• 제목/요약/키워드: Storage heat flux

검색결과 67건 처리시간 0.06초

A Study on the Fire Impact of Adjacent Storage at Outdoor Storage Fire (옥외저장소 화재 시 인접 저장소 화재 영향에 대한 연구)

  • Eun-Ji Kim;Sung-Seek Park;Yong-Han Jeon
    • Journal of the Korea Safety Management & Science
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    • 제26권3호
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    • pp.93-100
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    • 2024
  • Outdoor storage fires have a significant impact on the surrounding environment, including adjacent storage facilities and buildings. Therefore, it is essential to review and manage the fire impact to minimize damage to human life and property on the outdoor storage fires. In this study, the heat release rate and radiant heat flux were simulated according to the fire time, wind veolcity, and presence or absence of water spray equipment in an outdoor storage facility fire, and the fire impact was analyzed. The outdoor storage was designed to simulate two scenarios on the outdoor storage fires containing gasoline, and FDS was used for fire simulation. As a results, when the water spray facility was not operating and the wind velocity was 5 m/s, the maximum radiant heat flux was 24.80 kW/m2, which exceeded the limit radiant heat flux of 20 kW/m2. When the water spray facility was operating and the wind veolcity was 10 m/s, the maximum radiant heat flux was 18.77 kW/m2, which did not exceed the limit radiant heat flux, indicating that the fire impact on adjacent storage facilities was relatively small.

Performance Comparison of an Urban Canopy Model under Different Meteorological Conditions (기상 조건에 따른 도시 캐노피 모형의 성능 비교)

  • Ryu, Young-Hee;Baik, Jong-Jin;Lee, Sang-Hyun
    • Atmosphere
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    • 제22권4호
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    • pp.429-436
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    • 2012
  • The performances of the Seoul National University Urban Canopy Model (SNUUCM) under different meteorological conditions (clear, cloudy, and rainy conditions) in summertime are compared using observation dataset obtained at an urban site. The daily-averaged net radiation, sensible heat flux, and storage heat flux are largest in clear days and smallest in rainy days, but the daily-averaged latent heat flux is similar among clear, cloudy, and rainy days. That is, the ratio of latent heat flux to net radiation increases in order of clear, cloudy, and rainy conditions. In general, the performance of the SNUUCM is better in clear days than in cloudy or rainy days. However, the performance in simulating sensible heat flux in clear days is as poor as that in rainy days. For all the meteorological conditions, the performance in simulating latent heat flux is worst among the performances in simulating net radiation, sensible heat flux, and latent heat flux. The normalized mean error for latent heat flux is largest in rainy days in which the relative importance of latent heat flux in the surface energy balance becomes greatest among the three conditions. This study suggests that improvements to the parameterization of processes that are related to latent heat flux are particularly needed.

Experimental Study of Radiation Heat Flux for the Pool and Spill Fire in Petroleum Storage Tanks (석유류 저장 탱크에서의 액면 및 유츌화재에 대한 복사열의 실험적 연구)

  • Kim, Hong;Park, Hyung-Ju
    • Journal of the Korean Society of Safety
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    • 제19권1호
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    • pp.88-93
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    • 2004
  • This experimental study was carried out to evaluate effect of the radiation heat flux for the pool and spill fire in petroleum storage tanks, which were made form steel. Each of them had the capacity of 250, 2500 and 25000 liter, respectively. The effects of the radiation heat flux are as follows; 1) The intensity of radiation heat flux from a flame decreased exponentially with increasing distance from outside wall of tanks, and increased significantly with surface area of tank and dyke. 2) In the case of 25000L tank, the radiation heat flux was about max. 98.9kW/$m^2$ in 1m from wall of tank. 3) The distance, that was able to ignite wood or plastics by radiation heat flux of approximately 12.5kW/$m^2$, was about 3.14m from wall of 25000L tank.

The Seasonal Variation of the Heat Budget in Deukryang Bay (득량만의 열수지 계절 변동)

  • 주용환;조규대
    • Journal of Environmental Science International
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    • 제7권1호
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    • pp.67-73
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    • 1998
  • Surface heat budget of the Deukryang Bay from July 1, 1992 to September 12, 1993 is analyzed by us- ing the meteorological data (by Changhung Observatory and Mokpo Meteorological Station) and oceanogaphical data (by Research Center for Ocean Industrial Development. Pukyong National University). Each flux element at the sea surface which has annual variation Is derived with application of an aerodynamical bulk method and empirical formulae. The solar radiation Is the maximum In spring and sensible heat are the maximum in autumn and water. and minimum in summer The heat .storage rate is calclilated by using the rate of water temperature variation according to the depth. The oceanic transport heat is estimated as a residual. The net heat flux, the heat storage rate are positive In spring and summer, while they are negative in autumn and winter. The oceanic transport heat Is convergence In winter and divergence In the rest of seasons.

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Daily Variation of Heat Budget Balance in the Gangjeong-Goryung Reservoir for Summertime - Concerning around the Rate of Heat Storage - (낙동강 강정고령보의 여름철 열수지 일변화 - 열 저장량 변동을 중심으로 -)

  • Kim, Seong-Rak;Cho, Chang-Bum;Kim, Hae-Dong
    • Journal of Environmental Science International
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    • 제24권6호
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    • pp.721-729
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    • 2015
  • Surface heat balance of the Gangjeong-Goryung Reservoir is analyzed for 12-17 August 2013. Each flux elements at the water surface is derived from the special field observations with application of an aerodynamical bulk method for the turbulent heat fluxes and empirical formulae for the radiation heat fluxes. The rate of heat storage in the reservoir is estimated by using estimated by surface heating rate and the vertical water temperature data. The flux divergence of heat transport is estimated as a residual. The features of the surface heat balance are almost decided by the latent heat flux and the solar radiation flux. On average for 12-17 August 2014 in the Gangjeong- Goryung Reservoir, if one defines the insolation at the water surface as 100 %, 94 % is absorbed in the reservoir; thereafter the reservoir loses about 30~50% by sensible heat, latent heat and net long-wave radiation. The residue of 50~80 % raises the water temperature in the reservoir or transported away by the river flow during the daytime.

A study on the fire impact of Pentane outdoor storage tank (Pentane 옥외저장탱크의 화재 영향 검토에 대한 연구)

  • Eun-Ji Kim;Sung-Seek Park;Yong-Han Jeon
    • Design & Manufacturing
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    • 제18권3호
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    • pp.64-70
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    • 2024
  • Fire prediction, response and assessment for outdoor storage tanks are essential to disaster management because they have significant human, social and environmental impacts. Therefore, in this study, the fire situation an outdoor storage tank was simulated and the effects of fire on the radiant heat flux were analyzed concerning tank height and fire occurrence time. tank height and fire occurrence time. For this purpose, fire scenarios and specifications of the outdoor storage tank were set, and a study was carried out considered height, fire occurrence time and the operating or non-operating of a water spray system in outdoor storage tanks containing large amounts of Pentane using FDS (Fire Dynamics Simulator). As a results, the radiant heat flux was reduced by more than 50% depending on whether the water spray system was m operating or not. When the water spray system was in operation, the maximum radiant heat flux was 13.75 kW/m2 at a tank height of 14 m, and when the water spray system was not 117 operation, the maximum radiant heat flux was 25.14 kW/m2 at the same tank height. Additionally, it was found that when the water spray system was in operation, the radiant heat flux was 50% lower than when the water spray system was not in operation.

Surface Heat Budget of the Northern Sea of Cheju Island for June-August 1993 and 1994 (제주도 북부해역의 표면 열수지 해석 -1993년과 1994년 하계의 경우-)

  • 김해동;양성기
    • Journal of Environmental Science International
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    • 제4권3호
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    • pp.197-206
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    • 1995
  • Surface heat balance of the northern sea of Cheju Island for summer in 1993 and 1994 is analyzed using the observation data obtained by Marine Research Institute, Cheju National University. Each flux elements at the sea surface is derived from the marine meteorological reports with application of an aerodynamical bulk method for the turbulent heat fluxes, and empirical formulae for the long-wave radiation heat fluxes. The flux divergence of oceanic heat transport and the rate of heat storage in the ocean are estimated as residual. The features of the surface heat balance are mainly decided by the solar radiation flux and the latent heat flux for 199B. But the Bowen Ratios were large for 1993. This means that the sensible heat fluxes were nearly equal to the latent heat fluxes for 1993. In this period, mean flux divergence of oceanic heat transport is about 130 W/$m^2$.

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Effective thermal conductivity of the phase change material with metal scrap (금속스크랩이 혼합된 상변화물질의 유효열전도율)

  • 김시범;노승탁
    • Transactions of the Korean Society of Mechanical Engineers
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    • 제10권6호
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    • pp.923-928
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    • 1986
  • A set of measurements has been made for the thermal conductivity of the pure paraffin in liquid and solid phases and for the effective thermal conductivity of the paraffin with metal scrap with the aid of the heat flux meter. Ther thermopile-type heat flux meter has been designed by steady state method and the functional relation between the temperature difference of both sides and heat flux has been obtained. The measured values of thermal conductivity are compared with the existing data for the pure paraffin and with the predicated values from the suggested model in which only one empirical constant is contained. The comparison within ten percent of the volume fraction of the metal scrap in the paraffin is satisfactory.

A Study of Application on the Pulsating Heat Pipe for Heat Transfer Enhancement of Metal Hydride Alloy (수소 저장합금층의 열전달 촉진을 위한 진동형 히트 파이프 적용에 관한 연구)

  • Lee, Min-Jae;Im, Yong-Bin;Bae, Sang-Chul;Kim, Jong-Soo
    • Proceedings of the SAREK Conference
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    • 대한설비공학회 2006년도 하계학술발표대회 논문집
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    • pp.346-351
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    • 2006
  • When metallic alloys are reacted to hydrogen, heat transfer of storage tank effects hydrogen storage rate and capacity. If pulsating heat pipe are used to improve heat transfer efficiency, production of hydrogen storage tank can be more simple and economical. Experiment of heat pipe was conducted by varying working fluids and heat flux. According to supply heat flux, test indicate that R-22 and R-l42b were found lower temperature difference between evaporator and condenser than R-134a and Ethanol. Thermal resistances of R-22 and R-142b were also lower than others. Using R-142b as a working fluid, heat pipe type hydrogen storage tank is tested in absorption and desorption processes.

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Numerical study on Comparison of Self-Pressurization Behavior of Liquid Nitrogen Cryostat for Umbilical Cord Blood Storage System Design

  • Mahfud, M.I.;Phil, K.E.
    • 한국태양에너지학회:학술대회논문집
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    • 한국태양에너지학회 2009년도 추계학술발표대회 논문집
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    • pp.409-414
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    • 2009
  • Since cryogens are stored at very low temperatures, the cryogenic storage systems are quite sensitive to heat leaks. Even though the vessel operated under sealed condition with vacuum insulation and reflective coatings are used, the heat leakage into the vessel is still unavoidable. Therefore, this paper concerns with numerical study of self-pressurization used to analysis the optimum design with the variation volume fraction, effect of heat flux and storage pressure of liquid nitrogen. The result shows that as the volume fraction increases, the pressure rise reduces and the relatively at atmosphere pressure is better than the higher one. In addition, higher heat flux leads the pressure rise increases faster than low one. The additional of heat pipe system to reduce the pressure rise rate also has been done. By this comparison, the optimum design for storage umbilical cord blood can be selected.

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