• Title/Summary/Keyword: 에너지전환

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What determines the Electricity Price Volatility in Korea? (전력계통한계가격 변동성 결정요인 분석: 베이지안 변수선택 방법)

  • Lee, Seojin;Kim, Young Min
    • Environmental and Resource Economics Review
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    • v.31 no.3
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    • pp.393-417
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    • 2022
  • Using hourly SMP data from 2016 to 2020, this paper measures the weekly realized volatility and investigates the main force of its determinants. To this end, we extend the Bayesian variable selection by incorporating the regime-switching model which identifies important variables among a large number of predictors by regimes. We find that the increase in coal and nuclear generation, as well as solar power, reinforce the SMP volatility in both high volatility and low volatility regime. In contrast the increase in gas generation and gas price decrease SMP volatility when SMP volatility is high. These results suggest that the expansion of renewable energy according to 2050 Carbon Neutrality or energy transition policies increases SMP volatility but the increase in the gas generation or reduction of coal generation might offset its impact.

Ti02/CNT Hybrid Nanofiber Electrode for Energy Conversion Devices (에너지 전환 소자용 $TiO_{2}/CNT$ 하이브리드 나노 섬유 전극)

  • Seo, Jae-Sub;Kim, Joo-Yong;Jin, Hyoung-Joon;Kang, Min-Sung
    • 한국신재생에너지학회:학술대회논문집
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    • 2007.06a
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    • pp.323-325
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    • 2007
  • $TiO_{2}$ electrode electrospun directly onto the substrate was developed for energy conversion device. To enhance energy conversion efficiency of dye-sensitized solar cell, electrodes should have higher surface area to absorb more dyes and higher conductivity to reduce recombination of generated electrons. $TiO_{2}$ nanofibers with higher surface areas were fabricated by annealing electrospun $TiO_{2}/PVP$ nanofibers at $500^{\circ}C$ for 3 hrs in air. it was revealed that $TiO_{2}$ nanofiber electrodes is hybrid with MWNT showed higher conductivity than $TiO_{2}$ semiconductor electrode possibly due to band gap change.

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A Study on the Catalytic Ortho-Para Hydrogen Conversion in the Cryogenic Heat Exchanger Filled with Catalysts for Hydrogen Liquefaction (수소액화용 극저온 열교환기 내 촉매 수소 전환반응에 관한 연구)

  • SOHN, SANGHO;YOON, SEOK HO
    • Journal of Hydrogen and New Energy
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    • v.32 no.3
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    • pp.180-188
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    • 2021
  • This paper conducted a study on the ortho-para hydrogen conversion in the cryogenic heat exchanger filled with catalysts for hydrogen liquefaction by utilizing the numerical model of plate-fin heat exchanger considering catalytic reaction of ortho-para hydrogen conversion, heat and mass transfer phenomena and fluid dynamics in a porous medium. Various numerical analyzes were performed to investigate the characteristics of ortho-para hydrogen conversion, the effects of space velocity and activated catalyst performance.

A Study of Economic Efficiency and Environmental Performance Due to the Conversion of the 7th and 8th Basic Plan for Long-term Power Supply and Demand (제7차 및 제8차 전력수급기본계획 전원 구성 전환에 따른 경제성 및 환경성 변화 분석 연구)

  • Cho, Sungjin;Yoon, Teayeon;Kim, Yoon Kyung
    • Environmental and Resource Economics Review
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    • v.28 no.2
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    • pp.201-229
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    • 2019
  • This paper estimates the effects of generation mix changes in the $7^{th}$ and $8^{th}$ Basic Plan for Long-term Power Supply and Demand from two aspects: economic efficiency through electricity prices and environmental performance through $CO_2$ and air pollutants(NOx, SOx, PM) emissions. Particularly, we examined additional generation mix conversion paths that take into account the trade-off between economic efficiency and environmental performance through scenario analysis. According to our results, the conversion from the $7^{th}$ plan to the $8^{th}$ plan should increase the electricity prices in the mid- and long-term, while reducing GHG and air pollutants emissions at the same time. The alternative generation mix that combines $7^{th}$ and $8^{th}$ plans shows that there exists a path to mitigate the trade-off between economic and environmental in the long-term. It will be next to impossible to derive a optimal generation mix that simultaneously considers the core values, such as supply stability, environmental performance, economic efficiency, energy safety and energy security, when establishing the power supply and demand plan. However, by exploring the effects of various generation mix paths and suggesting near-optimal paths, people can best choose their direction after weighhing all the paths when deciding on a forward-looking generation mix in the long term.