• Title/Summary/Keyword: Horizontal type

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The analysis of dynamic behavior for horizontal drum type HRSG (Horizontal drum type HRSG(Heat Recovery Steam Generator)의 동특성 해석)

  • Lee, Chi-Hwan;Kim, Sung-Ho;Kim, Jong-Hyun
    • Proceedings of the KSME Conference
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    • 2000.11b
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    • pp.645-650
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    • 2000
  • This dynamic analysis is performed about shutdown, load controlled and temperature controlled startup operating characteristics of the Horizontal drum type HRSG. This analysis was performed by constructing a dynamic model of the plant and running it through the appropriate.

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Laminar Natural Convection Heat Transfer from an Isothermal Rectangular Beam Attached to Horizontal and Vertical Adiabatic Plates (수직 및 수평 단열판에 부착된 등온 사각비임에서의 자연대류 열전달)

  • 박재림;권순석
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.16 no.1
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    • pp.95-103
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    • 1992
  • Laminar natural convection heat transfer from an isothermal rectangular beam attached to horizontal and vertical adiabatic plates has been studied for various aspect ratios of the beam and Grashof numbers. The local Nusselt number was increased with decreasing H/B for the constant beam width, B, and with increasing H/B for the constant beam height, H. The total mean Nusselt number of the vertical type was higher than that of horizontal type in the range of H/B.leq.0.52, but reversed in the H/B>0.52 at constant beam width. The total mean Nusselt number of the horizontal type was generally higher than that of vertical type at constant beam height. The total mean Nusselt number of the vertical type was higher than that of horizontal type in the range of H/B.leq.0.43 at constant wetted perimeter, but reversed in the H/B$\leq$0.43.

Lateral Load Test for Various Aseismatic Methods of Pile Heads of Pier Type Quay Walls (잔교식 안벽의 말뚝 두부 내진 보강기법에 따른 수평재하실험)

  • 이용재;한진태;장인성;김명모
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 2003.09a
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    • pp.98-106
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    • 2003
  • To construct pile-supported wharf structures that must support heavy horizontal loads, both vertical piles and batter piles are used. Batter piles are used to secure the bearing capacity against the horizontal loads. However, past case histories have shown that the heads of batter piles are vulnerable because these heads are subjected to excessive axial loads during earthquakes. Therefore, the aseismatic reinforcement method must be developed to prevent batter pile heads from breaking due to excessive seismic loads. Two different connecting methods of either inserting rubber or ball-bearing between batter pile head and upper plate were proposed to improve the aseismatic efficiency. Three large-scale pile head models(rubber type model, ball-bearing type model, and fixed type model) were manufactured and horizontal loading tests were peformed for these models. The results showed that the force-displacement relationship of the fixed type model was linear, but that of the rubber type model and the ball-bearing type model was bilinear. The increase in the horizontal displacement led to the increase in the horizontal stiffness of the rubber type models and the decrease in that of the ball-bearing type model. Compared with the values for fixed type model, the damping ratios of the rubber type model and the ball-bearing type model increased about 33~185% and 263~269%, respectively.

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A Characteristics of Horizontal Swing Angle of Suspension Clamp in V type Suspension String Sets (V련 현수애자장치의 클램프 횡진 특성)

  • Sohn Hong-Kwan;Lee Hyung-Kwon;Min Byeong-Wook
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.54 no.3
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    • pp.133-138
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    • 2005
  • This paper presents a characteristics of horizontal swing angle in V type suspension string sets for 765kV T/L. The design of V type suspension string set does not differ from that of general string set for general towers, but it prevents instabilities from swing motion by the horizontal angle and by the wind pressure. We were designed specially 6 conductor yoke, arcing horn and earth horn. And we were decided to 550mm for a distance of strings. We were carried out characteristics of horizontal swing test and movement of mass center test for V-string sets of 400kN single, 300kN double and 400kN double. This products will be used for 765kV T/L of 1 circuit in suspension towers.

Prediction of Proper Horizontal Position of Work Roll in Backup Roll Driven-type Cold Rolling Mill (보강롤 구동 냉간압연기에서의 적정 작업롤 수평위치 설정기법 개발)

  • 변상민;이원호
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2003.05a
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    • pp.160-163
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    • 2003
  • For the purpose of rolling hard metals such as silicon steel and non-ferrous metals, the backup roll driven-type mill has been widely used in cold rolling industry. Since the backup roll drive results in horizontal bending of the work rolls and therefore exerted reciprocal action on the roll gap contour, the selection of slim work rolls is very restricted. In this paper, we present an analytic equation based scheme to determine a proper horizontal position of work roll minimizing the horizontal force subject to mechanical constraints.

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A Study on Heat Transfer Performance of Horizontal Ground Heat Exchanger (수평형 지중열교환기의 열전달 성능에 관한 연구)

  • Chung Minho;Park Seongryong;Ra Hosang;Baik Youngjin;Yoon Hyungkee;Chang Kichang
    • 한국신재생에너지학회:학술대회논문집
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    • 2005.06a
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    • pp.684-687
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    • 2005
  • Ground source heat pump systems are used for heating, ventilating and air-conditioning systems in commercial buildings, schools, and factories because of low operating and maintenance costs. These systems use the earth as a heat source in heating mode and a heat sink in cooling mode. Ground heat exchangers are classified by a horizontal type and vertical type according to the installation method. A horizontal type means that a heat exchanger is laid in the trench bored in 1.2 to 1.8 m depth. The solar heat and the rainwater are affected by the performance of heat exchanger and causes mutual influence among heat exchangers. In this study, to evaluate the performance of straight type, slinky type, and spiral type of horizontal ground heat exchangers designed on 1 RT scale, test sections are buried on the earth and experimental apparatus is installed. Therefore the performance of these is estimated.

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Development of High Peformance Geothermal heatexchanger (고성능저가형 지중열교환기 개발연구)

  • An, Hyung-Jun;Baek, Sung-Kwon;Im, Sung-Kyun
    • 한국신재생에너지학회:학술대회논문집
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    • 2007.06a
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    • pp.470-473
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    • 2007
  • Geothermal heat exchanger(GHEX) is a major component of Geothermal heat pump system(GSHPs). In Common, We use the vertical type GHEX in Korea. But vertical type GHEX needs a high cost for installation, because of drilling the hole which has 200m depth at max. So, We suggest the use of horizontal type GHEX. When we construct buildins, We excavate the ground and we can install the horizontal type GHEX at the excavated underground. It's very cheap and convenient method compare to vertical type GHEX installation. This study is peformed to estimate the peformance of horizontal type GHEX and to analyze effects of heat exchanger types and undergroundwater. As the result, slinky type GHEX has a 66% efficiency compare to vertical type GHEX and mat type has a 201% efficiency at the undergroundwater zone.

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Engineering Characteristics of Horizontal Drainage for Stabilization of Dredged Fill (준설매립지반의 안정처리를 위한 수평배수재의 공학적 특성)

  • 이상호;박정용;장연수;박정순;김수삼
    • Proceedings of the Korean Geotechical Society Conference
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    • 2001.03a
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    • pp.563-570
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    • 2001
  • In this study, the charactersistics of horizontal drains used to stabilize the dredged fill are investigated experimentally by doing tensile strength test, discharge capacity test, and filter clogging test. The types of the drains selected for the study are filament type (Tyre-E), embossed type(Type-P) and heat bonded cubic type with the thickness 10mm(Type-010) and 5mm(Type-05). The results of tensile strength and discharge capacity test show that the performance of drain Type-O10 was better than the other drains. This is caused by the fact that the lattice shape core of drain Type-O10 has strong rigidity and minimizes the loss of the sectional area of discharge with increased confining pressure. Analyzing the compatibility of filters by the results of the strength characteristics test and clogging test, the filter of filament type drain produced with polyester clothed polyamide performed well.

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Development and Evaluation of the Attrition Coupled Bioreactors for Enzymatic Hydrolysis of Biomass ; Horizontal Paddle Type Bioreactor for Enzymatic Hydrolysis of Cellulose (Biomass의 고효율 효소당화에 적합한 Attrition Coupled Bioreactor 개발에 관한 연구;Horizontal Paddle Type Bioreactor를 활용한 섬유소 당화)

  • 이용현;박진서
    • KSBB Journal
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    • v.4 no.3
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    • pp.215-220
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    • 1989
  • To develop an attrition coupled enzyme reactor with high efficiency-low energy consumption for saccharification of insoluble biomass, a 5L horizontal paddle type bioreactor was constructed and its performance was evaluated. The optimal condition for saccharification of 50g $\alpha$ -cellulose/L was found to be 200rpm with 500g of 3mm glass bead. Especially, the horizontal paddle type bloreactor was very effective for saccharification of high concentration of insoluble cellulose, in which around 72% of $\alpha$ -cellulose was saccharified for 75g $\alpha$ -cellulose/L, and even up to 70% for 100g of $\alpha$ -cellulose/L after 24hours. Under the optimal condition, the power consumption was measured to be around 1.7watth/g. Horizontal paddle type bioreactor seems to have an appropriated structural feature for industrial scale operation and to be an effective and energy saving attrition coupled enzyme reactor.

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An Effect of Heat Input on Thermal Storage for Horizontal Thermal Storage Tank with Heat pipe (열 파이프용 수평 축열조에서의 열 입력이 축열에 미치는 영향)

  • 최우석;박이동;김철주;황영규
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • 1995.05a
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    • pp.69-76
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    • 1995
  • The horizontal thermal storage tank with heat pipe which is suitable for the sensible heat storage system is able to store a hot water from the heat source such as heating pad efficiently and to supply a hot water to load rapidly. Therefore Arrangement of heating pad affects thermal flow and thermal storage efficiency. So, if effective arrangement is decided for condition of constant number of heating pad, the more rapid thermal flow effect and higher thermal storage efficiency is obtainable by active heat transfer. In this experiments, number of heating pad is ranged from three, five and nine, and when number of heating pad is constant, arrangement are two types of concentration-type and dispersion-type. As a result, for the case of concentration-type of heating pad, strong entrainment take place in horizontal thermal storage tank with heat pipe by active heat transfer and in the constant number of heating pad, the concentration-type has the higher efficiency with about 5∼6% than the dispersion-type. Therefore, when heating pad is equipted to horizontal thermal storage tank with heat pipe, concentration-type of heating pad is an efficient design in constant number. of heating pad.

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