• Title/Summary/Keyword: Hot air heater

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Experimental Study for Estimation of Air Heating Performance and Improvement of Thermal Performance of Hybrid Solar Air-water Heater (태양열 공기-물 가열기의 공기 가열 성능 평가 및 열적 성능 개선을 위한 실험적 연구)

  • Choi, Hwi-Ung;Kim, Young-Bok;Yoon, Jung-In;Son, Chang-Hyo;Choi, Kwang-Hwan
    • Journal of the Korean Solar Energy Society
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    • v.37 no.1
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    • pp.47-57
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    • 2017
  • Solar energy is one of the important renewable energy resources. It can be used for air heating, hot water supply, heat source of desiccant cooling system and so on. And many researches for enhancing efficiency have been conducted because of these various uses of solar thermal energy. This study was performed to investigate the air heating performance of hybrid solar air-water heater that can heat air and liquid respectively or simultaneously and finding method for improving thermal performance of this collector. This collector has both liquid pipe and air channel different with the traditional solar water and air heater. Fins were installed in the air channel for enhancing the air heating performance of collector. Also air inlet & outlet temperature, ambient temperature and solar collector's inner part temperature were confirmed with different air velocity on similar solar irradiance. As a result, temperature of heated air was shown about $43^{\circ}C$ to $60^{\circ}C$ on the $30^{\circ}C$ of ambient temperature and thermal efficiency of solar collector was shown 28% to 73% with respect to air velocity. Also, possibility of improvement of thermal performance of this collector could be ascertained from the heat transfer coefficient calculated from this experiment. Thus, it is considered that the research for finding optimal structure of hybrid solar air-water heater for enhancing thermal performance might be needed to conduct as further study based on the method for improving air heating performance confirmed in this study.

A Study on Explosion Risk Management for Hot Oil Heater (열매체 가열기 설비에서의 폭발위험관리에 관한 연구)

  • Jang, Chul;Kwon, Jin-Wook;Hwang, Myoung-Hwan
    • Journal of the Korea Safety Management & Science
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    • v.19 no.3
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    • pp.1-9
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    • 2017
  • In the industrial field, various type of fuel have been used for product processing facilities. Recent for 10 years, the usage of natural gas (NG) was gradually increased. Because it has many merits; clean fuel, no transportation, storage facility and so on. There are common safety concept that strict explosion protection approaches are needed for facilities where explosive materials such as flammable liquid, vapor and gases exist. But some has an optimistic point of view that the lighter than air gases such as NG disperse rapidly, hence do not form explosion environment upon release into the atmosphere, many parts has a conventional safety point of view that those gases are also inflammable gases, hence can form explosion environment although the extent is limited and present. In this paper, the heating equipments (Hot Oil Heater) was reviewed and some risk management measures were proposed. These measures include hazardous area classification and explosion-proof provisions of electric apparatus, an early gas leak detection and isolation, ventilation system reliability, emergency response plan and training and so on. This study calculates Hazardous Area Classification using the hypothetical volume in the KS C IEC code.

Development of Low NOx Gas Burner Absorption Chiller/Heater Unit (흡수식 냉온수기용 저 NOx 가스버너 개발)

  • 최정환;오신규
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.19 no.1
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    • pp.277-283
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    • 1995
  • For the development of low NO$_{x}$ gas burners aimed for absorption chiller/heater unit, three proto type burners of different capacity (265000, 498000, and 664000 kcal/h) have been manufactured through a combustion method of step-by-step air injection. In order to characterize the overall features of the flame and the properties of the emission gas, the temperature of the flame and the concentration of NO$_{x}$ and CO were determined. The main factors in the design of burners (the area of primary air injection, the diameter of secondary air injection hole, fuel nozzle diameter) were observed to increase linearly with the scale-up of burner capacity. The flame temperature profiles of the burners were observed to be almost similar, irrespective of their capacity. However, as their capacity increased, the flame temperature slightly increased and the hot region of the flames moved to ward the flame tip along with the expansion to the direction of radius. From the proto type units, the amount of their NO$_{x}$ emission was determined to be around 25 - 30 vppm(3% )$_{2}$) and the CO emission was less than 19 vppm (3% $O_{2}$).TEX>).

An Experimental Study on the Characteristic of the Hot Water-Air Heating Generating System with a Solar Collector

  • Rokhman, Fatkhur;Hong, Boo-Pyo;You, Jin-Kwang;Yoon, Jung-In;Choi, Kwang-Hwan
    • 한국태양에너지학회:학술대회논문집
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    • 2012.03a
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    • pp.360-363
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    • 2012
  • A solar air heating has low efficiency compared with the solar water heating because the heat capacity of the air is small. The heat received by solar collector plate is not fully transferred to the air and then a part of them became the losses to the environment through conduction and convection process. This research is focusing on a design of better combined multi-purposed system suggested by us and aims to secure the more efficient solar energy utilization by combining the hot water and air heating system. The result in this paper has shown that the proposed design has better thermal performance than that of the common design. Furthermore, it was found that the performance of the combined air - water heating system increases the efficiency from 30% to 35%-40%.

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Novel Electromagnetic Induction Eddy Current DPH based Continuous Pipeline Fluid Heating using Soft Switching PWM High Frequency Inverter

  • Nam, Jing-Rak
    • Journal of information and communication convergence engineering
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    • v.6 no.3
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    • pp.305-309
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    • 2008
  • This paper presents an innovative prototype of a new conceptual electromagnetic induction eddy current based fluid heating appliance using voltage-fed quasi resonant zero voltage soft switching PWM high-frequency inverter using IGBTs, which can operate at a constant frequency variable power regulation scheme. The promising simple high efficient low noise inverter type electromagnetic induction eddy current based pipeline fluid heating appliance is proposed for saturated steam generator, superheated steam generator, hot water and hot air producer, metal catalyst heating for exhaust gas cleaning in engine. Under these technological backgrounds, a novel electromagnetic induction eddy current Dual Packs Heater(DPH) based pipeline fluid heating incorporates thin metal layer type package for continuous fluid heating appliances applying two types of voltage-fed quasi load resonant ZVS-PWM high frequency inverter. The unique features of a novel electromagnetic induction eddy current DPH based continuous pipeline fluid heating appliance is illustrated on the basis of simulation and discussed for the steady state operating characteristics and experimental results.

Underground hot water heating system development using exhaust gas heat in the hot air heater (온풍난방기의 배기열을 이용한 지중난방용 온수시스템 개발)

  • 김영중;이건중;신정웅;유영선;장진택
    • Proceedings of the Korean Society for Bio-Environment Control Conference
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    • 1999.11a
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    • pp.100-103
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    • 1999
  • 온풍난방은 우리 나라 대부분의 온실난방지역에서 가장 많이 채택하고 있는 온실난방방법으로 간주되고 있다. 온풍난방은 기본적으로 화석연료를 연소열로 변환시켜 온실난방에 사용하는 방법으로 온수난방, 태양열난방 보다 열효율이 높다. 가장 보편적 온실난방열원으로는 경유나 보일러등유를 연소실에서 연소하여 열교환기를 거친 후 온풍기의 상부에 부착되어 있는 송풍팬으로 강제적으로 온실 내로 온풍을 불어넣는다. (중략)

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Research on the Thermal Comfort Heating Mode Considering Psychological and Physiological Response of Automobile Drivers (운전자의 심리·생리 반응을 고려한 승용차 쾌적 난방 모드에 관한 연구)

  • Kim, Min Soo;Kum, Jong Soo;Park, Jong Il;Kim, Dong Gyu
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.30 no.3
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    • pp.149-157
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    • 2018
  • In this research, the psychological and physiological reactions of the driver were measured during winter to evaluate thermal comfort. The experiment was conducted using 3 different cases which are hot air heating, warm-wire seat heating and hot air & warm-wire seat heater operating simultaneously. With regard to psychological reaction, the warm-wire heating mode was the most preferred. The reason is that it is dry in other cases. With regard to EEG response, thermal comfort increased by 37% in warm air mode heating. In addition, when the warm-wire heating mode and the hot air & warm-wire heating mode were simultaneously operated, the thermal comfort continuously increased by between 17% and 20% for 20 minutes after boarding. Under the change of the autonomic nervous system, the thermal stress level increased by 23% after 15 minutes on board in the hot air heating mode and decreased continuously by 13% during the warm-wire seat heating mode. We recommended the hot air heating mode is only used for a short time to raise the inside temperature during the early boarding period and that warm-wire seat heating mode be actively utilized.

Performance Evaluation of Hybrid Solar Air-Water Heater when the Heated Air is used as Inlet Air during Air and Water is Heated Simultaneously (가열 공기 유입에 따른 복합형 태양열 가열기 공기-물 제조 성능에 관한 연구)

  • Choi, Hwi-Ung;Yoon, Jung-In;Son, Chang-Hyo;Choi, Kwang-Hwan
    • Journal of the Korean Solar Energy Society
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    • v.35 no.5
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    • pp.21-29
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    • 2015
  • In this study, the performance of hybrid solar air-water heater when the heated air was used as inlet air was investigated during air and liquid were heated simultaneously. Temperature difference between inlet air and ambient was set as $0^{\circ}C$, $13^{\circ}C$ and $22^{\circ}C$ and it was maintained during the daily operation. As a result, thermal efficiency of liquid heating was increased when the inlet air temperature was increased and heat gain of the water in heat storage tank was also increased with increment of temperature difference between inlet air and ambient temperature. On the contrary to this, the decrement of air heating efficiency and total efficiency of collector was confirmed with increment of inlet air temperature and it is considered that heat gain of liquid side is lower than heat loss of air side that occurring by using heated air as inlet air of collector. So, from these results, maximum temperature that the liquid in heat storage tank can reach was expected to increase if the return air or any heated air was used as inlet air. But air and total efficiency of hybrid solar air-water is decreased, so using outdoor air as inlet air is considered as better way on perspective of using of solar thermal energy by hybrid solar collector. However, it is hard to conclude that using outdoor air is better than heated air on the perspective of energy saving of building because the performance of heat storage performance was increased even air and total thermal efficiency was decreased, so the necessity of more profound consideration about these result in further research was confirmed for putting the hybrid solar air-water heater to practical use.