• Title/Summary/Keyword: Electrical heating

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Three-Dimensional Analysis of Induction Heating Roll (교류 유도가열의 특성해석)

  • Jang, S.M.;Jin, S.K.;Cho, S.K.;Park, H.C.
    • Proceedings of the KIEE Conference
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    • 2002.04a
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    • pp.71-73
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    • 2002
  • The Induction heating is used in various industry and ever-increasing number of applications. The heating roll, which is a kind of induction heating, widely used in curing of coatings and fiber industry. In this papaer, we analized thermal characteristic of induction heating roll by three dimensional eddy-current analysis. Using this analytic results, We could predict the thermal distribution of induction heating roll.

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Optimal Operation Model of Heat Trade based District Heating and Cooling System Considering Start-up Characteristic of Combined Cycle Generation (가스터빈 복합발전의 기동특성을 고려한 열거래 기반 지역 냉난방 시스템의 최적 운영 모델)

  • Kim, Jong-Woo;Lee, Ji-Hye;Kim, Hak-Man
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.11
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    • pp.1610-1616
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    • 2013
  • Recently, district heating and cooling (DHC) systems based on combined cycle generation (CCG) providers are increasing in Korea. Since characteristics of combined heat and power (CHP) generators and heat demands of providers, heat trading between DHC providers based on the economic viewpoint is required; the heat trading has been doing. In this paper, a mathematical model for optimal operation based on heat trading between DHC providers is proposed. Especially, start-up characteristic of CCG is included. The operation model is established by mixed integer linear programming (MILP).

The Optimal Design and Leakage Flux Analysis of the Induction Heating Cooker (유도가열조리기의 최적설계 및 누설자속 해석)

  • Byun, Jin-Kyu;Park, Il-Han;Choi, Kyung;Jung, Hyun-Kyo;Hahn, Song-Yop;Roh, Hee-Succ;Kwon, Kyoung-An;Yang, Woo-Jong
    • Proceedings of the KIEE Conference
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    • 1996.07a
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    • pp.157-159
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    • 1996
  • For the optimal design of the induction heating cooker, precise and accurate analysis of the magnetic field inside the jar must be achieved first. Until now, design methods based on experience has been used in industry field. But this takes a lot of trial and error, high cost and also long development time. So the analysis of the magnetic field distribution is very important. In this paper the magnetic field inside the induction heating cooker is analyzed by using axisymmetrical FEM(finite element method). And the method of the coil location design for the optimal heat source distribution using sensitivity analysis is developed. In addition, the shielding effect of the non-axisymmetrical 3-D ferrite structure used in induction heating cooker is also analyzed by the integral method.

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Fire Cause Analysis of Local Heating on Carbon Type Hot Wire Electric Pad (카본열선을 사용하는 전기장판의 국부가열에 의한 화재원인 분석)

  • Song, Jae-Yong;Kim, Jin-Pyo;Nam, Jung-Woo;Sa, Seung-Hun
    • Fire Science and Engineering
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    • v.24 no.4
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    • pp.104-108
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    • 2010
  • This paper describes electrical fire on electric pad using carbon type hot wires. A carbon type hot wires electric pad is virtually impossible to connect hot wire as a method of electrical welding or soldering. In order to connect between hot wires, that has to splice carbon type material connector. If junction of hot wires was occurrence of poor connection on electric pad, it increase contact resistance on this junction point. With increasing contact resistance, junction of hot wires on electric pad generates local heating and finally leads to electrical fire. In this paper, we analyzed shape of damage in hot wires caused by electrical local heating and investigated fire cause on electric pad using by carbon type hot wires.

Fabrication of a polymerase chain reaction micro-reactor using infrared heating

  • Im, Ki-Sik;Eun, Duk-Soo;Kong, Seong-Ho;Shin, Jang-Kyoo;Lee, Jong-Hyun
    • Journal of Sensor Science and Technology
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    • v.14 no.5
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    • pp.337-342
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    • 2005
  • A silicon-based micro-reactor to amplify small amount of deoxyribonucleic acid (DNA) has been fabricated using micro-electro-mechanical systems (MEMS) technology. Polymerase chain reaction (PCR) of DNA requires a precise and rapid temperature control. A Pt sensor is integrated directly in the chamber for real-time temperature measurement and an infrared lamp is used as external heating source for non-contact and rapid heating. In addition to the real-time temperature sensing, PCR needs a rapid thermocycling for effective PCR. For a fast thermal response, the thermal mass of the reactor chamber is minimized by removal of bulk silicon volume around the reactor using double-side KOH etching. The transparent optical property of silicon in the infrared wavelength range provides an efficient absorption of thermal energy into the reacting sample without being absorbed by silicon reactor chamber. It is confirmed that the fabricated micro-reactor could be heated up in less than 30 sec to the denaturation temperature by the external infrared lamp and cooled down in 30 sec to the annealing temperature by passive cooling.

Characteristics of Plasma Sprayed TiO2-NiCr Conductive Heating Roll Coatings (가열 롤에서 플라즈마 TiO2-NiCr 용사피막의 특성)

  • Kang, Tae-Gu;Jin, Min-Seok;Ko, Young-Bong;Kim, Tae-Hyung;Cho, Sang-Hum;Park, Jung-Sik;Kim, Jong-Chul;Park, Kyeung-Chae
    • Journal of Welding and Joining
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    • v.25 no.4
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    • pp.28-34
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    • 2007
  • The heating unit of direct heating method manufactured as the plasma spray coating of $TiO_2/NiCr$ conductive heating material on the surface of heating unit in order to improve the disadvantages of indirect heating method. $TiO_2$ and NiCr (80wt.%Ni-20wt.%Cr) that had the properties of conduction and heating was chosen for the conductive heating material. The compositions of the composite powders were studied $TiO_2-30wt.%NiCr\;and\;TiO_2-10wt.%NiCr$. As the heating temperature was increased, the hardness of heating layer was increased because of the fine microstructure and the decrease of porosity. The adhesion strength was decreased for coarsening and connection of voids in the insulation layer, and the electrical resistivity of heating layer was increased for fine crack formation and growth. In this study, the best efficient sprayed coatings with heating unit was concluded as the plasma sprayed $TiO_2-10wt.%NiCr$ coatings that was heat treated at $300^{\circ}C$.

Design of High Frequency Inverter with Series-parallel Load-Resonant for Induction Heating application (유도가열기용 직.병렬 공진 고주파 인버터의 설계)

  • 홍순일;손의식
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.14 no.6
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    • pp.12-17
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    • 2000
  • IN induction heating system the high frequency operation allows a rapid response to current fluctuation in the inverter and result in improved welding quality. To work induction heating of nonferrous metals, a welding power supply is need high working frequency and high power. This paper is shown design technique for increasing working frequency in induction heating for welding coppers. A series-parallel resonate inverter consists of H-type bridges, each of whose arms is composed of a combination of two parallel IGBTs. Inverter operating with the fixed frequency is controlled by pulse width modulation (PWM). As switching adapted the Zero-Voltage Switching technique to reduce switching losses the system is high efficiency. The propose inverter has feature which is high efficiency for very wide load variations with a narrow range of duty cycle ratio control and load short circuit capability. Detailed experimental results obtained from a 48[V] output, 500[W] experimental inverter are presented to verify the concept.

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A Study on the Thermal and Electrical Characteristics with Manufacture of the Heating Element by Using Carbon with Bar Type (봉상 카본 발열체의 제조와 열 및 전기적 특성에 관한 연구)

  • 배강열;이광성;정한식;정희택;정효민
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.16 no.5
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    • pp.430-437
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    • 2004
  • This paper is intended as an investigation of study on the thermal and electrical characteristics of the carbon heating element. In this experimentation, the electric material used is the crystalline graphite a kind of natural graphite. The bentonite is used to solidify the heating element and the vacuum furnace is used for sintering it. It is noted that the natural drying time should be at least 58 hours. The plating of the electric pole with the electroless nickel showed the lowest contact resistance among others. The resistance shows linear variation with regard to length. For the insulation and resolution, the glaze coating is best with 80% of water content. The temperature rising characteristic of the heating element is better than sheath heater saving 43% of rising time. The correlation equation for temperature was obtained with the electric power.

Joule Heating of Metallic Nanowire Random Network for Transparent Heater Applications

  • Pichitpajongkit, Aekachan;Eom, Hyeonjin;Park, Inkyu
    • Journal of Sensor Science and Technology
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    • v.29 no.4
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    • pp.227-231
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    • 2020
  • Silver nanowire random networks are promising candidates for replacing indium tin oxide (ITO) as transparent and conductive electrodes. They can also be used as transparent heating films with self-cleaning and defogging properties. By virtue of the Joule heating effect, silver nanowire random networks can be heated when voltage bias is applied; however, they are unsuitable for long-term use. In this work, we study the Joule heating of silver nanowire random networks embedded in polymers. Silver nanowire random networks embedded in polymers exhibit breakdown under the application of electric current. Their surface morphological changes indicate that nanoparticle formation may be the main cause of this electrical breakdown. Numerical analyses are used to investigate the temperatures of the silver nanowire and substrate.

A Study on the Induction Heating for Aluminum Sheet Using High-Frequency Resonant Inverter) (고주파 공진형 인버터를 이용한 알루미늄 박판가열에 관한 연구)

  • Shin, Dae-Chul;Kim, Sung-Ho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.18 no.3
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    • pp.90-94
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    • 2004
  • In this treatise, The "Induction-Heating" and "The Skin Effect" which resulted from the High-Frequency using the High-Frequency Resonant Inverter are showed by this paper. It would research into "The Electro-magnetic Induction" and "The skin Effect" with an aluminum which is the typical paramagenetic metal. Ultimately, it was focused on the possibility of the heating for an aluminum sheet and draw up its practical use-plan.