• Title/Summary/Keyword: heating element

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A Study on Adsorption of Volatile Organic Compound by Activated Carbon Fiber Coated with Dielectric Heating Element and Desorption by Applying Microwave (유전가열물질을 코팅한 활성탄소섬유의 휘발성 유기화합물 흡착 및 마이크로파 인가에 의한 탈착 연구)

  • Kim, Sang-Guk;Chang, Ye-Rim
    • Journal of Korean Society for Atmospheric Environment
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    • v.25 no.2
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    • pp.122-132
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    • 2009
  • Adsorption of toluene by activated carbon fiber (ACF) coated with dielectric heating element and desorption by applying microwave were investigated. In order to prepare adsorbent so that VOC can be desorbed by microwave heating, fine dielectric heating element with nano size was coated on the surface of the ACF using hybrid binder. Eight adsorbents (ACF-DHE, Activated Carbon Fiber coated with Dielectric Heating Element) were prepared with different amount of dielectric heating element, kinds of hybrid binder, and solvent. In order to investigate adsorption characteristics, BET surface area, pore volume, and average pore size were measured for each adsorbent including ACF. Breakthrough experiments with toluene concentration, flow rate, bed length using fixed bed reactor were performed to investigate adsorbality of adsorbent, and results were compared with that of the ACF. Desorption reactor was constructed with modified microwave oven to investigate heating effect on ACF-DHE by applying microwave power. Each adsorbent saturated with toluene were put into desorption reactor. Composition of desorbed gas generated by applying controlled microwave power to reactor was measured. Up to now, hot air desorption method has been used. Experimental results showed that desorption method with new adsorbent prepared by coating dielectric heating element on ACF can be used for industrial application.

Image Processing Technology for Analyzing the Heating State of Carbon Fiber Surface Heating Element (탄소섬유 면상발열체의 발열 상태 분석을 위한 영상처리 기술)

  • Cho, Joon-Ho;Hwang, Hyung-Soo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.2
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    • pp.683-688
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    • 2018
  • In this study, we analyzed the heat generation state of a flat heating element by using image processing technology in conjunction with carbon fiber. The flat heating element is manufactured by chopping the carbon fiber to a small size and bonding it again using a dispersing agent. The solution of carbon fiber, bound together using the dispersant, is then filtered onto the nonwoven fabric. The last step is to obtain flat carbon fibers in the form of nonwoven fabrics for the purpose of drying the filtered carbon fibers. In the flat heating element, electricity may be applied to the carbon fiber on the surface produced in this manner. In this study, the flat heating element was analyzed by four methods. The analysis of the heat generation characteristics and heating rate of the flat heating element confirmed that the fabricated sheet heating element corresponds to a normal army. The analysis of the insulation coating and flat heating element module, which can be used for actual product manufacturing, involves two dimensional image analysis using image processing technology. The thermal image analysis of the flat heating element is a programming technique that not only analyzes the heat generation state in both two and three dimensions, but also displays the upper and lower 15 to 20% ranges of temperature corresponding to the heat generation in the image. In the final analysis, it is possible to easily find the erroneous part in the manufacturing process by directly showing the state of the fabricated flat heating element on the screen. By combining this image analysis method of the flat heating element with the existing method, we were able to more accurately analyze the heat generation state.

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.

Electrical Properties of Carbon Black Composites for Flexible Fiber Heating Element (유연한 섬유상 발열체용 카본블랙 복합소재의 전기적 특성)

  • Park, Ji-Yong;Lee, Jong-Dae
    • Journal of the Korean Applied Science and Technology
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    • v.32 no.3
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    • pp.405-411
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    • 2015
  • Carbon composites for flexible fiber heating element were examined to improve the electrical conductivity in this study. Carbon composites using carbon black, denka black, super-c, super-p with/without CNF or dispersant such as BCS03 and Sikament-nn were prepared. Carbon composite slurry was coated on plane film and yarns(cotton, polyester) and the performances of prepared heating materials were investigated by checking electrical surface resistance, adhesion strength. The plane heating element using carbon black under natural drying condition($25^{\circ}C$) had better physical properties such as surface resistance(185.3 Ohm/sq) and adhesion strength(above 90%) than those of other carbon composite heating elements. From these results, polyester heating element coated by carbon black showed better electrical line resistance(33.2 kOhm/cm) than cotton heating element. Then, it was found that polyester heating element coated by carbon black with CNF(3 wt%) and BCS03(1 wt%) appeared best properties(0.604 kOhm/cm).

Preparation and Characterization of Heating Element for Inkjet Printer (잉크젯 프린터용 발열체의 제작과 특성연구)

  • 장호정;노영규
    • Journal of the Microelectronics and Packaging Society
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    • v.10 no.3
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    • pp.1-7
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    • 2003
  • The crystallized stable cobalt silicide$(CoSi_2)$ films were prepared on $poly-Si/SiO_2/Si$substrates for the application of inkjet printing head as a heating element with omega shape. The structural images and temperature resistance coefficient were investigated. The value of temperature resistance coefficient of the heating element was found to be about $0.0014/^{\circ}C$. The maximum power of the heating element was 2 W at the applied voltage of 2 V, 10 kHz in frequency and $1{\mu}s$ in pulse width. From the investigation of fatigue property according to the repeated applied voltages, there was no drastic changes in the resistances of heating element under the condition of $10^8$ pulsed cycles at below 15 V biased voltage. In contrast, the resistance of heating element was greatly increased at $10^6$ pulsed cycles when the heating element was operated at 17 V.

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A Study on Thermal Characteristics of Carbon-Organic Surface Heating Element with Electrodeless Lamp of a Freezer (냉동고 무전극램프 적용 탄소-유기소재 면상발열체의 열 특성에 관한 연구)

  • Lee, Min-Sang;Back, Seong-Hun;Kang, Sung-Soo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.19 no.1
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    • pp.1-10
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    • 2020
  • This study deals with the fabrication and thermal characterization of planar heating elements attached to the backside of the reflector used in the electrodeless lamp of a freezer. We tried to solve the problem of the local heat generation of the linear heating element that occurs about 50℃. The homogeneous dispersion and manufacturing excellence of the planar heating element produced were confirmed through SEM and EDS. In addition, the test specimens was prepared according to the change in the ratio of carbon fiber to the basis weight of the planar heating element, and a sample having a basis weight of 50g/㎡ having a content ratio of carbon fiber of 70% was selected. That sample showed low surface resistance of 4.3Ω/sq and high temperature of about 81℃ at 6V. Durability was confirmed by performing repeated bending evaluation of 3000 cycles for the sample. Large area test specimens were prepared to be applied to the actual reflector, insulated by EVA film and analyzed for their thermal characteristics. From 13V application, the temperature of the linear heating element was higher than 50℃ and the average temperature of 68℃ was maximum at 18V.

Design for Adhesive Carbon Heating Element X-ray Table with an Attached Heating Device (가열장치를 구비한 부착형 탄소발열체 X선 촬영대 고안)

  • Song, Jongnam;Kim, Eungkon
    • Journal of the Korean Society of Radiology
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    • v.9 no.3
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    • pp.131-137
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    • 2015
  • The purpose of this study is to warm up the conventional X-ray table by inventing and design for X-ray table with an attached heating device using less unloaded X-ray, CNT (carbon nano tube) heating element. Configuration of the product design for adhesive carbon heating element X-ray is composed of a conventional X-ray table, carbon nano tube planar heating element, an electrode line, flame resisting protective film, and the bottom film. Characteristics and advantages of this invented product is to provide gentle feeling, the sense of security, and eliminating anxiety to the patient wearing a patient gown and feel the cool air while receiving the test. Thus we are strongly recommend to use this device in the clinical situation.

Hot Wire Wind Speed Sensor System Without Ambient Temperature Compensation (주변 온도보상이 필요 없는 열선식 풍속 센서 시스템)

  • Sung, Junkyu;Lee, Keunwoo;Jung, Hoekyung
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.23 no.10
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    • pp.1188-1194
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    • 2019
  • Among the many ways to measure the flow of fluid the hot air wind speed sensor is a device for measuring the speed or temperature by heat transfer of a fluid. However, the hot wire wind speed sensor is sensitive to external environmental factors, and has a disadvantage of inaccuracy due to ambient temperature, humidity, and signal noise. In order to compensate for this disadvantage, advanced technology has been introduced by adding temperature compensation circuits, but it is expensive. In order to solve this problem, this paper studies the wind speed sensor that does not need temperature compensation. Heated wind speed sensors are very vulnerable to the ambient temperature, which is generated by electronic circuits, even among external environmental factors. in order to improve this, the auxiliary heating element is additionally installed in the heating element to control a constant temperature difference between the auxiliary heating element and the heating element.

Conductive Polypyrrole/Polyester Composite Fabrics for Heating Element (발열체용 전도성 polypyrrole/polyester 섬유복합체)

  • Lee, Eung;Lee, Jong-Hyeok;Kim, Young-Ho;Kim, Eun-Ok
    • Textile Science and Engineering
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    • v.47 no.5
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    • pp.345-351
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    • 2010
  • A conducting polymer, polypyrrole (PPy) doped with antraquinone sulphonic acid (AQSA), was coated chemically onto polyester (PES) fabrics. PPy was then deposited in sequence on the conducting fabrics (PES covered with PPy/AQSA) by constant-current electrolysis. Electrochemical polymerization (EP) was carried out for different electrolysis times. The weight percent gain, thickness, electrical conductivity and maximum temperature of the PPy-PES increased with the electrolysis time. The structural changes accompanied were examined by SEM and FT-IR. The electrical conductivity ranged from 1.5 to 6.5 S/cm. When a fixed voltage was applied to the PPy-PES, the maximum temperature was increased by more than $90^{\circ}C$. Such conducting PPy-PES fabrics can be used for flexible heating element by 6.0 V DC.

Experimental Study on Internal Temperature Change Induced by Heating Element Attached to Tunnel Lining Surface (터널 라이닝 표면에 부착된 발열체로 인한 내부 온도 변화의 실험적 연구)

  • Jin, Hyunwoo;Hwang, Youngcheol
    • Journal of the Korean GEO-environmental Society
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    • v.18 no.11
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    • pp.35-40
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    • 2017
  • The rearside of concrete lining of tunnels constructed in cold region might experience on freezing due to the low temperature. This causes damage of concrete lining resulting in adverse affect on the durability as well as integrity of tunnel structure by causing damage to the concrete lining. In order to prevent the rearside of tunnel lining from freeing, the temperature change inside the concrete lining was measured by attaching a heating element to the tunnel lining surface and generating heat for a certain period of time. A special freezing chamber was developed to conduct the experiments considering in-situ environment. The carbone nanotube (CNT) was used as a heating element in this study. The temperature distribution of the concrete lining was measured by applying the heat to the heating element. The effect of the outside temperature and heating duration were analyzed.