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김별,황광일 한국마린엔지니어링학회 2023 한국마린엔지니어링학회지 Vol.47 No.6
Hydrogen leaks in enclosed areas, such as hydrogen fuel storage rooms, can lead to fire and explosion accidents. Recognizing these potential hazards, the Ministry of Oceans and Fisheries introduced the "Provisional Standards for Hydrogen Fuel Cell Facilities on Ships,” which requires the number and location of gas detectors inside the fuel cell area of a ship to be determined through computer analysis or physical diffusion tests. However, the application of hydrogen leakage tests in actual ships has economic and safety limita-tions. Moreover, previous studies have faced challenges in validating numerical simulations that consider ship motion. Therefore, this study aims to develop and validate a computational fluid dynamics (CFD) model based on previous experiments regarding the effects of ship motion on hydrogen dispersion. After comparing the experimental and numerical results for all scenarios, the hydrogen con-centration predictions were found to be similar, with a difference within 15%. The significance of this study lies in offering a more practical and economical method for determining the optimal location of hydrogen gas detectors in a real ship environment.
김별,임정수,조성백,황옥화,양승학,Kim, Byul,Lim, Joung-Soo,Cho, Sung-Back,Hwang, Ok-Hwa,Yang, Seung-Hak 한국축산환경학회 2014 한국축산시설환경학회지 Vol.20 No.2
The climate of the earth is expected to change rapidly and continuously. Despite climate change is expected to impact on productivity of crop and livestock, a study for adaptation and impact of livestock to global warming is not enough. This study was performed to develop a method to evaluate the effects of heat stress on dairy cattle. Feedlot environment and health status of livestock were measured through an infrared thermography camera and a temperature-humidity sensor. Environmental factors such as temperature and humidity were measured to calculate the Temperature humidity index (THI). The change of the milk yield was similar to THI data pattern, suggesting that THI might play an important role to predict the effect of climate change on dairy cattle. THI data would be useful to predict long-term climate change effects on dairy cattle with RCP8.5 scenario.