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표준강수증발산량지수를 이용한 북한지역 과거와 미래 가뭄 평가
김진혁(Jin Hyuck Kim),이석호(Suk Ho Lee),김병식(Byung Sik Kim) 위기관리 이론과 실천 2018 Crisisonomy Vol.14 No.2
기존의 가뭄분석 연구는 강수량만을 사용하는 표준강우지수(SPI)를 이용한다. 하지만 표준강우지수 (SPI)는 가뭄분석에 있어서 가뭄 인자를 강수만을 고려하기 때문에 기후변동성으로 인한 강수, 증발 산량 등의 물 수지를 고려하지 못한다는 한계성이 있다. 따라서 본 연구에서는 가뭄분석에 있어서 강수뿐만이 아닌 증발산량을 고려할 수 있는 표준강수증발산량지수(SPEI)를 사용하여 북한지역의 가뭄을 분석하고자 하였다. 분석을 위해 1981년부터 2016년까지의 기상 관측치를 사용하여 현재 북한 가뭄분석을 통해 표준강수 증발산량 지수의 적합성을 확인하였으며, IPCC AR5의 RCP기후변화 시나리오 중 가장 기후변화에 극심한 영향을 받는 RCP8.5 시나리오를 통해 모의된 미래강수및 기온자료(2011~2100년)을 이용하여 기후변화 시나리오에 따른 미래 가뭄을 분석하였다. 분석결과 미래로 갈수록 강수량이 증가하나, 기온 상승으로 인한 증발산의 증가로 인해 가뭄의 심도가 증가되는 것을 확인할 수 있다. Due to recent climate change, rising temperatures and changes in rainfall patterns have increased the number of countries suffering from droughts and floods - water disasters - worldwide. The conventional drought analysis is based on the Standard Precipitation Index (SPI), which only reflects the amount of precipitation. However, the limitation of the Standard Precipitation Index is that it takes precipitation as an exclusive factor for drought analysis and does not provide a full representation of water balance such as precipitation and evapotranspiration, which are often influenced by climate variability. Therefore, the study used the Standardized Precipitation Evapotranspiration Index (SPEI) incorporating both rainfall and evapotranspiration in application for drought analysis in North Korea. The analysis result showed that drought would intensify in the years ahead due to rise in temperature and increased evapotranspiration in spite of increased precipitation.
열교환기를 사용한 냉각/재가열 장치의 에너지 절감에 관한 연구
김진혁(Jin-Hyuck Kim),유성연(Seong-Yeon Yoo),최양규(Yang-Kyu Choi) 대한설비공학회 2010 설비공학 논문집 Vol.22 No.7
In conventional air-handling units, when the circulated air from the air-conditioned space pass through the cooling coil, the air is over-cooled to eliminate the moisture as well as to decrease the temperature. The purpose of this study is to estimate the thermal performance and energy saving of the cooling/reheating system using heat exchanger which can save both cooling energy and reheating energy by exchanging heat between the cooled air and reheated air. The energy balance equations to estimate the state of the air for each components were provided and the heat transfer rates and the energy saving rates for the system were calculated from the equations. The results showed that the energy saving was up to 40% under present conditions, and saving rates were significantly affected by the air velocity, inlet conditions and the effectiveness of heat exchanger.
김진혁(Jin-Hyuck Kim),유성연(Seong-Yeon Yoo),김재성(Jae-Seong Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
When the circulated air from the air-conditioned space pass through the cooling coil in the air-conditioning system, the air is over-cooled to eliminate the moisture as well as to decrease the temperature. And the cooled air is reheated to recover the temperature. The purpose of this study is to estimate performance of the cooling/reheating system which can save both cooling energy and reheating energy by exchanging heat between the cooled air and reheated air. The thermal and dehumidification behaviors of the system are analysed. The results show that the energy saving decreases with increasing velocity.
마이크로 채널 PCHE의 압력손실 및 열전달 특성에 관한 연구
김진혁(Jin-Hyuck Kim),백승환(Seungwhan Baek),정상권(Sangkwon Jeong) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
A newly developed PCHE (Printed Circuit Heat Exchanger), which has a longitudinal corrugation flow channel, was fabricated using etching and diffusion bonding to evaluate its hydraulic performance. The purpose of this research is to examine the thermal and hydraulic performance of the PCHE in cryogenic temperature region. The test has been conducted with helium gas test apparatus under cryogenic temperature. The pressure drop and ineffectiveness calculated from the measured pressures and temperatures are discussed. The thermal performance is predominantly affected by the axial conduction heat transfer at lower Reynolds number range. The simple performance calculation model is presented and the ineffectiveness calculated from the model is compared with the experimental data.