the number of microorganisms in the filled water was higher than that in the tofu, suggesting the shelf life of packaged tofu was not affected by the number of microorganisms in the tofu product, but rather by the number of organisms in the filled water. Additionally, the effects of the physical properties of the packaging material, such as oxygen permeability through the package, oxygen diffusion coefficient, the initial oxygen concentration in the filled water, and the depth of the filled water in the packaged tofu, were also observed.

A Feasibility Study on GMC (Geo-Multicell-Composite) of the Leachate Collection System in Landfill (폐기물 매립시설의 배수층 및 보호층으로서의 Geo-Multicell-Composite(GMC)의 적합성에 관한 연구)

  • Jung, Sung-Hoon;Oh, Seungjin;Oh, Minah;Kim, Joonha;Lee, Jai-Young
    • Journal of the Korean Geosynthetics Society
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    • v.12 no.4
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    • pp.67-76
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    • 2013
  • Landfill require special care due to the dangers of nearby surface water and underground water pollution caused by leakage of leachate. The leachate does not leak due to the installation of the geomembrane but sharp wastes or landfill equipment can damage the geomembrane and therefore a means of protecting the geomembrane is required. In Korea, in accordance with the waste control act being modified in 1999, protecting the geosynthetics liner on top of the slope of landfill and installing a drainage layer to fluently drain leachate became mandatory, and technologies are being researched to both protect the geomembrane and quickly drain leachate simultaneously. Therefore, this research has its purpose in studying the drainage functions of leachate and protection functions of the geomembrane in order to examine the application possibilities of Geo-Multicell-Composite (GMC) as a Leachate Collection Removal and Protection System (LCRPs) at the slope on top of the geomembrane of landfill by observing methods of inserting filler with high-quality water permeability at the drainage net. GMC's horizontal permeability coefficient is $8.0{\times}10^{-4}m^2/s$ to legal standards satisfeid. Also crash gravel used as filler respected by vertical permeability is 5.0 cm/s, embroidering puncture strength 140.2 kgf. A result of storm drain using artificial rain in GMC model facility, maxinum flow rate of 1,120 L/hr even spray without surface runoff was about 92~97% penetration. Further study, instead of crash gravel used as a filler, such as using recycled aggregate utilization increases and the resulting construction cost is expected to savings.

Liquid Oxygen in Feeding Line during Propellant Filling and Holding (산화제 충진 및 대기 과정의 추진제 공급배관 내부 현상)

  • Kwon, Oh-Sung;Cho, Nam-Kyung;Chung, Yong-Gahp;Lee, Joong-Youp
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.34-37
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    • 2007
  • Propellant filling and holding test was carried out using liquid oxygen as a working fluid. The feeding line system has a filter at propellant tank outlet. Vaporization of liquid oxygen during holding after completion of filling and effect of vaporization to recirculation performance in this system was observed. Filling rate and pressure of tank ullage had the effect on state of liquid oxygen in feeding line. There was no geysering in feeding line during holding because of the position of filter.

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