• Title/Summary/Keyword: 샌드위치패널

Search Result 140, Processing Time 0.027 seconds

Heating Value and Noxious Gases Generation of Sandwich Panel Core using Artifical Lightweight Aggregate (다공성 경량골재를 충전재로 활용한 샌드위치 패널 심재의 발열량 및 유해가스 배출특성)

  • 노정식;도정윤;문경주;조영국;소양섭
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2003.05a
    • /
    • pp.261-266
    • /
    • 2003
  • This study is to investigate the heating value and noxious gases generation such as CO, NO and $SO_2$ known as dangerous gas for human from specimen made of cement and lightweight aggregate. The most quanity of CO gas is generated in EPS(Expanded Poly Styrene), core of commercial sandwich panel. Although specimens mainly composed of cement discharged the relatively less CO gas than organic core such as EPS, specimens which SBR was added discharged the very much amount of CO gas similar to EPS and especially, specimens including foaming agent, gas foaming agent or redipersible powder of VA/VeoVa showed the good properties in the generation of CO gas. From the standpoint of the generation of NO and $SO_2$ gas, both the core of commercial sandwich panel such as EPS, Glass wool and specimens made with polymer dispersion such as St/BA and SBR discharge the very much amount of NO and $SO_2$ gas in comparison of the other specimens. From this study, it was confirmed that organic materials such as core of commercial sandwich panel dischared much more noxious gas than specimens composed of cement and inorganic lightweight aggregate.

  • PDF

Design Optimization of Blast and Ballistic Impact Resistance Sandwich Panels Based on Kriging Approximate Models (크리깅 근사모델기반 복합충격 저항 샌드위치 패널 최적설계)

  • Jang, Sungwoo;Baik, Woon-Kyoung;Choi, Hae-Jin;Park, Soon Suk
    • Korean Journal of Computational Design and Engineering
    • /
    • v.20 no.4
    • /
    • pp.367-374
    • /
    • 2015
  • Sandwich panels consisting of various materials have widely been applied for mitigating dynamic impacts such as ballistic and blast impacts. Especially, the selection of materials for different core set-ups can directly influence its performance. In this study, we design the sandwich panels for alleviating ballistic and blast impacts by controlling the stacking sequence of core materials and their thicknesses. FEM studies are performed to simulate the dynamic behavior of sandwich panels subjected to ballistic and blast impacts. Delamination between the core layers is also considered in the FEM studies for feasible design. Based on the FEM data, kriging models are generated for approximating design space and quickly predicting the FEM outputs. Finally, design optimizations are implemented to find the optimum stacking sequence of core materials and thicknesses with given impact situations.

Properties of Sandwich Panel Using Cellular Concrete (기포콘크리트를 사용한 샌드위치 패널의 특성)

  • Jung, Yong-Wook;Jang, Seck-Soo;Lee, Seung-Han
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2006.11a
    • /
    • pp.845-848
    • /
    • 2006
  • This study sought to investigate the characteristics of cellular concrete, such as porosity, strength and density, according to the cell addition rate. Based on the result, it examined the application to a cellular concrete panel. Porosity was found to increase according to the cell addition rate, measuring continuous porosity of 42% and 47%, and total porosity of 61% and 66%. In terms of cell addition rate, measurements were 7% and 11% respectively. Compressive strength represented 5.0MPa, 3.8MPa and 2.8 MPa in terms of 7%, 9% and 11% respectively, decreasing 1 MPa of strength according to every 2% increase of cell addition rate. Density showed 0.55, 0.44 and 0.36 in terms of 7%, 9% and 11% respectively, decreasing 1.0 MPa according to every 2% increase of cell addition rate proportionally. In addition the sandwich panel of cellular concrete which was fabricated during this research was found to be relatively heavy and non-flammable with an excellent strength of 4.0 MPa. Compared with a light concrete panel, considering the compressive strength that accountsfor 10 MPa, it appeared relatively low in strength. However it would be excellent for application due to the light density of only 0.4 MPa.

  • PDF

Experimental Study to Estimate the Required Flow of Fire Extinguishing System for Flame Spread Prevention on Composite Panel (복합패널 화재확산 방지를 위한 소화시스템의 소요유량 산정을 위한 실험적 연구)

  • Park, Byoung-Jik;Shin, Hyun-Jun;Yoo, Yong-Ho;Park, Jin-Ouk;Kim, Hwi-Seong;Kim, Yang-Kyun
    • Fire Science and Engineering
    • /
    • v.31 no.6
    • /
    • pp.33-39
    • /
    • 2017
  • Composite panel refers to the particular plywood produced in a way of stacking the different kinds of material in sandwich form and adhering them using adhesives and is widely used as building material for its constructability and cost efficiency. But as the surface is finished with steel plate, fire extinguishing agent cannot reach to the core material because of such steel plate on surface which causes the difficulties in suppressing the fire as well as in fire-fighting activities due to collapse. This study, to deal with such problem, is intended to set the fire pipe in core material to prevent the fire from spreading and in a bid to achieve this using minimized fire water, water supply test device was fabricated to estimate the required water flow of fire extinguisher and consequently, optimal water flow (0.5 L/min) was determined through a full-scale fire test.

Analysis of the Wireless Communication Environment in the Narrowed Residential Space for the Fire fighting Operation (소방작전을 위한 협소거주 공간의 무선 통신 환경 분석)

  • Park, Hyun-Ju;Hong, Sang-Beom;Choi, Hyuk-Jo
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
    • /
    • v.10 no.3
    • /
    • pp.242-248
    • /
    • 2017
  • Recently, Population has been concentrated in cities due to rapid economic growth. As a result, urban buildings are becoming more dense, high-rise, and diversified. The shape of these urban buildings increases the risk of fire, accidents and crime. The narrow living space has the characteristic of the unchanged floor. In case of a fire, the living space of the narrow residence is large in the damage because the smoke diffusion rate is fast. The radio wave transmittance and transmission distance of wireless communication used in fire fighting operations vary depending on the type of building materials and buildings. Therefore, this paper analyzes the building materials and structural characteristics of the narrow residential space for efficient fire fighting operations. We have developed a communication environment solution for a narrow residential space for the optimal fire fighting operation through the measurement of the radio wave transmittance and the transmission distance of the wireless communication.

Survey on Chicken Housing Types in Different Farm Scale and Region (양계농가의 사육규모별, 지역별 계사 시설현황 분석)

  • Choi, H.C.;Kham, D.H.;Na, J.C.;Bang, H.T.;Yu, D.J.;Suh, O.S.;Song, J.I.;Jeon, B.S.;Jeon, J.H.;Yoo, Y.H.;Lee, S.C.;Kim, J.S.;Lee, D.H.
    • Journal of Animal Environmental Science
    • /
    • v.15 no.3
    • /
    • pp.189-198
    • /
    • 2009
  • This survey was conducted to investigate the situation of housing type in poultry farms in Korea. The number surveyed among the farm size over 30,000 heads was 1,965 farms. Poultry housing types of windowless, open sided, vinyl house type were 19.0, 47.7, 19.8%, respectively. Waterers of nipple, bell, and 8 feet trough used in smaller than 50,000 heads of poultry farm were 40.6, 11.3 and 42.8%, respectively. But the bigger farm in the farm size of over 100,000 heads used more nipple waterer. Feeders of disk, hopper and chain used in poultry farm were 54.5, 16.3, 15.8%, respectively. Manure collecting system of scraper and belt was 29.4, 71.5 %, respectively. Ventilation systems of natural ventilation, natural + mechanical ventilation, mechanical ventilation were 40.5, 39.8, 20.7%, respectively.

  • PDF

Analysis of Environment Factors in Pleurotus eryngii Cultivation House of Permanent Frame Type Structure (영구형 큰느타리버섯 재배사의 환경요인 분석)

  • Yoon Yong-Cheol;Suh Won-Myung;Lee In-Bok
    • Journal of Bio-Environment Control
    • /
    • v.15 no.2
    • /
    • pp.125-137
    • /
    • 2006
  • Pleurotus eryngii is one of the most promising mushrooms produced on the domestic farms. The quality as well as quantity of Eryngii is sensitively affected by micro climate factors such as temperature, relative humidity, $CO_2$ concentration, and light intensity. To safely produce high-quality Eryngii all the yew round, it is required that the environmental factors be carefully controlled by well designed structures equipped with various facilities and control systems. At the commercial mushroom cultivation houses of permanent frame type (A, B), this study was carried out to find out reasonable range of each environmental factor and yield together with economic and safe structures influencing on the optimal productivity of Eryngii. This experiment was conducted for about two-year ken Nov. 2003 to Dec. 2005 in cultivation house. Ambient temperature during the experiment period was not predominantly different from that of a normal year. The capacity of the hot water boiler and the piping systems were not enough. Because the capacity of electric heater and air circulation were not enough, air temperatures in cultivation house before improvement of system were maintained somewhat lower than setting temperature, and maximum air temperature difference between the upper and lower growth stage during a heating time period was about 5.1. But the air temperatures after system improvement were maintained within the limits range of setting temperature without happening stagnant of air. Air temperature distribution was generally distributed uniform. Relative humidity in cultivation house before , improvement was widely ranged about $44{\sim}100%$. But as the relative humidity after improvement was ranged approximately $80{\sim}100%$, it was maintained within the range of relative humidity recommended. And $CO_2$ concentration was maintained about $400{\sim}3,300mg{\cdot}L^{-1}$ range. The illuminance in cultivation house was widely distributed in accordance with position, and it was maintained lower than the recommended illuminance range $100{\sim}200lx$. The acidity of midium was some lower range than the recommend acidity range of pH $5.5{\sim}6.5$. The yield was relatively ununiform. In case of bottle capacity of 1,300cc, the mushroom of the lowest grade was less than 3%. The consumption electric energy was quite different according to the cultivation season. The electric energy consumed during heating season was much more than that of cooling season.

A Study on the New Type Rib of Steel Deck Plates (새로운 형태의 강바닥판 리브에 대한 연구)

  • Chu, Seok Beom;Park, Jong Hae
    • Journal of Korean Society of Steel Construction
    • /
    • v.26 no.6
    • /
    • pp.605-615
    • /
    • 2014
  • The purpose of this study is to propose an economic new type rib by applying plate stiffening methods of the corrugated plate and the honey-comb sandwich panel to the steel deck plate and comparing the new type rib with existing open and closed ribs. The trapezoidal corrugated type, ㄹ type, honey-comb type and ㅁ type ribs are considered as new type ribs and the moment and the steel volume are compared with that of open ribs and closed ribs. The results shows that the honey-comb type and ㅁ type ribs are good in aspects of economic feasibility and the ㅁ type is better than the honey-comb type. To make the ㅁ type rib applicable to the steel deck plate, the sensitivity analysis and parametric study are performed and the system to select the proper section under the particular stress condition is established. The closed rib of real bridges is compared with the ㅁ type rib of the proposed system and it is known that the new type rib is more economic. Therefore, more economic steel deck plates can be achieved by using the system proposed in this study for the plate stiffened with the new ㅁ type rib.

Collision Behaviors Analysis of Sandwich Concrete Panel for Outer Shell of LNG Tank (LNG외조를 구성하는 샌드위치 콘크리트 패널의 충돌거동해석)

  • Lee, Gye Hee
    • Journal of the Computational Structural Engineering Institute of Korea
    • /
    • v.30 no.6
    • /
    • pp.485-493
    • /
    • 2017
  • In this study, the collision analysis of SCP(Sandwich Concrete Panel) composing the outer tank of LNG storage was performed and its collision behavior was analyzed. For the same collision energy value proposed in BS7777 code, the collision conditions are composed by using two types of missiles and various collision speeds. Nonlinear dynamic analysis models were constructed to perform numerical analysis on the various collision conditions. Also, the collision behavior was analyzed assuming that the second collision with the same collision energy occurs at the same point after the first collision. As a result of the analysis, it was found that with smaller missile and low collision speed had caused larger deformation. The collision energy dissipated in ratio of about 6: 4 in the outer steel plate and the inner filling concrete. In the results of double collision analysis, the final collisional deformation was dominated by the size of the second missile, and the amount of deformation due to the second collision was smaller than that of the first collision because of the membrane behavior of the steel plates. In the offset double collision cases, the largest deformation occurs at the secondary collision point regardless of the offset distance.

A study on the design of air conditioning system in the mushroom cultivation greenhouse (버섯재배사의 공조시스템 설계에 대한 연구)

  • Ryu, Kyung-Jin;Son, Jae-Hwan;Han, Chang-Woo;Nah, Kyu-Dong
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.18 no.2
    • /
    • pp.743-750
    • /
    • 2017
  • It is important to ensure a uniform temperature distribution in greenhouses for the mushroom cultivation. The air temperature of the mushroom cultivation greenhouse is made uniform by supplying a constant air temperature with the underground air. The mushroom cultivation array in a greenhouse in seven columns and four rows can make smooth air flows between the rows and prevent air differences between the top and bottom. The buoyancy effect in the entering air of 0.5m/s based on following density difference depending on initial internal temperature needs to be considered. The locations of the Fan Coil Unit (FCU) and fan were defined through flow analysis in a greenhouse to distribute the optimal uniform temperature. In this study, the air conditioning system of a greenhouse with a sandwich heat insulting panel shape which is composed of a FCU and fan was designed by flow analysis. A relatively uniform temperature distribution can be formed because the circulation path of air becomes longer in the different locations of the FCU (inlet) and fan (outlet) through the internal temperature and flow analysis. The cultivation and quality uniformity of the mushrooms could be promoted through these environmental improvements.