• Title/Summary/Keyword: Electrical heating

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Electrical and Resistance Heating Properties of Carbon Fiber Heating Element for Car Seat (자동차 시트용 탄소섬유 발열체의 전기적 및 저항 발열 특성)

  • Choi, Kyeong-Eun;Park, Chan-Hee;Seo, Min-Kang
    • Applied Chemistry for Engineering
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    • v.27 no.2
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    • pp.210-216
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    • 2016
  • In this paper, the electrical and resistance heating properties of carbon fiber heating elements with different electroless Ni-P plating times for car seat were studied. The specific resistance and specific heat of the carbon fibers were determined using 4-point probe method and differential scanning calorimetry (DSC), respectively. The surface morphology and temperature of carbon fibers were measured by scanning electron microscope (SEM) and thermo-graphic camera, respectively. From experimental results, the nickel layer thickness and surface temperature of carbon fibers increased with increasing the plating time. However, the specific heat and specific resistance decreased with respect to the increased plating time. In conclusion, the electroless Ni-P plating could improve the resistance heating and electrical properties of carbon fiber heating elements for car seat.

Study of Fire Appraisal Method According to Electrical Fire Hazards of Hair Dryer (모발건조기의 전기화재 위험요소에 따른 화재 감정기법 연구)

  • Moon, Hyun-Wook;Lee, Ki-Yeon;Kim, Dong-Woo;Gil, Hyung-Jun;Kim, Hyang-Kon
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.25 no.12
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    • pp.113-118
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    • 2011
  • In this study, investigation and appraisal method for the scene of a fire according to electrical fire hazards of hair dryer which is usually used at living space are presented. Hair dryer is briefly composed of heating part, wind part and control part. Electrical fire hazards of hair dryer are insulation destruction of power cord, ignition by overheat of heating coil, scattering spark on inside dust, overheat of motor by fan shackle, ignition by carelessness of user, and so on. Fire cause by hair dryer can be perceived through investigation about half-disconnection of power cord, contact badness of power plug, verification of heating coil, fan and switch. These results are expected to be utilized effectively in a countermeasure to prevent an electrical fire by hair dryer.

The Heating Performance Evaluation of Heating System with Building-Integrated Photovoltaic/Thermal Collectors (실험을 통한 건물통합형 태양광·열(BIPVT) 시스템의 난방성능 평가)

  • Jeong, Seon-Ok;Kim, Jin-Hee;Kim, Ji-Seong;Park, Se-Hyeon;Kim, Jun-Tae
    • Journal of the Korean Solar Energy Society
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    • v.32 no.6
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    • pp.113-119
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    • 2012
  • The heat from PV modules should be removed for better electrical performance, and can be converted into useful thermal energy. A photovoltaic-thermal(PVT) module is a combination of PV module with a solar thermal collector which forms one device that produce thermal energy as well as electricity. In many studies various water type PVT collectors have been proposed in effort to increase their electrical and thermal efficiency. The aim of this study is to evaluate the heating performance of heating system combined with PVT collectors that on integrated building roof. For this study, the BIPVT system of 1.5kWp was installed at the experimental house, and it was incorporated with its heating system. From the experimental results, the solar fraction of the heating system with BIPVT was 15%. It was also found that was analyzed that the heating energy for the house can be reduced by 47%, as the heat gained from BIPVT system pre-heated the water used for heating system.

The Production of High Functional Hot Mat with Sleeping Type (고기능성 침낭형 온수매트 제작)

  • Lee, Sang-Heon;Kang, Jung-Uk;Won, Woo-Yeon
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.28 no.6
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    • pp.400-402
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    • 2015
  • The typical winter heating unit heating mat. The product is to be found in the development of new water heating mat today. The product that circulates the water through the hose inside the mat with your existing heating mat electric heated mat is different from boiling water. However, no clear standards for noise and safety, consumer choice is giving confusing information about the product is low. We were to develop a high heat retention and stability than conventional sleeping mats to produce creative than traditional hot mats, heated mats general comparison with experimental results is a more efficient heat retention mat is produced.

Fabrication on Microheater Flow Sensors Using Membrane Structure and Its Characteristics (맴브레인 구조를 이용한 미세발열체형 유량센서의 제작과 그 특성)

  • 정귀상;노상수
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.11 no.11
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    • pp.996-1000
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    • 1998
  • This paper describes the characteristics of Pt microheater using aluminum oxide films as medium layer and its application to flow sensors. Pt microheater have heating temperature of $390^{\circ}C$ at heating power of 1.2 W. Output voltages of flow sensors which were fabricated by integrating sensing-part with heating-part increase as gas flow rate and its conductivity increase. At $O_2$ flow rate of 2000 sccm, heating power of 0.8 W, output voltage of flow sensor is 101 mV under bridge-applied voltage of 5 V.

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A Study on the Temperature-Diffusion Analysis of Induction Heating Jar (Induction Heating Jar의 온도분포 해석에 관한 연구)

  • Lee, Sang-Ho;Oh, Hong-Seok;Lee, Bong-Seob;Lee, Young-Mee
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.04a
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    • pp.79-82
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    • 2002
  • Induction heating is widely used in today's industry, in operations such as metal hardening, preheating for forging operations, melting or cooking. In this paper, it was presented the magneto-thermal analysis of an induction heating jar(IH-JAR) with the material value of the stainless and the aluminum for efficient design. The magnetic field intensity inside the axisymmetric shaped cooker was analyzed using three-dimensional axisymmetric finite element method(FEM) and the effectual heat source was obtained by ohmic losses from eddy currents induced in the jar. The heat was calculated using the heat source and heating equation. Also, it was represented the temperature characteristics of the IH-JAR according to time and relative permeability in stainless parts and in aluminum parts.

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Evaluation of the Influence of Pyrolysis Temperature on the Electrical Heating Properties of Si-O-C Fiber

  • Sanghun Kim;Seong-Gun Bae;Bum-Mo Koo;Dong-Geun Shin;Yeong-Geun Jeong
    • Composites Research
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    • v.37 no.4
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    • pp.330-336
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    • 2024
  • Silicon carbide (SiC) fibers exhibit excellent heat and chemical resistance at high temperatures. In this study, polycarbosilane melt spinning, oxidation curing, and pyrolysis were performed to fabricate amorphous SiC fibers, and their resistance heating characteristics were evaluated. A stick-type amorphous silicon carbide fiber heating element was manufactured, and the resistance was measured using the two-point probe method. The structural, electrical, and heating characteristics were evaluated at different pyrolysis temperatures. The fiber produced at 1300℃ displayed the highest conductivity and the maximum heating compared to the fibers produced at 1200℃ and 1400℃. This may be attributed to difference in the structures of the fibers, particularly the SiC and graphitic carbon structures.

Design of Control System for All-Metal Domestic Induction Heating Considering Temperature and Quick-Response (워킹코일 온도 및 제어 속응성을 고려한 All-Metal Domestic Induction Heating 제어 시스템 설계)

  • Park, Sang-Min;Jang, Eun-Su;Joo, Dong-Myoung;Lee, Byoung-Kuk
    • The Transactions of the Korean Institute of Power Electronics
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    • v.23 no.3
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    • pp.199-207
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    • 2018
  • In this paper, an all-metal domestic induction heating (IH) system that can quickly identify ferromagnetic and non-ferromagnetic pots considering temperature changes in the working coil is designed. Load modeling is performed after analyzing the parameters of the pot material and the central misalignment of the working coil. To improve the performance and stability of the all-metal IH cooking heater, a power curve-fitting model is used to design a control system that quickly responds to load parameter fluctuations. In addition, a power control algorithm is established to compensate for the reference value by reflecting the increase in working coil temperature during heating of the non-ferromagnetic pot. The validity of the proposed control algorithm for the all-metal IH is verified by experiments using a 3.2 kW all-metal IH cooking heater.

A Study on the Improvement of Subsidy Program for CHP Plant Connected with Capital Region District Heating System (수도권 지역난방연계 열병합발전소의 기반기금 지원과 개선방안)

  • 김창수;이창호
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.53 no.2
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    • pp.97-103
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    • 2004
  • CHP system supplies electricity and heating together with high efficiency. Current utility's CHP system uses electric power by itself and sells thermal energy to KDHC(Korea District Heating Corporation). CHP's operation cost except sales revenue of heating was covered by the sale revenue of electricity. Thus Electric generation cost in district Heating CHP system has close relationship with the level of heating price. However, after the restructuring of electricity industry, the operation cost could not be covered by sales revenue of heating and electricity. This loss was compensated by energy subsidy program in the electric power industry infrastructure fund. This paper suggests reasonable evaluation and improvement methods of the loss calculation of CHP system utilizing the infrastructure fund efficiency In terms of the direction of support by the fund, it provides the methods to prevent inefficient operation through setting up the upper limit of subsidy and to improve the loss calculation. Moreover, it suggest fixed rate support by heating supply level and reducing subsidy gradually for an efficient operation of CHP system.

Degradation of High Performance Short Channel N-type Poly-Si TFT under the Electrical Bias Caused by Self-Heating

  • Choi, Sung-Hwan;Song, In-Hyuk;Shin, Hee-Sun;Park, Sang-Geun;Han, Min-Koo
    • 한국정보디스플레이학회:학술대회논문집
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    • 2007.08b
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    • pp.1301-1304
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    • 2007
  • We have investigated degradation of short channel n-type poly-Si TFTs with LDD under high gate and drain voltage stress due to self-heating. We have found that the threshold voltage of short channel TFT is shifted to negative direction on the selfheating stress, whereas the threshold voltage of long channel is moved to positive direction.

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