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  • Title/Summary/Keyword: heating control system

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A Study on Plastic Injection Molding of a Metallic Resin Pigment using a Rapid Heating and Cooling System (급속가열냉각장치에 의한 금속성 안료 사출성형)

  • Lee, Gyu-Sang;Jin, Dong-Hyun;Kwak, Jae-Seob
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.14 no.2
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    • pp.87-92
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    • 2015
  • The injection molding process is widely used in the production of most plastic products. In order to make metal-colored plastic products like those found in modern luxury home alliances, metallic pigments are mixed with a basic resin material for injection molding. However, process control for metal-colored plastic products is extremely difficult due to the non-uniform melt flow of the metallic resin pigments. In this study, the effect of process parameters on the quality of a metal-colored plastic product is evaluated. A rapid mold cooling method using a compressed cryogenic fluid is also proposed to decrease the content of undesired compounds within the plastic product.

Curing Kinetics of the No-Flow Underfill Encapsulant

  • Jung, Hye-Wook;Han, Sang-Gyun;Kim, Min-Young;Kim, Won-Ho
    • Proceedings of the International Microelectronics And Packaging Society Conference
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    • 2001.11a
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    • pp.134-137
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    • 2001
  • The cure kinetics of a cycloalipatic epoxy / anhydride / Co(II) system for a no-flow underfill encapsulant, has been studied by using a differential scanning calorimetry(DSC) under isothermal and dynamic conditions over the temperature range of 160C 220C. The kinetic analysis was carried out by fitting dynamic/isothermal heating experimental data to the kinetic expressions to determine the reaction parameters, such as order of reaction and reaction constants. Diffusion-controlled reaction has been observed as the cure conversion increases and successfully analyzed by incorporating the diffusion control term into the rate equation. The prediction of reaction rates by the model equation corresponded well to experimental data at all temperature.

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A Study on High Frequency Inverter using E-Class Swithing Control (E급 스위칭 제어형 고주파 인버어터에 관한 연구)

  • Ro, Chae-Cyun;Nam, Seung-Sig;Sim, Kwang-Yeol;Moon, Chang-Su
    • Proceedings of the KIEE Conference
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    • 1991.07a
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    • pp.537-540
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    • 1991
  • This paper discusses with a voltage - fed Type high frequency inverter with simple main circuit and high efficiency. The proposed inverter is proper as a high frequency inverter of home applications applied with induction healing principle of high frequency. Further, its operating characteristics necessary to its design is estimated by analysis of a lumped circuit of heating system as a model.

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Development of LED Traffic Light Lens with snow removing function (제설 기능을 갖는 LED 신호등 렌즈 개발)

  • Lee, Dongeun;Seol, Dongyoul
    • Journal of Korea Society of Digital Industry and Information Management
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    • v.13 no.4
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    • pp.41-48
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    • 2017
  • It is necessary to develop an LED traffic light lens having a snow removal function capable of clearly providing a traffic signal to the driver even when a traffic light is blurred due to heavy snow and wind in the winter season. This study is focused on the research and development of the traffic light lens in the process of developing the LED traffic light with the snow removal function. In the developed traffic light lens, instead of attaching the film heater, the coated nichrome wire was wound into a coil shape and inserted directly into the groove in the lens. The developed heater system facilitates the insertion of the heating wire with high elasticity into a curved lens and can provide a sufficient heat without deformation of the PC lens. The proposed traffic lights were tested in various external environments and the test results showed that complete snow removal is possible without tunnel effect.

THEORITICALL ANALYSIS OF TEMPERATURE DISTRIBUTION IN TWO-DIMENSIONAL FIELD USING F.E.M (유한요소법을 이용한 2차원 Field 내의 온도분포의 이론적 해석)

  • Kim, N.H.;Choi, C.S.;Choi, H.H.;Hong, S.H.
    • Proceedings of the KIEE Conference
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    • 1987.07b
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    • pp.1292-1295
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    • 1987
  • In noninvasive temperature measurement within body, this paper is presented temperature measurement method in security and with effect from Applicator by electromagnetic, and it is analyzed heat generation quantity or temperature rise distribution by computer simulation within body. In this paper, two-dimensional model is considered and temperature distribution produced by RF capacitive heating system is analyzed by using Finit Element Method (F.E.M). A passibility of temperature distribution control is examined based on the position and size of Applicator.

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Thermal Performance Evaluation of The Window Film Insulation for Building Energy Savings (건물에너지 절감을 위한 열차단 필름의 성능 평가)

  • Nam, Jung-Woo;Won, Jong-Seo
    • 한국태양에너지학회:학술대회논문집
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    • 2008.11a
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    • pp.75-80
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    • 2008
  • Recently, Energy savings in buildings has received much attention in response to the increased needs for global warming and better comforts of the occupants in apartment housing. This study proposes the method which uses the sun control window film to reduce the cooling load and heating load improving the thermal performance of the building and it improves an energy efficiency. The film which used in actual measurement has a low shading coefficient and a solar energy transmission. so we measured the surface temperature of the triple Low-e glazing system used and inside temperature according to the change of outside temperature and solar energy to study thermal performance evaluation. As a result, it was helpful to use window film insulation to reduce inside temperature in summer and to keep room warm in winter.

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Analysis of energy consumption of office building by thermal resistance-capacitance method (열저항-열용량법에 의한 사무실용 건물의 소비에너지 해석)

  • Lee, C.S.;Choi, Y.D.
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.9 no.1
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    • pp.1-13
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    • 1997
  • This paper reports the dynamic analysis of energy consumption for an office building by heat resistance-capacitance method. If a building is divided into several wall components and the wall components is replaced by one thermal capacitance and several thermal resistances, the building becomes an electric circuit. By solving the simultaneous equations of the circuit, the dynamic heat transfer characteristics and the energy consumption rate of the building were predicted. Accuracy of modified BIN method was evaluated by the present resistance-capacitance method. The result shows that modified BIN method overpredicts the heating load of the office building 15%. Annual energy consumptions of equipments(fan, boiler, chiller) for various ventilating control system(CAV, VAV, FCU+VAV, FCU+CAV) were compared. FCU+CAV shows the minimum annual energy consumption.

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Control of surface defects on plasma-MIG hybrid welds in cryogenic aluminum alloys

  • Lee, Hee-Keun;Chun, Kwang-San;Park, Sang-Hyeon;Kang, Chung-Yun
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.7 no.4
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    • pp.770-783
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    • 2015
  • Lately, high production rate welding processes for Al alloys, which are used as LNG FPSO cargo containment system material, have been developed to overcome the limit of installation and high rework rates. In particular, plasma-metal inert gas (MIG) hybrid (PMH) welding can be used to obtain a higher deposition rate and lower porosity, while facilitating a cleaning effect by preheating and post heating the wire and the base metal. However, an asymmetric undercut and a black-colored deposit are created on the surface of PMH weld in Al alloys. For controlling the surface defect formation, the wire feeding speed and nozzle diameter in the PMH weld was investigated through arc phenomena with high-speed imaging and metallurgical analysis.

A Direct Single-phase Quasi-resonant AC-AC Converter with Zero Voltage Switching

  • Antchev, Mihail Hristov
    • Journal of Power Electronics
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    • v.17 no.4
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    • pp.860-873
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    • 2017
  • The present article reports an analysis and investigation of a direct AC-AC quasi-resonant converter. A bidirectional power device, whose switching frequency is lower than the frequency of the current passing through the load, is used for its realization. The zero voltage switching mode is described when zero voltage on the power device is available by measuring it with the control system. The continuous current in the resonant inductance by switching the power device at zero voltage is considered, and it is characterized by two sub-modes. A mathematical analysis of the processes has been made and comparative results from the computer simulation and experimental study have been brought. The converter can be used in a wide areas of power electronics: induction heating, wireless power transfer, AC-DC converters, etc.

An Experiment on Performance Evaluation of a Vapor Condensation Type Air Washer System for Semiconductor Clean Rooms (반도체 클린룸용 수증기 응축식 에어와셔 시스템의 성능평가)

  • Yeo, Kuk-Hyun;Park, Sang-Tae;Yoo, Kyung-Hoon;Son, Seung-Woo
    • Proceedings of the SAREK Conference
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    • 2006.06a
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    • pp.442-447
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    • 2006
  • In semiconductor manufacturing clean rooms, it becomes important to remove airborne molecular contaminants as well as particulate contaminant in outdoor air introduced into clean rooms. One suitable control technique for these chemical contaminants is air washing by water in an outdoor air handling unit. In order to enhance the removal efficiency of chemical contaminants the effect of adding a heating and humidifying process before an air washer was examined.

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