• Title/Summary/Keyword: Low temperature heating

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Browning Reaction of Fresh Ginseng (Panax ginseng C.A. Meyer) as Affected by Heating Temperature (가열온도에 따른 수삼의 갈변반응 특성)

  • 이종원;이성계
    • Journal of Ginseng Research
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    • v.19 no.3
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    • pp.249-253
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    • 1995
  • In the browning reaction of Korean ginseng, it appears that enzymatic and non-enzymatic browning reaction occurred in the initial stage of heating fresh ginseng at low temperature, and then non-enzymatic browning reaction followed in the drying period after heating. Activation energy of the browning reaction for red ginseng was about 9.0 kcal/mol. Browning reaction of red ginseng was accede- rated with an increase in steaming time, and a great extent of browning reaction occurred between 60-90 min of steaming at 10$0^{\circ}C$. Browning pigments of red ginseng were mostly water soluble subset.

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Development of Induction Heating Apparatus for Rapid Heating of Metallic Mold (미세 임프린팅용 금속몰드의 급속가열을 위한 유도가열기구 개발)

  • Hong, S.K.;Lee, S.H.;Heo, Y.M.;Kang, J.J.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2007.05a
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    • pp.199-204
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    • 2007
  • Hot embossing, one of Nanoimprint Lithography(NIL) techniques, has been getting attention as an alternative candidate of next generation patterning technologies by the advantages of simplicity and low cost compared to conventional photolithographies. A typical hot embossing usually, however, takes more than ten minutes for one cycle of the process because of a long thermal cycling. Over the last few years a number of studies have been made to reduce the cycle time for hot embossing or similar patterning processes. The target of this research is to develop an induction heating apparatus for heating a metallic micro patterning mold at very high speed with the large-area uniformity of temperature distribution. It was found that a 0.5 mm-thick nickel mold can be heated from $25^{\circ}C$ to $150^{\circ}C$ within 1.5 seconds with the temperature variation of ${\pm}5^{\circ}C$ in 4-inch diameter area, using the induction heating apparatus.

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Surface Temperature Measurements in Microscale with Temperature Sensitive Fluorescence (온도 민감 형광을 이용한 마이크로 스케일 표면온도 측정)

  • Jung, Woon-Seop;Kim, Sung-Wook;Kim, Ho-Young;Yoo, Jung-Yul
    • Proceedings of the KSME Conference
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    • 2004.11a
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    • pp.1225-1230
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    • 2004
  • The effects of substrate material on the local heating performance of microheaters are studied by both numerical analysis and experiment. Transient conduction analysis shows that the substrate material with low thermal conductivity is critical to the local heating and fast response. A measurement technique for surface temperature field in microscale is newly proposed, which uses temperature sensitive fluorescent dye coated on the surface. The measured surface temperature fields on microheater arrays fabricated on different substrates are presented.

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Neutral Beam assisted Chemical Vapor Deposition at Low Temperature for n-type Doped nano-crystalline silicon Thin Film

  • Jang, Jin-Nyeong;Lee, Dong-Hyeok;So, Hyeon-Uk;Yu, Seok-Jae;Lee, Bong-Ju;Hong, Mun-Pyo
    • Proceedings of the Korean Vacuum Society Conference
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    • 2011.02a
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    • pp.52-52
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    • 2011
  • A novel deposition process for n-type nanocrystalline silicon (n-type nc-Si) thin films at room temperature has been developed by adopting the neutral beam assisted chemical vapor deposition (NBa-CVD). During formation of n-type nc-Si thin film by the NBa-CVD process with silicon reflector electrode at room temperature, the energetic particles could induce enhance doping efficiency and crystalline phase in polymorphous-Si thin films without additional heating on substrate; The dark conductivity and substrate temperature of P-doped polymorphous~nano crystalline silicon thin films increased with increasing the reflector bias. The NB energy heating substrate(but lower than $80^{\circ}C$ and increase doping efficiency. This low temperature processed doped nano-crystalline can address key problem in applications from flexible display backplane thin film transistor to flexible solar cell.

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Analysis of Unsteady Heat Transfer of Radiatively Heated Stacked Disks (복사가열되는 적층원판의 비정상 열전달해석)

  • 이주호;송태호;현재민
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.18 no.1
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    • pp.156-165
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    • 1994
  • Unsteady heat conduction in stacked disks in a furnace has been numerically solved The effects of relevant parameters such as disk spacing, aspect ratio, environmental temperature, Biot nember, etc. have been investigated. The highest temperature appears at the disk edge and the lowest at the center. Penetration of heat form the surface to the center requires some time. Heating should be slow for uniform temperature rise. Geometric parameters complicates the radiative and conductive heat transfer. Though the resulting dependence of temperature nonuniformity on various parameters is complicated, high uniformity of temperature is in general available by low Biot number and/or low environmental temperature.

Development of high-efficiency heating system using humidifying particles (가습 입자를 활용한 고효율 난방 시스템 개발)

  • Lee, Jeong-Won;Hong, Kyung-Bo
    • Design & Manufacturing
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    • v.14 no.4
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    • pp.17-24
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    • 2020
  • Products for heating indoors in low temperature and dry winter are largely divided into products using fossil fuels and products using electricity. The fossil fuels can warm the entire space by convection, but there is a high risk of fire and the frequent ventilation due to the increase in carbon monoxide and carbon dioxide. Heaters using electricity are mainly used because they are convenient to use and are cheap. However, these products can not efficiently warm the air because they use radiation energy. In other words, only the front part exposed to the heater is warm, and the rear part has no heating effect at all. Also, because it emits a large amount of light, fatigue of the eyes is very high. Another problem is that when using electric heaters, the room tends to be dry by high heat. Indoor humidity maintenance is a very important factor in the prevention and treatment of respiratory diseases. Especially, it is essential for health care for infants, bronchial organs and people with weak respiratory because humidity is low in winter. In this study, we conducted a study to develop a product that can improve heating efficiency while maintaining proper indoor humidity by combining heat energy and moisture particles. The concept of humidification and heating at the same time, moisture particles generated in the humidifier pass through the heater, include thermal energy, and the moisture particles with thermal energy are diffused into the space by forced convection, thereby warming the entire space. In addition, the heating time is shortened as the feeling temperature is increased with the high relative humidity, and this has the effect that the heating cost in winter is reduced.

A Study on the Characteristics of Heat Transfer in Quadrangle Duct with Solar Absorber Plate (태양열 집열면이 있는 4각 덕트 내의 열전달 특성에 관한 연구)

  • 고동국;조대진;윤석주;박상규
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.14 no.12
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    • pp.1014-1022
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    • 2002
  • This paper analyzed the characteristics of heat transfer in quadangle duct with absorber plate by solar radiation. Effects o( Reynolds number on increasing temperature at outlet for variation of absorber plate temperature were analyzed by using numerical analysis technique. And also the effects of turbulent intensity of inlet flow on increasing temperature at outlet for various duct height and effects of inlet aspect ratio of quadrangle duct and position of heating surface on the outlet temperature were analysed. As the results, Outlet temperature was greatly influenced in low Reynolds number. And the highest outlet temperature distribution appeared on the inlet aspect ratio 2 because of the buoyancy effect.

Study on the Operating Characteristics with Load Condition in Hybrid Solar Heating System during Spring Season (봄철 태양열 하이브리드 시스템의 부하조건 변화에 따른 운전특성 연구)

  • Pyo, Jong-Hyun;Kim, Won-Seok;Cho, Hong-Hyun;Ryu, Nam-Jin
    • Proceedings of the SAREK Conference
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    • 2009.06a
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    • pp.1418-1423
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    • 2009
  • This study describes experimental study on the performance characteristics with load condition in hybrid solar heating system during spring season. The room temperatures, the hot water conditions and the lower part temperatures of heat storage tank were changed to analyze the system performances. As a results, the hot water was significantly affected by the ambient temperature. The indoor setting temperature affected the solar fraction. When the low part temperature of the storage tank increased, the temperature of the hot water rose and the temperature of the hot water in morning was affected by the ambient temperature.

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Effects of Induction Heating Conditions on Ni-Al Based Intermetallic Compound Coating (Ni-Al계 금속간화합물 코팅에 미치는 고주파유도 가열 조건의 영향)

  • Lee, Han-Young;Kim, Tae-Jun;Cho, Yong-Jae
    • Korean Journal of Metals and Materials
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    • v.48 no.2
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    • pp.141-147
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    • 2010
  • An Ni-Al intermetallic coating has been produced by induction heating on mild steel. The effect of the induction heating conditions on the microstructure of the coating has been investigated. The reaction synthesis of the intermetallic compounds was promoted while increasing the heating rate and the holding time at reaction temperature. Especially, an NiAl phase corresponding to the initial composition of mixed powder was predominantly formed. However, the synthesis at low reaction temperatures occurred by solid state diffusion during the holding time and an Fe-Al reaction layer was formed at the interface with the substrate, regardless of the heating rate. The combustion synthesis of the intermetallic compound occurred at a temperature higher than 1023 K and resulted in an almost single phase NiAl structure.

Development of a Low-power Walk-way for Anti-Icing (결빙 방지를 위한 저전력 갑판이동로 개발)

  • Bae, Sang-Eun;Cho, Su-gil;Lee, Woon-Seek
    • Journal of the Korean Society of Industry Convergence
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    • v.22 no.3
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    • pp.353-364
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    • 2019
  • The walk-way means a passage installed on the deck of a ship so that a person can safely move under any circumstances. So, the walk-way has to maintain a temperature of $5^{\circ}C$ or more for anti/de-icing even at an ambient temperature of $-62^{\circ}C$, a temperature in polar region. At present, the walk-way with heating cable is used, but the anti/de-icing effect is insufficient due to low heat transfer efficiency. Also, it has a construction problem due to heavy weight. In this study, an walk-way with a CNT surface heating element is proposed for the high anti/de-icing effect and the heating value per unit volume. The international standard survey, conceptual design, and simulation for the structural safety and the heat transfer are performed for the development of the proposed walk-way. To enhance the performance, the case studies based on the simulation analysis are conducted. Finally, the final prototype, applying the optimum material and thickness (3.2t of SS400) based on the case study results, is fabricated and experimented.